JP2018202591A - External peripheral cutting blade and its manufacturing method - Google Patents

Abstract

SOLUTION: There is provided an external peripheral cutting blade in which a grinding wheel blade part including abrasive grains and coupling materials is formed at an external peripheral part of a circular ring-shaped thin-thickness pedestal plate, and a groove progressing toward an external peripheral side from an internal peripheral side of the grinding wheel blade part is formed.EFFECT: By using this external peripheral cutting blade, processing can be performed at high accuracy and at a low cutting load even if the cutting processing is performed at a high-feed speed, a processing yield can be improved, and a low cost of the processing can be achieved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an outer peripheral cutting blade suitable for cutting rare earth sintered magnets and a method for manufacturing the same.

  As a cutting process of a rare earth sintered magnet, a cutting method using an outer peripheral cutting blade is known. This method is a method of cutting by attaching an outer peripheral cutting blade to a general cutting machine, and is characterized by good dimensional accuracy and high processing speed. As a processing method excellent in mass productivity, rare earth sintered magnet Widely used for cutting.

  As an outer peripheral blade for cutting rare earth permanent magnets, diamond abrasive grains or cBN abrasive grains are fixed to the outer peripheral portion of the cemented carbide base plate 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 work cutting is improved. To do. In addition, by using a cemented carbide base plate to make the blade thin, the yield can be improved and the processing speed can be increased.

  A so-called cemented carbide obtained by sintering WC with Ni, Co or the like is a highly rigid material having a Young's modulus of 450 to 700 GPa, and is much stronger than a steel alloy material of about 200 GPa. High Young's modulus means that the amount of deformation of the blade is less than the cutting resistance applied to the cutting blade. With the same cutting resistance, the bending of the blade is small, and the bending of the blade is the same. Then, even if the blade is thin, it can be cut with the same processing accuracy. When a cutting blade using a cemented carbide base plate is used, the cutting resistance on the unit area of the blade does not change much, but since the cutting resistance applied to the entire cutting blade is reduced by the thinning of the blade, how many In the multi-cutting process in which a number of magnets are cut at the same time by stacking the blades, the total cutting resistance applied to the entire cutting machine is reduced. This makes it possible to increase the number of multi-cutting blades even with the same output motor, reducing cutting resistance even with the same number of blades, improving the dimensional accuracy of cutting, and saving motor power. You can also. If there is a margin of motor power for the cutting resistance, it is possible to shorten the cutting time by speeding up the progress of the grindstone.

  As described above, the productivity of the peripheral cutting process has been greatly improved by adopting the high-rigidity cemented carbide base plate. However, the market demand for rare earth sintered magnets has increased further, and the higher the processing speed, the higher the productivity. Therefore, cutting at higher speed than the cutting blades using the current cemented carbide base plate Therefore, it is desired to develop an outer peripheral cutting blade capable of cutting with high accuracy.

JP-A-9-174441 JP-A-10-175171 JP-A-10-175172 JP 2009-172751 A JP 2013-13966 A Japanese Patent Publication No. 52-15834 International Publication No. 00/30810

  When a rare earth sintered magnet or the like is cut using an outer peripheral cutting blade, a grinding fluid (coolant) is used during processing. The outer peripheral cutting blade is required to have a high dimensional accuracy with respect to the workpiece. In order to improve the dimensional accuracy, the outer peripheral cutting blade efficiently supplies the grinding fluid to the grinding part (cutting part) to provide the grinding part. It is effective that it can be cooled, grinding waste generated in the grinding part can be efficiently discharged, chipping can be reduced, and the like.

  The present invention has been made in view of the above circumstances, and provides an outer peripheral cutting blade capable of high-speed cutting, high cutting accuracy, improved processing yield and lower processing cost, and a method for manufacturing the same. The purpose is to do.

  As a result of earnest study to achieve the above object, the present inventor, as an outer peripheral cutting blade in which a grindstone blade portion including 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 part are formed at both ends in the width direction of the grindstone blade part enables high-speed cutting, high cutting accuracy, and improved processing yield And it was found that it is a peripheral cutting blade that can realize low cost of processing.

