CN104475579B - For particular manufacturing craft and the process for stamping of crooked part in punching press - Google Patents
For particular manufacturing craft and the process for stamping of crooked part in punching press Download PDFInfo
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- CN104475579B CN104475579B CN201410715647.2A CN201410715647A CN104475579B CN 104475579 B CN104475579 B CN 104475579B CN 201410715647 A CN201410715647 A CN 201410715647A CN 104475579 B CN104475579 B CN 104475579B
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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
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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
- 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
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- Mechanical Engineering (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A kind of particular manufacturing craft for crooked part in punching press and process for stamping are provided, be provided with the first die assembly and the second die assembly, the first die assembly is utilized accurately to be bent out by blank bottom roundings, utilize the second die assembly blank to be bent to when ensureing that bottom roundings is constant the part shape meeting dimensional requirement, there is very high practical value.
Description
Technical field
The invention belongs to Stamping Die Technology field, be specifically related to a kind of particular manufacturing craft for crooked part in punching press and process for stamping.
Background technology
Existing teaching material, Specialty Design tool data, atlas case, great majority introduce classical U-shaped, V-arrangement,
shape, Hough
bend forming technique and the associated mold design such as shape.And shape is interior bending
the part of shape belongs to atypia polymorphic structure, and punching process character is poor, and stamping process program is difficult to formulate, and diel is also just difficult to design.This part is the special special elastic element of certain Large Scale Space Vehicle, and accessory size and processability of product structure can not change.Sheet Metal Forming Technology traditionally carries out Design of Dies,
shape bottom bend fillet position intensity is not enough, feature bottom fillet free forming, and fillet size mobility scale is large, and fillet is irregular, can not ensure product parts size.For interior bending
shape punching parts, Sheet Metal Forming Technology traditionally and Design of Dies, if male bottom stretches out shaping fillet, then punch-nose angle intensity is not enough, easily bursts apart in fillet position; If male bottom does not stretch out shaping fillet, crooked part fillet at certain limit free variation, will can not ensure product fillet size.In generally civilian, industry and other purposes, seldom see this kind of punching parts, belong to the part that punching process character is poor, this interior bending in production
shape punching parts, its process program is as follows with the mould related to: operation one: blanking, calculates Expand of Punching Parts Blank size, designing mould, blanking die; Operation two: v-shaped bending, bending two ends forming V-shape in bending, designing mould, bending die; Operation three: flatten, flattens two ends V-arrangement, designing mould, flattening die; Operation four: U-bend is bent, bent by figure U-bend, designing mould, bending die.Its designing mould method is: male bottom stretches out curved radius R0.8, and size is easy to ensure, but fatal shortcoming is, mold bending advocates to concentrate on curved radius R0.8 position, and this position is greatly stressed, and the fillet thickness that punch two ends are stretched out is by part drawing size
change within the scope of 0.6-1.4, the curved radius intensity of mould is low, and easy fracture damages, if the thickness stretching out shaping R0.8 reaches 1.8-2.5, intensity is much all right.Sheet Metal Forming Technology is routinely another kind of bending
the process program of shape, curved radius is free size, does not ensure curved radius size.Designing mould method is: punch manufactures by U-shaped insied width size design, do not consider base angle radius R 0.8, bottom radius is designed to right angle (note: R0.3 is the natural fillet at right angle), and spares bend fillet, at R0.8-R2.5 range changing, can not ensure product parts size.Sheet Metal Forming Technology routinely carries out the mould designed, and the common feature being bent part stress is that simply supported beam bends.Due to above-mentioned defect, use conventional stamping processes and Design of Dies, product parts size can not be ensured, be therefore necessary to propose to improve.
Summary of the invention
The technical problem that the present invention solves: a kind of particular manufacturing craft for crooked part in punching press and process for stamping are provided, be provided with the first die assembly and the second die assembly, utilizing the first die assembly accurately to be bent out by blank bottom roundings, utilizing the second die assembly blank to be bent to when ensureing that bottom roundings is constant the part shape meeting dimensional requirement.
The technical solution used in the present invention: for the particular manufacturing craft of crooked part in punching press, there is the first die assembly and the second die assembly, described first die assembly is dull and stereotyped and ejector under comprising punch I, die I, mould upper flat plate, fixed head, poppet, mould, and both sides, described punch I bottom are shaped with escape groove; Described second die assembly comprises punch II, die II, die shank II, die holder, lower bolster and crowbar,
Described punch II bottom is shaped with V-type changeover portion, described V-type changeover portion bottom is shaped with the straight portion section that is shaped, wherein side be shaped straight portion pars infrasegmentalis be shaped with tilt stamping section, the stamping pars infrasegmentalis of described inclination is shaped with vertical compression shaped segment, is shaped with shaping fillet bottom described vertical compression shaped segment.
Further, described fixed head is fixed on mould upper flat plate lower surface, described punch I is adaptive through the deep gouge on mold fixed plate and punch I upper end and fixed head, described die II is fixedly connected with flat board under poppet and described mould, described ejector is placed in poppet and is connected with through ejector pin contact dull and stereotyped under mould with in the through hole of die II and ejector bottom, and described mould upper flat plate upper surface is fixed with die shank I; Described punch II top is placed in die shank II endoporus and both are fixedly connected with, described punch II inner chamber is provided with pressing device and punch II lower surface is stretched out in pressing device lower end, backing plate is fixed on lower bolster upper surface, die holder is fixed on backing plate upper surface, described die II is placed in die holder and die II inner chamber is provided with ejector pin, described backing plate one end is shaped with fluting, described crowbar one end by fluting after withstand on ejector pin lower end, crowbar by straight pin and backing plate (19) hinged.
Further, described pressing device is made up of plug screw and spring, and described punch II inner chamber is screw, and described plug screw and screw adaptation, spring housing is contained in depression bar upper end and holds out against with plug screw lower surface, and punch II lower surface is stretched out in described depression bar lower end.
Further, described punch II upper end is shaped with flute profile cross through hole, and link plate crosses flute profile cross through hole, and screw screws through the screw hole on die shank II and link plate, and punch II and die shank II spline are located by horizontal straight pin; Described crowbar is made up of long-armed and galianconism and both are L-type structure, described galianconism is by withstanding on ejector pin lower end after fluting, described galianconism is articulated as one by straight pin and backing plate, described long-armed be free end and its underpart is provided with spring and alignment pin thereof, the blind hole adaptation that described spring and alignment pin thereof are shaped with when long-armed pressing down and on lower bolster.
The present invention also provides a kind of process for stamping for crooked part in punching press, comprises the steps:
1) blanking: calculate Expand of Punching Parts Blank size, utilize blanking die that blank is made;
2) v-shaped bending: utilize bending die by blank bending two ends good for punching press, make blank two ends forming V-shape structure;
3) U-shaped prebuckling: utilize the first die assembly to be become at two ends V-type to bend blank prebuckling, make blank bend to U-shaped structure, and the filleted corner of blank two ends contoured bottom is consistent with punch-nose angle;
4) bending in cantilever combination: to utilize the second die assembly the blank of U-shaped prebuckling to be carried out cantilever combination bending, when ensureing bottom filleted corner size constancy, blank being bent to the shape meeting dimensional requirement.
Above-mentioned steps 2) in, during the forming V-shape structure of blank two ends, its angle is 60 °.
The present invention's advantage compared with prior art:
1, the male bottom fillet intensity of the first die assembly is high, improves die life;
2, utilizing the first die assembly accurately to be bent out by blank bottom roundings, according to flexural loading analysis, utilizing the second die assembly blank to be bent to when ensureing that bottom roundings is constant the shape meeting dimensional requirement;
3, the present invention is according to flexural loading state analysis, except the blanking and V-type that carry out routine are bending, first die assembly that utilizes of novelty carries out U-shaped prebuckling, blank bottom roundings is accurately bent out, and then it is bending to utilize the second die assembly to carry out in cantilever combination, measuring and calculating and feasibility analysis analyzed and simulated by flexural loading, feature bottom curved radius and forming dimension precision accurately can be ensured.
