JP7087284B2 - Manufacturing method of outer peripheral cutting blade - Google Patents
Manufacturing method of outer peripheral cutting blade Download PDFInfo
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- JP7087284B2 JP7087284B2 JP2017114180A JP2017114180A JP7087284B2 JP 7087284 B2 JP7087284 B2 JP 7087284B2 JP 2017114180 A JP2017114180 A JP 2017114180A JP 2017114180 A JP2017114180 A JP 2017114180A JP 7087284 B2 JP7087284 B2 JP 7087284B2
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- outer peripheral
- base plate
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- grindstone blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/12—Cut-off wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0018—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by electrolytic deposition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
- B24D3/28—Resins or natural or synthetic macromolecular compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/121—Circular saw blades
Description
本発明は、希土類焼結磁石の切断に好適な外周切断刃の製造方法に関する。 The present invention relates to a method for manufacturing an outer peripheral cutting blade suitable for cutting a rare earth sintered magnet.
希土類焼結磁石の切断加工として、外周切断刃による切断加工方法が知られている。この方法は、一般的な切断機に外周切断刃を装着して切断する方法で、寸法精度がよく、加工速度も速いことが特徴であり、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。 As a cutting process for rare earth sintered magnets, a cutting process method using an outer peripheral cutting blade is known. This method is a method of mounting an outer peripheral cutting blade on a general cutting machine and cutting. It is characterized by good dimensional accuracy and high processing speed, and as a processing method with excellent mass productivity, rare earth sintered magnets. Widely used for cutting.
希土類永久磁石を切断する外周刃としては、超硬合金台板の機械加工が施された外周部に、金属(メタルボンド)や樹脂(レジンボンド)などで、ダイヤモンド砥粒やcBN砥粒を固着したものが用いられている。超硬合金台板にダイヤモンド砥粒やcBN砥粒を固着することによって、従来の合金工具鋼や高速度鋼に比べて台板の機械的強度が向上し、その結果、加工切断の精度が向上する。また、超硬合金台板を使用して刃を薄くすることによって、歩留まりを向上させることもでき、加工速度も速くすることが可能となった。 As an outer peripheral blade for cutting rare earth permanent magnets, diamond abrasive grains and cBN abrasive grains are fixed to the outer peripheral part of the cemented carbide base plate that has been machined with metal (metal bond) or resin (resin bond). Is used. By fixing diamond abrasive grains and cBN abrasive grains to the cemented carbide base plate, the mechanical strength of the base plate is improved compared to conventional alloy tool steel and high-speed steel, and as a result, the accuracy of machining cutting is improved. do. In addition, by using a cemented carbide base plate to make the blade thinner, the yield can be improved and the processing speed can be increased.
WCをNiやCoなどで焼結したいわゆる超硬合金は、450~700GPaものヤング率をもつ高剛性の材料であり、200GPa程度の鉄鋼合金系材料より、はるかに強い材料である。ヤング率が高いということは、切断刃にかかる切断抵抗に対して、刃の変形量が少なくなるということであって、同じ切断抵抗なら、刃の曲がりは小さくなり、刃の曲がりを同程度とすれば、刃の厚みを薄くしても同じ加工精度で切断できることになる。超硬合金台板を用いた切断刃を用いた場合、刃の単位面積にかかる切断抵抗はあまり変化しないが、刃が薄くなった分、切断刃全体にかかる切断抵抗は小さくなるので、何枚もの刃を重ねて、同時に何枚もの磁石を一度に切断加工するマルチ切断加工において、切断機全体にかかるトータルの切断抵抗は少なくなる。これにより、同一出力のモーターでも、マルチ切断刃の枚数を多くすることができ、同じ枚数であっても切断の抵抗が少なくなって、切断の寸法精度は向上し、また、モーター電力を節約することもできる。切断抵抗に対するモーターパワーの余裕があれば、砥石の進行を速めて切断時間を短くすることも可能となる。 The so-called cemented carbide obtained by sintering WC with Ni or Co is a highly rigid material having a Young's modulus of 450 to 700 GPa, which is much stronger than a steel alloy-based material of about 200 GPa. A high Young's modulus means that the amount of deformation of the blade is smaller than the cutting resistance applied to the cutting blade, and if the cutting resistance is the same, the bending of the blade is small and the bending of the blade is about the same. Then, even if the thickness of the blade is reduced, it is possible to cut with the same processing accuracy. When a cutting blade using a cemented carbide base plate is used, the cutting resistance applied to the unit area of the blade does not change much, but the cutting resistance applied to the entire cutting blade becomes smaller as the blade becomes thinner, so how many sheets In the multi-cutting process in which multiple blades are stacked and multiple magnets are cut at the same time, the total cutting resistance applied to the entire cutting machine is reduced. As a result, the number of multi-cutting blades can be increased even with the same output motor, the cutting resistance is reduced even with the same number of blades, the dimensional accuracy of cutting is improved, and the motor power is saved. You can also do it. If there is a margin of motor power for the cutting resistance, it is possible to accelerate the progress of the grindstone and shorten the cutting time.
このように、高剛性の超硬合金台板の採用により、外周切断加工の生産性は大いに向上した。しかし、希土類焼結磁石に対する市場からの要求は更に強まっており、加工速度が速くなれば速くなるほど生産性は向上するため、現状の超硬合金台板を用いた切断刃より、更に高速で切断が可能であり、かつ高精度で切断できる外周切断刃の開発が望まれる。 As described above, the productivity of the outer peripheral cutting process is greatly improved by adopting the high-rigidity cemented carbide base plate. However, the market demand for rare earth sintered magnets is increasing, and the faster the processing speed, the higher the productivity. Therefore, cutting at a higher speed than the current cutting blade using a cemented carbide base plate. It is desired to develop an outer peripheral cutting blade that can cut with high accuracy.
外周切断刃を用いて希土類焼結磁石などを切断する場合、加工時に研削液(クーラント)が用いられる。外周切断刃には、被切断物に対する高い寸法精度が求められるが、この寸法精度の向上には、外周切断刃においては、研削液を研削部(切断箇所)に効率よく供給して研削部を冷却できること、研削部で生じる研削屑を効率よく排出できること、チッピングが低減されることなどが有効である。 When cutting a rare earth sintered magnet or the like using an outer peripheral cutting blade, a grinding fluid (coolant) is used during processing. The outer peripheral cutting blade is required to have high dimensional accuracy with respect to the object to be cut. To improve this dimensional accuracy, the outer peripheral cutting blade efficiently supplies the grinding fluid to the grinding part (cutting point) to provide the grinding part. It is effective that it can be cooled, that grinding debris generated in the grinding portion can be efficiently discharged, and that chipping is reduced.
本発明は、上記事情に鑑みなされたものであり、高速切断が可能であり、かつ切断精度が高く、加工歩留まりの向上と加工の低コスト化を実現し得る外周切断刃の製造方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a method for manufacturing an outer peripheral cutting blade capable of high-speed cutting, high cutting accuracy, improvement in processing yield, and reduction in processing cost. The purpose is.
