CN117299955A - Center pillar inner plate flanging die and production process thereof - Google Patents

Abstract

The invention relates to the technical field of stamping dies of automobile parts, in particular to a flanging die of a center pillar inner plate and a production process thereof, comprising the following steps: the bottom die is used for installing and assembling the die; a top die for mounting the shaping die; further comprises: the matched die adopts a split design; the shaping mold comprises a shaping inner mold, and a shaping outer mold is fixedly arranged on the outer side of the shaping inner mold; and the cutting assembly can be matched with the outer die to cut materials. According to the invention, the cutting assembly is arranged to be matched with the outer die, so that the material can be cut, the cutting step is completed during punching, the processing flow is reduced, and the production efficiency is improved; according to the invention, the matched die and the shaping die are arranged, and the matched die adopts a split design, so that multiple flanging can be completed by single stamping, the stamping times are reduced, the rapid forming is realized, the production efficiency is improved, the stamping times are reduced, the stamping precision is improved, and the yield is improved.

Description

Center pillar inner plate flanging die and production process thereof

Technical Field

The invention relates to the technical field of stamping dies for automobile parts, in particular to a flanging die for a center pillar inner plate and a production process thereof.

Background

The middle column refers to an automobile B column, and the inner plate of the middle column refers to a reinforcing plate in the B column. The B-pillar is arranged between the front seat and the rear seat of the cockpit, namely the longitudinal lever between two doors at two sides, and extends from the roof to the bottom of the automobile, and the safety belt is arranged on the B-pillar when seen from the inner side. The B column is an important reinforcing and supporting part of the automobile, and the inner plate of the middle column is a key part for bearing the B column.

The existing inner plate is produced by stamping. The shape of the inner plate is complex, a plurality of dies are adopted to punch to sequentially deepen the stamping depth and gradually form, so that the stamping difficulty is reduced, but the stamping of a plurality of dies is low in efficiency, parts are repositioned among different procedures, the machining precision of the parts is reduced, and the yield is influenced.

In view of this, we propose a pillar inner panel flanging die and a production process thereof.

Disclosure of Invention

In order to overcome the defects of low efficiency and low yield caused by multi-die stamping in the prior art, the invention provides a center pillar inner plate flanging die and a production process thereof.

The technical scheme of the invention is as follows:

a middle column inner plate flanging die and a production process thereof comprise the following steps:

the bottom die is arranged on a workbench of the punching machine and used for installing and closing the die, and comprises a bottom die fixing plate, and a matched die installation frame is fixedly arranged above the bottom die fixing plate;

the top die is arranged below the stamping machine moving part and used for installing the sizing die and driving the sizing die to move, and comprises a top die fixing plate, and a sizing die installation frame is fixedly arranged below the top die fixing plate;

further comprises:

the matched die adopts a split type design and comprises an inner die, an intermediate die and an outer die, wherein the inner die, the intermediate die and the outer die can slide relatively, and the intermediate die and the outer die are used for flanging materials in cooperation with the shaping die;

the shaping die comprises a shaping inner die, a shaping outer die is fixedly arranged on the outer side of the shaping inner die, and bending chamfers are arranged on the outer sides of the shaping inner die and the shaping outer die;

the cutting assembly is fixedly arranged on the inner side of the setting die mounting frame and is positioned on the outer side of the setting outer die, the setting outer die and the cutting assembly can slide, and the cutting assembly can be matched with the outer die to cut materials.

As the preferable technical scheme of the invention, the middle part of the bottom die fixing plate is provided with a mounting hole in a penetrating way, a plurality of first gas springs are fixedly arranged in the mounting hole, and the bottom of the matched die is propped against the top end of a piston rod of the first gas springs.

As the preferable technical scheme of the invention, the piston rods of the first gas springs are different in length, the piston rod of the first gas spring in contact with the bottom surface of the inner die is longest, the piston rod of the first gas spring in contact with the bottom surface of the middle die is slightly shorter, and the piston rod of the first gas spring in contact with the bottom surface of the outer die is shortest.

