Automatic positioning device for stamping precision sheet metal parts

Abstract

The invention relates to the technical field of stamping machining of sheet metal parts, in particular to an automatic positioning device for stamping machining of precise sheet metal parts, which comprises a rack and a driving plate movably arranged on the rack, and further comprises a positioning mechanism arranged on the rack and located below the driving plate, the driving plate is hydraulically driven and can ascend and descend in the vertical direction, and the positioning mechanism is arranged on the rack and located below the driving plate. A first positioning piece is fixedly mounted at the bottom of the driving plate, and when the driving plate drives the first positioning piece to descend, the first positioning piece can be matched with the positioning mechanism, so that the workpiece is punched to be in a circular tube shape; the round pipe transferring mechanism and the feeding mechanism are installed on the two sides of the rack correspondingly and are triggered in sequence after the first positioning piece is separated from the formed round pipe; by means of a mechanical interlocking mode, workpiece positioning, finished product transferring and workpiece supplementing functions are linked, the machining efficiency can be effectively improved, manual operation is reduced, the yield can be greatly improved, and the device is suitable for application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of sheet metal stamping processing, and specifically, to an automatic positioning device for precision sheet metal stamping processing. Background Art

[0002] Sheet metal parts have the characteristics of light weight, high strength, electrical conductivity (can be used for electromagnetic shielding), low cost, good mass production performance, etc. With the increasingly wide application of sheet metal, the design of sheet metal parts has become a very important part in the product development process. Mechanical engineers must master the design skills of sheet metal parts proficiently. During the processing of sheet metal parts, they need to be stamped by a stamping machine to make the designed sheet metal meet the requirements of product functions and appearances.

[0003] Nowadays, when performing stamping work, most molds adopt a fixed design. Whenever the workpiece stamping is completed, the formed sheet metal part remains in the mold. At this time, it is necessary to transfer the formed sheet metal part in order to carry out the next round of processing. This transfer operation is generally manually taken by on-site staff, or the staff starts the corresponding control switch, and a cylinder or other driving parts are used to transfer the formed sheet metal part in the mold out of the mold. However, this transfer process usually involves multiple actions. Specifically, usually, the formed sheet metal part needs to be lifted out of the mold first before the next peeling action can be carried out. The entire demolding process is relatively cumbersome. Moreover, setting a lifting part in the mold will affect the flatness of the contact surface between the mold and the workpiece, and it is easy to cause uneven stress at the corresponding position of the stamped sheet metal part, which may further lead to unqualified dimensions of the formed sheet metal part. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic positioning device for precision sheet metal stamping processing to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An automatic positioning device for precision sheet metal stamping processing, including a frame and a driving plate movably arranged on the frame, and further including: A positioning mechanism, arranged on the frame and located below the driving plate. The driving plate is hydraulically driven and can move up and down in the vertical direction. A first positioning part is fixedly installed at the bottom of the driving plate. When the driving plate drives the first positioning part to descend, the first positioning part can cooperate with the positioning mechanism to make the workpiece be stamped into a circular tube shape; The round tube transfer mechanism and the feeding mechanism are respectively installed on both sides of the frame, and the two are triggered in sequence after the round tube on the first positioning member is separated from the formed round tube. The round tube transfer mechanism can perform a separating action on the round tube located on the positioning mechanism, and the feeding mechanism can convey the workpiece to be stamped between the first positioning member and the positioning mechanism.

[0006] As a further solution of the present invention: The positioning mechanism includes a second positioning member fixedly installed on the frame and a rod movably arranged on the frame. The rod is located between the first positioning member and the second positioning member. A guiding positioning member is also fixedly installed on one side of the frame facing the feeding mechanism. The feeding mechanism can cause the workpiece to move through the guiding positioning member to between the first positioning member and the rod. A vertical plate is fixedly installed on the frame, and a sliding plate is slidably arranged on the vertical plate. The sliding plate is connected to an elastic telescopic rod installed on the frame, and the rod is fixed to the sliding plate.

[0007] As a further solution of the present invention: The bottom of the first positioning member is provided with a first arc-shaped notch, the upper part of the second positioning member is provided with a second arc-shaped notch, and inclined surfaces are formed on both sides of the second arc-shaped notch. A cutting knife is also fixedly installed at the bottom of the first positioning member, and the cutting knife is used to perform a cutting action on the plate during the stamping process.

[0008] As a further solution of the present invention: The round tube transfer mechanism includes a driven structure arranged on the side of the frame and a circumferential rotation assembly cooperating with the driven structure. The circumferential rotation assembly includes a cam rotatably installed on the side of the frame and a convex column fixedly arranged on the cam. The rotation shaft of the cam is connected with a one-way transmission structure, and the one-way transmission structure is also connected to the feeding mechanism.

[0009] As a further solution of the present invention: The driven structure includes a cross bar fixed to the side of the frame, a transverse moving rod slidably arranged on the cross bar, and a material pushing rod fixedly connected to the transverse moving rod. One end of the material pushing rod away from the transverse moving rod is arc-shaped and is located above the rod. A strip-shaped through groove adapted to the convex column is arranged on the transverse moving rod, and the convex column penetrates through the strip-shaped through groove and is slidably connected to the transverse moving rod.

[0010] As a further solution of the present invention: Two guiding plates are fixedly installed on one side of the frame facing the guiding positioning member. Two guiding grooves are respectively arranged on the two guiding plates. A slider is slidably fitted in each of the two guiding grooves on the guiding plate. The feeding mechanism includes a round roller rotatably installed between two opposite sliders; A double-headed cylinder is installed on the side of one of the guide plates. The two ends of the double-headed cylinder are respectively fixed to the two sliders. The rotating shafts of the two round rollers are connected to the one-way transmission structure through a sliding sleeve assembly.

[0011] As a further scheme of the present invention: The sliding sleeve assembly includes a rotating shaft rotatably installed on the side of the frame and two sleeves slidably sleeved on the rotating shaft through a limiting structure. The two sleeves are respectively rotatably connected to the two sliders, and the sleeves are connected to the rotating shaft of the round roller through a second bevel gear set.

[0012] As a further scheme of the present invention: The limiting structure includes two strip-shaped protruding parts formed on the outer wall of the rotating shaft and two strip-shaped grooves formed on the inner wall of the sleeve. The strip-shaped grooves are adapted to the strip-shaped protruding parts, and both are parallel to the central axis of the rotating shaft.

[0013] As a further scheme of the present invention: The one-way transmission structure includes a first driven shaft and a second driven shaft rotatably installed on the frame, and a first ratchet and a second ratchet respectively fixed on the first driven shaft and the second driven shaft; Wherein, a ratchet plate cooperating with the first ratchet and the second ratchet is fixed on the driving plate member. The first driven shaft is connected to the rotating shaft of the cam through a transmission belt, and the second driven shaft is connected to the rotating shaft through a first bevel gear set.

[0014] Compared with the prior art, the beneficial effects of the present invention are: During operation, through the cooperation between the first positioning member and the positioning mechanism, the first positioning member presses down, so that the workpiece is formed between the first positioning member and the positioning mechanism. In the positioning mechanism, the rod body acts as a part of the mold, and the rod body is movably arranged through an elastic telescopic rod. After the first positioning member is lifted, the elastic telescopic rod can drive the rod body to rebound and drive the formed sheet metal part to automatically lift. There is no need to set other driving components to lift the formed sheet metal part, thus effectively simplifying the demolding process. At the same time, it also avoids the problem that the flatness of the contact between the workpiece and the mold is not good due to the setting of a lifting member in the mold, resulting in the unqualified size of the formed sheet metal part; Secondly, after the rod body drives the formed sheet metal part to lift, the lifting action of the first positioning member can trigger the round tube transfer mechanism. The round tube transfer mechanism can automatically move circumferentially along the rod body to peel off the formed sheet metal part located on the rod body, thus realizing the automation of the demolding process; In addition, after the above demolding process is completed, the first positioning member will also prompt the feeding mechanism to be triggered, and the feeding mechanism automatically replenishes the material to be processed below the first positioning member. Therefore, mechanical interlocking of the feeding, stamping, and demolding functions in sheet metal stamping can be achieved, simplifying the entire process of sheet metal stamping. Brief Description of the Drawings

[0015] Figure 1 Isometric view of an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0016] Figure 2 Structural schematic diagram of an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0017] Figure 3 Structural schematic diagram of another angle of an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0018] Figure 4 Structural schematic diagram of yet another angle of an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0019] Figure 5 Is Figure 3 Enlarged structural view of part A in

[0020] Figure 6 Structural schematic diagram of the feeding mechanism in an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0021] Figure 7 Structural schematic diagram of the circular tube transfer mechanism in an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0022] Figure 8 Structural schematic diagram of the positioning mechanism in an embodiment of an automatic positioning device for precision sheet metal stamping processing.

[0023] In the figure: 1, frame; 2, first positioning member; 201, first arc-shaped notch; 3, second positioning member; 301, inclined surface; 302, second arc-shaped notch; 4, rod body; 5, vertical plate; 6, sliding plate; 7, elastic telescopic rod; 8, driving plate member; 9, cutting tool; 10, guiding and positioning member; 11, first driven shaft; 12, second driven shaft; 13, ratchet plate; 14, first ratchet wheel; 15, second ratchet wheel; 16, transmission belt; 17, first bevel gear set; 18, guiding plate; 19, slider; 20, round roller; 21, rotating shaft; 22, sleeve; 23, second bevel gear set; 24, double-headed cylinder; 25, cam; 2501, convex column; 26, material pushing rod; 27, cross bar; 28, transverse moving rod; 2801, strip-shaped through slot. Detailed Description of the Embodiment

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In addition, the elements in the present invention are referred to as "fixed to" or "disposed on" another element, which can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0026] Please refer to Figures 1 - 8 , in the embodiment of the present invention, an automatic positioning device for precision sheet metal stamping processing includes a frame 1 and a driving plate 8 movably disposed on the frame 1, and further includes: A positioning mechanism is disposed on the frame 1 and is located below the driving plate 8. The driving plate 8 is hydraulically driven and can move up and down in the vertical direction. A first positioning member 2 is fixedly installed at the bottom of the driving plate 8. When the driving plate 8 drives the first positioning member 2 to descend, the first positioning member 2 can cooperate with the positioning mechanism to stamp the workpiece into a circular tube shape; A circular tube transfer mechanism and a feeding mechanism are respectively installed on both sides of the frame 1, and the two are triggered in sequence after the first positioning member 2 is separated from the formed circular tube. The circular tube transfer mechanism can perform a separating action on the circular tube located on the positioning mechanism, and the feeding mechanism can convey the workpiece to be stamped between the first positioning member 2 and the positioning mechanism.

[0027] Furthermore, during actual processing, the workpiece to be stamped is located between the first positioning member 2 and the positioning mechanism. The driving plate 8 is driven by hydraulic pressure to descend. Then, under the combined action of the first positioning member 2 and the positioning mechanism, the workpiece is stamped into a circular tube. Subsequently, the hydraulic pressure drives the driving plate 8 to rise and reset. During the process of the driving plate 8 continuing to rise after being separated from the circular tube, the circular tube transfer mechanism and the feeding mechanism are triggered in sequence. The circular tube transfer mechanism first performs a separating action on the formed circular tube, causing the circular tube to be separated from the positioning mechanism. Immediately afterwards, the feeding mechanism conveys the workpiece to be stamped under the first positioning member 2; In summary, through the mutual cooperation between various mechanisms and components, during processing, through the cooperation between the first positioning member 2 and the positioning mechanism, the stamping forming of the workpiece is achieved. After the workpiece is formed, the circular tube transfer mechanism and the feeding mechanism can be triggered in sequence, thereby realizing the automatic separation function of the pipe fitting and the effect of automatically supplementing the workpiece to be processed below the first positioning member 2. In this way, through the mechanical interlocking method, the functions of workpiece positioning, finished product transfer, and workpiece supplement are linked, which can effectively improve the processing efficiency, reduce manual operation, greatly increase the output, and is suitable for popularization and use.

