CN103831390A - Cold heading forming method of car sleeve and mould structure for sleeve forming - Google Patents
Cold heading forming method of car sleeve and mould structure for sleeve forming Download PDFInfo
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- CN103831390A CN103831390A CN201410108429.2A CN201410108429A CN103831390A CN 103831390 A CN103831390 A CN 103831390A CN 201410108429 A CN201410108429 A CN 201410108429A CN 103831390 A CN103831390 A CN 103831390A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 238000009415 formwork Methods 0.000 claims description 29
- 238000000465 moulding Methods 0.000 claims description 20
- 238000012856 packing Methods 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract 1
- 230000033001 locomotion Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a cold heading forming method of a car sleeve and a mould structure for sleeve forming. The cold heading forming method of the car sleeve comprises the steps of S1, wire shearing, S2, pre-cold-heading, S3, deep cold heading, S4, sleeve shape forming through cold heading, S5, pre-forming of the sleeve and S6, forming of the sleeve. The mould structure comprises a punch mould and a main mould fixed on a cold heading forming machine, wherein the punch mould comprises a punch mould shell, a punch mould gasket is arranged inside the punch mould shell, a punch mould cushion block is arranged inside the punch mould gasket, the main mould comprises a main mould ejection needle rear cushion block and a main mould shell located on the main mould ejection needle rear cushion block, and the main mould comprises a mould shell of a three-piece mould, a three-piece mould and a main mould three-piece mould pressing plate. All size machining, including the spheres inside and outside the sleeve and a flange and flower-shaped teeth at two ends of the sleeve, is finished through the cold heading technology, an emptying work procedure is not needed, the time for machining is saved, machining cost is lowered, production efficiency is improved, and produced products can meet international standards.
Description
Technical field
The present invention relates to cold-heading technical field, especially relate to a kind of automobile cold-heading molding method of sleeve and the mould structure of sleeve forming.
Background technology
At present, in cold-heading technical field, the method that manufacture automobile mainly adopts with sleeve is to use steel pipe under the effect of hydraulic press, to utilize folding mold forming ball and flange, in the sleeve inner cavity of this method moulding, can present when irregular indenture uses and can cause damage to automobile component, need to adopt machining to empty operation to barrel bore, processing time many a procedure, process-cycle and the processing cost of the product extending, inefficiency and the product processing are difficult to meet international standards.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automobile cold-heading molding method of sleeve and the mould structure of sleeve forming, it can one time cold-heading molding without machined again, mechanical performance is high, production efficiency is high.
The present invention solves the technical scheme that its technical problem takes: the cold-heading molding method of sleeve for a kind of automobile, and the step of the cold-heading molding method of described sleeve is:
S1, shearing wire rod;
S2, pre-cold-heading, be cavity by two inside cold-headings in end of wire rod;
S3, degree of depth cold-heading, deepen the cavity degree of depth wire rod cold-heading;
S4, cold-heading become tubular, and the cavity cold-heading at two ends is communicated with;
S5, sleeve preformed, by cold-heading by head moulding in the middle of sleeve;
S6, sleeve forming, by flange, flower tooth and the middle head at cold-heading molding sleeve both ends.
The mould structure of sleeve forming for a kind of automobile, comprise the punch die and the main mould that are fixed on cold header, described punch die comprises punch die shell, be provided with punch die packing ring in punch die shell inside, be provided with punch die cushion block in the inside of punch die packing ring, described main mould comprises cushion block after main mould thimble, be positioned at the main formwork on cushion block after main mould thimble, described punch die also comprises punch die three thimbles that are positioned on punch die cushion block, be positioned at the punch die three thimble cushion blocks on punch die packing ring, be positioned at the die block on punch die three thimble cushion blocks, be fixed on the punch die thimble on punch die three thimble cushion blocks, and be positioned at the punch die ejector sleeve of die block inside, described punch die three thimbles prop up punch die ejector sleeve through punch die three thimble cushion blocks, described main mould comprises and is positioned at after main mould thimble the main mould three thimble cushion blocks of main formwork inside on cushion block, be positioned at the main mould thimble on main mould three thimble cushion blocks, be sleeved on the main mould ejector sleeve on main mould thimble, be positioned on main mould three thimble cushion blocks and be sleeved on the spring cushion block on main mould ejector sleeve, be positioned at the nitrogen spring of spring cushion block inside, prop up main mould three thimbles of main mould ejector sleeve through cushion block after main mould thimble and main mould three thimble cushion blocks, be positioned at three mould formworks on spring cushion block, be positioned at three moulds of three mould formwork inside and be positioned at three moulded boards of main mould at three mould formwork tops.
