Multi-layer combined stretching punch, upper stretching male die and stretching device

Abstract

The utility model belongs to the technical field of metal barrel-shaped stretching, and particularly relates to a multi-layer combined stretching punch, an upper stretching male die and a stretching device. The defects of unreasonable design and the like in the prior art are overcome. The multi-layer combined type stretching punch comprises a stretching punch rod and at least one first forming sleeve, wherein the lower end of the stretching punch rod is sleeved with the first forming sleeve, and the stretching punch rod is in sliding fit with the first forming sleeve. The multi-layer combined type stretching punch has the advantages that continuous coaxial stretching machining of different stretching depths in the axial direction of the same vertical axis can be achieved, the stretching machining quality of a stretching piece can be ensured, and the stretching coaxiality of the stretching piece in different stretching machining steps can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal cylindrical stretching, and particularly relates to a multi-layer combined stretching punch, an upper stretching convex die and a stretching device. Background Art

[0002] During the stretching process of metal shells (such as cylindrical battery shells) or cylinders, the existing stretching devices use multiple sets of independent and continuous stretching dies for stretching. The disadvantage of this method is that the stretched parts need to be stamped and stretched by different independent stretching die punches. The stretching performed before and after cannot ensure that the axis line of the stretching punch coincides with the axis line of the stretched part, which seriously affects the stretching accuracy.

[0003] For example, 202211226031.X, the round steel shell forming process of the battery and the battery assembly process, which uses a continuous punching die to punch out a round cup-shaped blank, and then uses a stamping die to stretch the round cup-shaped blank into a long cylindrical blank, and punches explosion-proof notches and annular convex bulges on the surface of the closing piece of the long cylindrical blank to form a round steel shell with explosion-proof notches and annular convex bulges, and then loads the battery cell assembly into the round steel shell, and then welds the battery top cover to the open end of the round steel shell to form a round steel shell battery, and the closing piece with an explosion-proof valve and the annular shell are combined to form an integrated round steel shell to improve the blasting performance of the explosion-proof valve, and an elliptical groove is formed on the battery top cover, and multiple batteries are connected by electrical connecting pieces to limit positioning to improve the battery life. This solution does not solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-layer combined stretching punch, an upper stretching punch and a stretching device that can solve the above technical problems.

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

[0006] The multi-layer combined stretching punch comprises a stretching punch and at least one first forming sleeve, wherein the first forming sleeve is sleeved on the lower end of the stretching punch and the stretching punch and the first forming sleeve are slidably matched, and during the first-stage stretching, the lower end of the stretching punch is flush with the lower end of the first forming sleeve, and during the second-stage stretching, the lower end of the stretching punch extends out from the lower end of the first forming sleeve.

[0007] In the above-mentioned multi-layer combined stretching punch, a punch core is provided at the lower end of the stretching punch, and the first forming sleeve is sleeved on the punch core.

[0008] In the above-mentioned multi-layer combined stretching punch, the diameter of the stretching punch is equal to the diameter of the punch core.

[0009] In the above-mentioned multi-layer combined stretching punch, a reduced diameter section is provided at the lower end of the stretching punch rod, and a reduced diameter section matching blind hole with an open upper end is axially provided in the punch rod core, and the reduced diameter section is fixed in the reduced diameter section matching blind hole.

[0010] In the above-mentioned multi-layer combined stretching punch, a flange is provided on the first forming sleeve.

[0011] In the above-mentioned multi-layer combined stretching punch, the stretching punch rod is any one of a solid rod and a hollow rod with a closed lower end.

[0012] In the above-mentioned multi-layer combined stretching punch, the length of the punch core is longer than the length of the first forming sleeve.

[0013] In the above-mentioned multi-layer combined stretching punch, the stretching punch rod is any one of a cylindrical punch rod and a square punch rod, and the first forming sleeve is any one of a cylindrical forming sleeve and a square forming sleeve.

[0014] The present application also provides an upper stretching punch, which includes the multi-layer combined stretching punch.

[0015] The present application also provides a stretching device, which includes the upper stretching punch.

[0016] Compared with the existing technology, the advantages of this application are:

[0017] The multi-layer combined stretching punch can realize continuous coaxial stretching processing with different stretching depths in the axial direction of the same vertical axis, which can ensure the stretching processing quality of the stretched part and the stretching coaxiality of the stretched part in different stretching processing steps.

[0018] Secondly, the multi-layer combined stretching punch of the present application can adapt to different process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the stretching device provided by the utility model.

[0020] Figure 2 It is a structural schematic diagram of the stretching device provided by the utility model.

[0021] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along line AA.

[0022] Figure 4 The utility model is a schematic diagram of the structure of the material guiding mechanism for the stretched finished product.

[0023] Figure 5 The utility model is a schematic diagram of the top view of the demoulding structure of the drawing part.

[0024] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure along the middle CC line.

[0025] Figure 7 It is a schematic diagram of the partial explosion structure of the demoulding structure of the stretched part provided by the utility model.

[0026] Figure 8 It is a three-dimensional structural schematic diagram of the quick disassembly and assembly mechanism provided by the utility model.

[0027] Fig. 9 The utility model is a schematic diagram of the structure of the quick disassembly and assembly mechanism provided by the utility model.

[0028] Fig.10 yes Fig. 9 Schematic diagram of the cross-section structure along line BB.

[0029] Fig.11 The utility model is a schematic diagram of the explosion structure of a multi-layer combined stretch punch.

[0030] Fig.12 The utility model is a schematic diagram of a multi-layer combined drawing punch cooling structure.

[0031] Fig.13 It is a schematic diagram of the partial explosion structure of the material pulling mechanism provided by the utility model.

[0032] Fig.14 It is a schematic diagram of the state after the material pulling mechanism provided by the utility model pulls the highest fixed plate body.