本発明者は、上記目的を達成するため鋭意検討を行った結果、円形リング状薄板の台板の外周部に、砥粒と結合材とを含む砥石刃部が形成された外周切断刃として、砥石刃部の幅方向両端部に、砥石刃部の内周側から外周側に向かう溝が形成されている外周切断刃が、高速切断が可能であり、かつ切断精度が高く、加工歩留まりの向上と加工の低コスト化を実現し得る外周切断刃であることを知見した。 As a result of diligent studies to achieve the above object, the present inventor has provided an outer peripheral cutting blade in which a grindstone blade portion containing abrasive grains and a binder is formed on the outer peripheral portion of a base plate of a circular ring-shaped thin plate. The outer peripheral cutting blade, in which grooves from the inner peripheral side to the outer peripheral side of the grindstone blade are formed at both ends in the width direction of the grindstone blade, enables high-speed cutting, has high cutting accuracy, and improves machining yield. It was found that it is an outer peripheral cutting blade that can realize low processing cost.
そして、このような外周切断刃が、台板の外周部以外の砥石刃部を形成しない部分を被覆するように、台板の両平面を治具で挟持し、治具と、気体及び液体の通過は許容するが、砥粒の通過を許容しない目開きで形成された網状部材とで、台板の外周部に沿って外周部を取り囲むキャビティを形成し、キャビティ内に砥粒を充填してキャビティ内に砥粒を封入し、台板を、治具及び網状部材と共に、めっき液に浸漬し、台板をカソードとして電気めっきし、めっき金属を析出させて、砥粒をめっき金属と共に台板の外周部上に結合させること、この際、治具として、台板の外周部から離間したキャビティの内面の一部を構成する鍔部を有し、鍔部に溝を形成するための突起部が形成されている治具を用いることにより、良好に製造できることを見出し、本発明をなすに至った。 Then, both flat surfaces of the base plate are sandwiched between jigs so that such an outer peripheral cutting blade covers a portion other than the outer peripheral portion of the base plate that does not form a grinding blade portion, and the jig and gas and liquid are used. With a mesh member formed with a mesh that allows passage but does not allow the passage of abrasive grains, a cavity surrounding the outer peripheral portion is formed along the outer peripheral portion of the base plate, and the abrasive grains are filled in the cavity. Abrasive grains are enclosed in the cavity, the base plate is immersed in a plating solution together with a jig and a mesh member, electroplating using the base plate as a cathode, precipitation of plating metal is performed, and the abrasive grains are deposited together with the plating metal on the base plate. In this case, as a jig, a flange portion that forms a part of the inner surface of the cavity separated from the outer peripheral portion of the base plate is provided, and a protrusion for forming a groove in the flange portion is provided. It has been found that it can be manufactured satisfactorily by using a jig in which the above-mentioned is formed, and the present invention has been made.
即ち、本発明は、下記外周切断刃の製造方法を提供する。
請求項1:
円形リング状薄板の台板の外周部に、砥粒と、電気めっき金属である結合材とを含む砥石刃部が形成され、上記砥石刃部の幅方向両端側の面が、上記台板の両平面と並行な平面形状を有し、上記砥石刃部の幅方向両端部に、上記砥石刃部の内周側から外周側に溝が形成されており、上記溝が、研削液を保持するための溝、又は砥石刃部と被切断物との接触面積を少なくするための溝である外周切断刃を製造する方法であって、
上記台板の外周部以外の上記砥石刃部を形成しない部分を被覆するように、上記台板の両平面を治具で挟持し、上記治具と、気体及び液体の通過は許容するが、上記砥粒の通過を許容しない目開きで形成された網状部材とで、上記台板の外周部に沿って該外周部を取り囲むキャビティを形成する工程、
該キャビティ内に上記砥粒を充填して上記キャビティ内に上記砥粒を封入する工程、
上記台板を、上記治具及び網状部材と共に、めっき液に浸漬する工程、及び
上記台板をカソードとして電気めっきし、めっき金属を析出させて、上記砥粒を上記めっき金属と共に上記台板の外周部上に結合させる工程を含み、
上記治具が、上記台板の外周部から離間した上記キャビティの内面の一部を構成する鍔部を有し、該鍔部に上記溝を形成するための突起部が形成されていることを特徴とする外周切断刃の製造方法。
請求項2:
上記溝の上記砥石刃部の内周面側及び外周面側の双方が貫通している、又は上記溝の上記砥石刃部の内周面側が貫通し、外周面側が閉塞していることを特徴とする請求項1記載の製造方法。
請求項3:
上記溝が、上記台板のラジアル方向に、又は該ラジアル方向に対して60°以下の角度で傾斜して形成されていることを特徴とする請求項1又は2記載の製造方法。
請求項4:
上記溝が、上記台板に達している、又は上記台板の外周部の表面上に上記結合材と同様の材料で形成された下地層に達していることを特徴とする請求項1乃至3のいずれか1項記載の製造方法。
請求項5:
上記溝が、研削液を保持するための溝であることを特徴とする請求項1乃至4のいずれか1項記載の製造方法。
請求項6:
上記砥石刃部における上記溝の割合が、砥石刃部の上記幅方向両端側から見た側面図において、砥石刃部の全面積に対して、溝の部分の総面積の割合が、10~50%であることを特徴とする請求項1乃至5のいずれか1項記載の製造方法。
請求項7:
上記溝の幅が、1~10mmであることを特徴とする請求項1乃至6のいずれか1項記載の製造方法。
請求項8:
上記溝が、直線状、円弧状又は楕円弧状の溝であることを特徴とする請求項7記載の製造方法。
また、本発明は、下記外周切断刃が関連する。
[1]円形リング状薄板の台板の外周部に、砥粒と結合材とを含む砥石刃部が形成された外周切断刃であって、
上記砥石刃部の幅方向両端部に、上記砥石刃部の内周側から外周側に向かう溝が形成されていることを特徴とする外周切断刃。
[2]上記溝の上記砥石刃部の内周面側及び外周面側の双方が貫通している、又は上記溝の上記砥石刃部の内周面側が貫通し、外周面側が閉塞していることを特徴とする[1]記載の外周切断刃。
[3]上記溝が、上記台板のラジアル方向に沿って、又は該ラジアル方向に対して60°以下の角度で傾斜して形成されていることを特徴とする[1]又は[2]記載の外周切断刃。
[4]上記溝が、上記台板又は上記台板の表面上に形成された下地層に達していることを特徴とする[1]乃至[3]のいずれかに記載の外周切断刃。
[5]上記結合材が電気めっき金属であることを特徴とする[1]乃至[4]のいずれかに記載の外周切断刃。
That is, the present invention provides the following method for manufacturing an outer peripheral cutting blade.
Claim 1:
A grindstone blade portion containing abrasive grains and a binder which is an electroplated metal is formed on the outer peripheral portion of the base plate of the circular ring-shaped thin plate, and the surfaces of the grindstone blade portion on both ends in the width direction of the base plate. It has a planar shape parallel to both planes, and grooves are formed on both ends of the grindstone blade portion in the width direction from the inner peripheral side to the outer peripheral side of the grindstone blade portion, and the grooves hold the grinding fluid. A method for manufacturing an outer peripheral cutting blade, which is a groove for reducing the contact area between the grindstone blade and the object to be cut .