Further, in order to facilitate punch die three thimbles to promote punch die ejector sleeve, between described punch die three thimbles and punch die ejector sleeve, be provided with punch die ejector sleeve cushion block.
Further concrete, described punch die three thimble cushion blocks are provided with the punch die thimble fixed head for stationary rivet die thimble.
Further, in order to facilitate main mould three thimbles to promote main mould ejector sleeve, between described main mould three thimbles and main mould ejector sleeve, be provided with main mould ejector sleeve cushion block.
Further concrete, described main mould three thimble cushion blocks are provided with the main mould thimble fixed head for fixing main mould thimble.
Further, in order to facilitate being connected between three moulds and three mould formworks, between three described moulds and three mould formworks, be provided with three mould removable pins.
Further, in order to facilitate being connected between three mould formworks and main formwork, between three described mould formworks and main formwork, be provided with main mould removable pin.
The invention has the beneficial effects as follows: after adopting said method and mould structure, utilize cold-heading technology to complete all sizes, comprise flange and the flower tooth at the spherical and sleeve both ends of sleeve inner and outside, do not need to empty operation, save material, product streamline is good, good looking appearance, and mechanical performance is high, save the time of machining, reduced processing cost, improved production efficiency, the product of producing can meet international standards.
Brief description of the drawings
Fig. 1 is the schematic diagram of sleeve cold-heading molding process of the present invention;
Fig. 2 is the mould structure schematic diagram of the pre-cold-heading of the present invention;
Fig. 3 is the mould structure schematic diagram of degree of depth cold-heading of the present invention;
Fig. 4 is the mould structure schematic diagram that cold-heading of the present invention becomes tubular;
Fig. 5 is the preformed mould structure schematic diagram of sleeve of the present invention;
Fig. 6 is the mould structure schematic diagram of sleeve forming of the present invention.
201,301,401,501,601, punch die in figure:; 202,302,402,502,602, main mould; 203,406,616, punch die thimble; 204,305,405,505,612, main mould thimble; 205,303,608, cushion block after main mould thimble; 304,403,503,609, main mould three thimbles; 306,506,615, punch die ejector sleeve; 307,507,617, punch die ejector sleeve cushion block; 308,508,618, punch die three thimbles; 404,504,611, main mould ejector sleeve; 603, punch die three thimble cushion blocks; 604, die block; 605, three moulded boards of main mould; 606, three moulds; 607, main formwork; 610, main mould three thimble cushion blocks; 613, spring cushion block; 614, three mould formworks; 619, punch die packing ring; 620, punch die shell; 621, punch die cushion block.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is explained in detail.
A cold-heading molding method for sleeve for automobile as shown in Figure 1, the step of the cold-heading molding method of described sleeve is:
S1, shearing wire rod;
S2, pre-cold-heading, be cavity by two inside cold-headings in end of wire rod; Its mould as shown in Figure 2;
S3, degree of depth cold-heading, deepen the cavity degree of depth wire rod cold-heading; Its mould as shown in Figure 3;
S4, cold-heading become tubular, and the cavity cold-heading at two ends is communicated with; Its mould as shown in Figure 4;
S5, sleeve preformed, by cold-heading by head moulding in the middle of sleeve; Its mould as shown in Figure 5;
S6, sleeve forming, by flange, flower tooth and the middle head at cold-heading molding sleeve both ends; Its mould as shown in Figure 6.
The mould structure of sleeve forming for a kind of automobile as shown in Figure 6, comprise the punch die 601 and the main mould 602 that are fixed on cold header, described punch die 601 comprises punch die shell 620, be provided with punch die packing ring 619 in punch die shell 620 inside, be provided with punch die cushion block 621 in the inside of punch die packing ring 619, described main mould 602 comprises cushion block 608 after main mould thimble, be positioned at the main formwork 607 on cushion block 608 after main mould thimble, described punch die 601 also comprises punch die three thimbles 618 that are positioned on punch die cushion block 621, be positioned at the punch die three thimble cushion blocks 603 on punch die packing ring 619, be positioned at the die block 604 on punch die three thimble cushion blocks 603, be fixed on the punch die thimble 616 on punch die three thimble cushion blocks 603, and be positioned at the punch die ejector sleeve 615 of die block 604 inside, described punch die three thimbles 618 prop up punch die ejector sleeve 615 through punch die three thimble cushion blocks 603, described main mould 602 comprises and is positioned at after main mould thimble the main mould three thimble cushion blocks 610 of main formwork 607 inside on cushion block 608, be positioned at the main mould thimble 612 on main mould three thimble cushion blocks 610, be sleeved on the main mould ejector sleeve 611 on main mould thimble 612, be positioned on main mould three thimble cushion blocks 610 and be sleeved on the spring cushion block 613 on main mould ejector sleeve 611, be positioned at the nitrogen spring of spring cushion block 613 inside, prop up main mould three thimbles 609 of main mould ejector sleeve 611 through cushion block after main mould thimble 608 and main mould three thimble cushion blocks 610, be positioned at three mould formworks 614 on spring cushion block 613, be positioned at three moulds 606 of three mould formwork 614 inside and be positioned at three moulded boards 605 of main mould at three mould formwork 614 tops, between described punch die three thimbles 618 and punch die ejector sleeve 615, be provided with punch die ejector sleeve cushion block 617, described punch die three thimble cushion blocks 603 are provided with the punch die thimble fixed head for stationary rivet die thimble 616, between described main mould three thimbles 609 and main mould ejector sleeve 611, be provided with main mould ejector sleeve cushion block, described main mould three thimble cushion blocks 610 are provided with the main mould thimble fixed head for fixing main mould thimble 612, between three described moulds 606 and three mould formworks 614, be provided with three mould removable pins, between described three mould formworks 614 and main formwork 607, be provided with main mould removable pin.
Cold headers used in the present invention are 24B6SL six mould six impact machine platforms, press 440 tons of the power, 40 per minute of speed of production made.
Each station is divided into punch die and main mould, wherein crosses mould and completed by clip as shown in Fig. 2-Fig. 6, and all moulds are all contained on cold headers.Mass motion and punch die thimble 203 are pushing away part and are entering in master cast chamber punch die 201 in the course of the work as shown in Figure 2; Main mould 202 is fixed on the machine, and after main mould thimble 204 and main mould thimble, cushion block 205, in motion, plays the effect of releasing part.Punch die 301 mass motion in the course of the work as shown in Figure 3, punch die three thimbles 308, punch die ejector sleeve 306 and punch die ejector sleeve cushion block 307 play relative motion in machine, in punch die 301 die cavities, play the effect that ejects part; Main mould thimble 305 is fixing, and after main mould three thimbles 304 and main mould thimble, cushion block 303, in motion, plays the effect of releasing part.As shown in Figure 4 punch die 401 in the course of the work mass motion and punch die thimble 406 pushing away part and entering in main mould 402 die cavities, wherein punch die thimble 406 hollows play the effect of waste material; Main mould thimble 405 is fixing, and main mould three thimbles 403 and main mould ejector sleeve 404, in motion, play the effect of releasing part.Punch die 501,601 mass motions in the course of the work as shown in Figure 5 and Figure 6, punch die three thimbles 508,618, punch die ejector sleeve 506,615 and punch die ejector sleeve cushion block 507,617 play relative motion in machine, in punch die 501,601 die cavities, play the effect that ejects part; Main mould thimble 505,612 is fixing, and main mould three thimbles 503,609 and main mould ejector sleeve 504,611, in motion, play the effect of releasing part.
Acting as of its every station: wire rod (wire rod) is cut off and clipped to precooling upsetting station by clip and carry out pre-forward extrusion aperture by scissors.Workpiece is clipped to forward extrusion aperture after degree of depth cold-heading station, preformed endoporus by clip upset.Clip clips to cold-heading and becomes main stamping iron core after tubular station, becomes hollow pipe.Sleeve preformed station punch die is restrainted bar footpath, bar moulding two ends together with main mould, and middle upsetting globulate.Sleeve forming station adopts all sizes of folding mould guard aperture essence upsetting, ball-type in the middle of upsetting two head flanges and flower tooth and moulding.
It is emphasized that: be only preferred embodiment of the present invention above, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (8)
1. a cold-heading molding method for sleeve for automobile, is characterized in that: the step of the cold-heading molding method of described sleeve is:
S1, shearing wire rod;
S2, pre-cold-heading, be cavity by two inside cold-headings in end of wire rod;
S3, degree of depth cold-heading, deepen the cavity degree of depth wire rod cold-heading;
S4, cold-heading become tubular, and the cavity cold-heading at two ends is communicated with;
S5, sleeve preformed, by cold-heading by head moulding in the middle of sleeve;
S6, sleeve forming, by flange, flower tooth and the middle head at cold-heading molding sleeve both ends.