[0033] Fig.15 It is a partial structural schematic diagram of the multi-layer drive plate linkage loosening mechanism provided by the utility model.

[0034] Fig.16 It is a schematic diagram of the top view structure of the stretching device provided by the utility model.

[0035] Fig.17 It is a schematic diagram of the changes of the metal stamping cup provided by the utility model after being stretched multiple times by the stretching device of the present application to finally obtain a stretched part.

[0036] Fig.18 It is a schematic diagram of the primary stretching locking state of the multi-layer drive plate linkage loosening mechanism provided by the utility model.

[0037] Fig.19 yes Fig.18 Schematic diagram of the explosion structure.

[0038] Fig. 20 It is a schematic diagram of the pull rod structure of the pulling mechanism. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0040] Embodiment 1

[0041] like Fig.17 As shown, the stretching device is used for stretching a metal stamping cup part a, for example, a battery shell cylinder, etc. The metal stamping cup part a is stretched to form a stretched finished part or a stretched part.

[0042] The function of the stretching device is to perform multiple axial stretching on a metal stamping cup a, so that the diameter of the stamping cup is continuously reduced, and the axial length of the stamping cup is continuously increased.

[0043] Specifically, Figure 1-Figure 3 As shown, the stretching device of this embodiment is a vertical stretching device, which includes a lower stretching die 1 and an upper stretching punch 2 which are distributed in sequence from bottom to top. The metal stamping cup piece a is pre-placed in the lower stretching die 1, and the upper stretching punch 2 moves relative to the lower stretching die 1 to allow the metal stamping cup piece a to be stretched.

[0044] The lower drawing die 1 comprises a bottom plate 10, on which an overhead support seat 11 is arranged, and on the top of the overhead support seat 11, there are multi-layer drawing die rings 12 spaced from bottom to top, and the multi-layer drawing die rings 12 are coaxial and the inner diameters gradually decrease from top to bottom.

[0045] like Figure 3 As shown, a stretching avoidance through hole 110 is provided on the overhead support seat 11, which is connected to the inner space of the stretching die ring 12. During each stretching process, the inner diameter of each stretching die ring 12 is different, and the two stretching die rings 12 spaced apart from each other can form a stretching stroke. When the stamping cup performs the last several or one stretching process, the lower end of the stretched stamping cup enters the stretching avoidance through hole 110, that is, one stretching die ring 12 can form a stretching process for the stamping cup. Of course, the stamping cup moves downward from the top stretching die ring 12 for multiple stretching processes.

[0046] like Figure 4 As shown, a material guiding mechanism 3 for finished stretched parts is provided on the bottom plate 10 or the overhead support seat 11. The material guiding mechanism 3 for finished stretched parts is used to tilt and guide the finished stretched parts that fall downward after being demoulded from the upper stretching punch 2, so as to prevent the finished stretched parts from overlapping each other and being retained on the lower stretching die 1 after falling downward.

[0047] Specifically, the material guiding mechanism 3 for the finished stretched part of the present embodiment includes an inclined elastic inclined plate 30 which is fixed to the overhead support seat 11 on the upper side and is located in the overhead support seat 11. The upper end of the inclined elastic inclined plate 30 is located outside the lower hole opening of the stretching avoidance through hole 110, and the lower side of the inclined elastic inclined plate 30 is free. A bottom support platform 100 is provided on the upper surface of the bottom plate 10 and is located directly below the stretching avoidance through hole 110. A stretching movement stroke is formed between the lower hole opening of the stretching avoidance through hole 110 and the bottom support platform 100. Under normal circumstances, the lower side of the inclined elastic inclined plate 30 is in the stretching movement stroke. When the last stretching is performed, the finished stretched part at this time further stretches downward and contacts the inclined elastic inclined plate 30, causing the inclined elastic inclined plate 30 to deform. When the lower end of the finished stretched part contacts the bottom support platform 100, it indicates that the stretching processing of the finished stretched part is completed, and then it enters the demolding stage.

[0048] A vertical plate 31 which is normally vertically arranged is connected to the lower side of the inclined elastic inclined plate 30 , and the inclined elastic inclined plate 30 and the vertical plate 31 form an obtuse angle greater than 90°.

[0049] The upper side of the inclined elastic inclined plate 30 is connected to a transverse plate 32, and the transverse plate 32 and the inclined elastic inclined plate 30 form an obtuse angle. Of course, the transverse plate 32 can be directly fixed to the overhead support seat 11. The specific fixing method is: a plurality of fasteners are provided on the transverse plate 32, and the fasteners are threadedly connected to the threaded holes on the overhead support seat 11. The fastener fixing method can facilitate the disassembly and assembly of the transverse plate 32.

[0050] From a vertical perspective, the length of the inclined elastic inclined plate 30 is longer than that of the vertical plate 31 so as to play a guiding role of the long contact surface.

[0051] Preferably, the inclined elastic inclined plate 30 in this embodiment is any one of a flat plate and a U-shaped plate with a contoured groove.

[0052] When the elastic force of the inclined elastic inclined plate 30 is restored after the demoulding process, the elastic force of the inclined elastic inclined plate 30 causes the stretched finished product to pop out of the downward stretching die 1. Then the next stretching process is circulated.

[0053] A discharge slope 101 is provided on the bottom plate 10 and is located at the lower side of the inclined elastic inclined plate 30 when the inclined elastic inclined plate 30 is in an inclined state. When the stretched finished part is ejected downward under the elastic force of the inclined elastic inclined plate 30, the discharge slope 101 forms a final discharge guide for the stretched finished part.

[0054] In order to prevent the finished stretched parts from being hit and damaged when they fall, a flexible block 32 is provided on the bottom plate 10. The flexible block 32 is made of rubber, etc. A splicing slope 320 with the same inclination angle as the discharge slope 101 is provided on the flexible block 32. The lower side of the splicing slope 320 is spliced ​​to the upper side of the discharge slope 101.

[0055] The flexible block 32 is a triangular block, and the vertical surface of the flexible block 32 abuts against the peripheral surface of the bottom support platform 100. The bottom support platform 100 is a square structure, and the vertical surface of the flexible block 32 abuts against one vertical surface of the bottom support platform 100.

[0056] Of course, the stretched finished parts guiding mechanism 3 in this embodiment can be replaced by a swinging pushing mechanism. For example, the stretched finished parts guiding mechanism 3 includes a swinging plate hinged on the upper side of the overhead support seat 11, and the swinging plate is connected to a swinging drive, which is hingedly mounted on the overhead support seat 11. The swinging drive is, for example, a pneumatic cylinder or an oil cylinder.

[0057] When the swing plate is tilted, it can form a material guide.

[0058] like Figure 3 , Figure 5-Figure 7 As shown, in order to realize automatic demoulding and protect the outer wall of the finished stretched part, a demoulding structure 4 for the stretched part is provided on the overhead support seat 11. The demoulding structure 4 for the stretched part can demould the stretched part from the upper stretching punch 2, and the demoulded finished stretched part is guided out by the finished stretched part guide mechanism 3.

[0059] Specifically, Figure 3 , Figure 5-Figure 7 As shown, the stretching piece demolding structure 4 of this embodiment includes an annular plate 40 fixed on the overhead support seat 11 and having a stretching piece through hole, the axial center line of the stretching piece through hole coincides with the axial center line of the stretching avoidance through hole 110, and the annular plate 40 is located above the stretching avoidance through hole 110. Of course, the annular plate 40 can also be set in the stretching avoidance through hole 110 or at the lower opening of the stretching avoidance through hole 110.

[0060] The annular plate 40 is fixed to the overhead support seat 11 by a plurality of countersunk bolts, that is, the top surface of the cap end of the countersunk bolt is flush with the upper surface of the annular plate 40, so as to prevent interference.

[0061] A plurality of demoulding claws 41 are hinged on the annular plate 40 and are evenly distributed along the circumferential direction of the through hole of the stretching member. At least part of the demoulding claws 41 extend into the through hole of the stretching member. A stripping elastic driving member 42 is provided between the annular plate 40 and the demoulding claws 41 so that the part of the demoulding claws 41 extending into the through hole of the stretching member has a material removal elastic driving member 42 that converges toward the axis of the through hole of the stretching member. When in the stretching processing stage, the demoulding claws 41 in this embodiment always hold the outer wall of the stretching member. When the lowest stretching process is completed, the part of the demoulding claws 41 extending into the through hole of the stretching member is separated from the outer wall of the stretching member. It can be understood that the demoulding claws 41 at this time are above the upper opening of the stretching member.

[0062] After the demoulding claws 41 are separated from the stretching piece, the demoulding claws 41 now hold the outer wall of the upper stretching punch 2. As the upper stretching punch 2 continues to descend, the upper end of the stretching piece is supported by the demoulding claws 41, so that the stretching piece can be separated from the upper stretching punch 2 downward.

[0063] Furthermore, a plurality of claw installation slots 400 evenly distributed in a circumference are provided on the upper surface of the annular plate 40, at least a portion of the demoulding claw 41 is hinged to the claw installation slot 400 through a hinge shaft 401, and the remaining portion of the demoulding claw 41 extends obliquely downward into the through hole of the stretching member.

[0064] like Figure 5-Figure 7 As shown, the demoulding claw 41 in this embodiment includes a transverse portion 410 and an inclined portion 411 connected to the inner side of the transverse portion 410 , and the transverse portion 410 and the inclined portion 411 form an obtuse angle.

[0065] The inner inclined surface of the inclined portion 411 is provided with an arc concave surface 412 , and all the arc concave surfaces 412 are coaxial. The arc concave surfaces 412 are shaped like the outer cylindrical surface of the drawing piece, and the arc concave surfaces 412 are shaped like the outer cylindrical surface of the upper drawing punch 2 .

[0066] The arc concave surface 412 of the demolding claw 41 can form an elastic hold for the stretched workpiece during stretching, which can improve the downward movement stability of the stretched workpiece during stretching processing. Secondly, the arc concave surface 412 can prevent the demolding claw 41 from being squeezed or bumped when it contacts the stretched workpiece or the upper stretching punch 2, for example, the stretched workpiece or the upper stretching punch 2 is squeezed or bumped.

[0067] The elastic driving member 42 for material stripping is a spring, which is distributed vertically or obliquely, and the upper end of the elastic driving member 42 abuts against the demoulding claw 41, and the lower end of the elastic driving member 42 abuts against the bottom of the claw mounting station groove 400. In order to prevent stripping, a spring-inserted blind hole is provided at the bottom of the claw mounting station groove 400, and the lower end part of the elastic driving member 42 for material stripping is inserted into the spring-inserted blind hole.

[0068] A circular arc tip 413 is provided at the lower end of each inclined portion 411, and the circular arc tip 413 contacts the center position of the upper end surface of the drawing piece. At this time, the circular arc tip 413 can avoid squeezing the outer cylindrical surface of the upper drawing punch 2 during demolding.

[0069] In the preferred embodiment, there are 3-N demoulding claws 41. The demoulding claws 41 formed in a circle can effectively form a uniform force demoulding for the stretched part in the circumferential direction, and can prevent the stretched part from being subjected to a single point force or edge extrusion and curling, which seriously causes the inner wall of the stretched part to stretch or crack.

