KR102243075B1 - Press Apparatus For Springback Correction - Google Patents

Abstract

The present invention relates to a press machine capable of correcting a spring back occurring when a protruding part of a flat ring including a circumference part having a predetermined width, and the protruding part protruding inwards from an inner circumference of the circumference part. The press machine includes: a first lower mold having a first through hole provided in the center; a second lower mold inserted into the first through hole of the first lower mold to be guided, having a second through hole provided in the center, and elastically supported upwards; a plurality of lower molds having a shape made by dividing a cylinder radially, having a first rotary support part provided on an outer circumference of a lower side, and a first expansion guide part provided on an upper side, inserted into the second through hole of the second lower mold, and capable of being rotated around the axis of the rotary support part; a fourth lower mold having a second rotary support part supporting the first rotary support part; a first upper mold inserted between the first, second and third lower molds while pressing the circumference part, bending the protruding part in cooperation with the third lower mold when inserted, having a part coming in contact with the protruding part, which is inclined more than an angle for compensating for a spring back, and having a third through hole provided in the center; a second upper mold inserted into the third through hole of the first upper mold, having a fourth through hole provided in the center and elastically supported downwards; and a third upper mold inserted into the fourth through hole of the second upper mold, and having a second expansion guide part for rotating the third lower mold around the axis of the first rotary support part in cooperation with the expansion guide part of the third lower molds.

Description

Press Apparatus For Springback Correction {Press Apparatus For Springback Correction}

The present invention relates to a press apparatus capable of correcting a spring back, and more particularly, to a press apparatus for bending a sheet material, and to a press apparatus capable of correcting a spring back generated after bending in a bending mold.

In the case of bending by press working, a springback occurs due to plastic deformation, and such springback causes a decrease in the dimensional accuracy of the product.

As disclosed in Korean Patent Registration No. 1728790, in order to correct the springback, there are many cases of performing secondary and tertiary press work by moving the workpiece to a press device in which a correction mold is set after the first press work. Such moving and additional processes of processed products increase the time and cost of production.

On the other hand, as disclosed in Korean Patent Registration No. 1671721, although there are cases where processing is performed at an angle larger than the required angle in consideration of springback, a new type of mold is created whenever processing conditions such as material change or thickness change. There is a necessary problem.

Republic of Korea Patent Registration No. 1537381 proposes a mold capable of adjusting the inclination angle, but since the inclination angle must be adjusted by manually loosening or tightening the bolt, there is a problem that precise adjustment or repetitive implementation is impossible.

KR 10-1728790 B, 2017.04.20., Fig. 1 KR 10-1671721 B, 2016.11.02., Figure 3d KR 10-1537381 B, 2015.07.21., Fig. 7

An object of the present invention is to provide a press device capable of easily and precisely adjusting the correction degree of a springback.

The present invention for achieving the above object,
The circumferential portion 20 of the plate-shaped ring 1 having a circumferential portion 10 having a predetermined width and a plurality of protruding portions 20 protruding inwardly from the inner circumference of the circumferential portion 10 is formed in the circumferential portion 10. In the press device for compensating the springback generated when bending to form a right angle to ),
A first lower mold 110 having a first through hole in the center;
A second lower mold 120 inserted into and guided through a first through hole of the first lower mold 110, having a second through hole in the center, and elastically supported upwards;
A shape obtained by dividing a cylinder radially, and having a first rotational support part 131 formed of a cylindrical surface on a lower outer periphery, and a first expansion guide part 133 formed on an upper side opposite to the outer periphery, and the second lower mold A plurality of third lower molds 130 that are inserted into the second through holes of 120, and the upper side is inclined about the axis of the first rotation support part 131 and pressurizes the protrusion 20, and
A fourth lower mold 140 having a shape corresponding to the first rotation support part 131 and having a second rotation support part 141 supporting the first rotation support part 131;
It is inserted by pressing the circumferential portion 10 between the first, second and third lower molds 110, 120, 130, and when inserted, the protrusion 20 is bent in cooperation with the third lower mold 130, and the protrusion ( 20) a first upper mold 210 having a third through hole in the center and inclined at an angle greater than that capable of compensating the springback;
A second upper mold 220 inserted between the third through holes of the first upper mold 210 and having a fourth through hole in the center and elastically supported downward;

It is inserted into the fourth through hole of the second upper mold 220, and in cooperation with the first expansion guide part 133 of the third lower mold 130, the third lower mold 130 is transferred to the first rotation support part 131 It characterized in that it comprises a;) a third upper mold 230 having a second expansion guide portion 233 for rotating about the axis of).

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It is preferable that a mounting guide part 135 for guiding mounting of the plate-shaped ring 1 is further provided on the upper surface of the third lower mold 130.

It is preferable that at least one of the first and second expansion guide portions 133 and 233 has an inclined surface such that the amount of rotation of the third lower mold 130 increases according to the insertion of the third upper mold 230.

