US20110107805A1 - Method for Forming an U-shaped Metal Frame - Google Patents

Method for Forming an U-shaped Metal Frame Download PDF

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Publication number
US20110107805A1
US20110107805A1 US12/839,422 US83942210A US2011107805A1 US 20110107805 A1 US20110107805 A1 US 20110107805A1 US 83942210 A US83942210 A US 83942210A US 2011107805 A1 US2011107805 A1 US 2011107805A1
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US
United States
Prior art keywords
forming
pipe
billet
metal frame
connecting portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/839,422
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English (en)
Inventor
Cheng-Hsin Lee
Chang-Yu Hsu
Cheng-Kai Chiu Huang
Chinh-Yu Chuang
Ping-Kuo Cheng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metal Industries Research and Development Centre
Original Assignee
Metal Industries Research and Development Centre
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metal Industries Research and Development Centre filed Critical Metal Industries Research and Development Centre
Assigned to METAL INDUSTRIES RESEARCH & DEVELOPMENT CENTRE reassignment METAL INDUSTRIES RESEARCH & DEVELOPMENT CENTRE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, PING-KUO, CHIU HUANG, CHENG-KAI, CHUANG, CHINH-YU, HSU, CHANG-YU, LEE, CHENG-HSIN
Publication of US20110107805A1 publication Critical patent/US20110107805A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • 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
    • B21D7/00—Bending rods, profiles, or tubes

Definitions

  • the present invention relates to a method for forming an U-shaped metal frame that can simplify its forming process.
  • U-shaped frame such as a horizontal main frame, an engine holder, or seat support of a car, made of a metal tube is used in vehicle and aerospace industries to connect with other parts.
  • an U-shaped metal frame 10 is used in a seat support of a car and includes a spaced section 11 and a first and a second side segments 12 , 13 , wherein the spaced section 11 includes a larger-diameter expanding portion 111 disposed on a central portion thereof, and the first and the second side segments 12 , 13 include a first and a second recessed parts 121 , 131 mounted on one sides thereof respectively, the first and second recessed parts 121 , 131 include curve or convex cross section formed thereon individually.
  • Plural punching dies are used to punch the spaced section 11 , the first and the second side segments 12 , 13 individually, and then the spaced section 11 , the first and the second side segments 12 , 13 are welded together, thus increasing die cost and having complicate forming processes.
  • a number of connecting positions of the spaced section 11 , the first and the second side segments 12 , 13 are welded together, increasing production cost.
  • the spaced section 11 , the first and the second side segments 12 , 13 are welded together after being punched, lowering rigidity and strength of the metal frame.
  • the metal frame 10 is made by using a fluid forming method, wherein a straight tube is bent by a tube bending machine to form a U shape, the U-shaped tube is placed into a cavity of a forming mold, and then a punching head is used to close two ends of the U-shaped tube, a high-pressure fluid is fed into the U-shaped tube so that the U-shaped tube is inflated in the cavity to form a concave or convex cross section on a first and a second recessed parts 121 , 131 of the first and the second side segments 12 , 13 individually, however, if a low-cost mold is applied to form the first and the second recessed parts 121 , 131 , the first and the second side segments 12 , 13 are not removed from the mold easily to form the first and second recessed parts 121 , 131 , accordingly another molds have to be used to form the concave or convex cross section on the first and the second recessed parts 121 ,
  • the present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
  • the primary object of the present invention is to provide a method for forming an U-shaped metal frame that can simplify its forming process.
  • Secondary object of the present invention is to provide a method for forming a U-shaped metal frame that can lower production cost.
  • Further object of the present invention is to provide a method for forming an U-shaped metal frame that can form a concave or convex cross section on the spaced section and the first and the second side segments individually to save mold cost.
  • Another object of the present invention is to provide a method for forming an U-shaped metal frame that can decrease connecting portions of the U-shaped metal frame to enhance strength and smooth surface.
  • a preparing means bend forming a straight tube in a continuous curve shape to be a billet of the metal frame, and the billet including a spaced section and a first and a second side segments twisted toward opposite directions individually;
  • a forming means placing the billet of the metal frame into a cavity of a forming mold, and closing two ends of the billet, and then feeding a high-pressure fluid into the billet so that a concave or convex cross section is formed on the billet;
  • a cutting means cutting the billet into the first and the second pipes, and the first pipe including a first connecting portion formed in a first cut position thereof, and the second pipe including a second connecting portion formed in a second cut position thereof;
  • a connecting means twisting the first side segment of the first pipe and the second side segment of the second pipe toward the same direction, and connecting the first connecting portion of the first pipe and the second connecting portion of the second pipe together to obtain the U-shaped metal frame.
  • FIG. 1 is a perspective view showing a conventional U-shaped metal frame
  • FIG. 2 is a process for forming the conventional U-shaped metal frame
  • FIG. 3 is another process for forming the conventional U-shaped metal frame
  • FIG. 4 is a process for forming an U-shaped metal frame according to a first embodiment of the present invention
  • FIG. 5 is a cross sectional view showing a preparing means of a method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 6 is a cross sectional view showing a forming means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 7 is a cross sectional view showing a fluid forming of a forming means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention.
  • FIG. 8 is a cross sectional view showing a heat treating of a forming means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 9 is a cross sectional view showing a cutting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention.
  • FIG. 10 is a cross sectional view showing a connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention.
  • FIG. 11-1 is a side plan view showing the connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 11-2 is another side plan view showing the connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 12-1 is another side plan view showing the connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 12-2 is another side plan view showing the connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 12-3 is another side plan view showing the connecting means of the method for forming the U-shaped metal frame according to the first embodiment of the present invention
  • FIG. 13 is a cross sectional view showing a preparing and a forming means of a method for forming the U-shaped metal frame according to a second embodiment of the present invention
  • FIG. 14 is a cross sectional view showing a cutting means of the method for forming the U-shaped metal frame according to the second embodiment of the present invention.
  • FIG. 15 is a cross sectional view showing a connecting means of the method for forming the U-shaped metal frame according to the second embodiment of the present invention.
  • FIG. 16 is a cross sectional view showing a preparing means of a method for forming the U-shaped metal frame according to a third embodiment of the present invention.
  • FIG. 17 is a cross sectional view showing a forming means of a method for forming the U-shaped metal frame according to the third embodiment of the present invention.
  • FIG. 18 is a cross sectional view showing a cutting means of the method for forming the U-shaped metal frame according to the third embodiment of the present invention.
  • FIG. 19 is a cross sectional view showing a connecting means of the method for forming the U-shaped metal frame according to the third embodiment of the present invention.
  • FIG. 20 is a cross sectional view showing a preparing means of a method for forming the U-shaped metal frame according to a fourth embodiment of the present invention.
  • FIG. 21 is a cross sectional view showing a forming means of a method for forming the U-shaped metal frame according to the fourth embodiment of the present invention.
  • FIG. 22 is a cross sectional view showing a cutting means of the method for forming the U-shaped metal frame according to the fourth embodiment of the present invention.
  • FIG. 23 is a cross sectional view showing a connecting means of the method for forming the U-shaped metal frame according to the fourth embodiment of the present invention.
  • a method for forming an U-shaped metal frame 20 in accordance with a first embodiment of the present invention comprises the step of providing a metal straight tube in a preparing means, wherein the straight tube is bend formed in a continuous curve shape to be a billet of the metal frame 20 , the billet includes a spaced section 201 and a first and a second side segments 202 , 203 twisted toward opposite directions individually.
  • the straight tube is bent by a tube bending machine to form a continuous curve shape. As shown in FIGS.
  • the billet is placed into a cavity of a forming mold, and the forming mold is split along a curved axial line of the billet, the cavity includes two punching heads disposed on two sides thereof respectively to close two ends of the billet, and a high-pressure fluid is fed into the billet so that the billet is inflated in the cavity to form a concave or convex cross section on the spaced section 201 and the first and the second side segments 202 , 203 individually, wherein the spaced section 201 of the billet includes an expanding portion 204 formed thereon, and the first side segment 202 includes a first recessed part 205 formed thereon, and the second side segment 203 includes a second recessed part 206 formed thereon.
  • the concave or convex cross section is formed on the spaced section 201 by using a fluid forming or a heat treating method.
  • the fluid forming method includes placing the billet of the metal frame 20 into the cavity of the forming mold, and the punching heads of the cavity are used to close the two ends of the billet, the high-pressure fluid is fed into the billet directly so that the billet of the metal frame 20 is inflated in the cavity by using a pressure of the high-pressure fluid, and then the concave or convex cross section is formed on the billet.
  • the heat treating method includes pre-heating the billet of the metal frame 20 to a suitable thermoplastic temperature and then placing the billet into the cavity of the forming mold, the forming mold is heated to be at the suitable thermoplastic temperature, and the punching heads of the cavity are applied to close the two ends of the billet, a high-pressure air is further fed into the billet so that the billet of the metal frame 20 is inflated by a pressure of the high-pressure air, hence the concave or convex cross section is formed on the billet.
  • the billet of the frame 20 is cut in a cutting means, wherein rest materials of the first and the second side segments 202 , 203 are cut, and then the spaced section 201 is cut as well so that the billet of the metal frame 20 is separated into a first pipe 20 a and a second pipe 20 b .
  • the expanding portion 204 of the spaced section 201 is cut so that the billet of the metal frame 20 is separated into the first pipe 20 a and a second pipe 20 b
  • the first pipe 20 a includes a first connecting portion 207 formed in a first cut position thereof
  • the second pipe 20 b includes a second connecting portion 208 formed in a second cut position thereof.
  • the first pipe 20 a and the second pipe 20 b are connected together in a connecting means, the first side segment 202 of the first pipe 20 a and the second side segment 203 of the second pipe 20 b are twisted toward the same direction, then the first connecting portion 207 of the first pipe 20 a and the second connecting portion 208 of the second pipe 20 b are connected with each and coupled together to obtain the U-shaped metal frame 20 .
  • the first and the second pipes 20 a , 20 b include an equal diameter or different diameters respectively to be connected together. As illustrated in FIGS.
  • first and the second connecting portions 207 , 208 when the first and the second connecting portions 207 , 208 include the same diameter, the first connecting portion 207 of the first pipe 20 a and the second connecting portion 208 of the second pipe 20 b are connected together to form a connection therebetween, and then the connection of the first and the second connecting portions 207 , 208 is welded, then a first weld head 21 is used to fix the first and the second pipes 20 a , 20 b or a connector 22 is fixed to the connection of the first and the second connecting portions 207 , 208 , and the first and the second connecting portions 207 , 208 are fixed by first screw elements 23 individually. Referring to FIGS.
  • the punching head is used to punch a hole with an increased diameter on the first connecting portion 207 of the first pipe 20 a , and the first connecting portion 207 of the first pipe 20 a is fitted with the second connecting portion 208 of the second pipe 20 b , then a fitting position of the first and the second connecting portions 207 , 208 is welded, thereafter a second weld head 24 is applied to fix the first and the second pipes 20 a , 20 b together or a second screw element 25 is screwed into the fitting position of the first and the second connecting portions 207 , 208 .
  • a bonding agent is applied onto the fitting position of the first and the second connecting portions 207 , 208 so that the first and the second pipes 20 a , 20 b are adhered together.
  • a method for forming an U-shaped metal frame 30 in accordance with a second embodiment of the present invention comprises the step of providing a metal straight tube in a preparing means and a forming means, wherein the straight tube is bend formed in a continuous curve shape to be a billet of the metal frame 30 , the billet includes a spaced section 301 and a first and a second side segments 302 , 303 , and the spaced section 301 of the billet includes an expanding portion 304 formed thereon by using a high-pressure fluid forming or a heat treating method, the first side segment 302 includes a first recessed part 305 formed thereon, and the second side segment 303 includes a second recessed part 306 formed thereon.
  • the billet of the frame 30 is cut in a cutting means, wherein rest materials of the first and the second side segments 302 , 303 are cut, and then the spaced section 301 is cut as well so that the billet of the metal frame 30 is separated into a first pipe 30 a and a second pipe 30 b .
  • a certain position between the expanding portion 304 of the spaced section 301 and a curved corner of the spaced section 301 is cut so that the billet of the metal frame 30 is separated into the first pipe 30 a and the second pipe 30 b , and the first pipe 30 a includes a first connecting portion 307 formed in a first cut section thereof, and the second pipe 30 b includes a second connecting portion 308 formed in a second cut section thereof.
  • the first pipe 30 a includes a first connecting portion 307 formed in a first cut section thereof
  • the second pipe 30 b includes a second connecting portion 308 formed in a second cut section thereof.
  • the first pipe 30 a and the second pipe 30 b include an equal diameter or different diameters respectively and are connected together in a connecting means, wherein the first connecting portion 307 of the first pipe 30 a and the second connecting portion 308 of the second pipe 30 b are connected with each to obtain the U-shaped metal frame 30 .
  • a method for forming an U-shaped metal frame 40 in accordance with a third embodiment of the present invention comprises the step of providing a metal straight tube in a preparing means, wherein the straight tube is bend formed in a continuous curve shape to be a billet of the metal frame 40 , the billet includes a spaced section 401 and a first and a second side segments 402 , 403 .
  • the billet of the frame 40 is fluid formed or heat treated in a forming means so that on the spaced section 401 and the first and the second side segments 402 , 403 is formed a concave or convex cross section individually, wherein the spaced section 401 of the billet of the frame 40 includes a first recessed part 404 and a second recessed part 405 formed thereon, and the first side segment 402 includes an expanding portion 406 formed thereon. As illustrated in FIGS.
  • the billet of the frame 40 is cut in a cutting means, wherein rest materials of the first and the second side segments 402 , 403 are cut, and then the spaced section 401 is cut as well so that the billet of the metal frame 40 is separated into a first pipe 40 a and a second pipe 40 b .
  • a central portion of the spaced portion 401 is cut into the first pipe 40 a and the second pipe 40 b , and one side of the expanding portion 406 of the first pipe 40 a is cut to eliminate rest material, thus forming a first connecting portion 407 , and one side of the second side segment 403 of the second pipe 40 b is cut to eliminate rest material, forming a second connecting portion 408 .
  • the first pipe 40 a and the second pipe 40 b include an equal diameter or different diameters respectively and are connected together in a connecting means, wherein the first connecting portion 407 of the first pipe 40 a and the second connecting portion 408 of the second pipe 40 b are connected with each to obtain the U-shaped metal frame 40 .
  • a method for forming an U-shaped metal frame 40 in accordance with a fourth embodiment of the present invention comprises the step of providing a metal straight tube in a preparing means, wherein the straight tube is bend formed in a continuous curve shape to be a billet of the metal frame 50 , the billet includes a spaced section 501 and a first and a second side segments 502 , 503 .
  • the billet of the frame 50 is fluid formed or heat treated in a forming means so that on the spaced section 501 and the first and the second side segments 502 , 503 is formed a concave or convex cross section individually, wherein the spaced section 501 of the billet of the frame 50 includes a first recessed part 504 and a second recessed part 505 formed thereon, and the first side segment 502 includes a first expanding portion 506 formed thereon, the second side segment 503 includes a second expanding portion 507 formed thereon. As illustrated in FIGS.
  • the billet of the frame 50 is cut in a cutting means, wherein rest materials of the first and the second side segments 502 , 503 are cut, and then the spaced section 501 is cut as well so that the billet of the metal frame 50 is separated into a first pipe 50 a and a second pipe 50 b .
  • a central portion of the spaced portion 501 is cut into the first pipe 50 a and the second pipe 50 b , and the first expanding portion 506 of the first pipe 50 a and the second expanding portion 507 of the second pipe 50 b are cut to eliminate rest materials, thus form a first connecting portion 508 on the first expanding portion 506 and a second connecting portion 509 on the second expanding portion 507 .
  • the first pipe 50 a and the second pipe 50 b include an equal diameter or different diameters respectively and are connected together in a connecting means, wherein the first connecting portion 508 of the first pipe 50 a and the second connecting portion 509 of the second pipe 50 b are connected with each to obtain the U-shaped metal frame 50 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US12/839,422 2009-10-29 2010-07-20 Method for Forming an U-shaped Metal Frame Abandoned US20110107805A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW098136698A TW201114521A (en) 2009-10-29 2009-10-29 Method of forming and manufacturing U-shaped metal tube support frame
TW098136698 2009-10-29

