JPH08300032A - Device for preventing springback of wire in drum type wire drawing machine - Google Patents

Abstract

PURPOSE: To secure safety of an operator and to improve workability by covering with a material for producing a friction force sufficiently for preventing springback at the time of contact with a wire. CONSTITUTION: With an end of a wire 1 fixed on a drum 4, the drawing of the wire is performed by a rotational force of the drum 4. Since the rotating of the drum 4 stops when the tail end 7 of the wire 1 is passed through a die 3, a cylindrical roll 5 is pushed to a position 8 close to the wire 1 so that the tail end 7 of the wire may not be turned free. As a result, springback coming loose in the axial direction of the wire 1 is stopped by the cylindrical roll 5. With the rotation of the drum 4 stopping, springback also appears in the tail end 7 returning in the axial direction of the wire 1 as indicated by the arrow C. This is prevented by restraining the wire 1 by a friction force between the wire 1 and the cylindrical roll 5. The surface of the cylindrical roll 5 is 'SOLIDUR(R)' covered 11. Consequently, springback of the wire is prevented without causing scratches on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type wire drawing machine, and more particularly, to a safety device at the end of wire drawing or at work.

[0002]

2. Description of the Related Art In a drum type wire drawing machine 10 as shown in FIG. 4, usually, a tip end of a wire rod 1 is made thinner than a die diameter by groove rolls or sanding, and is passed through a die 3, and the die 3 is held in a die holder. After attaching to No. 2, the tip end portion of the wire is fixed to the drum 4 rotating as indicated by arrow A, and the drawing process is performed by the rotating force of the drum 4. If the wire rod 1 is thick or has high hardness and a large drawing force, the tail end of the wire rod 1 is pulled out from the die 3 at the end of the wire drawing, as shown by an arrow B and a dotted line in FIG. The spring back causes the wire rod 1 to unravel like a spring. In such a state, the wire 1 comes into contact with the wire drawing machine parts such as the die holder 3 and the surface of the wire is damaged, so that the worker 16 holds the wire 1 by hand so as not to loosen it on the drum 4. I was working. In such work, there has been a problem in that the pressed wire rod slips and causes hand nicks due to the burr of the wire rod, or the end of the loosened wire rod is hit and injured.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and protects the safety of workers from springback of the wire rod after the completion of wire drawing of the drum type wire drawing machine without damaging the wire rod. The purpose is to Another object of the present invention is to improve the safety and workability of a worker during the wire drawing work of a drum type wire drawing machine.

[0004]

In order to achieve the above object, in a drum type wire drawing machine, a wire rod springback prevention device comprising a cylindrical roll and a moving device for the cylindrical roll is used. The cylindrical roll of this device is movable so as to be close to the wire rod extending between the wire rod drawing drum and the wire drawing die, and when the tail member comes out of the wire drawing die, the tail portion is moved to the die. It is characterized in that it is coated with a material that provides sufficient frictional force to prevent springback in the direction. The springback prevention device is preferably located between the wire rod and the worker during the drawing operation. In this case, whether the position of the worker is the right side or the left side with respect to the traveling direction of the wire rod during the drawing operation is determined by the rotation direction of the drum and the position of the die. Further, it is desirable that the material coated on the surface of the cylindrical roll is solijour, teflon, or urethane. As a result, a sufficient frictional force acts between the wire rod and the surface of the cylindrical roll, and the tail portion of the wire rod can be prevented from returning to the drawing die direction. Furthermore, if two cylindrical rolls are placed on the same carriage and a slide device for sliding the carriage is provided and a wire rod is passed between the two cylinder rolls, not only at the end of wire drawing, but also at the wire drawing. It is possible to improve the safety and workability of workers during work in progress.

[0005]

[Operation] The spring back prevention function of the wire will be described. The wire drawing extends between the wire drawing drum and the wire drawing die, and the wire drawing work is performed by the rotation of the drum.
During the wire drawing work, the cylindrical roll is not used and is placed at the position of the worker. When the wire drawing ends, the wire rod springs back at the moment when the tail of the wire rod comes off the die. In order to prevent this, the cylindrical roll is extruded to a position near the wire drawing so that the tail of the wire does not become free. In this case, the cylindrical roll can be automatically extruded just before the rotation of the drum is stopped. By extruding the cylindrical roll, the wire drawing and the cylindrical roll come into contact with each other at the end of the wire drawing, and the springback in the circumferential direction of the wire rod drawing drum is stopped. Also,
The spring back of the wire rod in its axial direction can be prevented by the frictional force between the wire rod and the cylindrical roll. In order to secure this frictional force, the cylindrical roll is surface-coated.
From the viewpoint of hardness, the material of the surface coating of the cylindrical roll is generally solid. Further, Teflon is suitable for use at high temperatures, and urethane is preferable for wire rods that are easily damaged.

[0006]

[Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. Note that the same numbers are used for the same configurations in each drawing. FIG. 1 is a schematic plan view showing a state in which a wire rod springback prevention device is installed during wire drawing according to an embodiment of the present invention. FIG. 2 is a schematic plan view showing a state in which a wire rod springback prevention device is used at the end of wire drawing according to the embodiment of the present invention. The drum wire drawing machine 10 includes a die holder 2, a die 3 set in the die holder 2,
The drum 4 and a driving device for the drum 4 and other auxiliary equipment (not shown). A wire rod springback prevention device 12 is installed in the drum type wire drawing machine 10. The wire rod springback prevention device 12 includes a rail 9 and a cylindrical roll 5.

The cylindrical roll 5 is on the rail 9 and can be arbitrarily slid by a worker's hand. At this time,
If the frictional force between the cylindrical roll 5 and the rail 9 is sufficiently large so that the force required for sliding is larger than the springback force for wire drawing, the cylindrical roll 5 does not need a stopping means. Although the sliding action is performed by the rail 9 in the first embodiment, a groove may be used instead of the rail 9. That is, it is possible to slide the columnar roll 5 by providing a groove instead of the rail 9 and providing the columnar roll 5 with a convex portion that fits into the groove. In Example 1, gold was used for the wire rod 1 and the surface of the cylindrical roll 5 was coated with solidus 11.

When the wire drawing work is in progress, the wire drawing end is passed through the die 3 and the die 3 is mounted on the die holder 2, as shown in FIG. After that, the end portion of the wire rod 1 is fixed to the drum 4, and the wire rod 1 is pulled out by the rotating force of the drum 4. In this case, the wire 1 is wound on the drum 4. Since the cylindrical roll 5 is not used during this wire drawing work,
It is placed at position 6 on the worker side. At the end of wire drawing, the rotation of the drum 4 is stopped when the tail portion 7 of the wire rod 1 comes out of the die 3 as shown in FIG. 2, so that the cylindrical roll 5 is brought close to the wire rod 1 so that the wire rod tail portion 7 does not become free. Push to position 8. By this work, the spring back, which unwinds the tail portion 7 of the wire 1 in the circumferential direction of the drum 4, is stopped by the cylindrical roll 5. Further, as the rotation of the drum 4 is stopped, the tail portion 7 of the wire rod 1 appears as a spring back returning in the axial direction of the wire rod 1 as shown by an arrow C. However, the friction between the wire 1 and the cylindrical roll 5 causes the wire 1 to be locked,
Axial springback is prevented.

With the springback prevention device 12 of the present invention, it is not necessary to directly hold the tail portion 7 of the wire at the end of wire drawing, so that the burr of the wire does not cause hand cuts and springback. . Therefore, the wire tail portion 7 is not injured, and
Since there is no springback, the operator is released from the risk of injury due to the tail portion 7 of the wire.

[0010]

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. The same numbers are used for the same configurations as those of FIGS. 1 and 2 among the configurations of FIG. FIG. 3 is a schematic plan view of a wire rod according to an embodiment of the present invention when it is used between two cylindrical rolls. In the case of the second embodiment, the drum type wire drawing machine 10 has the same configuration as that of the first embodiment. The wire rod springback prevention device 12 is different from the first embodiment in that the cylindrical roll 5 and the cylindrical roll 15 are provided on the carriage 13 having the same structure, and the carriage 13 slides on the rail 9. In the case of Example 2, the point that the wire 1 is passed between the cylindrical rolls 5 and 15 at the time of work, and that the curve of the wire 1 is pulled toward the worker 16 side by the cylindrical roll 15 and is supported. Different from the first embodiment. The other work is the same as in the first embodiment.

When the wire rod 1 is inserted between the cylindrical rolls 5 and 15, the bending of the wire rod 1 at the time of work can be pulled by the cylindrical roll 15 toward the worker 16 side and supported. Since it is not necessary for 16 to directly press the wire rod 1 by hand, the worker 16 is not only injured after the completion of wire drawing but also due to burrs or the like on the tip end 14 of the wire rod 1 at the time of work. If the column roll 5 and the column roll 15 are placed on the same carriage 13 and the rail 9 is slid, the labor of the worker 16 who moves the column roll 5 close to the wire 1 at the end of wire drawing can be saved. After use, the truck 13 naturally moves on the rail 9 after the weight (not shown) is lowered on the truck 13 or by the force of the spring, so that the operator 6 can move to the position 6
The workability is further improved by returning to. Such a cylindrical roll 5 and a cylindrical roll 15 can be attached as long as there is a space for installing the rail 9 between the die holder 2 and the drum 4. Therefore, it can be easily used in all wire drawing machines having such a structure.

[0012]

Since the present invention is configured as described above, it has the following effects. (1) Springback of the wire can be prevented without causing damage to the wire. As a result, the safety of the worker can be secured and the workability is improved. (2) The wire springback prevention device has a simple structure,
Since the installation space is small, it can be easily installed on all drum wire drawing machines.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a state in which a wire rod springback prevention device is used after wire drawing.

FIG. 2 is a schematic plan view showing a state in which a wire rod springback prevention device is installed during wire drawing.

FIG. 3 is a schematic plan view of a use state when a wire rod is passed between two cylindrical rolls.

FIG. 4 is a schematic plan view showing a springback generated in a tail portion of a wire rod that comes out of a die after drawing.

[Explanation of symbols]

 1 wire rod 2 die holder 3 die 4 drum 5, 15 cylindrical roll 9 rail 10 wire drawing machine 11 coating 12 wire rod springback prevention device 16 worker

Claims (3)

[Claims] 1. A wire rod springback prevention device comprising a cylindrical roll and a moving device for the cylindrical roll, which is combined with a drum wire drawing machine comprising a wire drawing die and a wire rod drawing drum, wherein the cylindrical roll is a wire rod. It is movable so as to be close to the wire rod extending between the drawing drum and the wire drawing die, and when the tail portion of the wire rod coming out of the wire drawing die comes into contact with the tail member, springs back in the wire drawing die direction. A wire rod springback prevention device for a drum type wire drawing machine, characterized in that it is covered with a material that produces sufficient frictional force to prevent it. 2. The wire springback prevention device for a drum type wire drawing machine according to claim 1, wherein the material coated on the surface of the cylindrical roll is solijour, Teflon or urethane. 3. The drum type apparatus according to claim 1, wherein the moving device comprises a dolly, two cylindrical rolls are placed on the same dolly, and a wire is passed between the two cylindrical rolls. Wire spring prevention device for wire drawing machine