As a preferable technical scheme of the invention, a plurality of second mounting holes are formed in the middle of the top die fixing plate in a penetrating manner, second gas springs are fixedly mounted in the second mounting holes, and the bottom surface of the shaping die abuts against the end face of a piston rod of each second gas spring.

As the preferable technical scheme of the invention, an inner die sliding block is fixedly arranged on the outer side of the inner die, an inner die sliding groove is arranged on one side, close to the inner die, of the middle die, and the inner die sliding block can slide in the inner die sliding groove.

As the preferable technical scheme of the invention, the outer side of the middle die is fixedly provided with a middle die sliding block, one side of the outer die, which is close to the middle die sliding block, is provided with a middle die sliding groove, the middle die sliding block can slide in the middle die sliding groove, and the outer side of the outer die is fixedly provided with an outer die sliding block.

As the preferable technical scheme of the invention, the surface of the shaping inner die, which is contacted with the shaping die mounting frame, is fixedly provided with the shaping inner die sliding block.

As the preferable technical scheme of the invention, the surface of the shaping outer die, which is contacted with the cutting assembly, is fixedly provided with a shaping outer die sliding block.

As the preferable technical scheme of the invention, the cutting assembly comprises a middle cutting block and an end cutting block, wherein the middle cutting block and the end cutting block are respectively provided with a shaping outer die sliding groove and an end shaping die sliding groove, and the shaping outer die sliding groove and the end shaping die sliding groove are matched with the shaping outer die sliding block.

As the preferable technical scheme of the invention, the production process of the flanging die of the inner plate of the middle column comprises the following steps:

s1: the top surface widths of an inner die, an intermediate die and an outer die are respectively determined according to the size of a workpiece to be produced, a rough blank is machined by using a whole piece of metal through cutting, then finish machining is performed, and an inner die sliding block, an intermediate die sliding block and an outer die sliding block are installed after finish machining;

s2: determining the inner size of a matched die mounting frame according to the sizes of the machined inner die, middle die and outer die, and machining by adopting a whole piece of metal;

s3: determining the number, the size and the placement position of the first gas springs according to the sizes of the inner die, the middle die and the outer die, cutting a bottom die fixing plate by adopting a whole metal according to the number, the size and the placement position of the first gas springs, and drilling and processing a mounting hole;

s4: determining the sizes of a shaping inner die and a shaping outer die according to the size of a workpiece to be produced, adopting whole metal cutting processing, determining the radius of a bending chamfer according to the flanging size, and installing a shaping inner die sliding block and a shaping outer die sliding block after finish machining;

s5: determining the size of a cutting assembly according to the size of the shaping die, adopting cutting processing, and cutting and processing a shaping outer die chute and an end shaping die chute according to the shaping inner die slide block and the shaping outer die slide block;

s6: cutting a whole metal according to the sizes of the shaping die and the cutting assembly to obtain a shaping die mounting frame;

s7: and the size of the sizing die determines the number, the size and the placement position of the second gas springs, and the size of the mounting frame of the sizing die is matched according to the data, and the whole metal is adopted to process the top die fixing plate.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the cutting assembly is arranged to be matched with the outer die, so that the material can be cut, the cutting step is completed during punching, the processing flow is reduced, and the production efficiency is improved;

2. according to the invention, the matched die and the shaping die are arranged, and the matched die adopts a split design, so that multiple flanging can be completed by single stamping, the stamping times are reduced, the production efficiency is improved, the stamping times are reduced, the stamping precision is improved, and the yield is improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of the bottom die structure in the present invention;

FIG. 3 is an exploded view of the bottom mold structure of the present invention;

FIG. 4 is an exploded view of the top mold structure of the present invention;

FIG. 5 is a schematic view of a mating mold structure according to the present invention;

FIG. 6 is an exploded view of a mating die structure of the present invention;

FIG. 7 is a schematic diagram showing the assembly of a shaping mold structure in the present invention;

FIG. 8 is a schematic view of a shaping mold according to the present invention;

FIG. 9 is an exploded view of the forming die according to the present invention.

