Drawing die capable of delaying return stroke of pressure plate

Abstract

The utility model relates to the technical field of dies, in particular to a drawing die capable of delaying return stroke of a pressure plate. Comprising a lower die base, a drawing male die, a lower material pressing plate, an edge surrounding plate, a driving block, an upper die base, an upper material pressing plate, a drawing female die, an upper material pressing elastic piece, a material ejecting rod, a material ejecting elastic piece elastically connected between the material ejecting rod and the upper die base and a return stroke delay control mechanism arranged on the upper die base, and the top of the drawing male die extends out of the top face of the lower die base; a driving slope is arranged at the vertex angle of the inner side of the driving block and used for being in driving connection with the input end of a return stroke delay control mechanism, and the output end of the return stroke delay control mechanism is used for controlling return stroke delay of the upper pressing plate. According to the ejection rod, stable demolding of a formed workpiece is facilitated, the driving block and the return stroke delay control mechanism are matched to control return stroke delay of the upper pressing plate, and the quality problems that the formed workpiece deforms or generates surface cracks and the like due to instant return stroke extrusion of the upper pressing plate after being formed are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mould technical field especially is a kind of drawbead die of material pressing plate return delay. BACKGROUND

[0002] In the automobile manufacturing and other industrial product processing process, the die is the core process equipment for realizing the precision forming of parts, and the drawbead die is widely used in batch production of complex curved surface parts due to its excellent surface forming capability. The working principle of the drawbead die is based on the cooperative movement of the upper and lower dies, and the plastic deformation of the workpiece is caused by the interaction force between the die surface and the workpiece, so that the parts with specific geometric shape and dimensional accuracy are obtained. However, in the production practice, there is a key technical bottleneck in the opening process of the traditional drawbead die: when the upper pressure plate is lifted with the upper die seat, the instantaneous fast return of the upper die pressure plate will apply instantaneous extrusion force to the formed workpiece, which will cause shape distortion, surface cracks and other quality problems of the formed workpiece, and even cause irreparable waste. This technical defect not only seriously affects the dimensional accuracy and surface quality of the product, resulting in a decrease in the qualified rate, but also significantly increases the material loss and production cost, which has a double negative impact on the production efficiency and economic benefit of the enterprise.

[0003] In the prior art, the Chinese patent document with application number 202222544262.7 discloses a drawbead stamping die for controlling the delay reset of pressure plate, which aims to solve the technical problem that the inner pressure plate and the outer pressure edge ring simultaneously apply a pop-up force to the product during opening, which easily causes the deformation of the drawn product and reduces the quality of the product. The drawbead stamping die for controlling the delay reset of pressure plate comprises an upper die seat and a lower die seat, the upper die seat is provided with a stripper plate and a drawbead die, the lower die seat is provided with a drawbead punch and a pressure edge ring matched with the drawbead die, the upper die seat is provided with a first nitrogen gas spring, the lower die seat is provided with a rotating shaft at both ends, the rotating shaft is provided with a delay reset block, the lower end of the delay reset block is provided with a first top block and a second top block at both sides, the lower part of the first top block is provided with a second nitrogen gas spring, and the lower part of the second top block is provided with a spiral spring. UTILITY MODEL CONTENTS

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a drawbead die with pressure plate return delay.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The application discloses a draw die with a return delay of a blank holder, which comprises a lower die seat, a draw punch embedded in the middle part of the lower die seat, a lower blank holder arranged in the middle part of the lower die seat and surrounding the draw punch, a surrounding plate arranged on the top edge of the lower die seat and extending upwards, a driving block arranged on the top of the surrounding plate, a upper die seat arranged above the lower die seat and capable of lifting, a upper blank holder capable of lifting and slidingly connected to the upper die seat and arranged opposite to the lower blank holder, a draw female die embedded in the upper blank holder and matched with the draw punch, a upper blank holder elastic element elastically connected between the upper blank holder and the upper die seat, a ejector rod penetrating through the middle part of the upper blank holder and the middle part of the draw female die, a ejector elastic element elastically connected between the ejector rod and the upper die seat, and a return delay control mechanism arranged on the upper die seat, wherein the top of the draw punch extends out of the top surface of the lower die seat, the inner side top corner of the driving block is provided with a driving slope, the driving slope is used for driving connection with the input end of the return delay control mechanism, and the output end of the return delay control mechanism is used for controlling the return delay of the upper blank holder.