Both planes of the base plate are sandwiched between jigs so as to cover the portion other than the outer peripheral portion of the base plate that does not form the grindstone blade portion, and the jig and the gas and liquid are allowed to pass through. A step of forming a cavity surrounding the outer peripheral portion along the outer peripheral portion of the base plate with a mesh member formed of a mesh that does not allow the passage of the abrasive grains.
A step of filling the cavity with the abrasive grains and enclosing the abrasive grains in the cavity.
The step of immersing the base plate together with the jig and the mesh member in the plating solution, and electroplating the base plate as a cathode to precipitate the plating metal, and the abrasive grains together with the plating metal of the base plate. Including the step of bonding on the outer peripheral part
The jig has a flange portion that forms a part of the inner surface of the cavity separated from the outer peripheral portion of the base plate, and the flange portion is formed with a protrusion for forming the groove. A characteristic method for manufacturing an outer peripheral cutting blade.
Claim 2:
It is characterized in that both the inner peripheral surface side and the outer peripheral surface side of the grindstone blade portion of the groove penetrate, or the inner peripheral surface side of the grindstone blade portion of the groove penetrates and the outer peripheral surface side is closed. The manufacturing method according to
Claim 3:
The manufacturing method according to claim 1 or 2, wherein the groove is formed so as to be inclined in the radial direction of the base plate or at an angle of 60 ° or less with respect to the radial direction.
Claim 4:
Claim 5:
The manufacturing method according to any one of
Claim 6:
The ratio of the groove in the grindstone blade portion is 10 to 50 in the side view of the grindstone blade portion when viewed from both ends in the width direction. The production method according to any one of
Claim 7:
The manufacturing method according to any one of
Claim 8:
The manufacturing method according to claim 7, wherein the groove is a linear, arc-shaped, or elliptical arc-shaped groove.
Further, the present invention relates to the following outer peripheral cutting blade.
[1] An outer peripheral cutting blade in which a grindstone blade portion containing abrasive grains and a binder is formed on the outer peripheral portion of a base plate of a circular ring-shaped thin plate.
An outer peripheral cutting blade characterized in that grooves are formed at both ends of the grindstone blade portion in the width direction from the inner peripheral side to the outer peripheral side of the grindstone blade portion.
[2] Both the inner peripheral surface side and the outer peripheral surface side of the grindstone blade portion of the groove penetrate, or the inner peripheral surface side of the grindstone blade portion of the groove penetrates and the outer peripheral surface side is closed. The outer peripheral cutting blade according to [1].
[3] The description of [1] or [2], wherein the groove is formed so as to be inclined along the radial direction of the base plate or at an angle of 60 ° or less with respect to the radial direction. Outer circumference cutting blade.
[4] The outer peripheral cutting blade according to any one of [1] to [3], wherein the groove reaches the base plate or the base layer formed on the surface of the base plate.
[5] The outer peripheral cutting blade according to any one of [1] to [4], wherein the binder is an electroplated metal.
本発明で提供される外周切断刃を用いることで、高い送り速度で切断加工を行っても、精度良く、低い切断負荷で加工でき、加工歩留まりの向上と加工の低コスト化を図ることができる。 By using the outer peripheral cutting blade provided in the present invention, even if cutting is performed at a high feed rate, processing can be performed with high accuracy and a low cutting load, and the processing yield can be improved and the processing cost can be reduced. ..
以下、本発明について、更に詳しく説明する。
本発明の外周切断刃は、円形リング状薄板の台板の外周部に、砥粒と結合材とを含む砥石刃部が形成されている。具体的には、例えば、図1に示されるようなものが挙げられる。図1は、本発明の外周切断刃の一例を示す図であり、(A)は側面図、(B)は外周切断刃の回転軸に沿った面における縦断面図である。この外周切断刃10では、内穴1aを有する円形リング状薄板の台板1の外周部に、結合材により砥粒が結合された砥石刃部(切り刃部)2が形成されている。なお、図1中、aは、外周切断刃10の回転軸を示している。
Hereinafter, the present invention will be described in more detail.
In the outer peripheral cutting blade of the present invention, a grindstone blade portion containing abrasive grains and a binder is formed on the outer peripheral portion of a base plate of a circular ring-shaped thin plate. Specifically, for example, the one shown in FIG. 1 can be mentioned. 1A and 1B are views showing an example of an outer peripheral cutting blade of the present invention, FIG. 1A is a side view, and FIG. 1B is a vertical cross-sectional view of a surface of the outer peripheral cutting blade along the rotation axis. In the outer
台板は、超硬合金製のものが好ましく、具体的には、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ることが特に好ましい。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導電性を有するか、又は、パラジウム触媒などによって導電性を付与できるものが好ましい。台板のサイズは、外径が80mm以上、特に100mm以上で、200mm以下、特に180mm以下、内径が30mm以上、特に40mm以上で、80mm以下、特に70mm以下、厚みが0.1mm以上、特に0.2mm以上で、1.0mm以下、特に0.8mm以下が好適である。 The base plate is preferably made of cemented carbide, and specifically, Fe is a carbide powder of a metal belonging to Group IVB, VB, and VIB of the periodic table such as WC, TiC, MoC, NbC, TaC, and Cr 3C 2 . , Co, Ni, Mo, Cu, Pb, Sn, or alloys sintered and bonded using these alloys are preferable, and among these, WC-Co-based, WC-Ti-based, C-Co-based, and WC-TiC are particularly preferable. -It is particularly preferable to use a representative TaC-Co system. Further, among these cemented carbides, those having conductivity enough to be plated or being able to be imparted with conductivity by a palladium catalyst or the like are preferable. The size of the base plate is 80 mm or more, especially 100 mm or more, 200 mm or less, especially 180 mm or less, inner diameter 30 mm or more, especially 40 mm or more, 80 mm or less, especially 70 mm or less, thickness 0.1 mm or more, especially 0. It is preferably 2 mm or more and 1.0 mm or less, particularly 0.8 mm or less.
砥石刃部を構成する砥粒としては、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、又はダイヤモンド砥粒とcBN砥粒との混合砥粒を用いることが好ましい。砥粒の大きさは、結合させる台板の厚みにもよるが、平均粒径で10~500μm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易くなり切断能力が低下するおそれがあり、平均粒径500μm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るおそれがある。 As the abrasive grains constituting the grindstone blade, diamond (natural diamond, industrial synthetic diamond) abrasive grains, cBN (cubic boron nitride) abrasive grains, or a mixed abrasive grain of diamond abrasive grains and cBN abrasive grains shall be used. Is preferable. The size of the abrasive grains depends on the thickness of the base plate to be bonded, but the average particle size is preferably 10 to 500 μm. If the average particle size is less than 10 μm, the gap between the abrasive grains is reduced, so that clogging during cutting is likely to occur and the cutting ability may be reduced. If the average particle size exceeds 500 μm, the magnet is cut. Problems such as a rough surface may occur.
