Bending and stamping device for buckle in fuel tank chuck

Abstract

The invention discloses a fuel tank chuck inner buckle bending and stamping device in the field of fuel tank chuck machining, which comprises an upper die holder and a lower die holder which correspond to each other, a stripper plate is arranged between the upper die holder and the lower die holder, and a plurality of nitrogen springs are arranged on the lower side of the upper die holder corresponding to the stripper plate. The lower die base is provided with a lower fixing plate, the lower fixing plate is provided with a plurality of sets of sliding forming lower dies which are arranged at intervals in the circumferential direction and can move in the radial direction, and the lower side of the upper die base is provided with a driving fixing plate. A plurality of sets of upper die assemblies which are arranged at intervals in the circumferential direction are arranged on the driving fixing plate and correspond to the sliding forming lower dies, and a plurality of profiling material pressing components which are arranged at intervals in the circumferential direction are arranged on the discharging plate and correspond to the sliding forming lower dies. According to the invention, the bending edge punched by the chuck is perfectly separated from the die, and the production capacity is stable.

Description

Technical Field

[0001] The invention belongs to the field of fuel tank chuck processing, and in particular relates to a buckle bending and punching device inside a fuel tank chuck. Background Art

[0002] Most of the fuel tanks of automobiles are made of plastic. In order to install the oil pump or other control valve parts, they need to be partially strengthened. Therefore, a fuel tank chuck insert is used. This insert is made by punching a metal sheet. Its main structure includes a disc-shaped annular body with a center hole punched through the body, and the outer periphery of the annular body is provided with a plurality of circumferentially spaced bent edges.

[0003] At present, the fuel tank chuck is generally manufactured by punching with a progressive die. The feeding mechanism drives the material strip to move backward, and the punching machine moves to perform multi-station continuous punching on the material strip between the upper die and the lower die, thereby processing the fuel tank chuck.

[0004] When the punch press mold is punching the bent edge of the chuck, it is easy to cause the problem that the part is inverted in the mold after the bending process and is difficult to remove from the mold. In the prior art, there is also a solution to use a slider structure to remove the part, but there are still the following problems: 1. The slider is affected by the closing height of the mold and the size is not stable enough; 2. When the reset spring of the slider becomes weak, there is no forced reset, and there is a risk of mold explosion. Summary of the invention

[0005] The purpose of the present invention is to provide a buckle bending and stamping device for a fuel tank chuck, which can solve the problem that the stamped part cannot be removed from the mold after bending, perfectly realize the removal of the bent edge punched by the chuck from the mold, and have stable production capacity.

[0006] The objective of the present invention is achieved as follows: a buckle bending and punching device for a fuel tank chuck comprises an upper die seat and a lower die seat corresponding to each other, a stripping plate is arranged between the upper die seat and the lower die seat, a plurality of nitrogen springs are arranged on the lower side of the upper die seat corresponding to the stripping plate, the lower end of each nitrogen spring elastically abuts against the upper side of the stripping plate, a lower fixed plate is arranged on the lower die seat, a plurality of groups of sliding forming lower dies which are arranged at intervals along the circumferential direction and can move radially are arranged on the lower fixed plate, a driving fixed plate is arranged on the lower side of the upper die seat, a plurality of groups of upper die assemblies which are arranged at intervals along the circumferential direction corresponding to each sliding forming lower die are arranged on the driving fixed plate, a plurality of profiling pressing parts which are arranged at intervals along the circumferential direction corresponding to each sliding forming lower die are arranged on the stripping plate, and each profiling pressing part is arranged in one-to-one correspondence with each group of upper die assemblies.

[0007] The upper die and the lower die of the present invention serve as a bending and stamping station of the progressive die, and the corresponding progressive die on the punch press is equipped with a floating mechanism. The feeding mechanism drives the material strip to move backward, and the chuck workpiece to be bent and stamped is connected to the bending and stamping station of the material strip (the chuck workpiece is a part of the material strip and has not yet been subjected to the last stamping station of the progressive die, so the chuck workpiece has not yet been separated from the material strip). The floating mechanism can lift the entire material strip and the chuck workpiece on the material strip; the upper die base and the lower die base of the present invention are installed on the punch press, and the punch press slider drives the upper die base to perform up and down reciprocating lifting and lowering movements. The stripping plate of the present invention is vertically provided with a plurality of stripping sleeves, the upper end of each stripping sleeve passes through the upper die seat and the outer periphery of the protruding end of the stripping sleeve is provided with a limiting step, the stripping plate is fixed with a plurality of guide pillars, each guide pillar passes through the corresponding stripping plate and is perpendicular to the stripping plate, and a guide sleeve is provided at the upper and lower ends of each guide pillar on the upper die seat and the lower die seat respectively, and the two ends of the guide pillar are movably connected with the corresponding upper and lower guide sleeves respectively; when the upper die seat is at the highest point, the nitrogen spring presses the stripping plate downward so that the distance between the stripping plate and the upper die seat is the maximum. During the bending and stamping operation, the contour pressing component presses the annular chuck workpiece, drives the reset upper die to cooperate with the sliding forming lower die, so that the sliding forming lower die positions the lower side of the L-shaped part to be bent of the chuck workpiece, and the upper die bending punch punches the L-shaped part to be bent into a U shape; after the stamping is completed, the upper die assembly rises, drives the reset upper die to cooperate with the sliding forming lower die, so that the sliding forming lower die is separated from the U-shaped part to be bent. Compared with the prior art, the beneficial effects of the present invention are: it can solve the problem that the stamped parts cannot be removed from the mold after bending, perfectly realize the removal of the bent edge punched by the chuck from the mold, and can have a stable production capacity.

[0008] As a further improvement of the present invention, the stripper plate, the upper die base and the lower die base are all arranged horizontally, and the nitrogen spring is arranged vertically.

[0009] As a further improvement of the present invention, each of the sliding forming lower dies is evenly arranged along the circumferential direction, and a sliding guide rail is correspondingly arranged on both sides of the circumferential edge of each sliding forming lower die on the lower fixed plate, and the sliding forming lower die is movably connected to the corresponding two circumferentially adjacent sliding guide rails, and each sliding forming lower die and each sliding guide rail are staggered in sequence along the circumferential direction. The sliding guide rail guides the radial movement of the sliding forming lower die.

[0010] As a further improvement of the present invention, a slide groove is radially provided on the lower fixed plate corresponding to each sliding forming lower die, a travel limit pin extending downward into the corresponding slide groove is vertically fixed on the sliding forming lower die, the travel limit pin is in contact with the inner wall of the inner end of the slide groove, a reset drive spring is radially provided between the travel limit pin and the inner wall of the outer end of the corresponding slide groove, and a lower template is fixed on the upper side of the lower fixed plate. After the sliding forming lower die moves radially outward, the reset drive spring can reset the sliding forming lower die, and an installation groove for installing each sliding forming lower die is provided in the middle of the lower template, and a spacing is left between the inner wall of the installation groove and the outer periphery of the sliding forming lower die to prevent interference when the upper die bending punch bends the portion to be bent.

[0011] As a further improvement of the present invention, an annular chuck workpiece to be bent and punched is arranged between each of the upper die assemblies, the profiling pressing parts and the sliding forming lower die below, the outer periphery of the chuck workpiece is provided with a plurality of L-shaped portions to be bent evenly distributed along the circumferential direction, an arc-shaped transition portion is provided between the portions to be bent and the chuck workpiece, an annular avoidance groove is provided at the bottom of the discharge plate corresponding to the chuck workpiece, a plurality of embedding grooves are provided on the discharge plate corresponding to each profiling pressing part, each embedding groove is located above the avoidance groove, each profiling pressing part is respectively embedded in the corresponding embedding groove, and the profiling pressing part is respectively embedded in the corresponding embedding groove. A pressing groove is provided at the lower part of the profiling pressing part, and a horizontal pressing surface 1 and an arc-shaped pressing surface 2 are provided on the inner wall of the pressing groove. After the chuck workpiece enters the avoidance groove, the pressing surface 1 and the pressing surface 2 correspond to the upper end and the outer periphery of the annular chuck workpiece, and the horizontal section of the L-shaped portion to be bent fits with the lower surface of the stripper plate; the upper die assembly includes a driving reset upper die and an upper die bending punch, which are respectively located at the inner side and the outer side of the corresponding profiling pressing part in the radial direction, and a plurality of through holes are provided on the stripper plate corresponding to each driving reset upper die and the upper die bending punch. When the chuck workpiece enters the avoidance groove, the pressing surface 1 and the pressing surface 2 of the profiling pressing part press the upper end and the outer periphery of the annular chuck workpiece, respectively, and the driving reset upper die and the upper die bending punch can move downward through the stripper plate.

[0012] As a further improvement of the present invention, the driven reset upper die and the upper die bending punch are both arranged vertically, the cross-section of the driven reset upper die is rectangular, a functional groove is opened on the outer side of the lower part of the driven reset upper die, and a forced reset part is provided on the inner side of the lower part of the driven reset upper die. The height of the functional groove is greater than the height of the forced reset part. The inner wall of the functional groove of the driven reset upper die is provided with a vertical first pushing surface and an inclined second pushing surface, an arc-shaped connecting surface is provided between the first pushing surface and the bottom surface of the driven reset upper die, an arc-shaped connecting surface is provided between the first pushing surface and the second pushing surface, an arc-shaped connecting surface is provided between the second pushing surface and the outer side surface of the driven reset upper die, the bottom surface of the forced reset part is flush with the bottom surface of the driven reset upper die, and a reset pushing surface is also inclined on the forced reset part, an arc-shaped connecting surface is provided between the reset pushing surface and the bottom surface of the forced reset part, and an arc-shaped connecting surface is provided between the reset pushing surface and the inner side surface of the driven reset upper die. By driving the reset upper die to be inserted into the stroke groove and cooperate with the sliding forming lower die, the sliding forming lower die is driven to move outward to compress the reset driving spring, and the sliding forming lower die can be forced to reset. The arc-shaped connecting surface of the reset upper die is driven to contact the inner wall of the stroke groove of the sliding forming lower die. The arc-shaped flexible contact drive is smoother, avoiding direct hard contact collision.

[0013] As a further improvement of the present invention, a travel groove is provided on the sliding forming lower die corresponding to the driven reset upper die, the travel groove includes a main groove and an upper avoidance groove and a lower reset groove located on the inner side of the main groove, an inner inner wall of the travel groove is vertically provided with an inner limit surface, and the outer inner wall of the travel groove is respectively provided with an inclined upper push surface located above and a vertical lower push surface located below, the upper push surface and the lower push surface are arranged corresponding to the functional groove, the lower reset groove is arranged corresponding to the forced reset part, the spacing between the inner and outer side surfaces of the driven reset upper die is arranged corresponding to the spacing between the inner limit surface and the lower push surface of the travel groove, and the outer side of the sliding forming lower die is provided with a bending groove for accommodating the bending part to enter. An arc-shaped connecting surface is provided between the inner wall of the upper avoidance groove and the inner limit surface, an arc-shaped connecting surface is provided between the inner limit surface and the inner wall of the lower reset groove, and an arc-shaped connecting surface is provided between the upper push surface and the lower push surface; when the upper die seat moves downward, the first pushing surface and the second pushing surface of the upper die are driven to contact the inner wall of the stroke groove of the sliding forming lower die; when the upper die seat moves upward, the forced reset part of the upper die is driven to contact the corresponding lower reset groove of the stroke groove of the sliding forming lower die.

[0014] As a further improvement of the present invention, a mounting groove for mounting each sliding forming lower die is provided on the lower template. When the unloading plate moves downward until each profiling pressing component presses the upper end face and the outer periphery of the annular chuck workpiece, each part to be bent is located between the sliding forming lower die and the inner wall of the mounting groove; when the reset upper die is driven to move downward until its outer side surface contacts the lower thrust surface of the stroke groove of the sliding forming lower die, the sliding forming lower die moves outward to the lower side of the corresponding part to be bent, and the horizontal section of the part to be bent is located between the profiling pressing component and the sliding forming lower die, and the upper die bending punch punches the part to be bent; when the upper die bending punch moves downward until the upper die reaches the lower dead point, the upper die bending punch bends the L-shaped part to be bent into a U-shape, and the sliding forming lower die is embedded in the U-shaped part to be bent.

[0015] As a further improvement of the present invention, when the driving reset upper die moves upward until the forced reset portion reaches between the inner limit surface and the lower push surface of the sliding forming lower die, the sliding forming lower die is separated from the U-shaped portion to be bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of each sliding forming lower mold on the lower mold base of the present invention.

[0017] Figure 2 It is a top view of each slide forming lower mold.

[0018] Figure 3 This is a schematic diagram of the structure of the chuck workpiece on the material strip before bending.

[0019] Figure 4 for Figure 3 BB section view.

[0020] Figure 5 This is a schematic diagram of the structure in which the chuck workpiece floats on the material strip after bending.

[0021] Figure 6 for Figure 5 CC section view.

[0022] Figure 7 for Figure 2 AA section view (the upper die base is at the highest point).

[0023] Figure 8 It is a top view of the sliding forming lower die and two adjacent sliding guide rails.

[0024] Fig. 9 It is a vertical cross-sectional view of the sliding forming lower die and two adjacent sliding guide rails.

[0025] Fig.10 for Figure 7 A partial enlarged view of .

[0026] Fig.11This is a structural schematic diagram of the unloading plate starting to press the material.

[0027] Fig.12 It is a schematic diagram of the structure of the upper die contacting the sliding forming lower die for driving the reset upper die.

[0028] Fig.13 It is a schematic diagram of the structure when the unloading plate is pressed into place.

[0029] Fig.14 A schematic diagram of the structure of the sliding forming lower die for driving the reset upper die to push outward.

[0030] Fig.15 It is a schematic diagram of the structure when the sliding forming lower die moves radially outward into position.

[0031] Fig.16 It is a schematic diagram of the structure in the closed mold state.

[0032] Fig.17 It is a structural schematic diagram of the forced reset part of the driving reset upper mold contacting the inner wall of the lower reset groove of the sliding forming lower mold when moving upward and returning.

[0033] Fig.18 It is a structural schematic diagram of the sliding forming lower die when the upper die is reset into place by the driving reset.

[0034] Fig.19 It is a structural schematic diagram of the mold opening state in which the upper mold base returns to the highest point.

[0035] Among them, 1 upper die base, 2 lower die base, 3 unloading plate, 4 nitrogen spring, 5 lower fixed plate, 6 sliding forming lower die, 601 travel limit pin, 6a inner limit surface, 6b upper push surface, 6c lower push surface, 7 drive fixed plate, 8 contour pressing component, 8a clamping surface one, 8b clamping surface two, 9 sliding guide rail, 10 slide groove, 11 reset drive spring, 12 lower template, 12a installation groove, 13 chuck workpiece, 13a to be bent part, 13a1 transition part, 14 avoidance groove, 15 drive reset upper die, 15a forced reset part, 15a1 reset extrusion push surface, 15b first extrusion push surface, 15c second extrusion push surface, 16 upper die bending punch, 17 functional groove, 18 main groove, 18a upper avoidance groove, 18b lower reset groove, 19 bending groove, 20 material strip. DETAILED DESCRIPTION

[0036] like Figure 1-19As shown, a buckle bending and punching device for a fuel tank chuck is provided, comprising an upper die seat 1 and a lower die seat 2 corresponding to each other, a stripper plate 3 is provided between the upper die seat 1 and the lower die seat 2, a plurality of nitrogen springs 4 are provided on the lower side of the upper die seat 1 corresponding to the stripper plate 3, the stripper plate 3, the upper die seat 1 and the lower die seat 2 are all arranged horizontally, and the nitrogen springs 4 are arranged vertically; the lower ends of the nitrogen springs 4 elastically abut against the upper side of the stripper plate 3, a lower fixed plate 5 is provided on the lower die seat 2, a plurality of groups of sliding forming lower dies 6 which are arranged at intervals along the circumferential direction and can move radially are arranged on the lower fixed plate 5, a driving fixed plate 7 is provided on the lower side of the upper die seat 1, a plurality of groups of upper die assemblies which are arranged at intervals along the circumferential direction are provided on the driving fixed plate 7 corresponding to each sliding forming lower die 6, a plurality of profiling pressing parts 8 which are arranged at intervals along the circumferential direction are provided on the stripper plate 3 corresponding to each sliding forming lower die 6, and each profiling pressing part 8 is arranged one-to-one with each group of upper die assemblies.

[0037] Each of the sliding forming lower dies 6 is evenly arranged along the circumferential direction, and a sliding guide rail 9 is correspondingly arranged on both sides of the circumferential edge of each sliding forming lower die 6 on the lower fixed plate 5, and the sliding forming lower die 6 is movably connected with the corresponding two circumferentially adjacent sliding guide rails 9, and each sliding forming lower die 6 and each sliding guide rail 9 are staggered in sequence along the circumferential direction. The sliding guide rail 9 guides the radial movement of the sliding forming lower die 6.

[0038] A slide groove 10 is radially provided on the lower fixed plate 5 corresponding to each sliding forming lower die 6. A travel limit pin 601 extending downward into the corresponding slide groove 10 is vertically fixed on the sliding forming lower die 6. The travel limit pin 601 is in contact with the inner wall of the inner end of the slide groove 10. A return drive spring 11 is radially provided between the travel limit pin 601 and the inner wall of the outer end of the corresponding slide groove 10. A lower mold plate 12 is fixed on the upper side of the lower fixed plate 5. After the sliding forming lower die 6 moves radially outward, the return drive spring 11 can reset the sliding forming lower die 6. An installation groove 12a for installing each sliding forming lower die 6 is provided in the middle of the lower mold plate 12. A spacing is left between the inner wall of the installation groove 12a and the outer periphery of the sliding forming lower die 6 to prevent interference when the upper die bending punch 16 bends the portion to be bent 13a.

[0039] An annular chuck workpiece 13 to be bent and punched is arranged between each of the upper die assemblies, the profiling pressing component 8 and the sliding forming lower die 6 below. The outer periphery of the chuck workpiece 13 is provided with a plurality of L-shaped portions to be bent 13a uniformly distributed along the circumferential direction, and an arc-shaped transition portion 13a1 is provided between the portions to be bent 13a and the chuck workpiece 13. An annular avoidance groove 14 is provided at the bottom of the stripper plate 3 corresponding to the chuck workpiece 13. A plurality of embedding grooves are provided on the stripper plate 3 corresponding to each of the profiling pressing components 8. Each embedding groove is located above the avoidance groove 14. Each of the profiling pressing components 8 is respectively fitted into the corresponding embedding groove. The lower portion of the profiling pressing component 8 is provided with an annular avoidance groove 14 corresponding to the chuck workpiece 13. A pressing groove is provided, and a horizontal pressing surface 8a and an arc-shaped pressing surface 8b are provided on the inner wall of the pressing groove. After the chuck workpiece 13 enters the avoidance groove 14, the pressing surface 8a and the pressing surface 8b correspond to the upper end and the outer periphery of the annular chuck workpiece 13, respectively, and the horizontal section of the L-shaped portion to be bent 13a is in contact with the lower surface of the unloading plate 3; the upper die assembly includes a driving and resetting upper die 15 and an upper die bending punch 16, and the driving and resetting upper die 15 and the upper die bending punch 16 are respectively located on the inner and outer sides of the corresponding profiling pressing component 8 in the radial direction, and a plurality of through holes are opened on the unloading plate 3 corresponding to each driving and resetting upper die 15 and the upper die bending punch 16. The chuck workpiece 13 enters the avoidance groove 14, and the pressing surface 1 8a and the pressing surface 2 8b of the contoured pressing component 8 respectively press the upper end and the outer periphery of the annular chuck workpiece 13, driving the reset upper die 15 and the upper die bending punch 16 to move downward through the unloading plate 3.

[0040] The driving reset upper die 15 and the upper die bending punch 16 are both arranged vertically, the cross section of the driving reset upper die 15 is rectangular, a functional groove 17 is provided on the lower outer side of the driving reset upper die 15, a forced reset portion 15a is provided on the lower inner side of the driving reset upper die 15, the height of the functional groove 17 is greater than the height of the forced reset portion, a vertical first extrusion surface 15b and an inclined second extrusion surface 15c are provided on the inner wall of the functional groove 17 of the driving reset upper die 15, and an arc-shaped connecting surface is provided between the first extrusion surface 15b and the bottom surface of the driving reset upper die 15 , an arc-shaped connection surface is provided between the first pushing surface 15b and the second pushing surface 15c, an arc-shaped connection surface is provided between the second pushing surface 15c and the outer side surface of the driving reset upper mold 15, the bottom surface of the forced reset portion 15a is flush with the bottom surface of the driving reset upper mold 15, and a reset pushing surface 15a1 is also inclined on the forced reset portion 15a, an arc-shaped connection surface is provided between the reset pushing surface 15a1 and the bottom surface of the forced reset portion 15a, and an arc-shaped connection surface is provided between the reset pushing surface 15a1 and the inner side surface of the driving reset upper mold 15. By inserting the driving reset upper mold 15 into the stroke groove and cooperating with the sliding forming lower mold 6, the sliding forming lower mold 6 is driven to move outward to compress the reset driving spring 11, and the sliding forming lower mold 6 can be forced to reset, the arc-shaped connection surface of the driving reset upper mold 15 contacts the inner wall of the stroke groove of the sliding forming lower mold 6, and the arc-shaped flexible contact drive is smoother, avoiding direct hard contact collision.

[0041] A travel groove is provided on the sliding forming lower die 6 corresponding to the driven reset upper die 15, and the travel groove includes a main groove 18 and an upper avoidance groove 18a14 and a lower reset groove 18b located on the inner side of the main groove 18. An inner limit surface 6a is vertically provided on the inner inner wall of the travel groove, and an inclined upper push surface 6b located above and a vertical lower push surface 6c located below are respectively provided on the outer inner wall of the travel groove. The upper push surface 6b and the lower push surface 6c are arranged corresponding to the functional groove 17, and the lower reset groove 18b is arranged corresponding to the forced reset portion 15a. The spacing between the inner and outer side surfaces of the driven reset upper die 15 is arranged corresponding to the spacing between the inner limit surface 6a and the lower push surface 6c of the travel groove, and a bending groove 19 is provided on the outer side of the sliding forming lower die 6 to accommodate the bending portion 13a to enter. An arc-shaped connecting surface is provided between the inner wall of the upper avoidance groove 18a14 and the inner limit surface 6a, an arc-shaped connecting surface is provided between the inner limit surface 6a and the inner wall of the lower reset groove 18b, and an arc-shaped connecting surface is provided between the upper push surface 6b and the lower push surface 6c; when the upper die base 1 moves downward, the first pushing surface 15b and the second pushing surface 15c of the reset upper die 15 are driven to contact the inner wall of the stroke groove of the sliding forming lower die 6; when the upper die base 1 moves upward, the forced reset part 15a of the reset upper die 15 is driven to contact the lower reset groove 18b of the stroke groove of the sliding forming lower die 6.