Accompanying drawing explanation
Fig. 1 is the first die assembly structural representation of the present invention;
Fig. 2 is the second die assembly structural representation of the present invention;
Fig. 3 is the A-A sectional view of Fig. 2;
Fig. 4 is the B-B sectional view of Fig. 2;
Fig. 5 is blanking step schematic diagram of the present invention;
Fig. 6 is V-type bending step schematic diagram of the present invention;
Fig. 7 is U-shaped pre-bending step schematic diagram of the present invention;
Fig. 8 is bending step schematic diagram in cantilever of the present invention combination;
Fig. 9 is bending original state schematic diagram in cantilever of the present invention combination;
Figure 10 is the I portion enlarged drawing of Fig. 9;
Figure 11 is bending brake forming view in cantilever of the present invention combination;
Figure 12 is the II portion enlarged drawing of Figure 11;
Figure 13 is bending original state force analysis figure in cantilever of the present invention combination;
Figure 14 is bending intermediateness force analysis figure in cantilever of the present invention combination.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-14, embodiments of the invention are described.
For the particular manufacturing craft of crooked part in punching press, there is the first die assembly and the second die assembly, described first die assembly to comprise under punch I 1, die I 2, mould upper flat plate 3, fixed head 4, poppet 5, mould dull and stereotyped 6 and ejector 7, and both sides, described punch I 1 bottom are shaped with escape groove 9; Described second die assembly comprises punch II 12, die II 13, die shank II 14, die holder 15, lower bolster 16 and crowbar 17, described punch II 12 bottom is shaped with V-type changeover portion 20, described V-type changeover portion 20 bottom is shaped with the straight portion section 21 that is shaped, wherein side be shaped section 21 bottom, straight portion be shaped with tilt stamping section 22, described inclination stamping section of 22 bottoms are shaped with vertical compression shaped segment 23, are shaped with shaping fillet bottom described vertical compression shaped segment 23.
Above-mentioned fixed head 4 is fixed on mould upper flat plate 3 lower surface, described punch I 1 is adaptive through the deep gouge 8 on mold fixed plate 4 and punch I 1 upper end and fixed head 4, described die II 2 is fixedly connected with flat board 6 under poppet 5 and described mould, in the through hole that described ejector 7 is placed in poppet 5 and die II 2 and ejector 7 bottom contacts with through the push rod 10 of flat board 6 under mould and is connected, and described mould upper flat plate 3 upper surface is fixed with die shank I 11; Described punch II 12 top is placed in die shank II 14 endoporus and both are fixedly connected with, described punch II 12 inner chamber is provided with pressing device 18 and punch II 12 lower surface is stretched out in pressing device 18 lower end, specifically, pressing device 18 is made up of plug screw 27, spring 28, described punch II 12 inner chamber is screw, described plug screw 27 is adaptive with screw, and spring 28 is sleeved on depression bar 29 upper end and holds out against with plug screw 27 lower surface, and punch II 12 lower surface is stretched out in described depression bar 29 lower end.Backing plate 19 is fixed on lower bolster 16 upper surface, die holder 15 is fixed on backing plate 19 upper surface, described die II 13 is placed in die holder 15 and die II 13 inner chamber is provided with ejector pin 24, described backing plate 19 one end is shaped with fluting, described crowbar 17 one end is by withstanding on ejector pin 24 lower end after fluting, and crowbar 17 is hinged by straight pin 26 and backing plate 19.
Above-mentioned punch II 12 upper end is shaped with flute profile cross through hole 30, and link plate 31 crosses flute profile cross through hole 30, and screw screws through the screw hole 32 on die shank II14 and link plate 31, and punch II 12 and die shank II 14 spline are located by horizontal straight pin 33; Described crowbar 17 is made up of long-armed 34 and galianconism 35 and both are L-type structure, described galianconism 35 is by withstanding on ejector pin 24 lower end after fluting, described galianconism 35 is articulated as one by straight pin 26 and backing plate 19, described long-armed 34 is free end and its underpart is provided with spring and alignment pin 36 thereof, blind hole 25 adaptation that described spring and alignment pin 36 thereof are shaped with when long-armed 34 press down and on lower bolster 16.