結合材としては、金属(この金属には合金が含まれる。)及び樹脂のいずれでもよいが、本発明の外周切断刃の砥石刃部における、後述する所定の形状を容易に形成できる観点から、結合材としては、金属結合材、特に、電気めっき又は無電解めっきによるめっき金属を適用することが好適である。金属結合材としては、Ni、Fe、Co、Sn、Cuから選ばれる1種の金属、又はこれらの金属の2種以上の合金若しくはこれらの金属から選ばれる1種又は2種以上と、B、P、Cなどから選ばれる非金属の1種又は2種以上との合金を用いることができる。 The binder may be either a metal (this metal includes an alloy) or a resin, but from the viewpoint that a predetermined shape described later can be easily formed in the grindstone blade portion of the outer peripheral cutting blade of the present invention. As the bonding material, it is preferable to apply a metal bonding material, particularly a plated metal obtained by electroplating or electroless plating. The metal binder includes one metal selected from Ni, Fe, Co, Sn, and Cu, two or more alloys of these metals, or one or more selected from these metals, and B. Alloys with one or more non-metals selected from P, C and the like can be used.
砥石刃部中の砥粒体積率は、10体積%以上、特に15体積%以上で、80体積%以下、特に75体積%以下の範囲が好ましい。10体積%未満では、切断に寄与する砥粒の割合が少なく、80体積%を超えると切断中の目詰まりが増えるため、どちらの場合でも切断時の抵抗が増え、切断速度を遅くせざるを得なくなるおそれがある。なお、砥石刃部は、通常、砥粒及び結合材のみで構成されるが、例えば、砥石刃部の硬さ、応力、弾性などを調整する目的で、砥粒及び結合材以外の材料を、例えば10体積%以下、特に5体積%以下の体積率で混合してもよい。 The volume fraction of the abrasive grains in the grindstone blade portion is preferably in the range of 10% by volume or more, particularly 15% by volume or more, and 80% by volume or less, particularly 75% by volume or less. If it is less than 10% by volume, the proportion of abrasive grains that contribute to cutting is small, and if it exceeds 80% by volume, clogging during cutting increases. There is a risk that you will not get it. The grindstone blade is usually composed only of abrasive grains and a binder, but for example, for the purpose of adjusting the hardness, stress, elasticity, etc. of the grindstone blade, a material other than the grindstone and the binder is used. For example, the mixture may be mixed at a volume ratio of 10% by volume or less, particularly 5% by volume or less.
本発明の外周切断刃の砥石刃部には、その幅方向両端部に、砥石刃部の内周側から外周側に向かう溝が形成されている。図2は、本発明の外周切断刃及びその砥石刃部の例を示す側面図である。砥石刃部に形成されている溝としては、図2(A)に示されるような、台板1の外周部に形成された砥石刃部2において、砥石刃部2の内周面側及び外周面側の双方が貫通している溝21、図2(B)に示されるような、台板1の外周部に形成された砥石刃部2において、砥石刃部の内周面側が貫通し、外周面側が閉塞している溝21などが挙げられる。また、図2(A)や図2(B)に示されるような、溝が、台板のラジアル方向に沿って形成されているもの以外にも、図2(C)に示されるような、台板のラジアル方向に対して傾斜している溝21も好適である。この場合、傾斜角度は60°以下、特に45°以下が好ましい。更に、溝は、台板又は台板の表面上に形成された下地層に達していても、台板又は台板の表面上に形成された下地層に達していなくてもよい。
The grindstone blade portion of the outer peripheral cutting blade of the present invention is formed with grooves extending from the inner peripheral side to the outer peripheral side of the grindstone blade portion at both ends in the width direction. FIG. 2 is a side view showing an example of the outer peripheral cutting blade of the present invention and the grindstone blade portion thereof. As the groove formed in the grindstone blade portion, in the
従来の外周切断刃の砥石刃部は、その幅方向両端側の面が、台板の両平面と並行な平面形状となっているが、このような形状の場合、砥石刃部の幅方向両端部で研削液が保持されることがなかった。これに対して、本発明の外周切断刃の砥石刃部は、その幅方向両端部に、砥石刃部の内周側から外周側に向かう溝が形成されているため、溝に研削液が保持され、また、砥石刃部と被切断物との接触面積が少なく、両者間の切断抵抗が低減されるため、高速での切断加工が可能となり、また、高速切断加工時の切断精度が、従来と比べて向上する。溝は、どのような形状でもよく、特定の形状である必要はないが、例えば、断面が四角形や半円形又は半楕円形のものが挙げられ、幅1~10mmの直線状又は円弧若しくは楕円弧状の溝が好適である。また、溝は、規則的に配列していなくてもよいが、通常は、等間隔に形成される。更に、砥石刃部における溝の割合は、砥石刃部の幅方向両端側から見た側面図において、砥石刃部の全面積に対して、溝の部分の総面積の割合が、10~50%であることが好ましい。 In the conventional grindstone blade portion of the outer peripheral cutting blade, the surfaces on both ends in the width direction have a planar shape parallel to both planes of the base plate, but in such a shape, both ends in the width direction of the grindstone blade portion. The grindstone was not retained in the section. On the other hand, the grindstone blade portion of the outer peripheral cutting blade of the present invention has grooves formed at both ends in the width direction from the inner peripheral side to the outer peripheral side of the grindstone blade portion, so that the grinding fluid is retained in the grooves. In addition, since the contact area between the grindstone blade and the object to be cut is small and the cutting resistance between the two is reduced, high-speed cutting is possible, and the cutting accuracy during high-speed cutting is conventional. Improves compared to. The groove may have any shape and does not have to have a specific shape, but examples thereof include those having a quadrangular, semi-circular or semi-elliptical cross section, and have a linear, arc or elliptical arc shape having a width of 1 to 10 mm. Grooves are suitable. Further, the grooves do not have to be regularly arranged, but are usually formed at equal intervals. Further, the ratio of the groove in the grindstone blade portion is such that the ratio of the total area of the groove portion to the total area of the grindstone blade portion is 10 to 50% in the side view seen from both ends in the width direction of the grindstone blade portion. Is preferable.
