JPH0450967Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a semi-finished product of an abrasive molded body that becomes a die for drawing wire by drilling the required through holes (in this text, it is called a die blank). related to).

PRIOR ART Abrasive compacts are well known in the art and essentially consist of a bonded body, generally present in an amount of at least 70 percent, preferably from 80 to 90 percent, of the compact's volume. It consists of polycrystalline agglomerates of abrasive particles that have become hard mixed crystals. The polycrystalline agglomerate contains a considerable amount of particles directly bonded to each other. The compact abrasive particles are carbide abrasives such as diamond and cubic boron nitride.

Abrasive compacts can be produced by self-bonding. That is, the individual particles of the compact may be melted and bonded together without the aid of a second phase (also known as a bonding matrix). Alternatively, a second phase can also be present. If a second phase is present, it necessarily contains the catalyst for synthesizing the particular particles used. Examples of suitable catalysts for cubic boron nitride synthesis are aluminum alloys containing aluminum with nickel, cobalt, iron, manganese or chromium. Examples of suitable catalysts for the synthesis of diamond are metals from groups of the periodic table, such as cobalt, nickel, iron, and alloys containing metals from groups of the periodic table.

Abrasive compacts are produced under high temperature and pressure conditions where the particles used are crystallographically stable. This manufacturing takes place in conventional high pressure and high temperature equipment.

Abrasive compacts are always produced in the form of discs. The disc-shaped abrasive compact may be used as is, or may be cut or otherwise shaped into another usable shape. Union of South Africa Patent No.
The complete specification of No. 78/4716 describes a method for cutting disc-shaped abrasive compacts into various shapes and claims a patent for this method. The various shapes disclosed in this complete specification are cubic, cylindrical, conical, truncated conical, truncated pyramidal, quadrilateral, and triangular. These various shapes are noted to be useful for wire drawing die blanks and drill bits.

Wire drawing die blanks consisting of disk-shaped abrasive compacts are disclosed in the literature and are also available on the market. Such disk-shaped abrasive compacts are generally mounted within a support ring made of a suitable metal or cemented carbide.

(Problem of the invention) The object of the invention is to provide a die blank for wire drawing that can more efficiently utilize the disc-shaped abrasive molded body as described above and is therefore cheaper.

(Means for Achieving the Object) A die blank for wire drawing according to the present invention is comprised of an abrasive compact, the abrasive compact having hexagonal main surfaces on opposite ends of the abrasive compact, Planar sides are provided between the major surfaces, the major surfaces are aligned with each other, and the flat sides are perpendicular to the major surfaces.

The abrasive compact may be any abrasive compact known in the art, but is preferably a diamond abrasive compact.

Further, it is preferable that the abrasive molded body has a fine grain structure.

The above structure is typically used at 25
It can be made by using fine abrasive particles, which are submicron particles. Such a fine grain structure gives the wire an excellent surface finish.

(Operations and Effects) According to the configuration of the present invention, the abrasive molded body serving as a die blank for wire drawing has a substantially hexagonal column shape. By touching each other's flat side surfaces, the hexagonal pillar-shaped polished molded bodies can be adjacent to each other without leaving wasted space between the molded bodies. Follow. This will be explained later with reference to drawings,
It is possible to cut out the disc-shaped abrasive compact by maximizing the use of raw materials and minimizing waste. In this way, since the portion to be discarded can be minimized, the unit price of each abrasive molded body serving as a die blank can be lowered. In addition, this cutting work can be minimized between adjacent abrasive molded bodies, and can be performed more efficiently.

The die blank of the present invention may be used without special support or supported by suitable side supports, such as those made of cemented carbide. In either case, it can be attached to a support structure for drawing in a conventional manner using low temperature brazing techniques. In this case, the six sides of the abrasive compact of the present invention can provide a relatively large area for supporting the blank, eliminating the need for special side supports and making the die blank easier to use. significantly improve.

Embodiment FIG. 1 shows an embodiment of an abrasive compact serving as a die blank of the present invention, the abrasive compact having major surfaces 10 and 12 at opposite ends. Both major surfaces 10 and 12 are hexagonal and are aligned with each other. Major surfaces 10 and 12 are major surfaces 1
It is connected to a side surface 14 that is perpendicular to 0 and 12.

The abrasive compact shown in FIG. 1 can be cut, as shown in FIG. 2, from a disc-shaped abrasive compact 16 of the type manufactured in conventional high pressure and high temperature equipment.
A number of hexagonal abrasive compacts are cut along the lines shown in FIG. 2 using standard cutting techniques such as electrical discharge machining or laser cutting. The hexagonal shape is efficient because adjacent hexagonal abrasive compacts have a common border, minimizing the number of cuts that must be made to produce a given number of abrasive compacts. Enables cutting work. Furthermore, as shown in Figure 2, the hexagonal abrasive molded body can be cut from the disc-shaped abrasive molded body without leaving any gaps between adjacent molded bodies, so it is possible to cut out the hexagonal abrasive molded body from the disc-shaped abrasive molded body, which is an expensive material. Most of the molded product can be used effectively.

The abrasive molded body shown in Figure 1 can be used as it is as a die for wire drawing without the need for side supports.
Can be used as blank. The six sides of the hexagonal abrasive compact provide a relatively large area for brazing the die blank into a wire drawing support structure in a conventional manner. In order to complete this die blank as a wire drawing die, a hole of the size and shape required for the drawing process is cut into the main surface 10 of the abrasive compact.
and 12.

Next, an example in which side supports are provided on the abrasive molded body shown in FIG. 1 will be described with reference to FIG. 3. First, a pair of cups 18, 20 that will serve as side supports are manufactured. Each cup is circular in outline when viewed in plan, i.e. from above or below along the page of FIG. 3, and has a cavity 2 which is also circular in plan.
2 is formed. The diameter of each cavity 22 is approximately the same as the maximum distance across the hexagonal major surface of the abrasive compact. Cups 18 and 20 are made of fully sintered sintered carbide (eg, sintered tungsten carbide containing 13 percent cobalt) or steel. The hexagonal abrasive compact 24 shown in FIG. It is placed over the abrasive molded body 24.
The dimensions of the cavities 22 in cups 18 and 20 are as follows:
8 is placed on its lower surface 28 and the upper surface 26 of the cup 20.
When the cups 18 and 2 are brought together, the abrasive molded body 24
Set it so that it fits exactly into the blank space 22 in 0. Using a suitable brazing material such as degassing material 4022, the abrasive compact 24 and cups 18,2 are bonded together.
Fill the space between the inner walls of 0.

The thus assembled cups 18, 20 and the abrasive molded body 24 are placed in a graphite mold and heated to a temperature of approximately 650°C, and then 6Kg/mm ² to 12
They are pressed together under a load of up to Kg/mm ² (typically 8.5 Kg/mm ² ). The cups 18, 20 and abrasive compact 24 are then removed from the mold and allowed to cool. Thereafter, the two cups 18, 20 are ground and removed to the positions indicated by dotted lines in FIG.
Expose 0 and 12. Parts of the cups 18 and 20 thus remain in the form of a ring around the abrasive compact 24 and serve as side supports, forming a die for drawing wire made from the abrasive compact with side supports.
A blank can be created. To use this die blank as a die, as in the case of the die blank without side supports described above, it is necessary to draw the abrasive compact from one exposed major surface to the other major surface. Drill a hole of size and shape.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of an abrasive molded body that is a die blank for wire drawing according to the present invention, and Fig. 2 is a disc-shaped abrasive molded product obtained by cutting out a plurality of pieces of the abrasive molded body of Fig. 1. The plan view of Figure 3 is the top view of Figure 1.
FIG. 3 is a cross-sectional side view for explaining an example in which a side support is provided on the abrasive molded body shown in the figure. 10, 12...Main surface, 14...Side surface, 24
...Abrasive molded body.

Claims (1)

[Claims for Utility Model Registration] (1) A die blank for wire drawing comprising an abrasive compact, the abrasive compact having hexagonal main surfaces at opposite ends thereof; , with flat sides between the major surfaces, the major surfaces being aligned with each other;
A wire drawing die blank, wherein said flat side is perpendicular to said major surface. (2) Utility model registration The die blank for wire drawing according to claim 1, wherein the abrasive compact is a diamond abrasive compact. (3) In the die blank described in paragraph 1 or 2 of the claims for utility model registration,
A die/blank for drawing wire that has a fine grain structure.