KR101869898B1 - Manufacturing mold of torsion beam - Google Patents

Manufacturing mold of torsion beam Download PDF

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Publication number
KR101869898B1
KR101869898B1 KR1020170010841A KR20170010841A KR101869898B1 KR 101869898 B1 KR101869898 B1 KR 101869898B1 KR 1020170010841 A KR1020170010841 A KR 1020170010841A KR 20170010841 A KR20170010841 A KR 20170010841A KR 101869898 B1 KR101869898 B1 KR 101869898B1
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KR
South Korea
Prior art keywords
torsion beam
point
shape
cross
mold
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Application number
KR1020170010841A
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Korean (ko)
Inventor
이선호
전성호
우종훈
Original Assignee
(주)동희산업
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Priority to KR1020170010841A priority Critical patent/KR101869898B1/en
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Publication of KR101869898B1 publication Critical patent/KR101869898B1/en

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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
    • B21D37/10—Die sets; Pillar guides
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G9/00—Resilient suspensions of a rigid axle or axle housing for two or more wheels
    • B60G9/04—Resilient suspensions of a rigid axle or axle housing for two or more wheels the axle or housing not being pivotally mounted on the vehicle

Abstract

The torsion beam forming mold according to the present invention is formed by cold forming from a pipe-shaped base material, and has a U-shaped or V-shaped central portion that is joined to the trailing arm and has a rectangular cross- And a transition portion having a shape gradually changing from a square to a U-shape or a V-shape as the cross-sectional shape is gradually increased from both ends to the central portion, wherein a cavity formed between the cold-formed torsion beam and the cold- And an upper mold and a lower mold that are U-shaped or V-shaped in shape more concave than the cross-sectional shape of the center portion and the transition portion.

Description

{MANUFACTURING MOLD OF TORSION BEAM}

The present invention relates to a mold for manufacturing a torsion beam, which is formed to mold a high-strength torsion beam and to take into account a restoration amount by spring back.

BACKGROUND OF THE INVENTION [0002] A suspension system of a vehicle typically serves to prevent vibrations and shocks continuously generated from a road surface while a vehicle is running from being transmitted to a frame through wheels and axles. A stamping type and a tube type torsion beam axle (hereinafter referred to as CTBA: Coupled Torsion Beam Axle) type are mainly used as a suspension device of a vehicle for such a function. However, in the case of the stamping type, there are a large number of parts, so there are many welding parts for assembling and there is a problem in that the deformation of the welding part is increased. On the other hand, CTBA has advantages such as weight reduction and part count reduction by omission of torsion bar. As a result, the use of CTBA has been increasing recently, and research and technology development is ongoing.

In recent years, as the demand for the tubular CTBA increases, a torsion beam having a certain strength or more is required to improve the rigidity and durability life. The demand for high strength and high durability of such a torsion beam is expected to expand gradually.

Generally, in order to ensure moldability and strength, CTBA first cold-formed low-strength pipes and then heat-treated to increase strength. However, according to this fabrication method, a heat treatment process is added to the torsion beam production, which increases the time and cost of fabrication. However, it is very difficult to design a torsion beam of a desired shape by a designer because the pipe has low formability for cold forming a high strength pipe without heat treatment.

That is, the high-strength pipe is cold-formed when the upper mold and the lower mold are pressed toward each other. When the pressure is removed, a spring back phenomenon occurs in which the bending amount of the high- Lt; / RTI > According to such a spring back phenomenon, the designer can not manufacture a torsion beam having a desired shape, which leads to a problem that the torsion beam is deteriorated in merchantability.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-0797370 B1

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a torsion beam forming apparatus and a method of manufacturing a torsion beam by cold- Which is capable of manufacturing a torsion beam of a torsion beam.

According to an aspect of the present invention, there is provided a torsion beam forming mold comprising a tubular base material formed by cold forming, a torsion beam forming mold coupled to the trailing arm, And a transition portion that is formed between both ends and the center portion and has a cross-sectional shape that gradually changes from a square to a U-shape or a V-shape gradually from both ends to a central portion. The mold is a mold for forming a torsion beam And an upper mold and a lower mold which are U-shaped or V-shaped more concave than the central portion and the transition section of the additional cold-formed torsion beam.

