JPS61121817A - Wire for wire saw - Google Patents

Abstract

PURPOSE:To enhance cut off speed and durability, by coating the surface of a wire body with a metal layer having crack grooves, to forcibly slide abrasive grains on the surface of a workpiece. CONSTITUTION:The surface of a steel wire body 1 is provided with a hard nickel plating of 5mum in thickness. The wire body 1 is elongated to a diameter of 0.16mmphi by a die so that numerous crack grooves 3 are made in the plated nickel layer 2 on the wire body 1. Abrasive grains 5 supplied in between the wire body 1 and a workpiece 4 move into the crack grooves 3 so that the abrasive grains are forcibly slid on the surface of the workpiece by the reciprocation of the wire body. This results in enhancing the efficiency of cut off.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wire for a wire saw used for cutting hard materials such as semiconductors and ceramics. A large, hard metal wire is moved back and forth under tension and is pressed against the workpiece, and hard abrasive grains such as carporundum powder are poured between the metal wire and the workpiece to control the movement of the metal wire. The workpiece is ground and cut using abrasive grains that move accordingly.

The saw wires currently in use have a smooth surface, so the power to move the abrasive grains is weak and cutting speed cannot be improved. To prevent relative displacement between the wire and the abrasive grains, the wire is coated with a relatively soft metal such as copper, nickel, or solder lambda brass, and the abrasive grains are coated on the wire by the force of pressing the wire against the workpiece. A coating layer in which the abrasive particles bite into the layer to prevent relative displacement between the wire and the abrasive grains and prevent wire wear is known from Japanese Patent Publication No. 14873/1982. In addition, the coating layer wears away in a short period of time, resulting in a wire with a smooth surface without a coating layer, reducing the cutting speed.

[Problem that the invention seeks to solve]

The present invention aims to provide a wire for a wire saw that can move abrasive grains better than the above-mentioned conventional wires and can maintain this abrasive grain movement effect for a long time.

[Means for solving problems]

The present invention constitutes a wire for a wire saw, characterized in that a metal coating layer having crack grooves is provided on the surface of the metal wire.

The wire of the present invention is made by plating the surface of piano wire or tungsten wire with a metal that has poor malleability or is highly work hardened, such as nickel, cobalt, iron, zinc alloy, etc.
By cold wire drawing, the plated layer is work-hardened, and at the same time crack grooves are generated in the plated layer, and resin masking is applied to the surface of the metal wire in spots with a roller to form a hard plating, and the masking part is melted. It is possible to create a crack groove by removing the crack by removing the crack.

Two or three of the above wires may be twisted to form a twisted wire.

[Effect]

By providing the crack grooves on the surface of the wire of the present invention, as shown in FIG.
Since the abrasive grains 5 are forced to slide against the surface of the workpiece according to the reciprocating motion of the wire, the amount of grinding increases and the cutting speed increases. If the coating layer 2 is made of hard metal, the coating layer 2 will not be easily worn out.
Even if the entrance corners of the crack grooves 3, which are prone to wear, are worn out and the crack grooves 3 become smooth four parts, the effect of forcibly moving the abrasive grains 5 remains, so the cutting speed is faster than that of a wire with a smooth surface. It has excellent cutting ability and can maintain its sharpness for a longer period of time than those with a soft metal coating layer on the surface. Further, the same effect can be obtained even when the coating layer with crank grooves is formed of a relatively soft metal.

In addition, when a twisted wire made by twisting two or three metal wires is used, the abrasive grains 5 are held on the twisted surface as shown in Fig. 3, and the abrasive grains follow the reciprocating movement and movement of the wire. Since it is forcibly moved, this action is added to the action of the crack groove 3, and the cutting speed can be further improved.

〔Example〕

The surface of a piano wire drawn to a diameter Q of 5 m was plated with hard nickel plating to a thickness of 5 μm, and the wire was drawn to a diameter of 0.16 fim through a die. The resulting wire is
As shown in FIG. 1, a large number of crack grooves 3 were formed in the nickel-plated coating layer 2 applied to the surface of the piano wire 1.

Piano wire with a diameter of 0.16 ms, diameter Q, 14 m5 piano wire plated with copper to a thickness of 10 μm, an outer diameter of 0.
A cutting test was conducted under certain conditions with the copper-plated piano wire of No. 16.

If the raw piano wire was set as 1, the copper plating coated via/wire could be cut at a speed of 1.2 times, and the wire of the present invention could be cut at a speed of 2.3 times.

Furthermore, the durability of the wire of the present invention was 1.5 times that of piano wire and copper-plated piano wire.

〔Effect of the invention〕

According to the present invention, it is possible to provide a wire for a wire saw that is superior in cutting speed and durability to conventional wire saws.

[Brief explanation of the drawing]

Fig. 1 is a partial side view of one embodiment of the wire for a wire saw according to the present invention, Fig. 2 is an explanatory diagram of the action of the wire of the invention, and Fig. 3 is an explanatory diagram of the action of another embodiment of the wire of the invention. be.

Claims (2)

[Claims] (1) A wire for a wire saw, characterized by having a metal coating layer having crack grooves on the surface of the metal wire. (2) The wire for a wire saw according to claim (1), wherein the metal wire is a stranded wire.