CN112659488B

CN112659488B - Automobile bumper mould

Info

Publication number: CN112659488B
Application number: CN202011401360.4A
Authority: CN
Inventors: 徐文
Original assignee: Suzhou Baoyulai Intelligent Equipment Co ltd
Current assignee: Suzhou Baoyulai Intelligent Equipment Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2022-10-04
Anticipated expiration: 2040-12-04
Also published as: CN112659488A

Abstract

The invention discloses an automobile bumper mould which comprises a base, a bumper mould set, a blanking groove and a conveying crawler belt, wherein the base is provided with a plurality of grooves; the bumper mould set comprises a cavity shell fixedly connected to the base, a core shell slidably arranged on the base, a mould guide post arranged on the core shell, a mould guide hole arranged on the cavity shell, a separated type cavity capable of moving back and forth in the cavity shell, a cavity cylinder used for driving the separated type cavity to move, a convergent type core capable of moving back and forth in the core shell, a core cylinder used for driving the convergent type core to move, a first chute arranged on the inner wall of the core shell, a first block body capable of moving back and forth in the first chute and a fixing structure used for fixing the first block body; the first block is fixedly connected to the outer wall of the inner convergent type mold core; according to the invention, through the arrangement of the easy-demoulding core and the separated type cavity, the demoulding efficiency is accelerated, the demoulding quality is improved, and the easy-demoulding core has good adaptability to the bumper with smaller radian.

Description

Automobile bumper mould

Technical Field

The invention belongs to the technical field of automobile production, and particularly relates to an automobile bumper mould.

Background

As the automobile industry develops, automobile bumpers are required to be lightweight as an important safety device in addition to a protection function, and front and rear bumpers of automobiles are formed by injection molding of plastic materials through molds for the purpose of weight reduction. The automobile bumper made of plastic has good strength, rigidity and decoration, and can play a role of buffering when an automobile collides, so that front and rear automobile bodies are protected. In the prior art, the automobile bumper is provided with a front lamp or a rear lamp, and the front lamp or the rear lamp is connected with the panel at the position of the lampshade into a whole so as to improve the aesthetic property.

The core and the die cavity are usually integrated, under the condition of an integrated structure, the bending radian of a part of a bumper is small, even the front surface and two sides of the bumper form a right-angled type to be processed difficultly, and particularly, the front surface and the two sides of the bumper are reflected on demoulding.

Disclosure of Invention

The invention provides the automobile bumper mould with high demoulding efficiency and high yield in order to overcome the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: an automobile bumper mould comprises a base, a bumper mould group arranged on the base, a blanking groove arranged on the base and a conveying crawler belt used for conveying finished products; the bumper mould set comprises a cavity shell fixedly connected to the base, a core shell slidably arranged on the base, a mould guide post arranged on the core shell, a mould guide hole arranged on the cavity shell, a separated mould cavity capable of moving back and forth in the cavity shell, a mould cavity air cylinder used for driving the separated mould cavity to move, an inward converging type mould core capable of moving back and forth in the core shell, a mould core air cylinder used for driving the inward converging type mould core to move, a first sliding groove formed in the inner wall of the mould core shell, a first block body capable of moving back and forth in the first sliding groove and a fixing structure used for fixing the first block body; the first block is fixedly connected to the outer wall of the inner convergent type mold core; the mold core cylinder pushes the internally-converging type mold core to move, the first block body moves in the first sliding groove in the moving process, when the first block body moves to the tail end, the movement of the mold core cylinder drives the mold core shell to move, the movement of the mold core shell drives the butt joint between the mold guide post and the mold guide hole, so that a good positioning butt joint effect is achieved, the butt joint of the mold is more accurate, then the movement of the mold core cylinder pushes the separated type mold cavity to move into the mold cavity shell, then injection molding is carried out, after the injection molding is completed, the mold cavity cylinder is ejected outwards, the mold core cylinder retracts inwards, in the process that the mold cavity cylinder is ejected outwards, when the separated type mold cavity is exposed out of the mold cavity shell, the separated type mold cavity is disassembled to a certain degree, the mold core cylinder drives the internally-converging type mold core to retract, demolding is carried out on the product in the mode that the mold core retracts inwards, so that the separation between the mold cavity and the finished product is realized, the bumper finished product has better demolding capability on a bumper product with smaller gradient at two ends, the scratch possibility of the mold is effectively reduced, the maintenance cost of the mold is reduced, and the final surface of the mold is improved, and the demolding efficiency is improved more quickly.

