A multi-station continuous metal sheet stamping and stretching forming equipment

Abstract

This invention discloses a multi-station continuous metal sheet stamping and stretching forming equipment, belonging to the field of metal processing technology. It includes a worktable with multiple sets of cooperating dies and punches. A transfer mechanism for driving the punches and dies to close is provided on the worktable. Dies are evenly arranged on the top wall of the worktable. Annular grooves are evenly formed on the worktable, filled with lubricating oil. Each annular groove corresponds to a die and covers the outside of the die. A circular plate is slidably installed within the annular groove. This design, through the cooperation of the annular grooves, circular plate, annular holes, and oil spraying mechanism, allows the lubricating oil in the annular grooves to be discharged through the annular holes and sprayed onto the surface of the rounded corner area of ​​the die during the process of placing the sheet metal to be processed on the die surface. This reduces the frictional force on the rounded corner area when the sheet metal contacts the die, thereby reducing the frictional force on the die during operation.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, and more specifically, to a multi-station continuous metal sheet stamping and stretching forming equipment. Background Technology

[0002] Stamping is a forming process that uses a press and dies to apply external force to sheet metal, strip, tube, and profiles, causing plastic deformation or separation to obtain workpieces of the desired shape and size. Stamping processes include various techniques such as punching, bending, shearing, and stretching.

[0003] In order to improve production efficiency, multi-station sheet metal stretching and forming equipment usually adopts a multi-station synchronous feeding mode during continuous operation. However, under long-term operating conditions, the key component of the equipment—the forming die—will experience progressive wear due to continuous cyclic loads.

[0004] It is worth noting that for workpieces requiring only a single, shallow stretching operation, the wear at different stations often exhibits non-uniform characteristics due to factors such as uneven force distribution at each station, differences in material flow characteristics, and fluctuations in process parameters. Specifically, in the initial stage of sheet metal stretching, the blank holder first compresses the sheet metal, and then the punch descends, causing the material to plastically flow and gradually enter the die. During this process, the sheet metal mainly experiences intense relative sliding with the die's fillet area, generating significant friction due to the large contact pressure. This friction not only hinders uniform material flow but also easily induces adhesive wear or abrasive wear in the die's fillet area. Long-term accumulation will lead to increased die surface roughness and out-of-tolerance fillet dimensions, ultimately affecting the forming accuracy and surface quality of the workpiece.

[0005] To address this, a multi-station continuous metal sheet stamping and stretching forming equipment is proposed. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a multi-station continuous metal sheet stamping and stretching forming equipment, which can reduce the wear of the mold through lubrication, thereby improving the workpiece accuracy and surface quality.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A multi-station continuous metal sheet stamping and stretching forming equipment includes a worktable with multiple sets of cooperating dies and punches on the worktable.

[0009] The worktable is equipped with a transfer mechanism for driving the punch and die to close;

[0010] The dies are evenly arranged on the top wall of the worktable;

[0011] The worktable is evenly provided with annular grooves, which are filled with lubricating oil. The annular grooves correspond one-to-one with the die cavity, and the annular grooves cover the outside of the die cavity.

[0012] A circular plate is slidably installed in the annular groove. An annular cavity is opened on the circular plate. An annular hole communicating with the outside is opened on the side wall of the cavity. An oil spraying mechanism is provided on the worktable to allow the lubricating oil in the annular groove to be discharged through the annular hole.

[0013] A groove is provided on the top wall of the annular plate, and a suction cup with its opening facing upward is fixedly installed in the groove. A negative pressure mechanism is provided on the worktable to keep the suction cup in a negative pressure state.

[0014] Furthermore, the transfer mechanism includes a bracket fixedly installed on the top wall of the worktable, on which hydraulic cylinders with output ends corresponding one-to-one with the concave molds are vertically fixedly installed, and the convex molds are fixedly installed on the output ends of the hydraulic cylinders.

[0015] Furthermore, the oil injection mechanism includes a first elastic bellows fixedly installed between the bottom wall of the annular groove and the bottom wall of the circular plate. The first elastic bellows has openings at both ends and holes on its side wall. The holes are located below the lubricating oil level in the annular groove, and a through hole is provided on the bottom wall of the cavity. The bottom end of the through hole is connected to the top end of the first elastic bellows.

[0016] Furthermore, the negative pressure mechanism includes an airbag fixedly installed between the top wall of the punch and the bracket. A second corrugated pipe is fixedly installed on the output end of the airbag, and the end of the second corrugated pipe away from the airbag extends to the inner bottom wall of the suction cup. A storage groove penetrating the top wall of the worktable is opened on the side wall of the annular groove, and the storage groove cooperates with the second corrugated pipe.

[0017] Furthermore, an annular cavity is formed on the side wall of the annular groove, and multiple layers of wire mesh are fixedly installed inside the annular cavity. A friction sleeve is fixedly embedded on the outer wall of the circular plate, and a heat-conducting rod extending into the through hole is fixedly installed on the side wall of the friction sleeve.

[0018] Furthermore, the suction cup includes a rubber ring sleeve and an annular guide groove, the guide groove being formed on the top wall of the ring sleeve, and the bottom end of the second corrugated tube extending to the inner bottom wall of the guide groove.

[0019] Furthermore, the second corrugated pipe is equipped with a spiral steel wire.

[0020] Furthermore, an installation groove is provided on the top wall of the workbench, and the die can be detachably installed in the installation groove. Insertion holes are evenly and vertically provided on the inner bottom wall of the installation groove, and insertion rods corresponding to the insertion holes are evenly and fixedly installed on the bottom wall of the die.

[0021] Furthermore, a magnet is fixedly installed on the bottom wall of the socket, the plug rod is made of magnetic material, and the plug rod and the magnet attract each other.

[0022] Furthermore, a flow guiding cavity is provided on the workbench, and each insertion hole is connected to the flow guiding cavity. A third corrugated pipe is inserted into the side wall of the second corrugated pipe, and the end of the third corrugated pipe away from the second corrugated pipe extends into the flow guiding cavity.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) This solution uses the cooperation of annular groove, annular plate, annular hole and oil spraying mechanism to place the plate to be processed on the surface of the die. Under the action of the oil spraying mechanism, the lubricating oil in the annular groove is discharged through the annular hole and sprayed onto the surface of the rounded corner area of ​​the die. This reduces the friction force on the rounded corner area when the plate comes into contact with the rounded corner area of ​​the die, thereby reducing the friction force on the die during the working process.

[0025] (2) This solution uses the cooperation of negative pressure mechanism and suction cup. Under the action of negative pressure mechanism, suction cup is adsorbed on the bottom wall of plate, so that plate and ring plate can be fixed together. When punch contacts plate and applies pressure to plate, it can prevent plate from sliding on horizontal plane and improve processing accuracy.

[0026] (3) In this scheme, through the cooperation of wire mesh, friction sleeve and heat-conducting rod, during the movement of the ring plate, the ring plate drives the friction sleeve and wire mesh to generate relative displacement. At this time, the friction sleeve and wire mesh rub against each other, and the heat generated during the friction process is transferred to the through hole through the heat-conducting rod.

[0027] When the lubricating oil flows through the through hole, it can be heated, increasing the fluidity of the lubricating oil and enabling the lubricating oil adhering to the surface of the die to be evenly distributed.

[0028] (4) This solution uses the interlocking hole and the insert rod to restrict the die in the interlocking hole, thereby preventing the die from moving when the punch applies pressure to the sheet metal, ensuring the processing accuracy. At the same time, with the cooperation of the interlocking hole and the insert rod, the damaged die can be replaced in time, further improving the processing accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0031] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A;

[0032] Figure 4 For the present invention Figure 3Enlarged structural diagram at point B;

[0033] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point C;

[0034] Figure 6 This is a schematic diagram of the combined structure of the second corrugated pipe and the spiral steel wire of the present invention;

[0035] Figure 7 This is a bottom-view structural diagram of the present invention;

[0036] Figure 8 This is a schematic diagram of the suction cup structure of the present invention.

[0037] Explanation of markings in the diagram:

[0038] 1. Workbench; 2. Die; 3. Punch; 4. Annular groove; 5. Circular plate; 6. Cavity; 7. Annular hole; 8. Groove; 9. Suction cup; 901. Circular sleeve; 902. Guide channel; 10. Support; 11. Hydraulic cylinder; 12. First elastic bellows; 13. Hole; 14. Through hole; 15. Airbag; 16. Second bellows; 17. Wire mesh; 18. Friction sleeve; 19. Heat-conducting rod; 20. Spiral steel wire; 21. Insertion hole; 22. Insert rod; 23. Magnet; 24. Guide cavity; 25. Third bellows. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Please see Figures 1 to 8 A multi-station continuous metal sheet stamping and stretching forming equipment includes a worktable 1, on which multiple sets of cooperating dies 2 and punches 3 are provided.