[0070] The demoulding structure 4 of the stretched part of this embodiment can not only guide the stretched part during the stretching process, but also elastically hold the stretched part in the radial direction to improve the stretching quality. Secondly, after the stretching is completed, the demoulding structure 4 of the stretched part can also demould the stretched part to the upper stretching punch 2 to meet the purpose of mechanical automatic demoulding, which can greatly improve production efficiency.

[0071] At the same time, the specific structure of the drawing component demoulding structure 4 of the present application can prevent damage to the upper drawing punch 2 and the drawing component, thereby extending the service life of the drawing device.

[0072] The inner side of the claw installation station groove 400 is connected to the through hole of the drawing member, and the edge of the connection between the through hole of the drawing member and the claw installation station groove 400 can limit the demoulding claw 41 when it rotates downward around the hinge axis.

[0073] The multi-layer stretching die ring 12 includes a bottommost stretching die ring and at least one upper stretching die ring located above the bottommost stretching die ring. In this embodiment, there are two upper stretching die rings which are spaced apart from each other. The upper and lower spacing distance of the multi-layer stretching die ring 12 is determined by the stretching stroke of the stretching component.

[0074] like Figure 1 , Figure 8-Figure 10 As shown, each layer of the stretching die ring 12 is fixed by a quick-disassembly assembly mechanism. Specifically, at least one fixed plate 13 is provided on the top of the overhead support seat 11, which is spaced from the top of the overhead support seat 11 or directly fixed to the top of the overhead support seat 11. In the spacing scheme: the lowest fixed plate 13 closest to the overhead support seat 11 is fixed to the top of the overhead support seat 11 by two pads 14. When there are multiple fixed plates 13 distributed from top to bottom, the two adjacent fixed plates 13 are also connected by two pads 14. The two pads 14 are parallel to each other and the distance between the opposite facades of the two pads 14 is less than the length or width of the fixed plate 13. This is convenient for the installation of the fixed plate 13, and at the same time, it is convenient for the subsequent material pulling mechanism to hook the lower surface of the fixed plate 13 to pull the material.

[0075] The fixed plate 13 is provided with a stretching avoidance hole, and the stretching die ring 12 is fixed to the top of the overhead support seat 11 through a quick disassembly mechanism ( Figure 1 Not shown, please refer to Figure 8-Figure 10 ), and the stretching die ring 12 is fixed to the upper surface of the fixed plate body 13 through a quick disassembly mechanism.

[0076] Specifically, the quick-disassembly mechanism of this embodiment includes two guide blocks 18 arranged on the top of the overhead support seat 11 or on the upper surface of the fixed plate body 13. The guide blocks 18 are of a right-angle structure. A guide groove body is formed between the two guide blocks 18. The stretching die ring 12 is fixed on the plug-in slide 15. The plug-in slide 15 is inserted into the guide groove body to form a sliding fit. A fixed backing 16 is provided at one end of the guide groove body. When one side of the plug-in slide 15 abuts against the fixed backing 16, it means that the plug-in slide 15 has slid into place. After sliding into place, the plug-in slide 15 is locked by a fastener body on the side of the plug-in slide 15 away from the fixed backing 16, that is, the plug-in slide 15 cannot move relative to the overhead support seat 11, and the plug-in slide 15 cannot move relative to the fixed plate body 13.

[0077] The fastener body is, for example, a latch pin, which is inserted into a latch pin blind hole on the top of the plug-in slide plate 15 and the overhead support seat 11 .

[0078] A handle 150 is provided on the peripheral surface of one side of the plug-in slide plate 15 away from the fixed backing 16. The handle 150 facilitates the disassembly and assembly operation.

[0079] A die mounting hole is provided in the central area of ​​the plug-in slide 15, and the stretching die ring 12 is fixed in the die mounting hole. At the same time, a circulating cooling channel 150 is provided inside the plug-in slide 15. The circulating cooling channel 150 is preferably in a disc-shaped spiral structure. Both ends of the circulating cooling channel 150 are connected to a refrigerant storage through an external pipeline. The refrigerant medium can be water. A power pump is provided on the external pipeline.

[0080] When the power pump is turned on, the refrigerant can enter the circulating cooling channel 150 , and heat exchange can be formed with the stretching die ring 12 at this time, so as to extend the service life of the stretching die ring 12 .

[0081] A protective plate 151 is provided on the upper surface of the plug-in slide plate 15 , and a avoidance hole body connected to the upper end of the forming chamber of the stretching die ring 12 is provided on the protective plate 151 . The diameter of the avoidance hole body is equal to or slightly larger than the upper inner diameter of the forming chamber of the stretching die ring 12 .

[0082] And the axis center line of the avoidance hole body coincides with the axis center line of the stretching die ring 12, so that the hole wall of the avoidance hole body is flush with the upper inner wall of the molding chamber.

[0083] When in the fixed state, the transverse sub-blocks of the guide block 18 are restricted to the opposite sides of the upper surface of the plug-in slide 15, and at the same time, the four lateral directions of the plug-in slide 15 are restricted under the restriction of the positioning backing and the latch.

[0084] The above method can realize the sliding withdrawal of the plug-in slide 15, and the withdrawal can make the stretching die ring 12 arranged on the plug-in slide 15 be withdrawn synchronously, which can improve the replacement efficiency of different stretching die rings 12, shorten the downtime caused by replacing the stretching die ring 12, and invisibly improve the production efficiency.

[0085] Secondly, the above method can also meet the usage requirements.

[0086] Of course, the above-mentioned latch pin can be replaced by a detachable positioning backing block 17, that is, the detachable positioning backing block 17 is fixed to the plug-in slide plate 15 by means of bolts or positioning pins.

[0087] When there are multiple fixed plates 13, the outer diameters of the fixed plates 13 are equal or gradually increase from top to bottom. The material pulling mechanism is installed on the upper drawing punch 2, and the lifting and lowering of the upper drawing punch 2 will drive the material pulling mechanism to lift and lower synchronously.

