KR101728790B1 - Bending press apparatus for spring back reductionand and method of the same - Google Patents

Bending press apparatus for spring back reductionand and method of the same Download PDF

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KR101728790B1
KR101728790B1 KR1020150130872A KR20150130872A KR101728790B1 KR 101728790 B1 KR101728790 B1 KR 101728790B1 KR 1020150130872 A KR1020150130872 A KR 1020150130872A KR 20150130872 A KR20150130872 A KR 20150130872A KR 101728790 B1 KR101728790 B1 KR 101728790B1
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South Korea
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die
punch
mold
lower die
pad
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KR1020150130872A
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Korean (ko)
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KR20170033049A (en
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박동환
윤재정
문현덕
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재단법인 경북하이브리드부품연구원
(주)조일
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The present invention relates to a mold apparatus capable of correcting a spring back and a mold process using the same, and more particularly, to a transfer mold for processing a sheet track for an automobile in a first process and a second process, The first mold includes a first upper mold die, a first punch coupled to a bottom surface of the first upper die, a first base formed at a lower lower end of the first punch, And a first punch formed between the lower die and the first lower die, wherein the first punch is formed at a side of 90 degrees with respect to a horizontal bottom, the second die has a second upper die, A second punch coupled to a bottom surface of the second upper die and including an inclined surface formed on a side surface thereof, a second base formed at a lower lower end of the second punch, A second die formed between the first and second lower die dies, a second pad formed between the first and second lower die dies, a second pad formed between the first and second lower die dies, and a negative tolerance formed on a side of each second die lower die; And a step of pressing the material to a depth of the bending radius using the second process die.

Figure R1020150130872

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bending press apparatus,

More particularly, the present invention relates to a mold apparatus capable of correcting a spring back selected by the task of the Ministry of Industry and Trade (task No. R0003456), and more particularly, And a mold apparatus capable of correcting the spring back of the molded product by effectively improving the existing mold apparatus effectively and economically and correcting the spring back of the molded product, And a mold process.

As is well known, a bending die in a mold apparatus is used for forming a plate-like steel sheet material into a finished product having a desired shape, and is usually applied to a press apparatus. The bending die is configured such that the material is placed on the upper surface of the pad having a shape corresponding to the contour of the finished product and a predetermined pressure is applied by a punch having a predetermined shape in the upper direction of the pad to bend the material into a desired shape and angle Lt; / RTI >

The bending die is bent at various angles and shapes by using punches, pads, and dies. Since the elasticity of the material can not be completely removed even if a force exceeding the elastic limit or less than the elastic limit is applied to the material, Spring back phenomenon is recovered in which the material is restored to its original state.

The above-mentioned springback phenomenon occurs in the case of a high tensile steel plate, and in the case of a high tensile steel plate material, it is difficult to precisely form a desired shape, resulting in frequent dimensional defects of the product.

In order to prevent the springback phenomenon described above, techniques such as the registration number 10-0517370 and the registration number 10-1545086 are disclosed.

However, registration No. 10-0517370 has a disadvantage in that scratches on the side of the product are largely caused by the processing for preventing springback, and the quality of the finished product is deteriorated. Registration No. 10-1545086 has a very complicated structure, There is a problem in that the efficiency of the mold working is deteriorated because it takes much time to replace the parts when the wear of the component parts due to repetitive springback correction is caused.

Korean Patent No. 10-0517370 Korea Patent No. 10-1545086

It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a mold apparatus which can easily improve an existing mold apparatus and economically correct springback of a molded product, And to provide a mold apparatus capable of correcting the spring back which improves the efficiency and a mold process using the same.

The present invention also provides a mold apparatus capable of correcting a spring back which can produce a finished product of a high quality by minimizing the scratch of a finished product, and a mold process using the mold apparatus.

