Special-shaped shrinking mold

Abstract

The present invention discloses a special-shaped shrinking die, comprising an upper die and a lower die that cooperate with each other, the lower die is located directly below the upper die; the upper die comprises a concave die, the upper die guide pin located in the inner cavity of the concave die is fixedly connected to the concave die; the top end of the upper die guide pin goes downward beyond the top of the concave die; the inner cavity of the concave die is narrow at the bottom and wide at the top; the lower die comprises a lower die base assembly; a square bottom plate connecting frame is fixedly arranged on the lower die base assembly, an upper bottom plate is fixedly arranged on the top of the bottom plate connecting frame, and a lower die guide sleeve is arranged in the upper bottom plate; a special-shaped channel I is arranged in the upper bottom plate; a channel III formed by four inserting knife guide sliders symmetrically distributed at four corners is arranged in the inner cavity of the bottom plate connecting frame; a push block inserting knife is arranged in channel III. The special-shaped shrinking die of the present invention can realize the stable positioning of large-sized boxes or special-shaped workpieces, solve the problem of positioning accuracy during molding; and avoid the deformation problem of the workpiece itself.

Description

Technical Field

[0001] The invention relates to a stamping die, in particular to a large-sized special-shaped shrinking die. Background Art

[0002] At present, large-sized and special-shaped parts are difficult to form due to their large size and weight, and the deformation caused by their own gravity when static. Taking the shrinkage of the direction box as an example, the traditional processing technology has the problem of difficulty in accurate positioning, the body is easily deformed during the forming process, and the yield rate is low. In addition, the workpiece itself is heavy, the assembly and disassembly speed is slow, and the processing efficiency is not high.

[0003] Therefore, it is necessary to improve the existing technology. Summary of the invention

[0004] The invention provides a necking die which is easy to use and has high positioning accuracy.

[0005] In order to solve the above technical problems, the present invention provides a special-shaped shrinking mold, comprising an upper mold and a lower mold that work in cooperation with each other, wherein the lower mold is located directly below the upper mold;

[0006] The upper die comprises a concave die, and an upper die guide pin located in the inner cavity of the concave die is fixedly connected to the concave die; the top end of the upper die guide pin extends downward beyond the top of the concave die; the inner cavity of the concave die is narrow at the bottom and wide at the top;

[0007] The lower mold includes a lower mold base assembly;

[0008] A square frame-shaped bottom plate connecting frame is fixedly arranged on the bottom die base assembly, an upper bottom plate is fixedly arranged on the top of the bottom plate connecting frame, a lower die guide sleeve is arranged in the upper bottom plate; a special-shaped channel I is arranged in the upper bottom plate;

[0009] A channel III is provided in the inner cavity of the bottom plate connecting frame, which is surrounded by four inserting knife guide slide blocks symmetrically distributed at four corners; a push block inserting knife is provided in the channel III;

[0010] The push block inserter comprises a cubic frame with a top surface but no bottom surface. The top of the push block inserter frame passes through the special-shaped channel I upwards and is located above the upper end bottom plate. A top surface channel is provided on the top surface of the push block inserter frame, and the top surface channel is located directly below the upper die pressing block. The lower die guide sleeve is located directly below the top surface channel.

[0011] Four upper convex parts are symmetrically distributed at the four corners on the top of the push block inserting knife frame, and four lower convex parts are symmetrically distributed at the four corners on the bottom of the push block inserting knife frame. The upper convex parts and the lower convex parts have the same structure, and both have lower cut corners at the lower half of the outer wall.

[0012] Four sets of upper elastic components are arranged on the upper surface of the upper bottom plate and are symmetrically distributed in four corners. Each set of upper elastic components is composed of an upper elastic member stopper, an upper push block elastic member, and an upper forming push block which are sequentially connected from the inside to the outside. The upper elastic member stopper is connected to the frame of the push block inserter. An upper cut angle matching the lower cut angle of the upper convex part is arranged on the upper half of the inner side wall of the upper forming push block. The working section of the outer side wall of the upper forming push block matches the inner cavity side wall of the concave mold.