The torsion beam is constituted by a concave portion which is a bent portion at the center side and a straight portion which is a straight line portion extending from both sides from the concave portion and an inferring portion which is bent at both sides from the straight portion, And the upper mold and the lower mold are formed such that the base material is cold-formed at a point where the cavity is spaced apart from the rectilinear portion of the torsion beam by a predetermined angle.

The setting angle may be a point at which the reference point is connected to the concave portion and the straight line portion of the torsion beam.

The set angle gradually increases as the bending restoration amount of the torsion beam is nearest to the point where the torsion beam is restored by the spring back with respect to the longitudinal direction of the torsion beam.

The setting angle is set so as to gradually increase until reaching a maximum correction point spaced a predetermined distance from the one end of the transition portion connected to both ends, and to gradually decrease from the maximum correction point until reaching the center portion.

And the maximum correction point is a point spaced apart by three quarters of the distance between both ends and the center portion with respect to both ends.

The upper mold and the lower mold may be formed such that the cavity is formed to have the same cross-sectional shape as the end portions of the torsion beam up to a predetermined distance toward the center with respect to both ends.

The torsion beam may be characterized by a high strength steel having a strength of 80 kgf / mm 2 (780 MPa) or more.

According to the mold for manufacturing a torsion beam having the above-described structure, even if the base material of the torsion beam is a high-strength steel material, the ease of manufacturing the bar torsion beam that can realize a torsion beam having a shape required by the designer can be improved.

FIG. 1 is a perspective view showing a torsion beam according to an embodiment of the present invention, FIG.
FIG. 2 is a cross-sectional view taken along line A-A 'of FIG. 1,
FIG. 3 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing a cross section taken along the line B-B 'in FIG. 1;
FIG. 4 is a cross-sectional view illustrating a torsion beam forming mold shape for manufacturing the C-C 'section of FIG. 1;
FIG. 5 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing a cross section taken along the line D-D 'in FIG. 1;
FIG. 6 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing the section E-E 'of FIG. 1;
7 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing a cross section taken along the line F-F 'in FIG.

Hereinafter, a mold for manufacturing a torsion beam according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a torsion beam according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A 'in FIG. 1, FIG. 4 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing a cross-section taken along line C-C 'of FIG. 1, and FIG. 5 is a cross-sectional view showing a torsion beam forming mold Fig. 6 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing the section of E-E 'in Fig. 1, and Fig. 7 is a cross-sectional view showing a torsion beam forming mold shape for manufacturing the F- Fig.

Referring to FIGS. 1 to 7, the torsion beam forming molds 10 and 20 of the present invention are formed by cold forming from a pipe-shaped base material and have both ends, which are joined to the trailing arm and have a square cross- A U-shaped or V-shaped central portion, and a transition portion, which is provided between both end portions and a central portion and has a cross-sectional shape gradually changing from a square to a U-shape or V-shape gradually from both ends to a central portion, The hollow portion 30 formed between the upper mold 10 and the lower mold 20 has a U-shape or a V-shape that is more concave than the central portion of the cold-formed torsion beam 1 and the cross- ; ≪ / RTI >

The torsion beam 1 may be characterized by being a high strength steel having a strength of 80 kgf / mm 2 (780 MPa) or more.

Generally, the higher the strength of the material, the stronger the force to restore it to the original shape when the external force is applied and released. When cold forming is performed by applying pressure to the base material of such a high strength steel material, there is a problem that the base material is spring back due to the bending restoring force and it is difficult to realize the torsion beam target shape required by the designer.

The present invention relates to a torsion beam forming apparatus in which the upper mold 10 and the lower mold 20, which are torsion beam forming molds, are formed so as to apply a correction value for spring back, that is, And is formed so as to form a V-shaped cavity 30.

A protrusion 13 protruding downward is formed on the lower end face of the upper mold 10 of the present invention and a recessed recess 13 is formed on the upper end face of the lower mold 20 in a position corresponding to the protrusion 13. [ The base material 23 is formed so that the base material is placed on the lower mold 20 and then the upper mold 10 and the lower mold 20 are pressed in the direction of approaching each other to perform cold forming of the torsion beam 1. [

1 to 7, both ends of the torsion beam 1 have a square cross-sectional shape and are formed to have a U-shape or a V-shape toward the center. The torsion beam 1, The correction value for the spring back will be applied differently depending on the longitudinal direction of the spring.

