JPH03281117A - Wire saw - Google Patents

Abstract

PURPOSE:To restrain the wear speed of a spacer, by mixing the particulate of aluminum oxide or silicon carbide in the spacer composed of a raw material having flexibility such as resin, rubber, etc., in the wire saw for cutting a stone, etc. CONSTITUTION:This wire saw 1 is composed of a wire 2 which is a metal stranded wire, a cylindrical beads 3 numerously inserted at a constant interval to this wire 2 and a spacer 4 composed of the raw material having flexibility such as resin, rubber, etc., for coating the wire 2 by being interposed between these beads 3. The beads 3 are formed of the abrasive grain layer 5 for cutting where diamond abrasive grains and CBN abrasive grains are fixed by metal bonding and electrodeposition on the outer peripheral part of a cylindrical sleeve 3A. In the spacer 4, the particulates 20 of aluminum oxide or silicon carbide are mixed with their dispersion uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wire saw used for cutting stones, concrete structures, etc.

[Background Art] In recent years, a cutting method using a wire saw has been attracting attention as a means for cutting and dismantling stones and reinforced concrete structures such as buildings and bridges.

As shown in FIG. 2, this wire saw 1 has cylindrical beads 3 arranged at predetermined intervals on a wire 2, which is a twisted metal wire.
A large number of beads are inserted between the beads 3 and 3.
・A spacer 4 made of a flexible material such as resin or rubber to keep the distance constant and protect the wire 2.
The bead 3 has a cutting abrasive grain layer 5 in which abrasive grains such as diamond or CBN are fixed by metal bonding or electrodeposition on the outer periphery of a cylindrical sleeve 3A. The configuration is as follows.

As shown in FIG. 3, the wire saw I is wound around the object 6 to be cut and connected endlessly, and then attached to the pulley 8 of the drive device 7, and the pulley 8 is driven to rotate. By running at a high speed of 1000-1800 m/min, the abrasive layer 5 of the wire saw 1 cuts the object 6. The drive device 7 is configured to move backward on the table 9 on which it is installed relative to the object to be cut 6 as cutting progresses.

Gonoyo :) The I゛ Tsuiya Saw is -■- Light in weight,
It has advantages such as low noise and vibration, and is expected to be an alternative to stone cutting, which traditionally relied on zergura saws, and the demolition of concrete structures, which was conventionally done by impact destruction or blasting. ing.

It also has many advantages, such as cutting and removing underwater structures such as concrete bridge girders, which was previously considered impossible, and making it possible to simultaneously cut reinforced concrete by using a wall wire saw.

[Problems to be Solved by the Invention]However, with a wire saw having the configuration as described above, when cutting, for example, a concrete prismatic column, etc., the spacer may be worn out by the corners of the object to be cut. Something happened. In such a situation, the wire saw will oscillate sharply, making it difficult to cut accurately, and the wire protected by the spacer will be exposed and may come into contact with the object to be cut. This causes severe wear and tear, which significantly shortens the life of the wire saw.

In addition, since these wire saws are used at high speeds, it is difficult to measure the degree of wear on the spacer and wire during cutting, and it is possible to continue work without noticing the wear on the wire. IJ, there is a possibility that the wire will eventually be cut. If the wire is cut during the cutting operation, the wire, which was moving at high speed, will bounce around, creating a risk of injury and damage to nearby equipment.

The present invention has been made in order to solve the above-mentioned problems, and consists of a metal stranded wire and a layer of cutting abrasive grains that are white and spaced apart from each other at regular intervals. This wire saw is equipped with a large number of cylindrical beads that are fitted, and a spacer made of a flexible material such as resin or rubber that is interposed between these beads and covers the wire. The spacer is characterized in that fine particles having wear resistance such as aluminum oxide and silicon carbide are dispersed and mixed therein.

Note that spacers are generally made by arranging beads at predetermined intervals on a wire and then molding them by injection molding, etc., so the above-mentioned fine particles are diffused and mixed into a molding resin, etc., and then molded. Thus, the wire saw of the present invention can be obtained.

[Function] In the present invention, fine particles of aluminum oxide and silicon carbide, which are generally used as abrasive grains for grinding and have hardness second only to diamond and CBS, are dispersed and mixed into the spacer. When the material is worn out, these fine particles are exposed and come into contact with the object to be cut.Since such fine particles are not easily worn away, the frictional resistance caused by contact with the object to be cut causes the fine particles to The wear of the spacer can be prevented until the particles fall off from the spacer.As the fine particles fall off, the wear of the spacer starts again, but this exposes new fine particles and prevents the wear of the spacer. do.

By repeating such action, the fine particles act as a wear-resistant material, and the speed at which the spacer wears can be suppressed.

Embodiment FIG. 1 is a sectional view of a wire saw showing an embodiment of the present invention. Note that the same parts as in the conventional example shown in FIG. 2 are given the same reference numerals.

This wire saw 1 includes a wire 2 which is a twisted metal wire,
A large number of cylindrical beads 3 are inserted into the wire 2 at regular intervals, and a flexible material such as resin or rubber is inserted between these beads 3 and covers the wire 2. The bead 3 has a cutting abrasive grain layer 5 in which diamond abrasive grains or CBN abrasive grains are fixed by metal pounding or electrodeposition on the outer periphery of a cylindrical sleeve 3A. It has a formed configuration.

Fine particles 20 of aluminum oxide or silicon carbide are mixed in the spacer 4 in a uniformly dispersed manner.

The wire saw 1 having such a configuration has beads 3 on which an abrasive grain layer 5 is formed arranged on the wire 2 at predetermined intervals.
The spacer 4 can be easily obtained by uniformly dispersing and mixing fine particles 20 in advance into the molten resin to be injected, and then injection molding to form the spacer 4.

To use the wire saw of this embodiment, as in the case of the conventional example, as shown in FIG. Connect endlessly. Then, the pulley 8 of the drive device 7 is driven to rotate, and the wire saw 1 is run at high speed to cut the object 6. At this time, as the cutting progresses, the drive device 7 moves backward relative to the object to be cut 6, so that the object to be cut 6 is always cut in a state in which it is in pressure contact with the wire saw 1.

According to the wire saw of the present invention, the fine particles act as a wear-resistant material due to the above-mentioned action, and can suppress the rate of wear of the spacer, so that the wire is exposed and worn due to wear of the spacer. This can prevent the life of the wire saw from being shortened. Further, it is possible to prevent a situation where the worker continues to work without noticing the wear of the wire and the wire saw is cut, thereby injuring the worker or damaging nearby equipment.

In addition, the particle size of the fine particles dispersed in the spacer is as follows:
Although it varies depending on the hardness and shape of the object to be cut, usage conditions, etc., it is generally preferable to use #325 to #1000. If the particles are smaller than this, no gap will be created between the spacer surface and the surface of the workpiece, and the above effect will not occur. Conversely, if the particles are larger than this, the frictional resistance applied to the particles during cutting will be large. If it becomes too much, the particles will easily fall off from the spacer, and the above-mentioned effect will no longer occur.

[Effects of the Invention] As explained above, according to the wire saw of the present invention,
By dispersing and mixing fine particles of aluminum oxide or silicon carbide into a spacer made of flexible materials such as resin or rubber, these fine particles act as a wear-resistant material and suppress the wear rate of the spacer. I can do it.

This prevents the wire from being worn out and shortening the life of the wire saw, and also prevents accidents caused by cutting the wire saw.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the wire saw of the present invention, and FIG. 2 is a sectional view showing a conventional wire saw. In addition, Figure 3 shows that using a wire saw like this,
It is a figure which shows the example of use when performing cutting work. l... Wire saw 2... Wire 3... Bead, 3A... Sleeve, 4... Spacer, 5... Abrasive grain layer, 6... Object to be cut, 7... Drive device, 8 ...Pulley, 9...stand, 20...fine particles.

Claims (1)

[Claims] A wire made of stranded metal wire, a number of cylindrical beads having a cutting abrasive grain layer and fitted onto the wire at regular intervals, and a number of cylindrical beads interposed between these beads. and a spacer made of a flexible material such as resin or rubber that covers the wire, and the spacer contains dispersed fine particles having wear resistance such as aluminum oxide or silicon carbide. A wire saw characterized by: