JPH10202534A - Manufacture of diamond tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method in which a diamond tool whose diamond particle is almost uniformly distributed and surface shape and dimension are formed with high accuracy can be easily and economically manufactured, without requiring a high-grade skill. SOLUTION: The edge part of a diamond tool A is prepared by drying a buildup part 7, next, heating the part 7 in a heating furnace and burning the part 7 after paste containing diamond is made by almost uniformly mixing diamond particle in paste in which water soluble gel, propylene glycol and metal powder are mixed and the buildup part 7 is molded by applying paste containing diamond on the surface of a shank 1 for which a surface processing is performed. When a template B for application is used for the application of paste containing diamond, the shape of the edge part and the thickness dimension become exact and easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a diamond tool such as a diamond reamer or diamond bit for boring, or a saw blade or a wire saw having a diamond blade.

[0002]

2. Description of the Related Art As a technique relating to a method of manufacturing a diamond reamer for boring, there is a technique described in Japanese Patent Publication No. 62-11067. The diamond reamer for boring is to fix a large number of diamond particles on the outer peripheral surface of a cylindrical shank and enlarge (ream) an excavated hole to almost a predetermined size. It is performed in the following order.

(1) Among a plurality of locations for fixing diamond particles of a shank, the surface of one location is held horizontally,
Apply adhesive. (2) Spray diamond particles on the surface to which the adhesive is applied (further sprinkle with tungsten carbide powder). (3) Other places where diamond particles are fixed are also described in (1) above.
Perform the same operation as (2). (4) A hard metal (nickel-chromium alloy, etc.) is sprayed onto the surface of the diamond particles to spray. (5) Finish by machining (since there is no description of the finish processing part, it is unknown whether correction processing of the surface shape and dimensions of the metal sprayed surface is included). (6) The scale is removed by sandblasting or the like (metal particles that are scattered and fixed in the vicinity of the metal sprayed surface may be removed, but are not described). Through the above steps, a diamond reamer is manufactured.

[0004]

In the method for producing a diamond reamer as described above, a hard metal is sprayed on the surface on which the diamond particles are scattered and sprayed, so that not only the distribution of the diamond particles tends to be non-uniform, but also There are problems such as scattering of molten metal particles and difficulty in ensuring the dimensional accuracy and shape accuracy of the surface of the raised metal sprayed surface, and high levels of skill are required for metal spraying so that these problems do not occur. is required. In addition, after metal spraying, there is a problem that the manufacturing cost is high because the number of man-hours required for finishing work and post-processing work for sandblasting. The present invention provides a manufacturing method that can easily and economically manufacture a diamond tool that does not require a high level of skill, has diamond particles distributed almost uniformly, and has a surface shape and dimensions formed with high precision. Things.

[0005]

In order to achieve the above object, a method for producing a diamond tool according to the present invention is characterized in that a water-soluble gel or a fine metal powder (bronze or nickel, In some cases, this is mixed with titanium), and diamond particles are added thereto to form a paste containing diamond particles. The paste containing diamond particles is applied to a predetermined position on the surface of a tool material that has been surface-treated in advance. After forming a raised portion of the paste, the paste is dried, and then heated in a heating furnace to bake the paste, whereby the diamond particles are fixed to the surface of the tool material.

[0006] In addition to the diamond particles, a cemented carbide powder such as tungsten carbide may be added to the paste and mixed. In order to form a raised part of the paste containing diamond particles, after applying a coating template having a notch to the surface of the tool material which has been subjected to surface treatment in advance, the paste containing diamond particles is placed in the notch. It is preferable to form a raised portion of the paste containing the diamond particles by coating. The heating furnace may be a vacuum furnace or a furnace having an atmosphere in which the inside is prevented from being oxidized.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a boring diamond reamer A showing an example of a diamond tool.
2 (A) to 2 (D) are perspective views for explaining an application procedure using the application template B. FIG. The manufactured boring diamond reamer A has substantially the same structure as the conventional boring diamond reamer, and is provided with male thread portions 2 and 3 at the upper and lower ends of a cylindrical shank 1 as a tool material. A plurality of blades 4 containing a large number of diamond particles are provided on the outer surface (see FIG. 1). But
The manufacturing method of the diamond tool of the present invention is different from the conventional manufacturing method in that a paste containing diamond particles is applied to the cylindrical shank 1 and raised, and the raised portion is formed by drying and heating to form the blade portion 4.