[0013] Four sets of lower elastic components are arranged on the lower die base component and are symmetrically distributed at four corners. Each set of lower elastic components is composed of a lower elastic member stopper, a lower push block elastic member, and a lower positioning push block which are sequentially connected from the inside to the outside; the lower elastic member stopper is connected to the frame of the push block inserting knife; the inner side wall of the lower positioning push block is provided with an upper cutting angle matched with the lower cutting angle of the lower convex part;

[0014] An inner cavity bottom surface is arranged in the inner cavity of the push block inserting knife frame; a lower mold elastic member is arranged on the lower mold base assembly, and the lower mold elastic member abuts against the inner cavity bottom surface;

[0015] A special-shaped channel II is provided on the lower mold base assembly, and the axis center line of the special-shaped channel II coincides with the axis center line of the special-shaped channel I; the upper convex part does not contact the special-shaped channel I when passing through the special-shaped channel I; and the lower convex part does not contact the special-shaped channel II when passing through the special-shaped channel II.

[0016] As an improvement of the special-shaped necking mold of the present invention:

[0017] Four workpiece positioning members are arranged on the periphery of the bottom plate connecting frame and are symmetrically distributed at four corners, the bottom of the workpiece positioning member is fixedly connected to the lower die base assembly, and the top of the workpiece positioning member is flush with the upper surface of the upper end bottom plate;

[0018] The workpiece positioning member is provided with a transverse channel corresponding to the lower end positioning push block.

[0019] As a further improvement of the special-shaped necking mold of the present invention:

[0020] The lower mold base assembly includes a lower bottom plate, a lower pad and a lower back plate which are fixedly connected in sequence from top to bottom, and the lower bottom plate, the lower pad and the lower back plate are provided with intersecting special-shaped channels II;

[0021] A bottom plate connecting frame is fixedly arranged on the upper surface of the bottom plate at the lower end;

[0022] The lower mold elastic member installed on the upper surface of the lower back plate passes through the lower pad and the lower end bottom plate in sequence, and the top end of the lower mold elastic member abuts against the bottom surface of the inner cavity;

[0023] The bottom of the workpiece positioning piece is fixedly connected to the upper surface of the lower pad.

[0024] Four sets of lower elastic components are arranged on the upper surface of the bottom plate at the lower end and are symmetrically distributed at four corners.

[0025] As a further improvement of the special-shaped necking mold of the present invention:

[0026] The cross-section of the lower back plate, the cross-section of the lower pad, and the cross-section of the lower end bottom plate are reduced in sequence.

[0027] As a further improvement of the special-shaped necking mold of the present invention:

[0028] An upper mold pressing block is fixedly arranged at the center of the bottom surface of the inner cavity of the concave mold, and the cross section of the upper mold pressing block is smaller than the inner cavity bottom surface of the concave mold;

[0029] An upper back plate fixedly connected to the concave die is arranged above the concave die.

[0030] As a further improvement of the special-shaped necking mold of the present invention:

[0031] Channel III coincides with the frame of the push block insert.

[0032] In the present invention, the workpiece locating piece plays a role in static positioning of large-sized box parts, which can prevent them from being deformed under the action of their own gravity when static, thus solving the positioning problem. The lower end positioning push block plays a further role in tightening and positioning the box parts during the mold forming process, thus solving the problem of positioning accuracy. The above components can play a role at the same time to further greatly improve the parts qualification rate.

[0033] The special-shaped necking mold of the present invention can meet product technical requirements and improve product quality and work efficiency.

[0034] The special-shaped shrinking mold of the present invention can realize the stable positioning of a large-sized box or a special-shaped workpiece, solve the problem of positioning accuracy during molding; and avoid the deformation problem of the workpiece itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0036] Figure 1 It is a structural schematic diagram of the special-shaped necking mold of the present invention when the mold is opened;

[0037] Figure 2 for Figure 1 Schematic diagram of the structure when the mold is closed;

[0038] Figure 3 for Figure 2 Schematic diagram of the middle AA section; DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0040] Embodiment 1: A special-shaped necking mold, such as Figures 1 to 3 As shown in FIG. 1 , the upper die and the lower die are included. The lower die is located directly below the upper die and cooperates with the upper die to work. When the stretch extrusion die is not working or is in the initial state, the upper die and the lower die are separated, as shown in FIG. Figure 1 shown.

[0041] The upper die comprises an upper back plate 1 , a concave die 2 , an upper die pressing block 3 and an upper die guide column 4 .

[0042] The outer bottom surface of the die 2 is fixedly connected to the lower surface of the upper back plate 1. The inner cavity of the die 2 is a trapezoidal cavity with a narrow bottom and a wide top. An upper die pressing block 3 is fixedly arranged at the center of the bottom surface 23 of the trapezoidal cavity of the die 2. The cross section of the upper die pressing block 3 is much smaller than the bottom surface 23 of the trapezoidal cavity of the die 2. The upper die guide pin 4 passes through the upper die pressing block 3 and the die 2 and is connected to the upper back plate 1. That is, the above four are fixed as one body, so that when the mold is working, all the parts of the upper die move up and down as a whole. The top 41 of the upper die guide pin 4 goes downward beyond the top 22 of the die 2.

[0043] The lower mold includes a lower mold base assembly; the lower mold base assembly includes a lower end bottom plate 12, a lower pad 13 and a lower back plate 14 fixedly connected in sequence from top to bottom; the cross section of the lower back plate 14 is greater than the cross section of the lower pad 13 and the cross section of the lower end bottom plate 12.

[0044] A square frame-shaped bottom plate connecting frame 10 is fixedly arranged on the upper surface of the lower bottom plate 12, an upper bottom plate 9 is fixedly arranged on the top of the bottom plate connecting frame 10, and a lower mold guide sleeve 18 is arranged in the upper bottom plate 9. A special-shaped channel I is also arranged in the upper bottom plate 9.

[0045] A channel III formed by four inserting blade guide sliders 24 symmetrically distributed at four corners is arranged in the inner cavity of the bottom plate connecting frame 10; that is, the four inserting blade guide sliders 24 are evenly and symmetrically arranged in the inner cavity of the bottom plate connecting frame 10, and the space enclosed by the four inserting blade guide sliders 24 serves as the channel III. The push block inserting blade 5 is arranged in the channel III.

[0046] The push block inserter 5 includes a cubic frame with a top surface but no bottom surface. The top of the frame of the push block inserter 5 passes through the special-shaped channel I upward and is located above the upper end bottom plate 9. A top surface channel 53 is provided on the top surface of the frame of the push block inserter 5. The top surface channel 53 is located directly below the upper mold block 4; and the aperture of the top surface channel 53 is equal to the diameter of the upper mold guide column 4. When the upper and lower molds are closed, the upper mold guide column 4 passes through the top surface channel 53.

[0047] The cross section of the upper mold block 3 is substantially equal to the top surface of the frame of the push block insert 5 .

[0048] Four upper protrusions 51 are symmetrically arranged at the top of the frame of the push block inserting knife 5 (i.e., one upper protrusion 51 is arranged on each of the four sides of the top of the frame of the push block inserting knife 5), and four lower protrusions 52 are symmetrically arranged at the bottom of the frame of the push block inserting knife 5. The upper protrusions 51 and the lower protrusions 52 have the same structure, and both are provided with lower cut corners 512 at the lower half of the outer wall; that is, the outer wall is composed of a vertical surface 511 and a lower cut corner 512 (in a slope shape) located below the vertical surface 511. The upper protrusions 51, the lower protrusions 52 and the frame of the push block inserting knife 5 are integrated.

[0049] An inner cavity bottom surface 54 is arranged in the inner cavity of the frame of the push block insert 5, and the inner cavity bottom surface 54 is close to the bottom of the frame.

[0050] A connected special-shaped channel II is provided in the center of the lower bottom plate 12, the lower pad 13 and the lower back plate 14, and the special-shaped channel II coincides with the axis of the special-shaped channel I in the upper bottom plate 9; and the shapes and dimensions of the special-shaped channel I and the special-shaped channel II are the same, and the shape and dimension of the special-shaped channel I are required to ensure that the push block insert 5 with the upper protrusion 51 does not contact the special-shaped channel I when passing through (that is, the shape and dimension of the special-shaped channel I> the outer dimensions of the push block insert 5 with the upper protrusion 51); similarly, the shape and dimension of the special-shaped channel II are also required to ensure that the push block insert 5 with the lower protrusion 52 does not contact the special-shaped channel II when passing through.

[0051] The shape and size of channel III = the outer dimensions of the frame of the push block inserting blade 5 (i.e., the outer dimensions of the vertical side in the middle of the frame of the push block inserting blade 5). Therefore, the push block inserting blade 5 can move up and down through this channel III, and channel III plays a positioning and guiding role.

[0052] Four sets of upper elastic components are arranged on the upper surface of the upper bottom plate 9 in a symmetrical distribution at four corners; each set of upper elastic components includes an upper elastic member stopper 20, an upper push block elastic member 19 and an upper molded push block 6, and the upper elastic member stopper 20, the upper push block elastic member 19 and the upper molded push block 6 are sequentially connected from the inside to the outside; the upper elastic member stopper 20 is connected to the frame of the push block insert 5; therefore, the upper molded push block 6 can be moved along the upper surface of the upper bottom plate 9 under the telescopic elastic action of the upper push block elastic member 19. When the mold is closed, due to the squeezing effect of the push block knife 5 on the upper forming push block 6, the four upper forming push blocks 6 move toward the periphery at the same time to cooperate with the die 2 to achieve the required shrinkage forming of the workpiece 7. When the mold is opened, the push block knife 5 moves upward to cancel the squeezing effect on the upper forming push block 6. Under the retraction effect of the upper push block elastic member 19, the four upper forming push blocks 6 move toward the center of the upper bottom plate 9 at the same time, leaving the workpiece, making it easier for the robot to take the workpiece 7 out of the mold.

[0053] The structure of each upper end forming push block 6 is as follows:

[0054] The inner side wall of the upper end forming push block 6 is composed of an inner straight surface located in the lower half and an upper cut corner 61 (an inner bevel) located in the upper half. The upper cut corner 61 is parallel to and matched with the lower cut corner 512 (in a bevel shape) of the upper convex part 51. The inner straight surface of the upper end forming push block 6 is parallel to and matched with the vertical surface 511 of the upper convex part 51. Therefore, when the push block insert 5 moves downward, the upper cut corner 61 can be completely in contact with the lower cut corner 512 of the upper convex part 51. Moreover, the inner straight surface of the upper end forming push block 6 is slightly closer to the central axis of the push block insert 5 relative to the vertical surface 511 of the upper convex part 51. Therefore, the upper end forming push block 6 gradually moves toward the periphery after being squeezed.

[0055] The outer side wall of the upper molding push block 6 is composed of an outer straight surface located in the lower half and a working section 62 (an outer inclined surface) located in the upper half. The working section 62 cooperates with the inner cavity side wall 21 of the die 2.

[0056] The lower mold elastic member 15 installed on the upper surface of the lower back plate 14 passes through the lower pad 13 and the lower end bottom plate 12 in sequence, and then the top end of the lower mold elastic member 15 abuts against the inner cavity bottom surface 54 in the frame inner cavity of the push block inserting knife 5. Therefore, the push block inserting knife 5 is positioned at the center of the lower mold through the channel III and can move up and down under the action of the lower mold elastic member 15.

[0057] Four workpiece positioning members 8 are symmetrically distributed at four corners and arranged on the periphery of the bottom plate connecting frame 10 . The workpiece positioning members 8 are fixedly connected to the upper surface of the lower pad 13 and are flush with the upper surface of the upper bottom plate 9 .

[0058] Similarly, four sets of lower elastic components are arranged on the upper surface of the lower bottom plate 12 in a symmetrical distribution at four corners; each set of lower elastic components includes a lower elastic member stopper 17, a lower push block elastic member 16 and a lower positioning push block 11, and the lower elastic member stopper 17, the lower push block elastic member 16 and the lower positioning push block 11 are sequentially connected from the inside to the outside; the lower elastic member stopper 17 is connected to the frame of the block insert 5; therefore, under the elastic effect of the elastic member 16 of the lower push block, the lower positioning push block 11 can be moved along the lower bottom plate When the mold is closed, due to the squeezing effect of the push block inserter 5 on the lower end positioning push block 11, the four lower end positioning push blocks 11 move toward the periphery at the same time and cooperate with the workpiece positioning member 8 to firmly position the workpiece 7 in the mold during shrinkage molding. When the mold is opened, the push block inserter 5 moves upward to cancel the squeezing effect on the lower end positioning push block 11. Under the retraction effect of the lower end push block elastic member 16, the lower end positioning push block 11 moves toward the center of the lower end bottom plate 12 at the same time, leaving the workpiece, so that the robot can take the workpiece 7 out of the mold.

[0059] A transverse channel corresponding to the lower end positioning push block 11 is provided on the side wall of the workpiece positioning member 8; and because the base plate connecting frame 10 is a frame-shaped bracket, the lower end positioning push block 11 can pass through the base plate connecting frame 10 and the transverse channels on the side wall of the workpiece positioning member 8 in sequence.

[0060] The inner side wall of the lower end positioning push block 11 is composed of an inner straight surface located in the lower half and an upper cut corner 111 (an inner bevel) located in the upper half. The upper cut corner 111 is parallel to and matched with the lower cut corner 512 (in the shape of a bevel) of the lower convex portion 52. Therefore, when the push block insert 5 moves downward, the upper cut corner 111 and the lower cut corner 512 of the lower convex portion 52 can be completely in contact. The inner straight surface of the lower end positioning push block 11 is parallel to and matched with the vertical surface 511 of the lower convex portion 52. Moreover, the inner straight surface of the lower end positioning push block 11 is slightly closer to the central axis of the push block insert 5 relative to the vertical surface 511 of the lower convex portion 52. Therefore, the lower end positioning push block 11 is squeezed and gradually moves toward the periphery.

[0061] When the push block insert 05 moves up and down in the mold, the up and down movement can be converted into horizontal movement through the abutment sliding of the inclined surface, thereby realizing the movement of the upper molding push block 6 and the lower positioning push block 11.

[0062] The lower mold elastic member 15 adopts a nitrogen spring.

[0063] The working process of the shrinking mold is as follows:

[0064] 1. Place workpiece 7:

[0065] The workpiece 7 to be processed is mounted on the periphery of the workpiece positioning member 8. Since the inner cavity size of the workpiece 7 is consistent with the outer size formed by the four workpiece positioning members 8, the workpiece 7 can be fixedly placed on the lower die processing position by the workpiece positioning member 8, and the bottom end of the workpiece 7 is located on the upper surface of the lower pad 13 and is placed statically (such as Figure 1 The top of the workpiece 7 to be shrunken is located at the working section 62 of the outer side wall of the upper molding push block 6 .

[0066] At this time, the outer wall of the upper molding push block 6 maintains a certain gap with the workpiece 7, that is, the two are not in contact; similarly, the outer wall of the lower positioning push block 11 also maintains a certain gap with the workpiece 7.

[0067] 2. Mold forming: The upper and lower molds are closed to complete the shrinking action.

[0068] The details are as follows:

[0069] The punching machine applies downward pressure on the upper die, so that all the parts of the upper die move downward together; during the pressing process, the upper die guide column 4 first contacts the lower die guide sleeve 18 after passing through the top surface channel 53, thereby pre-aligning all the parts of the upper die with the lower die, and guiding the positions of all the parts of the upper and lower dies during the mold closing process; then the punch continues to press downward, and when the upper die moves to the point where the lower surface of the upper die pressing block 3 contacts the top surface of the push block insert 5, the push block insert 5 begins to move downward under the pressure of the upper die pressing block 3. During this process, the lower cut corner 512 of the upper protrusion 51 gradually abuts and slides with the upper cut corner 61 of the upper end forming push block 6, and at the same time, the lower cut corner 512 of the lower protrusion 52 gradually abuts and slides with the upper cut corner 111 of the lower end positioning push block 11.

[0070] The upper molding push block 6 and the lower positioning push block 11 gradually move toward the periphery under the pressure of the inclined surface, and finally the upper mold pressing block 3 presses the push block insert 5 down until the vertical surface 511 of the upper protrusion 51 is completely in contact with the inner straight surface of the upper molding push block 6. At the same time, the vertical surface 511 of the lower protrusion 52 is completely in contact with the inner straight surface of the lower positioning push block 11 (see Figure 2 At this time, the outer wall of the lower positioning push block 11 contacts the workpiece 7, thereby preventing the workpiece 7 from being deformed; and the top of the workpiece 7 to be shrunken is located between the working section 62 of the outer wall of the upper forming push block 6 and the inner cavity side wall 21 of the die 2. Finally, the die 2 and the upper die forming push block 6 jointly squeeze the top of the workpiece 7 to be shrunken, so that the top of the workpiece 7 to be shrunken follows the inner cavity side wall 21 of the die 2 and the working section 62 of the upper die forming push block 6 to bend inward (see Figure 2 ), when the bottom surface 23 of the trapezoidal inner cavity of the female die 2 and the upper surface of the upper die forming push block 6 are separated by a material thickness h of the workpiece 7, the mold is closed in place.

[0071] When the mold is closed, Figure 2 described.

[0072] 3. Reset: Separate the upper and lower molds and take the processed workpiece 7 out of the mold.

[0073] The details are as follows:

[0074] When the mold is closed in place in the above step, it means that the workpiece 7 is processed, and the stamping machine cancels the pressure applied to the upper mold and drives all parts of the upper mold back to the mold opening position (such as Figure 1); the upper back plate 1 drives all parts of the upper mold to move upward as a whole, the upper mold guide column 4 is separated from the lower mold guide sleeve 18 and the top surface channel 53, and finally the upper mold is completely separated from the lower mold; the lower mold elastic member 15 applies an upward elastic restoring force to the push block inserter 5 to push the push block inserter 5 upward. In this process, as far as the upper protrusion 51 is concerned, first, the vertical surface 511 of the upper protrusion 51 is separated from the inner straight surface of the upper end forming push block 6, and then, the lower cut corner 512 of the upper protrusion 51 is separated from the upper cut corner 61 of the upper end forming push block 6; at the same time, correspondingly, as far as the lower protrusion 52 is concerned, first, the vertical surface 511 of the lower protrusion 52 is separated from the inner straight surface of the lower end positioning push block 11, and then, the lower cut corner 512 of the lower protrusion 52 is separated from the upper cut corner 111 of the lower end positioning push block 11. The upper molding push block 6 and the lower positioning push block 11 are respectively retreated to the initial position (such as Figure 1 ). Finally, the lower mold elastic member 15 returns from the compressed state to the fully extended state, and the mold separation is completed.