The problems to be solved by the present invention are not limited to the above-mentioned problems. It is to be understood by those skilled in the art that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

The present invention provides a transfer mold for processing a sheet track for an automobile in a first step and a second step in which a high-strength steel sheet material having a predetermined thickness is sequentially moved, wherein the first step mold has a first upper mold die, A first punch coupled to a bottom surface of the first die, a first base formed on a lower side of a lower side of the first punch, a first lower die formed on both sides of the first base, Wherein the first punch has a side surface formed at 90 degrees with respect to a horizontal bottom, the second process die has a second upper mold die and a second upper mold die coupled to a bottom surface of the second upper mold die, A second base formed on both sides of the second base, and a second base formed on both sides of the second base, the second base formed on both sides of the second base, A second pad formed thereon, and a negative tolerance formed on each second lower die die side.

The mold process according to the present invention includes the steps of firstly bending a material using a first process die and pressing the material to a depth of a bending radius using a second process die.

The present invention has the effect of forming the side surface of the second punch as an inclined surface and forming a minus tolerance so that the material can be bent into an accurate shape even if a springback phenomenon occurs in the material after the completion of the second mold working.

Further, according to the present invention, as a simple operation of exchanging the second punch, the second lower die and the second pad, when a force of 1 Newton per 1 square meter acts as a SI derived unit of MPa (Mega Pascal: It is possible to simplify the springback calibration according to the pressure of the gas.

1 is a front view showing an embodiment of the present invention.
2 is a partially enlarged front view of a second process die of the present invention.
3 is an enlarged view of a used state part of the second process die.
4 is a block diagram illustrating a mold process according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The known configurations and their associated operations are omitted or briefly described, and the size of each element or a specific portion constituting the element in the drawings may be exaggerated, omitted, or schematically shown for convenience and clarity of description .

1 is a front view showing an embodiment according to the present invention.

As shown in the figure, the present invention is a transfer mold for bending and producing an automotive seat track with a 980 MPa high tensile strength steel sheet having a constant thickness, and includes a first process die 100 and a second process die 200.

The first mold 100 includes a first upper mold die 110, a first punch 120 coupled to a bottom surface of the first upper mold die 110, A first lower die 140 formed on both sides of the first base 130 and a first pad 150 formed between the both first lower die 140, .

The first upper die 110 is connected to a vertically reciprocating operation mechanism (not shown) and moves up and down to perform a press action. The first punch 120 is coupled to the bottom surface of the first upper die 110. The first punch 120 is formed at an angle of 90 degrees with respect to the horizontal bottom surface, with the bottom surface being parallel to the ground.

A first base 130 is formed in a lower direction of the first punch 120. A first lower die 140 is formed on both sides of the upper surface of the first base 130 and a first pad 150 is formed between the first lower die 140.

Both side surfaces of the first pad 150 and the first lower die 140 are configured to abut against each other with no tolerance. A shock absorber (not shown) such as a gas spring is formed on the bottom surface of the first base 130.

The second process die 200 includes a second upper mold die 210 and a second punch 220 coupled to a bottom surface of the second upper die 210 and including a side slope 221, A second lower die 230 formed on the lower side of the second punch 220 and a second lower die 240 formed on both sides of the second base 230; And a negative tolerance 260 formed on one side of each of the second lower dies 240 on both sides.

The second image forming die 210 is connected to a vertical reciprocating operation mechanism (not shown) and moves up and down to perform a press action. A second punch 220 is coupled to the bottom of the second upper die 210. The second punch 220 includes a sloped surface 221 having a bottom surface parallel to the ground surface, and both sides of the second punch surface 220 having a wide lower portion and a narrow upper portion with respect to a horizontal bottom.

And a second base 230 is formed in a lower direction of the second punch 220. A second lower mold die 240 is formed on both sides of the upper surface of the second base 230 and a second pad 250 is formed between the lower molds 240.

Both side surfaces of the second pad 250 and the second lower die 240 are configured to abut. A shock absorber (not shown) such as a gas spring is formed on the bottom surface of the second base 230.

2 is a partially enlarged front view of a second process die of the present invention.

