JPS6146322A - Straightening device of drawn round bar - Google Patents

Abstract

PURPOSE:To remove the internal stress due to a drawing work and to eliminate the change in the wire diameter of a drawing round bar by giving a zigzag deflection to a drawing round bar with rotating a rotary cylinder. CONSTITUTION:A pair of rotary cylinders 1 are provided in series along the feeding axial line C of a drawing round bar A and the rotary cylinders 1 are rotated in reverse direction each other by a rotation driving device 2. Plural grooved straightening bodies 3 are provided inside each rotary cylinder 1 so as to give a zigzag deflection to the drawing round bar A and the projection quantity E of the straightening body 3 is adjusted by an adjusting means 4. Consequently the force removing the internal stress is given with the projection of an internal stress relief straightening body 3 by the rotation of the rotary cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a straightening device for a drawn round bar disposed between a drawing stretching device a and a cutting device Wc.

Kujubei Fujutsu〉 A continuous drawing machine that produces polished round bars by cutting a drawn round bar that has been hollowed out on the cold open side from a coiled material of all attributes and cutting it to the length of the folded shape and performing linear polishing. The internal stress caused by the wire drawing process is removed from the cut round bar that has passed through the iα-ray polishing device, resulting in a thickening of about 0.1 ma+, although this varies depending on the material and processing conditions. In this case, the cut round bars that have been cut enter the linear polishing machine one after another, resulting in a difference in the degree of straightening between the tip, rear end, and center of the cut round bar, which also affects the removal of internal stress. However, there is a difference in the degree of thickening between the central part, where the internal stress has been sufficiently removed, and the end parts, where the internal stress remains, resulting in a difference in wire diameter.

Even if you increase the accuracy of the cutting length and cut to an error that allows you to use both ends, it will still fit the specified line 8! : In order to cut the concave round bar, re-cutting is required, resulting in a large waste of man-hours and materials.

Purpose Therefore, the present invention aims to provide a straightening device that eliminates the internal stress caused by the drawing process and eliminates the change in the diameter of the drawn round bar wire that occurs during the forced polishing process after cutting.

<Example> An elongated circular material that has undergone cold drawing, ie, a drawn round bar, has internal stress in the drawing direction due to plastic deformation during wire drawing. In the case of polyurethane, tensile stress is generated on the surface and compressive stress is generated near the core. If the material is further processed, such as by straightening polishing, this stress will be removed.

Since the polished rod is processed beyond the yield point of the material in the next step, the cross-sectional area of the cut round rod becomes larger and the length of the cut round rod becomes slightly shorter. This current situation is unacceptable, so please correct it! l! Therefore, even if the cutting rod is rolled down to make the wire diameter the same, internal stress must not remain even if the long material is made to have the same diameter. In addition, since the surface of the polishing frame is often used as is, the polishing effect cannot be separated at the same time as straightening.When straightening a cut round bar, no matter which method you use, there will be a difference in the degree of straightening between the ends and the center, and the line diameter le
It appears as t x.

Therefore, an embodiment of the straightening device of the present invention that eliminates the internal stress caused by the drawing process and eliminates the change in the diameter of the drawn round bar wire that occurs during the forced polishing process after cutting is shown in the drawings. Straightening of the drawn round bar A placed between the and the cutting device 5! At the position, a pair of rotations ffJ are carried out in series along the feed #QC of the drawn round bar A.
1 is provided, and a rotary drive device i2 is provided which rotates the rotating round rod 1 in opposite directions to each other. A plurality of (three or more) correction bodies 3 with grooves 3a are provided so as to give a zigzag-like deflection to the rod A,
Between the correction body 3 and the tube 1, there is a protrusion fiE of the correction body 3.
Adjustment means 4 is provided for adjusting.

