JPH08290362A - Grinding wheel for cutting and its manufacture - Google Patents
Grinding wheel for cutting and its manufactureInfo
- Publication number
- JPH08290362A JPH08290362A JP11939095A JP11939095A JPH08290362A JP H08290362 A JPH08290362 A JP H08290362A JP 11939095 A JP11939095 A JP 11939095A JP 11939095 A JP11939095 A JP 11939095A JP H08290362 A JPH08290362 A JP H08290362A
- Authority
- JP
- Japan
- Prior art keywords
- grinding wheel
- cutting
- abrasive grain
- abrasive
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は主として切断砥石車に関
し、更に詳しくは、側面に凹凸を有し、砥粒密度の大な
る部分と小なる部分を有する目詰まりのない砥石車に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a cutting wheel, and more particularly to a grinding wheel which has irregularities on its side surface and has a high abrasive grain density portion and a low abrasive grain density portion.
【０００２】[0002]
【従来の技術】従来の切断砥石や平砥石等の砥石車は、
炭化珪素、金剛砂等よりなる砥粒を結合剤と共に円盤状
に圧縮成型したのち、熱処理して結合剤を硬化して製造
されている。砥石車の用途に応じて、各種粒度の砥粒を
適宜配合して、これに液状又は粉状のフェノール樹脂等
よりなる結合剤を配合する。図１に示すように円筒１の
底に円板状の下型２を嵌めて、その上に砥粒３を均一に
均して入れ、円板状の上型４を嵌合し、油圧プレス等に
より加圧して全体が均一な円盤状になるように成型した
のち、焼成を行っている。この成型の際、円盤の両面又
は中間層にガラス繊維等よりなる補強布を挟んで、プレ
スをする。2. Description of the Related Art Conventional grinding wheels such as cutting wheels and flat wheels
It is manufactured by compression-molding abrasive grains made of silicon carbide, gold sand, or the like together with a binder into a disk shape, and then heat-treating the binder. Abrasive grains of various particle sizes are appropriately blended according to the application of the grinding wheel, and a binder made of a liquid or powdery phenolic resin or the like is blended therein. As shown in FIG. 1, a disk-shaped lower mold 2 is fitted on the bottom of a cylinder 1, abrasive grains 3 are evenly placed on the bottom, and a disk-shaped upper mold 4 is fitted, and a hydraulic press is used. Then, it is pressed by a method such as molding to form a uniform disk shape, and then fired. At the time of this molding, a reinforcing cloth made of glass fiber or the like is sandwiched between both sides of the disk or the intermediate layer and pressed.
【０００３】上記従来の砥石車は、金属等の切断又は切
削の際、しばしば目詰まりを起こし、切れ味が悪化し、
又摩擦熱により砥石及び切削物が高温となり、砥石の寿
命が低下するという問題があった。特にアルミニウム、
真鍮等の軟質金属を研削するときには、目詰まりが甚だ
しく、しばしば目直しをする必要があり、またステンレ
ス鋼を切削する場合は、切削物が高温になり変色する虞
がある。The above conventional grinding wheel often causes clogging during cutting or cutting of metal or the like, resulting in poor sharpness.
Further, there is a problem that the friction stone heats the grindstone and the cut object to a high temperature, which shortens the life of the grindstone. Especially aluminum,
When grinding a soft metal such as brass, it is severely clogged and often needs to be re-dressed. When cutting stainless steel, the cutting material may become hot and discolor.
【０００４】そこで特開昭４９−１３２６８８号には孔
容量（多孔度）が小さく比較的硬質の扇形研削部材と、
孔容量（多孔度）が大きく比較的軟質の扇形研削部材を
交互に配設して砥石車を構成することにより、砥石車の
目詰まりを防止し、研削効率を高めることが提案されて
いる。この多孔度が小さく比較的硬質の扇形研削部材
と、多孔度が大きく比較的軟質の扇形研削部材を交互に
配設した砥石車は、その軟質と硬質の扇形研削部材をそ
れぞれ別個に、砥粒を成型、焼成してセグメントとして
製作した後、これらを交互に配列して互いに接着等によ
り円盤状に組立てたものであって、その製造工程が極め
て複雑であり、扇形のセグメント同志の接着強度が弱
く、研削作業中にその砥石車のセグメントの接着部分か
ら欠けたり割れたりする虞があった。Therefore, Japanese Patent Application Laid-Open No. Sho 49-132688 discloses a relatively hard fan-shaped grinding member having a small pore volume (porosity).
It has been proposed to prevent grinding of the grinding wheel by increasing the grinding efficiency by alternately arranging relatively soft fan-shaped grinding members having a large pore volume (porosity) to form a grinding wheel. This grinding wheel in which a relatively hard fan-shaped grinding member having a small porosity and a relatively soft fan-shaped grinding member having a large porosity are alternately arranged, the soft and hard fan-shaped grinding members are individually provided with abrasive grains. After being molded and fired to make segments, these are alternately arranged and assembled into a disc shape by bonding or the like, the manufacturing process is extremely complicated, and the adhesive strength of the fan-shaped segments is It was weak and could be chipped or cracked from the bonded portion of the grinding wheel segment during the grinding operation.
【０００５】そこで、本発明者は特公平３−６７８３４
号に示すように金型で砥石車を成型する際、図１の円筒
１内の下型２上に砥粒３を均して入れ、一定の深さの砥
粒層を形成した後、図２に示すような扇形の凹凸部分を
下面に有する円板状の押し型１７を押し付けて、その砥
粒層の上面に凹凸を形成した後、押し型１７を取り除
き、代わりに平坦な下面を有する円板状の上型４を置い
てプレスすると、凹凸形状を形成した状態では、砥粒層
の凸部は砥粒層の厚みが大きく、凹部は厚みが小さいた
め、これ全体を均一な厚みにプレスすると、砥粒層の凸
部であった部分は圧縮率が大で砥粒密度が大きくなり、
砥粒層の凹部であった部分は圧縮率が小で砥粒密度が小
さくなり、砥粒密度の大なる扇形部分と小なる扇形部分
が交互に並んだ砥石車を同時に成型することができるこ
とを示した。Therefore, the inventor of the present invention has disclosed the Japanese Patent Publication No. 3-67834.
As shown in FIG. 1, when molding a grinding wheel with a die, the abrasive grains 3 are evenly put on the lower mold 2 in the cylinder 1 of FIG. 1 to form an abrasive grain layer having a constant depth. After pressing a disk-shaped pressing die 17 having a fan-shaped concavo-convex portion on the lower surface to form concavities and convexities on the upper surface of the abrasive grain layer, the pressing die 17 is removed and a flat lower surface is provided instead. When the disc-shaped upper die 4 is placed and pressed, in the state where the irregular shape is formed, the convex portion of the abrasive grain layer has a large thickness of the abrasive grain layer and the concave portion has a small thickness. When pressed, the portion that was the convex portion of the abrasive grain layer has a high compressibility and a large abrasive grain density,
The recessed portion of the abrasive grain layer has a low compressibility and a low abrasive grain density, and it is possible to simultaneously form a grinding wheel in which fan-shaped portions having a large abrasive grain density and fan-shaped portions having a small abrasive grain density are alternately arranged. Indicated.
