KR101516127B1 - Method for vehicle chassis frame manifacturing using roll forming and hot blowing forming - Google Patents

Method for vehicle chassis frame manifacturing using roll forming and hot blowing forming Download PDF

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Publication number
KR101516127B1
KR101516127B1 KR1020140128257A KR20140128257A KR101516127B1 KR 101516127 B1 KR101516127 B1 KR 101516127B1 KR 1020140128257 A KR1020140128257 A KR 1020140128257A KR 20140128257 A KR20140128257 A KR 20140128257A KR 101516127 B1 KR101516127 B1 KR 101516127B1
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South Korea
Prior art keywords
tube
roll
forming
raw material
manufacturing
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KR1020140128257A
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Korean (ko)
Inventor
이상일
서정식
김정섭
황한영
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서진산업 주식회사
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Priority to KR1020140128257A priority Critical patent/KR101516127B1/en
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Publication of KR101516127B1 publication Critical patent/KR101516127B1/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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
    • B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The present invention relates to a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method, and a chassis component manufactured by the manufacturing method. More particularly, the present invention relates to a method for manufacturing a chassis component of a vehicle, comprising the steps of: producing a planar raw material; Molding the raw material into a roll form by a roll forming process; Forming a pipe or a tube by high frequency welding and cutting the raw material molded in a roll form; And a step of subjecting the pipe or tube to a hot blow molding process by a hot blow forming apparatus to produce a box-type closed end surface component. The one-piece closed-end chassis using the roll forming and hot blow forming fusing method And a method of manufacturing the component.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a one-piece closed chassis component using roll forming and hot blow forming techniques,

The present invention relates to a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method, and a chassis component manufactured by the manufacturing method.

Most of the chassis components applied to a vehicle are subjected to a process of manufacturing several pieces and a process of assembling such pieces to manufacture a finished part.

Fig. 1 shows a process drawing showing a manufacturing process of a usual single product 2. Fig. As shown in FIG. 1, the single-product manufacturing process is generally performed by blanking the raw material 1 in the form of a flat plate, and then forming the raw material 1 by a mold.

2 is a process diagram showing a conventional single component assembling process. In order to complete the box-type part 3, it is necessary to assemble the plurality of parts 1 as described above. As shown in FIG. 2, in the process of assembling the parts 1, Is executed.

In addition, the box-type part 3, which is assembled by a welding process, is applied to many chassis components of a vehicle

FIG. 3A is a perspective view of a front suspension module, and FIG. 3B is a perspective view of a # -shaped FRT S / FRAME (front subframe, 4) which is a constitution of the front suspension module of FIG. 3A. 4A is a front suspension module having an FRT L / ARM, a LH / RH (left and right front lower arm), a left lower right arm, a right hand 6 and an I- Fig. 4B shows a perspective view of an I-shaped FRT S / FRAME 5, which is a constitution of the front suspension of Fig. 4A.

The front suspension is attached to the lower end of the vehicle to support the engine, connect the axle to the vehicle body, support the external load during operation, and support the arm, steering gear box, etc. . Fig. 5 shows a perspective view of the FRT L / ARM, LH / RH 6, which is one configuration of the front suspension of Fig. 4A. FRT L / ARM and LH / RH (6) prevent the abnormal behavior of the tire by supporting the lateral force, the front and rear force, and the up / down force coming through the tire while driving and absorb or mitigate the vibration generated in FRT S / FRAME and Knuckle Function.

6A shows a perspective view of a rear suspension module consisting of an RR C / MBR (rear cross member) 7 and an RR U / ARM (rear upper arm 8). 6B is a perspective view of the RRC / MBR 7, which is a constitution of the rear suspension of FIG. 6A, and FIG. 7 is a perspective view of the RR U / ARM 8 which is a constitution of the rear suspension of FIG. Respectively.

The rear suspension consisting of RR C / MBR (7) and RR U / ARM (8) is a stand-alone suspension using 3 to 5 links. The rear suspension consists of U / Arm, L / / Arm) stabilizer bar, and the like.

Figure 8a shows a perspective view of a rear suspension module with a rear coupled torsion beam axle 11 comprising a trailing arm 9 and a V-beam 10, Figure 8b shows a perspective view of a trailing arm, 9 and a V-beam 10, as shown in FIG. The rear suspension module including the RR CTBA 11 is mounted on the rear wheel of the vehicle to absorb shocks caused by road conditions during straight driving and to maintain the turning stability of the vehicle when turning. A trem ring arm 9, a spring seat, and the like.

The above-mentioned plurality of vehicle chassis parts include a box-type part 3 to which a plurality of individual parts are welded. FIG. 9A shows a perspective view of the box-type part 3 in the # -shaped FRT S / FRAME (4) front suspension module shown in FIG. 3B.

