CN102371309B - Deep drawing forming composite die for shallow conical pieces with sunken side walls - Google Patents
Deep drawing forming composite die for shallow conical pieces with sunken side walls Download PDFInfo
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- CN102371309B CN102371309B CN 201010262951 CN201010262951A CN102371309B CN 102371309 B CN102371309 B CN 102371309B CN 201010262951 CN201010262951 CN 201010262951 CN 201010262951 A CN201010262951 A CN 201010262951A CN 102371309 B CN102371309 B CN 102371309B
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Abstract
The invention discloses a deep drawing forming composite die for shallow conical pieces with sunken side walls, and relates to a deep drawing forming composite die. The problem that the conventional die is difficult in forming the shallow conical pieces with the sunken side walls is solved. The upper end of a guide sleeve is in sliding fit with a guide post, and the lower end of the guide sleeve is in interference fit with a lower guide post hole of a lower template; a blanking female die is arranged on the lower template; an upper convex-concave die is connected with a fixed plate; a backing ring is positioned between an upper template and the fixed plate; the upper convex-concave die is placed in the blanking female die; a spring and a baffle pin are arranged in circular bead through holes of the blanking female die; a limiting screw is arranged on the lower template; an ejection plate is arranged in the backing ring; a stripping rod is arranged on the backing ring; a punching male die fixed plate and a shim plate are arranged in the upper convex-concave die; a punching male die is arranged in a lower convex-concave die; the lower convex-concave die is arranged in a profile hole of the upper convex-concave die; a return plate is sleeved on the punching male die; a blank holder is sleeved on the lower convex-concave die; and a side pressing rubber pad and a supporting plate are sleeved on a solenoid. The die is used for deep drawing forming of the shallow conical pieces with the sunken side walls.
Description
Technical field
The present invention relates to a kind of drawing and forming composite die.
Background technology
Sheet Metal Forming Technology is to use forcing press by mould metal blank to be pressurizeed, and makes it produce plastic deformation, thereby obtains the part of definite shape, size and performance, and it is one of processing method important in the machine-building.The part kind of utilizing process for stamping to produce is a lot, and its forming method is also varied, summarizes by moulding operation kind and divides two big classes: the one, and separating technology; The 2nd, moulding process.Moulding process is meant under the condition of not destroying material, makes material generation plastic deformation, thereby obtains the product of required form and size.Deep-drawing technique belongs to a kind of of moulding process, and deep-drawing technique is divided into following several again: 1, Cylindrical Drawing Parts; 2, ladder parts pull and stretch; 3, spherical parts pull and stretch; 4, parabola shaped pull and stretch; 5, rectangular-shaped piece pull and stretch; 6, Tapered Cup Drawing etc.Wherein Tapered Cup Drawing is one of the most difficult pull and stretch.Tapered Cup Drawing is divided following three kinds of situations again, and 1, shallow Tapered Cup Drawing; 2, moderate depth Tapered Cup Drawing; 3, dark Tapered Cup Drawing.The Tapered Cup Drawing that all works are discussed is no matter be which kind of Tapered Cup is meant that all bus is the Tapered Cup of straight line.The pull and stretch of Tapered Cup, the position of its deformed area, stressing conditions, deformation characteristics etc. are all different with cylindrical component, so the variety of issue that occurs in the pull and stretch is all different with cylindrical component with the method that addresses these problems.There is following problem in moulding to Tapered Cup Drawing to adopt existing mold: punch and blank contact area are little, pressure is concentrated, cause local attenuation easily; Free area is big during Tapered Cup Drawing, the blank holder effect is little, easy wrinkling not easy-formation, especially to the more difficult drawing and forming of shallow Tapered Cup with indent sidewall (the shallow Tapered Cup that what is called has an indent sidewall is meant the part of the workpiece sidewall after the moulding to axis of workpiece direction depression, and the external diameter ratio of the relative workpiece of workpiece height port is less).
