Ring-shaped parts shaping device

Abstract

A circular ring-shaped part shaping device comprises a base plate and a lower die seat fixedly arranged on the base plate, and is characterized in that it also comprises an inner slider arranged in the lower die seat and an inner slider shovel base in the shape of a truncated cone, the inner slider shovel base is fixedly connected to the base plate; a plurality of shovel base guides and a corresponding number of inner sliders are arranged on the outer periphery of the inner slider shovel base, and the inner slider reciprocates in the lower die seat under the guidance of the shovel base guides; an inner slider reset mechanism is arranged on the lower die seat; an inwardly concave step-shaped shaping working surface is arranged on the inner side of the top of the inner slider, the step-shaped shaping working surface comprises a vertical surface and a workpiece bearing surface, the spacing between the inner and outer arcs of the workpiece bearing surface is slightly larger than the spacing between the inner and outer circumferences of the circular ring-shaped part; the height of the vertical surface is lower than the thickness of the circular ring-shaped part; the vertical surfaces of the step-shaped shaping working surfaces on all the inner sliders are in a circular ring shape after being spliced; a radially protruding limit hanging platform extending to the bottom of the inner side of the inner slider is arranged at the bottom of the inner side of the inner slider.

Description

Technical Field

[0001] The present application relates to the field of metal powder forming, and in particular to a ring-shaped parts shaping device. Background Art

[0002] Metal Powder Injection Molding (MIM) is a new type of powder metallurgy near-net-shape forming technology formed by introducing modern plastic injection molding technology into the field of powder metallurgy. In the shaping process after the metal powder injection molding process, especially for round parts, there is often a phenomenon of out-of-roundness due to the large sintering shrinkage. Depending on the size of the product, the out-of-roundness can reach 0.5mm-1mm. The difficulty of shaping is different from that of other parts. Generally, a hydraulic press or a manual press is used in combination with a shaping mold for shaping. Products with relatively high roundness requirements have a high scrap rate and low work efficiency. Especially for round parts with a roundness of less than 0.1mm, it is difficult to achieve with existing shaping tools. In production practice, we accidentally found that the roundness of the traditional two semicircular outer slider inner extrusion structure after shaping is within the range of 0.2-0.5mm. Summary of the invention

[0003] At present, there is an urgent need for a shaping device that is simple to operate and has high working efficiency, which can correct the out-of-round phenomenon to a roundness of less than 0.1 mm and take into account the flatness of annular parts. In view of the above problems, this scheme proposes a shaping device for annular parts.

[0004] The technical solution adopted in this scheme is a circular ring-shaped part shaping device, which includes a base plate and a lower die seat fixedly arranged on the base plate, and is characterized in that it also includes an inner slider arranged in the lower die seat and an inner slider shovel base in the shape of a truncated cone, and the inner slider shovel base is fixedly connected to the base plate; a plurality of shovel base guides and a corresponding number of inner sliders are arranged on the outer periphery of the inner slider shovel base, and the inner slider reciprocates in the lower die seat under the guidance of the shovel base guides; an inner slider reset mechanism is arranged on the lower die seat; an inwardly concave step-shaped shaping working surface is arranged on the inner side of the top of the inner slider, and the step-shaped shaping working surface includes a vertical surface and a workpiece bearing surface; the vertical surfaces of the step-shaped shaping working surfaces on all the inner sliders are in a circular ring shape after being spliced; a radially protruding limit hanging platform extending to the bottom of the inner slider shovel base is arranged at the bottom of the inner side of the inner slider.

[0005] The specific features of this solution are that the radial dimension of the workpiece bearing surface is slightly larger than the distance between the inner and outer circumferences of the annular part; and the height of the vertical surface is slightly lower than the thickness of the annular part.

[0006] The shovel base guide means that a plurality of longitudinally distributed tooth-like protrusions are arranged on the outer periphery of the shovel base of the inner slider, and a shovel base guide is formed between adjacent tooth-like protrusions; the inner side surface of each inner slider is provided with a longitudinally extending slider protrusion, which is inserted into the corresponding shovel base guide and slides relative to the shovel base guide; the direction in which the inner slider moves along the shovel base guide is 3-10 degrees from the central axis of the inner slider shovel base. The angle design here should comprehensively consider the radial stroke S1 and the vertical stroke S2 ​​of the inner slider, mainly because the radial stroke S1 must be greater than the deformation of the annular part to ensure that the annular part can be correctly placed on the working bearing surface, and all the inner sliders covered on the outer side surface of the inner slider shovel base gradually shrink inwards during the process of sliding from the highest position to the lowest limit position in a slightly open state.

[0007] The inner slider is composed of eight pieces. The upper end surface of each inner slider includes the inner slider top surface, the vertical surface, the workpiece bearing surface and the slider protrusion. The top edge of the vertical surface is connected with the inner slider top surface, the bottom edge of the vertical surface is connected with the workpiece bearing surface, and the workpiece bearing surface is connected with the top of the slider protrusion.

[0008] The vertical surfaces of the stepped shaping working surfaces on all the inner sliding blocks are assembled to form a circular ring, and the roundness is 0.01mm.

[0009] The inner slider shovel base is fixedly connected to the bottom plate by an inner slider shovel base connecting sleeve, that is, the inner slider shovel base is fixedly connected to one end of the inner slider shovel base connecting sleeve, and the bottom plate is fixedly connected to the other end of the inner slider shovel base connector.

[0010] The inner slider shovel base and one end of the inner slider shovel base connecting sleeve are fixedly connected by setting an inner slider shovel base step hole that runs axially through the middle of the inner slider shovel base. The inner slider shovel base step hole is divided into three sections: the head, the neck and the tail. The inner diameters of the head and the tail are larger than the inner diameter of the neck. The head and the neck of the inner slider shovel base step hole are circular for bolt insertion. A protrusion is set on the inner side surface of the tail of the inner slider shovel base step hole. The upper outer edge of the inner slider shovel base connecting sleeve is recessed to form an upper anti-rotation surface that cooperates with the protrusion at the tail of the inner slider shovel base step hole. The upper part of the inner slider shovel base connecting sleeve is inserted into the tail of the inner slider shovel base step hole and is circumferentially limited. The bolt is inserted from the head and the neck and is threadedly connected to the inner slider shovel base connecting sleeve, so that the inner slider shovel base and the inner slider shovel base connecting sleeve are fixedly connected together.

[0011] The fixed connection between the bottom plate and the other end of the inner slider shovel base means that a bottom plate step hole is arranged vertically through the bottom plate, and the bottom plate step hole is divided into three sections: head, neck and tail, and the inner diameters of the head and tail are larger than the inner diameter of the neck; the tail and neck of the bottom plate step hole are circular for bolts to be inserted, and a protrusion is provided on the inner side surface of the head of the bottom plate step hole, and the lower outer edge portion of the inner slider shovel base connecting sleeve is recessed to form a lower anti-rotation surface cooperating with the protrusion of the head of the bottom plate step hole, the lower part of the inner slider shovel base connecting sleeve is inserted into the head of the bottom plate step hole and circumferentially limited, and the bolts are inserted from the bottom surface of the bottom plate and threadedly connected to the inner slider shovel base connecting sleeve, so that the bottom plate and the inner slider shovel base connecting sleeve are fixedly connected together.

[0012] The head of the bottom plate step hole and the inner slider shovel base connecting sleeve have a clearance of less than 0.01mm, and the tail of the inner slider shovel base step hole and the inner slider shovel base connecting sleeve have a clearance of less than 0.01mm, so that the central axis of the inner slider shovel base is perpendicular to the lower die base.

[0013] An inverted conical circular hole is set on the upper part of the lower die seat, and the inner slider and the inner slider shovel base are inserted into the inverted conical circular hole. The generatrix on the side of the inverted conical circular hole forms an angle of 3-10 degrees with the vertical. The matching clearance of the inverted conical circular hole, the inner slider and the inner slider shovel base is within 0.01mm.

[0014] The inner slider reset mechanism includes a cylindrical hole arranged at the lower part of the lower die seat, the contour of the cylindrical hole is larger than the lower end opening of the inverted cone circular hole, a pad is arranged in the cylindrical hole, the pad is installed in the cylindrical hole of the lower die plate and moves up and down in the cylindrical hole; a pad circular through hole for accommodating the inner slider shovel base connecting sleeve 8 is arranged on the pad, and the inner slider shovel base connecting sleeve and the pad circular through hole are clearance-matched. A plurality of reset springs are fixedly arranged at the bottom of the pad, and the reset springs are located between the pad and the bottom plate. After the hydraulic press is reset, the pad pushes out the inner slider under the action of the reset spring, and the inner slider rises and radially loosens the annular part. The stroke S2 ​​of the pad 9 is equal to the height of the cylindrical hole minus the thickness of the pad 9, and S2=S1 / tan A, where S1 is the radial stroke of the slider, which is 0.2-3mm.

[0015] The backing plate is a quadrangular prism or a polygonal prism, and the shape of the cylindrical hole is consistent with that of the backing plate.

[0016] An upper template is arranged above the lower die seat, a guide column is fixedly arranged on the upper template, and a guide sleeve is arranged on the lower die seat. The guide column is inserted into the guide sleeve to make the upper template move up and down relative to the lower die seat. The upper template is fixedly installed on the hydraulic press through the panel, and the circular part is placed on the workpiece bearing surface of the step-shaped shaping working surface. The panel and the bottom plate are respectively squeezed on the upper template and the annular parts on the lower die seat under the guidance of the guide column and the guide sleeve. The upper template squeezes the annular parts and drives the inner slider at the same time. During the downward movement of the inner slider along the inner slider shovel base and the inverted cone circular hole of the lower die seat, the annular part is subjected to the pressure of the upper template so that the inner slider descends along the inner slider shovel base. During the vertical surface of the step-shaped shaping working surface, the annular part is radially forced from the outside to the inside to complete the roundness shaping of the annular part. When the inner slider continues to move to the bottom dead point of the stroke, the workpiece bearing surface of the upper template and the inner slider applies force up and down to the annular part to complete the flatness shaping of the annular part, and corrects the deformation caused by the inner slider squeezing the annular part. Here, when the upper mold plate reaches the bottom dead center, it presses the annular part but does not touch the top surface of the slider. The top surface of the slider should be 0.03-0.05mm lower. After shaping, the hydraulic press is reset, the upper mold plate moves up, and the pad is evenly pushed out of the inner slider under the action of the reset spring and releases the annular part.

[0017] The beneficial effects of this solution are: 1. The roundness of the stepped shaping working surface of the inner slider of this device is 0.01-0.03mm. Under the guidance of the inner slider shovel base, the stepped shaping working surface of the inner slider evenly and stably extrude the annular parts, so that the roundness of the annular parts after shaping is less than 0.1mm. The overall structure is compact and accurately solves the problem of out-of-roundness. 2. In this device, the inner slider shovel base guides the inner slider, and the inverted tapered circular hole allows the inner slider to extrude the annular parts. The upper and lower templates will not deviate due to the guiding effect of the guide pins and guide sleeves when they are extruded. Since the roundness of the stepped shaping working surface is 0.01-0.03mm, the roundness after correction is less than 0.1mm, and the upper template interacts with the stepped shaping working surface and plays a role in shaping the flatness of the annular parts. After shaping, the flatness of the annular parts can be guaranteed to be within the range of 0.05mm. 3. After correcting the out-of-round phenomenon, the product is evenly ejected by the spring, which is convenient to disassemble and remove, and has high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view and a cross-sectional view of the annular part shaping device; Figure 2 This is the front view of the inner slider shovel base. Figure 3 for Figure 2 Middle AA section view. Figure 4 Schematic diagram of the inner slider structure. Figure 5 for Figure 4 Middle BB section view. Figure 6 It is a schematic diagram of the top surface structure of the inner slider shovel base connecting sleeve. Figure 7 for Figure 6Middle CC section view. Figure 8 It is a structural schematic diagram of the ring-shaped parts shaping device in the mold opening state. Fig. 9 Exploded view of the shaping device for the ring-shaped part.

[0019] In the figure: 1-shovel base of inner slider; 2-inner slider; 3-shovel base guide; 4-toothed protrusion; 5-slider protrusion; 6-bolt; 7-vertical surface; 8-workpiece bearing surface; 9-pad; 10-lower die seat; 11-upper die plate; 12-guide column; 13-guide sleeve; 14-panel; 15-bottom plate; 16-reset spring; 17-annular part; 18-shovel base connecting sleeve of inner slider; 19-inverted cone-shaped circular hole; 20-cylindrical hole; 21-bolt; 22-upper anti-rotation surface; 23-lower anti-rotation surface; 24-limit hanging table. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] Example 1: Figure 1 As shown in FIG. 4 , a circular ring-shaped part shaping device comprises a base plate 15 and a lower die seat 10 fixedly arranged on the base plate 15, and also comprises an inner slider 2 arranged in the lower die seat 10 and an inner slider shovel base 1 in the shape of a truncated cone, wherein the inner slider shovel base 1 is fixedly connected to the base plate 15; a plurality of shovel base guides 3 and a corresponding number of inner sliders 2 are arranged on the outer periphery of the inner slider shovel base 1, and the inner slider 2 reciprocates in the lower die seat 10 under the guidance of the shovel base guides 3; an inner slider reset mechanism is arranged on the lower die seat 10; an inwardly concave step-shaped shaping working surface is arranged on the inner side of the top of the inner slider 2, and the step-shaped shaping working surface comprises a vertical surface 7 and a workpiece bearing surface 8, and the spacing between the inner and outer arcs of the workpiece bearing surface 8 is slightly larger than the spacing between the inner and outer circumferences of the circular ring-shaped part 17; the height of the vertical surface 7 is slightly lower than the thickness of the circular ring-shaped part 17; the vertical surfaces 7 of the step-shaped shaping working surfaces on all the inner sliders 2 are annular after being assembled. A limiting hanging platform 24 is provided at the bottom of the inner side of the inner slider 2 , which protrudes radially and extends to the bottom of the inner slider shovel base 1 , so as to limit the inner slider 2 from escaping upward from the inner slider shovel base 1 .

[0022] The shovel base guide 3 refers to a plurality of longitudinally distributed tooth-shaped protrusions 4 arranged on the outer periphery of the inner slider shovel base 1, and a shovel base guide 3 is formed between adjacent tooth-shaped protrusions 4; the inner side surface of each inner slider 2 is provided with a longitudinally extending slider protrusion 5, which is inserted into the corresponding shovel base guide 3 and slides relative to the shovel base guide 3. The direction in which the inner slider 2 moves along the shovel base guide 3 and the central axis of the inner slider shovel base 1 is 3-10 degrees. The angle design here should comprehensively consider the radial and vertical strokes of the inner slider 2, mainly the radial stroke must be greater than the deformation of the annular part 17 to ensure that the annular part 17 can be correctly placed on the working bearing surface 8. All inner sliders 2 covered on the outer side surface of the inner slider shovel base 1 gradually shrink inwards during the process of sliding from the highest position to the lowest limit position in a slightly open state. The vertical surfaces 7 of the stepped shaping working surfaces on all inner sliders 2 are annular after being spliced, and the roundness is 0.01mm.

[0023] The inner slider 2 is composed of eight pieces. The upper end surface of each inner slider 2 includes the top surface of the inner slider, the vertical surface 7, the workpiece bearing surface 8 and the slider protrusion 5. The top edge of the vertical surface 7 is connected to the top surface of the inner slider 2, the bottom edge of the vertical surface 7 is connected to the workpiece bearing surface 8, and the workpiece bearing surface 8 is connected to the top of the slider protrusion 5.

[0024] The inner slider shovel base 1 is fixedly connected to the bottom plate 15, which means that the inner slider shovel base 1 is fixedly connected to the bottom plate 15 through the inner slider shovel base connecting sleeve 18, that is, the inner slider shovel base 1 is fixedly connected to one end of the inner slider shovel base connecting sleeve 18, and the bottom plate 15 is fixedly connected to the other end of the inner slider shovel base connector 18.

[0025] The inner slider shovel base 1 is fixedly connected to one end of the inner slider shovel base connecting sleeve 18 by setting an inner slider shovel base step hole that runs axially through the middle of the inner slider shovel base 1. The inner slider shovel base step hole is divided into three sections: the head, the neck and the tail. The inner diameter of the head and the tail is larger than the inner diameter of the neck. The head and the neck of the inner slider shovel base step hole are circular for the bolt 6 to be inserted. A protrusion is set on the inner side surface of the tail of the inner slider shovel base step hole. The upper outer edge of the inner slider shovel base connecting sleeve 18 is recessed to form an upper stop surface 22 that cooperates with the protrusion at the tail of the inner slider shovel base step hole. The upper part of the inner slider shovel base connecting sleeve 18 is inserted into the tail of the inner slider shovel base step hole and is circumferentially limited. The inner wall of the inner slider shovel base connecting sleeve 18 is provided with threads. The bolt 6 is inserted from the head and the neck and is threadedly connected to the inner slider shovel base connecting sleeve 18, so that the inner slider shovel base 1 and the inner slider shovel base connecting sleeve 18 are fixedly connected together.

[0026] The fixed connection between the bottom plate 15 and the other end of the inner slider shovel base 1 refers to the bottom plate 15 being provided with a bottom plate step hole arranged vertically through, the bottom plate step hole being divided into three sections, namely the head, the neck and the tail, the inner diameter of the head and the tail being larger than the inner diameter of the neck; the tail and the neck of the bottom plate step hole are circular for the bolt 21 to be inserted, a protrusion is provided on the inner side surface of the head of the bottom plate step hole, the outer edge of the lower part of the inner slider shovel base connecting sleeve 18 is recessed to form a lower anti-rotation surface 23 that cooperates with the protrusion of the head of the bottom plate step hole, the lower part of the inner slider shovel base connecting sleeve 18 is inserted into the head of the bottom plate step hole and is circumferentially limited. The inner wall of the inner slider shovel base connecting sleeve 18 is provided with threads, the bolts 21 are inserted from the bottom surface of the bottom plate 15 and are threadedly connected with the inner slider shovel base connecting sleeve 18, so that the bottom plate 15 and the inner slider shovel base connecting sleeve 18 are fixedly connected together.

[0027] The head of the bottom plate step hole and the inner slider shovel base connecting sleeve 18 have a clearance of less than 0.01mm, and the tail of the inner slider shovel base step hole and the inner slider shovel base connecting sleeve 18 have a clearance of less than 0.01mm, so that the central axis of the inner slider shovel base 1 is perpendicular to the lower die base 10.

[0028] An inverted conical circular hole 19 is provided on the upper part of the lower die base 10, and the inner slider 2 and the inner slider shovel base 1 are inserted into the inverted conical circular hole 19, and the generatrix on the side of the inverted conical circular hole 19 forms an angle A of 3-10 degrees with the vertical. The matching clearance of the inverted conical circular hole 19, the inner slider 2 and the inner slider shovel base 1 is within 0.01mm.

[0029] The inner slider reset mechanism includes a cylindrical hole 20 provided at the lower part of the lower die base 10, the contour of the cylindrical hole 20 is larger than the lower end opening of the inverted cone circular hole 19, a pad 9 is provided in the cylindrical hole 20, the pad 9 is installed in the cylindrical hole 20 of the lower die plate 10 and moves up and down in the cylindrical hole 20; a pad circular through hole for accommodating the inner slider shovel base connecting sleeve 18 is provided on the pad 9, and the inner slider shovel base connecting sleeve 18 and the pad circular through hole are clearance-matched. A plurality of reset springs 16 are fixedly provided at the bottom of the pad 9. In this embodiment, the reset springs 16 are 4 rectangularly distributed around the inner slider shovel base connecting sleeve 18, and 4 corresponding spring mounting holes are provided on the upper surface of the bottom plate 15, and the reset spring 16 is located between the pad 9 and the bottom plate 15. After the hydraulic press is reset, the pad 9 pushes out the inner slider 2 under the action of the reset spring 16, and the inner slider rises and radially loosens the annular part 17. The stroke S2 ​​of the pad 9 is equal to the height of the cylindrical hole minus the thickness of the pad 9; at the same time, S2=S1 / tan A; here S1 is the radial stroke of the slider, which is 0.2-3mm.

[0030] The backing plate 9 is a quadrangular prism or a polygonal prism. The cylindrical hole 20 is a quadrangular prism or a polygonal prism consistent with the backing plate 9.

[0031] An upper template 11 is arranged above the lower die base 10, and four guide pillars 12 are fixedly arranged on the upper template 11. The four guide pillars 12 are distributed in a rectangular shape around the inverted cone-shaped circular hole 19, and four guide sleeves 13 are correspondingly arranged on the lower die base 10. The guide pillars 12 are inserted into the guide sleeves 13 to enable the upper template 11 to move up and down relative to the lower die base 10.

[0032] When in use, the upper template 11 is fixedly installed on the hydraulic press through the panel, and the circular part is placed on the workpiece bearing surface 8 of the step-shaped shaping working surface. The panel 14 and the bottom plate 15 are respectively squeezed by the upper template 11 and the annular part 17 on the lower die seat 10 under the guidance of the guide column 12 and the guide sleeve 13. The upper template 11 squeezes the annular part 17 and drives the inner slider 2 at the same time. During the process of the inner slider 2 moving down along the inner slider shovel base 1 and the inverted cone-shaped circular hole 19 of the lower die seat 10, the annular part 17 is subjected to the pressure of the upper template 11 so that the inner slider 2 descends along the inner slider shovel base 1. During this process, the vertical surface 7 of the step-shaped shaping working surface radially applies force to the annular part 17 from the outside to the inside to complete the roundness shaping of the annular part 17. When the inner slider 2 continues to move to the bottom dead point of the stroke, the upper template 11 and the workpiece bearing surface 8 of the inner slider 2 apply force to the annular part 17 up and down to complete the flatness shaping of the annular part 17, and correct the deformation caused by the inner slider 2 squeezing the annular part 17. After shaping, the hydraulic press is reset, the upper mold plate 11 moves upward, and the backing plate 9 is evenly pushed out of the inner slider 2 under the action of the reset spring 16 and the annular part 17 is released.

[0033] The shaped product in this embodiment is a single product of a tube tube stop gasket. The roundness and flatness are measured using a surveying instrument. The roundness before shaping is 0.8mm, and the roundness of the vertical surface 7 of the stepped shaping working surface of the inner sliding block 2 is 0.01mm. The tube tube stop gasket is placed on the workpiece bearing surface 8 of the stepped shaping working surface. Through uniform and stable extrusion by the upper template 11 and the lower die base 10, the inner sliding block 2 moves downward along the inner sliding block shovel base 1 and the inverted cone circular hole 19 on the lower die base 10. The vertical surface 7 of the stepped shaping working surface on the upper template 11 and the lower die base 10 extrude and shape the tube tube stop gasket. After shaping, the roundness of the tube tube stop gasket is 0.08mm, and the flatness is 0.05mm.

[0034] Embodiment 2: The similarities between this embodiment and embodiment 1 are not repeated here, except that the direction in which the inner slider 2 moves along the shovel base guide 3 is 15 degrees from the central axis of the inner slider shovel base 1. The vertical surfaces 7 of the step-shaped shaping working surfaces on all the inner sliders 2 are assembled into a circular ring shape, and the roundness is 0.03 mm.

[0035] The shaped product in this embodiment is a single product of a tube stop gasket. The roundness and flatness are measured using a surveying instrument. The roundness before shaping is 0.8 mm. The tube stop gasket is placed on the workpiece bearing surface 8 of the stepped shaping working surface. The tube stop gasket is extruded and shaped by uniform and stable extrusion of the upper template 11 and the lower mold base 10. The roundness of the tube stop gasket after shaping is 0.09 mm, and the flatness is 0.04 mm.

[0036] Example 3

[0037] The shaped product this time is a batch product of the tube stop gasket, made of stainless steel, with 36 pieces drawn. The roundness and flatness before shaping are shown in the following table. The vertical surface 7 of the step-shaped shaping working surface on all the inner slides 2 is annular after splicing, and its roundness is 0.03mm. The tube stop gasket is placed on the workpiece bearing surface 8 of the step-shaped shaping working surface, and the tube stop gasket is extruded and shaped by uniform and stable extrusion of the upper template 11 and the lower die seat 10. After the tube stop gasket is shaped, the roundness data and flatness data are measured using a surveying instrument. The obtained data are as follows: (Unit: mm)

[0038]

[0039] The results show that the roundness of the products after shaping is within 0.1mm and the flatness is within 0.05mm.

Claims

1. A circular ring-shaped parts shaping device, comprising a bottom plate and a lower die seat fixedly arranged on the bottom plate, characterized in that It also includes an inner slider arranged in the lower die seat and an inner slider shovel base in the shape of a truncated cone, the inner slider shovel base is fixedly connected to the bottom plate; a plurality of shovel base guides and inner sliders corresponding to the shovel base guides are arranged on the outer periphery of the inner slider shovel base, the inner slider reciprocates in the lower die seat under the guidance of the shovel base guides; an inner slider reset mechanism is arranged on the lower die seat; an inner side of the top of the inner slider is provided with an inwardly concave step-shaped shaping working surface, the step-shaped shaping working surface includes a vertical surface and a workpiece bearing surface; the vertical surfaces of the step-shaped shaping working surfaces on all the inner sliders are assembled to form a circular ring; a limit hanging device is provided at the bottom of the inner side of the inner slider, which radially protrudes and extends to the bottom of the inner slider shovel base. Table; the radial dimension of the workpiece bearing surface is larger than the spacing between the inner and outer circumferences of the annular part; the height of the vertical surface is lower than the thickness of the annular part; the shovel base guide path refers to a plurality of longitudinally distributed tooth-like protrusions arranged on the outer circumference of the shovel base of the inner slider, and a shovel base guide path is formed between adjacent tooth-like protrusions; the inner side surface of each inner slider is provided with a longitudinally extending slider protrusion, which is inserted into the corresponding shovel base guide path and slides relative to the shovel base guide path; the direction in which the inner slider moves along the shovel base guide path is 3-10 degrees from the central axis of the inner slider shovel base; the vertical surfaces of the step-shaped shaping working surfaces on all the inner sliders are annular after being spliced ​​together, and the roundness is 0.01mm.

2. The annular parts shaping device according to claim 1, characterized in that The inner slider is composed of eight pieces. The upper end surface of each inner slider includes the inner slider top surface, the vertical surface, the workpiece bearing surface and the slider protrusion. The top edge of the vertical surface is connected with the inner slider top surface, the bottom edge of the vertical surface is connected with the workpiece bearing surface, and the workpiece bearing surface is connected with the top of the slider protrusion.

3. The annular part shaping device according to claim 1, characterized in that The inner slider shovel base is fixedly connected to the bottom plate by an inner slider shovel base connecting sleeve, that is, the inner slider shovel base is fixedly connected to one end of the inner slider shovel base connecting sleeve, and the bottom plate is fixedly connected to the other end of the inner slider shovel base connector.

4. The annular part shaping device according to claim 3 is characterized in that The fixed connection between the inner slider shovel base and one end of the inner slider shovel base connecting sleeve refers to an inner slider shovel base step hole that is axially penetrated in the middle of the inner slider shovel base, and the inner slider shovel base step hole is divided into three sections: a head, a neck and a tail, and the inner diameters of the head and the tail are larger than the inner diameter of the neck; the head and the neck of the inner slider shovel base step hole are circular for bolts to be inserted, and a protrusion is provided on the inner side surface of the tail of the inner slider shovel base step hole, and the upper outer edge portion of the inner slider shovel base connecting sleeve is recessed to form an upper stop surface that cooperates with the protrusion at the tail of the inner slider shovel base step hole, and the upper portion of the inner slider shovel base connecting sleeve is inserted into the tail of the inner slider shovel base step hole and limited circumferentially; the bolt is inserted from the head and the neck and threadedly connected to the inner slider shovel base connecting sleeve, so that the inner slider shovel base and the inner slider shovel base connecting sleeve are fixedly connected together.

5. The annular part shaping device according to claim 3 is characterized in that The fixed connection between the bottom plate and the other end of the inner slider shovel base means that a bottom plate step hole is arranged vertically through the bottom plate, and the bottom plate step hole is divided into three sections: head, neck and tail, and the inner diameters of the head and tail are larger than the inner diameter of the neck; the tail and neck of the bottom plate step hole are circular for bolts to be inserted, and a protrusion is provided on the inner side surface of the head of the bottom plate step hole, and the lower outer edge portion of the inner slider shovel base connecting sleeve is recessed to form a lower anti-rotation surface cooperating with the protrusion of the head of the bottom plate step hole, the lower part of the inner slider shovel base connecting sleeve is inserted into the head of the bottom plate step hole and circumferentially limited, and the bolts are inserted from the bottom surface of the bottom plate and threadedly connected to the inner slider shovel base connecting sleeve, so that the bottom plate and the inner slider shovel base connecting sleeve are fixedly connected together.

6. The annular part shaping device according to claim 4 or 5, characterized in that The head of the bottom plate step hole and the inner slider shovel base connecting sleeve have a clearance of less than 0.01mm, and the tail of the inner slider shovel base step hole and the inner slider shovel base connecting sleeve have a clearance of less than 0.01mm, so that the central axis of the inner slider shovel base is perpendicular to the lower die base.

7. The annular part shaping device according to claim 1, characterized in that An inverted tapered circular hole is arranged on the upper part of the lower die seat, and the inner slider and the inner slider shovel base are inserted into the inverted tapered circular hole. The generatrix on the side of the inverted tapered circular hole forms an angle of 3-10 degrees with the vertical; the matching clearance among the inverted tapered circular hole, the inner slider and the inner slider shovel base is within 0.01mm.

8. The annular part shaping device according to claim 1, characterized in that The inner slider reset mechanism includes a cylindrical hole arranged at the lower part of the lower mold base, the contour of the cylindrical hole is larger than the lower end opening of the inverted cone circular hole, a pad is arranged in the cylindrical hole, the pad is inserted into the cylindrical hole of the lower mold plate and moves up and down in the cylindrical hole; a pad circular through hole for accommodating the inner slider shovel base connecting sleeve is arranged on the pad, and a clearance fit exists between the inner slider shovel base connecting sleeve and the pad circular through hole; a plurality of reset springs are fixedly arranged at the bottom of the pad, and the reset springs are located between the pad and the bottom plate.

9. The annular part shaping device according to claim 8, characterized in that The backing plate is a polygonal column, and the shape of the cylindrical hole is consistent with that of the backing plate.

10. The annular part shaping device according to claim 1, characterized in that An upper template is arranged above the lower die seat, a guide column is fixedly arranged on the upper template, a guide sleeve is arranged on the lower die seat, and the guide column is inserted into the guide sleeve to enable the upper template to move up and down relative to the lower die seat.

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