[0088] Specifically, Figure 3 and Fig.11 As shown, the upper stretching punch 2 of this embodiment includes a multi-layer combined stretching punch 20, and an upper driving plate 21 and a lower driving plate 22 spaced apart and parallel from top to bottom.

[0089] The multi-layer combined stretching punch 20 comprises a stretching punch 200 and at least one first forming sleeve 201 . The first forming sleeve 201 is sleeved on the lower end of the stretching punch 200 , and the stretching punch 200 and the first forming sleeve 201 are slidably matched.

[0090] The first forming sleeve 201 is a primary stretching process, and the stretching punch 200 is a secondary stretching process. Of course, multiple first forming sleeves 201 that slide together and whose outer diameters gradually decrease from the outside to the inside can be designed according to the actual stretching depth.

[0091] The upper end of the first forming sleeve 201 is fixed to the lower driving plate 22, and the upper end of the stretching punch 200 is fixed to the upper driving plate 21. The lower driving plate 22 drives the first forming sleeve 201 to rise and fall, and the upper driving plate 21 drives the stretching punch 200 to rise and fall.

[0092] The lower end of the stretching punch 200 is provided with a punch core 202, which is cylindrical, and the diameter of the stretching punch 200 is equal to the diameter of the punch core 202. The first forming sleeve 201 is sleeved on the punch core 202, and the hardness provided by the punch core 202 is consistent with the hardness of the first forming sleeve 201, or the hardness of the first forming sleeve 201 is higher than the hardness of the punch core 202, for example, through heat treatment such as quenching. The length of the punch core 202 is longer than the length of the first forming sleeve 201.

[0093] A reduced diameter section 203 is provided at the lower end of the stretching punch 200, and a reduced diameter section matching blind hole with an open upper end is axially provided in the punch core 202, that is, the lower end of the punch core 202 is closed, and the reduced diameter section 203 is inserted into the reduced diameter section matching blind hole, and the two are fixedly connected by interference fit, or the two are connected by threaded connection.

[0094] A molding sleeve mounting hole 220 is provided on the lower driving plate 22, and the upper end of the first molding sleeve 201 extends into the molding sleeve mounting hole 220. A flange 204 is provided on the first molding sleeve 201, and the flange 204 is fixed to the lower surface of the lower driving plate 22 by a plurality of flange 204 bolts. A cooling circulation system for cooling the first molding sleeve 201 is provided inside the lower driving plate 22, and the cooling circulation system refers to the above-mentioned cooling structure of the stretching die ring 12.

[0095] The upper end of the stretching punch rod 200 passes through the upper driving plate 21 , and a fixing seat body 23 which is tightly sleeved on the upper end of the stretching punch rod 200 is provided on the upper surface of the upper driving plate 21 .

[0096] The multi-layer combined drawing punch 20 in this embodiment can realize continuous coaxial drawing processing at different drawing depths in the axial direction of the same vertical axis, which can ensure the drawing processing quality of the drawn part and the drawing coaxiality of the drawn part in different drawing processing steps. When the drawn part is a circular cylindrical part, the roundness of the drawn part can be improved.

[0097] Secondly, the multi-layer combined stretching punch 20 of the present application can be adapted to different process requirements.

[0098] The stretching punch 200 is any one of a hollow rod and a solid rod with a closed lower end. The stretching punch 200 is any one of a cylindrical punch and a square punch, and the first forming sleeve 201 is any one of a cylindrical forming sleeve and a square forming sleeve.

[0099] When a cylindrical punch is selected, a cylindrical forming sleeve is selected.

[0100] When a hollow rod is used, Fig.12As shown, a circulating cooling water core 24 for cooling the punch rod core 202 is provided in the stretching punch 200. Specifically, a water core insertion blind hole 200a with an open upper end is provided in the axial direction of the stretching punch 200, and a water inlet 200b and a water outlet 200c are provided at the upper end of the stretching punch 200. The circulating cooling water core 24 is cylindrical and the top end of the circulating cooling water core 24 is closed. The circulating cooling water core 24 is a metal tube. At least part of the outer diameter of the circulating cooling water core 24 is smaller than the hole diameter of the water core insertion blind hole 200a, and the circulating cooling water core 24 is inserted into the water core insertion blind hole 200a, and a spacing space 200d is left between the bottom of the water core insertion blind hole 200a and the lower end of the circulating cooling water core 24, and a section of the circulating cooling water core 24 with an outer diameter smaller than the hole diameter of the water core insertion blind hole 200a and the water core insertion blind hole 200a form an annular space 200e, the water inlet 200b is connected to the inside of the circulating cooling water core 24, and the water outlet 200c is connected to the annular space 200e. A connecting hole 200f is provided at the upper end of the circulating cooling water core 24 to connect the water inlet 200b with the inside of the circulating cooling water core 24.

[0101] The water inlet 200b and the water outlet 200c are connected to the cold water tank through pipelines, and a power circulation pump is provided on the pipelines.

[0102] When the power circulation pump is turned on, the water in the cold water tank passes through the water inlet 200b, the connecting hole 200f, the internal space of the circulating cooling water core 24, the spacing space 200d, the annular space 200e and the water outlet 200c in sequence, and finally returns to the cold water tank, forming a cooling cycle by the above process. The cooling cycle can cool the punch rod core 202 and the first molding sleeve 201 to different degrees to extend the service life of the multi-layer combined stretching punch 20.

[0103] Furthermore, the upper end of the circulating cooling water core 24 is sealed and connected to the opening of the blind hole 200a. Specifically, a sealing ring 240 is provided at the upper end of the circulating cooling water core 24, and the sealing ring 240 contacts the hole wall of the blind hole 200a to form a seal.