Referring to the drawings, the second punch 220 includes an inclined surface. The inclined surface 221 is one of 2 ° to 8 °. The inclined surface 221 is selected according to the MPa of the high-strength steel plate used as the material, and the angle of the inclined surface 221 of the second punch 220 increases as the MPa value of the high-strength steel plate increases.

The increase in the MPa value of the high-strength steel plate and the increase in the angle of the slope 221 increase with the increase in the MPa value of the high-strength steel plate.

As shown, a negative tolerance 260 is formed on one side of each second lower die 240. The one side surface is a portion where the second lower die 240 contacts the second pad 250. The minus tolerance 260 is formed by extending one side of the second lower die 240 in the direction of the second pad 250. The width of the second pad 250 is narrowed corresponding to the width of the second lower die 240 being extended by one side.

The minus tolerance 260 is selected depending on the MPa of the high-strength steel plate used as the material, and the width of the minus tolerance 260 increases as the MPa value of the high-strength steel plate increases.

3 is an enlarged view of a used state part of the second process die.

3, the negative tolerance 260 of the present invention is formed by enlarging the width of the second lower die 240 in the direction of the second pad 250 from the first lower die side wall position 270 shown in the drawing. The first lower die sidewall position 270 shown in FIG. 3 shows the thickness of the material at the outermost side position of the first punch on the drawing of the second process die 200 to help understand the negative tolerance 260 And a virtual line indicating a distance to be added.

The material 300 that has undergone the primary bending in the first-step mold is tilted on both sides by the springback phenomenon. As described above, the material of which the first bending is completed is placed on the upper surface of the second pad of the second process die 200 and enters the secondary bend.

The side outer side of the first material 300 bent by the second punch 220 moving in the downward direction comes into contact with the side surface of the second lower die 240 and is bent. The second pads 250 having a larger width in the bending process push the side surfaces of the work 300 and work so that the work is easily bent at an angle corresponding to the slope 221 of the second punch 220.

The side surface of the work 300 is bent at the same angle as the inclined surface 221 of the second punch 220 in a state in which the second punch 220 is moved in the downward direction. In the bending process, the second punch 220 moves downward by the depth of the bending radius R formed by the bottom surface and the side surface of the second punch. That is, when the bending radius R is formed to be 10 mm, the descent depth of the second punch 220 is 10 mm.

The lowering depth of the second punch 220 is set to a depth of the bending radius R to minimize the scratch of the finished product due to the friction between the side surface of the work 300 and the second lower die 240, So as to bend the side surface of the work by an angle of the inclined surface 221.

4 is a block diagram illustrating a mold process according to an embodiment of the present invention.

A first step (S100) of bending a material using a first process metal mold; a second process (S200) of pressing a material to a depth of a bending radius using a second metal mold; .

The first step of first bending the material using the first step mold (S100): The prepared 980 MPa material having a constant thickness is pressed by the first punch and is firstly bent. The material that has undergone the first bending operation is formed by the springback phenomenon at an angle which is not orthogonal to the bottom surface and side of the material but spreads in both outward directions. This is because the bottom and sides of the first punch are formed at right angles, and the springback phenomenon occurs in the material in which the first bending is completed.

Since the first step (S100) using the first process metal mold is a bending process using a conventional press, a detailed description of the first step process will be omitted.

Second Step S200: Pressing the material to a depth of the bending radius using the second step mold (S200): The material whose first bending is completed by the first step mold is secondarily bent in the second step mold. The second punch is lowered to the depth of the bending radius formed by the bottom surface and the side surface of the first bent material, and presses the material. For example, if the bending radius is 10 mm, the descent depth of the second punch is 10 mm.

When the second punch is lowered as described above, the second lower die, which is widened in the direction of the second pad due to the negative tolerance, presses the side surface of the work so that the workpiece is easily bent at an angle corresponding to the inclined surface of the second punch .