It is also preferable that the third upper mold 230 is vertically operated separately from the first upper mold 210.

The present invention conceived to solve the problems of the prior art as described above can easily and precisely adjust the correction of the springback, there is an effect that can reduce the cost and time required for the production process.

1 is a view showing the shape of a plate-shaped ring to be processed in an embodiment of the present invention.
FIG. 2 is a view showing the shape of a workpiece obtained by bending the plate-shaped ring of FIG. 1;
3, 5 and 6 are diagrams showing one of the operating steps of the mold system according to an embodiment of the present invention.
4 is a view showing the shape of a third lower mold according to an embodiment of the present invention.
Figure 7 is a diagram showing an exaggerated operation relationship of the mold according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings according to the embodiment.

FIG. 1 is a diagram showing the shape of a plate-shaped ring to be processed in this embodiment, and FIG. 2 is a diagram showing the shape of a workpiece made by bending the plate-shaped ring of FIG. 1.

The workpiece of FIG. 2 is an article such as an outer iron inserted into the stator of the torque angle sensor disclosed in Korean Patent Registration No. 10-1681778.

The plate-shaped ring 1 of FIG. 1 includes a circumferential portion 10 having a predetermined width and a protrusion 20 protruding inward from the inner circumference of the circumferential portion 10. Although the plate-shaped ring 1 of this embodiment further includes a locking part 30, the molding of the locking part 30 is not related to the technical idea of the present invention, and thus a description thereof will be omitted.

In order to process the workpiece 1 as shown in FIG. 2 in the plate-shaped ring 1 of FIG. 1, the protrusion 20 and the locking part 30 must be bent. In the present embodiment, the protrusion 20 will be described as an example in which the protrusion 20 is bent to form a right angle with the circumferential portion 10.

In this embodiment, bending is performed by a press device of the type shown in FIG. 3.

The press device of Fig. 3,

A first lower mold 110 having a first through hole in the center;

A second lower mold (120) inserted into and guided by a first through hole of the first lower mold (110), having a second through hole in the center, and elastically supported upwards;

The cylinder is radially divided and includes a first rotation support part 131 on a lower outer periphery and a first expansion guide part 133 on an upper side, and is inserted into a second through hole of the second lower mold, and the A plurality of third lower molds rotatable about the axis of the first rotation support part 131;

A fourth lower mold 140 having a second rotation support part 141 supporting the first rotation support part 131;

It is inserted by pressing the circumferential portion between the first, second, and third lower molds 110, 120, 130, and when inserted, the protrusion is bent in cooperation with the third lower mold, and the portion in contact with the protrusion can compensate for the springback. A first upper mold 210 that is inclined at an angle or more and has a third through-hole in the center;

A second upper mold 220 inserted through the third through-holes of the first upper mold, having a fourth through-hole in the center, and elastically supported downward;

It is inserted into the fourth through hole of the second upper mold 220 and cooperates with the expansion guide part 132 of the third lower mold 130 to rotate the third lower mold around the axis of the first rotation support part. It includes; a third upper mold 230 having a second expansion guide portion 232.

The characteristics and operation relationship of each mold are as follows.

The first lower mold 110 has a first through-hole in its center, and a second lower mold 120 is inserted into the first through-hole. In addition, the inner wall of the first through hole is in contact with the outer wall of the second lower mold 120, and the operation of the second lower mold 120 is guided within the first through hole.

The second lower mold 120 is elastically supported upward by a spring 122 located at the lower side.

The third lower molds 130 are radially arranged and inserted into the second through-hole provided in the center of the second lower mold 120.

The third lower mold 130 has a shape obtained by radially dividing a cylinder. In this embodiment, since there are a total of eight protrusions 20 of the plate-shaped ring 1, the third lower mold has a pie shape divided by 45 degrees on a plan view, and a total of eight are inserted into the second through-hole. The third lower mold 130 having the shape as shown in FIG. 4 is provided with a first rotation support part 131 at a lower outer periphery, and a third rotation support part 131 is provided based on the center of the cylinder forming the outer edge of the first rotation support part 131. The lower mold 130 can be rotated. That is, the upper side of the third lower mold 130 is inclined to the outside. In this case, the inner edge portions 137 of the third lower molds 130 are not shown in the drawing, but have a clearance so that the third lower molds do not interfere with each other. In addition, during rotation, the third lower mold 130, the second lower mold 120, and the first upper mold 210 do not interfere with the second lower mold 120 or the first upper mold 210 to be described later. Of course, it has an optional clearance in ). The first rotation support part 131 is rotatably supported by the second rotation support part 141 of the fourth mold 140 having a corresponding shape.

A mounting guide part 135 is provided on the upper surface of the third lower mold 130 to guide the flat ring of FIG. 1 to be mounted at a predetermined position.

