JPH0570907U - Wire saw - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the beads 13 from being displaced due to the relative movement between the wire 12 and the spacer 14 during the cutting work by the wire saw 11. [Structure] A rough surface having a surface roughness of 50 to 200 μm is formed on the surface of a wire 12 which is a twisted wire of a metal wire in which beads 13 having a cutting abrasive grain layer 15 are fitted, and between the beads 13 of the wire 12. Then, the spacer 14 is covered by injection molding or the like. As a result, a rough surface corresponding to the rough surface of the wire 12 is formed on the spacer 14, and these rough surfaces engage with each other to generate a large frictional force between them. [Effect] It is possible to solve problems such as a decrease in the cutting efficiency of the wire saw 11 caused by the displacement of the beads 13, excessive wear of the abrasive layer, breakage of the spacer 14, and the like, and the life of the wire saw 11. Can be prevented from being shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wire saw used for cutting stone materials, concrete structures and the like.

[0002]

[Prior 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 and buildings and bridges.

As shown in FIG. 3, this wire saw 1 has a plurality of stranded wires 2 of a plurality of metal wires fitted with a plurality of cylindrical beads 3 at predetermined intervals, and between the beads 3. The spacers 4 are made of a flexible material such as resin or rubber for keeping the intervals of the beads 3 constant and protecting the wires 2. Generally, the spacers 4 are formed by placing the beads 3 on the wire 2 at predetermined intervals and then injection molding the material. Further, an abrasive grain layer 5 for cutting, in which abrasive grains such as diamond and CBN are fixed by metal bonding or electrodeposition, is formed on the outer peripheral portion of the beads 3.

In order to perform cutting with this wire saw 1, as shown in FIG. 4, the wire saw 1 is wound around an object 6 to be connected endlessly, and then attached to a pulley 8 of a drive device 7, The pulley 6 is rotationally driven to run the wire saw 1 at a high speed of 1000 to 1800 m / min to cut the object 6 with the abrasive grain layer 5 of the wire saw 1. The driving device 7 is adapted to retreat on the table 9 on which it is installed with respect to the object 6 to be cut as the cutting progresses.

Such a wire saw has the advantages that the tool weight is light and the noise and vibration are small, and it is performed by cutting stones, hitting, or exploding, which has hitherto relied on a circular saw. It is expected as an alternative to the demolition of concrete structures. In addition, it has many advantages such as the ability to cut and remove underwater structures such as concrete bridge girders and the simultaneous cutting of reinforced concrete, which was previously impossible by using a wire saw. is there.

[0006]

[Problems to be solved by the device]

 However, such a wire saw runs at high speed with a large tension applied as described above during cutting, and the frictional resistance between the object to be cut and the beads and spacers is extremely high. Therefore, a force acts between the wire and the beads and spacers to move them relative to each other in the axial direction of the wire. Here, since the spacer is generally made of a flexible material and therefore has a certain degree of elasticity, when the above-mentioned force acts, the force directly or directly affects the beads. Through the action of the spacers, the spacers are compressed, resulting in a phenomenon in which the spacing between the beads becomes smaller than the spacing at the time when they were originally installed, that is, the beads are displaced.

When the beads are displaced in this way, the initially set intervals of the beads are changed, so that the cutting efficiency of the wire saw is reduced and an abrasive grain layer formed on the outer periphery of the beads is required. It wears out more than that. Also, if the deviation of the beads exceeds the elastic limit of the spacer, the spacer will not return to its original state while being compressed, and in some cases, the spacer will be destroyed and the life of the wire saw itself will be greatly shortened. May occur.

[0008]

[Means for Solving the Problems]

 The present invention has been made to solve such a problem, and has a wire that is a twisted wire of a metal wire and a plurality of wires that have abrasive grain layers for cutting and are fitted to the wire at regular intervals. A cylindrical wire and a flexible spacer interposed between these beads to cover the wire are provided, and the metal wire exposed on the surface of the wire has a surface roughness of 50 to 200 μm. It is characterized in that a rough surface is formed.

As a method of forming such a rough surface, there is a method of corroding excessively, a method of adhering fine particles by plating or the like, and a method of mechanical means, for example, A method of scratching the surface of the wire with a file or a method of sandwiching the wire with a roll having a rough surface can be considered.

[0010]

[Action]

 As described above, since the spacer of the wire saw is generally formed by injection molding, by forming a rough surface on the surface of the wire, the inner peripheral surface of the spacer facing the rough surface is uneven with the rough surface. A reverse surface is formed to have a surface roughness of 50 to 200 μm. Since the surface roughness of the metal wire that composes a normal wire is about 5 to 20 μm, when a spacer shift occurs in a wire saw with such a configuration, the rough surface of the wire surface and the inner circumference of the spacer The rough surface is engaged with each other to generate a frictional force between them, and this frictional force acts in the direction of suppressing the relative movement of the spacer and the wire, so that the displacement of the spacer can be prevented.

[0011]

【Example】

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

The wire saw 11 has a wire 12 that is a twisted wire of a metal wire, a plurality of cylindrical beads 13 that are fitted in the wire 12, and flexibility such as resin and rubber. The spacers 14 are made of a material and are interposed between the beads 13 and cover the wires 12. An abrasive grain layer 15 for cutting is attached to the outer peripheral portion of the beads 13 by attaching abrasive grains such as diamond and CBN by metal bonding or electrodeposition.

