JP2504418B2 - Grinding stone manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a grindstone used for manufacturing an electrodeposition grindstone, an electroformed grindstone, a diamond tool and the like.

"Prior Art" Conventionally, for example, the production of an electrodeposition grindstone is performed as follows.

First, a predetermined amount of superabrasive grains such as diamond and CBN is added to the plating liquid in the plating tank, and the superabrasive grains are uniformly dispersed by stirring the plating liquid with a stirrer. Next, connect the whetstone base metal (the object to be plated) immersed in the plating solution to the cathode of the power supply, and energize between it and the anode plate, while precipitating the metal plating phase on the whetstone base metal. An abrasive grain layer is formed by incorporating superabrasive grains therein.

Then, when the abrasive grain layer has a predetermined thickness, the power supply is stopped, the grindstone base metal is taken out, shaped and dressed to obtain an electrodeposition grindstone.

"Problems to be solved by the invention" By the way, by the method for producing a grindstone as described above, when an electrodeposited grindstone having a complicated shape is manufactured instead of a general disk shape, the abrasive grain layer of the grindstone base metal Of the parts to be formed,
Superabrasive grains are less likely to adhere to the surface that is substantially vertical or the surface facing downward, and the superabrasive grains are less likely to be taken into the metal plating phase. On the other hand, on the surface facing upward, the superabrasive grains tend to adhere due to gravity, and many superabrasive grains are taken into the metal plating phase. Since the amount of the metal plating phase deposited is substantially the same on all surfaces, the dispersion density of the superabrasive grains in the abrasive grain layer decreases in the vertical portion and the downward facing portion of the base metal surface during grinding. As a result, the exposure density of the superabrasive grains is decreased, and this manufacturing method has a drawback that an electrodeposition grindstone having an uneven thickness of the abrasive grain layer and partial unevenness in sharpness is manufactured.

"Object of the present invention" The present invention has been made in view of the above circumstances, and a grindstone capable of forming an abrasive grain layer having a uniform density of superabrasive grains on the surface of the object to be plated facing in any direction. It aims at providing the manufacturing method of.

[Means for Resolving Problems] In order to achieve the above object, the method for producing a grindstone according to claim 1 of the present invention is such that the metal plating phase is deposited on the object to be plated while the metal plating phase is being deposited. In a method of manufacturing a grindstone in which superabrasive grains are dispersed, in performing plating, a coating of a ferromagnetic metal having a thickness of 1/20 to 1/2 of the average grain size of the superabrasive grains on the surface of the superabrasive grains. A layer is formed, the coating layer is magnetized, and at least a part of the object to be plated is made of a ferromagnetic material.

A method for manufacturing a grindstone according to claim 2, wherein in the method for manufacturing a grindstone according to claim 1, the magnetic force of the metal coating layer on the surface of the superabrasive grains, the dispersion density of the superabrasive grains in the plating solution, and the plating current. Is adjusted to adjust the ratio of pores in the abrasive grain layer to 5 to 60 vol%.

[Examples] Hereinafter, the method for manufacturing a grindstone of the present invention will be described with reference to an example in which it is applied to a method for manufacturing an electrodeposition grindstone.

First, an electroless plating method is used to form a metal coating layer having ferromagnetism on the surface of superabrasive grains. For that purpose, first, superabrasive grains such as diamond and CBN are soaked in a catalyst solution such as an aqueous solution of palladium salt to impart catalytic activity to the surface of the superabrasive grains. Next, this superabrasive grain powder is taken out and added to an electroless plating solution containing ions of a ferromagnetic (hard magnetic) metal such as Ni, Co and Fe. Then, a ferromagnetic metal is deposited on the surface of the superabrasive grains to form a metal coating layer having a thickness of 1/20 to 1/2 of the average grain size of the superabrasive grains. If the thickness of this metal coating layer is less than 1/20 of the grain size of the superabrasive grains, the residual magnetism after magnetization is weak, the magnetic attraction with the object to be plated is weak, and the superabrasive particles are deposited on the object to be plated. It becomes difficult to disperse it uniformly. Further, if the metal coating layer is thicker than 1/2 of the superabrasive grain size, the biting of the superabrasive grains into the material to be ground may be deteriorated.

Then, the metal-coated superabrasive grains are taken out, enclosed in a plastic container or the like, set in a magnetizing device, and exposed by being exposed to a magnetic field having a strength capable of imparting sufficient residual magnetism to the metal-coated layer. Magnetize.

On the other hand, after grinding the surface of the grinding wheel base metal made of a material having ferromagnetism such as Ni, Co, Fe, ferromagnetic stainless steel, etc. The base metal is placed in a plating solution in which ions such as Ni and Co are dissolved. Then, the magnetized superabrasive grains are added to this plating solution in a predetermined amount, and while being stirred by a stirrer such as an ultrasonic stirrer, the whetstone base metal is connected to the cathode of the power source, and the anode in the plating solution Energize in the meantime.