[0042] The lower template 12 is provided with a mounting groove 12a for mounting each sliding forming lower mold 6. When the stripper plate 3 moves downward until each profiling pressing component 8 presses the upper end surface and the outer periphery of the annular chuck workpiece 13, each portion to be bent 13a is located between the sliding forming lower mold 6 and the inner wall of the mounting groove 12a; when the upper mold 15 is driven to move downward until its outer side surface contacts the lower pushing surface 6c of the stroke groove of the sliding forming lower mold 6, the sliding forming lower mold 6 moves outward to the lower side of the corresponding portion to be bent 13a, and the horizontal section of the portion to be bent 13a is located between the profiling pressing component 8 and the sliding forming lower mold 6, and the upper mold bending punch 16 punches the portion to be bent 13a; when the upper mold bending punch 16 moves downward until the upper mold reaches the lower dead point, the upper mold bending punch 16 bends the L-shaped portion to be bent 13a into a U shape, and the sliding forming lower mold 6 is embedded in the U-shaped portion to be bent 13a. When the driving reset upper die 15 moves upward until the forced reset portion 15a reaches between the inner limit surface 6a and the lower push surface 6c of the sliding forming lower die 6, the sliding forming lower die 6 is separated from the U-shaped portion to be bent 13a.

[0043] The upper die and lower die of the present invention serve as a bending and stamping station of the progressive die, and the corresponding progressive die on the punch press is equipped with a floating material mechanism. The feeding mechanism drives the material strip 20 to move backward, and the chuck workpiece 13 to be bent and stamped is connected to the bending and stamping station of the material strip 20 (the chuck workpiece 13 is a part of the material strip 20 and has not yet been subjected to the last stamping station of the progressive die, so the chuck workpiece 13 has not yet been separated from the material strip 20). The floating material mechanism can lift the entire material strip 20 and the chuck workpiece 13 on the material strip 20; the upper die base 1 and the lower die base 2 of the present invention are installed on the punch press, and the punch press slider drives the upper die base 1 to perform up and down reciprocating lifting and lowering motions. A plurality of unloading sleeves are vertically arranged on the unloading plate 3 of the present invention, the upper end of each unloading sleeve passes through the upper die base 1 and the outer periphery of the protruding end of the unloading sleeve is provided with a limiting step, the unloading plate 3 is fixed with a plurality of guide pillars, each guide pillar passes through the corresponding unloading plate 3 and is perpendicular to the unloading plate 3, and a guide sleeve is respectively arranged at the upper and lower ends of each guide pillar on the upper die base 1 and the lower die base 2, and the two ends of the guide pillar are respectively movably connected with the corresponding upper and lower guide sleeves; when the upper die base 1 is at the highest point, the nitrogen spring 4 presses the unloading plate 3 downward so that the distance between the unloading plate 3 and the upper die base 1 is maximized. During the bending and stamping operation, the contoured pressing component 8 presses the annular chuck workpiece 13, drives the reset upper die 15 to cooperate with the sliding forming lower die 6, so that the sliding forming lower die 6 positions the lower side of the L-shaped portion to be bent 13a of the chuck workpiece 13, and the upper die bending punch 16 punches the L-shaped portion to be bent 13a into a U shape; after the stamping is completed, the upper die assembly rises, drives the reset upper die 15 to cooperate with the sliding forming lower die 6, so that the sliding forming lower die 6 is separated from the U-shaped portion to be bent 13a.

[0044] The upper die base 1 of the present invention is installed on the punch slide, such as Figure 7 When the die is in the open state, the punch slide reaches the highest point, the die is fully opened, the upper die is completely separated from the lower die, the unloading plate 3 is completely ejected by the nitrogen spring 4, and the sliding forming lower die 6 is completely reset by the reset drive spring 11. The parts of the previous process are fed into this process by the process material belt 20 by the feeding mechanism, and the material belt 20 is lifted by the floating material mechanism of the lower die; Fig.11 , the unloading plate 3 starts to press the material, the punch slide moves downward, the upper die is fixed on the punch slide and moves downward together, the contoured pressing component 8 on the unloading plate 3 starts to press the material, the guide needle pours into the guide hole on the material belt 20 to accurately position the stamped parts, the floating mechanism of the lower die contacts the unloading plate 3, and the unloading plate 3 starts to press down, driving the stamped parts to move downward; Fig.12 , the arc-shaped connection surface between the first extrusion surface 15b and the bottom surface of the driving reset upper die 15 contacts the upper push surface 6b of the sliding forming lower die 6, and the punch slider continues to move downward, driving the sliding forming lower die 6 to move outward, and the travel limit pin 601 compresses the reset driving spring 11; Fig.13, the punch slide continues to move downward, the unloading plate 3 is in place, the unloading plate 3 remains stationary, the upper die assembly continues to move downward, the nitrogen spring 4 is opened and compressed backward by the unloading plate 3, and the stamping parts are completely fixed in the die process; Fig.14 , the punch slide continues to move downward, the first pushing surface 15b is in contact with the lower pushing surface 6c and the second pushing surface 15c is in contact with the upper pushing surface 6b, the driving reset upper die 15 starts to forcefully push the sliding forming lower die 6, the sliding forming lower die 6 continues to move forward, and the reset driving spring 11 is continuously compressed; Fig.15 , the punch slide continues to move downward, driving the reset upper die 15 to push the sliding forming lower die 6 to the set position, driving the reset upper die 15 to fit the outer side surface of the lower push surface 6c of the stroke groove, and the upper die bending punch 16 contacts the portion to be bent 13a, and the bending stamping is started; Fig.16 At this time, the punch slide moves to the lowest point, the mold is completely closed, the stripper plate 3 compresses the nitrogen spring 4 into place, the sliding forming lower mold 6 is driven by the driving reset upper mold 15 to be fully in place, and the to-be-bent portion 13a of the chuck workpiece 13 is pressed into the bending groove 19 by the punch and becomes a U shape, and the entire stamping process is completed; Fig.17 At this time, the punch slide starts to move upward, and the upper die seat 1 starts to move with the punch slide as a whole. The stripper plate 3 is pressed by the nitrogen spring 4 and does not move. The nitrogen spring 4 starts to reset, and the stamped parts do not move. The upper die 15 is forced to return and reset by the driving reset upper die 15. The forced reset portion 15a contacts with the inner wall of the lower reset groove 18b, and the reset driving spring 11 drives the sliding forming lower die 6 to retreat; Fig.18 At this time, the punch slide starts to continue to move upward, the upper die seat 1 starts to move with the punch slide as a whole, the stripper plate 3 nitrogen spring 4 is reset to position, and starts to move upward with the upper die, the sliding forming lower die 6 is forced to reset to position by the driving reset upper die 15, and the part embedded in the sliding forming lower die 6 after the stamping part is bent is out of the lower die due to the reset of the lower die, and the lower die floating mechanism starts to work and lifts the chuck workpiece 13; Fig.19 , the return stroke is reset to the mold open state. At this time, the punch slide reaches the highest point, the mold is fully opened, the upper mold is completely separated from the lower mold, and the process is repeated after the feeder feeds the parts from the previous process. Figure 7 action.

[0045] The present invention can solve the problem that the stamping part cannot be released from the die after being bent, perfectly realizes the release of the bent edge punched by the chuck from the die, and can have a stable production capacity.

[0046] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A buckle bending punching device for a fuel tank chuck, comprising an upper die seat and a lower die seat corresponding to each other, a stripper plate is arranged between the upper die seat and the lower die seat, a plurality of nitrogen springs are arranged on the lower side of the upper die seat corresponding to the stripper plate, and the lower end of each nitrogen spring elastically contacts the upper side of the stripper plate, characterized in that: The lower die seat is provided with a lower fixed plate, on which are arranged a plurality of groups of sliding forming lower dies which are circumferentially spaced and radially movable; a driving fixed plate is provided on the lower side of the upper die seat, on which are arranged a plurality of groups of upper die assemblies which are circumferentially spaced corresponding to each sliding forming lower die; and the unloading plate is provided with a plurality of profiling pressing components which are circumferentially spaced corresponding to each sliding forming lower die, and each profiling pressing component is arranged in one-to-one correspondence with each group of upper die assemblies.

2. A fuel tank chuck inner buckle bending and punching device according to claim 1, characterized in that: The unloading plate, the upper die seat and the lower die seat are all arranged horizontally, and the nitrogen spring is arranged vertically.

3. A fuel tank chuck inner buckle bending and punching device according to claim 1 or 2, characterized in that: Each of the sliding forming lower dies is evenly distributed along the circumferential direction, and a sliding guide rail is correspondingly provided on both sides of the circumferential edge of each sliding forming lower die on the lower fixed plate. The sliding forming lower die is movably connected to the corresponding two circumferentially adjacent sliding guide rails, and each sliding forming lower die and each sliding guide rail are staggered in sequence along the circumferential direction.

4. A fuel tank chuck inner buckle bending and punching device according to claim 3, characterized in that: A sliding groove is radially provided on the lower fixed plate corresponding to each sliding forming lower die, and a travel limit pin extending downward into the corresponding sliding groove is vertically fixed on the sliding forming lower die, the travel limit pin fits the inner wall of the inward end of the sliding groove, and a reset drive spring is radially provided between the travel limit pin and the inner wall of the outward end of the corresponding sliding groove, and a lower mold plate is fixed on the upper side of the lower fixed plate.

5. A fuel tank chuck inner buckle bending and punching device according to claim 1 or 2, characterized in that: An annular chuck workpiece to be bent and punched is arranged between each of the upper die assemblies, the profiling pressing parts and the sliding forming lower die below. The outer periphery of the chuck workpiece is provided with a plurality of L-shaped portions to be bent evenly distributed along the circumferential direction. An arc-shaped transition portion is provided between the portions to be bent and the chuck workpiece. An annular avoidance groove is provided at the bottom of the discharge plate corresponding to the chuck workpiece. A plurality of embedding grooves are provided on the discharge plate corresponding to each of the profiling pressing parts. Each embedding groove is located above the avoidance groove. Each profiling pressing part is respectively embedded in the corresponding embedding groove. A pressing groove is provided on the inner wall of the pressing groove, and a horizontal pressing surface 1 and an arc-shaped pressing surface 2 are provided. After the chuck workpiece enters the avoidance groove, the pressing surface 1 and the pressing surface 2 correspond to the upper end and the outer periphery of the annular chuck workpiece, and the horizontal section of the L-shaped part to be bent is in contact with the lower surface of the unloading plate; the upper die assembly includes a driven reset upper die and an upper die bending punch, which are respectively located on the inner and outer sides of the corresponding profiling pressing parts in the radial direction, and a plurality of through holes are penetrated on the unloading plate corresponding to each driven reset upper die and the upper die bending punch.

6. A fuel tank chuck inner buckle bending and punching device according to claim 5, characterized in that: The driven reset upper die and the upper die bending punch are both arranged vertically, the cross-section of the driven reset upper die is rectangular, a functional groove is opened on the outer side of the lower part of the driven reset upper die, a forced reset part is arranged on the inner side of the lower part of the driven reset upper die, the height of the functional groove is greater than the height of the forced reset part, a vertical first pushing surface and an inclined second pushing surface are arranged on the inner wall of the functional groove of the driven reset upper die, an arc-shaped connecting surface is arranged between the first pushing surface and the bottom surface of the driven reset upper die, an arc-shaped connecting surface is arranged between the first pushing surface and the second pushing surface, an arc-shaped connecting surface is arranged between the second pushing surface and the outer side surface of the driven reset upper die, the bottom surface of the forced reset part is flush with the bottom surface of the driven reset upper die, a reset pushing surface is also inclined on the forced reset part, an arc-shaped connecting surface is arranged between the reset pushing surface and the bottom surface of the forced reset part, and an arc-shaped connecting surface is arranged between the reset pushing surface and the inner side surface of the driven reset upper die.

7. A fuel tank chuck inner buckle bending and punching device according to claim 6, characterized in that: A travel groove is provided on the sliding forming lower die corresponding to the driven reset upper die, the travel groove includes a main groove and an upper avoidance groove and a lower reset groove located on the inner side of the main groove, an inner limit surface is vertically provided on the inner inner wall of the travel groove, and an inclined upper push surface located above and a vertical lower push surface located below are respectively provided on the outer inner wall of the travel groove, the upper push surface and the lower push surface are arranged corresponding to the functional groove, the lower reset groove is arranged corresponding to the forced reset part, the spacing between the inner and outer side surfaces of the driven reset upper die is arranged corresponding to the spacing between the inner limit surface and the lower push surface of the travel groove, and a bending groove is provided on the outer side of the sliding forming lower die for accommodating the bending part to enter.

8. A fuel tank chuck inner buckle bending and punching device according to claim 7, characterized in that: The lower template is provided with mounting grooves for mounting each sliding forming lower die. When the unloading plate moves downward until each profiling pressing component presses the upper end surface and the outer periphery of the annular chuck workpiece, each part to be bent is located between the sliding forming lower die and the inner wall of the mounting groove; when the reset upper die is driven to move downward until its outer side surface contacts the lower pushing surface of the stroke groove of the sliding forming lower die, the sliding forming lower die moves outward to the lower side of the corresponding part to be bent, and the horizontal section of the part to be bent is located between the profiling pressing component and the sliding forming lower die, and the upper die bending punch punches the part to be bent; when the upper die bending punch moves downward until the upper die reaches the lower dead point, the upper die bending punch bends the L-shaped part to be bent into a U-shape, and the sliding forming lower die is embedded in the U-shaped part to be bent.

9. A fuel tank chuck inner buckle bending and punching device according to claim 8, characterized in that: When the driving reset upper die moves upward until the forced reset portion reaches between the inner limit surface and the lower push surface of the sliding forming lower die, the sliding forming lower die is separated from the U-shaped portion to be bent.

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