砥石刃部2は、図2に示されるように、台板1の先端部を挟持し、かつ台板1の先端部より先方に突出して形成されており、砥石刃部2の厚みが台板1の厚みより厚くなるように形成される。砥石刃部2の台板1先端部を挟持する一対の挟持部の長さは、それぞれ0.5mm以上、特に1mm以上で、4mm以下、特に3mm以下であることが好ましい。また、これら一対の挟持部の厚みは、それぞれ0.05mm以上、特に0.1mm以上で、0.5mm以下、特に0.25mm以下であることが好ましい。
As shown in FIG. 2, the
一方、砥石刃部2の台板1より先方に突出している突出部の長さは、固定する砥粒の大きさにもよるが、0.05mm以上、特に0.1mm以上で、5mm以下、特に2.5mm以下であることが好ましい。
On the other hand, the length of the protruding portion of the
台板の外周部に砥石刃部を形成して外周切断刃を製造する方法としては、結合材として樹脂を用い、台板の外周部に、砥粒と樹脂を混合して砥石刃部を成形するレジンボンド法でもよいが、結合材として金属を用い、砥粒と金属とを含む砥石刃部を成形するメタルボンド法が好適である。メタルボンド法は、砥粒と金属を混合して砥石刃部を成形するロウ付け法でもよいが、本発明の外周切断刃の砥石刃部における所定の形状を効率よく形成できる観点から、めっき法が特に好ましい。めっき法には、電気めっき法(電着法)と無電解めっき法があるが、特に、電気めっき法が好ましい。めっき液(電気めっき液、無電解めっき液)は、上述した金属結合材を形成できる従来公知のめっき液を用いることができ、めっき条件は、そのめっき液における通常のめっき条件を適用すればよい。アノードは溶解性アノード、不溶性アノードのいずれでもよいが、不溶性アノードが好適である。不溶性アノードとしては、Pt電極、Ti電極などの、電気めっきで用いられる従来公知のアノードを用いればよい。 As a method of forming a grindstone blade portion on the outer peripheral portion of the base plate to manufacture an outer peripheral cutting blade, a resin is used as a binder, and a grindstone blade portion is formed on the outer peripheral portion of the base plate by mixing abrasive grains and resin. Although the resin bond method may be used, a metal bond method in which a metal is used as a binder and a grindstone blade portion containing the abrasive grains and the metal is formed is preferable. The metal bond method may be a brazing method in which abrasive grains and metal are mixed to form a grindstone blade portion, but from the viewpoint of efficiently forming a predetermined shape in the grindstone blade portion of the outer peripheral cutting blade of the present invention, a plating method is used. Is particularly preferable. The plating method includes an electroplating method (electroplating method) and an electroless plating method, and the electroplating method is particularly preferable. As the plating solution (electroplating solution, electroless plating solution), a conventionally known plating solution capable of forming the above-mentioned metal binder can be used, and the plating conditions may be the usual plating conditions in the plating solution. .. The anode may be either a soluble anode or an insoluble anode, but an insoluble anode is preferable. As the insoluble anode, a conventionally known anode used in electroplating such as a Pt electrode and a Ti electrode may be used.
なお、砥石刃部をメタルボンド法により形成する場合、台板の外周部に、予め下地層を形成しておいてもよい。この下地層は、金属結合材で例示した材料と同様の材料で形成することができ、ロウ付け法、めっき法のいずれによって形成してもよい。また、砥粒は、メタルボンド法により台板の外周部に固定する際の結合強度を高めるため、予め、スパッタリング、無電解めっきなどで被覆されているものを用いてもよい。 When the grindstone blade portion is formed by the metal bond method, a base layer may be formed in advance on the outer peripheral portion of the base plate. This base layer can be formed of the same material as the material exemplified for the metal bonding material, and may be formed by either a brazing method or a plating method. Further, the abrasive grains may be those previously coated with sputtering, electroless plating or the like in order to increase the bond strength when the abrasive grains are fixed to the outer peripheral portion of the base plate by the metal bond method.
本発明の外周切断刃の砥石刃部は、その所定の形状を容易に形成できる観点から、結合材を電気めっき金属として、以下の方法により製造することが効果的である。この製造方法には、
(1)台板の外周部以外の砥石刃部を形成しない部分を被覆するように、台板の両平面を治具で挟持し、治具と、気体及び液体の通過は許容するが、砥粒の通過を許容しない目開きで形成された網状部材とで、台板の外周部に沿って外周部を取り囲むキャビティを形成する工程、
(2)キャビティ内に砥粒を充填してキャビティ内に砥粒を封入する工程、
(3)台板を、治具及び網状部材と共に、めっき液に浸漬する工程、及び
(4)台板をカソードとして電気めっきし、めっき金属を析出させて、砥粒をめっき金属と共に台板の外周部上に結合させる工程
が含まれる。ここで、治具として、台板の外周部から離間したキャビティの内面の一部を構成する鍔部を有し、鍔部に溝を形成するための突起部が形成されている冶具を用いることが有効である。
From the viewpoint that the grindstone blade portion of the outer peripheral cutting blade of the present invention can be easily formed into a predetermined shape, it is effective to manufacture the grindstone blade portion by the following method using the binder as an electroplated metal. This manufacturing method has
(1) Both flat surfaces of the base plate are sandwiched between jigs so as to cover the portion other than the outer peripheral portion of the base plate that does not form the grindstone blade portion, and the jig and gas and liquid are allowed to pass through, but the grindstone is grinded. A process of forming a cavity surrounding the outer peripheral portion along the outer peripheral portion of the base plate with a mesh member formed of a mesh that does not allow the passage of grains.
(2) A process of filling the cavity with abrasive grains and enclosing the abrasive grains in the cavity.
(3) The process of immersing the base plate together with the jig and mesh member in the plating solution, and (4) Electroplating the base plate with the base plate as the cathode to precipitate the plating metal, and the abrasive grains together with the plating metal of the base plate. A step of bonding on the outer peripheral portion is included. Here, as a jig, a jig having a flange portion forming a part of the inner surface of the cavity separated from the outer peripheral portion of the base plate and having a protrusion for forming a groove in the flange portion is used. Is valid.