【０００６】しかしその砥石車はその製造工程におい
て、金型内の砥粒層表面に凹凸形状を形成するのはかな
り困難である。即ち砥粒層上面に扇形の凹凸部分を下面
に有する円板状の押し型を押し付けて、砥粒層の上面に
凹凸を形成した後、プレスしたときに砥石車に扇形状に
はっきりと砥粒密度の差を生じさせるためには、砥粒層
の上面に凹凸形状を形成した状態では凹部も凸部もでき
るだけ均一な砥粒密度である必要がある。そうすること
によって初めて、砥粒層の厚い凸部が砥粒層の薄い凹部
と同じ厚さの円盤状にプレスされる結果、砥粒密度の差
が生ずるのである。押し型を押し付けて、砥粒層の上面
に凹凸を形成したときに、凹部も凸部もできるだけ均一
な砥粒密度にするためには、結合剤を配合した砥粒相互
の粘着性が少なく、砥粒が流動しやすい粉体である必要
がある。一方上面に凹凸を形成した砥粒層を平板状上型
４でプレスする際に、砥粒層上面に形成されている凹凸
形状をできるだけ崩さないようにして、そのまま下方に
圧縮する必要があり、このためには砥粒は少し粘着性が
あって流動し難い粉体である方が望ましい。この砥粒の
流動性に対する相反する要求を満たすのは困難であり、
平板状上型４でプレスする際に砥粒層上面の凹凸形状の
一部、凸部の端の部分が崩れ易く、成型した砥石車の各
部に明確な境界を隔てて砥粒密度の差を生じさせるのが
困難である。However, in the manufacturing process of the grinding wheel, it is quite difficult to form an uneven shape on the surface of the abrasive grain layer in the mold. That is, a disc-shaped pressing die having a fan-shaped uneven portion on the lower surface is pressed against the upper surface of the abrasive grain layer to form unevenness on the upper surface of the abrasive grain layer, and when pressed, the abrasive wheel is clearly formed into a fan shape on the grinding wheel. In order to cause a difference in density, it is necessary that the recesses and the projections have as uniform an abrasive grain density as possible in the state where the upper surface of the abrasive grain layer is provided with an uneven shape. Only by doing so, the thick convex portions of the abrasive grain layer are pressed into a disk shape having the same thickness as the thin concave portions of the abrasive grain layer, resulting in a difference in the abrasive grain density. When the pressing die is pressed to form irregularities on the upper surface of the abrasive grain layer, in order to make the concave and convex portions as uniform as possible in the abrasive grain density, the mutual adhesiveness of the abrasive grains containing the binder is small, It is necessary that the abrasive grains be a powder that easily flows. On the other hand, when pressing the abrasive grain layer having the irregularities formed on the upper surface with the flat plate-shaped upper die 4, it is necessary to keep the irregularities formed on the upper surface of the abrasive grain layer as small as possible, and compress it downward as it is. For this purpose, it is desirable that the abrasive grains be a powder that is a little sticky and hardly flows. It is difficult to meet the conflicting requirements for the fluidity of this abrasive grain,
When pressing with the flat plate-shaped upper die 4, a part of the uneven shape of the upper surface of the abrasive grain layer and the end portion of the convex portion are likely to collapse, and the difference in the abrasive grain density is separated by clear boundaries between the parts of the molded grinding wheel. Difficult to cause.
【０００７】そこで本発明者は特願平３−２２５０５６
号において、オフセット形砥石車を製造する際に、円筒
状金型内に比較的流動性の小さい配合砥粒を均一に均
し、その砥粒層の上に下面に凹凸形状を有する押し型を
押し付けて、その押し型をそのままプレス用上型４とし
てプレスすると、プレスする際、砥粒は水平方向に移動
せず、そのまま垂直方向に圧縮されるため、最終的に成
型された砥石車の厚みの薄い部分は砥粒の圧縮率が大で
砥粒密度が大きく、砥石車の厚みの厚い部分は砥粒の圧
縮率が小で砥粒密度が小さくなり、砥粒密度の大なる部
分と小なる部分を明確に区画して形成することができる
こと、この方法は砥石車の製造が容易であり、そのよう
にして製造されたオフセット形砥石車は極めて目詰まり
を起こし難く、切削速度が優れていることを開示した。Therefore, the inventor of the present invention has filed Japanese Patent Application No. 3-225056.
In manufacturing the offset type grinding wheel, the compound abrasive grains having a relatively small fluidity are uniformly leveled in the cylindrical die, and a pressing die having an irregular shape on the lower surface is formed on the abrasive grain layer. When pressing and pressing the pressing die as it is as the upper die 4 for pressing, the abrasive grains do not move in the horizontal direction but are compressed in the vertical direction as they are, so that the thickness of the finally formed grinding wheel is reduced. The thin portion of the wheel has a high compression rate of the abrasive grains and a high abrasive grain density, and the thick portion of the grinding wheel has a low compression rate of the abrasive grains and a low abrasive grain density. Being able to clearly divide the part to be formed, this method makes it easy to manufacture a grinding wheel, and the offset grinding wheel manufactured in this way is extremely unlikely to cause clogging and has an excellent cutting speed. I disclosed that.
【０００８】又本発明者は特願平６−２８００６２号に
おいて、オフセット形砥石車の切削面に波型の凹凸を有
し、該波型は該砥石車の中心部から外周部に向って多数
の波頭線が略放射状方向に延び且つ該砥石車の中心と同
心の同心円に沿った断面における砥石車表面の形状が波
状をなす波型であって、該波型の凸部の砥石車内部の砥
粒密度が小さく、該波形の凹部の砥石車内部の砥粒密度
が大きく形成したオフセット形砥石車を開示した。In addition, in the Japanese Patent Application No. 6-280062, the present inventor has corrugated irregularities on the cutting surface of an offset type grinding wheel, and the corrugations are numerous from the central portion of the grinding wheel toward the outer peripheral portion. The wavy line extends in a substantially radial direction and has a wavy shape of the grinding wheel surface in a cross section along a concentric circle concentric with the center of the grinding wheel, and the wavy convex portion of the wavy wheel inside Disclosed is an offset type grinding wheel in which the abrasive grain density is low and the abrasive grain density inside the grinding wheel of the corrugated concave portion is high.
【０００９】上記のオフセット形砥石車は回転円板砥石
の凹凸を有する円形切削面を工作物に接触させて能率よ
く切削するものである。一方切断砥石車は回転円板砥石
の円周面を工作物に摺動させて切削、切断を行うもので
あるが、従来の切断砥石車は全て平板状の円板砥石であ
り、その側面には全く凹凸を設けていない。The above-mentioned offset type grinding wheel is for efficiently cutting by bringing the circular cutting surface having the irregularities of the rotary disk grinding wheel into contact with the workpiece. On the other hand, a cutting wheel is one in which the circumferential surface of a rotating disk wheel is slid on the workpiece to perform cutting and cutting, but conventional cutting wheel wheels are all flat disk wheels, and the side surface Has no irregularities.
【００１０】[0010]
【発明が解決しようとする課題】従来の切断砥石車は軟
質金属である真鍮やアルミニウム等を切断する際には目
詰まりを起こし易く、またステンレス鋼等を切断する際
には切断速度が遅く、切断速度を上げるために切断の際
の荷重を掛け過ぎると、砥石車の破損や摩擦熱による摩
耗が激しく、作業者にとって非常に危険であった。従っ
て本発明は回転円板砥石の円周面を工作物に接触させて
能率よく切断を行う、切れ味が優れ、寿命が長い切断砥
石車を提供することを目的とする。The conventional cutting wheel is apt to cause clogging when cutting soft metals such as brass and aluminum, and has a slow cutting speed when cutting stainless steel and the like. If too much load is applied during cutting in order to increase the cutting speed, the grinding wheel will be damaged and wear due to frictional heat will be severe, which is very dangerous for the operator. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cutting wheel having excellent sharpness and long life, which makes the circumferential surface of a rotating disk grindstone contact a workpiece to perform cutting efficiently.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成すべく、
本発明者は鋭意研究を重ねた結果、回転円板砥石よりな
る切断砥石車の円形の側面に凹凸を設けると共に、切断
砥石車内部の砥粒密度に粗密差を設けることにより、極
めて切れ味が優れ切削能率がよく、目詰まりが起きず、
長寿命の切断砥石車を得ることができることを見出し本
発明を完成するに到った。In order to achieve the above object,
The present inventor, as a result of repeated studies, provided unevenness on the circular side surface of the cutting wheel made of a rotating disk grindstone, and by providing a difference in the density of the abrasive grains inside the cutting wheel, the sharpness was extremely excellent. Good cutting efficiency, no clogging,
The inventors have found that a cutting wheel having a long life can be obtained, and completed the present invention.
【００１２】即ち、本発明は砥粒を結合剤等と配合して
なる砥粒配合物を円板状に圧縮成型し、焼成してなる切
断砥石車において、該切断砥石車の片面又は両面に凹凸
を設けると共に、該凹凸の凸部の内部の砥粒密度が小さ
く、凹部の内部の砥粒密度が大きいことを特徴とする切
断砥石車を要旨とする。That is, the present invention relates to a cutting wheel which is obtained by compression-molding an abrasive particle mixture prepared by mixing abrasive particles with a binder or the like into a disc shape, and firing the same, on one or both sides of the cutting wheel. The gist of a cutting wheel is characterized in that the unevenness is provided, the abrasive grain density inside the convex portion of the unevenness is small, and the abrasive grain density inside the concave portion is large.
【００１３】他の本発明は底に円板状の下型を嵌合して
軸線が鉛直になるように設置した円筒内で上型と下型の
間に結合剤を混合した砥粒粉末よりなる砥粒配合物を挟
んで高圧でプレスして円板状に成形した後、その円板状
成型品を加熱焼成する砥石車の製造法において、該円筒
内で上面に凹凸を有する下型上面に一定の厚さに砥粒配
合物を堆積して砥粒層となし、該砥粒層の上に下面に凹
凸を有する上型を置いてプレス成形し、両面に凹凸を有
する円板状に成型することにより、切断砥石車の内部に
砥粒密度の高い部分から砥粒密度の低い部分まで砥粒密
度の分布を形成することを特徴とする砥石車の製造法を
要旨とする。According to another aspect of the present invention, a disc-shaped lower die is fitted on the bottom, and an abrasive powder is prepared by mixing a binder between the upper die and the lower die in a cylinder installed so that the axis is vertical. In the method of manufacturing a grinding wheel in which a disc-shaped molded product is heated and fired after being pressed with high pressure by sandwiching the abrasive grain mixture, the lower mold upper surface having irregularities on the upper surface in the cylinder. An abrasive grain composition is deposited to a certain thickness to form an abrasive grain layer, and an upper mold having irregularities on the lower surface is placed on the abrasive grain layer and press-molded to form a disc shape having irregularities on both sides. A method of manufacturing a grinding wheel is characterized in that a distribution of the abrasive grain density is formed from a portion having a high abrasive grain density to a portion having a low abrasive grain density inside the cutting wheel by molding.
【００１４】次に本発明の内容を図面により詳細に説明
する。図３は本発明の砥石車の一例の切断砥石車平面
図、図４は同ＡＯＡ断面図、図５は同円弧Ｂ−Ｂに沿う
断面図である。５は切断砥石車であり、その側面９に放
射状に延びる細長い扇形の凸部７及び凹部８を交互に設
ける。凸部７と凹部８は切断砥石車５の両面に面対称形
に設けるのが好ましいが、必ずしも対称形である必要は
なく、切断砥石車５の片面にのみ凹凸を設けてもよい
し、切断砥石車５の両面の凹凸形状を異なる形状、異な
る配置としてもよい。Next, the contents of the present invention will be described in detail with reference to the drawings. 3 is a plan view of a cutting grinding wheel of an example of the grinding wheel of the present invention, FIG. 4 is a sectional view of the same AOA, and FIG. 5 is a sectional view taken along the same arc BB. Reference numeral 5 denotes a cutting wheel, which has elongated fan-shaped projections 7 and recesses 8 extending in a radial pattern alternately on its side surface 9. It is preferable that the convex portion 7 and the concave portion 8 are provided on both sides of the cutting wheel 5 in a plane-symmetrical manner, but it is not always necessary to have a symmetrical shape, and unevenness may be provided on only one side of the cutting wheel 5 and cutting is possible. The concavo-convex shapes on both sides of the grinding wheel 5 may be different shapes or different arrangements.
【００１５】後述する方法により本発明の切断砥石車５
を製造すると、凸部７の内部の砥粒密度が小さく、凹部
８の内部砥粒密度が大きくなり、砥粒密度の大きい部分
と小さい部分が回転切削中に交互に工作物を切削するこ
とになる。The cutting wheel 5 of the present invention is manufactured by the method described below.
, The internal abrasive grain density of the convex portion 7 is low and the internal abrasive grain density of the concave portion 8 is high, so that the high abrasive grain density portion and the low abrasive grain density portion alternately cut the workpiece during rotary cutting. Become.
【００１６】切断砥石車５の側面９の凹部８と凸部７の
形状は及び配置は勿論図３に示すものに限定されるもの
ではなく、種々の形状配置が可能であるが、その形状及
び配置に必要な条件は、切断砥石車５の回転軸心を中心
とする同心円のうち、切削に用いられる範囲内のあらゆ
る同心円上において、凸部７と凹部８が適当な割合で交
互に配置される必要がある。ある特定の同心円上におい
て、凸部７のみ或いは凹部８のみがその同心円全周にわ
たって配置されるのは好ましくない。何となれば、その
同心円まで切断砥石車５が摩耗したときには、凸部７又
は凹部８のみによって切削され、一定幅で一定砥粒密度
の切断砥石車５の周縁により切断が行われることにな
り、通常の従来の切断砥石車５による切断と変りない状
態となるからである。The shapes and arrangements of the concave portions 8 and the convex portions 7 on the side surface 9 of the cutting wheel 5 are not limited to those shown in FIG. 3 and, of course, various shapes can be arranged. The condition necessary for the arrangement is that the convex portions 7 and the concave portions 8 are alternately arranged at an appropriate ratio on all concentric circles within the range used for cutting among the concentric circles centering on the rotation axis of the cutting wheel 5 Need to On a particular concentric circle, it is not preferable that only the convex portion 7 or only the concave portion 8 is arranged over the entire circumference of the concentric circle. What happens is that when the cutting wheel 5 is worn to the concentric circles, it is cut only by the convex portion 7 or the concave portion 8 and is cut by the peripheral edge of the cutting wheel 5 having a constant width and a constant abrasive grain density. This is because the state is the same as the cutting by the normal conventional cutting wheel 5.
【００１７】凹部８、凸部７の形状及び配置の他の例を
例えば図６、図７に示す。図６では側面９の凹部８の中
に多数の凸部７が島状に存在する。図６において、凹部
８が凸部７に、凸部７が凹部８になり、凸部７と凹部８
が図６と逆の配置であってもよい。図７は同心円と放射
状に延びる線で区画された各部に放射碁盤目状に凸部７
と凹部８を配置したものである（図７には凹部８及び凸
部７の一部のみを表示する。）。Other examples of the shapes and arrangements of the concave portions 8 and the convex portions 7 are shown in FIGS. 6 and 7, for example. In FIG. 6, a large number of protrusions 7 are present in an island shape in the recesses 8 on the side surface 9. In FIG. 6, the concave portion 8 becomes the convex portion 7, the convex portion 7 becomes the concave portion 8, and the convex portion 7 and the concave portion 8
May be the reverse of the arrangement shown in FIG. FIG. 7 shows the convex portions 7 in a radial grid pattern on each portion divided by concentric circles and radially extending lines.
