JPH04124297A - Production of electrodeposition tool - Google Patents

Abstract

PURPOSE:To produce an electrodeposition tool without requiring the finishing of the grained surface by electrolysis while simply removing a frame mold and reusing it by forming a film of a low m.p. metal on the molding surface of the mold, melting the film by heating and arranging abrasive grains. CONSTITUTION:A film 3 of a low m.p. metal such as Pb or Sn is formed by plating on the molding surface 2 of a frame mold 1 and abrasive grains 4 of diamond, cubic BN, etc., are adhered to the surface 2. At this time, the film 3 is melted, the grains 4 are bitten in the molten film and this film is solidified by cooling to temporarily fix the grains 4. An Ni plating layer 5 is then formed on the grains 4 and the film 3 is allowed to flow out by heating to the m.p. to obtain an intermediate product with the grains 4 embedded in the outside of the thick Ni plating layer 5 by about 2/3 of the diameter. A core metal 6 is put in the product and a sintered alloy 7 having a relatively low m.p. is melted, poured and solidified by cooling to complete an electrodeposition tool 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the production of electrodeposited tools such as electroplated grindstones and rotary dressers and implied dressers using diamond or CBN (cubic boron nitride) abrasive grains. Regarding the method.

[Conventional technology]

Conventionally, as a method for manufacturing this type of electrodeposition tool, for example, a method for manufacturing a so-called reverse electrodeposition grindstone is known, in which abrasive grains are fixed by electrodeposition on the inner surface of a frame for forming the grindstone.

In other words, the forming surface of the metal or carbon frame mold that forms the abrasive surface shape of the electrodeposition tool (i.e., aligning the heads of the abrasive grains,
A thin layer of adhesive is applied in advance to the surface of the whetstone (the surface on which the abrasive surface is to be formed), and the abrasive grains are aligned and adhered to the molded surface in a layer of thickness, and then the bonded abrasive grains are held. In order to firmly fix the abrasive grains, nickel (Nt) plating is applied to the required thickness to mechanically fix the abrasive grains, and a molten sintered metal with a low melting point is poured in and solidified to form the base. Then remove the frame. If it is a metal frame, it is removed by cutting, and if it is a carbon frame, it is broken and removed. On the abrasive surface of the electrodeposition tool obtained in this way, a nickel layer is exposed filling the space between the abrasive grains, which are closely arranged with their heads aligned, so that the nickel layer is removed by electrolysis to approximately 3/10 of the abrasive grain diameter.
The finished product is then removed.

[Problem to be solved by the invention]

However, the above conventional method for manufacturing an electrodeposition tool has the following problems.

■ The molding surface of the frame is finished with high precision to match the shape of the surface to be machined with the electrodeposition tool, and therefore, despite being expensive, it can only be used once. Can not.

■ It takes time and effort to remove by cutting or breaking the frame. Furthermore, after the frame is removed, it takes a long time to remove a predetermined thickness of the electrodeposited layer filling the spaces between the abrasive grains on the abrasive surface side because electrolysis is used.

For the above reasons, the cost is high and the productivity is not good.

Therefore, the present invention was made to solve the above-mentioned conventional problems, and the frame mold is easy to remove and can be reused, and there is no need to finish the abrasive surface by electrolysis, and it is low cost. The purpose of the present invention is to provide a method for manufacturing an electrodeposition tool with high productivity.

[Means to solve the problem]

The method for manufacturing an electrodeposition tool of the present invention which achieves the above object involves aligning and bringing abrasive grains into close contact with the molding surface of a frame, fixing the abrasive grains by nickel plating, and then removing the frame. Therefore, a coating of a low-melting metal is formed on the molding surface of the frame in advance, the temperature is raised to melt the coating, and the abrasive grains are aligned, and then the temperature is lowered to solidify the molten metal to temporarily form the abrasive grains. This process involves fixing the material and then applying Ni-Nokel plating to the required thickness.

[Function] Since the abrasive grains are temporarily fixed using a low-melting metal coating pre-formed on the molding surface of the frame mold, and then permanently fixed with nickel paint, when removing the frame mold, simply remove the abrasive grains. This can be done by raising the temperature to the melting point of the low melting point metal coating. As a result, the film interposed between the frame mold and the abrasive grains and temporarily fixing the abrasive grains melts and flows out, and the frame mold can be easily removed. Therefore, there is no need to remove the frame by cutting or breaking it as in the conventional case, and the frame can be reused repeatedly.