The significance of each punctuation mark in the figure is as follows:

1. a bottom die; 11. a bottom die fixing plate; 12. a mounting hole; 13. a first gas spring; 14. matching a die mounting frame; 15. matching with a die chute; 16. matching a die limiting plate; 17. an anti-collision rod; 18. a guide hole; 19. a material guiding slope;

2. a top mold; 21. a top mold fixing plate; 22. a second mounting hole; 23. a second gas spring; 24. a setting die mounting frame; 25. a shaping die chute; 26. a shaping die limiting plate; 27. a guide rod;

3. matching a die; 31. an inner mold; 32. a material positioning block; 33. an inner mold slide block; 34. an intermediate mold; 35. an inner mold chute; 36. a middle mold slide block; 37. an outer mold; 38. a middle die chute; 39. an outer mold slide block;

4. forming die; 41. shaping an inner mold; 42. shaping an inner mold sliding block; 43. shaping an outer mold; 44. shaping steps; 45. shaping an outer mold sliding block; 46. bending and chamfering;

5. cutting the component; 51. a middle cutting block; 52. shaping an outer die chute; 53. cutting end parts; 54. an end shaping die chute.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1-9, the present invention is described in detail by the following embodiments:

a middle column inner plate flanging die and a production process thereof comprise the following steps:

the die block 1 is fixedly arranged on a workbench of the punching machine and used for installing the die assembly 3, the die block 1 comprises a die block fixing plate 11, and a die assembly installing frame 14 is fixedly arranged above the die block fixing plate 11. The middle part of the bottom die fixing plate 11 is penetrated and provided with a mounting hole 12, and a plurality of first gas springs 13 are fixedly arranged in the mounting hole 12 through screws.

The press is a well-known press apparatus, the first gas spring 13 is a nitrogen spring, and the first gas spring 13 is used to support the mating die 3. Guide holes 18 are arranged at four corners of the bottom die fixing plate 11.

The matched die mounting frame 14 is fixedly mounted on the top surface of the bottom die fixing plate 11 through screws, a matched die sliding groove 15 is formed in the inner side of the matched die mounting frame 14, a matched die limiting plate 16 is fixedly mounted on the top of the matched die sliding groove 15 and located on the top surface of the matched die mounting frame 14 through screws, the matched die 3 can slide in the matched die sliding groove 15, the matched die limiting plate 16 is used for limiting the sliding distance of the matched die 3, an anti-collision rod 17 is fixedly mounted on the top surface of the matched die mounting frame 14, and a guide slope 19 is arranged at the edge of the matched die mounting frame 14.

The top of the bumper 17 is made of rubber material. Guide holes 18 are formed in four corners of the matching die mounting frame 14 in a penetrating manner, and the guide holes 18 on the matching die mounting frame 14 are aligned with the guide holes 18 on the bottom die fixing plate 11.

The top die 2, top die 2 installs in punching machine moving part below for install stock die 4 and drive stock die 4 motion, top die 2 includes top die fixed plate 21, and top die fixed plate 21 below is through bolt fixed mounting stock die installing frame 24. The middle part of the top die fixing plate 21 is provided with a plurality of second mounting holes 22 in a penetrating way, second gas springs 23 are fixedly mounted in the second mounting holes 22 through screws, and the bottom surface of the shaping die 4 abuts against the end face of a piston rod of each second gas spring 23.

Guide rods 27 are fixedly arranged below the four corners of the setting die mounting frame 24, the guide rods 27 are matched with the guide holes 18, and the bottoms of the guide rods 27 are inserted into the guide holes 18 and can slide in the guide holes 18. The second gas spring 23 is a nitrogen spring.