The first upper mold 210 having a third through-hole in the center is inserted between the first, second, and third lower molds 110, 120, and 130 to press the circumferential portion 10 of the flat ring 1. In addition, when it is inserted, the protrusion 20 is bent in cooperation with the third lower mold 130, and the portion in contact with the protrusion 20 is inclined at an angle that can compensate for the springback.

The second upper mold 220 is inserted into the third through hole of the first upper mold 210 and has a fourth through hole in the center. The second upper mold 220 is elastically supported in a downward direction by an elastic support means such as a spring.

The third upper mold 230 is inserted into the fourth through hole of the second upper mold 220, has a second expansion guide part 233 at the tip, and the second expansion guide part 233 is a third lower part. In cooperation with the expansion guide part 133 of the mold 130, the third lower mold 130 is rotated about the axis of the first rotation support part 131.

In this embodiment, the first upper mold 210 and the third upper mold 230 are described as being operated integrally, but the third upper mold 230 may be operated independently.

Hereinafter, each of the molds is operated to perform bending processing and springback correction.

As shown in FIG. 3, after moving the first, second, and third upper molds 210, 220, and 230 upward, the plate-shaped ring 1 is mounted and the first and second lower molds 110 and 120 according to the guide of the guide unit 135 Placed on the top.

Next, as shown in FIG. 5, the first, second, and third upper molds 210, 220, and 230 are moved downward.

Thereafter, as shown in FIG. 6, when the first upper mold 210 and the third upper mold 230 are moved downward, the second lower mold 120 abutting with the first upper mold 210 and the circumference therebetween is also lower. Is moved to. According to this movement, the plate-shaped ring 1 of FIG. 1 is bent and processed into a workpiece as shown in FIG. 2.

7 is an exaggerated view showing that the third lower mold 130 rotates as the third upper mold 230 is inserted to compensate for the springback, and the protrusion is bent more than orthogonal.

The portion (211 in FIG. 7) in contact with the protrusion 20 is inclined at an angle capable of compensating for the springback. This angle may be further inclined, and in this case, the degree of bending of the protrusion may be adjusted by individually adjusting the insertion degree of the third upper mold 230.

1: plate-shaped ring, workpiece 10: circumferential portion 20: protrusion
110: first lower mold 120: second lower mold 122: spring
130: third lower mold 131: first rotation support portion 133: first expansion guide portion
135: mounting guide portion 137: inner corner
140: fourth lower mold 141: second rotation support
210: first upper mold 220: second upper mold
230: 3rd upper mold 233: 2nd expansion guide part

Claims (4)

The circumferential portion 20 of the plate-shaped ring 1 having a circumferential portion 10 having a predetermined width and a plurality of protruding portions 20 protruding inwardly from the inner circumference of the circumferential portion 10 is formed in the circumferential portion 10. In the press device for compensating the springback generated when bending to form a right angle to ),

A first lower mold 110 having a first through hole in the center;

A second lower mold 120 inserted into and guided through a first through hole of the first lower mold 110, having a second through hole in the center, and elastically supported upwards;

A shape obtained by dividing a cylinder radially, and having a first rotational support part 131 formed of a cylindrical surface on a lower outer periphery, and a first expansion guide part 133 formed on an upper side opposite to the outer periphery, and the second lower mold A plurality of third lower molds 130 that are inserted into the second through holes of 120, and the upper side is inclined about the axis of the first rotation support part 131 and pressurizes the protrusion 20, and

A fourth lower mold 140 having a shape corresponding to the first rotation support part 131 and having a second rotation support part 141 supporting the first rotation support part 131;

It is inserted by pressing the circumferential portion 10 between the first, second and third lower molds 110, 120, 130, and when inserted, the protrusion 20 is bent in cooperation with the third lower mold 130, and the protrusion ( 20) a first upper mold 210 having a third through hole in the center and inclined at an angle greater than that capable of compensating the springback;

A second upper mold 220 inserted between the third through holes of the first upper mold 210 and having a fourth through hole in the center and elastically supported downward;

It is inserted into the fourth through hole of the second upper mold 220, and in cooperation with the first expansion guide part 133 of the third lower mold 130, the third lower mold 130 is transferred to the first rotation support part 131 ) A third upper mold (230) having a second expansion guide portion (233) for rotating about the axis of); a press device capable of springback correction, comprising: a.
The method of claim 1,
A press device capable of springback correction, characterized in that a mounting guide part 135 for guiding the mounting of the plate-shaped ring 1 is further provided on the upper surface of the third lower mold 130.
The method of claim 1,
A spring, characterized in that at least one of the first and second expansion guide portions 133 and 233 has an inclined surface to increase the amount of rotation of the third lower mold 130 as the third upper mold 230 is inserted. Press device capable of back correction.
The method of claim 1,
The third upper mold 230 is a press device capable of springback correction, characterized in that the vertical operation independently of the first upper mold 210.

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