[0007] Further, the return delay control mechanism comprises two return delay control assemblies symmetrically arranged on the upper die seat, and the number of the driving blocks is two.

[0008] Further, the middle part of the bottom surface of the upper die seat is concavely arranged with a lifting cavity, the upper blank holder is slidingly connected with the inner wall of the lifting cavity, the two ends of the upper blank holder elastic element are respectively connected with the top wall of the lifting cavity and the top surface of the upper blank holder, and the two ends of the ejector elastic element are respectively connected with the top wall of the lifting cavity and the top surface of the ejector rod.

[0009] Further, the bottom side wall of the upper die seat is concavely arranged with a return delay groove, the return delay control assembly is located at the return delay groove, the return delay control assembly comprises a locking pin horizontally slidingly connected to the upper die seat, a T-shaped pull rod connected to the locking pin, a resisting block horizontally slidingly connected to the side wall of the return delay groove, and a return delay spring sleeved outside the shaft rod of the T-shaped pull rod, the resisting block is horizontally movably arranged in the return delay groove, the two ends of the return delay spring are elastically in contact with the pin head of the locking pin and the resisting block, the resisting block is continuously arranged with a return delay hole and a through hole from outside to inside, the hole diameter of the return delay hole is larger than that of the through hole, the shaft rod of the T-shaped pull rod slidingly penetrates through the through hole, the end cap of the T-shaped pull rod is slidingly arranged in the return delay hole, the pin rod of the locking pin can extend into the lifting cavity, the circumferential side of the upper blank holder is concavely arranged with a lock hole, the pin rod of the locking pin can be inserted into the lock hole, the outer end bottom side of the resisting block is provided with a resisting slope, and the resisting slope is used for slidingly matching with the driving slope; when the upper die seat and the lower die seat are in the mold opening state, the locking pin moves out of the lock hole and is located above the lock hole, and the return delay hole of the resisting block tightens the end cap of the T-shaped pull rod; when the upper die seat and the lower die seat are in the mold closing state, the pin rod of the locking pin is inserted into the lock hole, and the return delay hole of the resisting block loosens the end cap of the T-shaped pull rod.

[0010] Further, the upper die holder is provided with a sliding hole, the lifting cavity is communicated with the return delay groove through the sliding hole, and the locking pin is slidably penetrated through the sliding hole.

[0011] Further, the side wall of the return delay groove is concavely provided with a horizontal stroke groove, and the side wall of the abutting block is convexly provided with a sliding block which is slidably arranged in the horizontal stroke groove.

[0012] Further, the side wall of the return delay groove is concavely provided with a horizontal stroke groove, and the side wall of the abutting block is convexly provided with a sliding block which is slidably arranged in the horizontal stroke groove.

[0013] Further, the lower pressing plate is elastically connected with the lower die holder through a lower pressing plate elastic element, and the lower pressing plate can be lifted and moved relative to the lower die holder.