[0042] The worktable 1 is equipped with a transfer mechanism for driving the punch 3 and the die 2 to close;

[0043] The cavities 2 are evenly arranged on the top wall of the worktable 1;

[0044] The worktable 1 is evenly provided with annular grooves 4, which are filled with lubricating oil. The annular grooves 4 correspond one-to-one with the die 2, and the annular grooves 4 cover the outside of the die 2.

[0045] A circular plate 5 is slidably installed in the annular groove 4. An annular cavity 6 is opened on the circular plate 5. An annular hole 7 communicating with the outside is opened on the side wall of the cavity 6. The worktable 1 is equipped with an oil spraying mechanism that allows the lubricating oil in the annular groove 4 to be discharged through the annular hole 7.

[0046] A groove 8 is provided on the top wall of the annular plate 5. A suction cup 9 with its opening facing upward is fixedly installed in the groove 8, and a negative pressure mechanism is provided on the worktable 1 to make the suction cup 9 a negative pressure state.

[0047] The transfer mechanism includes a bracket 10 fixedly installed on the top wall of the workbench 1. A hydraulic cylinder 11 with an output end corresponding to the die 2 is vertically fixedly installed on the bracket 10. The punch 3 is fixedly installed on the output end of the hydraulic cylinder 11.

[0048] During the process of placing the sheet material to be processed on the surface of the die 2, under the action of the oil spraying mechanism, the lubricating oil in the annular groove 4 is discharged through the annular hole 7 and sprayed onto the surface of the rounded corner area of ​​the die 2, thereby reducing the frictional force on the rounded corner area when the sheet material contacts the rounded corner area of ​​the die 2. Then, the hydraulic cylinder 11 is activated, and the output end of the hydraulic cylinder 11 drives the punch 3 to move towards the die 2. During this process, under the action of the negative pressure mechanism, the suction cup 9 is adsorbed onto the bottom wall of the sheet material, thereby fixing the sheet material and the annular plate 5 together. When the punch 3 contacts the sheet material and applies pressure to the sheet material, it can prevent the sheet material from sliding on the horizontal plane, thus improving the processing accuracy.

[0049] Because the lubricating oil flowing out of the annular hole 7 is difficult to distribute evenly on the surface of the die 2, the lubricating oil distribution is uneven in different parts of the plate surface. When the plate comes into contact with the surface of the die 2, it tends to slide on the horizontal plane.

[0050] When the punch 3 contacts the sheet metal to be processed and begins to apply pressure, the lubrication distribution between the bottom wall of the sheet metal and the surface of the die 2 is uneven. Under the action of the negative pressure mechanism, the sheet metal can be fixed together with the suction cup 9, thereby preventing the sheet metal from sliding on the horizontal plane, ensuring that the sheet metal is in the designated position, and improving the processing accuracy.

[0051] Then, the punch 3 continues to apply pressure to the sheet metal, and when the unevenly distributed lubricating oil between the sheet metal and the die 2 is squeezed out, the sheet metal and the die 2 come into close contact. At this time, the metal sheet slides on the rounded corner area and gradually bends. The bent sheet metal disengages from the suction cup 9. At the same time, under the action of the lubricating oil, the wear of the rounded corner area can be reduced, keeping the rounded corner area intact, thereby improving the processing accuracy and the surface quality of the product.

[0052] like Figure 4 , Figure 5As shown, the oil injection mechanism includes a first elastic bellows 12 fixedly installed between the bottom wall of the annular groove 4 and the bottom wall of the circular plate 5. The first elastic bellows 12 has openings at both ends, and holes 13 are provided on the side wall of the first elastic bellows 12. The holes 13 are located below the lubricating oil level in the annular groove 4, and a through hole 14 is provided on the bottom wall of the cavity 6. The bottom end of the through hole 14 is connected to the top end of the first elastic bellows 12.

[0053] When the annular plate 5 is not subjected to downward pressure, under the action of the elastic force of the first elastic bellows 12, the annular plate 5 is in a state of extending out of the annular groove 4.

[0054] Since the annular groove 4 is located outside the die 2, the plate to be processed is placed on the top wall of the annular plate 5 when the plate is placed.

[0055] Under the influence of gravity, the annular plate 5 will move down along the annular groove 4. At this time, the air pressure in the annular groove 4 will increase, and the lubricating oil in the annular groove 4 will be squeezed downward. The lubricating oil will pass through the hole 13 into the first elastic bellows 12, and then flow along the first elastic bellows 12 and the through hole 14 into the cavity 6. Finally, it will be discharged through the annular hole 7. At this time, the lubricating oil discharged from the annular hole 7 will flow to the surface of the rounded corner area of ​​the die 2.