The in-built rotating shaft straight pin 26 of crowbar 17, is assemblied in backing plate 19, is integrated with 19 one-tenth, backing plate, and can rotate by straight pin 26 around the shaft, ejector pin 24 can be made to move up, ejected by crooked part 37; Spring and alignment pin 36 thereof can make crowbar 17 reset to original state, so that the placement of part to be processed 37 and location; Alignment pin can make spring 36 locate, and is unlikely to come off.
A kind of process for stamping for crooked part in punching press is also provided, comprises the steps:
1) blanking: calculate Expand of Punching Parts Blank size, utilize blanking die that blank is made, shown in Fig. 5;
2) v-shaped bending: utilize bending die by blank bending two ends good for punching press, make blank two ends forming V-shape structure, shown in Fig. 6; During the forming V-shape structure of blank two ends, its angle is 60 °.
3) U-shaped prebuckling: utilize the first die assembly to be become at two ends V-type to bend blank prebuckling, make blank bend to U-shaped structure, and the filleted corner of blank two ends contoured bottom is consistent with punch-nose angle, shown in Fig. 7
4) bending in cantilever combination: to utilize the second die assembly the blank of U-shaped prebuckling to be carried out cantilever combination bending, when ensureing that bottom filleted corner is constant, blank being bent to the shape meeting dimensional requirement, shown in Fig. 8.
U-shaped prebuckling simulation measuring and calculating and the interior bending mould force analysis of cantilever combination, design feasibility analysis:
1.V shape angle of bend is on the impact of the punch strength of the U-shaped prebuckling of rear operation, when v-shaped bending angle is by 45 ° to 60 ° variations, the thickness of pre-bending bottom bend fillet R0.8 thickeies gradually, intensity improves gradually, but the shelves of opening that both sides bend rear centre reduce gradually, make the middle part of rear operation U-shaped prebuckling punch thinning, punch strength reduces on the contrary, reduce the binder spacing of U-shaped prebuckling punch pressing device, through simulation measuring and calculating, 60 ° relatively better, and bottom bend fillet and middle reinforced rib are all taken into account (shown in Fig. 6).
2. flexural loading analysis and design feasibility analysis in pair cantilever combination, workpiece 37 is bending original state in cantilever combination, and before punch II 12 crooked part 37, the depression bar 29 of pressing device 18 first compresses bottom part 37, F3 is the thrust of pressing device 18, and F4 is the reaction force of ejector pin 24; When punch II 12 is descending, stamping press acts on part 37, produce normal pressure F1, maximal bending moment is produced at the bending part A point of part 37, make part 37 around the flexural deformation of A point, produce reaction force F2, as fulcrum at the position B point of die II 13 curved radius, produce maximal bending moment, make workpiece 37 around the flexural deformation of B point; Under normal pressure F1 effect, workpiece 37 with B point for fulcrum, make sidewall, bottom produces the trend rotated up, F3 is the thrust of pressing device 18 is exactly the reaction force balancing this trend, and workpiece 37 is stablized in die II 13 positioned internal, ensure the stable and dimensional accuracy of part 37 compact dimensions, on the right side of part 37 stressed bending in like manner; Because part 37 bottom bend fillet relative material thickness is smaller, rigidity and intensity good, point active force downwards that stamping press produces at part 37 sidewall, is not enough to the bottom roundings R0.8 of brake forming to change; When punch II 12 is stamped into the end, orthopedic, sizing is carried out to all brake forming positions.The loading characteristic of this workpiece 37 in the second die assembly is, in little space, bending in floating, cantilever combines, as shown in Figure 13, Figure 14.
3. actual die trial part is higher than import exemplar dimensionally stable, precision, and especially bottom roundings is better than import exemplar, and import exemplar bottom roundings does not ensure, is the non-cylindrical curved surface of torsional deformation.In actual production, the reasonability of Design of Dies, advanced directly determine institute's manufactured parts quality and production efficiency and production cost, equally, the manufacturability quality of product parts design determines the feasibility of Design of Dies and the complexity of Design of Dies and processing.