この方法について、図を参照して、より詳しく説明する。図3は、本発明の外周切断刃の製造に好適な治具及び網状部材の図であり(A)は分解側面図、(B)はキャビティが形成された組立された状態の断面図である。まず、台板1の外周部に砥石刃部を形成するので、図3(A)に示されるように、台板の外周部以外の部分を被覆できる治具51、51と、治具51、51と共に台板1の外周部に沿って外周部を取り囲むキャビティを形成できる網状部材52とを準備し、図3(B)に示されるように、台板1の両平面を治具51、51で挟持し、更に、網状部材52を治具51、51の外周面に巻き付けて固定することによって、キャビティcを形成する。網状部材は、金網(例えばSUS製)、樹脂網などを用いることができる。
This method will be described in more detail with reference to the figures. 3A and 3B are views of a jig and a mesh member suitable for manufacturing the outer peripheral cutting blade of the present invention, FIG. 3A is an exploded side view, and FIG. 3B is a cross-sectional view of an assembled state in which a cavity is formed. .. First, since the grindstone blade portion is formed on the outer peripheral portion of the
この場合、治具51は、台板1の外周部から離間し、キャビティcの内面の一部を構成する鍔部51aを有しており、鍔部51aには、砥石刃部に溝を形成するための突起部511が形成されている。また、鍔部51aには、キャビティc内に砥粒を導入するための供給口51bが設けられている。なお、図3中、51cは、供給口51bの閉止栓であり、閉止栓51cは、治具51の鍔部51aの一部を構成する。また、52aは、網状部材52を治具51の外周面上で固定するためのホルダーである。
In this case, the
次に、キャビティ内に砥粒を充填してキャビティc内に砥粒を封入する。図3に示されるような治具51、51を用いる場合、供給口51bから、砥粒を充填すればよく、閉止栓51cを一端取り外し、キャビティc内に必要量の砥粒を充填した後、供給口51bに閉止栓51cを再び取り付ければよい。砥粒の充填は、砥粒を、めっき液や、水などの液体に分散させたスラリーにして充填することもできる。その場合、余分な液体は、網状部材52を通して排出すればよい。
Next, the cavity is filled with abrasive grains and the abrasive grains are sealed in the cavity c. When the
次に、台板1を、治具51、51及び網状部材52と共に、めっき液に浸漬する。これにより、キャビティc内に、めっき液が網状部材52を通して満たされる。
Next, the
次に、台板1(台板1が非導電材料の場合は、台板1の表面上に予め形成しておいた導電性の層)をカソードとして電気めっきする。そして、めっき金属を析出させ、砥粒をめっき金属と共に台板(カソード)1の外周部上に結合させる。電気めっきが進行するにつれて、めっき液は、網状部材52を通してキャビティc内に順次供給される。これにより、キャビティc内が、徐々に、砥粒及びめっき金属で満たされていく。そして、通常は、キャビティc内が砥粒及びめっき金属で完全に満たされた段階で、電気めっきを終了する。
Next, electroplating is performed using the base plate 1 (when the
なお、電気めっき工程中、台板1の両平面を水平に配置することが好ましい。このようにすることにより、砥粒を、自重により台板1の一方の平面に接触又は近接させた状態で、めっき金属により結合させることができ、電気めっき工程の途中で、台板の天地を反転させれば、砥粒を、自重により台板1の他方の平面に接触又は近接させた状態で、めっき金属により結合させることができる。台板の天地の反転は、1回に限られず、複数回繰り返してもよい。また、めっき金属がある程度析出して、砥粒が台板上に固定されれば、その後はキャビティcを開放してもよく、その場合、例えば、網状部材を取り外し、治具を鍔部のないものに取り換えて、後処理としての、電気めっき工程を実施してもよい。
During the electroplating process, it is preferable to arrange both planes of the
本発明の外周切断刃を用いて切断を行う場合、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、いずれも、Yを含む希土類元素から選ばれる1種又は2種以上、以下同じ。)などの希土類焼結磁石(希土類永久磁石)が好適である。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、20~28質量%のR、5~30質量%のFe、3~10質量%のCu、1~5質量%のZr、及び残部Coからなるものが挙げられる。一方、R-Fe-B系希土類焼結磁石としては、5~40質量%のR、0.2~8質量%のB、8質量%以下の磁気特性や耐食性を改善するための添加元素(例えば、C、Al、Si、Ti、V、Cr、Mn、Ni、Cu、Zn、Ga、Zr、Nb、Mo、Ag、Sn、Hf、Ta及びWから選ばれる1種又は2種以上)、及び残部Fe又はFe及びCo(Coは30質量%以下)からなるものが挙げられる。 When cutting is performed using the outer peripheral cutting blade of the present invention, the objects to be cut include an R-Co-based rare earth sintered magnet and an R-Fe-B-based rare earth sintered magnet (R is a rare earth containing Y). Rare earth sintered magnets (rare earth permanent magnets) such as one or more selected from the elements, the same shall apply hereinafter) are suitable. R-Co series rare earth sintered magnets include RCo 5 series and R 2 Co 17 series. Of these, for example, the R 2 Co 17 system consists of 20 to 28% by mass of R, 5 to 30% by mass of Fe, 3 to 10% by mass of Cu, 1 to 5% by mass of Zr, and the balance Co. Can be mentioned. On the other hand, as the R—Fe—B-based rare earth sintered magnet, 5 to 40% by mass of R, 0.2 to 8% by mass of B, and 8% by mass or less of additive elements for improving magnetic properties and corrosion resistance ( For example, one or more selected from C, Al, Si, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Sn, Hf, Ta and W). And the balance Fe or Fe and Co (Co is 30% by mass or less) can be mentioned.
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。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
[実施例1]
台板として、超硬合金K10で形成された、外径131mm、内径60mm、厚み0.4mmの円形リング状薄板を用いた。この台板の外周部には、事前に、NiCl2・6H2Oを70g/L、NiSO4・6H2Oを370g/L、ホウ酸を45g/L、潤滑剤として株式会社JCU(旧社名:荏原ユージライト株式会社)製#82を2g/L含む電気ニッケルめっき液を用い、浴温度を55℃として電気ニッケルめっきを施して、下地層としてニッケル皮膜を形成しておいた。
[Example 1]
As the base plate, a circular ring-shaped thin plate having an outer diameter of 131 mm, an inner diameter of 60 mm, and a thickness of 0.4 mm, which was made of cemented carbide K10, was used. On the outer periphery of this base plate, NiCl 2.6H 2 O is 70 g / L, NiSO 4.6H 2 O is 370 g / L, boric acid is 45 g / L, and JCU Co., Ltd. (former company name) is used as a lubricant. : An electric nickel plating solution containing 2 g / L of # 82 manufactured by Ebara Corporation (Ebara Corporation) was used, and nickel plating was performed at a bath temperature of 55 ° C. to form a nickel film as an underlayer.
次に、下地層を形成した台板に対して、図3に示される治具及び網状部材を用いて、台板の外周部にそって、外周部を取り囲むキャビティを形成し、閉止栓を外して、供給口からキャビティ内に、ダイヤモンド砥粒(ASTM #230/270)を、後述するめっき液に分散させたスラリーとして充填し、閉止栓を閉めて封入した。この場合、鍔部間の距離を0.6mmとして、砥石刃部の幅を0.6mm(挟持部の厚みは、各々0.1mm)に設定し、また、砥石刃部の台板先端部を挟持する挟持部の長さを、各々3mmに設定し、台板の先端から網状部材までの距離を2mmとして、突出部の長さを2mmに設定した。一方、溝は、幅が2mm、長さが2mm、深さが0.1mmの、台板のラジアル方向に沿った直線状で、台板の外周部に沿って、両平面の各々に36箇所、等間隔に形成されるように設定した。なお、これらの溝は、いずれも台板上の下地層に達するようにした。 Next, for the base plate on which the base layer is formed, a cavity surrounding the outer peripheral portion is formed along the outer peripheral portion of the base plate by using the jig and the mesh member shown in FIG. 3, and the closing plug is removed. Then, diamond abrasive grains (ASTM # 230/270) were filled into the cavity from the supply port as a slurry dispersed in a plating solution described later, and the closing stopper was closed and sealed. In this case, the distance between the flanges is set to 0.6 mm, the width of the grindstone blade is set to 0.6 mm (the thickness of the sandwiching portion is 0.1 mm each), and the tip of the base plate of the grindstone blade is set. The length of the sandwiching portion to be sandwiched was set to 3 mm, the distance from the tip of the base plate to the mesh member was set to 2 mm, and the length of the protruding portion was set to 2 mm. On the other hand, the grooves have a width of 2 mm, a length of 2 mm, and a depth of 0.1 mm, and are linear along the radial direction of the base plate. , Set to be formed at equal intervals. All of these grooves were made to reach the base layer on the base plate.