As shown in FIG. 3, since both end portions of the torsion beam 1 are cold-formed in a square shape in cross section, it is not necessary to separately apply a correction value in preparation for a spring back phenomenon.

4 to 7, since the cross-sectional shape of the central portion and the transition portion of the torsion beam 1 is a U-shaped or V-shaped, or a shape gradually changing from a square to a U or V shape, When the pressure applied by the upper mold 10 and the lower mold 20 is released, a bending restoration amount is generated and a spring back phenomenon will occur.

4 to 7, the dashed line indicates the shape of the torsion beam 1 in the state where the pressure of the upper mold 10 and the lower mold 20 is applied, the solid line indicates the shape of the torsion beam 1 in the upper and lower dies 10, The pressure of the torsion beam 1 is released to spring back the torsion beam 1.

That is, when the torsion beam 1 is formed by the upper mold 10 and the lower mold 20, the torsion beam 1 is cold-formed in a U-shape or a V-shape more concave than the target shape set by the designer, It is possible to manufacture the torsion beam 1 having the target shape required by the designer even when the spring back occurs, thereby improving the commerciality of the torsion beam and reducing the cost and time required for manufacturing the torsion beam.

Concretely, the torsion beam 1 has a concave portion 3 which is a bent portion at the center side in the sectional shape of the center portion and the transition portion, a rectilinear portion 5 which is a straight line portion extending from the concave portion 3 to both sides, The upper mold 10 and the lower mold 20 are formed such that the cavity 30 is extended from the rectilinear section 5 of the torsion beam And the base material is formed to be cold-formed at a position spaced apart from the inner side by a predetermined angle.

3 to 7, the base material of the torsion beam 1 is processed in the form of a dotted line when pressure is applied by the upper mold 10 and the lower mold 20 in the process of cold press forming, And when the pressure of the lower mold 20 is released, it finally becomes a solid line shape due to spring back.

Accordingly, in the present technology, the cavity 30 formed by the upper and lower dies 10 and 20 is formed so that the torsion beam 1 is formed by the dotted line, which is intentionally spaced from the solid line by a predetermined angle? The torsion beam 1 having the shape required by the designer can be manufactured.

Here, the setting angle? May be a point at which the reference point is connected to the concave portion 3 and the straight line portion 5 of the torsion beam.

Further, the set angle? Gradually increases as the bending restoration amount of the torsion beam 1 is nearest to the point where the bending restoration amount of the torsion beam 1 is maximized by spring back with respect to the longitudinal direction of the torsion beam 1 have.

That is, since the torsion beam 1 has different cross-sectional shapes processed along the longitudinal direction, the bending restoration amount by which the base material is restored by the spring back will also be different.

Therefore, the point at which the bending restoration amount by springback is greatest is set as the point where the setting angle [theta] is the largest, and the setting angle [theta] is set to be gradually decreased as the distance from the point to the left and right is increased. The beam 1 can be manufactured with an accurate target shape.

That is, the set angle? Can be set to gradually increase until reaching the maximum correction point spaced a predetermined distance from the point of the transition point connected to both ends, and to gradually decrease from the maximum correction point to the central portion .

Here, the maximum correction point may be a point separated by three quarters of a distance between both ends and the center portion with respect to both ends.

This is confirmed through a number of experiments, and the setting angle [theta] shown in FIG. 7 is measured to the greatest extent than the setting angles [theta] shown in FIGS. As shown in Fig. 1, the position at which the setting angle? Is measured to the greatest extent is a position (F (F)) spaced by 3/4 of the distance between the both ends and the center (C-C ' -F 'point).

Therefore, the upper mold 10 and the lower mold 20 are formed such that the torsion beam 1 is formed so as to have the largest setting angle at the two F-F 'points, So that the torsion beam 1 having the shape required by the designer can be manufactured.

In addition, the upper mold 10 and the lower mold 20 of the present invention can be formed so that the cavity 30 has the same cross-sectional shape at both ends of the torsion beam 1 up to a predetermined distance toward the center with respect to both ends.