At both ends of the rotary cylinder 1, there are fixed holes Z having through holes 5a, 6a, and
l15.6c is rotatably supported by the 71z-AF, a pulley 7 is fixed to one end 6, each pulley 7 of each rotation plate part 1, a V belt and a motor that rotate these in opposite directions. Accordingly, two units are configured in the drive w1 unit. The adjusting means 4 includes a correction body push-out bolt 8 screwed onto a horizontal member 1b which is passed over and fixed to the main body 1a of the rotary cylinder 1, and a correction body lifting bolt which is passed through the correction body 3 and penetrated through the horizontal member 1b. 9, and the protrusion fiE of the correction body 3 can be adjusted by rotating both bolts 8 and 9.

Next, to explain the operation, cold drawing is performed in a straight line from a coil-shaped material through a die, and then the rotary cylinder 1 equipped with at least three internal stress-relieving correctors 3 draws the round bar. The round bar A is rotated around A to remove the internal stress generated by wire drawing.Then, the drawn round bar A is fed and cut by a cutting device, and the straight line grinding T! ! It enters the I device, performs 8 cuts on the circular surface of the cut round bar, and is sent out to the 1-product stand. A pair of internal stress relieving layer rotary cylinders 1 are rotated in opposite directions to cancel out the torsion exerted on the drawn round bar. When rotated in this manner, the internal stress relieving corrector 3 has a protrusion ME in the lateral direction and provides a force for relieving internal stress.

In addition, in the present invention, the straightening body 3 includes a drawn round rod Δ
A grooved roller having a protrusion fiE with respect to the feed axis C is adopted, and this roller is supported on the rotary cylinder 1 so as to be rotatable around an axis perpendicular to the feed sleeve AILG, thereby eliminating surface flaws on the drawn round bar A. It may be made of a material that rotates on its own axis and is inclined at a spiral angle to drive on the surface of the long material so as not to cause the occurrence of turbulence, and may be lubricated with oil depending on the material of the drawn round bar A.

Effect> As is clear from the above explanation, the present invention has the advantage of
At the position 51c for straightening the drawn round bar that is disposed between the device and the cutting device, the feeding of the drawn round bar is performed.
A pair of rotary cylinders are provided in series along the line, and a rotation drive device is provided for rotating the rotary cylinders in the opposite direction to the tile.
A plurality of grooved correction bodies are provided so as to give a zigzag-like deflection to the drawn round bar by protruding, and the amount of protrusion of the correction bodies is adjusted between the correction bodies and the rotating cylinder. !
This invention relates to a straightening vc position of a drawn round bar provided with a 4g means.

Therefore, according to the present invention, an excellent effect can be obtained by removing the internal stress caused by the drawing process and eliminating the change in the diameter of the drawn round bar wire that occurs during the forced polishing process after cutting.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the feed axis of a straightening device for a drawn round bar according to an embodiment of the present invention, and FIG. 2 is a sectional view taken in a direction perpendicular to the feed axis. A: Round bar, C: Feed 9 yuzu wire, E: Projection amount, 1: Rotating tube, 2
: Circular pin drive device, 3: Correction body, 3a: Groove, 4: Adjustment means.

Claims (1)

[Claims] In a straightening device for a drawn round bar, which is located between a drawing wire drawing device and a cutting device, a pair of rotating cylinders are provided in series along the feeding flow line of the drawn round bar, and the rotating cylinders are rotated in opposite directions. A rotation drive device is provided for rotating the round rod, and a plurality of grooved straightening bodies are provided in each of the rotary cylinders so as to project with respect to the feed axis of the round rod to give a zigzag-like deflection to the round rod. An adjusting means for adjusting the amount of protrusion of the correcting body is provided between the correcting body and the rotary cylinder, and the diameter of the drawn round bar wire is reduced by removing the internal stress caused by the drawing process and reducing the diameter of the drawn round bar wire generated in the forced polishing process after cutting. A straightening device for a drawn round bar, which is characterized by eliminating changes in the shape of the rod.