JPH0416250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a continuous drawing machine for drawn round bars, which is equipped with a drawing device, a cutting device, a straightening device, and a polishing device.

<Prior Art> In a conventional continuous drawing machine, as shown in FIG. 4, a coiled metallic material 21 is pre-straightened in a pre-straightening device 22, and then cold drawn in a wire drawing device 23 to be drawn. It is made into a round bar, passed through the driving part 24, straightened by the straightening device 25, then cut into a desired length by the cutting device 26, and then cut into the intermediate guide 27.
The wire is then straightened and polished by a straight line polishing device 28, received by a wire holder 29, and made into a polished round bar.

As shown in FIG. 5, the straightening device 25 is composed of a plurality of straightening rollers 30 rotating around a horizontal axis and a plurality of straightening rollers 31 rotating around a vertical axis.

Generally, a long 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 many cases, tensile stress is generated on the surface and compressive stress is generated near the core. Therefore, the material is further straightened and the surface polished to remove internal stress.

If the round bar is sent to the next process without sufficiently removing its internal stress, the polished round bar will be processed beyond the yield point of the material in the next process, so the cross-sectional area of the cut round bar will increase and the length of the cut bar will increase. The length becomes slightly shorter, which is not desirable. Therefore, the internal stress must be removed by thorough correction and polishing.

<Problems to be Solved by the Invention> However, in the above-mentioned prior art, internal stress due to wire drawing is removed when the cut round bar is passed through a linear polishing device for straightening and polishing, but depending on the material processing conditions, There was a problem with the large size being about 0.1mm thicker.

In particular, in this case, the cut round rods that have been cut enter the linear polishing device one after another, so there is a difference in the degree of straightening between the tip and rear ends of the cut round rod and the center, which eliminates internal stress. It also affects. Therefore,
There is a problem in that there is a difference in the degree of thickness between the central portion, where the internal stress has been sufficiently removed, and the end portions, where the internal stress remains, resulting in a difference in wire diameter.

That is, when straightening a cut round bar, no matter which method is used, there is a problem in that there is a difference in the degree of straightening between both ends and the center, which results in an error in the wire diameter.

In the above case, even if you increase the accuracy of the cutting length and cut to a usable error to both ends, you will have to re-cut the wire to make a cut round bar within the specified wire diameter range, which will require additional man-hours and materials. A problem arose when the amount of waste increased.

In view of the above, an object of the present invention is to provide a continuous drawing machine that eliminates internal stress caused by drawing and eliminates changes in the wire diameter of a drawn round bar that occur during the forced polishing process after cutting.

<Means for solving the problem> The means for solving the problem according to the present invention are as follows:
As shown in the figure, a wire drawing device 13 performs cold drawing on a metallic material to form a drawn round bar A, and a cutting device 14 cuts the drawn material into a desired length.
A straightening device 16 includes a polishing device 15 that polishes the cut material, and a straightening device 16 that straightens the drawn material.
The straightening device 16 is disposed between the wire drawing device 13 and the cutting device 14, and the straightening device 16 is provided with a pair of rotating cylinders 1 in series along the feeding axis C of the drawn round bar A.
A rotation drive device 2 for rotating the rotary cylinders 1 in mutually opposite directions is provided, and in each of the rotary cylinders 1, a zigzag shape is provided on the drawable round bar A by protruding with respect to the feed axis C of the drawn round bar A. A plurality of correcting bodies 3 with grooves 3a are provided so as to give deflection, and an adjusting means 4 for adjusting the protrusion amount E of the correcting bodies 3 is provided between the correcting bodies 3 and the rotary cylinder 1. be.

<Operation> In the above-mentioned problem solving means, the material is cold drawn in a straight line through the die of the wire drawing device 13, and then the material is rotated using at least three straighteners 3 for relieving internal stress. The cylinder 1 rotates around the drawn rod A to remove internal stress generated by wire drawing. Next, the drawn round bar A is fed and cut by a cutting device 14, and enters a polishing device 15, where the circular surface of the cut round bar is polished.

That is, by rotationally correcting the wire with the straightening device 16 before cutting, only polishing is performed with the polishing device 15, so that changes in the wire diameter of the drawn round bar that occur during the polishing process after cutting can be eliminated.

Furthermore, if straightening is performed before cutting, there is a risk that the drawn round bar may be twisted due to friction caused by the straightening body between the wire drawing device and the straightening device. Since it rotates in the opposite direction, the twisting force applied to the round rod A is offset.

The correction body 3 has a protrusion amount E in the lateral direction and provides a force for removing internal stress.

<Example> An example of a continuous drawing machine according to the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 3, the continuous drawing machine according to the present invention includes a pre-straightening device 12 for pre-straightening a coiled metallic material, and a drawing machine for cold drawing the pre-straightened material into a drawn round bar. A wire device 13 and a cutting device 1 that cuts the drawn material into a desired length.
4, and a polishing device 15 for polishing the cut material, and a straightening device 16 for straightening the drawn material.
is placed between the wire drawing device 13 and the cutting device 14.