This is because the both end portions of the torsion beam 1 are formed into a rectangular shape in cross section and the cross-sectional shape changes from U-shape to U-shape or V-shape toward the center side. I never do that.

Therefore, the upper mold 10 and the lower mold 20 are formed so as to be cold-formed in the target shape at the transition portion adjacent to the both ends of the torsion beam 1 by the predetermined distance, so that the torsion beam 1 can be formed in a desired shape .

According to the mold for manufacturing a torsion beam having the above-described structure, even if the base material of the torsion beam is a high-strength steel material, the ease of manufacturing the bar torsion beam that can realize a torsion beam having a shape required by the designer can be improved.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

1: torsion beam 3: concave
5: straight portion 7: earring portion
10: Upper mold 13: Projection
20: lower mold 23: seat part
30: Cavity
θ: Setting angle

Claims (8)

A U-shaped or V-shaped central portion having a cross-sectional shape in a cross-sectional shape; a pair of end portions each having a cross-sectional shape, And a transition portion that gradually changes from U-shape to V-shape in a square. As a mold for manufacturing the torsion beam,
And a cavity formed between the upper mold and the lower mold, wherein the cavity is U-shaped or V-shaped more concave than the central portion of the cold-formed torsion beam and the cross-sectional shape of the transition portion,
The torsion beam is composed of a concave portion which is a bent portion at the center side and a straight portion which is a straight line portion extending from both sides of the concave portion and an inferring portion which is bent at both sides from the straight portion, ,
The upper mold and the lower mold are formed such that the base material is cold-formed at a point where the cavity is spaced apart from the linear portion of the torsion beam by a predetermined angle,
The set angle gradually increases until reaching a maximum correction point spaced a predetermined distance from the point of the transition point connected to both ends, is set to gradually decrease until reaching the center from the maximum correction point,
Wherein the maximum correction point is formed in an area between an intermediate point between both ends and a center part of the torsion beam and a middle part of the torsion beam. delete The method according to claim 1,
Wherein the setting angle is a point at which the reference point is connected to the concave portion and the straight line portion of the torsion beam. The method according to claim 1,
Wherein the set angle gradually increases as the bending restoration amount of the torsion beam is nearest to the point where the torsion beam is restrained by the spring back with respect to the longitudinal direction of the torsion beam. delete The method according to claim 1,
Wherein the maximum correction point is a point spaced apart by three quarters of a distance between both ends and a center portion with respect to both ends. The method according to claim 1,
Wherein the cavity of the upper mold and the cavity of the lower mold are formed so as to have the same center cross-sectional shape as the end portions of the torsion beam up to the set distance to the center with respect to both ends. The method according to claim 1,
Wherein the torsion beam is a high strength steel having a strength of 80 kgf / mm 2 (780 MPa) or more.
KR1020170010841A 2017-01-24 2017-01-24 Manufacturing mold of torsion beam KR101869898B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100797370B1 (en) 2006-12-11 2008-01-22 주식회사 포스코 Method for manufacturing torsion beam of tubular ctba and torsion beam manufactured by the same
KR101242818B1 (en) * 2012-04-18 2013-03-12 권오근 Corrugated steel plate forming mold and corrugated steel plate using the forming mold
KR101537381B1 (en) * 2014-05-13 2015-07-21 (주)나재 Bending press apparatus for spring back reduction
JP2016022479A (en) * 2014-07-16 2016-02-08 株式会社ワイテック Torsion beam molding die
KR101657834B1 (en) * 2014-12-24 2016-09-20 주식회사 포스코 Manufacturing method for torsion beam having ultra high strength

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100797370B1 (en) 2006-12-11 2008-01-22 주식회사 포스코 Method for manufacturing torsion beam of tubular ctba and torsion beam manufactured by the same
KR101242818B1 (en) * 2012-04-18 2013-03-12 권오근 Corrugated steel plate forming mold and corrugated steel plate using the forming mold
KR101537381B1 (en) * 2014-05-13 2015-07-21 (주)나재 Bending press apparatus for spring back reduction
JP2016022479A (en) * 2014-07-16 2016-02-08 株式会社ワイテック Torsion beam molding die
KR101657834B1 (en) * 2014-12-24 2016-09-20 주식회사 포스코 Manufacturing method for torsion beam having ultra high strength

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