In addition, after removing the frame mold, in order to ensure an appropriate amount of abrasive grain protrusion, a predetermined amount of nickel plating on the abrasive surface side, which conventionally fills in between the abrasive grains, is removed using electrolysis to finish the abrasive surface. There was a need. However, in the present invention, the thickness of the low melting point metal film that is formed in advance by plating is formed to a thickness that corresponds to the amount of abrasive grain protrusion, and the film is finally melted and removed. Because of this, there is no need to finish the abrasive surface using electrolysis, which requires equipment costs and processing time.

In this way, low cost and high productivity can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
Figures (a) to (barrel) are manufacturing process diagrams showing the first embodiment of the present invention. 1 is a metal cylindrical frame mold, the inner diameter surface of which is the molding surface 2. When the molding surface 2 is on the inner side, the metal material of the frame mold 1 is desirably a material having a coefficient of linear expansion larger than that of nickel, such as a copper-based alloy, for ease of removal.

First, lead (pb) is applied to the molding surface 2 of this frame mold 1.

A coating 3 made of a low melting point metal such as tin (Sn) is formed in advance by plating to a predetermined thickness (FIG. 1B)).

On the molding surface 2 on which the coating 3 is formed, diamond, C
Abrasive grains 4 such as BN are arranged in a single layer in close contact with each other. At this time, the temperature is raised to the melting point of the low melting point metal of the coating 3 to melt the coating 3 and align the abrasive grains 4. The abrasive grains 4 are made to bite into the molten low melting point metal film. Next, by lowering the temperature, the molten low-melting point metal coating 113 is solidified, and the abrasive grains 4 are temporarily fixed and held on the molding surface 2 (see FIG.
C)).

In this state, nickel plating is applied to the inner surface of the frame 1 to a required thickness to form a nickel plating layer 5 (see Fig. 1).
d)). As shown in an enlarged view in FIG. 2, the nickel plating layer 5 enters the gap between the abrasive grains 4 temporarily fixed to the coating 3, and permanently fixes the abrasive grains 4.

Here, the thickness of the low melting point plating film 3 is preferably formed to a thickness commensurate with the amount of abrasive grain protrusion on the grinding surface of the finished grindstone. In order to obtain the optimum abrasive grain/protrusion amount, it is preferable that the diameter of the abrasive grain 4 is about 1/3. If the thickness exceeds this, the thickness with which the reinforcing nickel plating layer 5 wraps around the abrasive grains 4 becomes less than 2/3 of the abrasive grains 4, which is too thin and the strength to hold the abrasive grains 4 becomes weak. On the other hand, if the coating 3 is too thin, it becomes difficult to securely hold the abrasive grains 4 on the molding surface 2 of the frame, which is meaningless.

Thereafter, the temperature is raised to the melting point of the coating 3 on which the abrasive grains 4 are temporarily fixed, and the frame 1 is removed. At this time, the coating 3 having a low melting point melts due to the temperature rise, and the frame 1 having a large coefficient of linear expansion thermally expands more than the nickel plating layer 5, so that the frame 1 is easily removed.

The melted coating 3 also flows and is separated and removed from the abrasive grains 4. In this way, an intermediate product is obtained in which the abrasive grains 4 are embedded and fixed to the outer surface of the thick nickel plating layer 5 by about 2/3 of the grain size (
Figure 1(e)).

Insert the mandrel 6 into the center of this intermediate product and position it (
Figure 1)).

Finally, a molten sintered metal alloy 7, which has a higher melting point than lead or tin but has a relatively low melting point, is poured into the space between the core metal 6 and the nickel plating layer 5, and is cooled and solidified. The mounting tool 10 is completed (FIG. 1(g)).

According to the above process, the frame mold 1 and the abrasive grains 4 are simply joined through the coating 3 of a low-melting point metal, and by melting the coating 3, it is easy to avoid cutting or breaking. Since it can be removed and its original shape and dimensions are maintained, it can be reused many times.

Moreover, the time required for its removal can be extremely short.