2. the mould structure of an automobile use sleeve forming, comprise the punch die (601) and the main mould (602) that are fixed on cold header, described punch die (601) comprises punch die shell (620), be provided with punch die packing ring (619) in punch die shell (620) inside, be provided with punch die cushion block (621) in the inside of punch die packing ring (619), described main mould (602) comprises cushion block (608) after main mould thimble, be positioned at the main formwork (607) on cushion block (608) after main mould thimble, it is characterized in that: described punch die (601) also comprises punch die three thimbles (618) that are positioned on punch die cushion block (621), be positioned at the punch die three thimble cushion blocks (603) on punch die packing ring (619), be positioned at the die block (604) on punch die three thimble cushion blocks (603), be fixed on the punch die thimble (616) on punch die three thimble cushion blocks (603), and be positioned at the inner punch die ejector sleeve (615) of die block (604), described punch die three thimbles (618) prop up punch die ejector sleeve (615) through punch die three thimble cushion blocks (603), described main mould (602) comprises and is positioned at the inner main mould three thimble cushion blocks (610) of the upper main formwork (607) of cushion block (608) after main mould thimble, be positioned at the main mould thimble (612) on main mould three thimble cushion blocks (610), be sleeved on the main mould ejector sleeve (611) on main mould thimble (612), be positioned on main mould three thimble cushion blocks (610) and be sleeved on the spring cushion block (613) on main mould ejector sleeve (611), be positioned at the inner nitrogen spring of spring cushion block (613), prop up main mould three thimbles (609) of main mould ejector sleeve (611) through cushion block (608) after main mould thimble and main mould three thimble cushion blocks (610), be positioned at the three mould formworks (614) on spring cushion block (613), be positioned at inner three moulds (606) of three mould formworks (614) and be positioned at three moulded boards of main mould (605) at three mould formworks (614) top.
3. the mould structure of sleeve forming for automobile according to claim 2, is characterized in that: between described punch die three thimbles (618) and punch die ejector sleeve (615), be provided with punch die ejector sleeve cushion block (617).
4. the mould structure of sleeve forming for automobile according to claim 2, is characterized in that: described punch die three thimble cushion blocks (603) are provided with the punch die thimble fixed head for stationary rivet die thimble (616).
5. the mould structure that will remove the automobile sleeve forming described in 2 according to right, is characterized in that: between described main mould three thimbles (609) and main mould ejector sleeve (611), be provided with main mould ejector sleeve cushion block.
6. the mould structure of sleeve forming for automobile according to claim 2, is characterized in that: described main mould three thimble cushion blocks (610) are provided with the main mould thimble fixed head for fixing main mould thimble (612).
7. the mould structure of sleeve forming for automobile according to claim 2, is characterized in that: between described three moulds (606) and three mould formworks (614), be provided with three mould removable pins.
8. the mould structure of sleeve forming for automobile according to claim 2, is characterized in that: between described three mould formworks (614) and main formwork (607), be provided with main mould removable pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108429.2A CN103831390A (en) | 2014-03-24 | 2014-03-24 | Cold heading forming method of car sleeve and mould structure for sleeve forming |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108429.2A CN103831390A (en) | 2014-03-24 | 2014-03-24 | Cold heading forming method of car sleeve and mould structure for sleeve forming |
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| CN103831390A true CN103831390A (en) | 2014-06-04 |
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| CN201410108429.2A Pending CN103831390A (en) | 2014-03-24 | 2014-03-24 | Cold heading forming method of car sleeve and mould structure for sleeve forming |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209446A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Cold upsetting module and cold upsetting process for manufacturing flange sleeve |
| CN104209444A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Oil pipe joint cold heading device and production technology thereof |
| CN104209445A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Cold-heading device for irregular knurling sleeve and production technique of cold-heading device |