[0075] Finally, it should be noted that the above examples are only some specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. Special-shaped shrinking mold, its characteristics are: It includes an upper die and a lower die that work in cooperation with each other, and the lower die is located directly below the upper die; The upper die comprises a die (2); an upper die guide post (4) located in the inner cavity of the die (2) is fixedly connected to the die (2); a top end (41) of the upper die guide post (4) extends downward beyond a top end (22) of the die (2); and the inner cavity of the die (2) is narrow at the bottom and wide at the top. The lower mold includes a lower mold base assembly; A square frame-shaped bottom plate connecting frame (10) is fixedly arranged on the bottom plate connecting frame (10), an upper bottom plate (9) is fixedly arranged on the top of the bottom plate connecting frame (10), a lower die guide sleeve (18) is arranged in the upper bottom plate (9); and a special-shaped channel I is arranged in the upper bottom plate (9); A channel III formed by four inserting blade guide slide blocks (24) symmetrically distributed at four corners is arranged in the inner cavity of the bottom plate connecting frame (10); a push block inserting blade (5) is arranged in the channel III; The push block inserting knife (5) comprises a cubic frame having a top surface but no bottom surface, the top of the frame of the push block inserting knife (5) passing upward through the special-shaped channel I and then being located above the upper end bottom plate (9); a top surface channel (53) is provided on the top surface of the frame of the push block inserting knife (5), and the top surface channel (53) is located directly below the upper mold pressing block (3); and the lower mold guide sleeve (18) is located directly below the top surface channel (53); Four upper protrusions (51) are symmetrically distributed at four corners on the top of the frame of the push block insert (5), and four lower protrusions (52) are symmetrically distributed at four corners on the bottom of the frame of the push block insert (5), and the upper protrusions (51) and the lower protrusions (52) have the same structure, that is, lower cut corners (512) are provided at the lower half of the outer wall; Four sets of upper elastic components are arranged on the upper surface of the upper bottom plate (9) and are symmetrically distributed in four corners. Each set of upper elastic components is composed of an upper elastic member stopper (20), an upper push block elastic member (19), and an upper molding push block (6) which are connected in sequence from the inside to the outside; the upper elastic member stopper (20) is connected to the frame of the push block insert (5); an upper cut corner (61) matching with a lower cut corner (512) of the upper convex portion (51) is arranged on the upper half of the inner side wall of the upper molding push block (6); and a working section (62) of the outer side wall of the upper molding push block (6) matches with the inner cavity side wall (21) of the concave mold (2); Four sets of lower elastic components are arranged on the lower mold base component and are symmetrically distributed at four corners. Each set of lower elastic components is composed of a lower elastic member stopper (17), a lower push block elastic member (16), and a lower positioning push block (11) which are connected in sequence from the inside to the outside. The lower elastic member stopper (17) is connected to the frame of the push block insert (5). The inner side wall of the lower positioning push block (11) is provided with an upper cutting angle (111) which matches the lower cutting angle (512) of the lower protrusion (52). An inner cavity bottom surface (54) is provided in the inner cavity of the frame of the push block insert (5); a lower mold elastic member (15) is provided on the lower mold base assembly, and the lower mold elastic member (15) abuts against the inner cavity bottom surface (54); The lower die base assembly is provided with a shaped channel II, and the axis of the shaped channel II coincides with the axis of the shaped channel I; the upper convex portion (51) does not contact the shaped channel I when passing through the shaped channel I; and the lower convex portion (52) does not contact the shaped channel II when passing through the shaped channel II.

2. The special-shaped necking mold according to claim 1, characterized in that: Four workpiece positioning members (8) are arranged on the periphery of the bottom plate connecting frame (10) and are symmetrically distributed at four corners, the bottom of the workpiece positioning member (8) is fixedly connected to the lower mold base assembly, and the top of the workpiece positioning member (8) is flush with the upper surface of the upper bottom plate (9); The workpiece positioning member (8) is provided with a transverse channel corresponding to the lower end positioning push block (11).

3. The special-shaped necking mold according to claim 2, characterized in that: The lower mold base assembly comprises a lower bottom plate (12), a lower pad (13) and a lower back plate (14) which are fixedly connected in sequence from top to bottom, and the lower bottom plate (12), the lower pad (13) and the lower back plate (14) are provided with intersecting special-shaped channels II; A bottom plate connecting frame (10) is fixedly arranged on the upper surface of the bottom plate (12) at the lower end; A lower mold elastic member (15) mounted on the upper surface of the lower back plate (14) passes through the lower pad (13) and the lower end bottom plate (12) in sequence, and the top end of the lower mold elastic member (15) abuts against the bottom surface (54) of the inner cavity; The bottom of the workpiece positioning member (8) is fixedly connected to the upper surface of the lower pad (13); Four sets of lower elastic components are arranged on the upper surface of the lower end bottom plate (12) and are symmetrically distributed in four corners.

4. The special-shaped necking mold according to claim 3 is characterized in that: The cross-section of the lower back plate (14), the cross-section of the lower pad (13), and the cross-section of the lower end bottom plate (12) are reduced in sequence.

5. The special-shaped necking mold according to any one of claims 1 to 4, characterized in that: An upper mold pressing block (3) is fixedly arranged at the center of the bottom surface (23) of the inner cavity of the female mold (2), and the cross section of the upper mold pressing block (3) is smaller than the bottom surface (23) of the inner cavity of the female mold (2); An upper back plate (1) fixedly connected to the concave die (2) is arranged above the concave die (2).

6. The special-shaped necking mold according to claim 5, characterized in that: Channel III coincides with the frame of the push block insert (5).

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