The shaping die installation frame 24 inboard is equipped with shaping die spout 25, and shaping die limit plate 26 is fixed mounting through the screw to shaping die spout 25 bottom and be located shaping die installation frame 24 bottom surface. The shaping die 4 can slide along the shaping die sliding groove 25, and the shaping die limiting plate 26 is used for limiting the sliding distance of the shaping die 4.

The bottom surface of the sizing die limiting plate 26 is flush with the bottom surface of the sizing die mounting frame 24. The punch moving part can drive the top die 2 to move, when the top die 2 moves to the lowest position, the top surface of the sizing die mounting frame 24 is contacted with the top surface of the anti-collision rod 17, the anti-collision rod 17 can limit the sizing die mounting frame 24 to move continuously, and the sizing die mounting frame 24 is placed to be in collision fit with the die mounting frame 14.

Further comprises:

the matched die 3 is in split type design, the matched die 3 comprises an inner die 31, an intermediate die 34 and an outer die 37, the inner die 31, the intermediate die 34 and the outer die 37 can slide relatively, the intermediate die 34 and the outer die 37 are used for being matched with the shaping die 4 to turn over the material, and the bottom of the matched die 3 is propped against the top end of a piston rod of the first gas spring 13.

The piston rods of the first gas springs 13 are different in length, the piston rod of the first gas spring 13 in contact with the bottom surface of the inner die 31 is longest, the piston rod of the first gas spring 13 in contact with the bottom surface of the middle die 34 is slightly shorter, and the piston rod of the first gas spring 13 in contact with the bottom surface of the outer die 37 is shortest. The length of the piston rod determines the travel of the matched die 3, when the top die 2 moves downwards under the drive of a punching machine moving part, the top die 2 drives the fixed die 4 to move downwards, the fixed die 4 can prop against the matched die 3 to move downwards, the first gas spring 13 can be compressed at the moment, when the first gas spring 13 cannot continue to be compressed, the fixed die 4 can prop against the second gas spring 23 to move upwards, when the top die 2 moves upwards under the drive of the punching machine moving part, the fixed die 4 has a trend of being far away from the matched die 3, the pressure born by the second gas spring 23 is reduced, the fixed die 4 can prop against, the top die 2 continues to move upwards, the fixed die 4 is blocked when moving to the fixed die limiting plate 26, the top die 2 continues to move upwards at the moment, the pressure born by the first gas spring 13 is reduced, the fixed die 3 is propped against the matched die 3 to move upwards, and the matched die 3 is blocked when moving to the die limiting plate 16.

The heights of the inner die 31, the intermediate die 34 and the outer die 37 are sequentially reduced, and the height difference between the inner die 31, the intermediate die 34 and the outer die 37 is equal to twice the height of the turned-up edge of the workpiece. When the press is not performed, the inner die 31 is highest, the intermediate die 34 and the outer die 37 are successively lowered, and when the press is performed, the inner die 31 is highest and the intermediate die 34 and the outer die 37 are successively raised.

The two sides of the top of the inner mold 31 are fixedly provided with material positioning blocks 32, and the material positioning blocks 32 are used for positioning the punched materials.

An inner mold sliding block 33 is fixedly arranged on the outer side of the inner mold 31 through a screw, an inner mold sliding groove 35 is formed in one side, close to the inner mold 31, of the middle mold 34, and the inner mold sliding block 33 can slide in the inner mold sliding groove 35. The middle die 34 is fixedly provided with a middle die sliding block 36 on the outer side through a screw, a middle die sliding groove 38 is arranged on one side of the outer die 37 close to the middle die sliding block 36, the middle die sliding block 36 can slide in the middle die sliding groove 38, and the outer side of the outer die 37 is fixedly provided with an outer die sliding block 39 through the screw.

The use of self-lubricating slides for the inner mold slide 33, the intermediate mold slide 36, and the outer mold slide 39 can improve the service life of the mating mold 3 and the smoothness of sliding. When the inner mold 31, the intermediate mold 34 and the outer mold 37 are lifted to the highest position, the inner mold slide blocks 33 and the outer mold slide blocks 39 on the left and right sides of the inner mold 31 are abutted against the bottom surface of the matched mold limiting plate 16. The inner mold slide 33 positioned in the inner mold slide groove 35 abuts against the inner top surface of the inner mold slide groove 35, and the top end of the intermediate mold slide 36 positioned in the intermediate mold slide groove 38 abuts against the inner top surface of the intermediate mold slide groove 38.

The shaping die 4, the shaping die 4 includes shaping internal die 41, shaping external die 43 is fixed on the outer side of shaping internal die 41 through bolts, and bending chamfer 46 is arranged on the outer sides of shaping internal die 41 and shaping external die 43.

The radius of the bend chamfer 46 is related to the thickness of the workpiece.

The top of the shaping outer die 43 is provided with a shaping step 44, and the shaping step 44 is matched with the middle die 34 and the outer die 37. When the top die 2 moves downwards under the drive of the punch moving part, the top die 2 drives the shaping die 4 to move downwards, the bottom surface of the shaping inner die 41 is contacted with the top surface of the inner die 31, and under the elastic force of the second air spring 23 and the first air spring 13, the bottom surface of the shaping inner die 41 can clamp materials with the inner die 31, so that the displacement of the materials is prevented. The shaping die 4 continues to move downwards, the shaping inner die 41 props against the inner die 31 to drive the inner die 31 to move downwards until the bottom surface of the material contacts the top surface of the middle die 34, a shearing force is generated between the edge of the shaping inner die 41 and the top surface of the middle die 34, the material can be bent due to the bending chamfer 46, at this time, the shaping die 4 continues to move downwards, the shaping outer die 43 is matched with the middle die 34 to clamp the material, the middle die 34 is pressed down, the material can be bent for the second time, and the shaping step 44 is matched with the middle die 34 and the outer die 37 to clamp the material, so that flanging of the material is completed.

A shaping inner die slider 42 is fixedly mounted on the surface of the shaping inner die 41 in contact with the shaping die mounting frame 24. The surface of the shaping outer die 43 contacted with the cutting assembly 5 is fixedly provided with a shaping outer die sliding block 45.

The shaping inner mold slide block 42 and the shaping outer mold slide block 45 adopt self-lubricating slide blocks.

The cutting assembly 5 is fixedly arranged on the inner side of the setting die mounting frame 24 and is positioned on the outer side of the setting outer die 43, the setting outer die 43 and the cutting assembly 5 can slide, and the cutting assembly 5 can be matched with the outer die 37 to cut materials. The cutting assembly 5 comprises a middle cutting block 51 and an end cutting block 53, wherein the middle cutting block 51 and the end cutting block 53 are respectively provided with a shaping outer die sliding groove 52 and an end shaping die sliding groove 54, and the shaping outer die sliding groove 52 and the end shaping die sliding groove 54 are matched with the shaping outer die sliding block 45.

When the shaping inner die 41 and the shaping outer die 43 are at the lowest points, the shaping outer die sliding block 45 is positioned in the shaping outer die sliding groove 52 and the end shaping die sliding groove 54, and the bottom surfaces of the shaping outer die sliding blocks 45 are propped against the inner bottom surfaces of the shaping outer die sliding groove 52 and the end shaping die sliding groove 54. The bottom surface of the shaping inner die slide block 42 abuts against the upper surface of the shaping die limiting plate 26.

After the bottom surface of the matched die 3 is propped against the upper surface of the bottom die fixing plate 11, the top die 2 continues to move downwards, the cutting assembly 5 is in contact with the material at the moment, the middle cutting block 51 and the end cutting block 53 are in epitaxial fit with the outer die 37 to apply shearing force to the material, the material is cut until the upper surface of the fixed die 4 is in contact with the lower surface of the top die fixing plate 21, the bottom surface of the fixed die mounting frame 24 is in contact with the anti-collision rod 17 at the moment, the top die 2 stops moving, and the sheared material can slide out of the guide slope 19. And (5) finishing stamping.

