JP2000233318A - Beads of diamond wire saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the initial cutting speed by forming beads such that at the initial stage of use, only a part of a cutting surface of each bead function to minimize cutting resistance in initial cutting of each bead. SOLUTION: Each contact surface 3 with a material to be cut of a number of beads 2 fitted at required spaces to a steel rope as a core wire is shaped such that the middle is increased in thickness like a drum, an inclined surface B sloping one way only is formed, it is rhombic, the central part is reduced in diameter like a twin mountain, or the like, whereby at the initial stage of use, only a part of the cutting surface of each bead functions. The length 3 is increased to exceed the outside diameter as much as possible as far as the cutting speed in the course of use except the initial stage is enough tolerable. Thus, it is possible to overcome the disadvantage that the initial cutting speed is low, which is frequent in a tool containing diamond abrasive grains and also remarkably improve the period of service life.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to beads (contacts) of a diamond wire saw mixed with diamond abrasive grains.
It is about.

[0002]

2. Description of the Related Art Conventionally, the cutting surface of diamond beads of a wire saw into which diamond abrasive grains are mixed has a flat surface, so that there is a disadvantage that the sharpness of the diamond saw is poor particularly at the beginning of use. And, as a known basic property of a cutting tool mixed with diamond abrasive grains, in a certain metal bond,
There is a fact that when the amount of diamond per unit volume is large, the sharpness becomes poor and the life is prolonged, and when the amount of diamond is small, the sharpness is improved but the service life is shortened. Also, for a fixed amount of diamond per unit volume, the fact that wrapping it with a hard metal bond increases the life but reduces the sharpness, and wrapping it with a soft metal bond improves the sharpness but shortens the life There is also. Therefore, to achieve a tolerable initial cutting speed with a flat cutting surface, the amount of diamond had to be considerably reduced. Furthermore, in a tool mixed with diamond abrasive grains, a segment formed with a certain amount of metal bond and a certain amount of diamond per unit volume "The longer the length in the cutting direction, the worse the sharpness. It is also known from the fact that almost all diamond beads have a length of at most about 90% of the outer diameter in order to enable an acceptable initial cutting speed. (For example, a length of 9 mm for an outer diameter of 11 mm and a length of 8 mm for an outer diameter of 10.5 mm) And again, if the length of a diamond segment in a tool mixed with diamond abrasive grains is short, As is also known, "the life is shortened and the life is increased when the life is long," the conventional diamond wire saw has a serious drawback in that the service life of any of them is very short.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diamond wire saw bead whose initial cutting speed can be remarkably improved as compared with the conventional one, and whose service life can be greatly improved. It is in.

[0004]

Means for Solving the Problems A steel wire, which is a core wire in which several metal wires are twisted, is provided with a large number of beads interposed at required intervals, the beads being in contact with a work to be cut mixed with diamond abrasive grains. A diamond wire saw bead that is formed into a shape in which only a part of the cut surface of the bead functions at the beginning of use, and the cutting resistance in the initial cutting of each bead is reduced as much as possible.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a contact surface 3 of a bead 2 attached to a steel wire 1 serving as a core wire at a required interval to a workpiece is formed in a drum-like shape with a thick middle portion. Shape A
Alternatively, the shape is such that only a part of the cut surface of the bead functions at the initial stage of use, such as E or F, such as a single-sided inclined surface B or rhombus C or a twin mountain shape D having a small diameter at the center. Also, the length 3 should be longer than the outer diameter 4 as long as possible, as long as the cutting speed during use except during the initial stage can be sufficiently tolerated.

[0006]

As described above, the present invention eliminates the disadvantage that the initial cutting speed is slow, which is often seen in tools mixed with diamond abrasive grains, and at the same time, greatly improves the useful life that can be realized. That is, in the present invention, it is possible to provide a bead of a diamond wire capable of improving performance, sharpness and life, without increasing the amount of diamond per unit volume.

[Brief description of the drawings]

FIG. 1 is a side view of each embodiment.

FIG. 2 is a side view showing an example in which beads of the diamond wire saw of the present invention are mounted on a diamond wire.

[Explanation of symbols]

 Reference Signs List 1 saw body 2 contact 3 contact length 4 outer diameter

Claims (3)

[Claims] A steel wire, which is a core wire in which several metal wires are twisted, is provided with a large number of beads (contacts) contacting a work to be cut mixed with diamond abrasive grains at required intervals. A diamond wire saw bead that is formed into a shape in which only a part of the cut surface of the bead functions in the initial stage of use, and the cutting resistance in the initial cutting of each bead is reduced as much as possible. 2. The diamond wire saw beads according to claim 1, wherein the beads are formed into a drum-shaped contact surface having a thick central portion, a single-flow inclined shape, a rhombus shape or a twin mountain shape having a small diameter in the middle. 3. The bead of the diamond wire saw according to claim 1, wherein the length of one bead is increased.