JP4410213B2 - Resinoid cutting wheel and method for manufacturing the same - Google Patents
Resinoid cutting wheel and method for manufacturing the same Download PDFInfo
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本発明は、両側面にフィルムを固定し、金属、樹脂、セラミックス、又はこれらの複合材料等の切断に使用するレジノイド切断砥石に関するものである。 The present invention relates to a resinoid cutting grindstone that is used for cutting a metal, a resin, a ceramic, or a composite material thereof by fixing films on both side surfaces.
従来より、砥粒、フェノール系樹脂などの熱硬化性樹脂、及び充填剤を混合して形成するレジノイド切断砥石が知られている。このレジノイド切断砥石は、砥粒、熱硬化性樹脂、及び充填剤を混合して、円盤状に成形した後、焼成硬化して成るものであり、主に金属、セラミックス、ガラス製品、超硬合金等の被切断物の切断に使用されるものである。そして、上記被切断物を切断する際には、切断箇所を冷却するための切削液を供給しながら行うが、切削液として水溶性切削液を使用した場合に、この水溶性切削液が砥石側面に付着して砥石側面から内部に浸透し易いものとなっていた。 Conventionally, resinoid cutting whetstones formed by mixing abrasive grains, thermosetting resins such as phenolic resins, and fillers are known. This resinoid cutting grindstone is made by mixing abrasive grains, thermosetting resin, and filler, forming into a disk shape, and then baking and curing, mainly metal, ceramics, glass products, cemented carbide It is used for the cutting of objects to be cut. When cutting the workpiece, it is performed while supplying a cutting fluid for cooling the cut portion. When a water-soluble cutting fluid is used as the cutting fluid, the water-soluble cutting fluid is It was easy to permeate into the inside from the side of the grindstone.
そして、水溶性切削液が砥石内部に浸透すると、水溶性切削液中の水分が砥石の熱硬化性樹脂と反応し、熱硬化性樹脂の膨潤や劣化を引き起こすため、砥石の強度低下や歪みが発生して破損するなど、砥石の寿命の低下が生じやすいものとなっていた。そこで、特許文献１に示す如く、側面にエポキシ樹脂等を被覆処理したレジノイド切断砥石が提案されている。即ち、特許文献１のレジノイド切断砥石は、砥石の側面に、スプレーによってエポキシ樹脂やフッ素樹脂を噴霧して、これらの樹脂を砥石の側面に被覆処理したものであり、砥石側面からの水溶性切削液の浸透を防止することを目的としている。
しかしながら、特許文献１に示す発明では、砥石の側面にエポキシ樹脂やフッ素樹脂を均一に塗布することが技術的に難しく、塗布に手間がかかり作業効率が悪いものとなっていた。また、従来のレジノイド切断砥石及び特許文献１のレジノイド切断砥石は、焼成により熱硬化性樹脂が収縮し、砥粒が砥石側面に突出するため砥石側面に凹凸が生じるものとなっていた。そのため、この砥石側面の凹凸が、切断時において被切断物の被切断面に接触し易いものとなり、この接触によって切断抵抗が増加し、切断性能を低下させる原因となっていた。 However, in the invention shown in Patent Document 1, it is technically difficult to uniformly apply an epoxy resin or a fluororesin to the side surface of the grindstone, and it takes time and effort to apply the resin. In addition, the conventional resinoid cutting grindstone and the resinoid cutting grindstone of Patent Document 1 are such that the thermosetting resin contracts by firing, and the abrasive grains protrude from the side of the grindstone, thereby causing irregularities on the side of the grindstone. Therefore, the irregularities on the side surface of the grindstone are likely to come into contact with the surface to be cut at the time of cutting, and this contact increases cutting resistance and causes a reduction in cutting performance.
また、特許文献１及び従来のレジノイド切断砥石の外周端部の形状は、被切断物と接触する外周端面と両側面とによりコ字型の断面を形成し、このコ字型の断面の、外周端面と両側面との接続部である角部を９０度に形成している。そして、この９０度の角部が、被切断物の切断により摩耗し、この摩耗によって、作業開始前の未使用時はコ字型の直角であった角部外周端面の中央部が突出した湾曲形状に変形しやすいものとなっていた。 Moreover, the shape of the outer peripheral end of Patent Document 1 and the conventional resinoid cutting grindstone forms a U-shaped cross section by the outer peripheral end surface and both side surfaces that come into contact with the workpiece, and the outer periphery of this U-shaped cross section. A corner portion which is a connection portion between the end face and both side faces is formed at 90 degrees. Then, the 90 ° corner is worn by cutting the workpiece, and this wear causes the central portion of the outer peripheral end face of the corner to be a U-shaped right angle when not in use before the start of work. It was easily deformed into shape.
この変形は、レジノイド切断砥石の両側面の強度が弱いため、保形性が低くなり砥粒が脱落しやすいことから生じるものであった。そして、このように外周端面が湾曲形状に変形した砥石によって被切断物を切断すると、湾曲した外周端面が被切断物の被切断面に当接し、この被切断面にばり等の凹凸が生じたり、被切断物が脆性材料の場合には、切断終了間際の段階で欠けが生じるなどして、被切断物の被切断面を平滑なものとすることが困難となり、被切断物の品質を低下させるものとなっていた。 This deformation was caused because the strength of both side surfaces of the resinoid cutting grindstone was weak, so that the shape retention was low and the abrasive grains were likely to fall off. Then, when the workpiece is cut with the grindstone whose outer peripheral end surface is deformed in this way, the curved outer peripheral end surface comes into contact with the cut surface of the workpiece, and unevenness such as flash is generated on the cut surface. When the material to be cut is a brittle material, it becomes difficult to smooth the surface to be cut, such as chipping at the stage just before the end of cutting, and the quality of the material to be cut is lowered. It was something to be made.
そこで、本発明は上述の如き課題を解決しようとするものであって、砥石側面への水溶性切削液の浸透を防止可能とするレジノイド切断砥石の製造を容易なものとするとともに、被切断物の切断時の切断抵抗を減少し、切断性能を高めようとするものである。また、レジノイド切断砥石の両側面の強度を高め、切断による砥石の外周端面の変形を少なくして、被切断物の被切断面にばり等の凹凸や欠けを生じにくくしようとするものである。 Accordingly, the present invention is intended to solve the above-described problems, and makes it easy to manufacture a resinoid cutting grindstone that can prevent the penetration of a water-soluble cutting fluid into the side surface of the grindstone, and to be cut. The cutting resistance at the time of cutting is reduced to improve the cutting performance. In addition, the strength of both side surfaces of the resinoid cutting grindstone is increased, and deformation of the outer peripheral end surface of the grindstone due to cutting is reduced, so that unevenness such as flash or chipping is less likely to occur on the cut surface of the workpiece.
本願は上述の如き課題を解決するため、第１の発明は、砥粒、フェノール系樹脂、及び充填剤を混合し、この混合物を板状に形成加工して砥石本体を形成した後、この砥石本体の両側面に、フェノール系樹脂、変性フェノール系樹脂、又はエポキシ・フェノール系樹脂の一種又は複数種から成る有機合成フィルムを被覆して焼成を行い、砥石本体の両側面に有機合成フィルムを固定して有機合成フィルム層を形成するものである。 In order to solve the above-mentioned problems, the first invention is to mix abrasive grains , a phenolic resin , and a filler and form the mixture into a plate shape to form a grindstone main body. on both sides of the body, phenolic resins, modified phenolic resins, or organic synthetic film comprising one or more epoxy-phenolic resin baked coated, the organic synthetic films on both sides of the grinding stone fixed and which forms an organic synthetic film layer.
また、上記製造方法により製造したレジノイド切断砥石である第２の発明は、砥粒、フェノール系樹脂、及び充填剤を混合して板状に形成加工した砥石本体と、この砥石本体の両側面にフェノール系樹脂、変性フェノール系樹脂、又はエポキシ・フェノール系樹脂の一種又は複数種から成る有機合成フィルムを固定して形成した有機合成フィルム層とから成るものである。 The second invention is a resinoid cutting wheels manufactured by the above manufacturing method, the abrasive grain, phenolic resin, and a grinding stone formed processed into a plate shape by mixing the filler, both sides of the abrasive stone body those consisting of phenolic resins, modified phenolic resin, or epoxy-phenolic resin of one or organic consists more synthetic fill beam a fixed organically synthesized film layer formed on.
また、有機合成フィルムは、砥石本体への固定面とは反対側の外面に、剥離剤を介して樹脂製の保護フィルムを止着したものであっても良い。 In addition, the organic synthetic film may be one in which a protective film made of resin is fixed to the outer surface opposite to the surface fixed to the grindstone body via a release agent.
また、砥石本体は、有機合成フィルムを被覆した後、焼成前に減圧室において減圧することにより、両側面に有機合成フィルムを密着させるものであっても良い。 Further, the grindstone main body may be one in which the organic synthetic film is adhered to both side surfaces by covering the organic synthetic film and then reducing the pressure in the decompression chamber before firing.
また、砥石本体は、有機合成フィルムを被覆した後、焼成前に両側面に有機合成フィルムを押し付け加圧することにより、有機合成フィルムを両側面に密着させるものであっても良い。 Further, the grindstone main body may be one in which the organic synthetic film is adhered to both side surfaces by coating the organic synthetic film and pressing the organic synthetic film on both side surfaces before pressurization before firing.
また、砥粒は、ダイヤモンド、立方晶窒化ホウ素、炭化ケイ素、酸化アルミニウム、黒鉛、酸化カルシウムのうちの一種類又は複数種類を含有するものであっても良い。 In addition, the abrasive grains may contain one or more of diamond, cubic boron nitride, silicon carbide, aluminum oxide, graphite, and calcium oxide.
また、有機合成フィルム層は、厚さを３μｍ〜５０μｍとしたものであっても良い。 The organic synthetic film layer may have a thickness of 3 μm to 50 μm.
本発明は上述の如く構成したものであって、砥石本体の両側面に有機合成フィルムを固定して有機合成フィルム層を形成するという簡易な方法により、水溶性切削液が砥石本体の側面から内部に浸透しにくいレジノイド切断砥石を得ることが可能となる。そのため、水溶性切削液と熱硬化性樹脂との反応によって生じる、砥石自体の強度低下や歪みを生じにくいものとし、砥石の寿命低下を防ぐことが可能となる。 The present invention is configured as described above, and the water-soluble cutting fluid is formed from the side surface of the grindstone main body by a simple method of fixing the organic synthetic film on both sides of the grindstone main body to form the organic synthetic film layer. It is possible to obtain a resinoid cutting grindstone that does not easily penetrate into the surface. Therefore, it is possible to prevent a reduction in the strength and distortion of the grindstone itself, which is caused by a reaction between the water-soluble cutting fluid and the thermosetting resin, and to prevent a decrease in the life of the grindstone.
また、有機合成フィルム層を形成することにより砥石本体の両側面が平滑なものとなるため、切断時において砥石の両側面が被切断物の被切断面に接触しても、切断時に生じる砥石の両側面と被切断物の被切断面との間の切断抵抗を低減することが可能となり、切断性能を向上させることができる。 Moreover, since both sides of the grindstone main body become smooth by forming the organic synthetic film layer, even if both sides of the grindstone come into contact with the cut surface of the workpiece during cutting, It becomes possible to reduce the cutting resistance between both side surfaces and the surface to be cut of the object to be cut, and the cutting performance can be improved.
また、有機合成フィルム層によって砥石の両側面の強度を強くすることができるため、砥石の両側面の保形性を高めることが可能となる。そのため、砥石の外周端面と両側面とにより形成されるコ字型の角部の摩耗を低減することが可能となることから、砥石の外周端面をコ字型のほぼ平坦に保つことが可能となる。従って、被切断物の被切断面にばり等の凹凸や欠けを生じにくい平滑なものとすることが可能となり、被切断物の品質を良好なものとすることができる。 In addition, since the strength of both side surfaces of the grindstone can be increased by the organic synthetic film layer, it is possible to improve the shape retention of both side surfaces of the grindstone. Therefore, since it becomes possible to reduce wear of the U-shaped corner formed by the outer peripheral end surface and both side surfaces of the grindstone, it is possible to keep the outer peripheral end surface of the grindstone substantially flat in the U-shape. Become. Accordingly, it becomes possible to make the cut surface of the workpiece to be smooth such that irregularities such as burrs and chips are not easily generated, and the quality of the workpiece can be improved.
以下、本発明の実施例１を図１〜図３に於いて説明すると、図１に示す如く、(１)は砥石本体であって、砥粒(１０)、熱硬化性樹脂、及び充填剤から成るものである。そして、本実施例では砥粒(１０)として１２０メッシュのホワイトアランダム及びグリーン・カーボランダムを使用している。また、熱硬化性樹脂として液体及び粉末のフェノール樹脂を使用し、充填剤として２００メッシュの黒鉛を使用している。そして、上記砥粒(１０)を８０重量％、熱硬化性樹脂を１２重量％、充填剤を８重量％混合し、混練した後、厚さ０．８mmに均一に延ばして直径約２０５mmの円盤状に型抜きをして焼成前の砥石本体(１)を形成する。 Hereinafter, Example 1 of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, (1) is a grindstone body, and abrasive grains (10), a thermosetting resin, and a filler. It consists of In this embodiment, 120 mesh white alundum and green carborundum are used as the abrasive grains (10). In addition, liquid and powdery phenol resins are used as thermosetting resins, and 200 mesh graphite is used as a filler. Then, 80% by weight of the abrasive grains (10), 12% by weight of a thermosetting resin, and 8% by weight of a filler were mixed and kneaded, and then uniformly extended to a thickness of 0.8 mm and a disk having a diameter of about 205 mm. The shape is cut into a shape to form a grindstone body (1) before firing.
次に、上記の如く成形した砥石本体(１)の両側面(６)に、１枚の有機合成フィルム(２)を被覆する。本実施例では、有機合成フィルム(２)として厚さ１５μｍのエポキシ・フェノール系樹脂フィルムを使用している。この有機合成フィルム(２)は疎水性であるため、水分の浸透を防ぐことができる。 Next, one organic synthetic film (2) is coated on both side surfaces (6) of the grindstone body (1) formed as described above. In this embodiment, an epoxy / phenolic resin film having a thickness of 15 μm is used as the organic synthetic film (2). Since this organic synthetic film (2) is hydrophobic, moisture penetration can be prevented.
尚、本発明の有機合成フィルム(２)の厚さは、３μｍ〜５０μｍであることが好ましい。即ち、３μｍ未満であると、作業時に破れたり、穴が空きやすいものとなり、作業性が悪くなり砥石本体(１)の両側面(６)に均一に被覆することが困難となる。また、５０μｍより厚い場合は、切断抵抗が高くなり、被切断物の被切断面が湾曲するなどして被切断物の品質の低下を招くおそれがある。 In addition, it is preferable that the thickness of the organic synthetic film (2) of this invention is 3 micrometers-50 micrometers. That is, when the thickness is less than 3 μm, it becomes easy to be broken or a hole is formed at the time of work, workability is deteriorated, and it is difficult to uniformly coat both side surfaces (6) of the grindstone body (1). On the other hand, when the thickness is larger than 50 μm, the cutting resistance increases, and the surface to be cut of the object to be cut may be curved, leading to a decrease in the quality of the object to be cut.
また、本実施例の有機合成フィルム(２)は上記の如く、２０μｍ未満であって厚さが非常に薄いため、そのまま単体で砥石本体(１)の両側面(６)に被覆しようとすると、両側面(６)全体に均一に被覆するためには高度の技術を必要としたり、被覆の際に細心の注意を払う必要が生じ、作業効率が低下するものとなる。そこで、有機合成フィルム(２)の被覆の際の作業性を良好なものとするため、本実施例では図１及び図２に示す如く、有機合成フィルム(２)の砥石本体(１)への固定側とは反対側の外面に、剥離剤を介して厚さ３８μｍのＰＥＴ製の保護フィルム(３)を止着している。 Further, as described above, the organic synthetic film (2) of this example is less than 20 μm and very thin, so when trying to cover both sides (6) of the grindstone body (1) as it is, In order to uniformly coat the entire side surfaces (6), it is necessary to use a high level of technology, and it is necessary to pay close attention to the coating, resulting in a reduction in work efficiency. Therefore, in order to improve the workability when the organic synthetic film (2) is coated, in this embodiment, as shown in FIGS. 1 and 2, the organic synthetic film (2) is applied to the grindstone body (1). A PET protective film (3) having a thickness of 38 μm is fixed to the outer surface opposite to the fixed side with a release agent.
このように、有機合成フィルム(２)に保護フィルム(３)を止着することにより、砥石本体(１)に被覆する際の厚さが有機合成フィルム(２)単独の場合よりも厚いものとなる。そのため、有機合成フィルム(２)を砥石本体(１)に被覆する際にしわが生じにくくなり、砥石本体(１)に有機合成フィルム(２)を容易に均一に被覆することが可能となる。 Thus, by attaching the protective film (3) to the organic synthetic film (2), the thickness when coating the grindstone main body (1) is thicker than in the case of the organic synthetic film (2) alone. Become. Therefore, wrinkles are less likely to occur when the organic synthetic film (2) is coated on the grindstone main body (1), and the organic synthetic film (2) can be easily and uniformly coated on the grindstone main body (1).
尚、本実施例では保護フィルム(３)としてＰＥＴを使用しているが、他の異なる実施例では、ＰＥＴのみならず、ポリエチレンフィルム等の樹脂フィルムを使用してもよい。また、本実施例では上記の如く、有機合成フィルム(２)に保護フィルム(３)を止着して使用しているが、有機合成フィルム(２)の厚さが２０μｍ以上の比較的厚いものを使用する場合には、保護フィルム(３)を止着せずに、有機合成フィルム(２)のみを砥石本体(１)の両側面(６)に均一に被覆することが容易となる。 In this embodiment, PET is used as the protective film (3). However, in other different embodiments, not only PET but also a resin film such as a polyethylene film may be used. In this embodiment, as described above, the protective film (3) is fixed to the organic synthetic film (2), but the organic synthetic film (2) is relatively thick with a thickness of 20 μm or more. Is used, it is easy to uniformly coat only the organic synthetic film (2) on both side surfaces (6) of the grindstone body (1) without fixing the protective film (3).
そして、上記の如く砥石本体(１)の両側面(６)に、保護フィルム(３)を止着した有機合成フィルム(２)を被覆した状態で、密閉した減圧室において約１０-1Ｐａで３０秒間減圧することにより、砥石本体(１)と有機合成フィルム(２)との間に介在する空気を抜気して有機合成フィルム(２)と砥石本体(１)の両側面(６)とを密着させる。尚、本実施例では減圧のみによって有機合成フィルム(２)と砥石本体(１)の両側面(６)とを密着させているが、他の異なる実施例では、減圧して密着させた後、更に６０℃で約５分間加熱することにより有機合成フィルム(２)を軟化させ、有機合成フィルム(２)と砥石本体(１)の両側面(６)との密着性を高めることが可能となる。また、有機合成フィルム(２)を砥石本体(１)の両側面(６)に被覆した後、減圧や加熱を行わずに、有機合成フィルム(２)を押し付け加圧することにより、有機合成フィルム(２)を砥石本体(１)の両側面(６)に密着させることも可能である。 Then, as described above, the both sides (6) of the grindstone body (1) are covered with the organic synthetic film (2) to which the protective film (3) is fixed, and in a sealed decompression chamber at about 10 <-1> Pa at 30. By reducing the pressure for 2 seconds, the air intervening between the grindstone main body (1) and the organic synthetic film (2) is evacuated, and the organic synthetic film (2) and both side surfaces (6) of the grindstone main body (1) are removed. Adhere closely. In this embodiment, the organic synthetic film (2) and the both side surfaces (6) of the grindstone main body (1) are brought into close contact with each other only by reducing the pressure. Furthermore, by heating at 60 ° C. for about 5 minutes, the organic synthetic film (2) is softened, and the adhesion between the organic synthetic film (2) and both side surfaces (6) of the grindstone body (1) can be improved. . Moreover, after coating the organic synthetic film (2) on both side surfaces (6) of the grindstone main body (1), the organic synthetic film (2) is pressed and pressurized without performing decompression or heating, so that the organic synthetic film ( 2) can be brought into close contact with both side surfaces (6) of the grindstone body (1).
そして、このように有機合成フィルム(２)と砥石本体(１)の両側面(６)とを密着させた後、約２００℃で１時間焼成する。この焼成によって、有機合成フィルム(２)の砥石本体(１)側の内面と、砥石本体(１)の両側面(６)の熱硬化性樹脂とが化学的に反応して縮重合を起こす。そして、この反応により砥石本体(１)の両側面(６)に有機合成フィルム(２)が離脱不能に固定され、有機合成フィルム層(４)が形成されるものとなる。 Then, after the organic synthetic film (2) and the both side surfaces (6) of the grindstone main body (1) are brought into close contact with each other in this way, it is fired at about 200 ° C. for 1 hour. By this firing, the inner surface of the organic synthetic film (2) on the side of the grindstone body (1) and the thermosetting resin on both sides (6) of the grindstone body (1) chemically react to cause condensation polymerization. And by this reaction, an organic synthetic film (2) is fixed to both sides (6) of a grindstone main body (1) so that it cannot be detached, and an organic synthetic film layer (4) is formed.
尚、本実施例では、砥石本体(１)の両側面(６)に有機合成フィルム(２)を１枚のみ固定して有機合成フィルム層(４)を形成しているが、他の異なる実施例では、砥石本体(１)の両側面(６)に有機合成フィルム(２)を複数枚重ねて固定し、有機合成フィルム層(４)を形成することも可能である。このように有機合成フィルム(２)を複数枚重ねて有機合成フィルム層(４)を形成することにより、砥石の両側面(６)の強度を更に強いものとすることが可能となり、切断性能をより向上させることができる。 In this embodiment, only one organic synthetic film (2) is fixed to both sides (6) of the grindstone body (1) to form the organic synthetic film layer (4). In the example, the organic synthetic film layer (4) can be formed by stacking and fixing a plurality of organic synthetic films (2) on both side surfaces (6) of the grindstone body (1). In this way, by forming a plurality of organic synthetic films (2) to form an organic synthetic film layer (4), it becomes possible to further increase the strength of both side surfaces (6) of the grindstone and to improve cutting performance. It can be improved further.
このように、砥石本体(１)の両側面(６)に疎水性の有機合成フィルム(２)を被覆固定し、有機合成フィルム層(４)を形成するという簡易な製造方法により、砥石本体(１)の内部に水分が浸透しにくいレジノイド切断砥石を得ることができる。そのため、水溶性切削液と熱硬化性樹脂との反応によって生じる、砥石の強度低下や歪みを生じにくいものとし、砥石の寿命低下を防ぐことが可能となる。そして、上記の如く焼成した後に、切断機の回転軸に装着するための直径２５．４mmの中心穴(５)を貫通形成する。 Thus, the grindstone main body (1) can be formed by a simple manufacturing method in which the hydrophobic organic synthetic film (2) is coated and fixed on both side surfaces (6) of the grindstone main body (1) to form the organic synthetic film layer (4). A resinoid cutting grindstone in which moisture hardly penetrates into 1) can be obtained. Therefore, it is possible to prevent a reduction in the strength and distortion of the grindstone caused by the reaction between the water-soluble cutting fluid and the thermosetting resin, and to prevent a decrease in the life of the grindstone. Then, after firing as described above, a central hole (5) having a diameter of 25.4 mm for mounting on the rotary shaft of the cutting machine is formed through.
尚、本実施例及び上記他の異なる実施例では、減圧、減圧及び加熱、及び加圧によって有機合成フィルム(２)と砥石本体(１)の両側面(６)とを密着させた後、焼成を行ったが、このような密着を行わずに、有機合成フィルム(２)を砥石本体(１)の両側面(６)に被覆した後、そのまま焼成を行うことも可能である。 In this embodiment and the other embodiments described above, the organic synthetic film (2) and both side surfaces (6) of the grindstone body (1) are brought into close contact with each other by decompression, decompression and heating, and pressurization, followed by firing. However, the organic synthetic film (2) can be fired as it is after the organic synthetic film (2) is coated on both side surfaces (6) of the grindstone body (1) without performing such adhesion.
尚、本実施例のレジノイド切断砥石を使用する際には、図３に示す如く、有機合成フィルム(２)に止着した保護フィルム(３)を取り除いた状態とする。そして、保護フィルム(３)を取り除く際には、保護フィルム(３)と有機合成フィルム(２)の間に剥離剤が介在しているため、保護フィルム(３)を有機合成フィルム層(４)から円滑に取り除くことが可能となる。 In addition, when using the resinoid cutting grindstone of a present Example, as shown in FIG. 3, it is set as the state which removed the protective film (3) fixed to the organic synthetic film (2). And when removing protective film (3), since a release agent exists between protective film (3) and organic synthetic film (2), protective film (3) is organic synthetic film layer (4). Can be removed smoothly.
上記の如く形成したものにおいて、切断試験と曲げ試験を行った。また、これらの試験では、本実施例の比較例として、有機合成フィルム層(４)を形成せず、形状及び組成を本実施例の砥石本体(１)と同一とするとともに、約２００℃で１時間焼成したレジノイド切断砥石を使用し、本実施例と同様に試験を行った。 A cutting test and a bending test were performed on the product formed as described above. In these tests, as a comparative example of this example, the organic synthetic film layer (4) was not formed, the shape and the composition were the same as those of the grindstone body (1) of this example, and at about 200 ° C. A test was conducted in the same manner as in this example using a resinoid cutting grindstone fired for 1 hour.
まず、１３mm角のステンレス鋼材(ＳＵＳ３０４)を被切断物として、被削物
移動式手動切断機(平和テクニカ社製：N−７)と砥石移動式自動切断機(平和テクニカ社製：ＨＳ−４５Ａ)にて切断試験を行った。また、切断時には、毎分１０リットルの水溶性切削液を供給することにより、切断箇所を冷却しながら行った。また、レジノイド切断砥石の回転数は、３０００RPM一定とした。
First, using a 13 mm square stainless steel material (SUS304) as a workpiece, a workpiece moving manual cutting machine (Heiwa Technica: N-7) and a grindstone moving automatic cutting machine (Heiwa Technica: HS-45A) ) Was subjected to a cutting test. Moreover, at the time of a cutting | disconnection, it carried out, cooling the cutting location by supplying 10 liters of water-soluble cutting fluid per minute. The rotational speed of the resinoid cutting grindstone was constant at 3000 RPM.
そして、被削物移動式手動切断機による切断試験では、被切断物の切断時間と砥石摩耗量を計測した。その結果を表１に示す。
And in the cutting test by the workpiece moving manual cutting machine, the cutting time and the grinding wheel wear amount of the workpiece were measured. The results are shown in Table 1.
次に、砥石移動式自動切断機による切断試験では、電流計にて切断負荷の最大値と砥石摩耗量を計測した。その結果を表２に示す。
Next, in the cutting test by the grindstone moving automatic cutting machine, the maximum value of the cutting load and the grinding wheel wear amount were measured with an ammeter. The results are shown in Table 2.
尚、表１及び表２の「切断数」は、試験に於いて切断した被切断物の数であり、表１の「平均切断時間」は、各被切断物を切断する際に要する切断時間の平均値、表２の「最大電流平均値(Ａ)」は、各被切断物を切断した際に流れた最大電流の平均値である。また、表１及び表２の「砥石摩耗量」は、全ての被切断物を切断した際に摩耗したレジノイド切断砥石の全摩耗量であり、「切断比」は、各被切断物を切断した際のレジノイド切断砥石の１個当たりの平均摩耗量である。 The “number of cuts” in Tables 1 and 2 is the number of objects to be cut in the test, and the “average cutting time” in Table 1 is the average of the cutting time required for cutting each object to be cut. The value, “maximum current average value (A)” in Table 2, is the average value of the maximum current that flows when each workpiece is cut. Further, “Wheel wear amount” in Table 1 and Table 2 is the total wear amount of the resinoid cutting whetstone worn when all the workpieces are cut, and “Cutting ratio” cuts each workpiece. It is the average amount of wear per one resinoid cutting grindstone.
そして、表１より、被削物移動式手動切断機による切断の際の、実施例１の平均切断時間は、比較例１よりも短く、また、実施例１の平均摩耗量は、比較例１よりも少ない結果となった。また、表２より、実施例１の最大電流平均値は、比較例１よりも低い値を示し、実施例１の平均摩耗量は、比較例１よりも少ない結果となった。以上の結果より、本実施例のレジノイド切断砥石は、切断時に生じる焼けが比較例１のものよりも低く、また、砥石の摩耗量も少ないことが確認できた。 And from Table 1, the average cutting time of Example 1 at the time of the cutting | disconnection by a workpiece moving manual cutting machine is shorter than Comparative Example 1, and the average amount of wear of Example 1 is Comparative Example 1. Results were less than. From Table 2, the maximum average current value of Example 1 was lower than that of Comparative Example 1, and the average wear amount of Example 1 was smaller than that of Comparative Example 1. From the above results, it was confirmed that the resinoid cutting grindstone of this example had lower burn than that of Comparative Example 1 and a smaller amount of wear of the grindstone.
次に、本実施例及び比較例１について、曲げ試験を行った。この曲げ試験は、ＪＩＳ Ｚ ２２４８の金属材料曲げ試験方法に基づいて行ったものであり、本実施例及び比較例１のレジノイド切断砥石をＪＩＳ Ｚ ２２０３の規格に基づいた形状及び寸法に加工した試験片を、押曲げ法により試験片が破断するまで押し曲げ、この押し曲げに要した最大強度を測定した。 Next, a bending test was performed on this example and comparative example 1. This bending test was performed based on the metal material bending test method of JIS Z 2248, and a test in which the resinoid cutting grindstone of this example and Comparative Example 1 was processed into a shape and dimensions based on the standard of JIS Z 2203. The piece was pushed and bent by the bending method until the test piece was broken, and the maximum strength required for this pushing and bending was measured.
そして、上記試験片を本実施例及び比較例１でそれぞれ７片用意し、各片についてそれ
ぞれ試験を行った。その結果、本実施例の平均強度は４０ＭＰａであるのに対し、比較例の平均強度は３０ＭＰａであった。従って、本実施例の強度は比較例の強度よりも１０ＭＰａ程度高いことが確認された。また、本実施例のレジノイド切断砥石にて切断した被切断物の被切断面は、実体顕微鏡による観察により、比較例１の被切断面と比べて凹凸が少なく、より平滑であることが確認できた。
Then, seven test pieces were prepared for each of the present example and comparative example 1, and the test was performed for each piece. As a result, the average strength of this example was 40 MPa, whereas the average strength of the comparative example was 30 MPa. Therefore, it was confirmed that the strength of this example was about 10 MPa higher than the strength of the comparative example. In addition, the surface to be cut of the object cut by the resinoid cutting grindstone of the present example can be confirmed to be smoother with less irregularities than the surface to be cut of Comparative Example 1 by observation with a stereomicroscope. It was.
以上より、本実施例は従来のものよりも、両側面(６)の強度が高く、切断抵抗が低い上に摩耗量を少ないものとすることができるため、切断性能が良好であるとともに、切断時の耐久性に優れたものとなる。また、両側面(６)の強度が高くなることにより両側面(６)の保形性が向上するため、作業前の未使用時には直角であった両側面(６)と外周端面(７)とで形成される角部(８)の摩耗が減少する。従って、切断による外周端面(７)の変形が生じにくいものとなり、外周端面(７)をほぼ平坦な状態に保つことが可能となる。そのため、被切断物の被切断面を、ばりや欠けの少ない平滑なものとすることが可能となり、被切断物の品質を良好なものとすることができる。 As described above, the present embodiment has higher strength on both side surfaces (6) than the conventional one, lower cutting resistance and less wear, so that the cutting performance is good and the cutting performance is good. It is excellent in durability at the time. Moreover, since the shape retention of both side surfaces (6) is improved by increasing the strength of both side surfaces (6), both the side surfaces (6) and the outer peripheral end surface (7) that were perpendicular to each other when not in use before work The wear of the corners (8) formed by is reduced. Therefore, the outer peripheral end face (7) is hardly deformed by cutting, and the outer peripheral end face (7) can be kept substantially flat. Therefore, the surface to be cut of the object to be cut can be made smooth with few burrs and chips, and the quality of the object to be cut can be improved.
１ 砥石本体
２ 有機合成フィルム
３ 保護フィルム
４ 有機合成フィルム層
６ 両側面
１０ 砥粒
DESCRIPTION OF SYMBOLS 1 Grindstone body 2 Organic synthetic film 3 Protective film 4 Organic synthetic film layer 6 Both sides 10 Abrasive grain
Claims (10)
5. The resinoid cutting grindstone according to claim 2 , wherein the organic synthetic film layer has a thickness of 3 μm to 50 μm.
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| US9486896B2 (en) | 2012-06-28 | 2016-11-08 | Saint-Gobain Abrasives, Inc. | Abrasive article and coating |
| US9844853B2 (en) | 2014-12-30 | 2017-12-19 | Saint-Gobain Abrasives, Inc./Saint-Gobain Abrasifs | Abrasive tools and methods for forming same |
| US10189145B2 (en) | 2015-12-30 | 2019-01-29 | Saint-Gobain Abrasives, Inc. | Abrasive tools and methods for forming same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9486896B2 (en) | 2012-06-28 | 2016-11-08 | Saint-Gobain Abrasives, Inc. | Abrasive article and coating |
| US9844853B2 (en) | 2014-12-30 | 2017-12-19 | Saint-Gobain Abrasives, Inc./Saint-Gobain Abrasifs | Abrasive tools and methods for forming same |
| US10189146B2 (en) | 2014-12-30 | 2019-01-29 | Saint-Gobain Abrasives, Inc. | Abrasive tools and methods for forming same |
| US10189145B2 (en) | 2015-12-30 | 2019-01-29 | Saint-Gobain Abrasives, Inc. | Abrasive tools and methods for forming same |
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