[0014] The beneficial effects of this utility model are as follows: In practical applications, when the lower die holder and the upper die holder are in the open state, the drive block separates from the return delay control mechanism. The drive inclined surface does not trigger the input end of the return delay control mechanism. The return delay control mechanism releases the upper pressure plate, and both the upper pressure elastic element and the ejector elastic element are in the extended state. The lower pressure plate is at its lowest position at this time, and the ejector rod is at its lowest position. The bottom end of the ejector rod extends into the cavity of the drawing die, placing the workpiece on the drawing punch and pressing down. The die plate supports the workpiece. As the upper and lower die bases gradually close, the drawing die gradually closes with the drawing punch. The upper pressure plate gradually approaches the lower pressure plate. The drive ramp of the drive block abuts against the input end of the return delay control mechanism. The upper pressure plate and the ejector rod are subjected to compressive force and move upward relative to the upper die base. The upper pressure elastic element and the ejector elastic element are compressed. When the upper and lower die bases are fully closed, the upper and lower pressure plates press the edges of the workpiece together. The drawing die and the drawing punch are in perfect alignment. When the workpiece is drawn, the ejector pin is squeezed and moved out of the cavity of the drawing die. At this time, the inner vertical surface of the drive block abuts against the input end of the return delay control mechanism, and the output end of the return delay control mechanism locks the upper pressure plate. After the workpiece is drawn, the upper and lower die holders gradually open. Under the action of the drive component, the return delay control mechanism gradually releases the upper pressure die, so that the return delay control mechanism does not immediately release the upper pressure die, thus causing the upper pressure die to return with a delay. (Reset) After the upper and lower pressure plates separate and release the workpiece, the ejector rod will be driven to return to its original position under the rebound force of the ejector elastic element. During the return reset process, the ejector rod will push downward against the drawn workpiece, facilitating stable demolding of the drawn workpiece from the drawing die. After the drawn workpiece is demolded from the drawing die, the return delay control mechanism will release the upper pressure plate, which will be driven to return to its original position under the rebound force of the upper pressure elastic element. The ejector rod of this utility model is beneficial to the stable demolding of the formed workpiece. By cooperating with the drive block and the return delay control mechanism to control the return delay of the upper pressure plate, the instantaneous return pressure of the upper pressure plate after the workpiece is formed can be avoided, which may cause deformation or surface cracks in the formed workpiece. Attached Figure Description

[0015] Fig. 1 This is a cross-sectional view of the present invention in the mold-open state.

[0016] Fig. 2 This is a cross-sectional view of the present invention in a semi-closed state.

[0017] Fig. 3 This is a cross-sectional view of the present invention in the mold-closed state.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1, lower die seat; 2, drawing male die; 3, lower pressing plate; 4, edge plate; 5, driving block; 6, upper die seat; 7, upper pressing plate; 8, drawing female die; 9, upper pressing elastic element; 10, ejector rod; 11, ejector elastic element; 12, return delay control mechanism; 13, driving slope; 14, return delay control assembly; 15, lifting cavity; 16, return delay slot; 17, locking pin; 18, T-shaped pull rod; 19, abutting block; 20, return delay spring; 21, return delay hole; 22, via hole; 23, locking hole; 24, abutting slope; 25, sliding hole; 26, embedded block; 27, lower pressing elastic element. DETAILED DESCRIPTION

[0020] For the convenience of those skilled in the art to understand, the utility model is further explained below in combination with examples and drawings, and the content mentioned in the embodiment is not a limitation to the utility model.

[0021] As Figs. 1 to 3 shown, the utility model provides a kind of drawing die of pressing plate return delay, it includes lower die seat 1, drawing male die 2 embedded in the middle part of lower die seat 1, lower pressing plate 3 being set in the middle part of lower die seat 1 and surrounding drawing male die 2, edge plate 4 being set to the top surface edge of lower die seat 1 and extending upwards, driving block 5 being set to the top of edge plate 4, upper die seat 6 being lifted and set to the upper of lower die seat 1, upper pressing plate 7 being lifted and slidably connected to upper die seat 6 and being oppositely set with lower pressing plate 3, drawing female die 8 being embedded in upper pressing plate 7 and being concave-convex adaptation with drawing male die 2, upper pressing elastic element 9 being elastically connected between upper pressing plate 7 and upper die seat 6, ejector rod 10 being lifted and slidably penetrating the middle part of upper pressing plate 7 and the middle part of drawing female die 8, ejector elastic element 11 being elastically connected between ejector rod 10 and upper die seat 6 and return delay control mechanism 12 being set to the upper die seat 6, the top of drawing male die 2 extends out of the top surface of lower die seat 1, the inner side top corner of driving block 5 is provided with driving slope 13, driving slope 13 is used to be drivenly connected with the input end of return delay control mechanism 12, and the output end of return delay control mechanism 12 is used to control the return delay of upper pressing plate 7.