A rough surface 16 having a surface roughness of 50 to 200 μm is formed on the metal wire exposed on the surface of the wire 12. In addition, in FIG. 1, the unevenness of the rough surface 16 is shown in an enlarged manner.

Here, in order to form the rough surface 16 on the metal wire on the surface of the wire 12, for example, a method of chemically treating the surface of the wire 12 to corrode it, or plating the wire 12 A method of attaching fine particles by means of, a method of mechanical means, for example, a method of scratching the surface of the wire 12 with a file or the like, or a method of sandwiching it in a roll having a rough surface Be done. It is also possible to obtain the wire 12 having the rough surface 16 on the surface by twisting the metal wire which constitutes the wire 12 in advance after the above-mentioned treatment.

In the wire saw 11 having such a configuration, since the spacer 14 is generally formed by injection molding as described above, the inner surface of the spacer 14 facing the wire 12 has a rough surface 16 and an uneven surface. A rough surface having a surface roughness of 50 to 200 μm is formed at the same time when the spacer 14 is molded.

When a force for moving the wire 12 and the beads 13 and the spacer 14 relative to each other is exerted during the cutting operation by the wire saw 11, the rough surface 16 on the surface of the wire 12 and the inside of the spacer 14 Due to the engagement with the rough surface of the peripheral surface, a remarkably large frictional force is generated between them, compared to the conventional one, and the relative movement of the wire 12 and the spacer 14 is suppressed, so that the displacement of the spacer 14 is prevented beforehand. be able to.

Therefore, according to the wire saw having such a structure, the cutting efficiency of the wire saw is lowered due to the displacement of the beads caused by the relative movement of the wire and the spacer, and the abrasive layer is worn more than necessary. It is possible to solve problems such as breakage of spacers and prevent the life of the wire saw from being shortened.

Next, in order to verify the specific effect of this embodiment, the following experiment was conducted. In this experiment, as shown in FIG. 2, a wire 21 was prepared by forming surface roughness of 50 μm, 100 μm, and 150 μm by knurling on the surface of the wire rope specified in JIS G3535. A cylindrical spacer 22 having a length L of 19 mm and an outer diameter D of 8.5 mm was formed on the mold 21. These are referred to as Experimental Example 1, Experimental Example 2, and Experimental Example 3, respectively. Then, with the spacer 22 fixed, the wire rope 21 was moved in the axial direction at 0.5 mm / sec, and the force required to move the wire rope 21 at this time was measured as the frictional resistance due to the rough surface. Further, as Comparative Examples 1 and 2, similar spacers were formed on ordinary wires having surface roughness of 5 μm and 10 μm, and the same experiment was conducted to measure the friction resistance at this time. Table 1 shows the experimental results of these experimental examples and comparative examples.

[0019]

[Table 1]

From the above results, in Comparative Examples 1 and 2 using a normal wire, the frictional resistance generated between the wire and the spacer is large enough to prevent relative movement between the two when used as a wire saw. However, in the wire saws of Experimental Examples 1, 2 and 3, sufficient frictional resistance is generated between the wire rope and the spacer. It is understood that this makes it possible to prevent the spacer of the wire saw from being displaced.

When the surface roughness of the rough surface formed on the metal wire of the wire surface exceeds 200 μm and becomes large, particularly when the rough surface is formed by corrosion due to chemical treatment or file, etc. It is not preferable because it adversely affects the strength and shortens the life of the wire saw. If the surface roughness of the rough surface is less than 50 μm, a sufficient frictional force for preventing relative movement between the wire and the spacer may not act, which is also not preferable.

[0022]

[Effect of the device]

 As described above, according to the present invention, by forming a rough surface having a surface roughness of 5 to 20 μm on the metal wire exposed on the surface of the wire forming the wire saw, the wire surface is formed on the wire surface when the spacer is formed. A rough surface corresponding to the rough surface is formed on the inner peripheral surface of the facing spacer. When these rough surfaces are engaged with each other, a larger frictional force is generated between them than the conventional force against the force that relatively moves the wire and the spacer during the cutting operation. As a result, the movement of the spacers is suppressed and the beads are prevented from being displaced, so that the cutting efficiency is reduced due to the displacement of the beads, unnecessary abrasion of the abrasive layer, and the spacer destruction caused by this abrasion. It is possible to prevent the life of the wire saw from being significantly shortened.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an experimental method of an experimental example based on the example shown in FIG.

FIG. 3 is a sectional view showing a conventional example according to the present invention.

FIG. 4 is a diagram showing a usage example of a wire saw.

[Explanation of symbols]

 1,11 Wire saw 2,12 Wire 3,13 Beads 4,14 Spacer 5,15 Abrasive grain layer 16 Rough surface

Claims (1)

[Scope of utility model registration request] 1. A wire which is a twisted wire of a metal wire, a plurality of cylindrical beads having an abrasive grain layer for cutting and fitted into the wire at regular intervals, and an interposing between these beads. And a flexible spacer that covers the wire, and the metal wire exposed on the surface of the wire has a surface roughness of 5
A wire saw having a rough surface of 0 to 200 μm formed.