And the concave portion 8 is arranged (only a part of the concave portion 8 and the convex portion 7 is shown in FIG. 7).
【００１８】切断砥石車５の側面９の凹凸の断面形状の
波１０は図５に示す矩形波状に限定されるものではな
く、図８に示す鋸歯状波、図９に示す三角波状、図１０
に示す台形波状、図１１に示す略正弦波状等の何れの形
状も可能である。Waves 10 having an uneven cross-section on the side surface 9 of the cutting wheel 5 are not limited to the rectangular wave shape shown in FIG. 5, but the sawtooth wave shown in FIG. 8, the triangular wave shape shown in FIG.
Any shape such as the trapezoidal wave shape shown in FIG. 11 and the substantially sinusoidal wave shape shown in FIG. 11 is possible.
【００１９】図３に示すような放射状に凹部８と凸部７
を設ける場合には、上記同心円の断面における波１０の
数は特に制限はないが、砥石車の直径やその使用目的に
応じて、１０〜１００の波数が用いられる。例えば直径
１００mmの切断砥石車５に対しては、１５〜５０の波数
が好ましく用いられる。凸部７と凹部８の部分の切断砥
石車５の厚みは特に制限はないが、例えば砥石車の両面
に対称に凹凸を設ける場合に、凸部７の部分の砥石車の
厚み（砥石車の最大厚み）Ｄを１．５〜４．０mm、凹部
８の砥石車の厚みｄを０．７〜３．０mm、その比ｄ／Ｄ
を０．３〜０．７とすることができる。波１０の波高ｈ
は切断砥石車５の凸部７の厚みＤの５〜３５％が好まし
く、７〜３０％がより好ましく、１０〜２５％が更に好
ましい。この波高ｈがＤの５％より小さいと、凹部８の
内部の砥粒密度と凹部８以外の部分の砥粒密度の差が小
さくなり、目詰まり防止、切削速度向上の効果が小さく
なる。波高ｈがＤの３５％より大きいと、砥石車のプレ
ス成型の際、凹部７底部が一定の砥粒密度まで圧縮され
るとそれ以上圧縮できないから、砥石車の凸部９の圧縮
率が小さくなり、その部分の砥石車の強度が低下し、砥
石車全体の強度が低下する。又凹部８と凸部７の面積比
は特に制限はないが、例えば０．２〜０．８が選ばれ、
０．４〜０．６が好ましく用いられる。Radial recesses 8 and projections 7 as shown in FIG.
When providing, the number of waves 10 in the cross section of the concentric circle is not particularly limited, but a wave number of 10 to 100 is used depending on the diameter of the grinding wheel and the purpose of use thereof. For example, for a cutting wheel 5 having a diameter of 100 mm, a wave number of 15 to 50 is preferably used. The thickness of the cutting grinding wheel 5 at the convex portion 7 and the concave portion 8 is not particularly limited, but for example, when unevenness is provided symmetrically on both sides of the grinding wheel, the thickness of the grinding wheel at the convex portion 7 (the grinding wheel The maximum thickness) D is 1.5 to 4.0 mm, the thickness d of the grinding wheel in the recess 8 is 0.7 to 3.0 mm, and the ratio d / D
Can be 0.3 to 0.7. Wave height h of wave 10
Is preferably 5 to 35%, more preferably 7 to 30%, and even more preferably 10 to 25% of the thickness D of the convex portion 7 of the cutting wheel 5. If the wave height h is less than 5% of D, the difference between the abrasive grain density inside the concave portion 8 and the abrasive grain density outside the concave portion 8 becomes small, and the effect of preventing clogging and improving the cutting speed becomes small. When the wave height h is larger than 35% of D, the compression ratio of the convex portion 9 of the grinding wheel is small because the bottom of the concave portion 7 cannot be further compressed when the bottom of the concave portion is compressed to a certain abrasive grain density during press molding of the grinding wheel. As a result, the strength of the grinding wheel at that portion decreases, and the strength of the entire grinding wheel decreases. The area ratio of the concave portion 8 and the convex portion 7 is not particularly limited, but is selected, for example, from 0.2 to 0.8,
0.4 to 0.6 is preferably used.
【００２０】波高ｈは全ての波で一定である必要はな
く、波により波高ｈを変化させることができる。特に同
心円の円弧に沿う図１２の断面図示すように、波高ｈの
大、中、小の波をその順序に繰り返し循環的に配列する
事もできる。The wave height h does not have to be constant for all waves, and the wave height h can be changed depending on the wave. In particular, as shown in the cross-sectional view of FIG. 12 along the arc of concentric circles, large, medium, and small waves of wave height h can be repeatedly and cyclically arranged in that order.
【００２１】本発明の砥石車を製造するには、例えば図
３〜５に示す切断砥石車５の場合には、図１３に示すよ
うに円筒１と下型２及び上型４よりなる金型１１を用い
る。上型４及び下型２の中央にはそれぞれピン１２を挿
通する中心孔１３を有し、上型４の下面及び下型２の上
面に、放射状に矩形波状の波１０を形成するための波型
１４を有する。In order to manufacture the grinding wheel of the present invention, for example, in the case of the cutting wheel 5 shown in FIGS. 3 to 5, as shown in FIG. 13, a mold comprising a cylinder 1, a lower mold 2 and an upper mold 4. 11 is used. The upper mold 4 and the lower mold 2 each have a central hole 13 through which a pin 12 is inserted, and a wave for forming a rectangular wave 10 radially on the lower surface of the upper mold 4 and the upper surface of the lower mold 2. It has a mold 14.
【００２２】この金型１１の円筒１の底部に下型２を嵌
め、その上に薄く後述の砥粒配合物１５を入れ、全体を
一定の深さにならす。その上にガラス繊維等よりなる補
強布１６を載置し、更に砥粒配合物１５を一定の深さに
入れてその上を上型４で押さえ、油圧プレス装置で加圧
する。必要に応じてガラス繊維等よりなる補強布１６を
砥粒層の中間にもう一枚挟んでプレスしてもよい。補強
布１６は砥粒層１８の上下両面に配してもよい。The lower mold 2 is fitted on the bottom of the cylinder 1 of the mold 11, and a thin abrasive compound 15 to be described later is put on the lower mold 2, and the whole is leveled to a constant depth. A reinforcing cloth 16 made of glass fiber or the like is placed thereon, and further, the abrasive grain mixture 15 is placed at a constant depth, and the upper mold 4 is pressed onto the abrasive cloth 15 and pressed by a hydraulic press device. If necessary, another reinforcing cloth 16 made of glass fiber or the like may be sandwiched between the abrasive grain layers and pressed. The reinforcing cloth 16 may be provided on both upper and lower surfaces of the abrasive grain layer 18.
【００２３】本発明の砥石車の製造に用いられる砥粒は
炭化珪素、アルミナ、ジルコニヤ、金剛砂等公知の砥石
車用砥粒を用いることができる。又部分的にダイヤモン
ド砥粒を混合して用いることもできる。砥粒に結合剤と
してレゾール型或いはベンジリックエーテル型等の液状
フェノール樹脂及び粉状フェノール樹脂を配合して砥粒
配合物２３とする。その配合割合は砥粒１００重量部に
対し結合剤の量は１０〜３０重量部が適当であり、１５
〜２５重量部が更に好ましい。液状フェノール樹脂と粉
状フェノール樹脂の割合、及び配合量を調節して、砥粒
配合物の流動性を適宜調節することができる。本発明の
方法により砥石車を製造するためには、砥粒配合物の流
動性を適当な流動性に調節することが必要である。砥粒
配合物１５が余り流動性が大きく、さらさらと流動する
状態では、下面に波型１４を有する上型４で砥粒層を押
さえたとき、波型１４の凸部の下に当たる部分の砥粒３
が水平方向に容易に移動してしまい、その部分の砥粒密
度を充分大きく成型することができない。又流動性が悪
いと、プレス圧力が砥石車の内部まで均等に伝達され
ず、表面に垂直な方向に均等なプレスが困難となる（砥
石車の表面に平行な方向には、砥粒密度の高い部分と低
い部分を生ぜしめるのであるから、当然均等ではな
い。）。砥粒配合物１５を手で強く握ったとき、少し形
ができる程度の保形性を有するのが望ましい。As the abrasive grains used for manufacturing the grinding wheel of the present invention, known abrasive grains for grinding wheels such as silicon carbide, alumina, zirconia, and hard sand can be used. It is also possible to partially mix and use diamond abrasive grains. A liquid phenol resin such as a resol type resin or a benzylic ether type resin and a powdery phenol resin are mixed with the abrasive grains as a binder to form an abrasive grain mixture 23. The amount of the binder is appropriately 10 to 30 parts by weight with respect to 100 parts by weight of the abrasive grains.
-25 parts by weight is more preferable. The fluidity of the abrasive compound can be appropriately adjusted by adjusting the ratio of the liquid phenol resin and the powdery phenol resin and the compounding amount thereof. In order to manufacture a grinding wheel by the method of the present invention, it is necessary to adjust the fluidity of the abrasive composition to an appropriate fluidity. In a state where the abrasive grain mixture 15 has too great fluidity and flows smoothly, when the abrasive grain layer is pressed by the upper die 4 having the corrugation 14 on the lower surface, the portion of the corrugated 14 that hits below the convex portion Grain 3
Moves easily in the horizontal direction, and the abrasive grain density at that portion cannot be molded sufficiently high. If the fluidity is poor, the pressing pressure is not evenly transmitted to the inside of the grinding wheel, making it difficult to press uniformly in the direction perpendicular to the surface (in the direction parallel to the surface of the grinding wheel, the abrasive grain density Of course, they are not equal, because they give rise to high and low parts.). It is desirable that the abrasive grain composition 15 has a shape-retaining property such that it can be slightly shaped when it is strongly gripped by hand.
【００２４】砥粒配合物１５には更に有機溶媒その他の
液状の流動性調整剤を添加することができる。又、氷晶
石、炭酸カルシウム、ホワイトカーボン等の粉状充填
剤、着色料等通常の砥石車の製造の際砥粒に配合する添
加物を適宜配合することができる。The abrasive composition 15 may further contain an organic solvent or other liquid fluidity modifier. Further, additives such as powder fillers such as cryolite, calcium carbonate and white carbon, coloring agents and the like to be added to the abrasive grains during the production of a usual grinding wheel can be appropriately blended.
【００２５】金型１１により砥粒配合物１５をプレスす
る圧力は特に制限はないが、通常１００〜１５０kgf/cm
2が用いられる。プレス温度は８０〜１００℃の通常の
プレス温度が用いられる。Press the abrasive compound 15 with the mold 11.
The pressure to be applied is not particularly limited, but is usually 100 to 150 kgf / cm
2 is used. The press temperature is usually 80-100 ° C.
The press temperature is used.
【００２６】このようにして円板状に成型された砥粒成
型体は１７０〜１８０℃で約２４時間かけて焼成され
る。最初の１４時間で常温から１７０℃付近まで徐々に
昇温し、その後１７０〜１８０℃で約１０時間保った
後、徐冷する。The abrasive grain molded body thus molded into a disc shape is fired at 170 to 180 ° C. for about 24 hours. In the first 14 hours, the temperature is gradually raised from room temperature to around 170 ° C., and after that, the temperature is maintained at 170 to 180 ° C. for about 10 hours and then gradually cooled.
【００２７】本発明の砥石車のプレス成型物を焼成する
際に多数枚を積層して同時に成型する際には、焼成中に
砥石車が歪曲しないように、プレス成型物と厚み１〜２
mmの薄い鉄板を交互に重ねて積層し、５０〜１００枚プ
レス成型物を積層して、全体に荷重を加えつつ加熱焼成
すれば焼成中に、砥石車が歪曲することなく焼成するこ
とができる。When a plurality of press-molded products of the grinding wheel of the present invention are fired and laminated at the same time, the press-formed product and the thicknesses of 1 to 2 are formed so that the grinding wheel is not distorted during firing.
If thin iron plates of mm are alternately stacked and laminated, and 50 to 100 press-molded products are laminated and heated and baked while applying a load to the whole, the grinding wheel can be baked without being distorted during the baking. .
【００２８】次に本発明の方法により砥石車を製造する
方法の一例について更に詳細に説明する。６０メッシュ
の緑色炭化珪素粉末１００重量部、液状フェノール樹脂
１８重量部、氷晶石粉末充填剤６５０重量部、着色料少
量を混合し、砥粒配合物Ａとする。一方６０メッシュの
緑色炭化珪素粉末１００重量部、液状フェノール樹脂５
重量部、粉状フェノール樹脂１５重量部、氷晶石粉末５
重量部、着色料少量を混合し、砥粒配合物Ｂとする。砥
粒配合物ＡとＢを適宜混合して用いる。砥粒配合物Ａと
Ｂを３：７〜２：８の混合比で混合して、予め約７０℃
に加熱した図６に示す金型１１内の下型２の上に下部砥
粒層１８ａとして、約２mmの厚さに均一にならして敷
き、その上にフェノール樹脂液を含浸したガラス繊維補
強布１６を敷く。更にその上に下部砥粒層１８ａと同一
の配合の砥粒配合物を上部砥粒層１８ｂとして均一な厚
みに均して２mmの厚みに充填する。最後に金属製補強リ
ング１９を砥粒層１８の中央部の一番上に置く。この砥
粒層１８の上に、放射状に凹凸が延びる矩形波状波型１
４を下面に有する上型４を被せ、１００ｔ油圧プレスで
８０kgf/cm2 まで加圧して図３〜５に示す形状に成型
し、直径１０５mmの円板状のプレス成型物を得た。プレ
ス温度は９０℃である。このプレス成型物５０枚をそれ
ぞれ０．７mm圧の鉄板と交互に積層して焼成炉に入れ、
１４時間かかって所定温度まで昇温し、その後１０時間
その温度に保ったのち、そのまま放冷する。Next, an example of a method for manufacturing a grinding wheel by the method of the present invention will be described in more detail. 100 parts by weight of 60-mesh green silicon carbide powder, 18 parts by weight of liquid phenol resin, 650 parts by weight of cryolite powder filler, and a small amount of a coloring agent are mixed to form an abrasive grain mixture A. On the other hand, 100 parts by weight of 60-mesh green silicon carbide powder, liquid phenol resin 5
Parts by weight, 15 parts by weight of powdered phenolic resin, cryolite powder 5
By mixing a part by weight and a small amount of a coloring agent, an abrasive grain mixture B is obtained. The abrasive grain formulations A and B are used by appropriately mixing them. Abrasive blends A and B were mixed in a mixing ratio of 3: 7 to 2: 8 and preheated to about 70 ° C.
As a lower abrasive grain layer 18a, it is evenly spread to a thickness of about 2 mm on the lower mold 2 in the mold 11 shown in FIG. Lay the cloth 16. Furthermore, an abrasive grain composition having the same composition as that of the lower abrasive grain layer 18a is further formed thereon as an upper abrasive grain layer 18b so as to have a uniform thickness and be filled to a thickness of 2 mm. Finally, the metal reinforcing ring 19 is placed on top of the central portion of the abrasive grain layer 18. Rectangular wave-shaped wave pattern 1 in which unevenness is radially extended on the abrasive grain layer 18
4 was placed on the lower surface, and the upper die 4 having a lower surface was pressed to 80 kgf / cm 2 with a 100-ton hydraulic press to form the shape shown in FIGS. 3 to 5 to obtain a disk-shaped press-formed product having a diameter of 105 mm. The press temperature is 90 ° C. 50 press-molded products were alternately laminated with 0.7 mm pressure iron plates and placed in a firing furnace.
It takes 14 hours to raise the temperature to a predetermined temperature, and then the temperature is maintained for 10 hours, and then, it is left to cool.
【００２９】この切断砥石車５を用いて鉄板、真鍮板、
アルミニウム板の表面を切断したところ、砥石車の目詰
まりが全くなく、従来の通常の切断砥石車に比較して数
倍の速度で切断可能であり、また砥石車の寿命が長く、
使用中、砥石車のひび割れ、欠損等は全くなく、極めて
安全に作業することができる。Using this cutting wheel 5 an iron plate, a brass plate,
When cutting the surface of the aluminum plate, there is no clogging of the grinding wheel at all, it is possible to cut at a speed several times faster than the conventional normal cutting grinding wheel, and the life of the grinding wheel is long,
During use, there is no cracking or chipping of the grinding wheel, and it is possible to work extremely safely.
【００３０】〔実施例１〕上記の方法で直径１０５mm、
上面に放射状に矩形波状の波型１４を有する下型２の上
に上部及び下部砥粒層の砥粒配合物ＡとＢの配合比を
３：７とし、放射状に矩形波状の波型１４を有する上型
４でプレスして（図８）、焼成し、凸部７の数１８本、
波高ｈ０．６mm、凸部７の厚み２．４mm、凹部８の厚み
１．２mm、の切断砥石車５を作製した。その切断砥石車
５により、３０００及び４３００rpm、３kgf の荷重
で、直径１６mmの鋼棒（ＳＳ１１）よりなる加工物を切
断して試験した。その試験結果を表１に示す。切断速度
は波型のない上型４及び下型２を用いて全く同様に製作
した従来の切断砥石車を比較例として、比較例の切削速
度を１として、比較値で示す。Example 1 A diameter of 105 mm was obtained by the above method.
On the lower die 2 having the rectangular wave shape 14 having a radial shape on the upper surface, the mixing ratio of the abrasive composition A and B of the upper and lower abrasive particle layers is 3: 7, and the rectangular wave shape 14 having a radial shape is formed. Pressed with the upper mold 4 (FIG. 8) and fired, the number of convex portions 7 is 18,
A cutting wheel 5 having a wave height h of 0.6 mm, a convex portion 7 having a thickness of 2.4 mm and a concave portion 8 having a thickness of 1.2 mm was produced. The cutting wheel 5 was used to cut and test a workpiece made of a steel rod (SS11) having a diameter of 16 mm at a load of 3000 and 4300 rpm and 3 kgf. The test results are shown in Table 1. The cutting speed is shown as a comparative value, where the conventional cutting grinding wheel manufactured in exactly the same manner using the upper mold 4 and the lower mold 2 having no corrugation is used as a comparative example and the cutting speed of the comparative example is 1.
【表１】 [Table 1]
【００３１】〔実施例２〕実施例１と同様にして、図８
に示すように鋸歯状波を放射状に設けた切断砥石車５を
製作した。鋸歯状波の波高ｈは０．５mm、その他の条件
は実施例１と全く同様にして製作した切断砥石車５につ
いて、同様な切断試験を行い、その結果を表１に示す。[Second Embodiment] Similar to the first embodiment, FIG.
A cutting wheel 5 having sawtooth waves radially provided as shown in FIG. The wave height h of the sawtooth wave was 0.5 mm, and other conditions were the same as in Example 1, and the cutting wheel 5 produced in this way was subjected to the same cutting test. The results are shown in Table 1.
【００３２】[0032]
【作用】本発明の砥石車の製造方法によれば、図１３に
模式的に示すように、金型１１の上面に凹凸を有する下
型２の上に、鎖線で示された一定の高さＨの位置まで均
一に堆積された砥粒層１８を、下面に凹凸を有する上型
４で押さえ、そのまま高圧で圧縮すると、下型２及び上
型４の波型１４によりＨ1 の厚みまで圧縮された凹部８
は、Ｈ1 からＨ2 の高さへの圧縮率が大きく、高密度部
２０となり、下型２および上型４の凹部で圧縮された凸
部７はＨ3 からＨ4 の厚みまでしか圧縮されないので、
砥粒層１８の圧縮率が小さく、その部分は低密度部２１
となる。According to the method for manufacturing a grinding wheel of the present invention, as shown schematically in FIG. 13, a fixed height indicated by a chain line is formed on the lower die 2 having the unevenness on the upper surface of the die 11. When the abrasive grain layer 18 uniformly deposited up to the H position is pressed by the upper mold 4 having irregularities on the lower surface and compressed at high pressure as it is, it is compressed to the thickness of H 1 by the corrugations 14 of the lower mold 2 and the upper mold 4. Recess 8
Has a high compression rate from the height of H 1 to H 2 and becomes the high density portion 20, and the convex portion 7 compressed by the concave portions of the lower mold 2 and the upper mold 4 is compressed only to the thickness of H 3 to H 4. Is not done,
The compressibility of the abrasive grain layer 18 is small, and that portion is the low density portion 21.
Becomes
【００３３】本発明の砥石車によれば、砥石車の表面に
凹凸があり、その凹部８の内部の砥粒密度が高く、この
砥石車を回転して金属等を切断すると、切断される金属
表面は砥石車の高密度部分から低密度部分へと、更に空
間部分というように、順次繰り返して接触する結果、表
面状態が時々刻々変化し、従来の通常の同じ密度の砥石
に連続して摺動する場合よりも、驚異的に切削速度が向
上する。これは砥石車の密度の低い部分の砥粒が脱落し
て、これがその隣の砥粒密度の高い部分と切削中の金属
表面の間に入り、金属切削すると同時に、砥石車の砥粒
密度の高い部分の表面を削り、表面を更新して、砥粒の
隙間に詰まり易い金属微粒を排除するためであると推定
される。更に砥石車表面の凹部は切削された金属粉等の
排除効果があり、この点からも砥石の目詰まり防止に効
果的に作用する。According to the grinding wheel of the present invention, there are irregularities on the surface of the grinding wheel, and the density of the abrasive grains inside the concave portion 8 is high. When the grinding wheel is rotated to cut metal or the like, the metal is cut. The surface is contacted repeatedly from the high density part of the grinding wheel to the low density part, and then to the space part.As a result, the surface condition changes from moment to moment, and it continuously slides on the conventional grindstone of the same density. The cutting speed is surprisingly improved compared to the case of moving. This is because the abrasive grains in the low density part of the grinding wheel fall off, and this enters between the high density part next to it and the metal surface being cut, and at the same time as metal cutting, the abrasive particle density of the grinding wheel It is presumed that this is because the surface of the high portion is shaved and the surface is renewed so as to eliminate the metal fine particles that are easily clogged in the gaps between the abrasive grains. Further, the concave portion on the surface of the grinding wheel has an effect of removing the cut metal powder and the like, and also from this point, it effectively acts to prevent the clogging of the grinding wheel.