Also, the depth of descent of the second punch set to the bending radius minimizes the scratches of the finished product that are generated as the side of the work is scratched on the second lower die.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as set forth in the following claims. Should belong to the scope of claims of the attached patent registration.

100: first process die 110: first phase die
120: first punch 130: first base
140: first lower die 150: first pad
200: second process die 210: second phase die
220: second punch 221: sloped surface
230: second base 240: second lower die
250: second pad 260: negative tolerance
270: first lower die die side wall position 300: material

Claims (4)

1. A transfer mold comprising a first process mold (100) and a second process mold (200) for bending an automotive seat track with a 980 MPa high tensile strength steel sheet having a predetermined thickness,
The first mold 100 includes a first upper mold die 110, a first punch 120 coupled to a bottom surface of the first upper mold die 110, A first lower die 140 formed on both sides of the first base 130 and a first pad 150 formed between the both first lower die 140, Wherein the first punch 120 has a side surface formed at 90 degrees with respect to a horizontal bottom,
The second process die 200 includes a second upper mold die 210 and an inclined surface 221 coupled to the bottom surface of the second upper die 210 and formed at an angle of 2 to 8 degrees A second base 230 formed on the lower side of the lower side of the second punch 220, a second lower die 240 formed on both sides of the second base 230, A second pad 250 formed between the second lower die 240 and a negative tolerance 260 formed on a side of each second lower die 240, The lower die 240 is formed by extending one side of the lower die 240 in the direction of the second pad 250 and the width of the second pad 250 corresponding to the width of the second lower die 240, Is narrowed and formed,
Wherein the second die (200) is configured to press the second punch (200) by the bending radius of the lower bent portion of the blank when pressing the second punch (200).
In a mold process of a transfer mold including a first process mold 100 and a second process mold 200, the automobile seat track is produced by bending a 980 MPa high tensile strength steel sheet having a constant thickness.
A first punch 120 coupled to a bottom surface of the first upper die 110 and a second base 130 formed at a lower end of the first punch 120, , A first lower die (140) formed on both sides of the first base (130), and a first pad (150) formed between the both first lower die (140), the first punch A first step S100 of bending a material by using a first process die having side surfaces formed at 90 degrees with respect to a horizontal bottom;
A second punch 220 including an upper second die 210 and an inclined surface 221 coupled to a bottom surface of the second upper die 210 and formed at an angle between 2 [deg.] And 8 [deg. A second lower die 230 formed on the lower side of the second punch 220 and a second lower die 230 formed on both sides of the second base 230; And a negative tolerance 260 formed on a side of each second lower die die, wherein the negative tolerance 260 is defined by one side of the second lower die 240 facing the second The second lower die 240 is formed to extend in the direction of the pad 250 and the width of the second pad 250 is narrowed to correspond to the width of the second lower die 240. As a result, And a second step (S200) of pressing the material to a depth of the bending radius. Bending method using a die.
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KR1020150130872A 2015-09-16 2015-09-16 Bending press apparatus for spring back reductionand and method of the same KR101728790B1 (en)

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KR102243075B1 (en) 2019-11-12 2021-04-21 서연이엔지 주식회사 Press Apparatus For Springback Correction

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CN109013814B (en) * 2018-09-17 2023-08-01 桂林电子科技大学 Transverse rebound suppression device in wave-shaped sheet forming process
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CN110538924B (en) * 2019-09-27 2024-05-03 深圳数码模汽车技术有限公司 Convex rib die for side plate part of automobile seat and processing method thereof
CN115365387B (en) * 2022-08-17 2024-06-25 九牧厨卫股份有限公司 Bending die and bending method thereof
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Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
KR100517370B1 (en) 2003-12-29 2005-09-27 주식회사 포스코 Bending press apparatus for preventing spring back
KR101545086B1 (en) 2014-04-08 2015-08-17 (주)위텍 Press mold for bending machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102243075B1 (en) 2019-11-12 2021-04-21 서연이엔지 주식회사 Press Apparatus For Springback Correction

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