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US20110107805A1 true US20110107805A1 (en) 2011-05-12

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US12/839,422 Abandoned US20110107805A1 (en) 2009-10-29 2010-07-20 Method for Forming an U-shaped Metal Frame

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8356506B2 (en) 2011-02-25 2013-01-22 Szuba Consulting, Inc. Method of forming industrial housings
US8806733B2 (en) 2011-08-16 2014-08-19 Szuba Consulting, Inc. Method of forming a universal joint
CN104607536A (zh) * 2015-02-10 2015-05-13 厦门伊格特精密机械有限公司 一种客车座椅骨架的自动成型机
CN104785619A (zh) * 2015-03-31 2015-07-22 衡阳风顺车桥有限公司 车架变截面弯管梁加工工艺
CN105223717A (zh) * 2015-09-30 2016-01-06 惠科电子（深圳）有限公司 面框及具有该面框的曲面液晶显示设备
DE102015006579A1 (de) * 2015-05-21 2016-11-24 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Rohrrahmenstruktur für einen Kraftfahrzeugsitz
EP3184189A1 (de) * 2015-12-22 2017-06-28 Familie Burger GbR Verfahren und vorrichtung zur herstellung eines hinterachsträgers für ein kraftfahrzeug
CN111842608A (zh) * 2020-06-04 2020-10-30 浙大宁波理工学院 一种扭转件的压涨复合内高压成形装置及工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI633862B (zh) * 2017-06-06 2018-09-01 魏至頎 Frame combination

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US6442820B1 (en) * 2000-10-26 2002-09-03 F & P Mfg., Inc. Method and apparatus for forming a tube having an article inserted therein
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US7293442B1 (en) * 2007-03-26 2007-11-13 Gm Global Technology Operations, Inc. Method for hydroforming a ring-shaped tubular structure
US20100186473A1 (en) * 2007-07-20 2010-07-29 Masaaki Mizumura Method for hydroforming and hydroformed product

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US3789642A (en) * 1972-06-12 1974-02-05 Asea Ab Method for hydrostatic extrusion of tubes
US3889506A (en) * 1974-03-25 1975-06-17 Western Electric Co Method and apparatus for forming a tubular billet about a mandrel using multi-directional stress
US5445001A (en) * 1994-08-10 1995-08-29 General Motors Corporation Method and apparatus for forming and cutting tubing
US5899498A (en) * 1994-12-20 1999-05-04 Cosma International Cradle assembly
US5666840A (en) * 1996-06-13 1997-09-16 General Motors Corporation Method for piercing two aligned holes in a hydroformed tube
US5884722A (en) * 1997-01-23 1999-03-23 Dana Corporation Engine cradle for vehicle body and frame assembly and method of manufacturing same
US6776953B1 (en) * 1998-08-29 2004-08-17 Daimlerchrysler Ag Method and device for forming a hollow body
US6442820B1 (en) * 2000-10-26 2002-09-03 F & P Mfg., Inc. Method and apparatus for forming a tube having an article inserted therein
US6505389B2 (en) * 2000-12-19 2003-01-14 F&P Mfg., Inc. Apparatus and method for forming a tube having an article attached thereto
US20030005737A1 (en) * 2001-06-25 2003-01-09 Gharib Mohamed T. Hydroforming process and apparatus for the same
US20060248933A1 (en) * 2003-05-24 2006-11-09 Gerhard Linke Method for producing a peripherally closed hollow profield element
US20050252263A1 (en) * 2004-05-14 2005-11-17 Macewen Stuart R Methods of and apparatus for forming hollow metal articles
US20060005393A1 (en) * 2004-07-08 2006-01-12 Nelson Wagner Method of manufacturing a combined driveshaft tube and yoke assembly
US7293442B1 (en) * 2007-03-26 2007-11-13 Gm Global Technology Operations, Inc. Method for hydroforming a ring-shaped tubular structure
US20100186473A1 (en) * 2007-07-20 2010-07-29 Masaaki Mizumura Method for hydroforming and hydroformed product

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8356506B2 (en) 2011-02-25 2013-01-22 Szuba Consulting, Inc. Method of forming industrial housings
US8806733B2 (en) 2011-08-16 2014-08-19 Szuba Consulting, Inc. Method of forming a universal joint
CN104607536A (zh) * 2015-02-10 2015-05-13 厦门伊格特精密机械有限公司 一种客车座椅骨架的自动成型机
CN104785619A (zh) * 2015-03-31 2015-07-22 衡阳风顺车桥有限公司 车架变截面弯管梁加工工艺
DE102015006579A1 (de) * 2015-05-21 2016-11-24 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Rohrrahmenstruktur für einen Kraftfahrzeugsitz
CN105223717A (zh) * 2015-09-30 2016-01-06 惠科电子（深圳）有限公司 面框及具有该面框的曲面液晶显示设备
EP3184189A1 (de) * 2015-12-22 2017-06-28 Familie Burger GbR Verfahren und vorrichtung zur herstellung eines hinterachsträgers für ein kraftfahrzeug
CN111842608A (zh) * 2020-06-04 2020-10-30 浙大宁波理工学院 一种扭转件的压涨复合内高压成形装置及工艺

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TWI393599B (https=) 2013-04-21

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