[0104] A removable top cover 200g is provided on the top of the stretching punch 200, the upper end surface of the circulating cooling water core 24 contacts the lower surface of the removable top cover 200g, and a locking screw 200h threadedly connected between the lower end and the upper end of the circulating cooling water core 24 is passed through the removable top cover 200g.

[0105] The circulating cooling water core 24 includes an upper large outer diameter section and a lower small outer diameter section connected to the lower end of the upper large outer diameter section. The upper large outer diameter section and the water core inserted into the blind hole 200a are matched with a very small gap, and a sealing ring 240 groove is provided on the outer wall of the upper large outer diameter section, and at least part of the sealing ring 240 is in the sealing ring 240 groove. The lower small outer diameter section and the water core inserted into the blind hole 200a form the above-mentioned annular space 200e, and the lower end of the lower small outer diameter section and the bottom of the water core inserted into the blind hole 200a form the above-mentioned spacing space 200d.

[0106] The water inlet 200b and the water outlet 200c are both disposed at the upper end of the stretching punch 200, so that the cooling water has a longer flow path to improve the cooling efficiency. The water inlet 200b and the water outlet 200c are spaced apart from each other to make the pipe connection more convenient.

[0107] like Figure 3 , Fig.13 and Fig.14 As shown, several fixed plates 13 have a fixed plate 13 at the highest position. The material pulling mechanism described above includes at least two material pulling hooks 25 whose upper ends are hinged to the opposite sides of the lower driving plate 22. When the lower driving plate 22 drives the first forming sleeve 201 to descend and performs the first stretching and forming, the material pulling hook 25 at this time follows the lower driving plate 22 to descend synchronously. Because the material pulling hook 25 is in a hinged state, the material pulling hook 25 will swing outward when it contacts the highest fixed plate 13. When the hook portion of the material pulling hook 25 descends to the lower surface of the fixed plate 13, the hook portion of the material pulling hook 25 is hooked to the lower surface of the fixed plate 13 by the transverse driving spring 250 arranged between the lower driving plate 22 and the outer side of the material pulling hook 25. The material pulling hook 25 can connect the lower driving plate 22 and the highest fixed plate 13, playing a stabilizing role. At this time, when performing the first stretching and forming, the displacement of the highest fixed plate 13 can be prevented.

[0108] Taking two material pulling hooks 25 as an example, the transverse driving spring 250 always has a tendency to make the hook parts of the material pulling hooks 25 move toward each other.

[0109] The upper driving plate 21, the lower driving plate 22 and the fixed plate body 13 are connected by a vertical guide mechanism, which includes any one of a guide rail pair and a guide sleeve / rod pair. The vertical guide mechanism includes a plurality of guide posts 213 arranged on the lower surface of the upper driving plate 21, and guide holes or guide sleeves 214 for inserting the guide posts one by one are respectively arranged on the lower driving plate 22 and the fixed plate body 13 to form a guide for the lifting movement.

[0110] Specifically, a U-shaped block 26 is provided on the lower surface of the lower driving plate 22, and the upper end of the pulling hook 25 is placed in the U-shaped groove of the U-shaped block 26. The U-shaped block 26 and the upper end of the pulling hook 25 are connected by a longitudinal hinge shaft 27 which is relatively perpendicular to the horizontal driving spring 250.

[0111] A closing block 28 is provided at the opening of the U-shaped block 26 , one end of the transverse driving spring 250 abuts against the outer side surface of the material pulling hook 25 , and the other end of the transverse driving spring 250 abuts against the closing block 28 .

[0112] The transverse drive spring 250 is located at the outer side and below the longitudinal hinge shaft.

[0113] Preferably, there are four material pulling hooks 25 in this embodiment, two of which are distributed on one side of the two opposite sides of the lower driving plate 22 , and the other two of which are distributed on the other side of the two opposite sides of the lower driving plate 22 .

[0114] When the material pulling hook 25 contacts the bottom of the U-shaped groove, it is in an upright state. At this time, the material pulling hook 25 hooks the lower surface of the highest fixed plate 13. When the material pulling hook 25 swings outward, it separates from the lower surface of the lower driving plate 22.

[0115] The hook portion of the material pulling hook 25 can be understood as a detour portion, with an upper chamfer 251 on the upper side of the hook portion and a lower chamfer 252 on the lower side of the hook portion. The upper chamfer and the lower chamfer play a guiding role when contacting the highest fixed plate 13, avoiding jamming and facilitating the cancellation of material pulling tension after demolding.

[0116] like Figure 1 and Fig. 20 As shown, a plurality of pull rods 215 are installed on the lower driving plate 22, and the upper ends of the pull rods 215 are slidably matched with the upper driving plate 21, and an anti-slip cap 216 is provided at the upper end of the pull rods 215. When the pulling hook 25 pulls the lower surface of the highest fixed plate body 13 and is about to remove the material and stretch the parts, the upper driving plate 21 rises at this time, and the anti-slip cap 216 at the upper end of the pull rod 215 blocks the upper surface of the upper driving plate 21, and the transverse driving spring 250 is forced to stretch when affected by the continuously rising upper driving plate 21, and the hook part of the pulling hook 25 can be separated from the lower surface of the fixed plate body 13 at this time.

[0117] Of course, a pull rod hole 217 is provided on the upper driving plate 21, and the pull rod 215 and the pull rod hole 217 are slidably matched. A countersunk hole 218 is provided at the upper hole mouth of the pull rod hole 217, and the anti-drop cap 216 and the countersunk hole 218 are slidably matched. When the anti-drop cap 216 contacts the bottom of the countersunk hole 218, the lower driving plate 22 and the upper driving plate 21 can rise together in the vertical direction at this time, so that the hook part of the pulling hook 25 can be separated from the lower surface of the fixed plate body 13.

