JPH0379264A - Cutting wire tool - Google Patents

Abstract

PURPOSE:To cause no gap on the boundary face of a brazing filler metal and an abrasive grain even at the curved part abutting on a wheel, by brazing the high hardness abrasive grain of a diamond, etc., to a high tension wire. CONSTITUTION:A cutting wire tool 1B brazes and fixes a diamond crystal particle abrasive grains 2 by a silver solder containing titanium on the outer peripheral face 9 of a core wire 5. In this case, the abrasive grain 2 and a brazing filler metal 4 are well wet, the boundary face is chemically bonded and so no gap is caused on the boundary face of the brazing filler metal 4 and abrasive grain 2 even at the curved part abutting to a wheel. Consequently, the tool life can be extended.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cutting wire tool, and more particularly, to a cutting wire tool that is suspended from a plurality of wheels and circulates in one direction. It is used in the field of cutting ceramics, cast iron, various composite materials, etc.

[Conventional technology]

Conventionally, wire-shaped tools are known in which high-hardness abrasive grains such as diamond particles are electrodeposited and fixed to the outer peripheral surface of a wire-shaped core wire by nickel plating.

There are two cutting methods using this wire-shaped tool: Namely, (1) A method in which both ends of a wire-shaped tool are tensioned and fixed, and the wire-shaped tool is reciprocated relative to the workpiece for cutting.

(2) A method in which a wire-shaped tool, which is suspended from multiple wheels and continuously circulates in one direction, is brought into contact with the workpiece to cut it.

In any of the above conventional methods, since it is a plated bond of nickel or the like that binds high-hardness abrasive grains such as diamond grains to the outer peripheral surface of a core wire such as a high-tensile wire, the abrasive grains and There is no chemical bond between the bond and the abrasive grain, which is a non-conductive conductor, and the plated metal that is deposited and grown on the surface of the core wire, which is a FL conductor, simply holds the abrasive grain mechanically. The configuration is as follows.

Therefore, it is often caused by the generation of heat from cutting.

There were problems such as the bond expanding and the holding force becoming loose, reducing the cutting force or causing the abrasive grains to fall off. In addition, especially in method (2), since the core wire is suspended from a wheel and circulated, the abrasive grains attached to the outer peripheral surface of the core wire are stretched by the curvature of the tool in contact with the wheel. When bonding, since there is no bonding force with the abrasive grains due to the plating bond, voids are created between the abrasive grains and the bond.
There were problems such as the abrasive grains easily falling off.

Furthermore, if voids are created at the boundary between the abrasive grains and the bond due to the thermal expansion or stretching, the heat transmission rate will be significantly reduced and heat dissipation will be inhibited, so cutting heat will accumulate in the abrasive grains, resulting in an overheated state. However, there was also the drawback that the cutting force decreased due to graphitization of the diamond grains.

[Problem to be solved by the invention]

The purpose of the present invention is to solve the above-mentioned problems of the conventional cutting wire tools, and to solve the problems of the above-mentioned conventional cutting wire tools, and to improve bond retention in both of the above-mentioned cutting methods (1) and (2). does not deteriorate, and therefore the cutting force does not decrease.

(b) High hardness abrasive grains do not fall off even when the tool is curved,
Cutting force can be maintained for a long time.

(c) Heat radiation during cutting is active and overheating does not occur.

The object of the present invention is to provide an excellent cutting wire tool that satisfies the above requirements.

[Means and effects for solving the problems] The gist of the cutting wire tool according to the present invention is as follows. That is, in a cutting wire tool in which a high-tensile strength wire is used as a core wire and high-hardness abrasive grains such as diamond are bonded to the outer peripheral surface of the wire with a metal bond, the high-hardness abrasive grains such as diamond are soldered to the high-tensile strength wire. This is a cutting wire tool that is characterized by:

As mentioned above, the cutting wire tool according to the present invention is characterized in that a chemical bonding force is added between the abrasive grains and the soldering material of the bond, and the cutting wire tool according to the present invention is different from the conventional similar wire-shaped tool. Compared to the case where the abrasive grains are bound to the core wire only by the mechanical holding force of the plated metal, the abrasive grains are bound much more strongly. Therefore, all the above-mentioned problems of conventional wire-like tools are overcome by the cutting wire tool according to the present invention.