  Then, such a peripheral cutting blade sandwiches both planes of the base plate with a jig so as to cover a portion not forming the grindstone blade part other than the outer peripheral portion of the base plate, and the jig, gas, and liquid A cavity that surrounds the outer periphery of the base plate is formed along the outer periphery of the base plate with the mesh member that is allowed to pass but not allowed to pass abrasive grains, and is filled with abrasive grains. Abrasive grains are enclosed in the cavity, the base plate is immersed in a plating solution together with a jig and a net-like member, electroplated using the base plate as a cathode, plating metal is deposited, and the abrasive grains are put together with the plating metal to the base plate. In this case, as a jig, there is a flange part that forms a part of the inner surface of the cavity that is separated from the outer periphery part of the base plate, and a protrusion for forming a groove in the flange part Can be manufactured satisfactorily by using a jig formed with Heading, the present invention has been accomplished.

That is, this invention provides the following outer periphery cutting blade and its manufacturing method.
Claim 1:
An outer peripheral cutting blade in which a grindstone blade portion including 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, wherein grooves are formed at both ends in the width direction of the grindstone blade portion from the inner peripheral side to the outer peripheral side of the grindstone blade portion.
Claim 2:
Both the inner peripheral surface side and the outer peripheral surface side of the grindstone blade part of the groove penetrate, or the inner peripheral surface side of the grindstone blade part of the groove penetrates and the outer peripheral surface side is closed. The outer peripheral cutting blade according to claim 1.
Claim 3:
The outer peripheral cutting blade according to claim 1 or 2, wherein the groove is formed along the radial direction of the base plate or inclined at an angle of 60 ° or less with respect to the radial direction.
Claim 4:
The outer peripheral cutting blade according to any one of claims 1 to 3, wherein the groove reaches the base plate or a base layer formed on a surface of the base plate.
Claim 5:
The outer periphery cutting blade according to any one of claims 1 to 4, wherein the binder is an electroplated metal.
Claim 6:
A method for producing the outer peripheral cutting blade according to claim 5,
The two surfaces of the base plate are clamped with a jig so as to cover the portion that does not form the grindstone blade part other than the outer peripheral portion of the base plate, and the jig and the passage of gas and liquid are allowed, 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 with an opening that does not allow passage of the abrasive grains;
Filling the abrasive grains in the cavity and enclosing the abrasive grains in the cavity;
The step of immersing the base plate in a plating solution together with the jig and the net-like member, and electroplating using the base plate as a cathode, depositing a plating metal, and the abrasive grains together with the plating metal on the base plate Including bonding on the outer periphery,
The jig has a flange portion that constitutes a part of the inner surface of the cavity that is separated from the outer peripheral portion of the base plate, and a protrusion for forming the groove is formed in the flange portion. A method for manufacturing a peripheral cutting blade.

  By using the outer peripheral cutting blade provided in the present invention, even if cutting is performed at a high feed rate, it can be processed with high accuracy and with a low cutting load, and the processing yield can be improved and the processing cost can be reduced. .

It is a figure which shows an example of the outer periphery cutting blade of this invention, (A) is a side view, (B) is a longitudinal cross-sectional view in the surface along the rotating shaft of an outer periphery cutting blade. (A)-(C) are side views which respectively show the example of the outer periphery cutting blade of this invention. It is a figure of the jig | tool suitable for manufacture of the outer periphery cutting blade of this invention, and a mesh member, (A) is a decomposition | disassembly side view, (B) is sectional drawing. (A) is an appearance photograph of the grindstone blade part of the outer periphery cutting blade obtained in Example 1, and (B) is an appearance photograph of the grindstone blade part of the outer periphery cutting blade obtained in Comparative Example 1. It is the graph which plotted the average load current of the motor for spindle shafts when the rare earth sintered magnet was cut using the outer periphery cutting blade of Example 1 and Comparative Example 1 against the feed rate of the outer periphery cutting blade. It is the graph which plotted the average thickness of the magnet piece cut | disconnected when cut | disconnecting a rare earth sintered magnet using the outer periphery cutting blade of Example 1 and Comparative Example 1 with respect to the feed rate of the outer periphery cutting blade. It is a figure of the jig | tool and net-like member which were used in the comparative example 1, (A) is an exploded side view, (B) is sectional drawing.