[0022] In practical application, when the lower die seat 1 and the upper die seat 6 are in the mold opening state, the driving block 5 is separated from the return delay control mechanism 12, the driving slope 13 does not trigger the input end of the return delay control mechanism 12, the return delay control mechanism 12 releases the upper pressing plate 7, the upper pressing elastic element 9 and the ejection elastic element 11 are in the stretched state, the lower pressing plate 3 is in the lowest position at this time, the ejection rod 10 is in the lowest position at this time, the bottom end of the ejection rod 10 extends into the cavity of the drawing concave die 8, the workpiece is placed on the drawing convex die 2, the lower pressing plate 3 supports the workpiece, with the gradual closing of the upper die seat 6 and the lower die seat 1, the drawing concave die 8 gradually closes with the drawing convex die 2, the upper pressing plate 7 gradually approaches the lower pressing plate 3, the driving slope 13 of the driving block 5 will resist the input end of the return delay control mechanism 12, the upper pressing plate 7 and the ejection rod 10 will be extruded and move upward relative to the upper die seat 6, the upper pressing elastic element 9 and the ejection elastic element 11 are compressed, when the upper die seat 6 and the lower die seat 1 are completely closed, the upper pressing plate 7 and the lower pressing plate 3 press the edge of the workpiece tightly, the drawing concave die 8 and the drawing convex die 2 are concave-convex matched to draw and form the workpiece, the ejection rod 10 is extruded and moves out of the cavity of the drawing concave die 8, at this time, the inner vertical surface of the driving block 5 and the input end of the return delay control mechanism 12 resist, the output end of the return delay control mechanism 12 locks the upper pressing plate 7, after the workpiece is drawn and formed, the upper die seat 6 and the lower die seat 1 are gradually opened, under the action of the driving piece, the return delay control mechanism 12 gradually releases the upper pressing die, so that the return delay control mechanism 12 does not immediately release the upper pressing die, so that the upper pressing die has a return delay (delay reset), after the upper pressing plate 7 and the lower pressing plate 3 separate and release the workpiece, the ejection rod 10 will drive the ejection rod 10 to return to reset under the action of the rebound force of the ejection elastic element 11, in the process of the ejection rod 10 returning to reset, the ejection rod 10 will downwardly abut against the workpiece after drawing and forming, so as to facilitate the stable demolding of the workpiece after drawing and forming and the drawing concave die 8, after the workpiece after forming and the drawing concave die 8 are demolded, the return delay control mechanism 12 releases the upper pressing plate 7, the upper pressing plate 7 drives the upper pressing plate 7 to return to reset under the action of the rebound force of the upper pressing elastic element 9. The ejection rod 10 of the utility model is beneficial to the stable demolding of the workpiece after forming, the upper pressing plate 7 is controlled to return to delay through the cooperation of the driving block 5 and the return delay control mechanism 12, so as to avoid that the workpiece after forming is extruded by the instantaneous return of the upper pressing plate 7, so that the workpiece after forming is deformed or has surface cracks and other quality problems.

[0023] Specifically, the ejection elastic element 11 and the upper pressing elastic element 9 can both adopt nitrogen gas springs.

[0024] In the embodiment, the return delay control mechanism 12 comprises two return delay control assemblies 14 symmetrically arranged on the upper die holder 6, the number of the driving blocks 5 is two, and the two return delay control assemblies 14 are arranged in one-to-one correspondence with the two driving blocks 5 respectively. The two return delay control assemblies 14 control the return delay of the upper pressing plate 7 at the same time, so that the upper pressing plate 7 is stressed uniformly, and the stability of the return delay of the upper pressing plate 7 is improved.

[0025] In the embodiment, the middle part of the bottom surface of the upper die holder 6 is recessed with a lifting cavity 15, the upper pressing plate 7 is slidingly connected with the inner wall of the lifting cavity 15, the two ends of the upper pressing elastic element 9 are connected with the top wall of the lifting cavity 15 and the top surface of the upper pressing plate 7 respectively, and the two ends of the top pressing elastic element 11 are connected with the top wall of the lifting cavity 15 and the top surface of the top pressing rod 10 respectively. With the structure design, the upper pressing plate 7 can move up and down in the lifting cavity 15, so that the structure of the upper pressing plate 7 and the upper die holder 6 is compact.

[0026] In the embodiment, the bottom side wall of the upper die holder 6 is recessed with a return delay slot 16, the return delay control assembly 14 is located at the return delay slot 16, the return delay control assembly 14 comprises a locking pin 17 horizontally slidingly connected with the upper die holder 6, a T-shaped pull rod 18 connected with the locking pin 17, a resisting block 19 horizontally slidingly connected with the side wall of the return delay slot 16, and a return delay spring 20 sleeved on the shaft rod outside the T-shaped pull rod 18, the resisting block 19 is horizontally movably arranged in the return delay slot 16, the two ends of the return delay spring 20 are elastically in contact with the pin head of the locking pin 17 and the resisting block 19 respectively, the resisting block 19 is continuously provided with a return delay hole 21 and a through hole 22 from outside to inside, the hole diameter of the return delay hole 21 is larger than that of the through hole 22, the shaft rod of the T-shaped pull rod 18 slidingly penetrates through the through hole 22, the end cap of the T-shaped pull rod 18 is slidingly arranged in the return delay hole 21, the pin rod of the locking pin 17 can extend into the lifting cavity 15, the circumferential side of the upper pressing plate 7 is recessed with a lock hole 23, the pin rod of the locking pin 17 can be inserted into the lock hole 23, the outer end bottom side of the resisting block 19 is provided with a resisting inclined surface 24, and the resisting inclined surface 24 is used for slidingly matching with the driving inclined surface 13; when the upper die holder 6 and the lower die holder 1 are in the mold opening state, the locking pin 17 moves out of the lock hole 23 and is located above the lock hole 23, the return delay hole 21 of the resisting block 19 tightens the end cap of the T-shaped pull rod 18, and the return delay spring 20 is in the stretched state or the slight compression state; when the upper die holder 6 and the lower die holder 1 are in the mold closing state, the pin rod of the locking pin 17 is inserted into the lock hole 23, the return delay spring 20 is in the compression state, and the return delay hole 21 of the resisting block 19 loosens the end cap of the T-shaped pull rod 18.

[0027] In practical application, when the upper die holder 6 and the lower die holder 1 are in the mold opening state, the upper material pressing elastic member 9 and the material ejecting elastic member 11 are in the stretched state, the upper material pressing plate 7 and the material ejecting rod 10 are all in the lowest position, the bottom end of the material ejecting rod 10 extends into the cavity of the drawing concave die 8, the locking pin 17 moves out of the locking hole 23 and is located above the locking hole 23, the return delay spring 20 is in the stretched state or a small amount of compression state, and the return delay hole 21 of the abutting block 19 tightens the end cap of the T-shaped pull rod 18; with the gradual closing of the upper die holder 6 and the lower die holder 1, the driving slope 13 of the driving block 5 and the abutting slope 24 of the abutting block 19 slide and abut, under the abutting cooperation of the driving slope 13 and the abutting slope 24, the driving block 5 will extrude the abutting block 19 inward, so that the abutting block 19 moves inward relative to the T-shaped pull rod 18 and compresses the return delay spring 20, in this process, the locking pin 17 is still above the locking hole 23, and the end face of the abutting block 19 abuts with the inner vertical face of the driving block 5, when the upper die holder 6 and the lower die holder 1 are completely closed, the locking pin 17 is aligned with the locking hole 23, and the locking pin 17 is inserted into the locking hole 23 under the rebounding force of the return delay spring 20, so as to lock the lower material pressing plate 3, at this time, the drawing concave die 8 cooperates with the drawing convex die 2 to perform drawing forming on the workpiece; when it is necessary to open the mold and take away the formed workpiece, the upper die holder 6 and the lower die holder 1 are opened, with the gradual opening of the upper die holder 6 and the lower die holder 1, the upper material pressing plate 7 will gradually separate from the lower material pressing plate 3, the abutting block 19 will rise to the abutting slope 24 thereof slidingly abutting with the driving slope 13 of the driving block 5, in the process of abutting cooperation of the abutting slope 24 and the driving slope 13, the abutting block 19 will move outward and horizontally under the rebounding force of the return delay spring 20, so that the abutting block 19 can move outward and horizontally relative to the T-shaped pull rod 18, until the return delay hole 21 of the abutting block 19 tightens the end cap of the T-shaped pull rod 18, when the upper material pressing plate 7 separates from the formed workpiece, the driving block 5 separates from the abutting block 19, the abutting block 19 will pull the T-shaped pull rod 18 to move outward and horizontally synchronously under the rebounding force of the return delay spring 20, the horizontally moving T-shaped pull rod 18 will drive the locking pin 17 to move outward and horizontally, until the locking pin 17 is pulled out of the locking hole 23, thereby releasing the upper material pressing plate 7, so that the upper material pressing plate 7 is returned and reset under the rebounding force of the upper material pressing elastic member 9, to realize the delayed return of the upper material pressing plate 7.