Next, an outline of the method for manufacturing the above-mentioned cutting wire tool will be explained. First, high-hardness abrasive grains such as diamond grains are temporarily attached to the outer periphery of a high-tensile wire using an adhesive. There is no need to specifically limit the adhesive, but at least 300~
Adhesives that evaporate at temperatures of 400°C are desirable.

The high tensile strength wire to which the above abrasive grains have been temporarily attached is housed in a mold,
The mold is placed in a heating furnace. Next, Ag--Cu brazing filler metal powder is sprinkled on the high-tensile wire in the mold to which the high-hardness abrasive grains have been temporarily attached. The brazing filler metal is preferably an Ag-Cu type, but a strong Ag-Cu type brazing filler metal powder containing a small amount of Ti is more desirable.

Next, the inside of the heating furnace is made into an inert gas atmosphere, and then heated to a temperature of 30 to 50° C. above the melting point of the brazing material. This heating causes the powdered Ag-Cu brazing filler metal to melt and bond the high-hardness abrasive grains such as diamond grains, and also melts and flows into the gap between the high-tensile wire and the abrasive grains, solidifying the abrasive grains to the wire. Glue to.

At this temperature, the temporary adhesive vaporizes and the abrasive grains are firmly soldered to the wire.

After the soldering work is completed, the high tensile strength wire to which the abrasive grains have been soldered is taken out, and both ends are connected to specified dimensions, completing the production of the cutting wire tool according to the present invention.

〔Example〕

A conventional cutting wire tool IA shown in FIG.
Cutting wire tool I according to the invention shown in FIG.
The structure and function of B will be compared and explained. FIG. 3 is a schematic overall view showing the state in which these wire-shaped tools are in cutting operation.

The cutting wire tool 1 has a plurality of wheels 6A, 6
B by rotating the wheel 6A by a drive motor (not shown).

It moves circularly in one direction. The workpiece 7 is pressed against the cutting wire tool that circulates in this manner and is cut.

As shown in FIG. 1, the conventional cutting wire tool IA has a plating bond 3 made of nickel or the like on the outer peripheral surface 9 of the core wire 5.
Diamond crystal grain abrasive grains 2 are fixed by electrodeposition. Therefore, since the abrasive grains are merely mechanically held by the plated metal, the curved part in contact with the wheel requires a considerable thickness to at least half bury the abrasive grains. When the bond 3 is stretched, a gap 8 is generated at the boundary between the abrasive grain and the bond.

In the cutting wire tool IB according to the present invention, as shown in FIG. 2, diamond crystal grain abrasive grains 2 are soldered and fixed to the outer peripheral surface 9 of a core wire 5 using silver solder containing titanium. Since the abrasive grains 2 and the brazing material 4 are well wetted and their interfaces are chemically bonded, no gap will be formed at the interface between the brazing material 4 and the abrasive grains 2 even at the curved portion in contact with the wheel. Therefore, the tool life could be extended to more than twice that of the conventional method.

〔Effect of the invention〕

A cutting wire tool according to the present invention is a cutting wire tool in which a high-tensile strength wire is used as a core wire, and high-hardness abrasive grains such as diamond are bonded to the outer peripheral surface of the core wire with a metal bond. Since it was soldered with wax, the following effects could be achieved.

(B) Since the high hardness abrasive grains and the high tensile strength wire are soldered together with silver solder containing Ti, there is no gap at the interface between the brazing material 4 and the abrasive grains 2 even at the curved part that contacts the wheel. .

As a result of (b) and (a), high-hardness abrasive grains such as diamond hardly ever fall off, and the cutting strength can be maintained for a long time, extending the service life more than twice as much as before.

(c) Since the diamond abrasive grains etc. are strongly bonded to the brazing material, heat dissipation is good, and the diamond abrasive grains are not graphitized by heating due to cutting heat, and good machinability is maintained. Be able to do it.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a conventional cutting wire tool, FIG. 2 is a sectional view showing the structure of a cutting wire tool according to the present invention, and FIG. 3 is a schematic overall view showing the cutting situation of the cutting wire tool. . Fig. 1 1 (IA, IB)... Cutting wire tool 2
...High hardness abrasive grains, 3... Bond material 4...
Brazing material. 5... Core wire (high tension wire)

Claims (1)

[Claims] (1) In a cutting wire tool in which a high-tensile strength wire is used as a core wire and high-hardness abrasive grains such as diamond are bonded to the outer peripheral surface of the wire with a metal bond, the high-hardness abrasive grains such as diamond are soldered to the high-tensile strength wire. A cutting wire tool characterized by: