JPH06134749A - Wire saw - Google Patents

Abstract

PURPOSE:To obtain wire saw, which can easily and surely identify and improve the efficiency and safety of cutting work. CONSTITUTION:In the wire saw concerned consisting of wire 2 made of metal twisted wire, on the outer periphery of which cutting abrasive grain layer is formed and onto which a large number of cylindrical cutting blades 3 are fitted at fixed intervals, and rubber spacers 4, each of which interposes between the cutting blades 3 and 3 so as to cover the wire 2, the spacer 4 is made of rubber colored except white or black.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire saw used for cutting concrete structures and the like.

[0002]

2. Description of the Related Art In recent years, a cutting method using a wire saw has been attracting attention as a means for cutting and dismantling reinforced concrete structures such as stone materials, buildings and bridges. As shown in FIG. 3, this wire saw is obtained by caulking and fixing a large number of blade bodies 3 to a wire 2 which is a stranded wire of a metal wire at regular intervals, and then, between the blade bodies 3, the blade body 3 is provided. A spacer 9 made of resin or rubber is interposed in order to keep a constant interval and protect the wire 2. The blade body 3 includes a cylindrical sleeve 3a and the sleeve 3a.
And a cutting abrasive grain layer 3b for fixing abrasive grains such as diamond and c-BN fixed by metal bonding or electrodeposition, formed on the outer peripheral portion of the.

By the way, as a recent tendency, as a material of the spacer 9, natural rubber which is excellent in flexibility and adheres tightly to the twisted metal wire is often used. It was revealed that cutting water or seawater used during cutting work penetrates between the stranded metal wire and the spacer or sleeve to corrode the stranded metal wire and cause the wire to be cut. Is. Therefore, the use of resin spacers having inferior flexibility has been limited.

When cutting the cut object 5 such as concrete or stone with the wire saw 1, as shown in FIG. 4, the wire saw 1 is wound around the cut object 5 and endlessly applied with tension. After connecting, the pulley 7 of the drive device 6 is rotationally driven to move the wire saw 1 to 1000 to 180.
Drive at a high speed of 0 m / min. Thereby, the abrasive grain layer 3b of the wire saw 1 slides on the cut surface of the object 5 to be cut. Since the drive device 6 cuts while maintaining the wire saw 1 at a constant tension, it moves backward on the table 8 on which the drive device 6 is installed with respect to the workpiece 5 as the cutting progresses. It is supposed to do.

Such a wire saw has lower noise and vibration than conventional chain saws and circular saws,
In addition, since it is possible to work in a narrow space as long as the wire saw can be run, it is used not only on the ground but also in water when repairing and dismantling concrete structures, etc., and is effective.

[0006]

By the way, since it is necessary to use a suitable type of blade for the wire saw depending on the type of the cut material to be cut, such as stone, concrete, reinforced concrete, and the like. It is common practice to prepare multiple wire saws with different types of blades on site. However, in the past it was difficult to make a reliable visual distinction, and the wrong type of wire saw was often used at the work site, which could significantly reduce the cutting speed and shorten the life of the wire saw. There was a problem of letting it go.

[0007]

Conventionally, carbon black is often added as a reinforcing agent to natural rubber or synthetic rubber, and the appearance of these rubbers is black. Therefore, even when the material composition of the spacer rubber is changed according to the conditions used as the wire saw, it is difficult to judge the type of these rubbers from the appearance.

On the other hand, as a result of various tests conducted by the inventors, instead of carbon black, a rubber material containing a white reinforcing agent was used for the spacer, and a pigment was added to change the color of the spacer. As a result, we have found that it is possible to identify the wire saw at the work place.

The present invention has been made based on the above findings, and is characterized in that the spacer of the wire saw is made of colored rubber other than white or black.

Examples of white reinforcing agents include silicic acid and silicates, surface-treated calcium carbonate, and certain clays. These white reinforcing agents are used alone or in combination for ordinary white rubber. However, if mechanical properties such as wear resistance, tensile strength, tear resistance, etc. are required like the spacer of a wire saw, silicic acid and silicates should be mainly used, especially water resistance. If is necessary, it is preferable to use hydrophobic silicic acid anhydride.

[0011]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that, in the embodiments, the same components as those of the conventional example are designated by the same reference numerals. FIG. 1 is a sectional view showing a wire saw according to an embodiment of the present invention.

The wire saw 10 shown in FIG. 1 has a wire 2 which is a stranded metal wire, and a large number of cylinders which are formed on the outer periphery of the wire 2 and are provided with a cutting abrasive grain layer 3b at regular intervals. The blade body 3 is shaped like a blade, and a rubber spacer 4 that is interposed between the blade bodies 3 and covers the wire 2 is provided.

In this wire saw 10, after fixing the blade body 3 to the wire 2 at equal intervals, an adhesive is applied to the side surface (end surface) of the blade body 3 and the wire 2, and then the following Table 1 is given. It is manufactured by coating a spacer 4 made of rubber having the compounding shown in the above, further placing it in a mold, pressurizing and heating at 145 ° C. for 20 minutes, and vulcanizing and adhering.

(Table 1) Material parts by weight ───────────────── NR 70 SBR high styrene 30 zinc oxide 5 stearic acid 1 silicic anhydride 50 activator 1 softener 10 coloring Material 2 Adhesion accelerator 0.5 Vulcanization accelerator CZ 0.8 Sulfur 4 ───────────────── Total 174.3

The results of measuring the physical properties of the rubber constituting the spacer 4 are shown in Table 2 below, and it was confirmed that the spacer 4 has sufficient characteristics as a spacer for a wire saw.
Further, since the rubber is made by adding a coloring agent (pigment) to a rubber using a white reinforcing agent (anhydrous silicic acid), unlike the conventional rubber using carbon black as a reinforcing agent, The color clearly appears, and the color becomes a color other than white or black (a color determined by the colorant). To give an example of color classification by this colorant, it is red for stone materials, green for concrete, blue for reinforced concrete, and the like. In addition, various colors can be classified according to the hardness and material of the cut object.

(Table 2) 100% tensile stress (Kgf / cm ² ); 18 Tensile strength (Kgf / cm ² ); 230 Elongation (%); 600 Hardness (JISA); 71

According to the wire saw 10 described above, the color of the spacer 4 can be made various by changing the kind of the coloring agent and the blending amount thereof. Then, the wire saw 10 can be easily identified by the color coding of the spacers 4, and the wire saw 10 of an appropriate type can be selected according to the cutting conditions to perform an efficient cutting operation.

Next, another embodiment of the present invention will be described with reference to FIG. The wire saw 11 shown in the figure is similar to the wire saw 10 shown in FIG.
The side surface of the blade body 3 is covered with the inner spacer 12 so as to be substantially flush with the sleeve 3a, and the outer spacer 13 and the inner spacer 1 are provided outside the inner spacer 12.
It is manufactured by vulcanizing and adhering in the same manner as in 2, and covering the outer spacer 13 so that the outer spacer 13 is substantially flush with the abrasive grain layer 3b.

However, the inner spacer 12 is made of rubber having the composition shown in Table 3 below, and carbon black is used as a reinforcing agent. The outer spacer 13 is made of rubber having the composition shown in Table 1 above, and therefore the wire saw 11
The color of the outer spacer 13 is exposed on the surface of the.

(Table 3) Material parts by weight ───────────────── NR 100 parts Zinc oxide 5 parts Stearic acid 1 part Carbon black 60 parts Softener 5 parts Adhesion promoter 0 .7 parts Vulcanization accelerator CZ 0.8 parts Sulfur 4 parts ───────────────── Total 176.5

According to the wire saw 11 having the double spacer structure as described above, the effect of the wire saw shown in FIG. 1 can be obtained, and the abrasive grain layer 3b is worn by the cutting operation. As you go, the outer spacer 1
3 wears out until finally the black inner spacer 12 appears. Therefore, the usage limit of the wire saw 11 can be identified by the change in the color of the spacer, and the wire life, that is, the replacement time can be surely known, so that the work efficiency can be improved and the safety (prevention of breakage accident) can be improved. You can

In each of the above-mentioned embodiments, fluorescent fine powder may be mixed in the spacer colorant. With such a configuration, it is possible to easily confirm the presence of the wire saw itself in the deep sea or in an environment with poor lighting conditions, and it is possible to further improve work efficiency.

[0023]

As described above, in the wire saw of the present invention, a wire which is a stranded metal wire, a cutting abrasive grain layer is formed on the outer periphery, and a large number of wires are fitted on the wire at a constant interval. In a wire saw having a cylindrical blade body and a rubber spacer interposed between these blade bodies and covering the wire, the spacer is made of colored rubber other than white or black. Therefore, the wire saw can be easily identified by the color coding of the spacer portion, and an appropriate type of wire saw can be selected according to the cutting conditions to perform efficient cutting work. The color imparted to the spacer can be variously changed by changing the kind of the colorant and the blending amount thereof.

[Brief description of drawings]

FIG. 1 is a sectional view showing a wire saw according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a wire saw according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a conventional wire saw.

FIG. 4 is a schematic view showing an example of use when performing a cutting operation with a wire saw.

[Explanation of Codes] 2 Wire 3 Blade 4 Spacer 10 Wire Saw 11 Wire Saw 12 Spacer 13 Spacer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hitoshi Hagiwara 348 Showa Rubber Co., Ltd. Kashiwa-shi, Chiba Prefecture Kashiwa Plant

Claims (1)

[Claims] 1. A wire, which is a stranded metal wire, a large number of cylindrical blades having cutting abrasive grain layers formed on the outer periphery thereof and fitted on the wire at regular intervals, and these blades. A wire saw provided with a rubber spacer interposed between and covering the wire, wherein the spacer is made of colored rubber other than white or black.