[0028] Please refer to again Figure 4 and Figure 8 , the positioning mechanism includes a second positioning member 3 fixedly installed on the frame 1 and a rod body 4 movably arranged on the frame 1. The rod body 4 is located between the first positioning member 2 and the second positioning member 3. A guiding positioning member 10 is also fixedly installed on one side of the frame 1 facing the feeding mechanism. The feeding mechanism can cause the workpiece to move through the guiding positioning member 10 to between the first positioning member 2 and the rod body 4. A vertical plate 5 is fixedly installed on the frame 1, and a sliding plate 6 is slidably arranged on the vertical plate 5. The sliding plate 6 is connected to an elastic telescopic rod 7 installed on the frame 1. The rod body 4 is fixed to the sliding plate 6. A first arc-shaped notch 201 is provided at the bottom of the first positioning member 2, and a second arc-shaped notch 302 is provided at the upper part of the second positioning member 3. And inclined surfaces 301 are formed on both sides of the second arc-shaped notch 302. A cutting knife 9 is also fixedly installed at the bottom of the first positioning member 2. The cutting knife 9 is used to perform a cutting action on the plate during stamping.

[0029] When the present application is specifically implemented, the workpiece to be processed does not need to be cut. The staff needs to pass the workpiece to be processed through the guiding positioning member 10 and extend it between the first positioning member 2 and the rod body 4. During the process of the hydraulic drive causing the driving plate 8 to descend, the cutting knife 9 will cut the workpiece. After the first positioning member 2 acts on the rod body 4, it causes the rod body 4 to descend, so that the elasticity inside the elastic telescopic rod 7 is compressed. Subsequently, both sides of the workpiece will respectively contact the two inclined surfaces 301. Then, the rod body 4 enters the second arc-shaped notch 302, causing both sides of the workpiece to bend, so that the workpiece forms a circular tube sleeved on the outer circumference of the rod body 4.

[0030] Please refer to again Figure 2 and Figure 7, the circular tube transfer mechanism includes a driven structure provided on the side of the frame 1 and a circumferential rotation assembly that cooperates with the driven structure. The circumferential rotation assembly includes a cam 25 rotatably mounted on the side of the frame 1 and a convex column 2501 fixedly provided on the cam 25. The rotation shaft of the cam 25 is connected to a one-way transmission structure, and the one-way transmission structure is also connected to the feeding mechanism. The driven structure includes a cross bar 27 fixed to the side of the frame 1, a crosswise moving rod 28 slidably provided on the cross bar 27, and a material pushing rod 26 fixedly connected to the crosswise moving rod 28. One end of the material pushing rod 26 away from the crosswise moving rod 28 is arc-shaped and is located above the rod body 4. A strip-shaped through groove 2801 adapted to the convex column 2501 is provided on the crosswise moving rod 28, and the convex column 2501 passes through the strip-shaped through groove 2801 and is slidably connected to the crosswise moving rod 28.

[0031] During the upward movement of the first positioning member 2, the spring in the elastic telescopic rod 7 will rebound, so that the rod body 4 and the circular tube sleeved on the rod body 4 will rise. After the spring in the elastic telescopic rod 7 finishes rebounding, that is, after the first positioning member 2 is separated from the circular tube, the one-way transmission structure is triggered. The one-way transmission structure first drives the cam 25 to rotate one week. Correspondingly, the convex column 2501 completes a circular motion, and through the sliding fit between the strip-shaped through groove 2801 and the crosswise moving rod 28, the crosswise moving rod 28 is urged to complete a reciprocating slide on the cross bar 27, and the material pushing rod 26 completes a reciprocating movement along the axial direction of the rod body 4, so that the circular tube sleeved on the rod body 4 can be pushed away. Subsequently, the one-way transmission structure drives the feeding mechanism to move, and the feeding mechanism conveys the workpiece to be stamped and processed between the first positioning member 2 and the rod body 4 to realize the continuity of processing.

[0032] Please refer to again Figure 1 , Figure 5 and Figure 6 , two guide plates 18 are fixed on one side of the frame 1 facing the guiding and positioning member 10. Two guide grooves are respectively provided on the two guide plates 18. A slider 19 is slidably fitted in each of the two guide grooves on the guide plate 18. The feeding mechanism includes a circular roller 20 rotatably mounted between two opposite sliders 19. A double-headed cylinder 24 is installed on the side of one of the guide plates 18. The two ends of the double-headed cylinder 24 are respectively fixed to the two sliders 19. The rotation shafts of the two circular rollers 20 are connected to the one-way transmission structure through a sliding fit assembly.

[0033] The sliding and sleeving assembly includes a rotating shaft 21 rotatably mounted on the side of the frame 1 and two sleeves 22 slidably sleeved on the rotating shaft 21 through a limiting structure. The two sleeves 22 are respectively rotatably connected to the two sliders 19, and the sleeve 22 is connected to the rotating shaft of the round roller 20 through a second bevel gear set 23. The limiting structure includes two strip-shaped protruding portions formed on the outer wall of the rotating shaft 21 and two strip-shaped grooves provided on the inner wall of the sleeve 22. The strip-shaped grooves are adapted to the strip-shaped protruding portions, and both are parallel to the central axis of the rotating shaft 21.

[0034] Before the processing starts, control the double-headed cylinder 24 to drive the two sliders 19 to slide closer to each other until the two round rollers 20 clamp the workpiece. During this process, the two sleeves 22 slide closer to each other on the rotating shaft 21. When the subsequent one-way transmission structure drives the rotating shaft 21 to rotate, the rotating shaft 21 can drive the sleeve 22 to rotate through the strip-shaped protruding portion and the strip-shaped groove. The sleeve 22 can drive the round roller 20 to rotate through the second bevel gear set 23, so that the workpiece located between the two round rollers 20 is conveyed between the first positioning member 2 and the rod body 4 through the guiding and positioning member 10.

[0035] Specifically, the second bevel gear set 23 includes a third bevel gear fixedly installed on the sleeve 22 and a fourth bevel gear fixedly installed on the rotating shaft of the round roller 20, and the fourth bevel gear meshes with the third bevel gear.

[0036] The one-way transmission structure includes a first driven shaft 11 and a second driven shaft 12 rotatably mounted on the frame 1, and a first ratchet 14 and a second ratchet 15 respectively fixed on the first driven shaft 11 and the second driven shaft 12; Among them, a ratchet plate 13 cooperating with the first ratchet 14 and the second ratchet 15 is fixed on the driving plate member 8. The first driven shaft 11 is connected to the rotating shaft of the cam 25 through a transmission belt 16, and the second driven shaft 12 is connected to the rotating shaft 21 through a first bevel gear set 17.

[0037] It should be noted that the first bevel gear set 17 includes a first bevel gear fixedly installed at one end of the second driven shaft 12 close to the rotating shaft 21 and a second bevel gear fixedly installed at the top of the rotating shaft 21. The second bevel gear meshes with the first bevel gear; During the process of the driving plate 8 descending under hydraulic drive, the ratchet plate 13 will sequentially pass by the second ratchet wheel 15 and the first ratchet wheel 14. At this time, the second ratchet wheel 15 and the first ratchet wheel 14 do not rotate. However, during the ascending process of the driving plate 8, and after the first positioning member 2 is separated from the circular tube sleeved on the rod body 4, the ratchet plate 13 will sequentially pass by the first ratchet wheel 14 and the second ratchet wheel 15. At this time, the first ratchet wheel 14 and the second ratchet wheel 15 will sequentially cooperate with the ratchets on the ratchet plate 13 and rotate sequentially. The first ratchet wheel 14 rotates, and the first driven shaft 11 drives the cam 25 to rotate one week through the transmission belt 16, so that the material pushing rod 26 completes a reciprocating motion along the axial direction of the rod body 4 to separate the circular tube on the rod body 4. The second ratchet wheel 15 rotates, and the second driven shaft 12 drives the rotating shaft 21 to rotate through the first bevel gear set 17, so that the two circular rollers 20 rotate synchronously but in different directions to convey the workpiece through the guiding and positioning member 10 between the first positioning member 2 and the rod body 4.

[0038] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0039] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic positioning device for precision sheet metal stamping, comprising a frame and a driving plate movably arranged on the frame; It is characterized in that Also includes: A positioning mechanism is provided on the frame and is located below the driving plate. The driving plate is driven by hydraulic pressure and can be lifted and lowered in the vertical direction. A first positioning member is fixedly installed at the bottom of the driving plate. When the driving plate drives the first positioning member to descend, the first positioning member can cooperate with the positioning mechanism to punch the workpiece into a round tube shape. The round tube transfer mechanism and the feeding mechanism are respectively installed on both sides of the frame. The two are triggered in sequence after the first positioning member is separated from the formed round tube. The round tube transfer mechanism can perform a pulling action on the round tube located on the positioning mechanism, and the feeding mechanism can transport the workpiece to be stamped between the first positioning member and the positioning mechanism.

2. The automatic positioning device for precision sheet metal stamping according to claim 1, characterized in that: The positioning mechanism includes a second positioning member fixedly mounted on the frame and a rod body movably mounted on the frame, the rod body being located between the first positioning member and the second positioning member, a guide positioning member being also fixed to the side of the frame facing the feeding mechanism, the feeding mechanism being capable of causing the workpiece to pass through the guide positioning member and move between the first positioning member and the rod body, a vertical plate being fixed to the frame, a sliding plate being slidably mounted on the vertical plate, the sliding plate being connected to an elastic telescopic rod mounted on the frame, and the rod body being fixed to the sliding plate.

3. The automatic positioning device for precision sheet metal stamping according to claim 2, characterized in that: A first arc-shaped recess is provided at the bottom of the first positioning member, a second arc-shaped recess is provided at the upper portion of the second positioning member, and inclined surfaces are formed on both sides of the second arc-shaped recess. A cutter is also fixedly installed at the bottom of the first positioning member, and the cutter is used to cut the plate during the stamping process.

4. The automatic positioning device for precision sheet metal stamping according to claim 2, characterized in that: The round tube transfer mechanism includes a driven structure arranged on the side of the frame and a circumferential rotating component cooperating with the driven structure, the circumferential rotating component includes a cam rotatably mounted on the side of the frame and a convex column fixed on the cam, and the rotating shaft of the cam is connected to a one-way transmission structure, and the one-way transmission structure is also connected to the feeding mechanism.

5. The automatic positioning device for precision sheet metal stamping according to claim 4, characterized in that: The driven structure includes a cross bar fixed to the side of the frame, a transverse rod slidably arranged on the cross bar, and a material shifting rod fixedly connected to the transverse rod. The end of the material shifting rod away from the transverse rod is arc-shaped and located above the rod body. The transverse rod is provided with a strip through groove adapted to the boss. The boss passes through the strip through groove and is slidably connected to the transverse rod.

6. The automatic positioning device for precision sheet metal stamping according to claim 4, characterized in that: Two guide plates are fixed on one side of the frame facing the guide positioning member, and two guide grooves are respectively provided on the two guide plates, and a slider is slidably engaged in the two guide grooves on the guide plates, and the feeding mechanism includes a round roller rotatably mounted between two opposite sliders; A double-headed cylinder is installed on the side of one of the guide plates, and both ends of the double-headed cylinder are respectively fixed to the two sliding blocks, and the rotating shafts of the two round rollers are connected to the one-way transmission structure through a sliding sleeve assembly.

7. The automatic positioning device for precision sheet metal stamping according to claim 6, characterized in that: The sliding sleeve assembly includes a rotating shaft rotatably mounted on the side of the frame and two sleeves slidably sleeved on the rotating shaft through a limiting structure. The two sleeves are respectively rotatably connected to the two sliders, and the sleeves are connected to the rotating shaft of the round roller through a second bevel gear set.

8. The automatic positioning device for precision sheet metal stamping according to claim 7, characterized in that: The limiting structure includes two strip-shaped protrusions formed on the outer wall of the rotating shaft and two strip-shaped grooves arranged on the inner wall of the sleeve. The strip-shaped grooves are adapted to the strip-shaped protrusions, and both are parallel to the central axis of the rotating shaft.

9. The automatic positioning device for precision sheet metal stamping according to claim 7, characterized in that: The one-way transmission structure comprises a first driven shaft and a second driven shaft rotatably mounted on the frame, and a first ratchet wheel and a second ratchet wheel respectively fixed on the first driven shaft and the second driven shaft; Among them, a ratchet plate cooperating with the first ratchet and the second ratchet is fixed on the driving plate, the first driven shaft is connected to the rotating shaft of the cam through a transmission belt, and the second driven shaft is connected to the rotating shaft through a first bevel gear set.

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