次に、台板を、治具、網状部材及び砥粒と共に、NiCl2・6H2Oを70g/L、NiSO4・6H2Oを370g/L、ホウ酸を45g/L、潤滑剤として株式会社JCU製#82を2g/L、光沢剤として、株式会社JCU製#83Sを20g/L及び株式会社JCU製#81Sを0.5g/L含む電気ニッケルめっき液に、台板の両平面を水平に配置して浸漬し、台板上の導電性の下地層をカソード、チタンケース電極をアノードとし、浴温度を55℃とし、0.7V以下の定電圧で、電気ニッケルめっきを合計420分間実施した。めっき中、めっき部分から水素ガスが発生した。また、めっき工程中、1~3AM/dm2のニッケル析出電気量毎に、通電を一旦停止し、台板の天地を反転させて、再び通電する操作を32回実施した。 Next, the base plate, along with the jig, mesh member and abrasive grains, NiCl 2.6H 2 O 70 g / L, NiSO 4.6H 2 O 370 g / L, boric acid 45 g / L, and stock as a lubricant. Both flat surfaces of the base plate are placed in an electric nickel plating solution containing 2 g / L of # 82 manufactured by JCU Co., Ltd., 20 g / L of # 83S manufactured by JCU Co., Ltd. and 0.5 g / L of # 81S manufactured by JCU Co., Ltd. as a brightener. Place it horizontally and immerse it, use the conductive base layer on the base plate as the cathode, the titanium case electrode as the anode, set the bath temperature to 55 ° C, and apply nickel plating for a total of 420 minutes at a constant voltage of 0.7 V or less. Carried out. During plating, hydrogen gas was generated from the plated part. Further, during the plating process, the operation of temporarily stopping the energization, reversing the top and bottom of the base plate, and energizing again was performed 32 times for each nickel precipitation electric amount of 1 to 3 AM / dm 2 .
次に、砥粒が台板に固定されたことを確認して治具及び網状部材を取り外し、キャビティ内が、砥粒とめっき金属で完全に充填された状態であったことを確認した後、治具を鍔部のないものに取り換えて、同じめっき条件で、後処理として、電気ニッケルめっきを120分間実施し、外周切断刃を得た。得られた外周切断刃の砥石刃部の外観写真を図4(A)に示す。 Next, after confirming that the abrasive grains were fixed to the base plate, the jig and the mesh member were removed, and it was confirmed that the inside of the cavity was completely filled with the abrasive grains and the plated metal. The jig was replaced with one without a flange, and nickel plating was performed for 120 minutes as a post-treatment under the same plating conditions to obtain an outer peripheral cutting blade. FIG. 4A shows an external photograph of the grindstone blade portion of the obtained outer peripheral cutting blade.
[比較例1]
台板として、超硬合金K10で形成された、外径131mm、内径60mm、厚み0.4mmの円形リング状薄板を用いた。この台板の外周部には、事前に、NiCl2・6H2Oを70g/L、NiSO4・6H2Oを370g/L、ホウ酸を45g/L、潤滑剤として株式会社JCU製#82を2g/L含む電気ニッケルめっき液を用い、浴温度を55℃として電気ニッケルめっきを施して、下地層としてニッケル皮膜を形成しておいた。
[Comparative Example 1]
As the base plate, a circular ring-shaped thin plate having an outer diameter of 131 mm, an inner diameter of 60 mm, and a thickness of 0.4 mm, which was made of cemented carbide K10, was used. On the outer periphery of this base plate, NiCl 2.6H 2 O is 70 g / L, NiSO 4.6H 2 O is 370 g / L, boric acid is 45 g / L, and JCU Co., Ltd. # 82 is used as a lubricant. A nickel plating solution containing 2 g / L of the above was used, and nickel plating was performed at a bath temperature of 55 ° C. to form a nickel film as an underlayer.
次に、下地層を形成した台板に対して、図3に示される治具及び網状部材の代わりに、図7に示される治具及び網状部材を用いて、台板の外周部にそって、外周部を取り囲むキャビティを形成し、閉止栓を外して、供給口からキャビティ内に、ダイヤモンド砥粒(ASTM #230/270)を、後述するめっき液に分散させたスラリーとして充填し、閉止栓を閉めて封入した。この場合、鍔部間の距離を0.6mmとして、砥石刃部の幅を0.6mm(挟持部の厚みは、各々0.1mm)に設定し、また、砥石刃部の台板先端部を挟持する挟持部の長さを、各々3mmに設定し、台板の先端から網状部材までの距離を2mmとして、突出部の長さを2mmに設定した。なお、この治具には、溝を形成するための突起部が形成されていない。また、図7中の各部には、図3と同じ参照符号を付して、それらの説明を省略する。 Next, for the base plate on which the base layer is formed, instead of the jig and the mesh member shown in FIG. 3, the jig and the mesh member shown in FIG. 7 are used along the outer peripheral portion of the base plate. , A cavity surrounding the outer peripheral portion is formed, the closing plug is removed, and diamond abrasive grains (ASTM # 230/270) are filled into the cavity from the supply port as a slurry dispersed in a plating solution described later, and the closing plug is used. Was closed and enclosed. In this case, the distance between the flanges is set to 0.6 mm, the width of the grindstone blade is set to 0.6 mm (the thickness of the sandwiching portion is 0.1 mm each), and the tip of the base plate of the grindstone blade is set. The length of the sandwiching portion to be sandwiched was set to 3 mm, the distance from the tip of the base plate to the mesh member was set to 2 mm, and the length of the protruding portion was set to 2 mm. It should be noted that this jig is not formed with a protrusion for forming a groove. Further, each part in FIG. 7 is designated by the same reference numeral as in FIG. 3, and the description thereof will be omitted.
次に、台板を、治具、網状部材及び砥粒と共に、NiCl2・6H2Oを70g/L、NiSO4・6H2Oを370g/L、ホウ酸を45g/L、潤滑剤として株式会社JCU製#82を2g/L、光沢剤として、株式会社JCU製#83Sを20g/L及び株式会社JCU製#81Sを0.5g/L含む電気ニッケルめっき液に、台板の両平面を水平に配置して浸漬し、台板上の導電性の下地層をカソード、チタンケース電極をアノードとし、浴温度を55℃とし、0.7V以下の定電圧で、電気ニッケルめっきを合計480分間実施した。めっき中、めっき部分から水素ガスが発生した。また、めっき工程中、1~3AM/dm2のニッケル析出電気量毎に、通電を一旦停止し、台板の天地を反転させて、再び通電する操作を32回実施した。 Next, the base plate, along with the jig, mesh member and abrasive grains, NiCl 2.6H 2 O 70 g / L, NiSO 4.6H 2 O 370 g / L, boric acid 45 g / L, and stock as a lubricant. Both flat surfaces of the base plate are placed in an electric nickel plating solution containing 2 g / L of # 82 manufactured by JCU Co., Ltd., 20 g / L of # 83S manufactured by JCU Co., Ltd. and 0.5 g / L of # 81S manufactured by JCU Co., Ltd. as a brightener. Place it horizontally and immerse it, use the conductive base layer on the base plate as the cathode, the titanium case electrode as the anode, set the bath temperature to 55 ° C, and apply nickel plating for a total of 480 minutes at a constant voltage of 0.7 V or less. Carried out. During plating, hydrogen gas was generated from the plated part. Further, during the plating process, the operation of temporarily stopping the energization, reversing the top and bottom of the base plate, and energizing again was performed 32 times for each nickel precipitation electric amount of 1 to 3 AM / dm 2 .