[0118] like Figure 1 , Figure 3 and Fig.15As shown, in order to realize the linkage of the multi-layer driving plates, the present embodiment further provides a multi-layer driving plate linkage loosening mechanism 5, which is used for the linkage and mutual loosening of the upper driving plate 21 and the lower driving plate 22, and plays the switching function of linkage and loosening.

[0119] Specifically, Figure 1 , Figure 3 and Fig.15 As shown, the multi-layer drive plate linkage release mechanism 5 includes at least two mutually parallel lock tongue guides 50, the lower end of each lock tongue guide 50 downwardly penetrates the lower drive plate 22 and the lower end of the lock tongue guide 50 and the lower drive plate 22 are relatively fixed, and the lower end of the lock tongue guide 50 has an exposed end 500 exposed below the lower surface of the lower drive plate 22, and the upper end of each lock tongue guide 50 is slidably connected to the upper drive plate 21 in the vertical direction.

[0120] Preferably, the bolt guide strips 50 of this embodiment have roots and are distributed in a cross shape.

[0121] Of course, in order to ensure stability, Figure 1 , Figure 3 and Fig.15 As shown, a contoured groove 140 is provided on the top surface of the guide block 18 on the highest fixed plate 13. The contoured groove 140 is contoured to the exposed end 500. The exposed end 500 enters the contoured groove 140 to form a lifting guide. At the same time, when the exposed end 500 contacts the bottom of the contoured groove 140, the lower driving plate 22 drives the first forming sleeve 201 to complete the stretching process.

[0122] During the stretching process of the first forming sleeve 201, the stretching punch 200 is always inserted in the first forming sleeve 201, so that the first forming sleeve 201 has a relatively high strength, especially radial strength. If the punch core 202 is not provided, the lower end surface of the stretching punch 200 is flush with the lower end surface of the first forming sleeve 201. If the punch core 202 is provided, the lower end surface of the punch core 202 is flush with the lower end surface of the first forming sleeve 201.

[0123] like Figure 1 , Figure 3 and Fig.15As shown, a guide bar 51 is slidably matched on the outer side of each lock tongue guide bar 50, the lower end of the guide bar 51 is fixed to the lower driving plate 22, the upper end of the guide bar 51 is slidably matched with the upper driving plate 21, a locking block 52 is provided on the upper driving plate 21, the locking block 52 and the lock tongue guide bar 50 are vertically distributed, the locking block 52 and the guide bar 51 are vertically distributed, the locking block 52 and the upper driving plate 21 are slidably connected, a track groove 210 or a track hole for the locking block 52 to slide is provided on the upper driving plate 21, a lock block driving member 54 is installed in the track groove 210, the lock block driving member 54 is a spring, one end of the lock block driving member 54 abuts against the outer end of the lock block 52, and the other end of the lock block driving member 54 abuts against the blocking portion 53 at the outer end of the track groove 210.

[0124] The locking block driving member 54 makes the locking block 52 have a tendency to move toward the locking tongue guide strip 50 and the guide strip 51 side.

[0125] like Fig.15 and Fig.16 As shown, a first sliding groove 211 slidably matched with the locking tongue guide strip 50 and a second sliding groove 212 slidably matched with the guide strip 51 are provided on the upper driving plate 21 .

[0126] like Figure 3 , Fig.15 , Fig.18 and Fig.19 As shown, a first unlocking inclined surface 501 is provided at the top of the lock tongue guide strip 50, the top of the guide strip 51 is lower than the top of the lock tongue guide strip 50, a first horizontal locking plane 510 is provided at the top of the guide strip 51, and a second inclined surface 511 connected to the first horizontal locking plane 510, a second unlocking inclined surface 520 matching the first unlocking inclined surface 501 is provided at the inner end of the locking block 52, a second horizontal locking plane 521 matching the first horizontal locking plane 510 is provided on the bottom surface of the inner end of the locking block 52, the second inclined surface 511 and the first unlocking inclined surface 501 have the same inclination angle, and the first unlocking inclined surface 501 is located above and to the side of the second inclined surface 511, and the lower side edge of the first unlocking inclined surface 501 is lower than the upper side edge of the second inclined surface 511.

[0127] The second unlocking inclined surface 520 can be matched with the first unlocking inclined surface 501 , or the second unlocking inclined surface 520 can be matched with the second inclined surface 511 , and the match indicates that the inclination angles are consistent.

[0128] During the primary stretching, the second horizontal locking plane 521 on the bottom surface of the locking block 52 coincides with the first horizontal locking plane 510 and the second unlocking inclined surface 520 at the inner end of the locking block 52 coincides with the first unlocking inclined surface 501. At this time, the distance between the upper driving plate 21 and the lower driving plate 22 is locked by the locking tongue guide bar 50 and the guide bar 51. When the upper driving plate 21 moves downward, it can drive the first molding sleeve 201 on the lower driving plate 22 to perform the primary stretching process downward.

[0129] When the exposed end portion 500 of the lower end of the locking tongue guide strip 50 contacts the top surface of the guide block 18 on the highest fixed plate 13, the first forming sleeve 201 completes the stretching process, that is, the first forming sleeve 201 cannot be lowered any further, that is, the primary stretching is completed.

[0130] When the secondary stretching is performed, the upper driving plate 21 continues to descend. Since the lower end of the locking tongue guide strip 50 is supported by the guide block 18, the locking tongue guide strip 50 and the guide strip 51 are in a fixed state at this time, and the upper driving plate 21 that descends further will cause the first unlocking inclined surface 501 of the locking tongue guide strip 50 and the second unlocking inclined surface 520 of the locking block 52 to cancel the match. When the first unlocking inclined surface 501 and the second unlocking inclined surface 520 of the locking block 52 cancel the match, the second horizontal locking plane 521 will be separated from the first horizontal locking plane 51. 0 translational thrust, at this time, the locking block driving member 54 is elastically compressed, and the second unlocking inclined surface 520 detached from the first unlocking inclined surface 501 will coincide with the second inclined surface 511 arranged at the top of the guide strip 51. At this time, the lower end of the stretching punch 200 extends out of the lower end of the first forming sleeve 201 for secondary stretching processing. As the stretching depth continues to deepen (that is, the upper driving plate 21 continues to descend), the first unlocking inclined surface 501 will detach from the lower side of the second inclined surface 511 and the locking block 52 will continue to descend along the guide strip 51 to complete the secondary stretching processing.

[0131] Preferably, the guide strip 51 of this embodiment has a U-shaped cross section, and the lock tongue guide strip 50 is inserted into the guide strip 51 .

[0132] Secondly, the U-shaped guide strip 51 is divided into two opposite side portions and a central portion connected to the two opposite side portions, a second inclined surface 511 is provided on the top of the central portion, and a second horizontal locking plane 521 is provided on the top surfaces of the two opposite side portions.

[0133] When all the stretching processes are completed, the upper driving plate 21 is reset and the lower driving plate 22 is also reset. After resetting, the second horizontal locking plane 521 on the bottom surface of the locking block 52 when the locking block 52 is in the first-level stretching state coincides with the first horizontal locking plane 510 and the second unlocking inclined surface 520 at the inner end of the locking block 52 coincides with the first unlocking inclined surface 501, and the exposed end 500 is out of the contoured groove 140.

[0134] The working principle of this embodiment is as follows:

[0135] S1. The metal stamping cup a is pre-placed in the highest position of the drawing die ring 12.

[0136] S2, the first forming sleeve 201 of the multi-layer combined stretching punch 20 moves downward in a state where the upper driving plate 21 and the lower driving plate 22 are relatively locked, that is, the metal stamping cup a in the highest position stretching die ring 12 is subjected to primary stretching processing to obtain a primary stretching part. During the primary stretching, the material pulling mechanism at this time is tightened on the highest position fixed plate body 13. Of course, during the secondary stretching, the tightening mechanism at this time is also tightened on the highest position fixed plate body 13.

[0137] S3. When the exposed end 500 of the locking tongue guide strip 50 abuts against the top surface of the guide block 18 on the highest fixed plate 13, the first forming sleeve 201 is stretched into place.

[0138] S3, the upper driving plate 21 continues to descend in step S3, and the relative locking of the upper driving plate 21 and the lower driving plate 22 is cancelled. At this time, the lower end of the stretching punch 200 extends out of the lower end of the first forming sleeve 201, and the primary stretching part is subjected to secondary stretching processing in the stretching die ring 12 below the highest stretching die ring 12 to obtain a secondary stretching part.

[0139] After S4 and S3 are completed, the upper driving plate 21 is reset upward. At this time, the secondary stretching piece follows the stretching punch 200 upward, and the demolding claws 41 of the stretching piece demolding structure 4 on the lower stretching die 1 elastically hold the secondary stretching piece and as the upper stretching punch 2 continues to descend, the upper end of the stretching piece is supported by the demolding claws 41. At this time, the upper stretching punch 2 rises again to achieve the purpose of the stretching piece being separated downward from the upper stretching punch 2.

[0140] S5. During the secondary stretching, the stretched piece will contact the inclined elastic inclined plate 30. After S4 is completed, the inclined elastic inclined plate 30 at this time makes the stretched piece deviate from the inclined direction of falling straight line to be removed, that is, the stretched piece is processed.

[0141] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A multi-layer combined stretch punch, comprising a stretch punch rod (200), characterized in that: The multi-layer combined stretching punch structure further comprises at least one first forming sleeve (201), the first forming sleeve (201) being sleeved on the lower end of the stretching punch (200), and the stretching punch (200) and the first forming sleeve (201) being slidably matched, the lower end of the stretching punch (200) being flush with the lower end of the first forming sleeve (201) during primary stretching, and the lower end of the stretching punch (200) being extended beyond the lower end of the first forming sleeve (201) during secondary stretching.

2. The multi-layer combined stretch punch according to claim 1, characterized in that: A punch core (202) is provided at the lower end of the stretching punch (200), and the first forming sleeve (201) is sleeved on the punch core (202).

3. The multi-layer combined stretch punch according to claim 2, characterized in that: The diameter of the stretching punch (200) is equal to the diameter of the punch core (202).

4. The multi-layer combined stretch punch according to claim 2 or 3, characterized in that: A reduced diameter section (203) is provided at the lower end of the stretching punch (200), and a reduced diameter section matching blind hole with an open upper end is axially provided on the punch core (202), and the reduced diameter section (203) is fixed in the reduced diameter section matching blind hole.

5. The multi-layer combined stretch punch according to claim 1, characterized in that: A flange (204) is provided on the first forming sleeve (201).

6. The multi-layer combined stretch punch according to claim 1, characterized in that: The stretching punch rod (200) is any one of a solid rod and a hollow rod with a closed lower end.

7. The multi-layer combined stretch punch according to claim 2, characterized in that: The length of the punch core (202) is longer than the length of the first forming sleeve (201).

8. The multi-layer combined stretch punch according to claim 1, characterized in that: The stretching punch (200) is any one of a cylindrical punch and a square punch, and the first forming sleeve (201) is any one of a cylindrical forming sleeve and a square forming sleeve.

9. The upper stretching punch is characterized by: The upper stretching punch comprises the multi-layer combined stretching punch described in any one of claims 1-8.

10. A stretching device, characterized in that: The stretching device includes the upper stretching punch described in claim 9.

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