9B shows a perspective view of the box-type part 3 in the # -shaped FRT S / FRAME 4 front suspension module shown in FIG. 4B, and FIG. 9C shows the FRT L / ARM, LH / RH < / RTI > (6) front suspension module.

9D is a perspective view of the box type part 3 in the RR C / MBR 7 shown in FIG. 6B, and FIG. 9E is a perspective view of the box type part 3 in the RR U / ARM 8 shown in FIG. Type part (3).

Fig. 9F shows a perspective view of the box-type part 3 in the RR CTBA 11 shown in Fig. 8B.

As shown in FIGS. 9A to 9F, various chassis parts of a vehicle are made of parts of a box-type type by welding and assembling the individual parts manufactured by the single component process.

However, since the box-type chassis component manufactured by such a welding assembly process necessarily involves a welding process, there is a problem that corrosion occurs in a welded portion over a certain period of time. Fig. 10 shows an enlarged perspective view of the welded portion 12 of the box-type part 3. Fig.

In addition, since the box-type part 3 requires a certain amount of overlap 13 in the welding and assembling process, the weight is increased by the overlap 13, which is not economical. Fig. 11 is an enlarged perspective view showing an overlap 13 of the box-type part 3. Fig.

Korea Patent Publication No. 2014-0001720 Korean Patent Publication No. 2013-0030479

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a new fusion method that combines a roll forming method and a hot blow forming method, A method of manufacturing a one-piece closed end chassis component having improved corrosion resistance, and a chassis component to which the manufacturing method is applied.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. It can be understood.

A first object of the present invention is to provide a method for manufacturing a chassis component of a vehicle, comprising the steps of: producing a flat raw material; Molding the raw material into a roll form by a roll forming process; Forming a pipe or a tube by high frequency welding and cutting the raw material molded in a roll form; And a step of subjecting the pipe or tube to a hot blow molding process by a hot blow forming apparatus to produce a box-type closed end surface component. The one-piece closed-end chassis using the roll forming and hot blow forming fusing method Can be achieved as a manufacturing method of parts.

Further, the method may further include heating the raw material molded in the roll shape after the step of manufacturing the pipe or tube, wherein the step of manufacturing the box-type closed end face component comprises: ; Attaching a compression tube to one end of the raw material molded in the form of a roll and pressing it with an inert gas by means of the compression tube; And a step of cooling by a quenching tube provided at the other end of the raw material molded in the form of a roll.

The mold may be provided with heating means composed of a cartridge, and the upper and lower molds may have an asymmetrical cross section.

In addition, the end surface of the compression pipe and the quenching pipe may have a tapered shape, and the pressure applied to the raw material molded in the roll shape by the compression pipe may be 150 to 400 bar.

A second object of the present invention can be achieved as a chassis part characterized by being manufactured by the manufacturing method according to the first object mentioned above.

According to an embodiment of the present invention, in manufacturing a chassis component, a new fusion method combining roll forming and hot blow forming method is applied to improve the welding corrosion problem and improve the corrosion resistance.

In addition, according to one embodiment of the present invention, it is possible to exclude the step of welding the individual products by the roll forming and hot blow forming fusion method, so that the corrosion of the welded portion can be prevented originally and the manufacturing cost can be reduced .

It should be understood, however, that the effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
Fig. 1 is a process chart showing a typical single product manufacturing process,
Fig. 2 is a process chart showing a conventional single article assembling process,
FIGS. 3A and 3B are perspective views of a # -shaped FRT S / FRAME front suspension module,
4A and 4B are perspective views of an I-shaped FRT S / FRAME front suspension module,
5 is a perspective view of an FRT L / ARM, LH / RH front suspension module,
6A is a perspective view of a rear suspension module composed of RR C / MBR and RR U / ARM,
6B is a perspective view of the RR C / MBR,
7 is a perspective view of the RR U / ARM,
8A and 8B are perspective views of an RR CTBA comprised of a trailing arm and a V-beam,
9A is a perspective view of a box-type part in a # -shaped FRT S / FRAME front suspension module,
9B is a perspective view of a box-type part in an I-shaped FRT S / FRAME front suspension module,
9C is a perspective view of a box-type part in an FRT L / ARM, LH / RH front suspension module,
9D is a perspective view of a box-type part in the RR C / MBR,
9E is a component perspective view of a box-type type in the RR U / ARM,
9F is a perspective view of a box-type part in the RR CTBA,
10 is an enlarged perspective view of a welded portion of a box-
11 is an enlarged perspective view showing an overlap of a box-type part,
12 is a flow chart of a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention,
FIG. 13 is a process diagram showing a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention;
FIG. 14 is a partial perspective view showing a sealing structure of a compression pipe or a quenching pipe of a hot blow forming apparatus according to an embodiment of the present invention; FIG.
15 is a sectional view of a hot blow forming mold according to an embodiment of the present invention,
16A and 16B are a perspective view of an FRT tube manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention,
FIGS. 16C and 16D are perspective views of an FRT body mtg tube, LH / RH, manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention,
FIGS. 16E and 16F are perspective views of an FRT arm tube, LH / RH, manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention;
FIGS. 16G and 16H are cross-sectional views of an FRT No1 tube and an S / MBR tube, an LH / RH tube, and an LH / RH tube manufactured by a method of manufacturing a one- piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention Perspective,
16I and 16J are perspective views of an RR UPR tube manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention,
FIGS. 16K and 16L are cross-sectional views of the RR Tubular tube, the T / ARM tube, the LH / RH tube manufactured by the method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Hereinafter, a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method will be described in an embodiment of the present invention. The manufacturing method according to an embodiment of the present invention is applied to all parts of the box type, and the following description merely shows one preferred embodiment, and thus the scope of the right should not be interpreted.