When the equipment is used by operators, the stamping materials are placed on the top surface of the inner die 31, the materials are positioned through the material positioning blocks 32, the top die 2 is lowered, and the top die 2 drives the shaping die 4 to move downwards.

The bottom surface of the shaping inner die 41 is contacted with the top surface of the inner die 31 firstly, and under the action of the elasticity of the second air spring 23 and the first air spring 13, the bottom surface of the shaping inner die 41 and the inner die 31 can clamp materials firstly, so that the displacement of the materials is prevented.

The shaping die 4 continues to move downwards, the shaping inner die 41 props against the inner die 31 to drive the inner die 31 to move downwards until the bottom surface of the material contacts the top surface of the middle die 34, a shearing force is generated between the edge of the shaping inner die 41 and the top surface of the middle die 34, the material can be bent due to the bending chamfer 46, at this time, the shaping die 4 continues to move downwards, the shaping outer die 43 is matched with the middle die 34 to clamp the material, the middle die 34 is pressed down, the material can be bent for the second time, and the shaping step 44 is matched with the middle die 34 and the outer die 37 to clamp the material, so that flanging of the material is completed.

At this time, the shaping mold 4 continuously moves downwards against the matched mold 3, after the bottom surface of the matched mold 3 abuts against the upper surface of the bottom mold fixing plate 11, the top mold 2 continuously moves downwards, at this time, the cutting assembly 5 contacts with the material, the middle cutting block 51 and the end cutting block 53 are in extension with the outer mold 37 to apply shearing force to the material, the material is cut until the upper surface of the shaping mold 4 contacts with the lower surface of the top mold fixing plate 21, at this time, the bottom surface of the shaping mold mounting frame 24 contacts with the anti-collision rod 17, the top mold 2 stops moving, and the cut material slides out from the guide slope 19. And (5) finishing stamping.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. Center pillar inner panel turn-ups mould includes:

the die block (1), the die block (1) is installed on a workbench of a punching machine and used for installing a die (3), the die block (1) comprises a die block fixing plate (11), and a die matching die installation frame (14) is fixedly installed above the die block fixing plate (11);

the top die (2) is arranged below a moving part of the punching machine and used for installing the sizing die (4) and driving the sizing die (4) to move, the top die (2) comprises a top die fixing plate (21), and a sizing die installation frame (24) is fixedly arranged below the top die fixing plate (21);

characterized by further comprising:

the matched die (3) is in split type design, and comprises an inner die (31), an intermediate die (34) and an outer die (37), wherein the inner die (31), the intermediate die (34) and the outer die (37) can slide relatively, and the intermediate die (34) and the outer die (37) are used for flanging materials in cooperation with the shaping die (4);

the shaping mold (4), wherein the shaping mold (4) comprises a shaping inner mold (41), a shaping outer mold (43) is fixedly arranged on the outer side of the shaping inner mold (41), and bending chamfers (46) are arranged outside the shaping inner mold (41) and the shaping outer mold (43);

the cutting assembly (5), cutting assembly (5) fixed mounting is inboard at stock mould installing frame (24) and is located the shaping external mold (43) outside, shaping external mold (43) and cutting assembly (5) between slidable, cutting assembly (5) can cooperate external mold (37) to tailor the material.

2. The center pillar inner panel flanging die as set forth in claim 1, wherein: the middle part of the bottom die fixing plate (11) is penetrated and provided with a mounting hole (12), a plurality of first gas springs (13) are fixedly mounted in the mounting hole (12), and the bottom of the matched die (3) is propped against the top end of a piston rod of the first gas springs (13).

3. The center pillar inner panel flanging die as recited in claim 2, wherein: the piston rods of the first gas springs (13) are different in length, the piston rod of the first gas spring (13) in contact with the bottom surface of the inner die (31) is longest, the piston rod of the first gas spring (13) in contact with the bottom surface of the middle die (34) is slightly shorter, and the piston rod of the first gas spring (13) in contact with the bottom surface of the outer die (37) is shortest.