[0028] In the embodiment, the upper die holder 6 is provided with a sliding hole 25, the lifting cavity 15 communicates with the return delay groove 16 through the sliding hole 25, and the locking pin 17 slidingly penetrates the sliding hole 25. The structure design improves the stability of the reciprocating horizontal movement of the locking pin 17.

[0029] In the embodiment, the side wall of the return stroke groove 16 is concave, the side wall of the abutting block 19 is convex, and the slider is slidingly arranged in the horizontal stroke groove. In actual application, the slider can reciprocatingly slide along the horizontal stroke groove, thereby improving the stability of the horizontal movement of the abutting block 19. The horizontal stroke groove restricts the slider to slide within a preset stroke, thereby avoiding the separation of the abutting block 19 from the upper die seat 6.

[0030] In the embodiment, the side wall of the return stroke groove 16 is concave, the side wall of the abutting block 19 is convex, and the slider is slidingly arranged in the horizontal stroke groove. In actual application, the slider can reciprocatingly slide along the horizontal stroke groove, thereby improving the stability of the horizontal movement of the abutting block 19. The horizontal stroke groove restricts the slider to slide within a preset stroke, thereby avoiding the separation of the abutting block 19 from the upper die seat 6.

[0031] In the embodiment, the lower pressing plate 3 is elastically connected with the lower die seat 1 through the lower pressing elastic element 27, and the lower pressing plate 3 can be lifted and moved relative to the lower die seat 1. Specifically, the lower pressing elastic element 27 can be a nitrogen spring. When the lower pressing plate 3 is subjected to a downward pressing force when the upper die seat 6 and the lower die seat 1 are closed, the lower pressing plate 3 will be lowered and compressed, thereby playing a buffering role and being beneficial to the pressing of the workpiece by the upper pressing plate 7 and the lower pressing plate 3.

[0032] All the technical features in the embodiment can be freely combined according to actual needs.

[0033] The above embodiment is a preferred implementation scheme of the utility model, and the utility model can also be implemented in other ways without departing from the technical scheme concept. Any obvious replacement within the scope of the utility model is within the protection scope of the utility model.

Claims

1. A draw die with a blank holder return delay, characterized by: The application relates to a drawing die set, which comprises a lower die seat (1), a drawing punch (2) embedded in the middle part of the lower die seat (1), a lower blank holder (3) arranged in the middle part of the lower die seat (1) and surrounding the drawing punch (2), a surrounding edge plate (4) arranged on the top edge of the lower die seat (1) and extending upwards, a driving block (5) arranged on the top of the surrounding edge plate (4), a upper die seat (6) arranged above the lower die seat (1) and lifting, a upper blank holder (7) slidingly connected to the upper die seat (6) and arranged opposite to the lower blank holder (3), a drawing female die (8) embedded in the upper blank holder (7) and matched with the drawing punch (2), a upper blank holder elastic element (9) elastically connected between the upper blank holder (7) and the upper die seat (6), a ejector rod (10) penetrating the middle part of the upper blank holder (7) and the middle part of the drawing female die (8) and lifting, a ejector elastic element (11) elastically connected between the ejector rod (10) and the upper die seat (6), and a return delay control mechanism (12) arranged on the upper die seat (6), wherein the top of the drawing punch (2) extends out of the top surface of the lower die seat (1), the inner side top corner of the driving block (5) is provided with a driving slope (13), the driving slope (13) is used for driving connection with the input end of the return delay control mechanism (12), and the output end of the return delay control mechanism (12) is used for controlling the return delay of the upper blank holder (7).

2. A draw-mould with a blank-holder return delay according to claim 1, characterised in that: The return delay control mechanism (12) comprises two return delay control assemblies (14) symmetrically arranged on the upper die seat (6), and the number of the driving blocks (5) is two; the two return delay control assemblies (14) are arranged in one-to-one correspondence with the two driving blocks (5) respectively.

3. A draw-mould with a blank-holder return delay according to claim 2, characterised in that: The bottom surface of the upper die seat (6) is concavely provided with a lifting cavity (15), the upper blank holder (7) is slidingly connected with the inner wall of the lifting cavity (15), the two ends of the upper blank holder elastic element (9) are connected with the top wall of the lifting cavity (15) and the top surface of the upper blank holder (7) respectively, and the two ends of the ejector elastic element (11) are connected with the top wall of the lifting cavity (15) and the top surface of the ejector rod (10) respectively.

4. A draw-mould with a blank-holder return delay according to claim 3, characterised in that: The bottom side wall of the upper die seat (6) is concave with a return delay slot (16), a return delay control assembly (14) is located at the return delay slot (16), the return delay control assembly (14) comprises a locking pin (17) horizontally and slidingly connected to the upper die seat (6), a T-shaped pull rod (18) connected to the locking pin (17), a resisting block (19) horizontally and slidingly connected to the side wall of the return delay slot (16), and a return delay spring (20) sleeved outside the shaft rod of the T-shaped pull rod (18), the resisting block (19) is horizontally and movably arranged in the return delay slot (16), the two ends of the return delay spring (20) are elastically in contact with the pin head of the locking pin (17) and the resisting block (19) respectively, the resisting block (19) is continuously provided with a return delay hole (21) and a through hole (22) from outside to inside, the hole diameter of the return delay hole (21) is larger than that of the through hole (22), the shaft rod of the T-shaped pull rod (18) slidingly penetrates through the through hole (22), the end cap of the T-shaped pull rod (18) is slidingly arranged in the return delay hole (21), the pin rod of the locking pin (17) can extend into the lifting cavity (15), the peripheral side of the upper pressing plate (7) is concave with a lock hole (23), the pin rod of the locking pin (17) can be inserted into the lock hole (23), the outer end bottom side of the resisting block (19) is provided with a resisting slope (24), and the resisting slope (24) is used for slidingly cooperating with the driving slope (13).

5. A draw-mould with a blank-holder return delay according to claim 4, characterised in that: The upper die seat (6) is provided with a sliding hole (25), the lifting cavity (15) communicates with the return delay slot (16) through the sliding hole (25), and the locking pin (17) slidingly penetrates through the sliding hole (25).

6. A draw-mould with a blank-holder return delay according to claim 4, characterised in that: The side wall of the return delay slot (16) is concave with a horizontal stroke slot, and the side wall of the resisting block (19) is convex with a sliding block which is slidingly arranged in the horizontal stroke slot.

7. The draw-mould with return delay of the blank holder according to claim 4, characterised in that: The peripheral side of the upper pressing plate (7) is embedded with an embedded block (26), and the lock hole (23) is arranged in the embedded block (26).

8. The draw-mould with a blank-holder return delay according to claim 1, characterised in that: The lower pressing plate (3) is elastically connected with the lower die seat (1) through a lower pressing elastic element (27), and the lower pressing plate (3) can move up and down relative to the lower die seat (1).

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