JPS6215079A - Manufacture of cutting grindstone - Google Patents

Abstract

PURPOSE:To reduce the warpage of the captioned grindstone and to improve the adhesion between a grindstone layer and a base member by performing both processes of an etching and a catalyst absorption as the preparation of a plating, and thereafter performing an activating process, eutectoid plating process and a baking process. CONSTITUTION:A ceramic base member 1 is dipped into stannous fluoride solution for generating porous etching flaws and simultaneously absorbing stannous ion thereof. Next, the primary activation of the base member 1 is performed by silver nitride solution while the secondary activation is performed by palladium chloride solution. Thereafter, the eutectoid plating of metal 4 and abrasive grains 3 is performed in the plating solution in which the abrasive grains are diffused so as to form a grindstone layer. Further, this grindstone is heated for performing a baking process so as to remove water content between crystals and increase crystallization and thereby it is possible to improve the adhesion between the grindstone layer 5 and the base member 1 and reduce the warpage of the grindstone.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a cutting wheel by plating, which is used to cut hard and brittle materials such as ferrite and ceramics.

Conventional technology A cutting wheel in which abrasive grains and metal are eutectoided by plating on the surface of a conventional metal base is known, but in terms of thinning the blade of the wheel, due to the influence of stress during grinding, The grindstone is easily distorted, and as shown in Japanese Patent Application Laid-open No. 110561/1983,
We proposed a method for manufacturing a grindstone with the structure shown in Figure 3.

The method for manufacturing this grindstone is to pre-treat the surface of a ceramic base material 1 made of alumina or the like by cleaning and activating it, and then plate it with a base plating 2 such as electroless nickel or copper, and then coat it with abrasive grains 3 and plated metal 4. The grinding wheel layer 5 is formed by eutectoiding, and the distortion of the grinding wheel is small and rotational runout is also reduced.

Problems to be Solved by the Invention However, although this manufacturing method for the grindstone structure allows for thinner blades with less distortion and less rotational runout, the grindstone deteriorates due to wear or is affected by frictional heat. There was a problem in that a portion of the base plating 2 easily fell off (peeled off) from the base material 1. In other words, the adhesion strength between the base material 1 and the base plating 2 is weak, and the dropped grinding wheel layer 6 enters the cutting groove, which has a negative effect on the grinding wheel, shortens the life of the grinding wheel, and causes greater damage to the workpiece. This had the problem of deteriorating machining accuracy.

Therefore, the present invention provides a method for manufacturing a cutting whetstone using a plating method, which improves the adhesion strength between the base material 1 and the whetstone layer 5, and allows processing with less processing damage.

A means to solve the problems and a method of manufacturing a cutting wheel of the present invention that solves the above problems is to use a ceramic disc as a composite material, and eutectoid abrasive grains of diamond cubic boron nitride and silicon carbide with plated metal. As shown in Table 1 in comparison with the conventional method, pretreatment etching and imparting catalytic properties are carried out in a single step. That is, by immersing the composite material in an aqueous solution of stannous fluoride, porous etching marks are created, and
It also adsorbs tin at the same time.

Furthermore, after the abrasive grains and the plated metal are eutectoid, the grindstone is heated and a baking process is added.

(Note) Wash with water before and after each process before baking.
Perform pickling, etc.

Function: In the present invention, etching with the above-described stannous fluoride and imparting catalytic properties can be performed in a single step, and the surface of the composite material becomes porous and the surface area increases. This makes it easier for the catalytic metal to be adsorbed, which improves the coverage of the plating metal in the subsequent process, improving adhesion. In addition, the adhesion strength is improved by removing water between the crystals and increasing the degree of crystallinity by baking treatment by heating.

As a result, the grinding wheel layer does not fall off during cutting, which improves the life of the grinding wheel, reduces cracks and chipping of the workpiece, and improves processing accuracy. In addition, post-processing such as grinding can be shortened or eliminated, resulting in a reduction in processing costs.

EXAMPLE An example of the present invention will be described below based on Table 1 above. The shape of the grindstone was the same as that of the conventional example shown in FIG.

First, the base material 1 was made from a material mainly composed of alumina using a general ceramic sintering method. The thickness of the composite material is 0.06~0.
2711 range.

Next, resist ink for plating is applied to the inner diameter side of this base material 1, and baking is performed.After degreasing the surface of the base material 1 with a solvent, the following catalytic imparting treatment, activation treatment base plating, eutectoid plating, and baking are performed. Processing etc. were carried out. In addition, water washing, pickling, etc. were performed before each step before baking.

(1) Adding catalytic properties (also used for etching) (2) Primary activation process (3) Secondary activation process (4) Base plating Nickel sulfate, sodium hypophosphite.

90% in an electroless nickel solution consisting of sodium citrate.
(6) Eutectoid plating of nickel sulfur amino acids and nickel chloride.

Electrolytic nickel plating solution consisting of boric acid, diamond abrasive grains, etc. at a temperature of 40 to 5°C and a current density of 1 to 3 A/dr.
r? , for 30 to 60 minutes (6) Baking treatment The grindstone after eutectoid plating is sandwiched between two spacers, placed in a dryer, and heated.As described above, the grindstone according to this example is As a treatment, etching with stannous fluoride and imparting catalytic properties are performed in a single process, and as shown in Figure 1, the adhesion strength is improved by about 1.7 times compared to the conventional method, and it is further improved by baking treatment. However, it is three times as effective as the conventional method, and the plating does not peel off during cutting, making it possible to reduce machining damage.

Furthermore, as shown in Figure 2, the relationship between baking treatment and adhesion strength is approximately 260%, although the adhesion strength increases as the temperature rises.
It reaches its highest point between .degree. C. and 300.degree. C., and does not change much above that temperature, and exhibits the highest adhesion strength when the baking time is maintained for 60 minutes. Therefore, in the example, the time was set to 300'060 minutes.

Further, it is also possible to use cubic boron nitride, silicon carbide, or the like as abrasive grains other than those in the embodiments, and to use a manufacturing method that does not include baking.

Effects of the invention As described above, the present invention uses a ceramic disc as a composite material,
After the base plating, the abrasive grains are eutectoided with the plating metal. As a pretreatment method for plating, etching and catalysis are performed using an aqueous solution of stannous fluoride, followed by activation, and then after the eutectoid plating. By performing baking treatment, it is possible to manufacture a whetstone with less warpage and a thin blade, and the adhesion between the whetstone layer and the base material is also good, and the life of the whetstone can be improved.

In addition, by reducing cracks and chipping on the workpiece, it is possible to shorten post-processing and reduce processing costs such as deletion. −

[Brief explanation of the drawing]

Fig. 1 is a comparison diagram of the adhesion strength between the grinding wheel layer and the composite material in the embodiment of the present invention with a conventional example, Fig. 2 is a correlation diagram between baking treatment temperature and adhesion strength, and Fig. 3 is an example of the embodiment of the present invention. 1 and 2 are structural diagrams of a conventional grindstone, in which a is a plan view and b is a cross-sectional view. 1...Base material (base metal), 2...Base plating, 3...Abrasive grains, 4...Plated metal,
5... Grindstone layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] The surface of the ceramic base material is cleaned and activated, and the abrasive grains and nickel or copper metal are simultaneously eutectoided in a plating solution in which abrasive grains of diamond, cubic boron nitride, and silicon carbide are dispersed. In the method for manufacturing a cutting wheel, the cleaning and activation are performed in one step by etching using an aqueous solution of stannous fluoride and imparting catalytic properties, and then primary activation is performed using an aqueous solution of silver nitrate, and A method for producing a cutting whetstone, which comprises performing secondary activation with a palladium-hydrochloric acid aqueous solution, eutectoidizing the abrasive grains and plated metal, and then heating and baking the whetstone.