Hereinafter, the present invention will be described in more detail.
In the outer peripheral cutting blade of the present invention, a grindstone blade portion including abrasive grains and a binder is formed on the outer peripheral portion of the base plate of the circular ring-shaped thin plate. Specifically, for example, the one shown in FIG. 1A and 1B are views showing an example of an outer peripheral cutting blade of the present invention, in which FIG. 1A is a side view, and FIG. 1B is a longitudinal sectional view of a surface along the rotation axis of the outer peripheral cutting blade. In this outer peripheral cutting blade 10, a grindstone blade portion (cutting blade portion) 2 in which abrasive grains are bonded by a binder is formed on the outer peripheral portion of a circular ring-shaped thin plate 1 having an inner hole 1a. In addition, in FIG. 1, a has shown the rotating shaft of the outer periphery cutting blade 10. FIG.

The base plate is preferably made of cemented carbide. Specifically, a carbide powder of a metal belonging to groups IVB, VB, VIB of the periodic table such as WC, TiC, MoC, NbC, TaC, Cr ₃ C _{2 is used} as Fe. , Co, Ni, Mo, Cu, Pb, Sn, or alloys that are sintered and bonded using these alloys are preferable, and among them, WC-Co, WC-Ti, C-Co, and WC-TiC are particularly preferable. It is particularly preferable to use a representative one of the -TaC-Co system. Moreover, in these cemented carbides, what has the electroconductivity of the grade which can be plated, or can provide electroconductivity with a palladium catalyst etc. is preferable. The base plate has an outer diameter of 80 mm or more, particularly 100 mm or more, 200 mm or less, particularly 180 mm or less, an inner diameter of 30 mm or more, particularly 40 mm or more, 80 mm or less, particularly 70 mm or less, and a thickness of 0.1 mm or more, particularly 0. .2 mm or more and 1.0 mm or less, particularly 0.8 mm or less are suitable.

  As abrasive grains constituting the grinding wheel blade portion, diamond (natural diamond, industrial synthetic diamond) abrasive grains, cBN (cubic boron nitride) abrasive grains, or mixed abrasive grains of diamond abrasive grains and cBN abrasive grains are used. Is preferred. Although the magnitude | size of an abrasive grain is based also on the thickness of the baseplate to couple | bond, it is preferable that it is 10-500 micrometers in an average particle diameter. If the average particle size is less than 10 μm, the gap between the abrasive grains is reduced, so that clogging is likely to occur during cutting, and the cutting ability may be reduced. If the average particle size exceeds 500 μm, the magnet is cut. There is a risk of problems such as rough surfaces.

  As the binder, any of a metal (an alloy is included in this metal) and a resin may be used, but from the viewpoint of easily forming a predetermined shape to be described later in the grindstone blade part of the outer peripheral cutting blade of the present invention. As the binder, it is preferable to apply a metal binder, in particular, a plated metal by electroplating or electroless plating. As the metal binder, one kind of metal selected from Ni, Fe, Co, Sn, Cu, or two or more alloys of these metals, or one or more kinds selected from these metals, and B, An alloy with one or more of nonmetals selected from P, C, and the like can be used.

  The abrasive volume ratio in the grindstone blade portion is preferably 10% by volume or more, particularly 15% by volume or more, and 80% by volume or less, particularly preferably 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. In either case, the resistance during cutting increases, and the cutting speed must be slowed down. There is a risk that it will not be obtained. In addition, although the grindstone blade portion is usually composed only of abrasive grains and a binder, for example, for the purpose of adjusting the hardness, stress, elasticity, etc. of the grindstone blade portion, a material other than the abrasive grains and the binder, For example, you may mix by the volume ratio of 10 volume% or less, especially 5 volume% or less.