| CN104325064A (en) * | 2014-11-06 | 2015-02-04 | 苏州工业园区新凯精密五金有限公司 | Cold heading forming technology for balancing weight and die structure for pre-heading large step |
| CN104439029A (en) * | 2014-09-15 | 2015-03-25 | 浙江超凡新材科技有限公司 | Cold-upsetting manufacturing technology for hollow flange rotary shaft |
| CN105750475A (en) * | 2016-03-04 | 2016-07-13 | 浙江机电职业技术学院 | Plastic forming method of semi-hollow shaft pin |
| CN108057839A (en) * | 2017-12-14 | 2018-05-22 | 苏州工业园区新凯精密五金有限公司 | It is a kind of for the cold-heading molding technique of automobile steering system casing and cold-heading module |
| CN109079084A (en) * | 2018-09-28 | 2018-12-25 | 嘉善宝岛模具厂(普通合伙) | A kind of connecting fork or section fork cold-heading cold-forge forming mold and its moulding process |
| CN109226655A (en) * | 2018-10-26 | 2019-01-18 | 广州小出钢管有限公司 | A kind of processing method of the automobile shock flat recess with tooth flanged pipe |
| CN109382634A (en) * | 2018-11-09 | 2019-02-26 | 宾科汽车紧固件（昆山）有限公司 | The shaping mechanism and forming method of electronic parking adjusting nut |
| CN109514189A (en) * | 2018-11-12 | 2019-03-26 | 广州小出钢管有限公司 | A kind of eccentric processing method with tooth rectangular tube of automobile shock |
| CN109894568A (en) * | 2019-03-08 | 2019-06-18 | 宁波安拓实业有限公司 | The automobile chassis welding manufacturing method of casing |
| CN110280704A (en) * | 2019-07-08 | 2019-09-27 | 苏州孚莱博精密金属科技有限公司 | It is a kind of for manufacturing the cold heading die group and cold heading technique of dampener sleeve |
| CN110788264A (en) * | 2019-08-26 | 2020-02-14 | 上海华鞍汽车配件有限公司 | Cold-heading full-size forming process for polygonal special-shaped ultrathin welding spot cushion block |
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| JP2003245746A (en) * | 2002-02-22 | 2003-09-02 | Cleartec:Kk | Cold forging equipment for crown gear |
| US20110061434A1 (en) * | 2009-09-17 | 2011-03-17 | National Machinery Llc | Point forming processes |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209444A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Oil pipe joint cold heading device and production technology thereof |
| CN104209445A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Cold-heading device for irregular knurling sleeve and production technique of cold-heading device |
| CN104209446B (en) * | 2014-08-15 | 2016-06-01 | 宾科汽车紧固件（昆山）有限公司 | A kind of cold-heading module for the manufacture of flange sleeve and cold heading technique |
| CN104209446A (en) * | 2014-08-15 | 2014-12-17 | 宾科汽车紧固件（昆山）有限公司 | Cold upsetting module and cold upsetting process for manufacturing flange sleeve |
| CN104439029A (en) * | 2014-09-15 | 2015-03-25 | 浙江超凡新材科技有限公司 | Cold-upsetting manufacturing technology for hollow flange rotary shaft |
| CN104325064A (en) * | 2014-11-06 | 2015-02-04 | 苏州工业园区新凯精密五金有限公司 | Cold heading forming technology for balancing weight and die structure for pre-heading large step |
| CN105750475A (en) * | 2016-03-04 | 2016-07-13 | 浙江机电职业技术学院 | Plastic forming method of semi-hollow shaft pin |
| CN108057839B (en) * | 2017-12-14 | 2024-01-12 | 苏州新凯紧固系统有限公司 | Cold heading forming process and cold heading module for automobile steering system sleeve |
| CN108057839A (en) * | 2017-12-14 | 2018-05-22 | 苏州工业园区新凯精密五金有限公司 | It is a kind of for the cold-heading molding technique of automobile steering system casing and cold-heading module |
| CN109079084A (en) * | 2018-09-28 | 2018-12-25 | 嘉善宝岛模具厂(普通合伙) | A kind of connecting fork or section fork cold-heading cold-forge forming mold and its moulding process |
| CN109079084B (en) * | 2018-09-28 | 2023-08-15 | 嘉善宝岛模具厂(普通合伙) | Cold upsetting and cold forging forming die for connecting fork or joint fork and forming process thereof |
| CN109226655A (en) * | 2018-10-26 | 2019-01-18 | 广州小出钢管有限公司 | A kind of processing method of the automobile shock flat recess with tooth flanged pipe |
| CN109382634A (en) * | 2018-11-09 | 2019-02-26 | 宾科汽车紧固件（昆山）有限公司 | The shaping mechanism and forming method of electronic parking adjusting nut |
| CN109514189A (en) * | 2018-11-12 | 2019-03-26 | 广州小出钢管有限公司 | A kind of eccentric processing method with tooth rectangular tube of automobile shock |
| CN109894568A (en) * | 2019-03-08 | 2019-06-18 | 宁波安拓实业有限公司 | The automobile chassis welding manufacturing method of casing |
| CN109894568B (en) * | 2019-03-08 | 2020-04-14 | 宁波安拓实业有限公司 | Manufacturing method of sleeve for welding automobile chassis |
| CN110280704A (en) * | 2019-07-08 | 2019-09-27 | 苏州孚莱博精密金属科技有限公司 | It is a kind of for manufacturing the cold heading die group and cold heading technique of dampener sleeve |
| CN110788264A (en) * | 2019-08-26 | 2020-02-14 | 上海华鞍汽车配件有限公司 | Cold-heading full-size forming process for polygonal special-shaped ultrathin welding spot cushion block |
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Application publication date: 20140604 |