The present invention is by internally bending
shape punching parts carries out the force analysis of stamping process program, and a kind of Sheet Metal Forming Technology method of innovative design, improves the male bottom fillet intensity of bending mould, improve die life; By innovation prebuckling process and Design of Dies, carry out prebuckling and combine bending simulation measuring and calculating and feasibility analysis, ensureing spares bend fillet dimensional accuracy, innovation prebuckling, the bending Sheet Metal Forming Technology method of combination and Design of Dies.
Above-described embodiment, just preferred embodiment of the present invention, is not used for limiting the scope of the present invention, therefore all equivalence changes done with content described in the claims in the present invention, all should be included within the claims in the present invention scope.
Claims (6)
1. for the particular manufacturing craft of crooked part in punching press, there is the first die assembly and the second die assembly, it is characterized in that: described first die assembly is dull and stereotyped (6) and ejector (7) under comprising punch I (1), die I (2), mould upper flat plate (3), fixed head (4), poppet (5), mould, and described punch I (1) both sides, bottom are shaped with escape groove (9), described second die assembly comprises punch II (12), die II (13), die shank II (14), die holder (15), lower bolster (16) and crowbar (17), described punch II (12) bottom is shaped with V-type changeover portion (20), described V-type changeover portion (20) bottom is shaped with straight portion section (21) that is shaped, wherein side be shaped section (21) bottom, straight portion be shaped with tilt stamping section (22), described inclination stamping section of (22) bottom is shaped with vertical compression shaped segment (23), described vertical compression shaped segment (23) bottom is shaped with shaping fillet.
2. the particular manufacturing craft for crooked part in punching press according to claim 1, it is characterized in that: described fixed head (4) is fixed on mould upper flat plate (3) lower surface, the deep gouge (8) of described punch I (1) through mold fixed plate (4) and on punch I (1) upper end and fixed head (4) is adaptive, described die II (2) is fixedly connected with dull and stereotyped (6) under poppet (5) and described mould, in the through hole that described ejector (7) is placed in poppet (5) and die II (2) and ejector (7) bottom contacts with through the push rod (10) of flat board (6) under mould and is connected, described mould upper flat plate (3) upper surface is fixed with die shank I (11), described punch II (12) top is placed in die shank II (14) endoporus and both are fixedly connected with, described punch II (12) inner chamber is provided with pressing device (18) and punch II (12) lower surface is stretched out in pressing device (18) lower end, backing plate (19) is fixed on lower bolster (16) upper surface, die holder (15) is fixed on backing plate (19) upper surface, described die II (13) is placed in die holder (15) and die II (13) inner chamber is provided with ejector pin (24), described backing plate (19) one end is shaped with fluting, described crowbar (17) one end is by withstanding on ejector pin (24) lower end after fluting, crowbar (17) is hinged by straight pin (26) and backing plate (19).
3. the particular manufacturing craft for crooked part in punching press according to claim 2, it is characterized in that: described pressing device (18) is made up of plug screw (27), spring (28), described punch II (12) inner chamber is screw, described plug screw (27) is adaptive with screw, spring (28) is sleeved on depression bar (29) upper end and holds out against with plug screw (27) lower surface, and punch II (12) lower surface is stretched out in described depression bar (29) lower end.
4. the particular manufacturing craft for crooked part in punching press according to claim 2, it is characterized in that: described punch II (12) upper end is shaped with flute profile cross through hole (30), link plate (31) crosses flute profile cross through hole (30), screw screws through die shank II (14) and the screw hole (32) on link plate (31), and punch II (12) and die shank II (14) spline are located by horizontal straight pin (33); Described crowbar (17) is made up of long-armed (34) and galianconism (35) and both are L-type structure, described galianconism (35) is by withstanding on ejector pin (24) lower end after fluting, described galianconism (35) is articulated as one by straight pin (26) and backing plate (19), described long-armed (34) are for free end and its underpart is provided with spring and alignment pin (36) thereof, and the blind hole (25) that described spring and alignment pin (36) thereof are shaped with when long-armed (34) press down and on lower bolster (16) is adaptive.
5. use the process for stamping of crooked part in particular manufacturing craft punching press as claimed in claim 1, it is characterized in that comprising the steps:
1) blanking: calculate Expand of Punching Parts Blank size, utilize blanking die that blank is made;
2) v-shaped bending: utilize bending die by blank bending two ends good for punching press, make blank two ends forming V-shape structure;
3) U-shaped prebuckling: utilize the first die assembly to be become at two ends V-type to bend blank prebuckling, make blank bend to U-shaped structure, and the filleted corner of blank two ends contoured bottom is consistent with punch-nose angle;
4) bending in cantilever combination: to utilize the second die assembly the blank of U-shaped prebuckling to be carried out cantilever combination bending, when ensureing that bottom filleted corner is constant, blank being bent to the shape meeting dimensional requirement.
6. the process for stamping for crooked part in punching press according to claim 5, is characterized in that: above-mentioned steps 2) in, during the forming V-shape structure of blank two ends, its angle is 60 °.
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| CN201410715647.2A CN104475579B (en) | 2014-11-28 | 2014-11-28 | For particular manufacturing craft and the process for stamping of crooked part in punching press |
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| CN201410715647.2A CN104475579B (en) | 2014-11-28 | 2014-11-28 | For particular manufacturing craft and the process for stamping of crooked part in punching press |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268847A (en) * | 2015-10-10 | 2016-01-27 | 中航飞机股份有限公司西安飞机分公司 | Bending die and method for acute-angle groove-shaped sheet metal part |
| CN105268850B (en) * | 2015-10-27 | 2018-01-05 | 亿和精密工业（苏州）有限公司 | One kind rotation centering block bending material removing mechanism |
| CN106077287B (en) * | 2016-06-22 | 2018-02-16 | 苏州天朋精密元器件有限公司 | A kind of diel |
| CN109909378A (en) * | 2019-03-21 | 2019-06-21 | 安徽省矿业机电装备有限责任公司 | A method of for batch micro operations snap ring |
| CN109794550A (en) * | 2019-03-21 | 2019-05-24 | 安徽省矿业机电装备有限责任公司 | Manufacture system for snap ring |
| CN110064703A (en) * | 2019-05-05 | 2019-07-30 | 上海沪工汽车电器有限公司 | The dedicated reed profile angle adjustment mechanism of relay and method of adjustment |
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| JPS61222638A (en) * | 1985-03-27 | 1986-10-03 | Honda Motor Co Ltd | Edge bending device |
| JP2001246418A (en) * | 2000-03-06 | 2001-09-11 | Kanto Auto Works Ltd | Press die for edge bending |
| CN101347808A (en) * | 2008-08-25 | 2009-01-21 | 重庆长安汽车股份有限公司 | Flanging mold for workpiece with U-shaped end head |
| CN202377338U (en) * | 2011-12-14 | 2012-08-15 | 苏州全信金属成型有限公司 | Novel negative angle bending device |
| CN102688941A (en) * | 2012-06-01 | 2012-09-26 | 苏州旭创精密模具有限公司 | Terminal die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101406916B (en) * | 2008-12-05 | 2011-06-01 | 崔学君 | Method for producing S type flanging of metal heat-insulating protecting component |
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|---|---|---|---|---|
| JPS61222638A (en) * | 1985-03-27 | 1986-10-03 | Honda Motor Co Ltd | Edge bending device |
| JP2001246418A (en) * | 2000-03-06 | 2001-09-11 | Kanto Auto Works Ltd | Press die for edge bending |
| CN101347808A (en) * | 2008-08-25 | 2009-01-21 | 重庆长安汽车股份有限公司 | Flanging mold for workpiece with U-shaped end head |
| CN202377338U (en) * | 2011-12-14 | 2012-08-15 | 苏州全信金属成型有限公司 | Novel negative angle bending device |
| CN102688941A (en) * | 2012-06-01 | 2012-09-26 | 苏州旭创精密模具有限公司 | Terminal die |
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| CN104475579A (en) | 2015-04-01 |
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