The method for producing a diamond tool according to the present invention comprises:
First, a paste is formed by mixing fine metal powder (bronze or nickel, and in some cases with titanium) in a water-soluble gel or a solvent containing propylene glycol as a main component. Next, diamond particles (in some cases, powder of a cemented carbide such as tungsten carbide is added to the paste) are added and mixed to form a paste containing diamond particles.

Since the diamond particles are sufficiently held in the paste and do not float during firing, they can be used widely from synthetic diamonds having a fine mesh size to large bows (natural diamonds). This paste containing diamond particles is applied to the position of the blade portion 4 on the surface of the shank 1 which has been surface-treated in advance to form a raised portion having a predetermined shape and thickness.

In order to make the raised portion a predetermined shape and thickness,
It is convenient to use the application template B shown in FIG. The application template B is formed in a cylindrical shape, has an inner diameter slightly larger than the outer diameter of the shank 1, and has a thickness corresponding to the height of the blade 4 containing diamond. A reference surface 5 is formed at one end of the application template B, and a notch 6 having substantially the same shape and area as the blade 4
(See FIG. 2A). Number of notches 6 arranged,
The arrangement position corresponds to the arrangement number and arrangement position of the blade portions 4.

In order to apply the paste containing diamond particles using the application template B, the application template B is inserted into the outer surface of the shank 1 and the reference surface 5 is positioned (see FIG. 2B). . Next, using a tool such as a spoon, a paste containing diamond particles is filled in each of the notches 6, and the paste is formed so that the surface of the paste is flush with the outer surface of the application template B (FIG. In C), the paste containing diamond particles is hatched to make it easier to understand).

After completion of the molding, the application template B is pulled out in the direction opposite to the reference plane 5, and a raised portion 7 of a paste containing diamond particles is formed on the surface of the shank 1 (see FIG. 2D). . Although the paste has a force of adhering to the outer surface of the shank 1, the fluidity is poor, so there is no possibility that the raised portion 7 will fall off the shank 1 or be deformed.

The shank 1 on which the raised portion 7 is formed is approximately 2
After air drying for about an hour, put it in the dryer,
C for 1 hour, then put in a heating furnace for 830
Baking the paste at a temperature of ° C. If titanium or the like in the paste is oxidized during heating and firing, the binder function is lost. Therefore, use a vacuum furnace (vacuum degree is 10.4-10.5 Torr) or a furnace containing a protective gas (reducing or neutral atmosphere). use.

During the heating and firing, the outside of the shank 1 is covered with a cylindrical carbon ring 8 (see FIG. 3) so that the paste raised portion 7 can be fired with uniform quality. Try to keep the whole soak. When the heating and sintering are completed, a blade portion 4 having a large number of diamond particles fixed inside is formed.

According to the method for manufacturing a diamond tool as described above, the diamond particles are almost uniformly distributed in the paste. Therefore, the fired blade portion 4 has the advantage that the diamond particles are almost uniformly distributed. Instead, since the raised portion 7 is formed from diamond-containing paste, the shape and dimensions of the blade portion 4 are easily and accurately formed, and the raised portion 7 is fired to manufacture the blade portion 4.
There is a great advantage that a blade portion containing diamond can be provided on a tool material having a different shape from that of the tool material.

[0016] Figure 4 is a front view of a diamond saw blade A ₁ having a blade portion of the fabricated diamonds by the production method of the present invention, the center of the thin having a shaft insertion hole 9a of the disc 9 The blade portion 10 is provided on the outer peripheral edge. The outer peripheral surface of the blade portion 10 and the shaft insertion hole 9a can be concentric, and the side surface of the blade portion 10 can be slightly projected from the surface of the disk 9. Providing such a blade portion 10 on the disk 9 cannot be achieved by the conventional metal spraying method.

[0017] FIG. 5 is a partial front view of a diamond wire saw A ₂ having a blade portion of the fabricated diamonds by the production method of the present invention. On both end surfaces of the diamond wire saw A ₂ are a number of beads 11 having a blade portion of the diamonds on the outer peripheral surface has a through hole in the center, a plastic, as well as fix the spacer 12 to be molded, such as rubber, bead 11 and A wire 13 is inserted into the spacer 12, and both ends of the wire 13 are connected by a joint 14 (see FIG. 6) to form a loop as a whole. The outer peripheral surface of the joint 14 is also provided with a diamond-containing blade portion 14a. be able to. This diamond wire saw A
₂ is used, for example, when it is wound around a concrete building and rotated to cut the concrete building.