【００３４】本発明の砥石車の表面の波型は、砥石車の
回転中、砥石車と切削中の金属の摺動を中断させること
により、砥石車及び切削金属を冷却し、砥石車の寿命を
大幅に延ばすことができる。The corrugation on the surface of the grinding wheel of the present invention cools the grinding wheel and the cutting metal by interrupting the sliding between the grinding wheel and the metal during cutting during the rotation of the grinding wheel, and the life of the grinding wheel. Can be significantly extended.
【００３５】本発明の切断砥石車５はダイヤモンド砥粒
を用いるダイヤモンド切断砥石車にも適用できる。その
際には高価なダイヤモンド砥粒は、通常の砥粒と混合し
て砥石車の周縁部のみに配することができる。The cutting wheel 5 of the present invention can also be applied to a diamond cutting wheel using diamond abrasive grains. In that case, expensive diamond abrasive grains can be mixed with normal abrasive grains and placed only on the peripheral portion of the grinding wheel.
【００３６】[0036]
【発明の効果】本発明の砥石車によれば、従来の通常の
切断砥石車に比較して、切断速度が大幅に向上し、軟質
金属を切断する場合でも砥石の目詰まりが全く生じな
い。砥石車の寿命が大幅に延び、砥石車の回転数を落と
しても高い切断速度が得られ、切断中の砥石車の破損の
虞もない。超硬特殊鋼は従来の切断砥石車では殆ど切断
不能であったが、本発明の切断砥石車では容易に切断可
能である。According to the grinding wheel of the present invention, the cutting speed is remarkably improved as compared with the conventional normal cutting grinding wheel, and no clogging of the grinding wheel occurs even when cutting a soft metal. The life of the grinding wheel is greatly extended, a high cutting speed can be obtained even if the number of rotations of the grinding wheel is reduced, and there is no risk of damage to the grinding wheel during cutting. Carbide special steel could hardly be cut by the conventional cutting wheel, but it can be easily cut by the cutting wheel of the present invention.
【００３７】本発明の砥石車の製造方法によれば、密度
の異なる部分を有する砥石車を極めて簡単な方法で製造
することができ、製造コストの削減、製品品質の均一化
を図ることができる。According to the method for manufacturing a grinding wheel of the present invention, a grinding wheel having portions having different densities can be manufactured by an extremely simple method, and the manufacturing cost can be reduced and the product quality can be made uniform. .
【図１】従来の砥石車の成型用金型の縦断面図である。FIG. 1 is a vertical cross-sectional view of a molding die for a conventional grinding wheel.
【図２】従来の砥石車の成型用押し型の斜視図である。FIG. 2 is a perspective view of a conventional pressing die for a grinding wheel.
【図３】本発明の砥石車の一例の平面図である。FIG. 3 is a plan view of an example of the grinding wheel of the present invention.
【図４】本発明の砥石車の一例のＡ−Ａ断面図である。FIG. 4 is a sectional view taken along line AA of an example of the grinding wheel of the present invention.
【図５】本発明の砥石車の一例の円弧Ｂ−Ｂに沿う断面
図である。FIG. 5 is a cross-sectional view taken along an arc BB of an example of the grinding wheel of the present invention.
【図６】本発明の砥石車の一例の平面図である。FIG. 6 is a plan view of an example of the grinding wheel of the present invention.
【図７】本発明の砥石車の一例の平面図である。FIG. 7 is a plan view of an example of the grinding wheel of the present invention.
【図８】本発明の砥石車の一例の円弧に沿う断面図であ
る。FIG. 8 is a cross-sectional view taken along an arc of an example of the grinding wheel of the present invention.
【図９】本発明の砥石車の一例の円弧に沿う断面図であ
る。FIG. 9 is a sectional view taken along an arc of an example of the grinding wheel of the present invention.
【図１０】本発明の砥石車の一例の円弧に沿う断面図で
ある。FIG. 10 is a sectional view taken along an arc of an example of the grinding wheel of the present invention.
【図１１】本発明の砥石車の一例の円弧に沿う断面図で
ある。FIG. 11 is a cross-sectional view along an arc of an example of the grinding wheel of the present invention.
【図１１】本発明の砥石車の一例の円弧に沿う断面図で
ある。FIG. 11 is a cross-sectional view along an arc of an example of the grinding wheel of the present invention.
【図１３】本発明の砥石車の製造法を説明する断面図で
ある。FIG. 13 is a cross-sectional view illustrating the method for manufacturing the grinding wheel of the present invention.
１ 円筒 ２ 下型 ３ 砥粒 ４ 上型 ５ 切断砥石車 ７ 凸部 ８ 凹部 ９ 側面 １０ 波 １１ 金型 １２ ピン １３ 中心孔 １４ 波型 １５ 砥粒配合物 １６ 補強布 １７ 押し型 １８ 砥粒層 １９ 補強リング ２０ 高密度部 ２１ 低密度部 1 Cylinder 2 Lower Die 3 Abrasive Grain 4 Upper Die 5 Cutting Grinding Wheel 7 Convex 8 Recess 9 Side 10 Wave 11 Die 12 Pin 13 Center Hole 14 Wave Dye 15 Abrasive Grain Mixture 16 Reinforcing Cloth 17 Push 18 Abrasive Layer 19 Reinforcement ring 20 High density part 21 Low density part
Claims (7)
を円板状に圧縮成型し、焼成してなる切断砥石車におい
て、該切断砥石車の片面又は両面に凹凸を有すると共
に、該凹凸の凸部の内部の砥粒密度が小さく、凹部の内
部の砥粒密度が大きいことを特徴とする切断砥石車。1. A cutting wheel, which comprises compression-molding a disk-shaped abrasive particle mixture prepared by mixing abrasive particles with a binder, etc., and firing, wherein the cutting wheel has irregularities on one or both sides. At the same time, the grinding wheel is characterized in that the abrasive grain density inside the convex portions of the irregularities is low and the abrasive grain density inside the concave portions is high.
する同心円のうち該切断砥石車の切断に使用される範囲
内にある各同心円に沿った円弧状断面において、砥粒密
度の大なる該凹部と砥粒密度の小なる該凸部が交互に配
設された請求項１記載の切断砥石車。2. Abrasive grain density in an arcuate cross section along each concentric circle within the range used for cutting of said cutting wheel among the concentric circles whose center is the rotation axis of said cutting wheel, 2. The cutting wheel according to claim 1, wherein the concave portions having a large diameter and the convex portions having a small abrasive grain density are alternately arranged.
に向って略放射状方向に延びる凹部と凸部よりなり、且
つ該切断砥石車の中心と同心の同心円に沿った断面にお
ける該切断砥石車の表面の形状が矩形波状、鋸歯状波
状、三角波状、台形波状、略正弦波状等の波状をなす波
型である請求項１記載の切断砥石車。3. The concavo-convex portion is composed of a concave portion and a convex portion that extend in a substantially radial direction from a central portion of the cutting grinding wheel toward an outer peripheral portion, and in a cross section along a concentric circle concentric with the center of the cutting grinding wheel. The cutting wheel according to claim 1, wherein the surface of the cutting wheel has a corrugated shape such as a rectangular wave shape, a sawtooth wave shape, a triangular wave shape, a trapezoidal wave shape, or a substantially sine wave shape.
た断面における該切断砥石車の表面の形状が矩形波状で
ある請求項３記載の切断砥石車。4. The cutting wheel according to claim 3, wherein the shape of the surface of said cutting wheel in a section along a concentric circle concentric with the center of said cutting wheel is a rectangular wave.
５〜３５％である請求項１乃至４記載の砥石車。5. The grinding wheel according to claim 1, wherein the wave height of the corrugation is 5 to 35% of the maximum thickness of the cutting grinding wheel.