[0056] like Figure 2 , Figure 4 As shown, the negative pressure mechanism includes an airbag 15 fixedly installed between the top wall of the punch 3 and the bracket 10. A second corrugated pipe 16 is fixedly installed on the output end of the airbag 15, and the end of the second corrugated pipe 16 away from the airbag 15 extends to the inner bottom wall of the suction cup 9. A receiving groove penetrating the top wall of the worktable 1 is opened on the side wall of the annular groove 4. The receiving groove cooperates with the second corrugated pipe 16. When the annular plate 5 retracts into the annular groove 4, the second corrugated pipe 16 enters into the receiving groove, so that the annular plate 5 can retract normally.

[0057] The material to be processed is placed on the top wall of the circular plate 5, and the material covers the surface of the suction cup 9.

[0058] As the output end of the hydraulic cylinder 11 extends, the punch 3 gradually stretches the air bag 15. At this time, the air bag 15 draws air from the space between the suction cup 9 and the bottom wall of the plate through the second bellows 16, so that the space is in a negative pressure state, and the plate is fixed together with the suction cup 9.

[0059] like Figure 4 As shown, an annular cavity is provided on the side wall of the annular groove 4, and multiple layers of wire mesh 17 are fixedly installed in the annular cavity. A friction sleeve 18 is fixedly embedded on the outer wall of the circular plate 5, and a heat-conducting rod 19 extending into the through hole 14 is fixedly installed on the side wall of the friction sleeve 18.

[0060] During the movement of the annular plate 5, the annular plate 5 causes relative displacement between the friction sleeve 18 and the wire mesh 17. At this time, the friction sleeve 18 and the wire mesh 17 rub against each other, and the heat generated during the friction process is transferred to the through hole 14 through the heat conduction rod 19.

[0061] When the lubricating oil flows through the through hole 14, it can heat the lubricating oil, increase the fluidity of the lubricating oil, and play a role in ensuring that the lubricating oil adhering to the surface of the die 2 can be evenly distributed.

[0062] like Figure 4 As shown, the suction cup 9 includes a rubber ring sleeve 901 and an annular guide groove 902. The guide groove 902 is formed on the top wall of the ring sleeve 901, and the bottom end of the second corrugated tube 16 extends to the inner bottom wall of the guide groove 902.

[0063] By setting the annular guide groove 902, the suction cup 9 can apply suction force evenly to the bottom wall of the board, which can ensure that the board can be fixed stably.

[0064] like Figure 6 As shown, the second corrugated pipe 16 is provided with a spiral steel wire 20.

[0065] When a negative pressure is formed inside the first and second corrugated pipes 16, the external atmospheric pressure will evenly compress the pipe wall from all sides. The rigidity of the spiral steel wire 20 is much higher than that of the rubber pipe wall used to make the second corrugated pipe 16, which can disperse the external pressure and prevent the pipe wall from collapsing inward, thus ensuring that the gas can flow normally.

[0066] like Figure 3 As shown, an installation groove is provided on the top wall of the workbench 1, and the die 2 is detachably installed in the installation groove. Insertion holes 21 are evenly and vertically provided on the inner bottom wall of the installation groove, and insertion rods 22 corresponding to the insertion holes 21 are evenly and fixedly installed on the bottom wall of the die 2.

[0067] The die 2 is confined within the insertion hole 21 by the insert rod 22, thus preventing the die 2 from moving when the punch 3 applies pressure to the sheet metal, ensuring machining accuracy. A magnet 23 is fixedly installed on the bottom wall of the insertion hole 21, and the insert rod 22 is made of magnetic material. The insert rod 22 and the magnet 23 attract each other, thus preventing the die 2 from losing contact with the mounting groove when the workpiece is demolded, enabling continuous processing and improving work efficiency.

[0068] Meanwhile, with the cooperation of the insertion hole 21 and the insertion rod 22, the damaged die 2 can be replaced in time, further improving the machining accuracy.

[0069] like Figure 3As shown, a flow guide cavity 24 is provided on the worktable 1, and each insertion hole 21 is connected to the flow guide cavity 24. A third corrugated pipe 25 is inserted into the side wall of the second corrugated pipe 16. The end of the third corrugated pipe 25 away from the second corrugated pipe 16 extends into the flow guide cavity 24. Therefore, during the stamping and stretching process, the insertion hole 21 can be kept in a negative pressure state, thereby improving the fixing effect of the die 2. Furthermore, when the stamping is completed and the die is demolded, the insertion hole 21 is kept in a negative pressure state during the upward movement of the punch 3, thereby improving the fixing effect of the die 2 during the demolding process, preventing the die 2 from moving upward with the workpiece, thereby reducing the number of insertion and removal times of the die 2, and ensuring that there is sufficient friction between the die 2 and the side wall of the mounting groove to fix the die 2.

[0070] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A multi-station continuous metal sheet stamping and stretching forming equipment, comprising a worktable (1), wherein the worktable (1) is provided with a plurality of mutually cooperating dies (2) and punches (3). characterized in that The worktable (1) is provided with a transfer mechanism for driving the punch (3) and the die (2) to close; The die (2) is evenly arranged on the top wall of the worktable (1); The workbench (1) is evenly provided with annular grooves (4), which are filled with lubricating oil. The annular grooves (4) correspond one-to-one with the die (2), and the annular grooves (4) cover the outside of the die (2). A circular plate (5) is slidably installed in the annular groove (4). An annular cavity (6) is opened on the circular plate (5). An annular hole (7) communicating with the outside is opened on the side wall of the cavity (6). An oil spraying mechanism is provided on the worktable (1) to discharge the lubricating oil in the annular groove (4) through the annular hole (7). The top wall of the annular plate (5) is provided with a groove (8), and a suction cup (9) with an upward opening is fixedly installed in the groove (8). The workbench (1) is provided with a negative pressure mechanism for making the suction cup (9) a negative pressure state. The oil spraying mechanism includes a first elastic bellows (12) fixedly installed between the bottom wall of the annular groove (4) and the bottom wall of the circular plate (5). The first elastic bellows (12) has openings at both ends. Holes (13) are provided on the side wall of the first elastic bellows (12). The holes (13) are located below the lubricating oil level in the annular groove (4). A through hole (14) is provided on the bottom wall of the cavity (6). The bottom end of the through hole (14) is connected to the top end of the first elastic bellows (12). The negative pressure mechanism includes an airbag (15) fixedly installed between the top wall of the punch (3) and the bracket (10). A second corrugated pipe (16) is fixedly installed on the output end of the airbag (15), and the second corrugated pipe (16) extends to the bottom wall of the suction cup (9) at the end away from the airbag (15). A storage groove penetrating the top wall of the worktable (1) is opened on the side wall of the annular groove (4), and the storage groove cooperates with the second corrugated pipe (16). An annular cavity is provided on the side wall of the annular groove (4), and a multi-layer wire mesh (17) is fixedly installed in the annular cavity. A friction sleeve (18) is fixedly embedded on the outer wall of the circular plate (5), and a heat-conducting rod (19) extending into the through hole (14) is fixedly installed on the side wall of the friction sleeve (18). The workbench (1) has an installation groove on its top wall. The die (2) is detachably installed in the installation groove. The bottom wall of the installation groove has evenly vertically arranged insertion holes (21). The bottom wall of the die (2) has evenly fixed insertion rods (22) that correspond one-to-one with the insertion holes (21).

2. A multi-station continuous sheet metal press-tension forming apparatus according to claim 1, characterized by: The transfer mechanism includes a bracket (10) fixedly installed on the top wall of the workbench (1), and a hydraulic cylinder (11) with an output end corresponding to the die (2) is vertically fixedly installed on the bracket (10). The punch (3) is fixedly installed on the output end of the hydraulic cylinder (11).

3. A multi-station continuous sheet metal press-tension forming apparatus according to claim 2, characterized in that: The suction cup (9) includes a rubber ring sleeve (901) and an annular guide groove (902). The guide groove (902) is opened on the top wall of the ring sleeve (901), and the bottom end of the second corrugated pipe (16) extends to the inner bottom wall of the guide groove (902).

4. A multi-station continuous sheet metal press and draw forming apparatus as defined in claim 3 wherein: A magnet (23) is fixedly installed on the bottom wall of the socket (21), the plug rod (22) is made of magnetic material, and the plug rod (22) and the magnet (23) attract each other.

5. A multi-station continuous sheet metal press-tension forming apparatus according to claim 4, characterized in that: The workbench (1) is provided with a flow guide cavity (24), and each of the insertion holes (21) is connected to the flow guide cavity (24). A third corrugated pipe (25) is inserted into the side wall of the second corrugated pipe (16), and the end of the third corrugated pipe (25) away from the second corrugated pipe (16) extends into the flow guide cavity (24).

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