Summary of the invention
The purpose of this invention is to provide a kind of shallow Tapered Cup Drawing moulding composite die, adopt existing mold to be difficult to the problem that drawing and forming has the shallow Tapered Cup of indent sidewall to solve with indent sidewall.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: a kind of shallow Tapered Cup Drawing moulding composite die with indent sidewall of the present invention is made up of upper die component and following membrane module; Upper die component comprises die shank, cope match-plate pattern, two guide pin bushings, gasket ring, fixed head, knockout rod, top board, discharging connector, backing plate, piercing punch, piercing punch fixed heads, goes up punch-die, moves back part plate and threaded connector; Following membrane module is made up of supporting pin, lower bolster, two guide pillars, blanking die, stripper, following punch-die, pin stop, blank holder, spring, supporting pin, spacing screw rod, screwed pipe, supporting plate and one group of flanging valve rubber; The lower end and the cope match-plate pattern of die shank removably connect, be arranged with two upper guide post holes with respect to its central axis on the cope match-plate pattern, guide pin bushing with its interference fit is housed in each upper guide post hole of cope match-plate pattern, two guide pin bushings and two corresponding one by one settings of guide pillar, the upper end of guide pillar and the inwall of guide pin bushing are slidingly matched, be provided with two following guide pillar holes with two guide pillar opposite position places on the lower bolster, the following guide pillar hole interference fit of the lower end of guide pillar and lower bolster, blanking die is arranged on the upper surface of lower bolster and the two removably connects, last punch-die and fixed head all are arranged on the below of cope match-plate pattern, fixed head is provided with center shoulder connecting hole, the upper end of last punch-die is arranged on interior and the two interference fit of center shoulder connecting hole of fixed head, gasket ring is arranged between cope match-plate pattern and the fixed head, fixed head, gasket ring and cope match-plate pattern three removably connect, stripper is provided with central through hole, blanking die is provided with the center cavity, the central through hole that stripper is passed in the lower end of last punch-die is arranged in the center cavity of blanking die, blanking die is provided with the shoulder through hole, spring is arranged in the shoulder through hole of blanking die, cope match-plate pattern, gasket ring, fixed head is connected by the discharging connector with stripper, pin stop is arranged in the shoulder through hole of blanking die, spacing screw rod is installed on the lower bolster, and the upper end of spacing screw rod is arranged in the shoulder through hole of blanking die, spring is spacing by pin stop and spacing screw axial, gasket ring is provided with central shaft hole, top board is arranged in the central shaft hole of gasket ring, the lower end of knockout rod is passed on the upper surface that die shank is arranged on gasket ring, the upper surface of last punch-die is provided with center shoulder installing hole, the lower surface of last punch-die is provided with the type hole that communicates with this center shoulder installing hole, the type hole is from top to bottom successively by the first circular platform type hole, the second circular platform type hole, the 3rd circular platform type hole and cylindrical hole are formed, the aperture, lower end in the second circular platform type hole is greater than the aperture, lower end in the first circular platform type hole, the aperture, lower end in the 3rd circular platform type hole is greater than the aperture, lower end in the second circular platform type hole, the aperture, lower end in the 3rd circular platform type hole equates with the aperture of cylindrical hole, with the corresponding sidewall of going up punch-die in the 3rd circular platform type hole be indent circular arc sidewall, the angle of cut between the lower end in type hole and the epirelief bottom of female die face is a fillet, piercing punch fixed head and backing plate are arranged on the interior gasket ring axial limiting that also passes through of center shoulder installing hole of punch-die from the bottom to top, the piercing punch fixed head is connected by threaded connector with backing plate, and the upper end of threaded connector leans on the lower surface of top board, the piercing punch fixed head is provided with piercing punch mounting center hole, the upper end of piercing punch is arranged in the piercing punch mounting center hole, following punch-die is provided with piercing punch and connects centre bore, the piercing punch that the lower end of piercing punch is arranged on down punch-die connects in the centre bore, the upper end conformal of following punch-die is arranged in the type hole of punch-die, cavity between following punch-die and the last punch-die is a die cavity, following punch-die and lower bolster removably connect, move back that the part sleeve-board is contained on the piercing punch and down between punch-die and the piercing punch fixed head, blank holder is sleeved on down on the lateral wall of punch-die and between last punch-die and lower bolster, the upper end of screwed pipe is threaded with lower bolster, one group of flanging valve rubber and two supporting plates are sleeved on the screwed pipe, and one group of flanging valve rubber is arranged on up and down between two supporting plates, one group of flanging valve rubber and two supporting plates all removably connect with screwed pipe, the lower surface of blank holder leans on the upper surface of supporting pin, the lower end of supporting pin is passed lower bolster and is leaned on supporting plate, screwed pipe and following punch-die, the coaxial setting of last punch-die and knockout rod.
The present invention has following beneficial effect: the present invention can be with blanking, pull and stretch, punching, squeeze five processes such as limit, the correction once-combined drawing and forming that be combined with each other goes out to have the shallow Tapered Cup of concave side wall, and the ratio of the height H of the shallow Tapered Cup after the moulding and port outer diameter D is in 0.1～0.25 scope.The present invention has not only improved production efficiency, has guaranteed product quality, and the part after the processing can be directly used in assembling simultaneously.
Description of drawings
Fig. 1 is an integrally-built main cutaway view of the present invention, and Fig. 2 is a main cutaway view of going up punch-die 17, and Fig. 3 is the front view of the workpiece (the shallow Tapered Cup with indent sidewall) that utilizes composite die of the present invention to mold.
The specific embodiment
The specific embodiment one: in conjunction with Fig. 1-Fig. 3 explanation, a kind of shallow Tapered Cup Drawing moulding composite die with indent sidewall of present embodiment is made up of upper die component and following membrane module; Upper die component comprises die shank 16, cope match-plate pattern 12, two guide pin bushings 10, gasket ring 14, fixed head 11, knockout rod 18, top board 20, discharging connector 22, backing plate 23, piercing punch 24, piercing punch fixed heads 25, goes up punch-die 17, moves back part plate 31 and threaded connector 21; Following membrane module is by supporting pin 2, lower bolster 5, two guide pillars 6, blanking die 7, strippers 8, punch-die 4, pin stop 26, blank holder 29, spring 27, supporting pin 2, spacing screw rod 30, screwed pipe 33, supporting plate 35 and one group of flanging valve rubber 1 are formed down; The lower end of die shank 16 removably connect with cope match-plate pattern 12 (in the present embodiment adopt be threaded), be arranged with two upper guide post holes with respect to its central axis on the cope match-plate pattern 12, guide pin bushing 10 with its interference fit is housed in each upper guide post hole of cope match-plate pattern 12, two guide pin bushings 10 and two corresponding one by one settings of guide pillar 6, the inwall of the upper end of guide pillar 6 and guide pin bushing 10 be slidingly matched (playing the guiding role), be provided with two following guide pillar holes with two guide pillars, 6 opposite position places on the lower bolster 5, the following guide pillar hole interference fit of the lower end of guide pillar 6 and lower bolster 5, blanking die 7 is arranged on the upper surface of lower bolster 5 and the two removably connect (present embodiment adopts screw to removably connect), last punch-die 17 and fixed head 11 all are arranged on the below of cope match-plate pattern 12, fixed head 11 is provided with center shoulder connecting hole, the upper end of last punch-die 17 is arranged on interior and the two interference fit of center shoulder connecting hole of fixed head 11, gasket ring 14 is arranged between cope match-plate pattern 12 and the fixed head 11, fixed head 11, gasket ring 14 removably connect with cope match-plate pattern 12 threes (adopting screw to removably connect in the present embodiment), stripper 8 is provided with central through hole, blanking die 7 is provided with the center cavity, the central through hole that stripper 8 is passed in the lower end of last punch-die 17 is arranged in the center cavity of blanking die 7, blanking die 7 is provided with the shoulder through hole, spring 27 is arranged in the shoulder through hole of blanking die 7, cope match-plate pattern 12, gasket ring 14, fixed head 11 is connected (the discharging connector 22 in the present embodiment is screw) with stripper 8 by discharging connector 22, pin stop 26 is arranged in the shoulder through hole of blanking die 7, spacing screw rod 30 is installed on the lower bolster 5, and the upper end of spacing screw rod 30 is arranged in the shoulder through hole of blanking die 7, spring 27 is by pin stop 26 and spacing screw rod 30 axial limitings, gasket ring 14 is provided with central shaft hole, top board 20 is arranged in the central shaft hole of gasket ring 14, the lower end of knockout rod 18 is passed on the upper surface that die shank 16 is arranged on gasket ring 14, the upper surface of last punch-die 17 is provided with center shoulder installing hole, the lower surface of last punch-die 17 is provided with the type hole (profile of the shape in type hole and workpiece 40 is consistent) that communicates with this center shoulder installing hole, the type hole is from top to bottom successively by the first circular platform type hole 17-1, the second circular platform type hole 17-2, the 3rd circular platform type hole 17-3 and cylindrical hole 17-4 form, the aperture, lower end of the second circular platform type hole 17-2 is greater than the aperture, lower end of the first circular platform type hole 17-1, the aperture, lower end of the 3rd circular platform type hole 17-3 is greater than the aperture, lower end of the second circular platform type hole 17-2, the aperture, lower end of the 3rd circular platform type hole 17-3 equates with the aperture of cylindrical hole 17-4, with the corresponding sidewall of going up punch-die 17 of the 3rd circular platform type hole 17-3 be indent circular arc sidewall 17-5, the angle of cut between the bottom face of the lower end in type hole and last punch-die 17 is a fillet, piercing punch fixed head 25 and backing plate 23 are arranged on interior gasket ring 14 axial limitings that also pass through of center shoulder installing hole of punch-die 17 from the bottom to top, piercing punch fixed head 25 is connected by threaded connector 21 (threaded connector 21 in the present embodiment is screw) with backing plate 23, and the upper end of threaded connector 21 leans on the lower surface of top board 20, piercing punch fixed head 25 is provided with piercing punch mounting center hole, the upper end of piercing punch 24 is arranged in the piercing punch mounting center hole, following punch-die 4 is provided with piercing punch and connects centre bore, the piercing punch that the lower end of piercing punch 24 is arranged on down punch-die 4 connects in the centre bore, the upper end conformal of following punch-die 4 is arranged in the type hole of punch-die 17, cavity between following punch-die 4 and the last punch-die 17 is a die cavity, following punch-die 4 removably connect with lower bolster 5 (adopting screw to removably connect in the present embodiment), move back that part plate 31 is sleeved on the piercing punch 24 and down between punch-die 4 and the piercing punch fixed head 25 (after being used for end-of-job workpiece being withdrawed from), blank holder 29 is sleeved on down on the lateral wall of punch-die 4 and between last punch-die 17 and lower bolster 5, the upper end of screwed pipe 33 is threaded with lower bolster 5, one group of flanging valve rubber 1 and two supporting plates 35 are sleeved on the screwed pipe 33, and one group of flanging valve rubber 1 is arranged on up and down between two supporting plates 35, one group of flanging valve rubber 1 and two supporting plates 35 all with screwed pipe 33 removably connect (fixing) by nut, the lower surface of blank holder 29 leans on the upper surface of supporting pin 2, the lower end of supporting pin 2 is passed lower bolster 5 and is leaned on supporting plate 35, screwed pipe 33 and following punch-die 4, last punch-die 17 and knockout rod 18 coaxial settings.
The specific embodiment two: in conjunction with Fig. 1 explanation, the upper die component of present embodiment also comprises anti-rotation lock screw 19; Die shank 16 is connected with cope match-plate pattern 12 anti-rotation by anti-rotation lock screw 19.Other is identical with the specific embodiment one.
Embodiment: the height H of the shallow Tapered Cup of the outer diameter D of utilizing the shallow Tapered Cup port behind a kind of shallow Tapered Cup Drawing moulding composite die drawing and forming with indent sidewall of the present invention after for 73.9mm, drawing and forming is 16.5mm.
Operation principle is: the shape and size of the shallow Tapered Cup with indent sidewall of pull and stretch as required, design blanking die 7, go up punch-die 17, punch-die 4 and other auxiliary component down, and they be assembled into a complete composite die.This composite die is installed on the crank press, and lower bolster 5 is fixed on the following table of crank press, upper die component is fixed on the top shoe of crank press (along with the rotation of equipment bent axle, move up and down together with top shoe, whenever pump once, finish a working cycles, moving downward is impulse stroke, moving upward is idle running), according to the good die shut height of Height Adjustment (being as the criterion) of pull and stretch workpiece 40 with the complete joint product pattern of workpiece.Before the pull and stretch, be close on the upper surface of punch-die 4 and with pin stop 26 under earlier plate being placed, click clutch switch, allow slide block move downward, at first, the last punch-die 17 of upper die component is finished blanking work with the blanking die 7 of following membrane module; Upper die component continues descending, and the last punch-die 17 of upper die component and the following punch-die 4 of following membrane module are finished the pull and stretch work of workpiece (the shallow Tapered Cup with indent sidewall); Upper die component continues descending, and the piercing punch 24 of upper die component is finished punch work with the following punch-die 4 of following membrane module; Upper die component continues descending again, and the last punch-die 17 of upper die component is finished crowded edge work with the following punch-die 4 of following membrane module; Upper die component continues descending again, and the last punch-die 17 of upper die component is finished school shape work with the following punch-die 4 of following membrane module.Begin backhaul after slide block arrives minimum point, blank holder 29, supporting pin 2, supporting plate 35, flanging valve rubber 1 and screwed pipe 33 (constituting blank body by above-mentioned member) are along with upper die component moves on returning gradually, until resetting.Be contained in the type hole of punch-die 17 by the good workpiece 40 of punching out (shallow Tapered Cup) with indent sidewall, after upper die component turns back to certain position, knockout rod 18, top board 20, move back part plate 31 and threaded connector 21 (constituting out part mechanism by above-mentioned member) is started working, workpiece 40 (the shallow Tapered Cup with indent sidewall) is ejected in the type hole of last punch-die 17, have centre punching 40-1 on the bottom face of the workpiece 40 of institute's drawing and forming (shallow Tapered Cup) with indent sidewall.
Claims (2)
1. shallow Tapered Cup Drawing moulding composite die with indent sidewall, described composite die is made up of upper die component and following membrane module; It is characterized in that: upper die component comprises die shank (16), cope match-plate pattern (12), two guide pin bushings (10), gasket ring (14), fixed head (11), knockout rod (18), top board (20), discharging connector (22), backing plate (23), piercing punch (24), piercing punch fixed head (25), goes up punch-die (17), moves back part plate (31) and threaded connector (21); Following membrane module is made up of supporting pin (2), lower bolster (5), two guide pillars (6), blanking die (7), stripper (8), following punch-die (4), pin stop (26), blank holder (29), spring (27), supporting pin (2), spacing screw rod (30), screwed pipe (33), supporting plate (35) and one group of flanging valve rubber (1); The lower end of die shank (16) and cope match-plate pattern (12) removably connect, cope match-plate pattern (12) is gone up and is arranged with two upper guide post holes with respect to its central axis, guide pin bushing (10) with its interference fit is housed in each upper guide post hole of cope match-plate pattern (12), two guide pin bushings (10) and the corresponding one by one setting of two guide pillars (6), the inwall of the upper end of guide pillar (6) and guide pin bushing (10) is slidingly matched, lower bolster (5) is gone up with two guide pillars (6) opposite position place and is provided with two following guide pillar holes, the following guide pillar hole interference fit of the lower end of guide pillar (6) and lower bolster (5), blanking die (7) is arranged on the upper surface of lower bolster (5) and the two removably connects, last punch-die (17) and fixed head (11) all are arranged on the below of cope match-plate pattern (12), fixed head (11) is provided with center shoulder connecting hole, the upper end of last punch-die (17) is arranged on interior and the two interference fit of center shoulder connecting hole of fixed head (11), gasket ring (14) is arranged between cope match-plate pattern (12) and the fixed head (11), fixed head (11), gasket ring (14) removably connects with cope match-plate pattern (12) three, stripper (8) is provided with central through hole, blanking die (7) is provided with the center cavity, the central through hole that stripper (8) is passed in the lower end of last punch-die (17) is arranged in the center cavity of blanking die (7), blanking die (7) is provided with the shoulder through hole, spring (27) is arranged in the shoulder through hole of blanking die (7), cope match-plate pattern (12), gasket ring (14), fixed head (11) is connected by discharging connector (22) with stripper (8), pin stop (26) is arranged in the shoulder through hole of blanking die (7), spacing screw rod (30) is installed on the lower bolster (5), and the upper end of spacing screw rod (30) is arranged in the shoulder through hole of blanking die (7), spring (27) is by pin stop (26) and spacing screw rod (30) axial limiting, gasket ring (14) is provided with central shaft hole, top board (20) is arranged in the central shaft hole of gasket ring (14), the lower end of knockout rod (18) is passed die shank (16) and is arranged on the upper surface of gasket ring (14), the upper surface of last punch-die (17) is provided with center shoulder installing hole, the lower surface of last punch-die (17) is provided with the type hole that communicates with this center shoulder installing hole, the type hole is from top to bottom successively by the first circular platform type hole (17-1), the second circular platform type hole (17-2), the 3rd circular platform type hole (17-3) and cylindrical hole (17-4) are formed, the aperture, lower end in the second circular platform type hole (17-2) is greater than the aperture, lower end in the first circular platform type hole (17-1), the aperture, lower end in the 3rd circular platform type hole (17-3) is greater than the aperture, lower end in the second circular platform type hole (17-2), the aperture, lower end in the 3rd circular platform type hole (17-3) equates with the aperture of cylindrical hole (17-4), with the corresponding sidewall of going up punch-die (17) in the 3rd circular platform type hole (17-3) be indent circular arc sidewall (17-5), the angle of cut between the bottom face of the lower end in type hole and last punch-die (17) is a fillet, piercing punch fixed head (25) and backing plate (23) are arranged on interior gasket ring (14) axial limiting that also passes through of center shoulder installing hole of punch-die (17) from the bottom to top, piercing punch fixed head (25) is connected by threaded connector (21) with backing plate (23), and the upper end of threaded connector (21) leans on the lower surface of top board (20), piercing punch fixed head (25) is provided with piercing punch mounting center hole, the upper end of piercing punch (24) is arranged in the piercing punch mounting center hole, following punch-die (4) is provided with piercing punch and connects centre bore, the piercing punch that the lower end of piercing punch (24) is arranged on down punch-die (4) connects in the centre bore, the upper end conformal of following punch-die (4) is arranged in the type hole of punch-die (17), cavity between following punch-die (4) and the last punch-die (17) is a die cavity, following punch-die (4) removably connects with lower bolster (5), moving back part plate (31) is sleeved on piercing punch (24) and goes up and be positioned at down between the punch-die (4) and piercing punch fixed head (25), blank holder (29) is sleeved on down on the lateral wall of punch-die (4) and is positioned between punch-die (17) and the lower bolster (5), the upper end of screwed pipe (33) is threaded with lower bolster (5), one group of flanging valve rubber (1) and two supporting plates (35) are sleeved on the screwed pipe (33), and one group of flanging valve rubber (1) is arranged on up and down between two supporting plates (35), one group of flanging valve rubber (1) and two supporting plates (35) all removably connect with screwed pipe (33), the lower surface of blank holder (29) leans on the upper surface of supporting pin (2), the lower end of supporting pin (2) is passed lower bolster (5) and is leaned on supporting plate (35), screwed pipe (33) and following punch-die (4), last punch-die (17) and the coaxial setting of knockout rod (18).
2. a kind of shallow Tapered Cup Drawing moulding composite die according to claim 1 with indent sidewall, it is characterized in that: upper die component also comprises anti-rotation lock screw (19); Die shank (16) is connected with cope match-plate pattern (12) anti-rotation by anti-rotation lock screw (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010262951 CN102371309B (en) | 2010-08-26 | 2010-08-26 | Deep drawing forming composite die for shallow conical pieces with sunken side walls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010262951 CN102371309B (en) | 2010-08-26 | 2010-08-26 | Deep drawing forming composite die for shallow conical pieces with sunken side walls |
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| Publication Number | Publication Date |
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| CN102371309A CN102371309A (en) | 2012-03-14 |
| CN102371309B true CN102371309B (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010262951 Active CN102371309B (en) | 2010-08-26 | 2010-08-26 | Deep drawing forming composite die for shallow conical pieces with sunken side walls |
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| CN201432054Y (en) * | 2009-05-11 | 2010-03-31 | 襄樊东昇机械有限公司 | Die compounding blanking, stretching and lateral punching |
| CN101767153B (en) * | 2010-01-29 | 2011-08-24 | 华中科技大学 | Composite forming die |
| CN201807657U (en) * | 2010-08-26 | 2011-04-27 | 哈尔滨建成集团有限公司 | Composite die for drawing and forming shallow conical parts with recessed lateral walls |
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