In FIG. 3, reference numeral 17 is a driving unit, 18 is an intermediate guide, and 19 is a wire holder, the structure and arrangement of which are the same as those of the conventional one shown in FIG. 4.

The straightening device 16 for the drawn round bar A is provided with a pair of rotary cylinders 1 in series along the feed axis C of the drawn round bar A, and a rotation drive device 2 for rotating the rotary cylinders 1 in mutually opposite directions. A plurality of (three or more) grooves 3a are provided in each rotary cylinder 1 so as to project with respect to the feed axis C of the round rod A to give the round rod A a zigzag deflection.
An attached correction body 3 is provided, and an adjustment means 4 for adjusting the protrusion amount E of the correction body 3 is provided between the correction body 3 and the rotary cylinder 1.

End tubes 5 and 6 having through holes 5a and 6a are fixed to both ends of the rotating tube 1, the end surfaces 5 and 6 are rotatably supported by a frame F, and a pulley 7 is fixed to one end tube 6. The drive device 2 is constituted by each pulley 7 of each rotary tube 1, a V-belt for rotating these in opposite directions, and a motor. 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. Consisting of 9 and
By rotating both bolts 8 and 9, the amount of protrusion E of the correction body 3 is
can be adjusted.

Further, the configurations of the preliminary straightening device 12, the wire drawing device 13, and the cutting device 14 are similar to those of the conventional device shown in FIG.

Further, the polishing device 15 differs from the conventional one shown in FIG. 4 in that it performs only polishing without straightening.

Next, to explain the operation, the coiled material is cold drawn in a straight line through the die of the wire drawing device 13, and then rotated with at least three correction bodies 3 for relieving internal stress. The cylinder 1 rotates around the drawn rod A to remove internal stress generated by wire drawing. Next, the drawn round bar A is fed and cut by the cutting device 14, enters the polishing device 15 from the intermediate guide 18, polishes the circular surface of the cut round bar, and is sent to the wire holder 19.

That is, by rotationally correcting the wire with the straightening device 16 before cutting, only polishing is performed with the polishing device 15, so that changes in the wire diameter of the drawn round bar that occur during the polishing process after cutting can be eliminated.

A pair of rotary cylinders 1 for relieving internal stress are rotated in opposite directions to cancel out the torsion exerted on the round bar A. When rotated in this manner, the corrector 3 for relieving internal stress has a protrusion amount E in the lateral direction and provides a force for relieving internal stress.

In addition, in the present invention, a grooved roller having a protrusion amount E with respect to the feed axis C of the drawn round bar A is adopted as the correction body 3, and this roller is rotatable around an axis perpendicular to the feed axis C. By supporting it on the rotary tube 1, the drawn round bar A can be rotated on its own axis and tilted to a spiral angle rolling on the surface of the long material so as not to cause surface flaws, and the material of the drawn round bar A is It may also be possible to provide oil lubrication.

<Effects of the Invention> As is clear from the above description, according to the present invention, the straightening device is disposed between the wire drawing device and the cutting device, and the straightening device rotationally straightens the wire before cutting. Since only polishing is performed in this method, it is possible to eliminate changes in the wire diameter of the drawn round bar that occur during the polishing process after cutting.

Furthermore, if straightening is performed before cutting, there is a risk that the drawn round bar may be twisted due to friction caused by the straightening body between the wire drawing device and the straightening device. Because they rotate in opposite directions, they have the excellent effect of canceling out the twisting that is applied to the drawn round bar.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the feed axis of a straightening device for drawn round bars according to an embodiment of the present invention, FIG. 2 is a sectional view taken in a direction perpendicular to the feed axis, and FIG. 3 is a continuous drawing machine according to the present invention. FIG. 4 is a layout diagram of a conventional continuous drawing machine, and FIG. 5 is a configuration diagram of the straightening device. A: Round bar, C: Feed axis, E: Projection amount, 1: Rotating cylinder, 2: Rotary drive device, 3: Correction body, 3a:
groove, 4: adjustment means, 12: preliminary correction device, 13:
Wire drawing device, 14: Cutting device, 15: Polishing device, 1
6: Straightening device, 17: Driving unit, 18: Intermediate guide, 19: Line pedestal.

Claims (1)

[Claims] 1. A wire drawing device 13 that performs cold drawing on a metallic material to form a drawn round bar A, a cutting device 14 that cuts the drawn material into a desired length, and a polishing device that polishes the cut material. 15, a straightening device 16 for straightening the drawn material is arranged between the wire drawing device 13 and the cutting device 14. A pair of rotating cylinders 1 are provided in series, and the rotating cylinders 1
A rotary drive device 2 is provided for rotating the round rods in opposite directions, and a rotary drive device 2 is provided in each of the rotary cylinders 1 so as to give a zigzag-like deflection to the round rod A by protruding from the feed axis C of the round rod A. A continuous correction body characterized in that a plurality of correction bodies 3 with grooves 3a are provided, and an adjustment means 4 for adjusting the protrusion amount E of the correction bodies 3 is provided between the correction bodies 3 and the rotary cylinder 1. drawing machine.