At this time, since the superabrasive grains dispersed in the plating solution form a magnetic field around the metal coating layer formed on the surface, the superabrasive grains collide with the whetstone base metal by stirring or When passing through the vicinity, a weak magnetic attraction force is generated between the superabrasive grains and the whetstone base metal. Therefore, the superabrasive grains are attracted to the surface of the whetstone base metal, and are adsorbed and retained on the surface until they are peeled off by stirring. On the other hand, even within this residence time, the metal plating phase is successively deposited on the surface of the grinding wheel base metal, so that the superabrasive grains are trapped in the metal plating phase and gradually buried. Further, since superabrasive particles are successively deposited on the superabrasive grains captured in the metal plating phase, and the metal plating phase is sequentially deposited on these superabrasive grains, these superabrasive grains and superabrasive grains are deposited. The voids between the grains remain partially unfilled, resulting in the formation of multiple pores within the metal plating phase.

The pores in the metal plating phase have the effect of enhancing the chip discharge performance as a chip pocket when using a grindstone, the magnetic force of the metal coating layer on the surface of the superabrasive grains, and the superabrasive grains in the plating solution. By adjusting the dispersion density, plating current, etc., the proportion of pores in the abrasive grain layer is 5 to 60.
It is desirable to set it as vol%. The proportion of the pores is 5 vol
If it is less than 60%, the effect of forming chip pockets becomes insufficient, while if it is more than 60% by volume, the metal-plating phase weakens the force for holding superabrasive grains.

After a while, when the abrasive grain layer has a predetermined thickness, the energization is stopped, the grindstone base metal is taken out, shaped and dressed to obtain an electrodeposition grindstone.

In the method for producing an electrodeposition grindstone having such a configuration, a magnetic attraction force is generated between the superabrasive grains and the grindstone base metal,
This force causes superabrasive grains to adhere to the surface of the whetstone base for plating, so that the superabrasive grains can be taken up evenly on the surface to be plated in any direction without being affected by gravity. . Therefore, according to the present method, it is possible to form an abrasive grain layer having a uniform dispersion density of superabrasive grains, a uniform thickness of the abrasive grain layer, and to manufacture an electrodeposition grindstone having no unevenness in sharpness. it can.

Further, in this method, it is possible to easily form a large number of pores having an action of discharging chips and holding cooling water in the abrasive grain layer, resulting in an excellent electrodeposition with good sharpness and high cooling efficiency. It is possible to manufacture abrasive grains.

In the above examples, the present invention is shown as an example applied to a method for producing an electrodeposition grindstone, but the present invention is not limited to this, an electroformed grindstone having a similar abrasive grain layer, a method for producing a diamond tool or the like. Can also be used as

Further, the method of forming the metal coating is not limited to the electroless plating method, and may be a thin film forming method such as a sputtering method.

Furthermore, although the metal coating layer of superabrasive grains was magnetized in the above-mentioned embodiment, the present invention is not limited to this, and the metal coating layer of the superabrasive grain surface is not magnetized but the whetstone base is magnetized. It is also possible to carry out a method of doing so (heating later to eliminate the magnetic force), a method of magnetizing both the metal coating layer and the whetstone base metal, and the like.

Furthermore, in the above-mentioned example, the method was such that only the metal-coated superabrasive grains were dispersed in the metal plating phase, but the present invention is not limited to this, and in addition to the superabrasive grains, lubrication of hexagonal boron nitride, etc. Particles, forming a metal coating on hard particles such as silicon carbide, magnetized to this metal coating, may be dispersed with the superabrasive grains, in that case, compared to the case of only metal-coated superabrasive grains, It is possible to reduce the grinding resistance and improve the grinding ratio. Further, in some cases, it is not necessary to magnetize all of the superabrasive grains.

"Experimental Example" Next, the effect of the present invention will be demonstrated with an experimental example.

(Experimental Example 1) Diamond superabrasive grain powder (average particle size 50 µm) was dipped in a palladium salt aqueous solution to impart catalytic activity to the surface of the superabrasive grains.

This superabrasive grain powder was dispersed in an electroless Ni plating solution (SB-55 manufactured by Nippon Kanigen Co., Ltd., liquid temperature 65 ° C.) to form a cobalt coating layer of about 5 μm on the surface of the superabrasive grains. Then, the cobalt-coated superabrasive powder was enclosed in a plastic bottle and exposed to a magnetic field of 10 kilo Oersted for magnetization.

Then, using the apparatus shown in FIG. 1, the magnetized superabrasive grains were electrodeposited on a whetstone base metal. In the figure, reference numeral 1 is a plating tank having a mortar-shaped lower portion, 2 is a pipe communicating from the upper side surface to the lower end portion of the plating tank 1, and 3 is a circulation pump disposed in the middle of the pipe 2. The plating liquid filled in the bath 1 is sucked from the upper portion of the plating bath 1 by the circulation pump 3 and returned from the lower end of the plating bath into the plating bath. As a result, the superabrasive grains in the plating solution are evenly stirred.

Further, in the plating tank 1, a grindstone shaft 4 which is rotated by a motor and connected to a cathode of a power source is horizontally provided.
A disk-shaped grindstone base metal 5 masked except for the portion to be plated is attached to the grindstone shaft 4. Then, on both sides of the whetstone base metal 5, Ni anode plates 6, 6 respectively connected to the anodes of the power sources are arranged.

Using such equipment, the outer diameter 10
While forming a Ni plating phase on the outer circumference of a scale base metal with a diameter of 0 mm and a thickness of 10 mm, disperse the superabrasive grains in this plating phase
A 500 μm abrasive grain layer was formed.

Ni plating solution Ni sulfamate 450g / Ni chloride 10g / Boric acid 30g / Pit inhibitor Small amount brightener Small amount pH 4.0 Diamond superabrasive grain addition amount 50g / Superabrasive grain average particle size 50μm Ni coating thickness on superabrasive grain 5μm Grindstone Rotation speed of base metal 5 rpm Cathode current density 3 A / dm ² Plating solution temperature 50 ° C. Next, the obtained electrodeposition grindstone was shaped and dressed to obtain an electrodeposition grindstone with an outer diameter of 100.8 mmφ.

FIG. 2 is an enlarged cross-sectional view of this electrodeposition grindstone, 5 is a grinding wheel base metal, 7 is a Ni plating phase, 8 is superabrasive grains, 9 is a metal coating formed on the superabrasive grains, and 10 is a plating phase It is the pores formed in the. In the case of this grindstone, the content of superabrasive grains was 20 vol% and the porosity was 40 vol%.

Next, 96% of the alumina material was ground using the grindstone of this experimental example and the same shaped electrodeposition grindstone (comparative example) created by the conventional manufacturing method. As a result, with the grinding stone of the experimental example,
It showed a grinding resistance of 2/3 that of the grindstone of Comparative Example, and showed good sharpness without clogging for a long period of time.

(Experimental Example 2) In the same manner as above, plating is performed by using a disk-shaped flat substrate (13Cr stainless steel) masked except the plated portion as a cathode, and a plating phase of a predetermined thickness is formed on the flat substrate. While forming, superabrasive grains were dispersed in this plating phase to form an abrasive grain layer. Next, this flat substrate was taken out, the abrasive grain layer was peeled off from the flat substrate, and lapping, shaping, and dressing were performed to obtain an electroformed thin blade grindstone.

In the electroformed thin blade grindstone thus obtained, the superabrasive grains and the pores were extremely uniformly dispersed, and showed excellent sharpness, as compared with the conventional electroformed thin blade grindstone.

"Effects of the Invention" According to the method for manufacturing a grindstone of the present invention, the following excellent effects can be obtained.

In the method for producing a grindstone of the present invention, since the coating layer of the ferromagnetic metal having a thickness of 1/20 to 1/2 of the average particle diameter of the superabrasive grains is formed on the surface of the superabrasive grains, the coating layer is It is possible to sufficiently increase the residual magnetic strength of the formed superabrasive grains, so that the superabrasive grains are evenly adhered to the surface to be plated to form a plating phase with a uniform dispersion density of the superabrasive grains in the metal plating phase. be able to. Further, there is an effect that the biting of the superabrasive grains into the material to be ground is not deteriorated.

Therefore, according to the present invention, it is possible to manufacture a grindstone in which the superabrasive grain density in the abrasive grain layer and the wall thickness of the abrasive grain layer are uniform and the sharpness is even.

By adjusting the magnetic force of the metal coating of the superabrasive grains, the dispersion density of the superabrasive grains in the plating solution, the plating current, etc., it is possible to easily form a porous plating layer having an arbitrary porosity. Therefore, for example, when the present invention is applied to the production of a grindstone, the pores enhance the dischargeability of the chips of the grindstone, the action of holding cooling water can be enhanced, the sharpness is good, and the cooling efficiency is high. It is possible to manufacture a whetstone.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a manufacturing apparatus used for manufacturing an electrodeposition grindstone of an experimental example of the present invention, and FIG. 2 is an enlarged sectional view of an electrodeposition grindstone manufactured by the apparatus. 5 …… Grinding stone base metal (plating object), 7 …… Metal plating phase,
8 ... Super abrasive grain, 9 ... Metal coating, 10 ... Porosity

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masakatsu Inaba 1925 Shimoishi Togami, Kitamoto City Inside Diamond Tool Mfg. Co., Ltd., Mitsubishi Metals Co., Ltd. (56)

Claims (2)

(57) [Claims] 1. A method for producing a grindstone in which a metal plating phase is deposited on an object to be plated while the superabrasive grains are dispersed in the metal plating phase, the method comprising: A coating layer of ferromagnetic metal having a thickness of 1/20 to 1/2 is formed, and the coating layer is magnetized, and at least a part of the object to be plated is made of a ferromagnetic material. Method for manufacturing whetstone. 2. When performing plating, pores are occupied in the abrasive grain layer by adjusting the magnetic force of the metal coating layer on the surface of the superabrasive grains, the dispersion density of the superabrasive grains in the plating solution, and the plating current. The method for manufacturing a grindstone according to claim 1, wherein the ratio is 5 to 60 VOL%.