なるように設置した円筒内で上型と下型の間に結合剤を
混合した砥粒粉末よりなる砥粒配合物を挟んで高圧でプ
レスして円板状に成形した後、その円板状成型品を加熱
焼成する砥石車の製造法において、該円筒内で上面に凹
凸を有する下型上面に一定の厚さに砥粒配合物を堆積し
て砥粒層となし、該砥粒層の上に下面に凹凸を有する上
型を置いてプレス成形し、両面に凹凸を有する円板状に
成型することにより、切断砥石車の内部に砥粒密度の高
い部分から砥粒密度の低い部分まで砥粒密度の分布を形
成することを特徴とする砥石車の製造法。6. Abrasive grains consisting of abrasive grain powder in which a binder is mixed between the upper mold and the lower mold in a cylinder in which a disc-shaped lower mold is fitted on the bottom so that the axis is vertical. In a method of manufacturing a grinding wheel in which a compound is sandwiched and pressed into a disk shape by high pressure, and then the disk-shaped molded article is heated and baked, a lower mold having a concavo-convex upper surface inside the cylinder has a constant shape. To form an abrasive grain layer by depositing an abrasive grain composition to a thickness, place an upper mold having irregularities on the lower surface on the abrasive grain layer, and press-mold it to form a disc shape having irregularities on both sides. According to the method, a grinding wheel manufacturing method is characterized in that an abrasive grain density distribution is formed in a cutting wheel from a portion having a high abrasive grain density to a portion having a low abrasive grain density.
以上のガラス繊維補強布を介在させて砥粒層を堆積さ
せ、プレス成形する請求項６記載の砥石車の製造法。7. The method of manufacturing a grinding wheel according to claim 6, wherein one or more glass fiber reinforcing cloths are interposed on both sides or in the middle of said abrasive grain layer to deposit the abrasive grain layer and press-molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7119390A JP3028320B2 (en) | 1995-04-19 | 1995-04-19 | Cutting wheel and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7119390A JP3028320B2 (en) | 1995-04-19 | 1995-04-19 | Cutting wheel and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08290362A true JPH08290362A (en) | 1996-11-05 |
| JP3028320B2 JP3028320B2 (en) | 2000-04-04 |
Family
ID=14760324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7119390A Expired - Fee Related JP3028320B2 (en) | 1995-04-19 | 1995-04-19 | Cutting wheel and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3028320B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2803786A1 (en) * | 2000-01-17 | 2001-07-20 | Seva | Cut off grinding disc for power tool has layers of grains of different types superimposed and varying across radius of disc |
| JP2014061552A (en) * | 2012-09-19 | 2014-04-10 | Olympus Corp | Method of producing tool for polishing |
| CN105234845A (en) * | 2015-09-16 | 2016-01-13 | 丹阳市长平机械有限公司 | Grinding wheel for grinding right angle face |
| CN105252447A (en) * | 2015-08-24 | 2016-01-20 | 镇江丰成特种工具有限公司 | Efficient grinding wheel |
| CN105252446A (en) * | 2015-08-24 | 2016-01-20 | 镇江丰成特种工具有限公司 | Preparation technology for efficient abrasion-resistant grinding wheel |
| JP2018202590A (en) * | 2017-06-09 | 2018-12-27 | 信越化学工業株式会社 | External peripheral cutting blade and its manufacturing method |
| CN109834602A (en) * | 2018-12-04 | 2019-06-04 | 卓士豪 | A kind of cutting sheet |
| JP2020069629A (en) * | 2018-11-02 | 2020-05-07 | 株式会社東京精密 | Resin blade and resin blade manufacturing method |
-
1995
- 1995-04-19 JP JP7119390A patent/JP3028320B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2803786A1 (en) * | 2000-01-17 | 2001-07-20 | Seva | Cut off grinding disc for power tool has layers of grains of different types superimposed and varying across radius of disc |
| WO2001053041A1 (en) * | 2000-01-17 | 2001-07-26 | Saint-Gobain Seva | Abrasive grindstone and method for making same |
| US6840850B2 (en) | 2000-01-17 | 2005-01-11 | Saint-Gobain Abrasifs Technologie Et Services | Abrasive grindstone and method for making same |
| KR100774492B1 (en) * | 2000-01-17 | 2007-11-08 | 생-고벵 아브라시프 테크놀러지 엣 서비시즈 | Abrasive wheel, method for manufacturing the abrasive wheel and installation for manufacturing the abrasive wheel |
| JP2014061552A (en) * | 2012-09-19 | 2014-04-10 | Olympus Corp | Method of producing tool for polishing |
| CN105252447A (en) * | 2015-08-24 | 2016-01-20 | 镇江丰成特种工具有限公司 | Efficient grinding wheel |
| CN105252446A (en) * | 2015-08-24 | 2016-01-20 | 镇江丰成特种工具有限公司 | Preparation technology for efficient abrasion-resistant grinding wheel |
| CN105234845A (en) * | 2015-09-16 | 2016-01-13 | 丹阳市长平机械有限公司 | Grinding wheel for grinding right angle face |
| JP2018202590A (en) * | 2017-06-09 | 2018-12-27 | 信越化学工業株式会社 | External peripheral cutting blade and its manufacturing method |
| US11052511B2 (en) | 2017-06-09 | 2021-07-06 | Shin-Etsu Chemical Co., Ltd. | Outer blade cutting wheel and making method |
| JP2020069629A (en) * | 2018-11-02 | 2020-05-07 | 株式会社東京精密 | Resin blade and resin blade manufacturing method |
| CN109834602A (en) * | 2018-12-04 | 2019-06-04 | 卓士豪 | A kind of cutting sheet |
| CN109834602B (en) * | 2018-12-04 | 2021-11-02 | 卓士豪 | Cutting blade |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3028320B2 (en) | 2000-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5247765A (en) | Abrasive product comprising a plurality of discrete composite abrasive pellets in a resilient resin matrix | |
| KR100583717B1 (en) | Grinding wheel | |
| TW394723B (en) | Abrasive tools with patterned grit distribution and method of manufacture | |
| CN103465180A (en) | Slice resin grinding wheel and preparation method thereof | |
| CN108188950A (en) | Super hard abrasive ceramics lump and resin fused alumina zirconia composite wheel | |
| JP2007537890A (en) | Brazed diamond dressing tool | |
| JP4271865B2 (en) | Method for producing sintered articles and products produced thereby | |
| CN101704277B (en) | Manufacture method of multi-layer diamond brazing body | |
| JP3028320B2 (en) | Cutting wheel and its manufacturing method | |
| JP3502971B2 (en) | Cutting wheel | |
| US4448591A (en) | Cutting insert having unique cross section | |
| US2818850A (en) | Cut off blades for abrasive bodies and their production | |
| JP2535684B2 (en) | Grinding wheel and its manufacturing method | |
| JPH0367834B2 (en) | ||
| JPH08118240A (en) | Grinding wheel and its manufacture | |
| JP2014526397A (en) | Fixed abrasive formed by uniaxial hot press molding | |
| US3950149A (en) | Method for continuously producing resinoid wheels | |
| EP1862286A1 (en) | Rigid abrasive tool for facing and shaping stone-like or ceramic materials and associated manufacturing method | |
| RU2650459C1 (en) | Cross-linked diamond tool and method of its production | |
| JP3962966B2 (en) | Grinding wheel equipped with superabrasive grinding wheel and method for manufacturing the same | |
| US20140273778A1 (en) | Grinding tool and method for producing same | |
| US2201191A (en) | Friction material | |
| JPH02250775A (en) | Grinding/polishing grindstone, manufacture thereof and manufacturing device thereof | |
| JPS63207565A (en) | Composite stone for grinding | |
| CN105643479A (en) | Dry-type chamfering wheel and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |