JP2012131018A - Method of manufacturing super hard alloy baseplate outer circumference cutting blade - Google Patents
Method of manufacturing super hard alloy baseplate outer circumference cutting blade Download PDFInfo
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Abstract
Description
本発明は、希土類焼結磁石の切断に好適な超硬合金台板外周切断刃の製造方法に関する。 The present invention relates to a method of manufacturing a cemented carbide base plate outer peripheral cutting blade suitable for cutting rare earth sintered magnets.
希土類永久磁石(焼結磁石)の切断加工には、内周切断やワイヤーソー切断など各種の手法が実施されている。このなかで、外周刃による切断加工は最も広く採用されている切断方法である。この方法は、切断機の価格が安く、超硬刃を用いると、切り代もそれほど大きくなく、被作物の寸法精度がよく、加工速度も比較的速いなどの特徴があり、量産性に優れた加工方法として、希土類焼結磁石の切断に広く利用されている。 Various methods such as inner circumference cutting and wire saw cutting have been performed for cutting rare earth permanent magnets (sintered magnets). Among these, cutting with an outer peripheral blade is the most widely adopted cutting method. This method has a low cutting machine price, and when using a carbide blade, the cutting allowance is not so large, the dimensional accuracy of the crop is good, the processing speed is relatively fast, etc., and it is excellent in mass production As a processing method, it is widely used for cutting rare earth sintered magnets.
希土類永久磁石の切断に用いられる外周刃としては、特許文献1:特開平9−174441号公報、特許文献2:特開平10−175171号公報、特許文献3:特開平10−175172号公報等に、超硬合金台板の外周部にフェノール樹脂、Niメッキ等でダイヤモンド砥粒やcBN砥粒などを固定する技術が開示されている。台板に超硬合金を用いることによって、従来の合金工具鋼や高速度鋼に比べて台板の機械強度が向上した結果、加工切断精度の向上、薄刃使用での切り代削減による被作物の歩留まり向上、高速加工による加工コストの削減が可能となった。 As outer peripheral blades used for cutting rare earth permanent magnets, Patent Document 1: JP-A-9-174441, Patent Document 2: JP-A-10-175171, Patent Document 3: JP-A-10-175172, etc. A technique is disclosed in which diamond abrasive grains, cBN abrasive grains, and the like are fixed to the outer peripheral portion of a cemented carbide base plate by phenol resin, Ni plating, or the like. The use of cemented carbide for the base plate has improved the mechanical strength of the base plate compared to conventional alloy tool steel and high-speed steel. Yield improvement and processing cost reduction by high-speed processing became possible.
このように超硬合金台板を用いた切断刃は、従来の外周刃より優れた切断及び加工性能を示すが、市場からのコスト削減の要望は止むことが無く、更に高精度で高速な加工を実現させる高性能切断砥石の開発が切望されている。 In this way, cutting blades using a cemented carbide base plate show cutting and processing performance superior to conventional outer peripheral blades, but the demand for cost reduction from the market does not stop, and even higher precision and faster processing The development of a high-performance cutting wheel that achieves this is eagerly desired.
本出願人は、先に、リング状の超硬合金台板の外周部にフェノール樹脂等のレジンでダイヤモンド砥粒を固定する技術や、超硬合金台板の外周部に適度なヤング率を有する金属結合材でダイヤモンド砥粒やcBN砥粒などの砥粒を固定する技術を提案した(特許文献9:特開2009−172751号公報)。 The applicant previously has a technique for fixing diamond abrasive grains with a resin such as phenol resin on the outer periphery of a ring-shaped cemented carbide base plate, and an appropriate Young's modulus on the outer periphery of the cemented carbide base plate. The technique which fixes abrasive grains, such as a diamond abrasive grain and a cBN abrasive grain, with a metal binder was proposed (patent document 9: Unexamined-Japanese-Patent No. 2009-172751).
希土類焼結磁石の切断に用いる外周切断刃は、切り刃部と台板の2つの部分から構成されている。この外周切断刃の大半を占める台板を高剛性の超硬合金に替えたことによって、機械強度が向上し、それまでの合金工具鋼や高速度鋼を台板とした外周切断刃に比べ、切断加工の精度が向上した。また、この超硬合金台板に加え、結合材を適度なヤング率を有する金属に替えることによって、外周切断刃全体の機械的強度を向上させ、それまでのフェノール樹脂やポリイミド樹脂を砥粒結合材としたレジンボンドの外周切断刃に比べ、加工精度の向上、薄刃化による材料歩留まりの向上、切断速度の高速化による加工コストの低減という3つの高性能化が可能となった。 The outer peripheral cutting blade used for cutting the rare earth sintered magnet is composed of two parts, a cutting blade part and a base plate. By replacing the base plate that occupies most of the peripheral cutting blade with a high-rigidity cemented carbide, the mechanical strength is improved, compared with the peripheral cutting blades using the conventional alloy tool steel and high-speed steel as the base plate, Cutting accuracy has been improved. In addition to this cemented carbide base plate, the mechanical strength of the outer peripheral cutting blade is improved by changing the binder to a metal with an appropriate Young's modulus, and the conventional phenol resin or polyimide resin is bonded with abrasive grains. Compared to the resin bond outer peripheral cutting blades used as the material, three performance enhancements have been achieved: improved processing accuracy, improved material yield through thinner blades, and reduced processing costs through higher cutting speed.
更に、超硬合金外周切断刃の製造に関しては、台板の外周縁部近傍に磁場を形成し、その磁場が、予め磁性体でコーティングした砥粒皮膜に作用して皮膜を磁化させることで、砥粒を台板外周部に吸引させ、その状態でメッキすることによって砥粒を固定する外周切断刃の製造方法によって、超硬合金外周切断刃の製造コスト低減が可能となった。 Furthermore, regarding the manufacture of the cemented carbide outer peripheral cutting blade, a magnetic field is formed in the vicinity of the outer peripheral edge of the base plate, and the magnetic field acts on the abrasive film coated with a magnetic material in advance to magnetize the film, The manufacturing cost of the cemented carbide outer peripheral cutting blade can be reduced by the method of manufacturing the outer peripheral cutting blade in which the abrasive grains are attracted to the outer peripheral portion of the base plate and plated in this state to fix the abrasive grains.
上述した技術により提供される超硬合金台板外周切断刃は、高い性能を示す外周切断刃ではあるが、希土類焼結磁石の切断加工において、磁石が斜めに切断されることや磁石の切断面に外周切断刃の切り跡が残ることなどで寸法精度が悪化する場合がある。具体的には、外径80〜200mm、厚み0.1〜1.0mm、内穴の直径30〜80mmの超硬合金台板外周切断刃を用いて、単位時間あたりの切削体積が200mm3/min以上の高速・高負荷切断加工を行った際に、寸法公差が50μm以上になる場合があった。寸法精度が悪化した場合、磁石には切断面を精密研磨するラップ加工などの工程を増やす必要があり、外周切断刃には砥石を用いたドレスを実施することや切断条件を変更することが必要である。 The cemented carbide base plate outer periphery cutting blade provided by the above-described technology is a high performance outer peripheral cutting blade, but in the rare earth sintered magnet cutting process, the magnet is cut obliquely or the cut surface of the magnet In some cases, the dimensional accuracy may deteriorate due to, for example, a trace of the outer peripheral cutting blade remaining. Specifically, using a cemented carbide base plate outer peripheral cutting blade having an outer diameter of 80 to 200 mm, a thickness of 0.1 to 1.0 mm, and an inner hole diameter of 30 to 80 mm, the cutting volume per unit time is 200 mm 3 / When high-speed, high-load cutting processing of min or more is performed, the dimensional tolerance may be 50 μm or more. When dimensional accuracy deteriorates, it is necessary to increase the number of processes such as lapping to precisely polish the cut surface of the magnet, and it is necessary to perform dressing using a grindstone on the outer peripheral cutting blade and to change the cutting conditions It is.
このことは、例えば、ヨークと磁石のクリアランスに厳密な管理が要求されるリニアモーターやハードディスクVCM(ボイスコイルモータ)など、切断面の平面度を含めた高い寸法精度と生産コスト低減との両立が要求される磁石を加工する場合において障害となる。 This means that, for example, linear motors and hard disk VCMs (voice coil motors) that require strict control of the clearance between the yoke and magnet can achieve both high dimensional accuracy, including flatness of the cut surface, and reduction in production costs. This is an obstacle when processing the required magnets.
本発明は、上記事情に鑑みなされたものであり、高い寸法精度を有する希土類焼結磁石を加工できる超硬合金台板外周切断刃を低コストで製造する方法を提供することを目的とする。 This invention is made | formed in view of the said situation, and it aims at providing the method of manufacturing the cemented carbide base plate outer periphery cutting blade which can process the rare earth sintered magnet which has high dimensional accuracy at low cost.
希土類焼結磁石が斜めに切断される現象は、外周切断刃の刃先形状が左右対称でなく、刃が切削しやすい方向に切り進んでしまうことや、加工機に外周切断刃を取り付けた際に刃が反ってしまうことで生じると考えられる。また、磁石に切り跡が残る現象は、上記の理由により磁石を斜めに切断していた外周切断刃が、切断途中で急に進行方向を変えることにより、それまでの切断面と新たに生じた切断面とのつなぎ目が滑らかにつながらず、段差になることで発生すると考えられる。 The phenomenon that the rare earth sintered magnet is cut obliquely is that the cutting edge shape of the outer cutting blade is not symmetrical, and the blade advances in a direction that makes it easy to cut, or when the outer cutting blade is attached to the processing machine. This is thought to be caused by the warping of the blade. In addition, the phenomenon in which the traces remain on the magnet is newly generated from the previous cut surface by the outer peripheral cutting blade that cut the magnet obliquely for the above-mentioned reason, by suddenly changing the traveling direction during the cutting. It is thought that this occurs when the joint with the cut surface does not connect smoothly but becomes a step.
切断中に外周切断刃の進行方向が急に変わることは、例えば、刃先の一部に何らかの理由で変形や脱落が生じる場合、切り刃部の先端形状が急に変わる場合、切り刃部での研削速度より外周切断刃の送り速度が速いために、外周切断刃の刃先が変形し、その変形により外周切断刃に生じる内力が、外周切断刃が被作物から受ける力(外力)よりも大きくなって、刃先に変形を与えていた力が解放された場合、切断中に生じるスラッジや系外からの異物が切り溝に詰まることで、外周切断刃の進行が妨げられる場合などにおいて生じると考えられる。従って、このような状況で生じる切り跡を無くすためには、切り刃部の先端形状が急激に変わらず、かつ切断中に刃先の進行方向が変わるような力が加わった場合でも、切り刃部がある程度変形して切断面をなめらかにつなぐようにすることが有効である。 The advancing direction of the outer cutting blade suddenly changes during cutting, for example, when a part of the blade edge is deformed or dropped for some reason, or when the tip shape of the cutting blade portion changes suddenly, Since the feed speed of the outer peripheral cutting blade is faster than the grinding speed, the cutting edge of the outer peripheral cutting blade is deformed, and the internal force generated on the outer peripheral cutting blade due to the deformation becomes larger than the force (external force) that the outer peripheral cutting blade receives from the work piece. When the force that deformed the cutting edge is released, sludge generated during cutting or foreign matter from the outside of the system is clogged in the kerf, which is considered to occur when the outer peripheral cutting blade is prevented from advancing. . Therefore, in order to eliminate the cut mark generated in such a situation, the cutting edge portion is not affected even when the tip shape of the cutting edge portion changes abruptly and a force that changes the advancing direction of the cutting edge is applied during cutting. It is effective to deform to some extent and to smoothly connect the cut surfaces.
砥粒を台板に電気メッキ又は無電解メッキにより固着して切り刃部を形成した外周切断刃では、砥粒としてある程度の粒径のものが用いられるため、固着された砥粒は、砥粒と砥粒の間、及び砥粒と台板の間で、一部分でしか接触し得ず、それらの間の隙間をメッキで完全に埋めることはない。そのため、切り刃部には、メッキ後においても、隙間、即ち、切り刃部表面に連通する空隙が存在する。 In the outer peripheral cutting blade in which the abrasive grains are fixed to the base plate by electroplating or electroless plating to form the cutting edge portion, the abrasive grains having a certain size are used as the abrasive grains. Between the abrasive grains and between the abrasive grains and the base plate, only a part can be contacted, and the gap between them is not completely filled with plating. Therefore, even after plating, the cutting blade portion has a gap, that is, a gap communicating with the surface of the cutting blade portion.
切断中の外周切断刃への負荷が少ない場合、これらの隙間があっても切削中に受ける力によって大きな変形を起こすことなく高精度の切断が行なえるが、超硬合金台板が変形するような高負荷切断が行われる状況にあっては、刃先の一部が変形したり、脱落したりするおそれがある。刃先の変形や脱落を防ぐには、刃先の強度を高める方法が有効であるが、切り刃部には、後述するように、変形して切断面をなめらかにつなぐことができる弾性も必要で、変形し難いように単に高強度としただけでは対応できないことがわかった。 If the load on the outer cutting blade during cutting is small, even if these gaps exist, high-precision cutting can be performed without causing large deformation due to the force received during cutting, but the cemented carbide base plate will be deformed. In a situation where a high-load cutting is performed, a part of the cutting edge may be deformed or fall off. A method for increasing the strength of the blade edge is effective to prevent the blade edge from being deformed or dropped off, but the cutting blade portion also needs elasticity to deform and smoothly connect the cut surface, as will be described later. It turned out that it cannot respond only by making it high intensity | strength so that it may be hard to deform | transform.
そこで、本発明者らは、上記目的を達成するため鋭意検討し、高強度と弾性が両立する切り刃部の構成と、切り刃部の機械的な性質について検討したところ、上述した砥粒と砥粒の間、砥粒と台板の間に存在する隙間を利用し、この隙間に金属及び/又は合金を含浸した切り刃部が有効であり、このような切り刃部を形成した超硬合金台板外周切断刃が、切断加工する磁石の寸法精度の向上に有効であり、また、金属及び/又は合金の含浸という手法が、外周切断刃の高精度、かつ安価な製造に有効であることを見出し、本発明をなすに至った。 Therefore, the present inventors diligently studied in order to achieve the above object, and examined the configuration of the cutting blade portion that achieves both high strength and elasticity, and the mechanical properties of the cutting blade portion. A cemented carbide base in which a gap existing between the abrasive grains and the base plate is utilized, and a cutting blade part impregnated with metal and / or alloy is effective in this gap. The outer peripheral cutting blade is effective for improving the dimensional accuracy of the magnet to be cut, and the method of impregnation with metal and / or alloy is effective for the high-precision and inexpensive manufacturing of the outer peripheral cutting blade. The headline and the present invention were made.
従って、本発明は、以下の超硬合金台板外周切断刃の製造方法を提供する。
請求項1:
ヤング率450〜700GPaの超硬合金で形成され、外径80〜200mm、内径30〜80mm、厚み0.1〜1.0mmである円形リング状薄板の台板の外周縁部に近接して永久磁石を配設し、
該永久磁石が形成する磁場により、予め磁性体をコーティングしてなるダイヤモンド砥粒及び/又はcBN砥粒を上記台板の外周縁部近傍に磁気的に吸引固定し、
該吸引固定を保った状態で、電気メッキ又は無電解メッキにより、上記砥粒間及び上記砥粒と台板との間を連結して上記台板外周端部に砥粒を固着させて切り刃部を形成し、
上記砥粒間及び上記砥粒と台板との間に存する空隙に、融点が350℃以下の金属及び/又は合金を含浸することを特徴とする超硬合金台板外周切断刃の製造方法。
請求項2:
上記含浸に供する金属がSn及びPbから選ばれる1種以上であり、上記含浸に供する合金がSn−Ag−Cu合金、Sn−Ag合金、Sn−Cu合金、Sn−Zn合金及びSn−Pb合金から選ばれる1種以上である請求項1記載の超硬合金台板外周切断刃の製造方法。
請求項3:
上記含浸に供する金属及び合金のポアソン比が0.3〜0.48である請求項1又は2記載の超硬合金台板外周切断刃の製造方法。
請求項4:
上記台板の飽和磁化が40kA/m(0.05T)以上である請求項1〜3のいずれか1項に記載の超硬合金台板外周切断刃の製造方法。
請求項5:
上記砥粒の平均粒径が10〜300μmである請求項1〜4のいずれか1項に記載の超硬合金台板外周切断刃の製造方法。
請求項6:
上記砥粒の質量磁化率χgが0.2以上である請求項1〜5のいずれか1項に記載の超硬合金台板外周切断刃の製造方法。
請求項7:
上記永久磁石により台板の外周端から10mm以内の空間に8kA/m以上の磁場を形成する請求項1〜6のいずれか1項に記載の超硬合金台板外周切断刃の製造方法。
Therefore, this invention provides the manufacturing method of the following cemented carbide base plate outer periphery cutting blades.
Claim 1:
It is made of a cemented carbide with a Young's modulus of 450-700 GPa and is in close proximity to the outer peripheral edge of a circular ring-shaped thin plate base plate having an outer diameter of 80-200 mm, an inner diameter of 30-80 mm, and a thickness of 0.1-1.0 mm. A magnet,
By magnetic field formed by the permanent magnet, diamond abrasive grains and / or cBN abrasive grains, which are pre-coated with a magnetic material, are magnetically attracted and fixed in the vicinity of the outer peripheral edge of the base plate,
With the suction and fixing maintained, the cutting blade is formed by connecting the abrasive grains and between the abrasive grains and the base plate by electroplating or electroless plating to fix the abrasive grains to the outer peripheral edge of the base plate. Forming part,
A method for producing a cemented carbide base plate outer peripheral cutting blade, comprising impregnating a gap between the abrasive grains and between the abrasive grains and the base plate with a metal and / or alloy having a melting point of 350 ° C. or lower.
Claim 2:
The metal to be impregnated is at least one selected from Sn and Pb, and the alloy to be impregnated is an Sn—Ag—Cu alloy, Sn—Ag alloy, Sn—Cu alloy, Sn—Zn alloy and Sn—Pb alloy. The manufacturing method of the cemented carbide base plate outer periphery cutting blade according to claim 1, which is at least one selected from the group consisting of:
Claim 3:
The method for producing a cemented carbide base plate outer peripheral cutting blade according to claim 1 or 2, wherein the Poisson's ratio of the metal and the alloy subjected to the impregnation is 0.3 to 0.48.
Claim 4:
The method for producing a cemented carbide base plate outer peripheral cutting blade according to any one of claims 1 to 3, wherein the base plate has a saturation magnetization of 40 kA / m (0.05 T) or more.
Claim 5:
The method for producing a cemented carbide base plate outer peripheral cutting blade according to any one of claims 1 to 4, wherein the abrasive grains have an average particle diameter of 10 to 300 µm.
Claim 6:
The method of manufacturing a cemented carbide base plate outer peripheral cutting blade according to any one of claims 1 to 5, wherein the abrasive grains have a mass magnetic susceptibility χg of 0.2 or more.
Claim 7:
The manufacturing method of the cemented carbide base plate outer periphery cutting blade of any one of Claims 1-6 which forms a magnetic field of 8 kA / m or more in the space within 10 mm from the outer peripheral end of a base plate with the said permanent magnet.
本発明の製造方法は、超硬合金台板外周切断刃の製造のコストパフォーマンスが極めて高く、この超硬合金台板外周切断刃を採用することで、切断操作のみで被作物の寸法を高精度に仕上げることができ、切断後の後処理工程が省略できることから、高い寸法精度を有する希土類磁石を安価に提供することが可能となる。 The manufacturing method of the present invention has extremely high cost performance for manufacturing a cemented carbide base plate outer peripheral cutting blade, and by adopting this cemented carbide base plate outer peripheral cutting blade, the dimensions of the workpiece can be accurately adjusted only by a cutting operation. Since a post-processing step after cutting can be omitted, a rare earth magnet having high dimensional accuracy can be provided at low cost.
本発明の外周切断刃は、例えば、図1に示すように、円形薄板(円形リング状薄板)の台板10の外周縁部上に、ダイヤモンド砥粒及び/又はcBN砥粒が、電気メッキ又は無電解メッキにより形成された金属又は合金(金属結合材)で結合された切り刃部20が形成されているものである。この台板10の中央部には内穴12が形成されている。 For example, as shown in FIG. 1, the outer peripheral cutting blade of the present invention has diamond abrasive grains and / or cBN abrasive grains electroplated or deposited on the outer peripheral edge of a base plate 10 of a circular thin plate (circular ring-shaped thin plate). The cutting blade part 20 joined by a metal or an alloy (metal binder) formed by electroless plating is formed. An inner hole 12 is formed at the center of the base plate 10.
台板は、厚みが0.1〜1.0mm、好ましくは0.2〜0.8mmで、外径が80〜200mm、好ましくは100〜180mm、内穴の直径(内径)が30〜80mm、好ましくは40〜70mmの寸法を有する。 The base plate has a thickness of 0.1 to 1.0 mm, preferably 0.2 to 0.8 mm, an outer diameter of 80 to 200 mm, preferably 100 to 180 mm, an inner hole diameter (inner diameter) of 30 to 80 mm, Preferably it has a dimension of 40-70 mm.
厚み0.1〜1.0mmで外径200mm以下の範囲としたのは、精度のよい台板の製作が可能なことと、希土類焼結磁石等の被作物(ワーク)を寸法精度良く長期にわたって安定して切断できるからである。厚み0.1mm未満であると、外径によらず大きな反りが発生しやすいため、精度良い台板の製作が難しく、また、1.0mmを超えると切断加工代が大きくなる。外径をφ200mm以下としたのは、現行の超硬合金の製造技術及び加工技術での製作可能な寸法による。内穴の直径については、加工機の切断刃取り付け軸の太さに合わせ、φ30〜φ80mmとする。 The reason why the thickness is in the range of 0.1 to 1.0 mm and the outer diameter is 200 mm or less is that it is possible to manufacture an accurate base plate, and to cultivate a work (work) such as a rare earth sintered magnet with high dimensional accuracy over a long period of time. It is because it can cut stably. If the thickness is less than 0.1 mm, a large warp is likely to occur regardless of the outer diameter, so that it is difficult to manufacture an accurate base plate. If the thickness exceeds 1.0 mm, the cutting cost increases. The reason why the outer diameter is set to 200 mm or less depends on the size that can be manufactured by the current manufacturing technology and processing technology of cemented carbide. The diameter of the inner hole is set to φ30 to φ80 mm according to the thickness of the cutting blade mounting shaft of the processing machine.
台板の材質は超硬合金であり、例えば、WC、TiC、MoC、NbC、TaC、Cr3C2などの周期表IVB、VB、VIB族に属する金属の炭化物粉末をFe、Co、Ni、Mo、Cu、Pb、Sn、又はそれらの合金を用いて焼結結合した合金が好ましく、これらの中でも特にWC−Co系、WC−Ti系、C−Co系、WC−TiC−TaC−Co系の代表的なものを用い、ヤング率が450〜700GPaのものを用いる。また、これらの超硬合金においては、メッキができる程度の電気伝導性を有するか、又はパラジウム触媒などによって電気伝導性を付与できるものが好ましい。パラジウム触媒などによる電気伝導性の付与については、例えば、ABS樹脂にメッキする場合などに用いられる導電化処理剤など、公知のものを利用することができる。 The material of the base plate is a cemented carbide, for example, Fe, Co, Ni, Mo, Cu, and carbide powders of metals belonging to the periodic table IVB, VB, VIB group such as WC, TiC, MoC, NbC, TaC, Cr3C2, etc. , Pb, Sn, or alloys that are sintered and bonded using these alloys are preferable, and among them, WC—Co, WC—Ti, C—Co, and WC—TiC—TaC—Co are representative. The one with Young's modulus of 450 to 700 GPa is used. Moreover, in these cemented carbides, what has the electrical conductivity of the grade which can be plated, or can give electrical conductivity with a palladium catalyst etc. is preferable. For imparting electrical conductivity with a palladium catalyst or the like, for example, a known material such as a conductive treatment agent used when plating on an ABS resin can be used.
なお、台板の磁気的特性は、砥粒を磁気吸引により台板に固定するために飽和磁化が大きいほうが好ましいが、仮に、飽和磁化が小さくても、後述するように磁石位置や磁界の強さを制御することで予め磁性体でコーティングされた砥粒を台板に磁気吸引させることが可能なため、40kA/m(0.05T)以上であればよい。 As for the magnetic characteristics of the base plate, it is preferable that the saturation magnetization is large in order to fix the abrasive grains to the base plate by magnetic attraction. However, even if the saturation magnetization is small, as described later, the magnet position and the strength of the magnetic field are strong. By controlling the thickness, it is possible to magnetically attract abrasive grains pre-coated with a magnetic material to the base plate, so that it may be 40 kA / m (0.05 T) or more.
台板の飽和磁化は、所定厚みの台板から5mm角の測定試料を切り出し、VSMを用いて24〜25℃の間で磁化曲線(4πI−H)を測定し、第一象限における磁化の値の上限を台板の飽和磁化とすることができる。 The saturation magnetization of the base plate is obtained by cutting a 5 mm square measurement sample from a base plate of a predetermined thickness, measuring the magnetization curve (4πI-H) between 24 and 25 ° C. using VSM, and measuring the magnetization value in the first quadrant. Can be the saturation magnetization of the base plate.
台板外周部は、金属結合材で砥粒が固着され形成された切り刃部との結合強度を高めるため、C面取りやR面取りを施すことも効果的である。これらの面取りを施すことによって、刃厚調整時に台板と砥粒層との境目を誤って研削しすぎた場合でも、金属結合材が境目に残ることで、切り刃部の脱落を防ぐことができる。面取りの角度や量は、加工できる範囲が台板の厚みに依存するため、用いる台板の厚みと固着する砥粒の平均粒径に応じて決定する。 It is also effective to chamfer or chamfer the outer peripheral portion of the base plate in order to increase the bonding strength with the cutting blade portion formed by abrading the abrasive grains with a metal binder. By applying these chamfers, even if the boundary between the base plate and the abrasive layer is accidentally ground excessively when adjusting the blade thickness, the metal binder remains on the boundary, preventing the cutting edge from falling off. it can. The chamfering angle and amount are determined according to the thickness of the base plate to be used and the average particle size of the abrasive grains to be fixed because the processable range depends on the thickness of the base plate.
切り刃部を形成する砥粒としては、ダイヤモンド砥粒及び/又はcBN砥粒を用いるが、これらの砥粒は予め磁性体によってコーティングしておく必要がある。磁性体によってコーティングされる砥粒の大きさや硬さは、目的に応じて決める。 As abrasive grains for forming the cutting edge portion, diamond abrasive grains and / or cBN abrasive grains are used, but these abrasive grains need to be coated with a magnetic material in advance. The size and hardness of the abrasive grains coated with the magnetic material are determined according to the purpose.
例えば、ダイヤモンド(天然ダイヤモンド、工業用合成ダイヤモンド)砥粒、cBN(立方晶窒化ホウ素)砥粒を各々単独で用いてもよいし、ダイヤモンド砥粒とcBN砥粒との混合砥粒を用いることも可能である。また、被作物に応じて、各々の砥粒を単結晶又は多結晶の中から、各々単独又は混合して用いるなどして、割れやすさを調節することも可能である。更に、これら砥粒の表面に、Fe、Co、Crなどの金属を1μm程度スパッタリングしておくことも、後述のコーティングする磁性体との結合強度を高める方法として有効である。 For example, diamond (natural diamond, industrial synthetic diamond) abrasive grains and cBN (cubic boron nitride) abrasive grains may be used alone, or mixed abrasive grains of diamond abrasive grains and cBN abrasive grains may be used. Is possible. Further, depending on the crop, it is possible to adjust the ease of cracking by using each abrasive grain alone or in combination from single crystals or polycrystals. Furthermore, sputtering a metal such as Fe, Co, Cr or the like on the surface of these abrasive grains to about 1 μm is also effective as a method for increasing the bond strength with a magnetic material to be described later.
砥粒の大きさは、台板の厚みにもよるが、平均粒径で10〜300μmであることが好ましい。平均粒径が10μm未満であると、砥粒と砥粒の隙間が少なくなるため、切断中の目詰まりが生じやすくなり切断能力が低下するし、平均粒径300μmを超えると、磁石の切断面が粗くなるなどの不具合が生じてしまうおそれがある。このような範囲において、切断加工性や寿命などを考慮して、特定の大きさの砥粒を単独又は幾つかの組み合わせで用いればよい。 Although the magnitude | size of an abrasive grain is based also on the thickness of a baseplate, it is preferable that it is 10-300 micrometers by an average particle diameter. If the average particle size is less than 10 μm, the gap between the abrasive grains is reduced, so that clogging is likely to occur during cutting, and the cutting ability is reduced. If the average particle size exceeds 300 μm, the cut surface of the magnet There is a risk that problems such as roughening may occur. In such a range, the abrasive grains having a specific size may be used singly or in combination in consideration of cutting workability and life.
砥粒をコーティングする磁性体は、例えば、飽和磁化の低い超硬合金などの台板でも短時間で磁気吸引でき、メッキ法で固着する際に脱落しないように、砥粒の質量磁化率χgが0.2以上、好ましくは0.39以上となるように、Ni、Fe及びCoから選ばれる1種の金属、これら金属から選ばれる2種以上からなる合金、又はこれら金属若しくは合金の1種とP及びMnから選ばれる1種若しくは2種との合金を、スパッタリング、電気メッキ、無電解メッキなどの公知の方法により、皮膜の厚みが砥粒径の0.5〜100%、好ましくは2〜80%となるようにコーティングする。 The magnetic material that coats the abrasive grains can be magnetically attracted in a short time even with a base plate such as a cemented carbide with low saturation magnetization, and the mass magnetic susceptibility χg of the abrasive grains is such that it does not fall off when fixed by plating. 0.2 or more, preferably 0.39 or more, one metal selected from Ni, Fe and Co, an alloy consisting of two or more selected from these metals, or one of these metals or alloys An alloy of one or two selected from P and Mn is formed by a known method such as sputtering, electroplating, electroless plating, etc., so that the thickness of the film is 0.5 to 100% of the abrasive grain size, preferably 2 to Coat to 80%.
砥粒の磁化率はコーティングする磁性体の磁化率とコーティングするときの厚みに依存するため、砥粒の大きさによって必要な吸引力が得られるよう磁性体の種類について考慮する必要があるが、例えば、無電解ニッケルリンメッキのようにリン含有率が高くて磁化率が小さいものでも、熱処理を施すことによって、ある程度磁化率を大きくすることも可能であるし、磁化率が小さいコーティングの上に磁化率の大きなコーティングを施すように異なる磁化率のコーティングで複層化することも可能であることから、状況に合わせて適度な範囲で調節する。 Since the magnetic susceptibility of the abrasive grains depends on the magnetic susceptibility of the magnetic material to be coated and the thickness at the time of coating, it is necessary to consider the type of magnetic material so that the necessary attractive force can be obtained depending on the size of the abrasive grains. For example, even if the phosphorus content is high and the magnetic susceptibility is low, such as electroless nickel phosphorus plating, it is possible to increase the magnetic susceptibility to some extent by applying heat treatment, and on the coating with a low magnetic susceptibility. Since it is possible to form a multilayer with different magnetic susceptibility coatings so that a coating with a high magnetic susceptibility is applied, the adjustment is made within an appropriate range according to the situation.
このように砥粒の質量磁化率χgを0.2以上、好ましくは0.39以上とすれば、後述する台板外周縁部に近接して形成される磁場によって、速やかに砥粒が磁化されるため、台板と永久磁石保持具(治具本体)とで形成される後述する図3の隙間64の全ての部位において、ほぼ均等に砥粒が磁気吸引される。砥粒の質量磁化率χgが0.2未満であると、上記隙間に砥粒がうまく吸引されず、メッキ中に砥粒が脱落するなどして砥粒層(切り刃部)を形成できないか、又は砥粒層に孔部などを生じてさせるため、結果として砥粒層の機械強度を弱めてしまうおそれがある。 As described above, when the mass magnetic susceptibility χg of the abrasive grains is 0.2 or more, preferably 0.39 or more, the abrasive grains are rapidly magnetized by the magnetic field formed in the vicinity of the outer peripheral edge of the base plate described later. Therefore, the abrasive grains are magnetically attracted almost evenly in all portions of the gap 64 of FIG. 3 described later formed by the base plate and the permanent magnet holder (jig main body). If the mass magnetic susceptibility χg of the abrasive grains is less than 0.2, can the abrasive grains not be attracted well into the gaps and the abrasive grains fall off during plating, etc. to form an abrasive grain layer (cutting edge)? Or, since a hole or the like is generated in the abrasive layer, the mechanical strength of the abrasive layer may be weakened as a result.
なお、砥粒の質量磁化率は、以下の方法で測定することができる。まず、外径φ8mm、高さ5mm程度で、内径φ6mmの樹脂製容器内に、砥粒が1〜2層程度になるよう、できるだけ薄く均一に広げたあと容器から取り出して砥粒の重量を測定し、再度容器に戻してから、その上に融点50℃程度のパラフィンを被せ、全体を60℃のオーブンに入れ加熱する。次に、パラフィンが溶けた状態で容器に蓋をし、冷却する。次に、この試料を温度24〜25℃で、VSM(振動試料型磁力計:Vibrating Sample Magnetometer)を用い、初磁化曲線(4πI−H)を測定する。この初磁化曲線での微分磁化率を曲線の変曲点における傾きから求め、試料重量で割って砥粒の質量磁化率χgとする。なお、磁場はNi標準試料で校正し、砥粒の密度はタップ嵩密度を用いて測定する。 The mass magnetic susceptibility of the abrasive grains can be measured by the following method. First, spread out thinly and uniformly as much as possible in a resin container with an outer diameter of φ8mm, a height of about 5mm, and an inner diameter of φ6mm, and then remove it from the container and measure the weight of the abrasive Then, after returning to the container again, a paraffin having a melting point of about 50 ° C. is placed thereon, and the whole is put into an oven at 60 ° C. and heated. Next, the container is covered with the paraffin dissolved and cooled. Next, the initial magnetization curve (4πI-H) of the sample is measured at a temperature of 24 to 25 ° C. using a VSM (Vibrating Sample Magnetometer). The differential magnetic susceptibility in the initial magnetization curve is obtained from the slope at the inflection point of the curve, and divided by the sample weight to obtain the mass magnetic susceptibility χg of the abrasive grains. The magnetic field is calibrated with a Ni standard sample, and the density of the abrasive grains is measured using the tap bulk density.
コーティングする磁性体の厚みは、切り刃部を形成した際に作る隙間の大きさにも影響を与えるので、特に適切な範囲とすることが必要である。最小厚みは、メッキでコーティングする場合でも砥粒全体をほぼ隙間無くコーティングできる厚みである2.5μm以上となるようにするのが好ましい。例えば、上述した砥粒の好ましい平均粒径範囲の最大値300μmの場合では0.5%以上、特に0.8%以上であればよい。コーティングの厚みをこのようにすることにより、外周切断刃として切断加工する際においても、砥粒の脱落を低減できる保持力を得ることができ、また、コーティングする磁性体の種類を適切に選ぶことで、メッキ工程中に脱落すること無く、砥粒が磁場によって台板外周縁部上又は近傍に吸引される。 The thickness of the magnetic material to be coated has an influence on the size of the gap formed when the cutting blade portion is formed, and therefore it is necessary to make it particularly suitable. The minimum thickness is preferably 2.5 μm or more, which is a thickness that allows the entire abrasive grain to be coated with almost no gap even when coating by plating. For example, in the case of the maximum value 300 μm of the preferable average particle size range of the above-described abrasive grains, it may be 0.5% or more, particularly 0.8% or more. By making the coating thickness in this way, it is possible to obtain a holding force that can reduce the falling off of abrasive grains even when cutting as an outer peripheral cutting blade, and also to select the type of magnetic material to be coated appropriately Thus, the abrasive grains are attracted to or near the outer peripheral edge of the base plate by the magnetic field without falling off during the plating process.
最大厚みは、例えば、上述した砥粒の好ましい平均粒径範囲の最小値10μmの場合には、切断加工において有効に機能しない部分や、砥粒の自生作用を妨げる部分が増え、加工能力が低下するので、砥粒の平均粒径に対して100%までとすることが好ましい。 For example, if the maximum thickness is 10 μm, which is the minimum value of the preferable average particle size range of the above-mentioned abrasive grains, the portion that does not function effectively in the cutting process and the portion that hinders the self-generated action of the abrasive grains increase, and the processing capability decreases. Therefore, it is preferable that the average particle size is 100% with respect to the average grain size of the abrasive grains.
砥粒を結合する金属結合材は、後述するメッキ金属(合金)である。切り刃部の形成には、台板の外周縁部に近接して永久磁石を配設することが必要であり、例えば、台板の外周端より内側(外周切断刃としたときの回転軸側)の台板面上、又は外周端より内側で台板側面からの距離が20mm以内となる空間内に、残留磁束密度が0.3T以上である永久磁石を2個以上配置することで、台板の少なくとも外周端から10mm以内の空間に8kA/m以上の磁場を形成し、更に予め磁性体をコーティングしてなるダイヤモンド砥粒及び/又はcBN砥粒に、この磁場を作用させて磁気吸引力を生じさせ、その吸引力によりこれらの砥粒を台板外周縁部上又は近傍に磁気的に吸引固定し、その状態のまま台板外周縁部上に電気メッキ又は無電解メッキを施して、台板外周縁部上に固着する方法を採用することができる。 The metal binder for bonding the abrasive grains is a plated metal (alloy) described later. For the formation of the cutting blade part, it is necessary to dispose a permanent magnet in the vicinity of the outer peripheral edge of the base plate. For example, the inner side from the outer peripheral edge of the base plate (on the rotating shaft side when the outer peripheral cutting blade is used) ) Or two or more permanent magnets having a residual magnetic flux density of 0.3 T or more in a space within a distance of 20 mm or less from the side of the base plate on the base plate surface or inside the outer peripheral edge. Magnetic attraction force is produced by forming a magnetic field of 8 kA / m or more in a space within 10 mm from at least the outer peripheral edge of the plate and further applying this magnetic field to diamond grains and / or cBN abrasive grains coated with a magnetic material in advance. By magnetically attracting and fixing these abrasive grains on or near the outer periphery of the base plate by the attraction force, electroplating or electroless plating is performed on the outer peripheral edge of the base plate in that state, Adopting a method of fixing on the outer peripheral edge of the base plate Kill.
この際に用いる治具としては、台板の外径より大きい外径を有する絶縁体からなるカバーと、このカバーに、台板の外周端より内側になるように配置、固定された永久磁石とを有する1対の治具本体を用いることができる。メッキは、これら治具本体間に台板を保持して行うことができる。 As a jig used at this time, a cover made of an insulator having an outer diameter larger than the outer diameter of the base plate, and a permanent magnet arranged and fixed to the cover so as to be inside the outer peripheral end of the base plate; A pair of jig bodies having the following can be used. Plating can be performed by holding a base plate between these jig bodies.
図2,3は、このメッキの際に用いる治具の一例を示すもので、50,50は一対の治具本体であり、これら治具本体50,50はそれぞれ絶縁体製のカバー52,52と、これらカバー52,52に装着された永久磁石54,54とを有し、治具本体50,50間に台板1が保持される。なお、永久磁石54,54はカバー52,52内に埋設することが好ましいが、台板1と当接するように設けてもよい。 FIGS. 2 and 3 show an example of a jig used for the plating. Reference numerals 50 and 50 denote a pair of jig bodies, and the jig bodies 50 and 50 are made of insulating covers 52 and 52, respectively. And permanent magnets 54 and 54 attached to these covers 52 and 52, and the base plate 1 is held between the jig main bodies 50 and 50. The permanent magnets 54 and 54 are preferably embedded in the covers 52 and 52, but may be provided so as to contact the base plate 1.
治具に内蔵する永久磁石には、メッキ法で金属結合材を析出させて砥粒を固着させる間、台板に砥粒を吸引しつづけるだけの磁力が必要である。必要とする磁力は、台板外周縁部と磁石との距離や、予め砥粒をコーティングしている磁性体の磁化や磁化率にもよるが、残留磁束密度0.3T以上、保磁力0.2MA/m以上、好ましくは残留磁束密度0.6T以上、保磁力0.8MA/m以上、より好ましくは残留磁束密度1.0T以上、保磁力1.0MA/m以上である永久磁石を用いることで得られる。 The permanent magnet built in the jig needs to have enough magnetic force to keep the abrasive grains attracted to the base plate while depositing the metal binder by the plating method and fixing the abrasive grains. The required magnetic force depends on the distance between the outer peripheral edge of the base plate and the magnet, and the magnetization and magnetic susceptibility of the magnetic material previously coated with abrasive grains, but the residual magnetic flux density is 0.3 T or more, the coercive force is 0. Use a permanent magnet of 2 MA / m or more, preferably a residual magnetic flux density of 0.6 T or more and a coercive force of 0.8 MA / m or more, more preferably a residual magnetic flux density of 1.0 T or more and a coercive force of 1.0 MA / m or more. It is obtained by.
永久磁石の残留磁束密度は、値が大きいほど、形成する磁場の勾配を大きくできるため、局所的に砥粒を吸引したい場合には好都合である。よって、メッキ中に生じるメッキ液の撹拌や台板と治具の揺動による振動で砥粒が台板から外れてしまうことを防ぐために、0.3T以上の残留磁束密度の永久磁石を用いることが好ましい。 The larger the value of the residual magnetic flux density of the permanent magnet, the larger the gradient of the magnetic field to be formed, which is advantageous when it is desired to attract the abrasive grains locally. Therefore, use a permanent magnet with a residual magnetic flux density of 0.3T or more to prevent the abrasive grains from coming off the base plate due to the stirring of the plating solution generated during plating or the vibration caused by the swing of the base plate and jig. Is preferred.
保磁力は値が大きいほど、高温のメッキ液にさらされても長期間砥粒を台板に強く磁気吸引でき、用いる磁石の位置、形状、大きさについての自由度が大きくなって治具製作が容易となるので、必要な残留磁束密度を満たした中から選べばよい。 The larger the coercive force, the stronger the magnetic attraction of the abrasive grains to the base plate for a long time even when exposed to a high-temperature plating solution, and the greater the degree of freedom with respect to the position, shape and size of the magnet used, and jig fabrication. Therefore, it is only necessary to select from those satisfying the required residual magnetic flux density.
永久磁石のコーティングは、メッキ液に磁石が触れる場合も考慮し、メッキ液へのコーティング材の溶出やメッキ液中の金属種との置換ができるだけ少なくなるような条件で選定して、永久磁石の耐食性を高めるようにする。例えば、Niメッキ液を用いて金属結合材を析出するのであれば、Cu、Sn、Niの金属や、エポキシ樹脂やアクリル樹脂のコーティングが適している。 The permanent magnet coating should be selected under the condition that the elution of the coating material into the plating solution and the substitution of the metal species in the plating solution is as small as possible, considering the case where the magnet touches the plating solution. Increase corrosion resistance. For example, if the metal binder is deposited using a Ni plating solution, Cu, Sn, Ni metal, epoxy resin or acrylic resin coating is suitable.
治具に内蔵する永久磁石の形状と寸法及び数は、台板となる超硬合金の大きさ、所望する磁場の位置と向きと強さによる。例えば、台板外周縁部に均一に砥粒を固着させたい場合は、台板の外径に合ったリング状や円弧状の磁石、又は、1辺の長さが数mm程度の直方体状磁石を、台板外周に沿って隙間無く連続に配置する。なお、磁石にかかるコストを少なくする目的で、これら磁石の間に均等に空間を設けて個数を減らし配置してもよい。 The shape, size, and number of permanent magnets built in the jig depend on the size of the cemented carbide used as the base plate, the position, direction, and strength of the desired magnetic field. For example, if you want to uniformly fix abrasive grains to the outer peripheral edge of the base plate, a ring-shaped or arc-shaped magnet that matches the outer diameter of the base plate, or a rectangular parallelepiped magnet with a side length of about several millimeters Are arranged continuously without gaps along the outer periphery of the base plate. In order to reduce the cost of the magnets, a space may be provided between these magnets to reduce the number of magnets.
また、用いる磁石の残留磁束密度にもよるが、磁石間隔を大きくすることで予め磁性体によってコーティングされている砥粒が吸引される部分と吸引されない部分とを設けて、固着される砥粒の有る部分と無い部分を作り、矩形状の切り刃部を形成させることもできる。 Also, depending on the residual magnetic flux density of the magnet used, a portion where the abrasive grains previously coated with the magnetic material are attracted and a portion where the abrasive particles are not attracted are provided by increasing the magnet spacing. It is also possible to form a rectangular cutting blade portion by forming a portion having a portion and a portion having no portion.
なお、台板外周縁部に生じさせる磁場は、台板を挟む2つの治具本体に固定される永久磁石の位置と磁化方向の向きの組み合わせによって様々に作り出すことができるため、台板の少なくとも外周端から10mm以内の空間に8kA/m以上、好ましくは40kA/m以上の磁場が形成されるように磁場解析と実証を繰り返して決定する。磁場の強さが8kA/m未満であると、予め磁性体によってコーティングされている砥粒の吸引力が不足するため、その状態でメッキすると、メッキ中に砥粒が動いてしまい、隙間の多い切り刃部が形成されたり、砥粒が樹枝状に固定されたりして切り刃部の寸法が所望よりも大きくなるおそれがある。その結果、整形加工中に切り刃部が脱落したり、整形加工にかかる時間が長くなったりするため、製造コストが増大する場合がある。 The magnetic field generated in the outer peripheral edge of the base plate can be generated in various ways depending on the combination of the position of the permanent magnet fixed to the two jig bodies sandwiching the base plate and the direction of the magnetization direction. The magnetic field analysis and verification are repeated so that a magnetic field of 8 kA / m or more, preferably 40 kA / m or more is formed in a space within 10 mm from the outer peripheral edge. If the strength of the magnetic field is less than 8 kA / m, the attractive force of the abrasive grains that have been coated with the magnetic material is insufficient. Therefore, if plating is performed in this state, the abrasive grains move during plating, and there are many gaps. A cutting blade part may be formed, or an abrasive grain may be fixed in dendritic shape, and the dimension of a cutting blade part may become larger than desired. As a result, the cutting blade part falls off during the shaping process, or the time required for the shaping process becomes long, and the manufacturing cost may increase.
永久磁石の位置は、できるだけ砥粒を吸引させたい部分に近いほうが好ましいが、大まかには、台板の外周端より内側の台板面上又は外周端より内側で台板面からの距離が20mm以内である空間内、更に好ましくは距離10mm以内である空間内がより好ましい。この範囲の特定位置に0.3T以上の残留磁束密度を有する永久磁石をその全て又は一部分が含まれるように2個以上(治具本体1個あたり1個以上)配置することで、台板の少なくとも外周端から10mm以内の空間内に8kA/m以上の磁場を形成することができるため、合金工具鋼や高速度鋼のように飽和磁化が大きく磁力を誘導しやすい材質はもちろんのこと、超硬合金のように飽和磁化が低く磁力の誘導が小さい材質であっても、台板外周縁部に磁力が適切な磁場を形成させることができる。この磁場内に予め磁性体でコーティングされた砥粒を取り込むことで、コーティング皮膜が磁化されるため、結果として所望する台板外周縁部上又は近傍に砥粒を吸引保持することが可能となる。 The position of the permanent magnet is preferably as close as possible to the portion where the abrasive grains are to be attracted, but roughly, the distance from the base plate surface on the base plate surface inside the outer peripheral end of the base plate or inside the outer peripheral end is 20 mm. Within the space that is within, more preferably within the space that is within the distance of 10 mm. By arranging two or more permanent magnets having a residual magnetic flux density of 0.3 T or more (1 or more per jig body) at a specific position within this range so as to include all or part of the permanent magnet, Since a magnetic field of 8 kA / m or more can be formed at least in a space within 10 mm from the outer peripheral edge, not only materials such as alloy tool steel and high-speed steel that have a large saturation magnetization and are easy to induce magnetic force, Even with a material such as a hard alloy that has a low saturation magnetization and a small induction of magnetic force, a magnetic field with an appropriate magnetic force can be formed on the outer peripheral edge of the base plate. Since the coating film is magnetized by taking the abrasive grains coated in advance in the magnetic field, it is possible to attract and hold the abrasive grains on or near the desired outer periphery of the base plate. .
台板外周端からの磁石の位置が、例えば、外周端から0.5mm外側(外周切断刃としたときの回転軸から離間する側)である場合のように、台板外周端に極めて近い位置であっても、上記の範囲に含まれない場合は、台板外周端近傍の磁場強度は強くなるが、磁場勾配が反転する領域が生じやすくなるため、砥粒が台板から浮き上がるような挙動を示し砥粒が脱落しやすくなる。また、台板外周端よりも内側にあっても外周端からの距離が20mmを超えてしまうような場合には、台板の外周端から10mm以内の空間にできる磁場の強度が8kA/m未満になりやすいため、砥粒を磁気的に吸引する力が不足してしまうおそれがある。また、このような場合、磁場の強度を上げるため、磁石を大きくする方法もあるが、この方法では砥粒を吸引させたい部位近傍の磁場強度を全体的に上げてしまうため、砥粒を吸引させたくない位置に砥粒が付着しやすくなって好ましくない。また、この磁石を大きくする方法は磁石を保持する治具も大きくなってしまうため、あまり現実的ではない。 The position of the magnet from the outer peripheral edge of the base plate is very close to the outer peripheral edge of the base plate, for example, 0.5 mm outside from the outer peripheral end (the side away from the rotation axis when the outer peripheral cutting blade is used). However, if it is not included in the above range, the magnetic field strength near the outer peripheral edge of the base plate will be strong, but a region in which the magnetic field gradient is reversed tends to occur. The abrasive grains are easy to fall off. In addition, if the distance from the outer peripheral edge exceeds 20 mm even if it is inside the outer peripheral edge of the base plate, the strength of the magnetic field that can be formed in a space within 10 mm from the outer peripheral end of the base plate is less than 8 kA / m. Therefore, there is a fear that the force for magnetically attracting the abrasive grains may be insufficient. In such a case, there is a method of increasing the size of the magnet in order to increase the strength of the magnetic field, but this method increases the overall magnetic field strength in the vicinity of the part where the abrasive particles are to be attracted. Abrasive grains tend to adhere to a position where it is not desired to be applied, which is not preferable. In addition, this method of enlarging the magnet is not very realistic because the jig for holding the magnet becomes large.
治具の形状は、用いる台板の形状に合わせる。また、その寸法は治具で台板を挟んだ際に台板に対して永久磁石を所望の位置に固定できるようなものにする。例えば、台板の大きさが外径φ125mm、厚み0.26mmで、永久磁石の大きさがL2.5mm×W2mm×t1.5mmの場合には、外径125mm以上、厚み20mm程度の円板を用いることができる。 The shape of the jig is matched to the shape of the base plate to be used. Further, the dimension is set so that the permanent magnet can be fixed to a desired position with respect to the base plate when the base plate is sandwiched by a jig. For example, when the base plate has an outer diameter of 125 mm and a thickness of 0.26 mm, and the permanent magnet has a size of L2.5 mm × W2 mm × t1.5 mm, a disc having an outer diameter of 125 mm or more and a thickness of about 20 mm is used. Can be used.
より具体的には、治具の外径は所望する砥粒層の高さ(突き出し量)が確保できるように、台板の外径+(砥粒層の高さ×2)以上とし、その厚みは、材質によるが、高温のメッキ液に出し入れする際の急激な温度変化等によって反りなどが生じない程度の強度を確保できるものにする。なお、砥粒と接する部分の治具厚みは、砥粒層が台板の厚み方向にせり出す量(図1のT3)が得られるように薄くしてもよいし、せり出し量と同等の厚みのマスキングテープを用いて他の部分と同じ厚みにしてもよい。 More specifically, the outer diameter of the jig is not less than the outer diameter of the base plate + (the height of the abrasive grain layer × 2) so that the desired height (projection amount) of the abrasive grain layer can be secured. Although the thickness depends on the material, it should be strong enough to prevent warping or the like due to a sudden temperature change when taking it in and out of the high-temperature plating solution. The thickness of the jig in contact with the abrasive grains may be made thin so that the amount of the abrasive grain layer protruding in the thickness direction of the base plate (T3 in FIG. 1) may be obtained, or the thickness of the jig may be the same as the protruding amount. You may make it the same thickness as another part using a masking tape.
治具の材質は、台板を挟んだ治具全体を高温のメッキ液に浸漬して金属結合材を析出させることから、メッキが析出しない絶縁体が好ましく、その中でも耐薬品性、90℃程度までの耐熱性、メッキ液への出し入れ時に生じる急激な温度変化を繰り返し受けても安定した寸法を保つことができるような耐ヒートショック性を有することが望まれる。更に、高温のメッキ液に浸漬した際でも成型時や加工時に蓄積された内部応力などで反りを生じて台板との間に隙間を生じさせることが無いような寸法安定性も必要である。もちろん、任意の位置に永久磁石を内蔵するための溝を割れや欠けなしに高精度で加工できる加工性も求められる。 The material of the jig is preferably an insulator from which no plating is deposited because the entire jig sandwiching the base plate is immersed in a high-temperature plating solution to deposit a metal binder, and among them, chemical resistance is about 90 ° C. It is desirable to have a heat shock resistance that can maintain a stable dimension even when repeatedly subjected to a rapid temperature change that occurs during loading and unloading into the plating solution. Further, even when immersed in a high-temperature plating solution, dimensional stability is required so that a warp is not caused by an internal stress accumulated during molding or processing and a gap is not formed between the base plate and the base plate. Of course, workability is also required that can process a groove for incorporating a permanent magnet at an arbitrary position with high accuracy without cracking or chipping.
具体的なものとしては、PPS、PEEK、POM、PAR、PSF、PESなどのエンジニアリングプラスティックやアルミナなどのセラミックスを用いることができる。このような材質を用い、機械強度も考慮して厚み等の寸法を決め、永久磁石を保持する溝や、電気メッキ法を用いる場合に必要な給電電極等が収まる溝を設ける。このように製作した1対の治具本体2つを台板1枚と一体化して用いる。一体化する際には、電気メッキができるよう台板に通電するための電極等を用いて締結できるようにすれば、給電部の確保と締結を両立でき、全体も小型化できる。もちろん、一度に複数の台板にメッキできるよう、例えば、図2に示したように、治具を連結できるような構造にすれば、より効率的な生産が可能となるので好ましい。 Specifically, engineering plastics such as PPS, PEEK, POM, PAR, PSF, and PES, and ceramics such as alumina can be used. Using such a material, the thickness and other dimensions are determined in consideration of mechanical strength, and a groove for holding a permanent magnet or a groove for receiving a power supply electrode or the like necessary when using an electroplating method is provided. Two pairs of jig bodies manufactured in this way are integrated with one base plate. When integrating, if it can be fastened by using an electrode or the like for energizing the base plate so that electroplating can be performed, both securing and fastening of the power feeding portion can be achieved, and the whole can be downsized. Of course, it is preferable to use a structure in which a jig can be connected as shown in FIG. 2, for example, as shown in FIG.
即ち、図2において、56,56はそれぞれカバー52,52の中央部に装着された台板押さえを兼ねた電気メッキ用陰極体であり、これら陰極体56,56は、1対の治具本体50,50を支持、固定する導電性の支持棒58と接触し、この支持棒58から通電し得るようになっている。また、図2の治具は、2組の1対の治具本体50,50が所定間隔離間して支持棒58に取り付けられたものである。図2中、60はジョイント、62はエンドキャップである。なお、この図2の治具は電気メッキ用であり、無電解メッキ用の場合は、陰極体は必要とせず、その代わりに非導電性の押さえを設けてもよく、支持棒は必ずしも導電性である必要はない。 That is, in FIG. 2, 56 and 56 are electroplating cathode bodies that also serve as base plate holders mounted at the center of the covers 52 and 52, respectively. These cathode bodies 56 and 56 are a pair of jig bodies. 50 and 50 are brought into contact with a conductive support bar 58 for supporting and fixing, and the support bar 58 can be energized. In addition, the jig shown in FIG. 2 has two pairs of jig bodies 50, 50 attached to the support bar 58 at a predetermined interval. In FIG. 2, 60 is a joint and 62 is an end cap. The jig shown in FIG. 2 is for electroplating. In the case of electroless plating, a cathode body is not necessary, and a non-conductive presser may be provided instead. The support rod is not necessarily conductive. Need not be.
このような治具を用いてメッキを行う場合、磁性体をコーティングした砥粒は必要により天秤等で任意の質量を量り取り、永久磁石を保持した1対の治具本体で台板を挟んだ際に台板外周部と治具によって形成された隙間に吸引保持させる。図3はこの隙間を説明したもので、1対の治具本体50,50(カバー52,52)の台板1から先方に突出する突出部52a,52aと台板1の先端部との間に隙間64が形成され、この隙間64に砥粒を磁気吸引するものである。 When plating using such a jig, the abrasive coated with the magnetic material is weighed with a balance if necessary, and the base plate is sandwiched between a pair of jig bodies holding permanent magnets. At this time, it is sucked and held in the gap formed by the outer periphery of the base plate and the jig. FIG. 3 illustrates this gap. Between the protrusions 52 a and 52 a protruding forward from the base plate 1 of the pair of jig main bodies 50 and 50 (covers 52 and 52) and the tip of the base plate 1. A gap 64 is formed in the gap, and the abrasive grains are magnetically attracted into the gap 64.
保持させる砥粒の量は、用いる台板の外径と厚み、砥粒の大きさ及び所望する切り刃部の高さや幅に依存する。なお、台板外周の全ての位置で単位体積あたりの砥粒の量を均等にでき、かつメッキ法で砥粒を強固に固着させることができるように、砥粒を保持させメッキを数回繰り返し行うことも好ましい。 The amount of abrasive grains to be held depends on the outer diameter and thickness of the base plate used, the size of the abrasive grains, and the desired height and width of the cutting edge. In addition, the abrasive grains are held and plating is repeated several times so that the amount of abrasive grains per unit volume can be made uniform at all positions on the outer periphery of the base plate and the abrasive grains can be firmly fixed by plating. It is also preferable to do this.
このようにして切り刃部を形成するが、切り刃部における砥粒の体積率は、10〜80体積%、特に30〜75体積%の範囲が好ましい。10体積%未満では、切断に寄与する砥粒の割合が少なく、切断時の抵抗が増える。80体積%を超えると切断中の刃先変形量が少なくなるため、切断面に切り跡が残り被作物の寸法精度や外観を悪くしてしまう。これらの理由から切断速度を遅くせざるを得なくなるので、目的に応じて砥粒にコーティングする磁性体の厚みを変えることで粒径を変えて体積率を調整することが好ましい。 Thus, the cutting blade portion is formed, and the volume ratio of the abrasive grains in the cutting blade portion is preferably 10 to 80% by volume, particularly preferably 30 to 75% by volume. If it is less than 10% by volume, the proportion of abrasive grains contributing to cutting is small, and the resistance during cutting increases. If it exceeds 80% by volume, the amount of deformation of the cutting edge during cutting is reduced, so that traces remain on the cut surface and deteriorate the dimensional accuracy and appearance of the crop. For these reasons, the cutting speed has to be slowed down. Therefore, it is preferable to adjust the volume ratio by changing the particle diameter by changing the thickness of the magnetic material coated on the abrasive grains according to the purpose.
なお、図1(C)に示したように、切り刃部は、台板の外周縁部を挟持し、かつ台板の外周部より先方に突出して形成されており、切り刃部の厚みが台板の厚みより厚くなるように形成されていることが有効であり、従って、このように図3で示される隙間64を形成することが好ましい。 In addition, as shown in FIG.1 (C), the cutting blade part clamps the outer peripheral edge part of a base plate, and is formed ahead of the outer peripheral part of a base plate, and the thickness of a cutting blade part is formed. It is effective that the thickness is larger than the thickness of the base plate. Therefore, it is preferable to form the gap 64 shown in FIG.
この場合、図1(C)において、切り刃部の台板外周部を挟持する1対の挟持部22a,22bの長さH1は、それぞれ0.1〜10mm、特に0.5〜5mmであることが好ましい。また、これら1対の挟持部22a、22bの厚さT3は、それぞれ5μm(0.005mm)以上、より好ましくは5〜2,000μm、更に好ましくは10〜1,000μmであり、従って、これら1対の挟持部22a,22bの合計厚さ(即ち、切り刃部が台板より厚い部分の厚み)が0.01mm以上であることが好ましく、より好ましくは0.01〜4mm、更に好ましくは0.02〜2mmである。挟持部22a,22bの長さH1が0.1mm未満であると台板外周縁部の欠けや割れを防ぐ効果はあるが、台板の補強効果が少なく、切断時の抵抗による台板の変形を防げない場合がある。また、H1が10mmを超える場合は台板を補強することに対するコストパフォーマンスが低下するおそれがある。一方、T3が5μm未満であると台板の機械的強度を高めることができないし、切断スラッジを効果的に排出することができなくなるおそれがある。 In this case, in FIG. 1C, the length H1 of the pair of sandwiching portions 22a and 22b for sandwiching the outer peripheral portion of the base plate of the cutting blade portion is 0.1 to 10 mm, particularly 0.5 to 5 mm. It is preferable. Further, the thickness T3 of the pair of sandwiching portions 22a and 22b is 5 μm (0.005 mm) or more, more preferably 5 to 2,000 μm, still more preferably 10 to 1,000 μm. The total thickness of the pair of sandwiching portions 22a and 22b (that is, the thickness of the portion where the cutting blade portion is thicker than the base plate) is preferably 0.01 mm or more, more preferably 0.01 to 4 mm, and still more preferably 0. 0.02 to 2 mm. If the length H1 of the clamping portions 22a and 22b is less than 0.1 mm, there is an effect of preventing chipping and cracking of the outer peripheral edge of the base plate, but there is little reinforcing effect of the base plate, and the base plate is deformed by resistance during cutting. May not be prevented. Moreover, when H1 exceeds 10 mm, there exists a possibility that the cost performance with respect to reinforcing a baseplate may fall. On the other hand, if T3 is less than 5 μm, the mechanical strength of the base plate cannot be increased, and cutting sludge may not be effectively discharged.
なお、図4(A)〜(D)に示したように、挟持部22a,22bは、金属結合材24と砥粒26から形成されていてもよく[図4(A)]、金属結合材のみによって形成されていてもよく[図4(B)]、金属結合材のみによって台板10を覆い、更にこれを被覆して金属結合材と砥粒との層を形成するようにしてもよい[図4(C)]。なお、図4(C)の外側に全体を覆うように金属結合材を析出させて[図4(D)]のようにすると、切り刃部の強度を更に上げることができる。 4A to 4D, the sandwiching portions 22a and 22b may be formed of a metal binder 24 and abrasive grains 26 [FIG. 4A]. The base plate 10 may be covered only with the metal binder and further covered to form a layer of the metal binder and abrasive grains. [FIG. 4C]. It should be noted that the strength of the cutting blade can be further increased by depositing a metal binding material so as to cover the whole outside of FIG. 4 (C), as shown in FIG. 4 (D).
更に、図4(B)〜(D)のように、挟持部の台板10に接する部分を金属結合材24のみによって形成する方法としては、例えば、台板の挟持部が形成されるべき部分のみを露出させて他の部分をマスキングし、この状態でメッキを行った後、上記した治具を装着し、隙間64に砥粒26を充填してメッキを行う方法が採用され、砥粒26を電着した後に、例えば、電着部分が露出するような外径の図2のカバー52,52で台板10をマスキングして更にメッキを行うことにより、図4(D)のように、切り刃部最外層として金属結合材24のみからなる層を形成することができる。 Further, as shown in FIGS. 4B to 4D, as a method of forming the portion of the sandwiching portion in contact with the base plate 10 with only the metal binder 24, for example, the portion where the sandwiching portion of the base plate is to be formed. In this state, the plating is performed with the above-described jig mounted, the gap 26 filled with the abrasive grains 26, and plating is performed. After electrodeposition, for example, by masking the base plate 10 with the cover 52, 52 of FIG. 2 having an outer diameter that exposes the electrodeposition portion, and further plating, as shown in FIG. As the outermost layer of the cutting blade portion, a layer made of only the metal binder 24 can be formed.
切り刃部20の台板10より先方に突出している突出部の突出長さ(図1(C)のH2)は、固着する砥粒の大きさによるが0.1〜10mm、特に0.3〜8mmであることが好ましい。突出長さが0.1mm未満であると、切断時の衝撃や磨耗によって切り刃部が無くなるまでの時間が短く、結果として刃の寿命が短くなってしまうし、10mmを超えると刃厚(図1のT2)にもよるが、切り刃部が変形しやすくなり、切断面がうねったりして切断した磁石の寸法精度が悪くなるおそれがある。なお、切り刃部は、金属結合材24及び砥粒26と後述の含浸金属及び/又は含浸合金から形成されている。 The protruding length (H2 in FIG. 1C) of the protruding portion protruding forward from the base plate 10 of the cutting blade portion 20 is 0.1 to 10 mm, particularly 0.3 depending on the size of the abrasive grains to be fixed. It is preferably ˜8 mm. If the protrusion length is less than 0.1 mm, the time until the cutting blade portion disappears due to impact or wear during cutting is short, resulting in a shortened blade life. Although it depends on T2 of 1), the cutting blade portion is likely to be deformed, and the dimensional accuracy of the cut magnet may be deteriorated due to a wavy cut surface. In addition, the cutting blade part is formed from the metal binder 24 and the abrasive grain 26 and the impregnation metal and / or impregnation alloy mentioned later.
金属結合材は、メッキにより形成された金属又は合金であり、Ni、Fe、Co、Cu及びSnから選ばれる1種の金属、これら金属から選ばれる2種以上からなる合金、又はこれら金属若しくは合金の1種とP及びMnから選ばれる1種又は2種との合金が好ましく、これをメッキによって砥粒間及び砥粒と台板との間を連結するように析出させる。 The metal binding material is a metal or alloy formed by plating, one metal selected from Ni, Fe, Co, Cu and Sn, an alloy consisting of two or more selected from these metals, or these metals or alloys An alloy of one of these and one or two selected from P and Mn is preferable, and this is deposited by plating so as to connect between the abrasive grains and between the abrasive grains and the base plate.
金属結合材をメッキで形成する方法には、大きく分けて電着法(電気メッキ法)と無電解メッキ法の2種類があるが、本発明では、結合材に残留する内部応力の制御が容易で生産コストの安い電着法と、メッキ液が入り込みさえすれば金属結合材を比較的均一に析出できる無電解メッキ法とを、切り刃部に含まれる隙間が後述する適度な範囲となるように、各々単独で又は組み合わせて用いる。 There are two types of methods for forming a metal binding material by plating: an electrodeposition method (electroplating method) and an electroless plating method. In the present invention, it is easy to control the internal stress remaining in the binding material. The electrodeposition method with a low production cost and the electroless plating method that deposits the metal binder relatively uniformly as long as the plating solution enters, so that the gap included in the cutting edge is within the appropriate range described later. Are used alone or in combination.
NiメッキやCuメッキなどの単一金属、例えば、スルファミン酸Niメッキ液を用いた電気メッキ法を用いる場合は、主成分となるスルファミン酸ニッケルの濃度、メッキ時の電流密度、メッキ液の温度を好適な範囲とし、かつオルソベンゼンスルフォンイミドやパラトルエンスルフォンアミドなどの有機添加物の添加や、Zn、S、Mnなどの元素を加え、皮膜の応力を調整するなどして実施すればよい。 In the case of using an electroplating method using a single metal such as Ni plating or Cu plating, for example, Ni sulfamate plating solution, the concentration of nickel sulfamate as the main component, the current density during plating, and the temperature of the plating solution It may be carried out by adjusting the stress of the film by adding an organic additive such as orthobenzenesulfonimide and paratoluenesulfonamide, or adding elements such as Zn, S and Mn.
その他、Ni−Fe合金、Ni−Mn合金、Ni−P合金、Ni−Co合金、Ni−Sn合金などの合金メッキの場合は、合金中のFe、Mn、P、Co、Snの含有量、メッキ液の温度などを好適な範囲にするなどして皮膜の応力を調整する。もちろんこれらの合金メッキの場合でも応力を調整できる有機添加物の併用は効果的である。 In addition, in the case of alloy plating such as Ni-Fe alloy, Ni-Mn alloy, Ni-P alloy, Ni-Co alloy, Ni-Sn alloy, the content of Fe, Mn, P, Co, Sn in the alloy, The film stress is adjusted by adjusting the temperature of the plating solution to a suitable range. Of course, even in the case of these alloy platings, the combined use of organic additives capable of adjusting the stress is effective.
メッキは、単一金属又は合金を析出させる従来公知のメッキ液を用いてそのメッキ液における通常のメッキ条件を採用して公知の方法で行うことができる。 The plating can be performed by a known method using a conventionally known plating solution for depositing a single metal or alloy and adopting normal plating conditions in the plating solution.
好適な電気メッキ液としては、例えば、スルファミン酸ニッケルが250〜600g/L、硫酸ニッケルが50〜200g/L、塩化ニッケルが5〜70g/L、ホウ酸が20〜40g/L、オルソベンゼンスルフォンイミドが適量の電気スルファミン酸ワットニッケルメッキ液、ピロリン酸銅が30〜150g/L、ピロリン酸カリウムが100〜450g/L、25%アンモニア水が1〜20mL/L、硝酸カリウムが5〜20g/Lの電気ピロリン酸銅メッキ液などが挙げられる。また、無電解メッキ液としては、硫酸ニッケルが10〜50g/L、次亜リン酸ナトリウムが10〜50g/L、酢酸ナトリウムが10〜30g/L、クエン酸ナトリウムが5〜30g/L、チオ尿素が適量の無電解ニッケル・リン合金メッキ液などが挙げられる。 Suitable electroplating solutions include, for example, nickel sulfamate 250 to 600 g / L, nickel sulfate 50 to 200 g / L, nickel chloride 5 to 70 g / L, boric acid 20 to 40 g / L, orthobenzene sulfone. Nickel electrosulfamate plating solution with appropriate amount of imide, copper pyrophosphate 30-150 g / L, potassium pyrophosphate 100-450 g / L, 25% aqueous ammonia 1-20 mL / L, potassium nitrate 5-20 g / L And an electropyrophosphate copper plating solution. The electroless plating solution includes 10-50 g / L of nickel sulfate, 10-50 g / L of sodium hypophosphite, 10-30 g / L of sodium acetate, 5-30 g / L of sodium citrate, An electroless nickel / phosphorous alloy plating solution with an appropriate amount of urea may be used.
このような方法により、ダイヤモンド砥粒、cBN砥粒又はダイヤモンド砥粒とcBN砥粒との混合砥粒を台板の外周部に最終形状に近い寸法で高精度に形成する。 By such a method, diamond abrasive grains, cBN abrasive grains, or mixed abrasive grains of diamond abrasive grains and cBN abrasive grains are formed on the outer periphery of the base plate with a size close to the final shape with high accuracy.
本発明においては、上述した方法で得られた、切り刃部の砥粒間及び砥粒と台板との間に存在する空隙に、融点が350℃以下の金属及び/又は合金を含浸する。これにより、本発明の超硬合金台板外周切断刃では、切り刃部の内部及び表面の、粒間及び砥粒と台板との間に、融点が350℃以下の金属及び/又は合金が含まれている。 In the present invention, metal and / or an alloy having a melting point of 350 ° C. or less is impregnated in the gaps between the abrasive grains of the cutting blade portion and between the abrasive grains and the base plate obtained by the above-described method. Thereby, in the cemented carbide base plate outer periphery cutting blade of the present invention, a metal and / or alloy having a melting point of 350 ° C. or less is present between the grains and between the abrasive grains and the base plate inside and on the surface of the cutting blade portion. include.
この含浸する金属としては、Sn、Pbが挙げられ、また、含浸する合金としては、Sn−Ag−Cu合金、Sn−Ag合金、Sn−Cu合金、Sn−Zn合金、Sn−Pb合金が挙げられ、これらから選ばれる1種以上を用い得る。 Examples of the impregnated metal include Sn and Pb, and examples of the impregnated alloy include Sn—Ag—Cu alloy, Sn—Ag alloy, Sn—Cu alloy, Sn—Zn alloy, and Sn—Pb alloy. One or more selected from these can be used.
金属又は合金を切り刃部に含浸する方法として具体的には、例えば、φ0.1〜2.0mm、好ましくはφ0.8〜1.5mmの線状、粉状、又は切り刃部の形状寸法と同じで厚みが0.05〜1.5mmのリング状の薄膜状に加工した金属又は合金を、切り刃部に載せ、ホットプレートのような加熱器上、オーブンの中などで、融点以上に昇温し、溶融した金属又は合金を、切り刃部に含浸させ、その後、徐々に冷却して室温に戻す方法が挙げられる。この他、切り刃部の近傍に幾らかのクリアランスがある下金型に、含浸前の外周切断刃を入れた後、予め計り取った金属や合金を充填して上金型をはめ、上下に適度に加圧しながら加熱して、金属や合金を切り刃部に含浸させ、冷却してから脱圧し、金型から取り出す方法も可能である。加熱後は、ひずみが残らないように、徐々に冷却する。 Specifically, as a method of impregnating the cutting blade part with metal or alloy, for example, φ0.1-2.0 mm, preferably φ0.8-1.5 mm linear, powdery, or the shape of the cutting edge A metal or alloy processed into a ring-shaped thin film with a thickness of 0.05 to 1.5 mm is placed on the cutting blade and heated above the melting point on a heater such as a hot plate or in an oven. There is a method in which the temperature is raised and the molten metal or alloy is impregnated in the cutting edge, and then gradually cooled to room temperature. In addition, after putting the outer peripheral cutting blade before impregnation into the lower mold with some clearance in the vicinity of the cutting blade part, fill the pre-measured metal or alloy and fit the upper mold, up and down It is also possible to use a method in which a metal or alloy is impregnated into the cutting blade, heated under moderate pressure, cooled, depressurized, and taken out from the mold. After heating, cool gradually so that no strain remains.
なお、切り刃部に金属又は合金を載せる際に、金属又は合金を切り刃部に固定する目的や、切り刃部の濡れ性をよくする目的で、予め、例えば、塩素やフッ素が含有されている市販のソルダーフラックスなどを塗布することも有効である。 In addition, when placing a metal or alloy on the cutting edge, for example, chlorine or fluorine is contained in advance for the purpose of fixing the metal or alloy to the cutting edge or improving the wettability of the cutting edge. It is also effective to apply commercially available solder flux.
濡れ性が比較的高い低融点金属や合金を含浸させる場合には、台板をステンレス、鉄、銅などの金属で挟んでから通電して、この金属を発熱させることで台板及び切り刃部を加熱し、低融点金属を溶かした溶湯に発熱した切り刃部を接触させて含浸することもできる。 When impregnating a low melting point metal or alloy with a relatively high wettability, the base plate and the cutting blade part are heated by energizing the base plate with a metal such as stainless steel, iron, copper, etc. Can be impregnated by heating, and contacting the heated cutting blade with a molten metal in which a low melting point metal is melted.
このようにして得られた切り刃部は、砥粒、砥粒をコーティングしている磁性体、金属結合材、隙間に含浸した金属、合金が適度に分散した状態になっている。 The cutting blade portion thus obtained is in a state in which abrasive grains, a magnetic material coated with the abrasive grains, a metal binder, a metal impregnated in the gap, and an alloy are appropriately dispersed.
なお、これら切り刃部に含浸させる金属、合金の物性は、以下のものが適している。融点は、超硬合金台板にひずみが生じて寸法精度が悪化すること、機械的強度が変化すること、超硬合金台板と切り刃部の熱膨張差が顕著となって切り刃部が変形したり、ひずみが残ったりすることを防ぐため350℃以下、好ましくは300℃以下が適している。 In addition, the following are suitable for the physical properties of the metal and alloy impregnated in these cutting blade portions. The melting point is that the cemented carbide base plate is distorted and the dimensional accuracy deteriorates, the mechanical strength changes, the difference in thermal expansion between the cemented carbide base plate and the cutting blade part becomes significant, and the cutting blade part is In order to prevent deformation and remaining distortion, 350 ° C. or lower, preferably 300 ° C. or lower is suitable.
金属、合金の弾性は、ポアソン比が0.3〜0.48、好ましくは0.33〜0.44であるものが適している。ポアソン比が0.3より低い場合、柔軟性が乏しく、切断面をなめらかにつなぐことが難しくなる。ポアソン比が0.48よりも高い場合は、硬度など他の物性が不足するため、刃先の変形が大きくなりすぎる。ポアソン比は、含浸に供する金属及び合金の15×15×15mmの試料を用い、パルス超音波法により測定することができる。 For the elasticity of metals and alloys, those having a Poisson's ratio of 0.3 to 0.48, preferably 0.33 to 0.44 are suitable. When the Poisson's ratio is lower than 0.3, the flexibility is poor and it is difficult to connect the cut surfaces smoothly. When the Poisson's ratio is higher than 0.48, other physical properties such as hardness are insufficient, so that the deformation of the cutting edge becomes too large. The Poisson's ratio can be measured by a pulse ultrasonic method using 15 × 15 × 15 mm samples of metals and alloys to be impregnated.
金属、合金の硬度は、切断中に砥粒が摩滅、破壊、脱落するなどしても次の砥粒が露出して切断に寄与する作用(砥粒の自生作用)を妨げない程度でよく、砥粒を被覆している磁性体や砥粒を固着している金属結合材よりも低いものが好ましい。また、切削加工する際に用いられる加工油やクーラントに曝されても強度変化や腐食を起こさないことも必要である。 The hardness of the metal and alloy may be such that even if the abrasive grains are worn, destroyed or dropped during cutting, the next abrasive grains are exposed and do not interfere with the action that contributes to cutting (the self-generating action of the abrasive grains) A material that is lower than the magnetic body covering the abrasive grains or the metal binding material fixing the abrasive grains is preferable. In addition, it is necessary to prevent strength change and corrosion even when exposed to processing oil or coolant used for cutting.
金属、合金を含浸させた切り刃部は、必要に応じて、酸化アルミ、炭化ケイ素、ダイヤモンドなどの砥石による研削加工や、放電加工などを用いて所望の寸法に整える。この際、刃厚にもよるが、刃先にC0.1以上又はR0.1以上の面取りを施すことは、切断面の切り跡を少なくすることに加えて、磁石端面のカケも低減することができるので有効である。 The cutting blade part impregnated with a metal or alloy is adjusted to a desired dimension by grinding with a grindstone such as aluminum oxide, silicon carbide, or diamond, or electrical discharge machining, if necessary. At this time, depending on the blade thickness, chamfering C0.1 or more or R0.1 or more on the cutting edge reduces not only traces of the cut surface, but also reduces the chip end of the magnet. It is effective because it is possible.
本発明の外周切断刃を適用した切断は、その被作物(被切断物)としては、R−Co系希土類焼結磁石、R−Fe−B系希土類焼結磁石(RはYを含む希土類元素の少なくとも1種)に対する切断において効果的である。これら磁石は、例えば、次のようにして製造される。 The cutting to which the outer peripheral cutting blade of the present invention is applied includes R-Co-based rare earth sintered magnets and R-Fe-B-based rare earth sintered magnets (R is a rare earth element including Y). It is effective in the cutting | disconnection with respect to at least 1 sort (s). These magnets are manufactured as follows, for example.
R−Co系希土類焼結磁石は、RCo5系、R2Co17系などがある。このうち、例えば、R2Co17系では、質量百分率で20〜28%のR、5〜30%のFe、3〜10%のCu、1〜5%のZr、残部Coからなる。このような成分比で原料を秤量して溶解、鋳造し、得られた合金を平均粒径1〜20μmまで微粉砕し、R2Co17系磁石粉末を得る。その後、磁場中成形し、更に1,100〜1,250℃で0.5〜5時間焼結し、次いで焼結温度より0〜50℃低い温度で0.5〜5時間、溶体化し、最後に700〜950℃で一定時間保持した後、冷却する時効処理を施す。 R-Co based rare earth sintered magnets include RCo 5 and R 2 Co 17 systems. Among these, for example, the R 2 Co 17 system is composed of 20 to 28% R, 5 to 30% Fe, 3 to 10% Cu, 1 to 5% Zr, and the balance Co in mass percentages. The raw materials are weighed at such a component ratio, melted and cast, and the obtained alloy is finely pulverized to an average particle size of 1 to 20 μm to obtain an R 2 Co 17- based magnet powder. Thereafter, it is molded in a magnetic field, further sintered at 1,100 to 1,250 ° C. for 0.5 to 5 hours, and then solutionized at a temperature 0 to 50 ° C. lower than the sintering temperature for 0.5 to 5 hours. Then, after aging at 700 to 950 ° C. for a certain time, an aging treatment for cooling is performed.
R−Fe−B系希土類焼結磁石は、質量百分率で5〜40%のR、50〜90%のFe、0.2〜8%のBからなり、磁気特性や耐食性を改善するために、C、Al、Si、Ti、V、Cr、Mn、Co、Ni、Cu、Zn、Ga、Zr、Nb、Mo、Ag、Sn、Hf、Ta、Wなどの添加元素を加える。これら添加元素の添加量は、Coの場合、質量百分率で30%以下、その他の元素の場合には質量百分率で8%以下である。このような成分比で原料を秤量して溶解、鋳造し、得られた合金を平均粒径1〜20μmまで微粉砕し、R−Fe−B系磁石粉末を得る。その後、磁場中成形し、更に1,000〜1,200℃で0.5〜5時間焼結し、400〜1,000℃で一定時間保持した後、冷却する時効処理を施す。 The R-Fe-B rare earth sintered magnet is composed of 5 to 40% R, 50 to 90% Fe, and 0.2 to 8% B in terms of mass percentage. In order to improve magnetic properties and corrosion resistance, Additive elements such as C, Al, Si, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Sn, Hf, Ta, and W are added. The addition amount of these additive elements is 30% or less in terms of mass percentage in the case of Co, and 8% or less in terms of mass percentage in the case of other elements. The raw materials are weighed and melted and cast in such a component ratio, and the obtained alloy is finely pulverized to an average particle size of 1 to 20 μm to obtain an R—Fe—B magnet powder. Thereafter, it is molded in a magnetic field, further sintered at 1,000 to 1,200 ° C. for 0.5 to 5 hours, held at 400 to 1,000 ° C. for a certain time, and then subjected to aging treatment for cooling.
このような本発明の外周切断刃は、特に、刃先の圧縮剪断応力が、所定の範囲にあると、切断面に切り跡を残すことなく、高い寸法精度で希土類磁石を切り出すことができ、有効である。例えば、外周切断刃において、切り刃部の厚みを0.1〜1.0mm、外径を80〜200mm、刃先の面取りをR又はCで0.1以上に整えた後、外周切断刃を水平に切り刃部のみ露出する厚み5mmの円形鉄板で外周切断刃を上下から挟む支持治具を用いて、押圧時に台板部分が反らないように保持し、超硬合金台板の外周から外方に0.3mm離れた位置において、切り刃部を、接触部の長さが(切り刃部の突き出し量−0.3mm)、幅が10mmの圧子で、外周切断刃の回転軸方向(切り刃部の厚み方向)に線速1mm/minで押圧し、これを切り刃部が破断するまで継続して圧子の移動量に対する応力を測定する。この場合に圧子の移動量が大きくなると、グラフが直線性を示す領域、即ち、圧子の移動量と応力とが比例する領域が確認される。この変形量と応力の比例領域の傾きを算出すると、100〜10,000N/mmの範囲のものが、切断面に切り跡を残すことなく、高い寸法精度の磁石を切り出すことができ、特に有効である。 Such an outer peripheral cutting blade of the present invention can cut out a rare earth magnet with high dimensional accuracy without leaving a trace on the cutting surface, particularly when the compression shear stress of the cutting edge is within a predetermined range, and is effective. It is. For example, in the outer peripheral cutting blade, after adjusting the thickness of the cutting blade portion to 0.1 to 1.0 mm, the outer diameter to 80 to 200 mm, and chamfering the blade edge to 0.1 or more with R or C, the outer peripheral cutting blade is horizontally Using a support jig that sandwiches the outer peripheral cutting blade from above and below with a circular iron plate with a thickness of 5 mm that exposes only the cutting edge, the base plate does not warp when pressed and is removed from the outer periphery of the cemented carbide base plate. At a position 0.3 mm away, the cutting blade portion is moved in the direction of the rotation axis of the outer cutting blade (cutting blade) with an indenter having a contact portion length (projection amount of the cutting blade portion -0.3 mm) and a width of 10 mm. It is pressed at a linear velocity of 1 mm / min in the thickness direction of the blade portion, and this is continuously measured until the cutting blade portion breaks, and the stress with respect to the moving amount of the indenter is measured. In this case, when the amount of movement of the indenter increases, a region where the graph shows linearity, that is, a region where the amount of movement of the indenter is proportional to the stress is confirmed. When calculating the slope of the proportional area between the amount of deformation and stress, a magnet with a range of 100 to 10,000 N / mm can cut out a magnet with high dimensional accuracy without leaving a trace on the cut surface, which is particularly effective. It is.
以下、実施例及び比較例を示し、本発明を具体的に説明するが、本発明は下記の実施例に制限されるものではない。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.
[実施例1]
質量百分率でWCが90%、Coが10%の超硬合金を外径φ125mm×内径φ40mm×厚み0.3mmのドーナツ状孔あき円板に加工し、台板とした。この台板のヤング率は600GPa、飽和磁化は127kA/m(0.16T)であった。
[Example 1]
A cemented carbide having a mass percentage of WC of 90% and Co of 10% was processed into a donut-shaped perforated disk having an outer diameter of φ125 mm, an inner diameter of φ40 mm, and a thickness of 0.3 mm to obtain a base plate. The base plate had a Young's modulus of 600 GPa and a saturation magnetization of 127 kA / m (0.16 T).
この台板を外周端から内側1.0mmの部分のみが露出するように粘着テープでマスキングして、市販のアルカリ脱脂水溶液に40℃、10分間浸漬した後、水洗し、50℃のピロリン酸ナトリウム30〜80g/Lの水溶液に2〜8A/dm2で通電しながら電解した。次に、超硬合金台板を純水中で超音波洗浄した後、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して下地メッキした後、マスキングテープを剥がして水洗した。 This base plate is masked with an adhesive tape so that only the inner 1.0 mm portion from the outer peripheral edge is exposed, immersed in a commercially available alkaline degreasing solution at 40 ° C. for 10 minutes, washed with water, and sodium pyrophosphate at 50 ° C. It electrolyzed, supplying with electricity at 2-8 A / dm < 2 > to 30-80 g / L aqueous solution. Next, the cemented carbide base plate is ultrasonically cleaned in pure water, then immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in a range of 5 to 20 A / dm 2 , and subjected to base plating, followed by masking. The tape was peeled off and washed with water.
次いで、外径φ130mm、厚み10mmのPPS樹脂製円盤の一側面に、外径φ123mm、内径φ119mm、深さ1.5mmの溝を形成し、この溝に、長さ2.5mm×幅2mm×厚み1.5mmの永久磁石(信越レアアースマグネット製N39UH、Br=1.25T)を、厚み方向を円盤の深さ方向として、均等間隔で円盤1個あたり75個配列させた後、溝をエポキシ樹脂で埋めて磁石を固定したカバーを作製し、このカバー2枚からなる治具本体で、磁石側を内側にして台板を挟持した。このとき、磁石は台板外周端から台板側面内側方向に1mm離れていた。なお、台板外周端から10mmまでの空間内に形成される磁場について磁界解析したところ、磁場強度は8kA/m(0.01T)以上であった。 Next, a groove having an outer diameter of φ123 mm, an inner diameter of φ119 mm, and a depth of 1.5 mm is formed on one side of a PPS resin disk having an outer diameter of φ130 mm and a thickness of 10 mm, and the length is 2.5 mm × width 2 mm × thickness. After arranging 1.5mm permanent magnets (N39UH made by Shin-Etsu Rare Earth Magnet, Br = 1.25T) with the thickness direction being the depth direction of the disk at regular intervals, the grooves were made of epoxy resin. A cover in which the magnet was fixed by being buried was prepared, and the base plate was sandwiched between the two jig covers with the magnet side inside. At this time, the magnet was 1 mm away from the outer peripheral edge of the base plate toward the inner side of the base plate side surface. In addition, when the magnetic field analysis was carried out about the magnetic field formed in the space from the outer peripheral edge of a baseplate to 10 mm, the magnetic field intensity was 8 kA / m (0.01T) or more.
予めNiPメッキした質量磁化率χg0.588、平均粒径135μmのダイヤモンド砥粒0.4gを治具と台板とで作られる凹みに全周均等になるように磁気吸引させた。次に、砥粒が磁気吸引された状態のまま、治具ごと50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して電気メッキした後、水洗した。その後、ダイヤモンド砥粒0.4gを磁気吸引させ、上記と同様にメッキして水洗する操作を再度繰り返した。 NiP-plated mass magnetic susceptibility χ g of 0.588 and diamond abrasive grains of 0.4 g having an average particle size of 135 μm were magnetically attracted to a recess made of a jig and a base plate so as to be even all around. Next, while the abrasive grains were magnetically attracted, the entire jig was immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in the range of 5 to 20 A / dm 2 and electroplated, and then washed with water. Thereafter, 0.4 g of diamond abrasive grains were magnetically attracted, and the operation of plating and washing in the same manner as described above was repeated again.
治具本体を、得られた砥粒層両側面が露出するように、外径φ123mm、厚み10mmのPPS樹脂製円盤に交換して、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して、切り刃部全体を覆うようにメッキ析出させた後、水洗し、治具から取り外して、乾燥した。 The jig body was replaced with a PPS resin disk having an outer diameter of φ123 mm and a thickness of 10 mm so that both sides of the obtained abrasive layer were exposed, and immersed in a 50 ° C. sulfamic acid watt nickel plating solution, After energizing in the range of 20 A / dm 2 to deposit the plating so as to cover the entire cutting blade, it was washed with water, removed from the jig, and dried.
次いで、φ1.0mmのワイヤー状に加工したSn−3Ag−0.5Cu合金を、外周切断刃の切り刃部の側面にリング状に載せ、その状態のまま200℃のオーブンに入れた後、オーブン内部の温度が200℃に到達したのを確認して、250℃に昇温し、250℃で約5分間保った後、加熱を切ってオーブン内で自然冷却した。なお、Sn−3Ag−0.5Cu合金の融点は220℃、ポアソン比は0.35である。 Next, a Sn-3Ag-0.5Cu alloy processed into a wire shape of φ1.0 mm was placed in a ring shape on the side surface of the cutting edge portion of the outer peripheral cutting blade, and put in an oven at 200 ° C. in that state, then the oven After confirming that the internal temperature reached 200 ° C., the temperature was raised to 250 ° C. and kept at 250 ° C. for about 5 minutes, and then the heating was turned off and the product was naturally cooled in an oven. The Sn-3Ag-0.5Cu alloy has a melting point of 220 ° C. and a Poisson's ratio of 0.35.
その後、平面研削盤を用いて、超硬合金台板からの砥粒層のせり出しが片側50μmになるように砥石で研削して砥粒層のせり出しと厚みを整えた後、ワイヤー放電加工して外径を整え、ドレスして、厚み0.4mm、外径127mmの砥粒層(切り刃部)を形成した超硬合金台板外周切断刃を得た。図5に切り刃部の刃先側面の顕微鏡写真を示す。 Then, using a surface grinder, grind with a grindstone so that the protrusion of the abrasive layer from the cemented carbide base plate is 50 μm on one side, and adjust the protrusion and thickness of the abrasive layer, then wire electric discharge machining The outer diameter was adjusted and dressed to obtain a cemented carbide base plate outer peripheral cutting blade having an abrasive layer (cutting blade portion) having a thickness of 0.4 mm and an outer diameter of 127 mm. FIG. 5 shows a photomicrograph of the side surface of the cutting edge portion.
[実施例2]
質量百分率でWCが90%、Coが10%の超硬合金を外径φ125mm×内径φ40mm×厚み0.3mmのドーナツ状孔あき円板に加工し、台板とした。
[Example 2]
A cemented carbide having a mass percentage of WC of 90% and Co of 10% was processed into a donut-shaped perforated disk having an outer diameter of φ125 mm, an inner diameter of φ40 mm, and a thickness of 0.3 mm to obtain a base plate.
この台板を外周端から内側1.5mmの部分のみが露出するように粘着テープでマスキングして、市販のアルカリ脱脂水溶液に40℃、10分間浸漬した後、水洗し、50℃のピロリン酸ナトリウム30〜80g/Lの水溶液に2〜8A/dm2で通電しながら電解した。次に、超硬合金台板を純水中で超音波洗浄した後、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して下地メッキした後、マスキングテープを剥がして水洗した。 This base plate is masked with an adhesive tape so that only the inner 1.5 mm portion from the outer peripheral edge is exposed, immersed in a commercially available alkaline degreasing aqueous solution at 40 ° C. for 10 minutes, washed with water, and sodium pyrophosphate at 50 ° C. It electrolyzed, supplying with electricity at 2-8 A / dm < 2 > to 30-80 g / L aqueous solution. Next, the cemented carbide base plate is ultrasonically cleaned in pure water, then immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in a range of 5 to 20 A / dm 2 , and subjected to base plating, followed by masking. The tape was peeled off and washed with water.
次いで、外径φ130mm、厚み10mmのPPS樹脂製円盤の一側面に、外径φ123mm、内径φ119mm、深さ1.5mmの溝を形成し、この溝に、長さ1.8mm×幅2mm×厚み1.5mmの永久磁石(信越レアアースマグネット製N32Z、Br=1.14T)を、厚み方向を円盤の深さ方向として、均等間隔で円盤1個あたり105個配列させた後、溝をエポキシ樹脂で埋めて磁石を固定したカバーを作製し、このカバー2枚からなる治具本体で、磁石側を内側にして台板を挟持した。このとき、磁石は台板外周端から台板側面内側方向に1.5mm離れていた。なお、台板外周端から10mmまでの空間内に形成される磁場について磁界解析したところ、磁場強度は16kA/m(0.02T)以上であった。 Next, a groove having an outer diameter of φ123 mm, an inner diameter of φ119 mm, and a depth of 1.5 mm is formed on one side of a PPS resin disk having an outer diameter of φ130 mm and a thickness of 10 mm. The groove has a length of 1.8 mm × width of 2 mm × thickness. After arranging 105 mm permanent magnets (N32Z made by Shin-Etsu rare earth magnet, Br = 1.14T) per disc at equal intervals with the thickness direction being the depth direction of the disc, the grooves were made of epoxy resin. A cover in which the magnet was fixed by being buried was prepared, and the base plate was sandwiched between the two jig covers with the magnet side inside. At this time, the magnet was 1.5 mm away from the outer peripheral edge of the base plate toward the inner side of the base plate side surface. In addition, when the magnetic field analysis was carried out about the magnetic field formed in the space from a base plate outer periphery end to 10 mm, the magnetic field strength was 16 kA / m (0.02T) or more.
予めNiPメッキした質量磁化率χg0.588、平均粒径135μmのダイヤモンド砥粒0.4gを治具と台板とで作られる凹みに全周均等になるように磁気吸引させた。次に、砥粒が磁気吸引された状態のまま、治具ごと50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して電気メッキした後、水洗した。その後、ダイヤモンド砥粒0.4gを磁気吸引させ、上記と同様にメッキして水洗する操作を3度繰り返した。 NiP-plated mass magnetic susceptibility χ g of 0.588 and diamond abrasive grains of 0.4 g having an average particle size of 135 μm were magnetically attracted to a recess made of a jig and a base plate so as to be even all around. Next, while the abrasive grains were magnetically attracted, the entire jig was immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in the range of 5 to 20 A / dm 2 and electroplated, and then washed with water. Thereafter, 0.4 g of diamond abrasive grains were magnetically attracted, and the operation of plating and washing in the same manner as described above was repeated three times.
治具本体を、得られた砥粒層両側面が露出するように、外径φ123mm、厚み10mmのPPS樹脂製円盤に交換して、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して、切り刃部全体を覆うようにメッキ析出させた後、水洗し、治具から取り外して、乾燥した。 The jig body was replaced with a PPS resin disk having an outer diameter of φ123 mm and a thickness of 10 mm so that both sides of the obtained abrasive layer were exposed, and immersed in a 50 ° C. sulfamic acid watt nickel plating solution, After energizing in the range of 20 A / dm 2 to deposit the plating so as to cover the entire cutting blade, it was washed with water, removed from the jig, and dried.
次いで、粒径0.3mmの球状に加工したSn−3Ag合金を、外周切断刃の切り刃部の側面全周に載せ、その状態のまま200℃のオーブンに入れた後、オーブン内部の温度が200℃に到達したのを確認して、250℃に昇温し、250℃で約5分間保った後、加熱を切ってオーブン内で自然冷却した。なお、Sn−3Ag合金の融点は222℃、ポアソン比は0.3である。 Next, the Sn-3Ag alloy processed into a spherical shape with a particle size of 0.3 mm was placed on the entire circumference of the side surface of the cutting edge of the outer peripheral cutting blade, and placed in an oven at 200 ° C. as it was, and then the temperature inside the oven was After confirming that the temperature reached 200 ° C., the temperature was raised to 250 ° C. and maintained at 250 ° C. for about 5 minutes, and then the heating was turned off and the product was naturally cooled in an oven. The melting point of the Sn-3Ag alloy is 222 ° C. and the Poisson's ratio is 0.3.
その後、平面研削盤を用いて、超硬合金台板からの砥粒層のせり出しが片側50μmになるように砥石で研削して砥粒層のせり出しと厚みを整えた後、ワイヤー放電加工して外径を整え、ドレスして、厚み0.4mm、外径129mmの砥粒層(切り刃部)を形成した超硬合金台板外周切断刃を得た。 Then, using a surface grinder, grind with a grindstone so that the protrusion of the abrasive layer from the cemented carbide base plate is 50 μm on one side, and adjust the protrusion and thickness of the abrasive layer, then wire electric discharge machining The outer diameter was adjusted and dressed to obtain a cemented carbide base plate outer peripheral cutting blade having an abrasive layer (cutting blade portion) having a thickness of 0.4 mm and an outer diameter of 129 mm.
[実施例3]
質量百分率でWCが90%、Coが10%の超硬合金を外径φ125mm×内径φ40mm×厚み0.3mmのドーナツ状孔あき円板に加工し、台板とした。
[Example 3]
A cemented carbide having a mass percentage of WC of 90% and Co of 10% was processed into a donut-shaped perforated disk having an outer diameter of φ125 mm, an inner diameter of φ40 mm, and a thickness of 0.3 mm to obtain a base plate.
この台板を外周端から内側1.0mmの部分のみが露出するように粘着テープでマスキングして、市販のアルカリ脱脂水溶液に40℃、10分間浸漬した後、水洗し、50℃のピロリン酸ナトリウム30〜80g/Lの水溶液に2〜8A/dm2で通電しながら電解した。次に、超硬合金台板を純水中で超音波洗浄した後、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して下地メッキした後、マスキングテープを剥がして水洗した。 This base plate is masked with an adhesive tape so that only the inner 1.0 mm portion from the outer peripheral edge is exposed, immersed in a commercially available alkaline degreasing solution at 40 ° C. for 10 minutes, washed with water, and sodium pyrophosphate at 50 ° C. It electrolyzed, supplying with electricity at 2-8 A / dm < 2 > to 30-80 g / L aqueous solution. Next, the cemented carbide base plate is ultrasonically cleaned in pure water, then immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in a range of 5 to 20 A / dm 2 , and subjected to base plating, followed by masking. The tape was peeled off and washed with water.
次いで、実施例1で用いた治具本体で台板を挟持し、予めNiPメッキした質量磁化率χg0.392、平均粒径130μmのダイヤモンド砥粒0.4gを治具と台板とで作られる凹みに全周均等になるように磁気吸引させた。次に、砥粒が磁気吸引された状態のまま、治具ごと40℃のピロリン酸銅メッキ液に浸漬し、1〜20A/dm2の範囲で通電して電気メッキした後、水洗し、治具から取り外して、乾燥した。 Next, the base plate is sandwiched between the jig main bodies used in Example 1, and 0.4 g of diamond abrasive grains having a mass magnetic susceptibility χg of 0.392 and an average grain size of 130 μm preliminarily NiP-plated are made of the jig and the base plate. Magnetic attraction was applied to the dent so that the entire circumference was even. Next, with the abrasive grains magnetically attracted, the entire jig was immersed in a copper pyrophosphate plating solution at 40 ° C., energized and electroplated in the range of 1 to 20 A / dm 2 , washed with water, and then cured. Removed from the ingredients and dried.
次いで、φ1.0mmのワイヤー状に加工したSn−Pb合金を、外周切断刃の切り刃部の側面にリング状に載せ、その状態のまま200℃のオーブンに入れた後、オーブン内部の温度が200℃に到達したのを確認して、250℃に昇温し、250℃で約5分間保った後、加熱を切ってオーブン内で自然冷却した。なお、Sn−Pb合金の融点は185℃、ポアソン比は0.38である。 Next, the Sn—Pb alloy processed into a wire shape of φ1.0 mm was placed in a ring shape on the side surface of the cutting edge portion of the outer peripheral cutting blade, and put in an oven at 200 ° C. as it was. After confirming that the temperature reached 200 ° C., the temperature was raised to 250 ° C. and maintained at 250 ° C. for about 5 minutes, and then the heating was turned off and the product was naturally cooled in an oven. Note that the melting point of the Sn—Pb alloy is 185 ° C. and the Poisson's ratio is 0.38.
その後、平面研削盤を用いて、超硬合金台板からの砥粒層のせり出しが片側50μmになるように砥石で研削して砥粒層のせり出しと厚みを整えた後、ワイヤー放電加工して外径を整え、ドレスして、厚み0.4mm、外径126mmの砥粒層(切り刃部)を形成した超硬合金台板外周切断刃を得た。 Then, using a surface grinder, grind with a grindstone so that the protrusion of the abrasive layer from the cemented carbide base plate is 50 μm on one side, and adjust the protrusion and thickness of the abrasive layer, then wire electric discharge machining The outer diameter was adjusted and dressed to obtain a cemented carbide base plate outer peripheral cutting blade having an abrasive layer (cutting blade portion) having a thickness of 0.4 mm and an outer diameter of 126 mm.
[実施例4]
質量百分率でWCが95%、Coが5%の超硬合金を外径φ125mm×内径φ40mm×厚み0.3mmのドーナツ状孔あき円板に加工し、台板とした。この台板のヤング率は580GPa、飽和磁化は40kA/m(0.05T)であった。
[Example 4]
A cemented carbide having a mass percentage of WC of 95% and Co of 5% was processed into a donut-shaped perforated disk having an outer diameter of φ125 mm, an inner diameter of φ40 mm, and a thickness of 0.3 mm to obtain a base plate. The base plate had a Young's modulus of 580 GPa and a saturation magnetization of 40 kA / m (0.05 T).
この台板を外周端から内側1.0mmの部分のみが露出するように粘着テープでマスキングして、市販のアルカリ脱脂水溶液に40℃、10分間浸漬した後、水洗し、50℃のピロリン酸ナトリウム30〜80g/Lの水溶液に2〜8A/dm2で通電しながら電解した。次に、超硬合金台板を純水中で超音波洗浄した後、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して下地メッキした後、マスキングテープを剥がして水洗した。 This base plate is masked with an adhesive tape so that only the inner 1.0 mm portion from the outer peripheral edge is exposed, immersed in a commercially available alkaline degreasing solution at 40 ° C. for 10 minutes, washed with water, and sodium pyrophosphate at 50 ° C. It electrolyzed, supplying with electricity at 2-8 A / dm < 2 > to 30-80 g / L aqueous solution. Next, the cemented carbide base plate is ultrasonically cleaned in pure water, then immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in a range of 5 to 20 A / dm 2 , and subjected to base plating, followed by masking. The tape was peeled off and washed with water.
次いで、実施例1で用いた治具本体で台板を挟持し、予めNiPメッキした質量磁化率χg0.392、平均粒径130μmのダイヤモンド砥粒0.3gを治具と台板とで作られる凹みに全周均等になるように磁気吸引させた。次に、砥粒が磁気吸引された状態のまま、治具ごと80℃の無電解ニッケル・リン合金メッキ液に浸漬し無電解メッキした後、水洗した。その後、ダイヤモンド砥粒0.3gを磁気吸引させ、上記と同様にメッキして水洗する操作を2度繰り返し、治具から取り外して、乾燥した。 Next, the base plate is sandwiched between the jig main bodies used in Example 1, and 0.3 g of diamond abrasive grains having a mass magnetic susceptibility χg of 0.392 and an average grain size of 130 μm preliminarily NiP-plated are made of the jig and the base plate. Magnetic attraction was applied to the dent so that the entire circumference was even. Next, with the abrasive grains being magnetically attracted, the entire jig was immersed in an electroless nickel / phosphorous alloy plating solution at 80 ° C. to perform electroless plating, and then washed with water. Thereafter, 0.3 g of diamond abrasive grains were magnetically attracted, and the operation of plating and washing in the same manner as described above was repeated twice, removed from the jig, and dried.
次いで、φ1.0mmのワイヤー状に加工したSn−3Ag−0.5Cu合金を、外周切断刃の切り刃部の側面にリング状に載せ、その状態のまま200℃のオーブンに入れた後、オーブン内部の温度が200℃に到達したのを確認して、250℃に昇温し、250℃で約5分間保った後、加熱を切ってオーブン内で自然冷却した。 Next, a Sn-3Ag-0.5Cu alloy processed into a wire shape of φ1.0 mm was placed in a ring shape on the side surface of the cutting edge portion of the outer peripheral cutting blade, and put in an oven at 200 ° C. in that state, then the oven After confirming that the internal temperature reached 200 ° C., the temperature was raised to 250 ° C. and kept at 250 ° C. for about 5 minutes, and then the heating was turned off and the product was naturally cooled in an oven.
その後、平面研削盤を用いて、超硬合金台板からの砥粒層のせり出しが片側50μmになるように砥石で研削して砥粒層のせり出しと厚みを整えた後、ワイヤー放電加工して外径を整え、ドレスして、厚み0.4mm、外径127mmの砥粒層(切り刃部)を形成した超硬合金台板外周切断刃を得た。 Then, using a surface grinder, grind with a grindstone so that the protrusion of the abrasive layer from the cemented carbide base plate is 50 μm on one side, and adjust the protrusion and thickness of the abrasive layer, then wire electric discharge machining The outer diameter was adjusted and dressed to obtain a cemented carbide base plate outer peripheral cutting blade having an abrasive layer (cutting blade portion) having a thickness of 0.4 mm and an outer diameter of 127 mm.
[比較例1]
質量百分率でWCが90%、Coが10%の超硬合金を外径φ125mm×内径φ40mm×厚み0.3mmのドーナツ状孔あき円板に加工し、台板とした。
[Comparative Example 1]
A cemented carbide having a mass percentage of WC of 90% and Co of 10% was processed into a donut-shaped perforated disk having an outer diameter of φ125 mm, an inner diameter of φ40 mm, and a thickness of 0.3 mm to obtain a base plate.
この台板を外周端から内側1.0mmの部分のみが露出するように粘着テープでマスキングして、市販のアルカリ脱脂水溶液に40℃、10分間浸漬した後、水洗し、50℃のピロリン酸ナトリウム30〜80g/Lの水溶液に2〜8A/dm2で通電しながら電解した。次に、超硬合金台板を純水中で超音波洗浄した後、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して下地メッキした後、マスキングテープを剥がして水洗した。 This base plate is masked with an adhesive tape so that only the inner 1.0 mm portion from the outer peripheral edge is exposed, immersed in a commercially available alkaline degreasing solution at 40 ° C. for 10 minutes, washed with water, and sodium pyrophosphate at 50 ° C. It electrolyzed, supplying with electricity at 2-8 A / dm < 2 > to 30-80 g / L aqueous solution. Next, the cemented carbide base plate is ultrasonically cleaned in pure water, then immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in a range of 5 to 20 A / dm 2 , and subjected to base plating, followed by masking. The tape was peeled off and washed with water.
次いで、実施例1で用いた治具本体で台板を挟持し、予めNiPメッキした質量磁化率χg0.392、平均粒径130μmのダイヤモンド砥粒0.4gを治具と台板とで作られる凹みに全周均等になるように磁気吸引させた。次に、砥粒が磁気吸引された状態のまま、治具ごと50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して電気メッキした後、水洗した。その後、ダイヤモンド砥粒0.4gを磁気吸引させ、上記と同様にメッキして水洗する操作を再度繰り返した。 Next, the base plate is sandwiched between the jig main bodies used in Example 1, and 0.4 g of diamond abrasive grains having a mass magnetic susceptibility χg of 0.392 and an average grain size of 130 μm preliminarily NiP-plated are made of the jig and the base plate. Magnetic attraction was applied to the dent so that the entire circumference was even. Next, while the abrasive grains were magnetically attracted, the entire jig was immersed in a sulfamic acid watt nickel plating solution at 50 ° C., energized in the range of 5 to 20 A / dm 2 and electroplated, and then washed with water. Thereafter, 0.4 g of diamond abrasive grains were magnetically attracted, and the operation of plating and washing in the same manner as described above was repeated again.
治具本体を、得られた砥粒層両側面が露出するように、外径φ123mm、厚み10mmのPPS樹脂製円盤に交換して、50℃のスルファミン酸ワットニッケルメッキ液に浸漬し、5〜20A/dm2の範囲で通電して、切り刃部全体を覆うようにメッキ析出させた後、水洗し、治具から取り外して、乾燥した。 The jig body was replaced with a PPS resin disk having an outer diameter of φ123 mm and a thickness of 10 mm so that both sides of the obtained abrasive layer were exposed, and immersed in a 50 ° C. sulfamic acid watt nickel plating solution, After energizing in the range of 20 A / dm 2 to deposit the plating so as to cover the entire cutting blade, it was washed with water, removed from the jig, and dried.
その後、平面研削盤を用いて、超硬合金台板からの砥粒層のせり出しが片側50μmになるように砥石で研削して砥粒層のせり出しと厚みを整えた後、ワイヤー放電加工して外径を整え、ドレスして、厚み0.4mm、外径127mmの砥粒層(切り刃部)を形成した超硬合金台板外周切断刃を得た。 Then, using a surface grinder, grind with a grindstone so that the protrusion of the abrasive layer from the cemented carbide base plate is 50 μm on one side, and adjust the protrusion and thickness of the abrasive layer, then wire electric discharge machining The outer diameter was adjusted and dressed to obtain a cemented carbide base plate outer peripheral cutting blade having an abrasive layer (cutting blade portion) having a thickness of 0.4 mm and an outer diameter of 127 mm.
表1に、実施例1〜4及び比較例1の超硬合金台板外周切断刃の製作歩留まりを示す。ここで、メッキ歩留まりとは、メッキによって砥粒を固着させる工程まで実施した総数(各15枚)のうち、砥粒の脱落や砥粒層の欠損が無いものを良品として、このメッキ良品の割合を100分率で示したものであり、加工歩留まりとは、得られたメッキ良品に対して、メッキ後の工程をドレスまで実施し、砥粒層の欠損が無いものを良品として、メッキ良品の総数に対する加工良品の割合を100分率で示したものである。また、総合歩留まりとは、メッキ歩留まりと加工歩留まりとの積であり、外周切断刃の製作に供した台板に対する、外周切断刃の完成品としての良品の歩留まりを意味する。 Table 1 shows the production yield of the cemented carbide base plate outer peripheral cutting blades of Examples 1 to 4 and Comparative Example 1. Here, the plating yield is the ratio of non-defective plating to the non-defective ones that are free of abrasive grains and missing the abrasive layer of the total number (15 each) that have been applied until the step of fixing the abrasive grains by plating. The processing yield is obtained by performing the post-plating process up to dressing on the obtained non-plated product, and treating the non-degraded abrasive layer as a non-defective product. The ratio of non-processed products to the total number is shown in 100 minutes. The overall yield is the product of the plating yield and the processing yield, and means the yield of non-defective products as a finished product of the outer peripheral cutting blade with respect to the base plate used for manufacturing the outer peripheral cutting blade.
表1から、比較例1に比べ、実施例の歩留まりが良好であること、特に、メッキ後の加工における歩留まりが良好であり、本発明の製造方法が生産性の点でも優れていることがわかる。 From Table 1, it can be seen that the yield of the example is better than that of Comparative Example 1, in particular, the yield in the processing after plating is good, and the production method of the present invention is also excellent in terms of productivity. .
図6には、超硬合金台板外周切断刃を用いて希土類焼結磁石を切断する操作を実施したときの、磁石の切断精度を評価した結果を示す。切断精度の評価方法は以下のとおりである。 In FIG. 6, the result of having evaluated the cutting precision of a magnet when the operation which cut | disconnects a rare earth sintered magnet using a cemented carbide base plate outer periphery cutting blade is implemented. The evaluation method of cutting accuracy is as follows.
まず、実施例1〜4及び比較例1の超硬合金台板外周切断刃を各々2枚ずつ計10枚、間隔1.5mmで、台板の穴に回転軸を挿通して組み上げたマルチ切断刃とした。このマルチ切断刃により、回転数4,500rpm、送り速度30mm/minで、幅(W)40mm×長さ(L)130mm×高さ(H)20mmのNd−Fe−B系希土類焼結磁石から、W40mm×L(=厚み(t))1.5mm×H20mmの磁石を1,010回切り出し、実施例及び比較例の各々の2枚の外周切断刃の間で切断されたものを、評価対象の切断磁石とした。切断磁石について、切断1枚目から100枚毎を寸法計測サイクル(全10サイクル)とし、各サイクルにおいて最初の10枚分(即ち、最初のサイクルが1〜10枚目、次が101〜110枚目、最後が1,001〜1,010枚目)をサンプリングした。各サイクルの10枚について、1枚毎に中央部1点と隅部4点の合計5点の厚み(t)をマイクロメーターで測定し、5点のうちの最大値と最小値の差を切断精度(μm)として、10枚の切断精度の平均値を算出した。各寸法計測サイクルにおけるこの平均値をプロットしたものが、図6である。 First, the multi-cutting which assembled the cemented carbide base plate outer periphery cutting blades of Examples 1 to 4 and Comparative Example 1 by inserting two rotary shafts through the holes of the base plate, with a total of 10 pieces, each with a spacing of 1.5 mm. A blade was used. From this multi-cutting blade, an Nd-Fe-B rare earth sintered magnet having a rotation speed of 4,500 rpm, a feed rate of 30 mm / min, and a width (W) of 40 mm, a length (L) of 130 mm, and a height (H) of 20 mm. W40 mm × L (= thickness (t)) 1.5 mm × H 20 mm magnet cut out 1,010 times and cut between each of the two outer peripheral cutting blades of the examples and comparative examples. This was a cutting magnet. With respect to the cutting magnet, every 100 sheets from the first cut are defined as a dimension measurement cycle (10 cycles in total). The first and the last one were sampled from 1,001 to 1,010 sheets). For each of the 10 sheets in each cycle, the thickness (t) of a total of 5 points (1 in the center and 4 in the corners) is measured with a micrometer, and the difference between the maximum value and the minimum value among the 5 points is cut. As the accuracy (μm), an average value of the cutting accuracy of 10 sheets was calculated. FIG. 6 is a plot of this average value in each dimension measurement cycle.
比較例1の場合は、寸法計測3サイクル以降(切断枚数301枚目以降)、切断精度が悪くなっているが、実施例1〜4の場合は10サイクル目(切断枚数1,010枚目まで)まで、切断精度が落ちることがなく、本発明の超硬合金台板外周切断刃の使用耐久性が高いことがわかる。 In the case of Comparative Example 1, the cutting accuracy is worse after the third cycle of dimension measurement (after the 301th cut), but in the case of Examples 1 to 4, the 10th cycle (up to the 1,010th cut) ) Until the cutting accuracy does not drop, and it can be seen that the use durability of the cemented carbide base plate outer peripheral cutting blade of the present invention is high.
また、得られた外周切断刃の弾性(柔軟性)を評価した結果を図7に示す。ここでは、外周切断刃の刃先の圧縮剪断応力を評価した。各々の例の外周切断刃において、刃先の面取りをR又はCで0.1以上に整えた後、超硬合金台板の外周から外方に0.3mm離れた位置において、切り刃部を、接触部の長さが(切り刃部の突き出し量−0.3mm)、幅が10mmの圧子で、外周切断刃の回転軸方向(切り刃部の厚み方向)に線速1mm/minで押圧したときの、圧子の移動量に対する応力を、島津製作所 強度試験機 AG−1を用いて測定した。押圧は、切り刃部が破断するまで継続した。この測定においては、外周切断刃を水平に切り刃部のみ露出する厚み5mmの円形鉄板で外周切断刃を上下から挟む支持治具を用いて、押圧時に台板部分が反らないように保持した。 Moreover, the result of having evaluated the elasticity (flexibility) of the obtained outer periphery cutting blade is shown in FIG. Here, the compression shear stress of the cutting edge of the outer peripheral cutting blade was evaluated. In the outer peripheral cutting blade of each example, after the chamfering of the cutting edge is adjusted to 0.1 or more with R or C, the cutting blade portion is positioned at a position 0.3 mm away from the outer periphery of the cemented carbide base plate, The length of the contact part (the protruding amount of the cutting edge part -0.3 mm) and the indenter having a width of 10 mm were pressed at a linear speed of 1 mm / min in the rotation axis direction of the outer peripheral cutting blade (thickness direction of the cutting edge part). The stress with respect to the amount of movement of the indenter was measured using Shimadzu Corporation strength tester AG-1. The pressing was continued until the cutting edge was broken. In this measurement, a support jig that sandwiches the outer peripheral cutting blade from above and below with a circular iron plate having a thickness of 5 mm that exposes only the cutting blade portion horizontally is held so that the base plate portion does not warp when pressed. .
図7に示されるように、いずれの例においても、圧子の移動量が大きくなると、グラフが直線性を示す領域、即ち、圧子の移動量と応力とが比例する領域が確認された。この直線領域の傾き(応力/圧子の移動量)を算出した結果を表2に示す。 As shown in FIG. 7, in any of the examples, when the amount of movement of the indenter increases, a region where the graph shows linearity, that is, a region where the amount of movement of the indenter is proportional to the stress is confirmed. Table 2 shows the result of calculating the slope (stress / movement of the indenter) of this linear region.
上述した切断による評価の際、実施例の外周切断刃を用いて切断して得られた磁石片は、いずれも切断面の外観が良好であったが、比較例の外周切断刃を用いて切断して得られた磁石片では、3サイクル以降(切断枚数301枚目以降)において、切断面に切り跡(段差)が存在するサンプルが発生した。このように、上述した外周切断刃の弾性(柔軟性)評価により示される圧子の移動量と応力と傾きが大きすぎず、ある程度柔軟性をもった本発明の外周切断刃が、切断面に切り跡を残すことなく、高い寸法精度の磁石を切り出すことができることが確認された。 In the evaluation by the above-described cutting, the magnet pieces obtained by cutting using the outer peripheral cutting blades of the examples all had good cutting surface appearance, but were cut using the outer peripheral cutting blades of the comparative examples. In the magnet piece obtained in this way, a sample having a cut (step) on the cut surface was generated after 3 cycles (after 301 sheets to be cut). Thus, the movement amount, stress, and inclination of the indenter shown by the above-described evaluation of the elasticity (flexibility) of the outer cutting blade are not too large, and the outer cutting blade of the present invention having a certain degree of flexibility cuts into the cutting surface. It was confirmed that a magnet with high dimensional accuracy can be cut out without leaving a trace.
以上の結果から、本発明の超硬合金台板外周切断刃により切断することによって、切断後の仕上げ処理をすることなく、希土類焼結磁石等の被作物を、切断のみで高精度に仕上げることができ、被作物を高い寸法精度で提供することが可能となる。 From the above results, by cutting with the cutting edge of the cemented carbide base plate of the present invention, the workpiece such as rare earth sintered magnets can be finished with high precision only by cutting, without performing finishing treatment after cutting. Therefore, it becomes possible to provide the crop with high dimensional accuracy.
1、10 台板
12 内穴
20 切り刃部
22a、22b 挟持部
24 金属結合材
26 砥粒
50 治具本体
52 カバー
54 永久磁石
56 電気メッキ用陰極体
58 支持棒
60 ジョイント
62 エンドキャップ
64 隙間
DESCRIPTION OF SYMBOLS 1, 10 Base plate 12 Inner hole 20 Cutting edge part 22a, 22b Clamping part 24 Metal bonding material 26 Abrasive grain 50 Jig body 52 Cover 54 Permanent magnet 56 Cathode body for electroplating 58 Support bar 60 Joint 62 End cap 64 Crevice
Claims (7)
該永久磁石が形成する磁場により、予め磁性体をコーティングしてなるダイヤモンド砥粒及び/又はcBN砥粒を上記台板の外周縁部近傍に磁気的に吸引固定し、
該吸引固定を保った状態で、電気メッキ又は無電解メッキにより、上記砥粒間及び上記砥粒と台板との間を連結して上記台板外周端部に砥粒を固着させて切り刃部を形成し、
上記砥粒間及び上記砥粒と台板との間に存する空隙に、融点が350℃以下の金属及び/又は合金を含浸することを特徴とする超硬合金台板外周切断刃の製造方法。 It is made of a cemented carbide with a Young's modulus of 450-700 GPa and is in close proximity to the outer peripheral edge of a circular ring-shaped thin plate base plate having an outer diameter of 80-200 mm, an inner diameter of 30-80 mm, and a thickness of 0.1-1.0 mm. A magnet,
By magnetic field formed by the permanent magnet, diamond abrasive grains and / or cBN abrasive grains, which are pre-coated with a magnetic material, are magnetically attracted and fixed in the vicinity of the outer peripheral edge of the base plate,
With the suction and fixing maintained, the cutting blade is formed by connecting the abrasive grains and between the abrasive grains and the base plate by electroplating or electroless plating to fix the abrasive grains to the outer peripheral edge of the base plate. Forming part,
A method for producing a cemented carbide base plate outer peripheral cutting blade, comprising impregnating a gap between the abrasive grains and between the abrasive grains and the base plate with a metal and / or alloy having a melting point of 350 ° C. or lower.
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US9666547B2 (en) | 2002-10-08 | 2017-05-30 | Honeywell International Inc. | Method of refining solder materials |
US10655038B2 (en) | 2016-10-25 | 2020-05-19 | 3M Innovative Properties Company | Method of making magnetizable abrasive particles |
US10774251B2 (en) | 2016-10-25 | 2020-09-15 | 3M Innovative Properties Company | Functional abrasive particles, abrasive articles, and methods of making the same |
US10947432B2 (en) | 2016-10-25 | 2021-03-16 | 3M Innovative Properties Company | Magnetizable abrasive particle and method of making the same |
US11072732B2 (en) | 2016-10-25 | 2021-07-27 | 3M Innovative Properties Company | Magnetizable abrasive particles and abrasive articles including them |
US11253972B2 (en) | 2016-10-25 | 2022-02-22 | 3M Innovative Properties Company | Structured abrasive articles and methods of making the same |
US11484990B2 (en) | 2016-10-25 | 2022-11-01 | 3M Innovative Properties Company | Bonded abrasive wheel and method of making the same |
US11597860B2 (en) | 2016-10-25 | 2023-03-07 | 3M Innovative Properties Company | Magnetizable abrasive particle and method of making the same |
Citations (2)
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JPH08150568A (en) * | 1994-11-30 | 1996-06-11 | Alpha- Daiyamondo Kogyo Kk | Flexible diamond coated polishing object |
JP2010260124A (en) * | 2009-05-01 | 2010-11-18 | Shin-Etsu Chemical Co Ltd | Method of manufacturing peripheral cutting blade and tool for manufacturing the same |
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US4923490A (en) * | 1988-12-16 | 1990-05-08 | General Electric Company | Novel grinding wheels utilizing polycrystalline diamond or cubic boron nitride grit |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH08150568A (en) * | 1994-11-30 | 1996-06-11 | Alpha- Daiyamondo Kogyo Kk | Flexible diamond coated polishing object |
JP2010260124A (en) * | 2009-05-01 | 2010-11-18 | Shin-Etsu Chemical Co Ltd | Method of manufacturing peripheral cutting blade and tool for manufacturing the same |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9666547B2 (en) | 2002-10-08 | 2017-05-30 | Honeywell International Inc. | Method of refining solder materials |
US10655038B2 (en) | 2016-10-25 | 2020-05-19 | 3M Innovative Properties Company | Method of making magnetizable abrasive particles |
US10774251B2 (en) | 2016-10-25 | 2020-09-15 | 3M Innovative Properties Company | Functional abrasive particles, abrasive articles, and methods of making the same |
US10947432B2 (en) | 2016-10-25 | 2021-03-16 | 3M Innovative Properties Company | Magnetizable abrasive particle and method of making the same |
US11072732B2 (en) | 2016-10-25 | 2021-07-27 | 3M Innovative Properties Company | Magnetizable abrasive particles and abrasive articles including them |
US11253972B2 (en) | 2016-10-25 | 2022-02-22 | 3M Innovative Properties Company | Structured abrasive articles and methods of making the same |
US11484990B2 (en) | 2016-10-25 | 2022-11-01 | 3M Innovative Properties Company | Bonded abrasive wheel and method of making the same |
US11597860B2 (en) | 2016-10-25 | 2023-03-07 | 3M Innovative Properties Company | Magnetizable abrasive particle and method of making the same |
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JP5975138B2 (en) | 2016-08-23 |
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