  In the grindstone blade portion of the outer peripheral cutting blade of the present invention, grooves are formed at both ends in the width direction from the inner peripheral side of the grindstone blade portion toward the outer peripheral side. FIG. 2 is a side view showing an example of the outer peripheral cutting blade and the grindstone blade portion of the present invention. As shown in FIG. 2 (A), the grooves formed in the grindstone blade portion are the grindstone blade portion 2 formed on the outer peripheral portion of the base plate 1, and the inner peripheral surface side and the outer periphery of the grindstone blade portion 2. In the grindstone blade portion 2 formed on the outer peripheral portion of the base plate 1 as shown in FIG. 2 (B), the inner peripheral surface side of the grindstone blade portion penetrates through the groove 21 through which both of the surface sides penetrate. An example of the groove 21 is a closed outer peripheral surface. In addition to the groove formed along the radial direction of the base plate as shown in FIG. 2 (A) and FIG. 2 (B), as shown in FIG. 2 (C), A groove 21 inclined with respect to the radial direction of the base plate is also suitable. In this case, the inclination angle is preferably 60 ° or less, particularly 45 ° or less. Further, the groove may reach the base plate or the base layer formed on the surface of the base plate, or may not reach the base layer formed on the base plate or the surface of the base plate.

  The conventional grindstone blade part of the outer peripheral cutting blade has a planar shape parallel to both flat surfaces of the base plate at both ends in the width direction. In such a shape, both ends in the width direction of the grindstone blade part are used. The grinding liquid was not retained in the part. On the other hand, the grindstone blade part 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 part, so that the grinding liquid is held in the groove. In addition, since the contact area between the grindstone blade part and the workpiece is small and the cutting resistance between the two is reduced, high-speed cutting is possible, and the cutting accuracy during high-speed cutting has been Improved compared to The groove may have any shape, and need not be a specific shape. For example, the groove may have a square shape, a semicircular shape, or a semielliptical shape. The groove is preferred. The grooves may not be regularly arranged, but are usually formed at regular intervals. Furthermore, the ratio of the groove in the grindstone blade portion is 10 to 50% of the total area of the groove portion with respect to the entire area of the grindstone blade portion in the side view as viewed from both ends in the width direction of the grindstone blade portion. It is preferable that

  As shown in FIG. 2, the grindstone blade portion 2 is formed so as to sandwich the front end portion of the base plate 1 and protrude forward from the front end portion of the base plate 1, and the thickness of the grindstone blade portion 2 is the base plate. It is formed to be thicker than 1. It is preferable that the length of the pair of sandwiching portions that sandwich the tip portion of the base plate 1 of the grindstone blade portion 2 is 0.5 mm or more, particularly 1 mm or more, 4 mm or less, particularly 3 mm or less. The thickness of the pair of sandwiching portions is preferably 0.05 mm or more, particularly 0.1 mm or more, and 0.5 mm or less, particularly 0.25 mm or less.

  On the other hand, the length of the protruding part protruding forward from the base plate 1 of the grindstone blade part 2 depends on the size of the abrasive grains to be fixed, but is 0.05 mm or more, particularly 0.1 mm or more, 5 mm or less, In particular, it is preferably 2.5 mm or less.

  As a method of manufacturing a peripheral cutting blade by forming a grindstone blade part on the outer peripheral part of the base plate, resin is used as a binder, and abrasive grains and a resin are mixed on the outer peripheral part of the base plate to form the grindstone blade part. A resin bond method may be used, but a metal bond method in which a metal is used as a binder and a grindstone blade portion including abrasive grains and a metal is formed is preferable. The metal bond method may be a brazing method in which abrasive grains and metals 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 particularly preferred. The plating method includes an electroplating method (electrodeposition 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-described metal binder can be used, and the plating conditions may be normal plating conditions in the plating solution. . The anode may be either a soluble anode or an insoluble anode, but an insoluble anode is preferred. As the insoluble anode, a conventionally known anode used in electroplating such as a Pt electrode or a Ti electrode may be used.

  In addition, when forming a grindstone blade part by a metal bond method, you may form a base layer previously in the outer peripheral part of a base plate. This underlayer can be formed of the same material as exemplified for the metal binder, and may be formed by either a brazing method or a plating method. Moreover, in order to improve the bond strength at the time of fixing to the outer peripheral part of a base plate by a metal bond method, you may use an abrasive grain previously coated by sputtering, electroless plating, etc.