次に、砥粒が台板に固定されたことを確認して治具及び網状部材を取り外し、キャビティ内が、砥粒とめっき金属で完全に充填された状態であったことを確認した後、治具を鍔部のないものに取り換えて、同じめっき条件で、後処理として、電気ニッケルめっきを120分間実施し、外周切断刃を得た。得られた外周切断刃の砥石刃部の外観写真を図4(B)に示す。この砥石刃部は、その幅方向両端側の面が、台板の両平面と並行な平面形状となっている。 Next, after confirming that the abrasive grains were fixed to the base plate, the jig and the mesh member were removed, and it was confirmed that the inside of the cavity was completely filled with the abrasive grains and the plated metal. The jig was replaced with one without a flange, and nickel plating was performed for 120 minutes as a post-treatment under the same plating conditions to obtain an outer peripheral cutting blade. FIG. 4B shows an external photograph of the grindstone blade portion of the obtained outer peripheral cutting blade. The surfaces of the grindstone blade portion on both ends in the width direction have a planar shape parallel to both planes of the base plate.
実施例1及び比較例1で得られた外周切断刃を用い、長さ(外周切断刃の切断長さ方向)が40mm、高さ(外周切断刃の切断深さ方向)が16mmのR-Fe-B系希土類焼結磁石を、外周切断刃の回転速度を7,040rpm、外周切断刃が一度に切断する深さを1mmとし、外周切断刃の送り速度(長さ方向の移動速度)を100mm/minから700mm/minで設定して、厚みが2mmの磁石片を、各々の条件で6枚ずつ切り出し、切断時のスピンドル軸用モーターの平均負荷電流を測定した。結果を図5に示す。また、切断された磁石片について、その厚みを切断片の角4点と中央1点の厚みを測定して、それらの平均値を求め、切断片毎のばらつきから切断精度を評価した。結果を図6に示す。 Using the outer peripheral cutting blades obtained in Example 1 and Comparative Example 1, R-Fe having a length (in the cutting length direction of the outer peripheral cutting blade) of 40 mm and a height (in the cutting depth direction of the outer peripheral cutting blade) of 16 mm. -For B-based rare earth sintered magnets, the rotation speed of the outer peripheral cutting blade is 7,040 rpm, the depth at which the outer peripheral cutting blade cuts at one time is 1 mm, and the feed rate (moving speed in the length direction) of the outer peripheral cutting blade is 100 mm. Six pieces of magnet pieces having a thickness of 2 mm were cut out from / min to 700 mm / min under each condition, and the average load current of the spindle shaft motor at the time of cutting was measured. The results are shown in FIG. Further, the thickness of the cut magnet piece was measured by measuring the thickness at four corners of the cut piece and one point at the center, the average value was obtained, and the cutting accuracy was evaluated from the variation of each cut piece. The results are shown in FIG.
1 台板
1a 内穴
2 砥石刃部
21 溝
10 外周切断刃
51 治具
51a 鍔部
51b 供給口
51c 閉止栓
511 突起部
52 網状部材
52a ホルダー
a 回転軸
c キャビティ
1
Claims (8)
上記台板の外周部以外の上記砥石刃部を形成しない部分を被覆するように、上記台板の両平面を治具で挟持し、上記治具と、気体及び液体の通過は許容するが、上記砥粒の通過を許容しない目開きで形成された網状部材とで、上記台板の外周部に沿って該外周部を取り囲むキャビティを形成する工程、
該キャビティ内に上記砥粒を充填して上記キャビティ内に上記砥粒を封入する工程、
上記台板を、上記治具及び網状部材と共に、めっき液に浸漬する工程、及び
上記台板をカソードとして電気めっきし、めっき金属を析出させて、上記砥粒を上記めっき金属と共に上記台板の外周部上に結合させる工程を含み、
上記治具が、上記台板の外周部から離間した上記キャビティの内面の一部を構成する鍔部を有し、該鍔部に上記溝を形成するための突起部が形成されていることを特徴とする外周切断刃の製造方法。 A grindstone blade portion containing abrasive grains and a binder which is an electroplated metal is formed on the outer peripheral portion of the base plate of the circular ring-shaped thin plate, and the surfaces of the grindstone blade portion on both ends in the width direction of the base plate. It has a planar shape parallel to both planes, and grooves are formed on both ends of the grindstone blade portion in the width direction from the inner peripheral side to the outer peripheral side of the grindstone blade portion, and the grooves hold the grinding fluid. A method for manufacturing an outer peripheral cutting blade, which is a groove for reducing the contact area between the grindstone blade and the object to be cut .
Both planes of the base plate are sandwiched between jigs so as to cover the portion other than the outer peripheral portion of the base plate that does not form the grindstone blade portion, and the jig and the gas and liquid are allowed to pass through. A step of forming a cavity surrounding the outer peripheral portion along the outer peripheral portion of the base plate with a mesh member formed of a mesh that does not allow the passage of the abrasive grains.
A step of filling the cavity with the abrasive grains and enclosing the abrasive grains in the cavity.
The step of immersing the base plate together with the jig and the mesh member in the plating solution, and electroplating the base plate as a cathode to precipitate the plating metal, and the abrasive grains together with the plating metal of the base plate. Including the step of bonding on the outer peripheral part
The jig has a flange portion that forms a part of the inner surface of the cavity separated from the outer peripheral portion of the base plate, and the flange portion is formed with a protrusion for forming the groove. A characteristic method for manufacturing an outer peripheral cutting blade.
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2017
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2018
- 2018-06-04 EP EP20160891.6A patent/EP3680065B1/en active Active
- 2018-06-04 EP EP18175786.5A patent/EP3412409B1/en active Active
- 2018-06-05 US US15/997,941 patent/US20180354099A1/en not_active Abandoned
- 2018-06-08 CN CN201810585407.3A patent/CN109015430B/en active Active
- 2018-06-08 PH PH12018000160A patent/PH12018000160A1/en unknown
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Also Published As
Publication number | Publication date |
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EP3412409B1 (en) | 2021-01-06 |
JP2018202591A (en) | 2018-12-27 |
CN109015430A (en) | 2018-12-18 |
JP2022113768A (en) | 2022-08-04 |
EP3412409A1 (en) | 2018-12-12 |
EP3680065A1 (en) | 2020-07-15 |
PH12018000160A1 (en) | 2019-02-11 |
EP3680065B1 (en) | 2023-12-27 |
CN109015430B (en) | 2022-04-05 |
US20180354099A1 (en) | 2018-12-13 |
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