Since the outer peripheral surface of the bead 11 has a small diameter, it is extremely difficult to manufacture the blade portion 12 by the conventional metal spraying method. However, according to the manufacturing method of the present invention, such a tool can be easily manufactured. It becomes possible to produce. In the above-described tools, all of the blade portions 4, 19, and 12 have a shape in which the surface of the blade portion is substantially parallel to the surface of the tool material, but the shape of the raised portion of the diamond paste can be freely formed. For example, it is also possible to produce a blade portion having a protruding tip, and it can be widely used for various types of diamond tools.

Since the blade portion containing diamond can cut (including grinding) a material having high hardness, it is not only widely used as a cutting tool, but also has excellent wear resistance. A diamond-containing blade portion is provided on the surface of a member used under severe conditions and the wear resistance of the member can be enhanced.

For example, the connection portion at the tip of a pipe connected immediately above a boring diamond reamer is a portion that is severely worn. This phenomenon occurs because diamond bits, which are the main cutting tool, and cutting pieces generated by cutting diamond reamers that ream the hole diameter drilled by diamond bits, are mixed in the fluid used as the discharge medium and transported from the hole bottom to the ground. This is because when it is performed, it acts continuously while largely interfering with this portion.

In particular, since the tip of the pipe connected as a reamer is connected to the reamer by forming a screw, the thickness of the pipe is also reduced. Parts have to be replaced. Since the pipe portion other than this portion can still be used, if the connection portion with high wear is coated in the same manner as the diamond-containing blade portion, a great wear prevention effect can be obtained. Therefore, the diamond tool can be applied not only to a tool intended for cutting but also to an auxiliary tool intended for enhancing wear resistance.

[0022]

Since the present invention is configured as described above, it has the following effects. (1) According to the method for producing a diamond tool of the present invention, it is possible to provide a blade portion in which diamond particles are distributed almost uniformly. (2) According to the method for manufacturing a diamond tool of the present invention, since the blade portion can be provided regardless of the shape of the surface of the tool material, there is an advantage that it can be widely applied to tools having various shapes.

(3) Since a paste containing diamond is applied to form a raised portion and then fired to form a blade, the shape, area and thickness of the blade can be accurately formed. It is not necessary to perform a large correction process that requires a great deal of man-hour after the blade portion is formed. In particular, when the application template is used, even a worker who does not have a high level of skill can accurately and easily form the raised portion. (4) In the conventional metal spraying method, since the splash of the scattered deposited metal adheres to the periphery, a cleaning step for removing the scattered metal seems to be necessary.However, the method for manufacturing a diamond tool of the present invention requires No cumbersome post-processing is required.

[Brief description of the drawings]

FIG. 1 is a perspective view of a diamond reamer A for boring showing an example of a diamond tool.

2 (A) to 2 (D) are perspective views illustrating an application procedure using an application template B. FIG.

FIG. 3 is a partially cutaway front view illustrating a use state of a heating cover.

4 is a front view of a saw blade A ₁ illustrating another example of the diamond tool.

5 is a partial front view of a wire saw A ₂ showing another example of the diamond tool.

FIG. 6 is a partially cutaway front view showing the joint portion of FIG. 5;

[Explanation of symbols]

A, A ₁ , A ₂ Diamond tool B Coating template 4, 10 Blade 1 Shank 5 Reference plane 6 Notch 7 Raised part 9 Disk 11 Bead 13 Wire

Claims (4)

[Claims] 1. A water-soluble gel, a solvent containing propylene glycol as a main component, mixed with fine metal powder (bronze or nickel, and in some cases, titanium), and diamond particles are added thereto. The paste containing the diamond particles is applied to a predetermined position on the surface of the tool material which has been surface-treated in advance to form a raised portion of the paste, and then dried, and then heated in a heating furnace. A method for producing a diamond tool, comprising fixing diamond particles to the surface of the tool material by firing a paste. 2. The method of manufacturing a diamond tool according to claim 1, wherein a powder of a cemented carbide such as tungsten carbide is added to the paste and mixed with the diamond particles. 3. The surface of the tool material which has been subjected to a surface treatment in advance,
After contacting the application template with the notch,
3. The method of manufacturing a diamond tool according to claim 1, wherein an embossed portion of the diamond particle-containing paste is formed by applying the diamond particle-containing paste in the notch. 4. The heating furnace according to claim 1, wherein the heating furnace is a vacuum furnace or a furnace having an atmosphere in which the inside is prevented from being oxidized.
Or the method for producing a diamond tool according to 2.