12 is a flowchart illustrating a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention. 13 is a process diagram showing a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention.

As shown in FIGS. 12 and 13, first, a flat raw material 1 is produced (S1). In the concrete example, a raw material 1 of boron-steel material was used. The flat raw material 1 is put into a roll forming apparatus 20 and is manufactured in a roll form by a roll forming method (S2). The ends are welded to each other by high-frequency welding and cut (S3) Or the tube 15 (S4).

After the pipe 14 or the tube 15 is formed by a roll forming process, a heating process is performed (S5). In a specific embodiment, the heating process is heated by the roll conveyor 30 belt to about 960 ° C for about 180-200 seconds.

Then, the heated pipe 14 is put into the hot blow forming apparatus 40 and is manufactured in a desired form by a hot blow forming step (S6).

13, the hot blow forming apparatus 40 according to the embodiment of the present invention includes a mold 41 having a top mold 42 and a bottom mold 43, an inert gas compression pipe 44, A quenching tube 45, and the like.

According to an embodiment of the present invention, after the heated pipe 14 or the tube 15 is provided inside the mold 41, the upper mold 42 and the lower mold 43 are fixed, And the hot air blow-molding is performed so that the pipe 14 and the tube 15 are shaped into the metal mold 41. [0052] After the inert gas is introduced and molded, it is rapidly cooled by the quenching tube 45, and the closed end chassis component is manufactured by the laser cutting process S7.

13, the upper mold 42 and the lower mold 43 of the mold 41 are provided with heating means inside the hot mold forming mold 41, And the cartridge 46 is applied as the heating means according to the specific embodiment. The mold is maintained at a temperature of 400 to 600 ° C by the cartridge 46 provided in the mold 41.

In addition, an inert gas compression pipe 44 is used for forming the parts, and an inert gas is introduced to press the pressure of about 150 to 400 bar. Further, as shown in Fig. 13, in order to increase the strength of the component, the quenching pipe 45 is arranged on the opposite side of the inert gas compression pipe 44, so that it can be immediately cooled after the molding.

Further, when the inert gas is introduced into the pipe by the compression pipe (44) in the hot blow forming step, the compression pipe (44) is closed to prevent the outflow of the inert gas and to prevent the cooling water from flowing out during cooling by the quenching pipe And the quench tube 45 are applied with a conical sealing structure. 14 is a partial perspective view showing the sealing structure of the compression pipe 44 or the quenching pipe 45 of the hot blow forming apparatus 40 according to the embodiment of the present invention.

14, the ends of each of the compression pipe 44 and the quench pipe 45 have a tapered structure, so that the inert gas is pressurized by the compression pipe 44, And it can be seen that when the cooling water is introduced by the quenching tube 45, the cooling water also can be sealed to prevent the cooling water from flowing out.

15 is a sectional view of a hot blow forming mold 41 according to an embodiment of the present invention. As shown in FIG. 15, the upper mold 42 and the lower mold 43 of the hot blow forming mold 41 according to an embodiment of the present invention have an asymmetric structure.

16A to 16L are perspective views of various vehicle chassis parts manufactured by the method of manufacturing a one-piece closed end chassis component using the roll forming and hot blow forming fusion method according to an embodiment of the present invention described above. 16A to 16L, various vehicle chassis parts manufactured by the method of manufacturing one-piece closed-end chassis component using the roll forming and hot blow forming fusion method according to an embodiment of the present invention, It is possible to reduce the cost of production by eliminating the need for overlap in the welded portion.

16A and 16B show a perspective view of a FRT tube 16 manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention.

16C and 16D are perspective views of the FRT body mtg tube 17, LH / RH, manufactured by the method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention FIG. 16E and 16F are cross sectional views of the FRT female tube 18, the LH / RH tube and the LH / RH tube manufactured by the method of manufacturing the one-piece closed end chassis component using the roll forming and hot blow forming fusion method according to an embodiment of the present invention FIG.