In addition, the dimensional accuracy of the abrasive surface 10a of the completed electrodeposition tool 10 is not cut to remove the frame 1, and the accuracy of the forming surface 2 appears as it is, so it is easy to control.
High precision is easy to obtain.

FIG. 3 shows a second embodiment.

The manufacturing process of this embodiment is to apply nickel plating to the required thickness on the inner surface of the frame 1 and to form the nickel plating layer 5 (FIGS. 3(a) to 3(d)). This is the same as in FIGS. 1(a) to 1(d) of the embodiment.

The subsequent steps are somewhat different. That is, in the case of this embodiment, before removing the frame 1, the mandrel 6 is inserted into the center and positioned (FIG. 3(C)).

Next, a molten sintered metal alloy 7, which has a higher melting point than lead or tin but has a relatively low melting point, is poured into the space between the core metal 6 and the nickel plating layer 5, and is cooled and solidified. 3
Figure)).

Finally, the temperature is raised to the melting point of the coating 3 on which the abrasive grains 4 are temporarily fixed, and the frame molding is removed, completing the electrodeposition tool 10 (FIG. 3 (6)).

The functions and effects of this embodiment are the same as those of the first embodiment.

In addition, in each of the above embodiments, the electrodeposition tool IO is a cylindrical grindstone,
Although the manufacturing process of the product having an abrasive surface on its outer surface is illustrated,
In addition to the cylindrical shape, if there is a disc-shaped flat grindstone, a conical grindstone as shown in Fig. 4, or a spherical grindstone as shown in Fig. 5, the frame will fit as long as there is no overhang. Removal of mold 1 is easier than with a cylindrical grindstone.

A curved whetstone with a shape that makes it impossible to cut out the frame as shown in Figure 6 (
For example, in the case of a grindstone for polishing the outer raceway surface of ball bearings,
A split mold is used as frame mold 1.

In addition, in the case of a cylindrical whetstone having an abrasive surface on the inner surface, as shown in FIG. is formed to temporarily fix the abrasive grains 4, and further a nickel plating layer 5 is formed on the outer diameter side thereof. In this case, the frame 1 is made of a metal having a coefficient of linear expansion smaller than nickel, such as cast iron plated with chromium, so that the frame 1 can be easily removed.

〔Effect of the invention〕

As explained above, according to the present invention, a coating of a low-melting metal is formed on the molding surface of the frame in advance, the temperature is raised to melt the coating and the abrasive grains are aligned, and then the temperature is lowered and the coating is melted. The metal was solidified to temporarily fix the abrasive grains, then nickel plating was applied to the required thickness to permanently fix the abrasive grains, and the frame was removed. Therefore, by melting the low melting point metal coating interposed between the molding surface of the frame and the abrasive grains, the frame can be removed non-destructively in a short time and can be reused repeatedly.

Also, if the frame is removed by melting the low melting point metal coating,
Since an appropriate amount of abrasive grain protrusion can be secured, there is no need to further finish the abrasive surface.

Thus, a method for manufacturing an electrodeposition tool at low cost and high productivity can be provided.

[Brief explanation of drawings]

Figure 1 (a) or odor is a schematic diagram illustrating an example of the manufacturing process of the present invention, Figure 2 is an enlarged view of the main part of Figure 1 (d), and Figure 3 (a) or odor is a schematic diagram illustrating an example of the manufacturing process of the present invention. Schematic diagrams illustrating other examples of the manufacturing process of the invention, and Figures 4, 5, 6, and 7 are schematic diagrams illustrating cases of electrodeposition tool shapes other than those shown in Figure 1, respectively. It is a diagram. 1-.- Frame mold, 2-.- Molding surface, 3- (of low melting point metal)
coating, 4-abrasive grains, 5... nickel plating layer.

Claims (1)

[Claims] (1) In a method for producing an electrodeposition tool, in which abrasive grains are aligned and brought into close contact with the molding surface of a frame mold, the abrasive grains are fixed by nickel plating, and then the frame mold is removed, the molding surface of the frame mold is preliminarily coated with a low-melting-point powder. A metal film is formed, the temperature is raised to align the abrasive grains while the film is melted, the temperature is then lowered to solidify the molten metal and the abrasive grains are temporarily fixed, and then nickel plating is applied to the required thickness. 1. A method for manufacturing an electrodeposition tool, comprising the step of applying.