4. The center pillar inner panel flanging die as set forth in claim 1, wherein: the middle part of the top die fixing plate (21) is penetrated and provided with a plurality of second mounting holes (22), a second gas spring (23) is fixedly mounted in the second mounting holes (22), and the bottom surface of the shaping die (4) abuts against the end surface of a piston rod of the second gas spring (23).

5. A center pillar inner panel flanging die as set forth in claim 3, wherein: an inner die sliding block (33) is fixedly arranged on the outer side of the inner die (31), an inner die sliding groove (35) is formed in one side, close to the inner die (31), of the middle die (34), and the inner die sliding block (33) can slide in the inner die sliding groove (35).

6. A center pillar inner panel flanging die as recited in claim 5, wherein: the middle die (34) outside fixed mounting has middle die slide (36), outer die (37) are close to middle die slide (36) one side and are equipped with middle die spout (38), middle die slide (36) can slide in middle die spout (38), outer die (37) outside fixed mounting has outer die slide (39).

7. The center pillar inner panel flanging die as set forth in claim 1, wherein: and a shaping inner die sliding block (42) is fixedly arranged on the surface, which is contacted with the shaping die mounting frame (24), of the shaping inner die (41).

8. The center pillar inner panel flanging die as set forth in claim 1, wherein: and a shaping outer die sliding block (45) is fixedly arranged on the surface, which is contacted with the cutting assembly (5), of the shaping outer die (43).

9. The center pillar inner panel flanging die as recited in claim 8, wherein: the cutting assembly (5) comprises a middle cutting block (51) and an end cutting block (53), wherein a shaping outer die sliding groove (52) and an end shaping die sliding groove (54) are respectively arranged on the middle cutting block (51) and the end cutting block (53), and the shaping outer die sliding groove (52) and the end shaping die sliding groove (54) are matched with the shaping outer die sliding block (45).

10. The production process of the flanging die for the inner plate of the middle column is characterized by comprising the following steps of: the method comprises the following steps:

s1: the top surface widths of an inner die (31), an intermediate die (34) and an outer die (37) are respectively determined according to the size of a workpiece to be produced, a rough blank is machined by using a whole piece of metal through cutting, then finish machining is carried out, and an inner die sliding block (33), an intermediate die sliding block (36) and an outer die sliding block (39) are arranged after finish machining;

s2: determining the inner size of the matched die mounting frame (14) according to the sizes of the machined inner die (31), middle die (34) and outer die (37), and machining by adopting a whole piece of metal;

s3: determining the number, the size and the placement position of the first gas springs (13) according to the sizes of the inner die (31), the middle die (34) and the outer die (37), cutting a die block fixing plate (11) by adopting a whole metal according to the number, the size and the placement position of the first gas springs (13), and drilling a mounting hole (13);

s4: the method comprises the steps of determining the sizes of a shaping inner die (41) and a shaping outer die (43) according to the size of a workpiece to be produced, adopting a whole metal cutting process, determining the radius of a bending chamfer (46) according to the flanging size, and installing a shaping inner die sliding block (42) and a shaping outer die sliding block (45) after finish machining;

s5: determining the size of a cutting assembly (5) according to the size of a sizing die (4), adopting cutting processing, and cutting and processing a sizing outer die sliding groove (52) and an end sizing die sliding groove (54) according to a sizing inner die sliding block (42) and a sizing outer die sliding block (45);

s6: cutting a whole metal according to the sizes of the sizing die (4) and the cutting assembly (5) to manufacture a sizing die mounting frame (24);

s7: the size of the sizing die (4) determines the number, the size and the placement position of the second gas springs (23), and the size of the sizing die mounting frame (24) is matched according to the data, and the whole piece of metal is adopted to process the top die fixing plate (21).