16G and 16H are cross sectional views of FRT No1 tube and S / MBR tube, LH / LHR tube manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention, RH and FIG. 16J are perspective views of an RR UPR tube manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention. FIG.

FIGS. 16K and 16L are cross-sectional views of a RR tubular tube, a T / ARM tube, an LH / L tube, and the like manufactured by a method of manufacturing a one-piece closed end chassis component using a roll forming and hot blow forming fusion method according to an embodiment of the present invention. RH. ≪ / RTI >

The present invention can also be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers of the technical field to which the present invention belongs.

It should be noted that the above-described apparatus and method are not limited to the configurations and methods of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1: Raw materials
2: Single item
3: Box type parts
4: # shaped front sub-frame
5: I-shaped forward sub-frame
6: Left and right front lower arm
7: rear crossmember
8:
9: Trail Ring
10: V-beam
11: RR CTBA
12:
13: overlap
14: pipe
15: tube
16: front tube
17: mtg tube
18: front arm tube
20: roll forming device
30: Roll conveyor
40: Hot blow forming device
41: Mold
42:
43: Lower mold
44: Compression tube
45: quench tube
46: Cartridge

Claims (5)

A method for manufacturing a chassis component of a vehicle,
Producing a flat plate-like raw material;
Molding the raw material into a roll form by a roll forming process;
Forming a pipe or a tube by high frequency welding and cutting the raw material molded in a roll form; And
And a step of hot-blow molding the pipe or tube by a hot blow forming apparatus to manufacture a box-type closed end surface component,
Heating the raw material shaped in the form of a roll after the step of manufacturing the pipe or tube,
The step of manufacturing the box-type closed end face component includes:
Installing a raw material molded in the roll form into a mold;
Attaching a compression tube to one end of the raw material molded in the form of a roll and pressing it with an inert gas by means of the compression tube; And
And cooling the raw material by a quenching tube provided at the other end of the roll-shaped raw material. The method of manufacturing a one-piece closed end chassis component using the roll forming and hot blow forming fusion method.
delete The method according to claim 1,
Wherein the mold is provided with heating means composed of a cartridge and the upper and lower molds have an asymmetrical cross section.
The method according to claim 1,
Wherein the end surface of the compression tube and the quenching tube have a tapered shape,
Wherein the pressure applied to the raw material by the compression tube is in the range of 150 to 400 bar. ≪ RTI ID = 0.0 > 15. < / RTI > delete
KR1020140128257A 2014-09-25 2014-09-25 Method for vehicle chassis frame manifacturing using roll forming and hot blowing forming KR101516127B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170024385A (en) * 2015-08-25 2017-03-07 주식회사 성우하이텍 Forming method of shock absorber housing for vehicle
KR101837383B1 (en) * 2017-06-28 2018-04-20 서진산업(주) Method for vehicle Rear Cross Member manifacturing using roll forming, preforming, hot blowing forming and DIfferent Thickness Aluminum Plate
KR101971214B1 (en) * 2018-02-07 2019-08-27 전병안 Manufacturing apparatus for inner pipe
KR20210072850A (en) 2019-12-09 2021-06-18 서진산업 주식회사 Hot blow forming method using TWB pipe
KR20210072851A (en) 2019-12-09 2021-06-18 서진산업 주식회사 Hot blow forming method using Closed section interior wall structure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0994618A (en) * 1995-09-29 1997-04-08 Honda Motor Co Ltd Production of frame shaped structural body
KR20130070387A (en) * 2011-12-19 2013-06-27 주식회사 성우하이텍 Forming method of bumper beam for vehicles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0994618A (en) * 1995-09-29 1997-04-08 Honda Motor Co Ltd Production of frame shaped structural body
KR20130070387A (en) * 2011-12-19 2013-06-27 주식회사 성우하이텍 Forming method of bumper beam for vehicles

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170024385A (en) * 2015-08-25 2017-03-07 주식회사 성우하이텍 Forming method of shock absorber housing for vehicle
KR102329202B1 (en) 2015-08-25 2021-11-22 주식회사 성우하이텍 Forming method of shock absorber housing for vehicle
KR101837383B1 (en) * 2017-06-28 2018-04-20 서진산업(주) Method for vehicle Rear Cross Member manifacturing using roll forming, preforming, hot blowing forming and DIfferent Thickness Aluminum Plate
KR101971214B1 (en) * 2018-02-07 2019-08-27 전병안 Manufacturing apparatus for inner pipe
KR20210072850A (en) 2019-12-09 2021-06-18 서진산업 주식회사 Hot blow forming method using TWB pipe
KR20210072851A (en) 2019-12-09 2021-06-18 서진산업 주식회사 Hot blow forming method using Closed section interior wall structure

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