The separated type cavity comprises a first cavity fixedly connected to the cavity cylinder, a first notch arranged on the first block, a second cavity arranged in the first notch, a first rotating piece used for connecting the first cavity and the second cavity, a first elastic piece arranged in the first notch and used for resetting the second cavity, and an air pressure demoulding structure arranged in the second cavity; when first die cavity receives the outside ejecting time of promotion of core cylinder, the second die cavity has lost the die cavity shell to its spacing, thereby under the effect of first elastic component, outwards open, thereby separation between first die cavity and the second die cavity has been realized, make the second die cavity throw off with the form rotatory round first rotating member, then accomplish the drawing of patterns to the bumper both sides this moment, thereby the drawing of patterns efficiency has been accelerated, the form that here adopted atmospheric pressure simultaneously carries out the drawing of patterns, promote finished product surface through atmospheric pressure, thereby effectual sunken of having reduced the easy production of ejecting position, the possibility that the white point takes place, thereby effectively improved the surface quality of product end product, the quality of product has been improved.

The air pressure demoulding structure comprises a first cavity arranged in the second cavity, a first sliding block capable of moving in the first cavity, a guide hole arranged on the first sliding block, a guide pillar fixedly connected to the side wall of the first cavity, a first limiting block arranged on the guide pillar, a second elastic piece sleeved on the guide pillar and used for resetting the first sliding block, a first through hole arranged on the side wall of the first cavity, a vertical block arranged in the first cavity and corresponding to the first through hole, a second limiting block arranged on the vertical block, a blocking block capable of moving back and forth in the vertical block and used for blocking the first through hole, a third elastic piece with two ends respectively fixedly connected with the blocking block and the first sliding block, an air inlet arranged on the second cavity, a clamping structure used for fixing the blocking block and an extrusion structure used for driving the first sliding block to move; when first die cavity receives the promotion of the core of butt joint with it, first die cavity and second die cavity receive the extrusion and move to the die cavity shell this moment, it will constantly contact with die cavity shell inner wall to remove in-process extrusion structure moving, thereby promote first slider and move to first cavity inside, the third elastic component will promote the shutoff piece and remove in founding the piece this moment, thereby setting up through the third elastic component makes the shutoff piece possess certain displacement space, thereby displacement distance to first slider possesses the scope of bearing of certain degree, thereby make the shutoff that the shutoff piece can be complete, avoided because the mould body damage that the shutoff piece too tightly leads to, or the here that leads to too loose has the molten liquid to overflow, thereby the shutoff piece is stopped up first through-hole at last, thereby seal first through-hole, form the cooperation between guide pillar and the guide hole, thereby make first slider can be in the first cavity in the round trip movement of first cavity, the smoothness that first slider moved has been guaranteed, when moulding plastics and accomplishing, first stationarity will move outwards this moment, thereby first slider moves outside, thereby the conveying is through the high temperature of the first slider and has effectively been caught the cooling air flow to the product in the first cavity through-up the first through-air flow when the drawing the supplementary cooling process of the drawing.

The clamping structure comprises a notch arranged on the vertical block, a fixed block arranged in the notch, a second cavity arranged in the fixed block, a second sliding block capable of moving back and forth in the second cavity, a fourth elastic part arranged in the second cavity and used for resetting the second sliding block, a third cavity arranged on one side of the second cavity, a push plate capable of moving back and forth in the third cavity, a pull rod arranged on the push plate, an extrusion opening arranged on the pull rod, a clamping opening arranged on the second sliding block, a second through hole arranged on the side wall of the first cavity, and a push rod arranged on the first sliding block and corresponding to the second through hole; pass the second through-hole through the push rod, thereby promote the push pedal and remove, the push pedal will drive the pull rod and remove at the carriage release lever in-process, through setting up the extrusion mouth on drawing the steel and locating the cooperation between the joint mouth on the second slider, thereby promote the second slider outwards to remove, the shutoff to first through-hole has been accomplished to the shutoff piece this moment, the outside removal of second slider will be fixed the shutoff piece this moment, thereby the pressure that makes can not be owing to mould plastics the production at the in-process shutoff piece of moulding plastics thereby remove, thereby avoided thereby leaving the seal of first through-hole on the finished product of bumper because the removal of shutoff piece, thereby subsequent step of polishing has been reduced, the final quality of product has been guaranteed.

The extrusion structure comprises a support arranged on the first sliding block, a central rod arranged on the support, a rotating block sleeved on the central rod, a chamfer arranged on the rotating block, a containing groove arranged on the rotating block, a plurality of first rollers arranged in the containing groove and an extrusion track arranged on the side wall of the cavity shell; when the second die cavity retracts into the die cavity shell, the extrusion track on the inner wall of the die cavity shell extrudes the rotary block, the rotary block and the extrusion track are arranged through the first roller, friction between the rotary block and the extrusion track is reduced, the rotary block is arranged through the extrusion track before the first through hole is separated from the second through hole, before mechanical demolding is used, demolding is performed in advance through the air pressure, the successful probability of demolding is increased, air drying is performed on the surface of the film to a certain degree, drying of products is accelerated, final quality of the products is effectively guaranteed, meanwhile, the rotary block is rotated, the extrusion track can be better attached, friction between the second die cavity and the die cavity shell is effectively reduced, and the service life of the die is prolonged.

The easy-demoulding mold core comprises a first mold core fixedly connected to the mold core cylinder, a bevel angle arranged on the first mold core, a second notch arranged in the mold core shell, a second mold core arranged in the second notch and corresponding to the first mold core, a second rotating piece used for connecting the second mold core and the mold core shell, a fifth elastic piece arranged in the notch and used for resetting the second mold core, a step arranged at the splicing position of the first mold core and the second mold core, an injection molding flow channel arranged on the step and a buffer structure arranged in the first mold core; be provided with the oblique angle between first core and the second core, thereby when first core inwards contracts back under the drive of core cylinder, first core is at the removal in-process, the preferred horizontal bar position drawing of patterns to the bumper bar, this moment because the both ends of bumper receive the support of second core, thereby it is more convenient complete to demold, break away from each other between the in-process first core of deciduating and the second core, the runner of moulding plastics originally has the amalgamation between first core and the second core to constitute, the removal of first core will make the bottom of the runner of moulding plastics lose the support this moment, when first core removes, the runner of moulding plastics will lose the support, and the material in the runner of moulding plastics can drop, after first core contracts back to certain degree, the second core will rotate round the second rotating member, thereby realize breaking away from between second core and the boring, and rotatory second core will no longer play the supporting role to the material, thereby the material will drop downwards, thereby accomplish the unloading process, first core resets afterwards, thereby promote the second core once more, the setting through the effective setting of this structure, the efficiency of taking off, thereby the unloading efficiency of the mould is reduced the material mode that makes things convenient for unloading is retracted, thereby the unloading cost of the material on the core more thoroughly.

The buffer structure comprises a fourth cavity arranged on the first mold core, a first fixed column arranged in the fourth cavity, a first rotating rod with one end rotatably sleeved on the first fixed column, a second roller arranged at the other end of the first rotating rod, and a sixth elastic element arranged in the fourth cavity and used for resetting the first rotating rod; through the setting of this structure, when making first core backward movement, the second type pellet is under buffer structure's effect, still can keep the steady state of certain time, thereby the stability of the preferential demolding of first core has been guaranteed, guaranteed simultaneously that the runner of moulding plastics will preferentially realize the separation, avoid the too early rotation of second core to extrude the material of gate department, thereby cause the possibility of damage to the product, and, the speed of empting has been slowed down at the in-process of empting to the setting up through this structure messenger follow-up second core, thereby the possibility of the damage of the material that leads to at the excessive speed of demolding has been avoided, thereby the quality of product has effectively been guaranteed.

The fixing structure comprises a second block body arranged above the core shell, a second sliding groove arranged on the second block body, a third sliding block arranged above the core shell, a first convex tooth arranged above the second sliding groove, a fifth cavity arranged on the third sliding block, a gear arranged in the fifth cavity, a second fixed column arranged on the gear, a fourth sliding block capable of moving back and forth in the fifth cavity, and a second rotary rod, one end of which is sleeved on the second fixed column, and the other end of which is rotatably connected on the fourth sliding block; the second block passes through the cooperation between third slider and the second spout, thereby fixed the die cavity shell, thereby guaranteed the stability that the die cavity shell removed, when the die cavity shell outwards removed, this moment because the cooperation between first dogtooth and the gear, thereby make the gear rotate, thereby make the second swing arm remove, thereby promote the fourth slider and remove downwards along the second spout, thereby expose in first spout, fix first block, when the core cylinder promotes first core and removes, will preferentially make first core remove in the core shell, thereby make the core reset, form complete core, fix first core afterwards, when the core cylinder drives first core and contracts to reset, first core receives fixedly at this moment, will be reset by core shell priority, unblock to the spacing of first block afterwards, first core resets again, through the setting of this structure, will guarantee that the core preferentially breaks away from between the die cavity with the die cavity again, break away from between core and the product again, avoid the product to break away from in the die cavity, the material that leads to the automatic interference falls, the work efficiency that leads to the effective work efficiency that has improved, the stability that can's the improvement.

According to the invention, the easy-demoulding core and the separated cavity are arranged, and demoulding is carried out through deformation between the core and the cavity, so that demoulding efficiency is effectively accelerated, demoulding quality is improved, the bumper with smaller radian has good adaptability, and meanwhile, through the arrangement of the air pressure demoulding structure, materials are subjected to auxiliary demoulding in an air pressure mode, so that the product is less prone to being damaged, the surface of the product is smoother, and the quality is better.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a right side view of the present invention.

Fig. 3 isbase:Sub>A schematic perspective cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2.

Fig. 4 is a partially enlarged schematic view of fig. 3.

Fig. 5 is a front view of the present invention.

Fig. 6 is a perspective cross-sectional view of fig. 5 taken along line B-B.

Fig. 7 is an enlarged schematic view of a portion a of fig. 6.

Fig. 8 is a partially enlarged view of fig. 7.

Fig. 9 is a partially enlarged schematic view of fig. 8.

Fig. 10 is an enlarged schematic view at B in fig. 6.

Fig. 11 is a schematic structural view of the injection runner.

Fig. 12 is a perspective cross-sectional view of fig. 5 taken along line C-C.

Fig. 13 is a partially enlarged view of fig. 12.

Detailed Description

As shown in fig. 1-13, an automobile bumper mold comprises a base 1, a bumper mold set 2, a blanking groove 11 and a conveying crawler 12; the bumper mould set 2 is arranged on the base, the blanking groove 11 is arranged on the base, and the conveying crawler 12 is used for conveying finished products; the bumper mould set 2 comprises a cavity shell 21, a core shell 22, a mould guide post 23, a mould guide hole 24, a separated type cavity 3, a cavity cylinder 25, a convergent type core 4, a core cylinder 26, a first sliding chute 27, a first block 28 and a fixed structure 5; the mold cavity shell 21 is fixedly connected to the base, the mold core shell 22 is slidably arranged on the base, the mold guide post 23 is arranged on the mold core shell, the mold guide hole 24 is arranged on the mold cavity shell, the separated mold cavity 3 can move back and forth in the mold cavity shell, the separated mold cavity is of a mold cavity structure capable of opening outwards, the mold cavity is divided into a plurality of pieces, demolding is achieved in a segmented mode, the mold cavity cylinder 25 is used for driving the separated mold cavity to move, the inner convergent mold core 4 can move back and forth in the mold core shell, the principle of the inner convergent mold core and the principle of the separated mold cavity are basically the same, but demolding is achieved in an inward contraction mode, the mold core cylinder 26 is used for driving the inner convergent mold core to move, the first chute 27 is arranged on the inner wall of the mold core shell, the first block 28 can move back and forth in the first chute, and the fixing structure 5 is used for fixing the first block; the first block is fixedly connected to the outer wall of the inner convergent type mold core; the core cylinder and the cavity cylinder are both of common cylinder structures and are the prior art directly purchased from the market, and the description is omitted here.

The separated cavity 3 comprises a first cavity 31, a first notch 32, a second cavity 33, a first rotating part 34, a first elastic part 35 and an air pressure demoulding structure 6; first die cavity 31 link firmly in on the die cavity cylinder, first notch 32 is located on the first block, second die cavity 33 is located in the first notch, first rotating member 34 is used for connecting first die cavity and second die cavity, first elastic member 35 is located be used for reseing in the first notch the second die cavity, first elastic member here set up to the flexure strip structure, and atmospheric pressure demoulding structure 6 is located in the second die cavity.

The pneumatic demoulding structure 6 comprises a first cavity 61, a first sliding block 62, a guide hole 63, a guide post 64, a first limit block 65, a second elastic piece 66, a first through hole 67, a vertical block 68, a second limit block 69, a blocking block 610, a third elastic piece 611, an air inlet 612, a clamping structure 7 and an extrusion structure 8; the first cavity 61 is arranged in the second cavity, the first slider 62 can move in the first cavity, the guide hole 63 is arranged on the first slider, the guide post 64 is fixedly connected to the side wall of the first cavity, the first limit block 65 is arranged on the guide post, the second elastic member 66 is sleeved on the guide post and used for resetting the first slider, the first through hole 67 is arranged on the side wall of the first cavity, the vertical block 68 is arranged in the first cavity and corresponds to the first through hole, the second limit block 69 is arranged on the vertical block, the blocking block 610 can move back and forth in the vertical block and is used for blocking the first through hole, two ends of the third elastic member 611 are fixedly connected with the blocking block and the first slider respectively, the air inlet 612 is arranged on the second cavity, the clamping structure 7 is used for fixing the blocking block, and the extrusion structure 8 is used for driving the first slider to move; the second elastic piece and the third elastic piece are both arranged in a spring structure.

The clamping structure 7 comprises a notch 71, a fixed block 72, a second cavity 73, a second sliding block 74, a fourth elastic element 75, a third cavity 76, a push plate 77, a pull rod 78, an extrusion port 79, a clamping port 710, a second through hole 711 and a push rod 712; the notch 71 is arranged on the vertical block, the fixed block 72 is arranged in the notch, the second cavity 73 is arranged in the fixed block, the second slider 74 can move back and forth in the second cavity, the fourth elastic part 75 is arranged in the second cavity and used for resetting the second slider, the fourth elastic part is arranged to be of a spring structure, the third cavity 76 is arranged on one side of the second cavity, the push plate 77 can move back and forth in the third cavity, the pull rod 78 is arranged on the push plate, the extrusion port 79 is arranged on the pull rod, the clamping port 710 is arranged on the second slider, the second through hole 711 is arranged on the side wall of the first cavity, and the push rod 712 is arranged on the first slider and corresponds to the second through hole.

The extrusion structure 8 comprises a bracket 81, a central rod 82, a rotating block 83, a chamfer 84, a receiving groove 85, a first roller 86 and an extrusion rail 87; the support 81 is arranged on the first sliding block, the central rod 82 is arranged on the support, the rotating block 83 is sleeved on the central rod, the chamfer 84 is arranged on the rotating block, the accommodating groove 85 is formed in the rotating block, the first idler wheels 86 are arranged in a plurality of positions and arranged in the accommodating groove, and the extrusion track 87 is formed in the side wall of the cavity shell.

The easy-demoulding core 4 comprises a first core 41, a bevel 411, a second notch 42, a second core 43, a second rotating part 44, a fifth elastic part 45, a step 46, an injection runner 47 and a buffer structure 9; first core 41 links firmly on the core cylinder, oblique angle 411 is located on the first core, second notch 42 set up in the core shell, second core 43 is located corresponding with first core in the second notch, second rotating member 44 is used for connecting the second core with the core shell, fifth elastic member 45 is located be used for restoring to the throne in the notch the second core, fifth elastic member here set up to the flexure strip structure, and step 46 is located first core with second core amalgamation department, the runner 47 of moulding plastics is located on the step, and buffer structure 9 locates in the first core.

The buffer structure 9 includes a fourth cavity 91, a first fixed column 92, a first rotating rod 93, a second roller 94, and a sixth elastic member 95; the fourth cavity 91 is arranged on the first mold core, the first fixed column 92 is arranged in the fourth cavity, one end of the first rotating rod 93 is rotatably sleeved on the first fixed column, the second roller 94 is arranged at the other end of the first rotating rod, and the sixth elastic piece 95 is arranged in the fourth cavity and used for resetting the first rotating rod.

The fixed structure 5 comprises a second block 51, a second sliding chute 52, a third sliding block 53, a first convex tooth 54, a fifth cavity 55, a gear 56, a second fixed column 57, a fourth sliding block 58 and a second rotating rod 59; the second block 51 is arranged above the mold core shell, the second chute 52 is arranged on the second block, the third slider 53 is arranged above the mold core shell, the first convex tooth 54 is arranged above the second chute, the fifth cavity 55 is arranged on the third slider, the gear 56 is arranged in the fifth cavity, the second fixed column 57 is arranged on the gear, the fourth slider 58 can move back and forth in the fifth cavity, and one end of the second rotary rod 59 is sleeved on the other end of the second fixed column and is rotatably connected to the fourth slider.

Preferably, an air pressure stripping structure may be provided on the second mandrel to assist stripping thereat.

The specific operation flow is as follows:

the inner convergent type mold core 4 is pushed to move through the mold core cylinder 26, the first block 28 moves in the first sliding chute 27 in the moving process, when the first block moves to the tail end, the movement of the mold core cylinder drives the movement of the mold core shell 22, the movement of the mold core shell drives the butt joint between the mold guide post 23 and the mold guide hole 24, then the movement of the mold core cylinder pushes the separated type mold cavity 3 to move into the mold cavity shell 21, in the moving process, the second mold cavity 33 and the first mold cavity 31 are spliced, the blocking block 610 closes the first through hole 67, after the butt joint is completed, injection molding is performed through the injection runner 47, after the injection molding is completed, the mold cavity cylinder is ejected outwards, the mold core cylinder 26 retracts inwards, when the separated type mold cavity 3 is exposed from the mold cavity shell, the rotating block slides along the extrusion track 87, and in the sliding process, the first block continuously moves outwards, the extrusion of the first block is gradually reduced, so that the third elastic member 66 pulls the blocking block 610 to move out of the first through hole 67 along the vertical block, so that the gas in the first cavity transmits high-pressure airflow to the product along the first through hole to assist the demolding of the product, and at the same time, the air cooling is performed on the surface of the product during the demolding, so that the cooling and fixing of the product are accelerated, the completely-shaped speed of the product is accelerated, when the second cavity 33 moves to a certain degree, the second cavity loses the limit of the cavity shell to the second cavity, so that the second cavity is opened outwards under the action of the first elastic member 35, so that the first cavity 31 and the second cavity 33 are separated, the second cavity is separated in a manner of rotating around the first rotating member 34, the demolding on both sides of the bumper is completed, and then the separation of the core is realized to completely separate the cavity from the product, and then the separation of the core from the product is carried out, first core 41 is at the removal in-process, the preferred horizontal bar position drawing of patterns to the bumper, this moment because the both ends of bumper receive the support of second core 43, thereby it is more convenient complete to demold, break away from each other between the in-process first core of demolding and the second core, the runner of moulding plastics originally has the amalgamation between first core and the second core to constitute, the removal of first core will make the bottom of the runner of moulding plastics lose the support this moment, when first core removes, the runner 47 of moulding plastics will lose the support, and the material in the runner of moulding plastics can drop, the material after the shedding will be finally sent out the base along conveying track 12, repeat above-mentioned flow.

While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An automobile bumper mould comprises a base (1), a bumper mould group (2) arranged on the base, a blanking groove (11) arranged on the base and a conveying crawler (12) used for conveying finished products; the method is characterized in that: the bumper mould set (2) comprises a cavity shell (21) fixedly connected to the base, a core shell (22) slidably arranged on the base, mould guide columns (23) arranged on the core shell, mould guide holes (24) arranged on the cavity shell, a separated type cavity (3) capable of moving back and forth in the cavity shell, a cavity cylinder (25) used for driving the separated type cavity to move, an inner converging type core (4) capable of moving back and forth in the core shell, a core cylinder (26) used for driving the inner converging type core to move, a first sliding groove (27) formed in the inner wall of the core shell, a first block (28) capable of moving back and forth in the first sliding groove and a fixing structure (5) used for fixing the first block; the first block is fixedly connected to the outer wall of the inner convergent type mold core;

the separated type cavity (3) comprises a first cavity (31) fixedly connected to the cavity cylinder, a first notch (32) arranged on the first cavity (31), a second cavity (33) arranged in the first notch, a first rotating piece (34) used for connecting the first cavity and the second cavity, a first elastic piece (35) arranged in the first notch and used for resetting the second cavity, and an air pressure demoulding structure (6) arranged in the second cavity;

the air pressure demoulding structure (6) comprises a first cavity (61) arranged in the second cavity, a first sliding block (62) capable of moving in the first cavity, a guide hole (63) arranged on the first sliding block, a guide post (64) fixedly connected on the side wall of the first cavity, a first limit block (65) arranged on the guide post, a second elastic piece (66) sleeved on the guide post and used for resetting the first sliding block, a first through hole (67) arranged on the side wall of the first cavity, a stand block (68) arranged in the first cavity and corresponding to the first through hole, a second limit block (69) arranged on the stand block, a blocking block (610) capable of moving back and forth in the stand block and used for blocking the first through hole, a third elastic piece (611) with two ends respectively fixedly connected with the blocking block and the first sliding block, an air inlet (612) arranged on the second cavity, a clamping structure (7) used for fixing the blocking block, and an extrusion structure (8) used for driving the first sliding block to move;

the clamping structure (7) comprises a notch (71) arranged on the vertical block, a fixed block (72) arranged in the notch, a second cavity (73) arranged in the fixed block, a second sliding block (74) capable of moving back and forth in the second cavity, a fourth elastic part (75) arranged in the second cavity and used for resetting the second sliding block, a third cavity (76) arranged on one side of the second cavity, a push plate (77) capable of moving back and forth in the third cavity, a pull rod (78) arranged on the push plate, an extrusion opening (79) arranged on the pull rod, a clamping opening (710) arranged on the second sliding block, a second through hole (711) arranged on the side wall of the first cavity, and a push rod (712) arranged on the first sliding block and corresponding to the second through hole;

the extrusion structure (8) comprises a support (81) arranged on the first sliding block, a central rod (82) arranged on the support, a rotating block (83) sleeved on the central rod, a chamfer (84) arranged on the rotating block, an accommodating groove (85) formed in the rotating block, a plurality of first rollers (86) arranged in the accommodating groove, and an extrusion track (87) formed in the side wall of the cavity shell;

the inner convergent type mold core (4) comprises a first mold core (41) fixedly connected to the mold core cylinder, an oblique angle (411) arranged on the first mold core, a second notch (42) arranged in the mold core shell, a second mold core (43) arranged in the second notch and corresponding to the first mold core, a second rotating piece (44) used for connecting the second mold core and the mold core shell, a fifth elastic piece (45) arranged in the notch and used for resetting the second mold core, a step (46) arranged at the splicing position of the first mold core and the second mold core, an injection molding flow channel (47) arranged on the step, and a buffer structure (9) arranged in the first mold core;

the buffer structure (9) comprises a fourth cavity (91) arranged on the first mold core, a first fixed column (92) arranged in the fourth cavity, a first rotating rod (93) with one end rotatably sleeved on the first fixed column, a second roller (94) arranged at the other end of the first rotating rod, and a sixth elastic piece (95) arranged in the fourth cavity and used for resetting the first rotating rod;

the fixing structure (5) comprises a second block body (51) arranged above the core shell, a second sliding groove (52) arranged on the second block body, a third sliding block (53) arranged above the core shell, a first convex tooth (54) arranged above the second sliding groove, a fifth cavity (55) arranged on the third sliding block, a gear (56) arranged in the fifth cavity, a second fixing column (57) arranged on the gear, a fourth sliding block (58) capable of moving back and forth in the fifth cavity, and a second rotating rod (59) with one end sleeved on the other end of the second fixing column and rotatably connected to the fourth sliding block.