From the viewpoint of easily forming the predetermined shape of the outer peripheral cutting blade of the present invention, it is effective to produce the binder by electroplating metal by the following method. This manufacturing method includes
(1) The both surfaces of the base plate are clamped with a jig so as to cover the portion where the grindstone blade portion other than the outer peripheral portion of the base plate is not formed, and the passage of the jig and gas and liquid is allowed. A step of forming a cavity surrounding the outer peripheral portion along the outer peripheral portion of the base plate with a net-like member formed with an opening that does not allow passage of grains;
(2) a step of filling abrasive particles in the cavity and enclosing the abrasive particles in the cavity;
(3) A step of immersing the base plate in a plating solution together with a jig and a net-like member, and (4) electroplating using the base plate as a cathode, depositing a plating metal, and polishing particles together with the plating metal. A step of bonding on the outer periphery is included. Here, as a jig, use a jig having a flange part that forms a part of the inner surface of the cavity spaced from the outer peripheral part of the base plate, and a protrusion part for forming a groove in the flange part. Is effective.

  This method will be described in more detail with reference to the drawings. 3A and 3B are views of a jig and a net-like 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 sectional view in an assembled state in which a cavity is formed. . First, since the grindstone blade portion is formed on the outer peripheral portion of the base plate 1, as shown in FIG. 3 (A), jigs 51 and 51 that can cover portions other than the outer peripheral portion of the base plate, 51 and a net-like member 52 capable of forming a cavity surrounding the outer peripheral portion along the outer peripheral portion of the base plate 1, and as shown in FIG. Further, the cavity member c is formed by winding the mesh member 52 around the outer peripheral surfaces of the jigs 51 and 51 and fixing the mesh member 52. As the mesh member, a wire mesh (for example, made of SUS), a resin mesh, or the like can be used.

  In this case, the jig 51 has a flange portion 51a that is separated from the outer peripheral portion of the base plate 1 and constitutes a part of the inner surface of the cavity c, and a groove is formed in the grindstone blade portion in the flange portion 51a. A projection 511 is formed for this purpose. In addition, the flange 51a is provided with a supply port 51b for introducing abrasive grains into the cavity c. In FIG. 3, 51 c is a closing plug for the supply port 51 b, and the closing plug 51 c constitutes a part of the flange 51 a of the jig 51. Reference numeral 52 a denotes a holder for fixing the mesh member 52 on the outer peripheral surface of the jig 51.

  Next, the abrasive grains are filled in the cavity, and the abrasive grains are sealed in the cavity c. When using jigs 51 and 51 as shown in FIG. 3, it is only necessary to fill the abrasive grains from the supply port 51b. After removing the stopper plug 51c and filling the cavity c with a necessary amount of abrasive grains, What is necessary is just to reattach the stopper plug 51c to the supply port 51b. The filling of the abrasive grains can be performed by making the abrasive grains into a slurry dispersed in a plating solution or a liquid such as water. In that case, the excess liquid may be discharged through the mesh member 52.

  Next, the base plate 1 is immersed in the plating solution together with the jigs 51 and 51 and the mesh member 52. Thereby, the plating solution is filled in the cavity c through the mesh member 52.

  Next, electroplating is performed using the base plate 1 (a conductive layer previously formed on the surface of the base plate 1 when the base plate 1 is a non-conductive material) as a cathode. Then, the plating metal is deposited, and the abrasive grains are bonded to the outer peripheral portion of the base plate (cathode) 1 together with the plating metal. As electroplating proceeds, the plating solution is sequentially supplied into the cavity c through the mesh member 52. Thereby, the inside of the cavity c is gradually filled with the abrasive grains and the plated metal. Usually, the electroplating is completed when the cavity c is completely filled with the abrasive grains and the plating metal.

  In addition, it is preferable to arrange | position both planes of the baseplate 1 horizontally during an electroplating process. By doing in this way, the abrasive grains can be bonded by the plating metal in a state of being brought into contact with or close to one plane of the base plate 1 by its own weight, and the top and bottom of the base plate can be fixed in the middle of the electroplating process. If it is reversed, the abrasive grains can be bonded by the plated metal in a state where they are brought into contact with or close to the other plane of the base plate 1 by their own weight. The inversion of the top and bottom of the base plate is not limited to once, and may be repeated a plurality of times. Further, if the plated metal is deposited to some extent and the abrasive grains are fixed on the base plate, the cavity c may be opened thereafter. In this case, for example, the mesh member is removed and the jig is not provided with a hook. It may replace with a thing and may implement the electroplating process as a post-process.

In the case of cutting using the outer peripheral cutting blade of the present invention, as an object to be cut, an R-Co rare earth sintered magnet, an R-Fe-B 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 elements, the same shall apply hereinafter) are suitable. R-Co based rare earth sintered magnets include RCo ₅ and R ₂ Co ₁₇ systems. Among these, for example, in the R ₂ Co ₁₇ system, it is composed of 20 to 28 mass% R, 5 to 30 mass% Fe, 3 to 10 mass% Cu, 1 to 5 mass% Zr, and the balance Co. Is mentioned. On the other hand, as R—Fe—B rare earth sintered magnets, 5 to 40% by mass of R, 0.2 to 8% by mass of B, 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).

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Example 1]
A circular ring-shaped thin plate made of cemented carbide K10 and having an outer diameter of 131 mm, an inner diameter of 60 mm, and a thickness of 0.4 mm was used as the base plate. On the outer periphery of the 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 lubricant is JCU Corporation (former company name). : Electron plating solution containing 2 g / L of # 82 manufactured by EBARA Eugenelite Co., Ltd., and electronickel plating was performed at a bath temperature of 55 ° C. to form a nickel film as an underlayer.

  Next, a cavity surrounding the outer periphery of the base plate on which the base layer is formed is formed along the outer periphery of the base plate using the jig and the net-like member shown in FIG. 3, and the stopper 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 closure plug was closed and sealed. In this case, the distance between the flanges is set to 0.6 mm, the width of the grindstone blade portion 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 portion is The lengths of the clamping parts to be clamped were each 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 part was set to 2 mm. On the other hand, the groove is a straight line along the radial direction of the base plate having a width of 2 mm, a length of 2 mm, and a depth of 0.1 mm. , So as to be formed at equal intervals. All of these grooves reached the base layer on the base plate.

Next, the base plate, together with jigs, mesh members and abrasive grains, NiCl ₂ · 6H ₂ O 70 g / L, NiSO ₄ · 6H ₂ O 370 g / L, boric acid 45 g / L, stock as a lubricant Company JCU # 82 as 2g / L, Brightener, JCU Co., Ltd. # 83S 20g / L and JCU Co., Ltd. # 81S 0.5g / L Immerse horizontally and place the conductive underlayer on the base plate as the cathode, the titanium case electrode as the anode, the bath temperature at 55 ° C., and a constant voltage of 0.7V or less for a total of 420 minutes. Carried out. During the plating, hydrogen gas was generated from the plating part. Further, during the plating process, for every 1 to 3 AM / dm ² of nickel deposition electricity amount, the energization was temporarily stopped, the top and bottom of the base plate was reversed, and the operation of energizing was performed 32 times.

  Next, after confirming that the abrasive grains were fixed to the base plate, remove the jig and the net-like member, and after confirming that the inside of the cavity was completely filled with abrasive grains and plated metal, The jig was replaced with one having no flange, and electronickel plating was performed for 120 minutes as a post-treatment under the same plating conditions to obtain an outer peripheral cutting blade. The appearance photograph of the grindstone blade part of the obtained outer peripheral cutting blade is shown in FIG.

[Comparative Example 1]
A circular ring-shaped thin plate made of cemented carbide K10 and having an outer diameter of 131 mm, an inner diameter of 60 mm, and a thickness of 0.4 mm was used as the base plate. On the outer periphery of the 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 lubricant # 82 made by JCU Corporation as a lubricant. Was used, and the nickel film was formed as an undercoat layer by applying electronickel plating at a bath temperature of 55 ° C.

  Next, instead of the jig and mesh member shown in FIG. 3, the jig and mesh member shown in FIG. 7 are used along the outer periphery of the base plate on which the base layer is formed. The cavity surrounding the outer periphery is formed, the stopper plug is removed, the diamond abrasive grains (ASTM # 230/270) are filled into the cavity from the supply port into the cavity, and the stopper is filled Was closed and sealed. In this case, the distance between the flanges is set to 0.6 mm, the width of the grindstone blade portion 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 portion is The lengths of the clamping parts to be clamped were each 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 part was set to 2 mm. Note that the jig does not have a protrusion for forming a groove. Moreover, the same reference numerals as those in FIG. 3 are given to the respective parts in FIG. 7, and the description thereof is omitted.

Next, the base plate, together with jigs, mesh members and abrasive grains, NiCl ₂ · 6H ₂ O 70 g / L, NiSO ₄ · 6H ₂ O 370 g / L, boric acid 45 g / L, stock as a lubricant Company JCU # 82 as 2g / L, Brightener, JCU Co., Ltd. # 83S 20g / L and JCU Co., Ltd. # 81S 0.5g / L Immerse it horizontally, so that the conductive base layer on the base plate is the cathode, the titanium case electrode is the anode, the bath temperature is 55 ° C., and the electric nickel plating is performed at a constant voltage of 0.7 V or less for a total of 480 minutes. Carried out. During the plating, hydrogen gas was generated from the plating part. Further, during the plating process, for every 1 to 3 AM / dm ² of nickel deposition electricity amount, the energization was temporarily stopped, the top and bottom of the base plate was reversed, and the operation of energizing was performed 32 times.

  Next, after confirming that the abrasive grains were fixed to the base plate, remove the jig and the net-like member, and after confirming that the inside of the cavity was completely filled with abrasive grains and plated metal, The jig was replaced with one having no flange, and electronickel plating was performed for 120 minutes as a post-treatment under the same plating conditions to obtain an outer peripheral cutting blade. The appearance photograph of the grindstone blade part of the obtained outer peripheral cutting blade is shown in FIG. As for this grindstone blade part, the surface of the both ends of the width direction becomes a planar shape parallel to the both planes of a base plate.

  Using the peripheral cutting blades obtained in Example 1 and Comparative Example 1, R-Fe having a length (cutting length direction of the peripheral cutting blade) of 40 mm and a height (cutting depth direction of the peripheral cutting blade) of 16 mm -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 speed (moving speed in the length direction) of the outer peripheral cutting blade is 100 mm. 6 pieces of magnet pieces having a thickness of 2 mm were cut out under the respective conditions, and the average load current of the spindle shaft motor at the time of cutting was measured. The results are shown in FIG. Moreover, about the cut | disconnected magnet piece, the thickness of four corners and the center one point of a cut piece was measured, the average value was calculated | required, and the cutting precision was evaluated from the dispersion | variation for every cut piece. The results are shown in FIG.

1 Base plate 1a Inner hole 2 Grinding wheel blade portion 21 Groove 10 Outer peripheral cutting blade 51 Jig 51a Hook portion 51b Supply port 51c Closure plug 511 Projection portion 52 Net member 52a Holder a Rotating shaft c Cavity

Claims (6)

An outer peripheral cutting blade in which a grindstone blade portion including 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, wherein grooves are formed at both ends in the width direction of the grindstone blade portion from the inner peripheral side to the outer peripheral side of the grindstone blade portion.   Both the inner peripheral surface side and the outer peripheral surface side of the grindstone blade part of the groove penetrate, or the inner peripheral surface side of the grindstone blade part of the groove penetrates and the outer peripheral surface side is closed. The outer peripheral cutting blade according to claim 1.   The outer peripheral cutting blade 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.   The outer peripheral cutting blade according to any one of claims 1 to 3, wherein the groove reaches the base plate or a base layer formed on a surface of the base plate.   The outer periphery cutting blade according to any one of claims 1 to 4, wherein the binder is an electroplated metal. A method for producing the outer peripheral cutting blade according to claim 5,
The two surfaces of the base plate are clamped with a jig so as to cover the portion that does not form the grindstone blade part other than the outer peripheral portion of the base plate, and the jig and the passage of gas and liquid are allowed, 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 with an opening that does not allow passage of the abrasive grains;
Filling the abrasive grains in the cavity and enclosing the abrasive grains in the cavity;
The step of immersing the base plate in a plating solution together with the jig and the net-like member, and electroplating using the base plate as a cathode, depositing a plating metal, and the abrasive grains together with the plating metal on the base plate Including bonding on the outer periphery,
The jig has a flange portion that constitutes a part of the inner surface of the cavity that is separated from the outer peripheral portion of the base plate, and a protrusion for forming the groove is formed in the flange portion. A method for manufacturing a peripheral cutting blade.