CN120038259A - Cold forming die and cold forming process for hardware bushing of automobile door system - Google Patents

Abstract

The invention is applicable to the technical field of manufacturing of rivet nuts, and provides a cold forming die and a cold forming process of a hardware bushing of an automobile door system, wherein a preformed piece h is subjected to full-closed forward extrusion deformation at a first station to form a preformed piece a; the method comprises the steps of turning a preformed piece a, forward extrusion, extruding a large hole at a riveting end to form a thin wall to form a preformed piece b, finishing upsetting forming of straight teeth by forward extrusion at a third station, finishing first forming of a rim and a tooth-shaped part to form a preformed piece c, extruding and upsetting the outer diameters of heads at two ends of a fourth station to form a preformed piece d, extruding and upsetting heads at two ends of a fifth station to simultaneously stretch inner holes at two ends to form a preformed piece e, extruding and upsetting heads at two ends of the sixth station to simultaneously stretch the inner holes at two ends, reversely extruding a large bell mouth at one time to form a preformed piece f, and extruding waste in the middle of the preformed piece f instantly when the seventh station is punched into the inner holes of the preformed piece f to form a finished product piece g. Thereby, the invention realizes the improvement of efficiency and the reduction of cost.

Description

Cold forming die and cold forming process for hardware bushing of automobile door system

Technical Field

The invention relates to the technical field of manufacturing of rivet nuts, in particular to a cold forming die and a cold forming process of an automobile door system hardware bushing.

Background

In the cold forming of the hardware lining member of the automobile door system, because the product structure is special, the rims are arranged at the two ends, the sizes phi 11 and phi 14 of the rims at the two ends are larger than the size phi 10.5 of the middle spline part, the whole production is carried out on the existing cold upsetting equipment, one-step forming is not too difficult, two working procedures of the cold upsetting working procedure pressurizing riveting (horn mouth pressing) working procedure are adopted at present, the first step is that one end rim is preformed by cold upsetting extrusion, and the other end rim is formed by riveting, and the forming process has the following defects that because the cold upsetting preforming is needed, the two working procedures are needed for production, the two preparation working hours and the two working hours are needed, the production efficiency is low, the production cost is high, and the economic value maximization cannot be realized.

In summary, the prior art has obvious inconvenience and defects in practical use, so that improvement is needed.

Disclosure of Invention

Aiming at the defects, the invention aims to provide a cold forming die and a cold forming process for an automobile door system hardware bushing, which can simultaneously finish cold heading preforming and riveting final forming in the cold heading process, thereby improving the efficiency and reducing the cost.

In order to achieve the above purpose, the invention provides a cold forming die of an automobile door system hardware bushing, which comprises a first station, a second station, a third station, a fourth station, a fifth station, a sixth station and a seventh station for forming a forging piece in sequence;

The first station comprises a first station male die and a first station female die, the first station male die comprises a first male die sleeve, a first pre-stamping die core is arranged inside one end of the first male die sleeve in a penetrating mode, a first cushion block is arranged at the other end of the first male die sleeve, the first station female die comprises a first stroke die, a first back stamping rod is arranged inside the first stroke die in a penetrating mode, the first stroke die is in clearance fit with the first back stamping rod and forms a first die opening, a first back sleeve head is sleeved at one end of the first back stamping rod, the first station male die is fixed on a cold header through the first male die sleeve, the first station female die is fixed on the cold header through the first stroke die, a preformed part h is sent to the first die opening, the first pre-stamping die core moves towards the first station female die, the first back stamping rod moves towards the first die opening to a preset position, and the preformed part h is extruded and deformed to form a preformed part a die;

The second station comprises a second station male die and a second station female die, the second station male die comprises a second male die sleeve, a second front punch rod is arranged in one end of the second male die sleeve in a penetrating manner, a second cushion block is arranged at the other end of the second male die sleeve, the second station female die comprises a second stroke die, a second rear punch rod is arranged in the second stroke die in a penetrating manner, the second stroke die is in clearance fit with the second rear punch rod and forms a second die opening, a second rear punch rod pipe, a second annular cushion block, a second three-hole seat cushion block, a second stroke die rear cushion and a second three-hole seat ejector pin are sleeved at one end of the second rear punch rod in sequence, the second station male die is fixed on a cold header through the second male die sleeve, the second station female die is fixed on the cold header through the second stroke die, a preformed part a is sent to the second die opening, the second front punch rod moves towards the second station female die, and the second rear punch rod moves towards a preset position b to form a preformed part;

The third station comprises a third station male die and a third station female die, the third station male die comprises a third male die sleeve, a third front punch rod is arranged in one end of the third male die sleeve in a penetrating manner, a third cushion block is arranged at the other end of the third male die sleeve, the third station female die comprises a third stroke die, a third rear punch rod is arranged in the third stroke die in a penetrating manner, the third stroke die and the third rear punch rod are in clearance fit and form a third die opening, a third rear punch rod pipe, a third annular cushion block, a third three-hole seat cushion block, a third stroke die rear cushion and a third three-hole seat ejector pin are sleeved at one end of the third rear punch rod in sequence, the third station male die is fixed on a cold header through the third male die sleeve, the third station female die is fixed on the cold header through the third stroke die, a preformed part b is sent to the third die opening, the third front punch rod moves towards the third station female die, and the third rear punch rod moves towards a preset position b to form a preformed part;

The fourth station male die comprises a fourth station male die and a fourth station female die, the fourth station male die comprises a fourth male die sleeve, a fourth front punch rod is arranged inside one end of the fourth male die sleeve in a penetrating manner, a fourth cushion block is arranged at the other end of the fourth male die sleeve, the fourth station female die comprises a fourth stroke die, a fourth rear punch rod is arranged inside the fourth stroke die in a penetrating manner, the fourth stroke die and the fourth rear punch rod are in clearance fit and form a fourth die orifice, a fourth rear punch rod tube, a fourth annular cushion block, a fourth three-hole seat cushion block, a fourth stroke die rear cushion and a fourth three-hole seat ejector pin are sequentially sleeved at one end of the fourth rear punch rod, the fourth male die is fixed on a cold header through the fourth male die sleeve, the fourth station female die is fixed on the cold header through the fourth stroke die, a preformed piece c is sent to the fourth orifice, the fourth front punch rod moves to the fourth station female die, and the fourth front punch rod moves to the fourth position in the fourth direction, and the preformed piece c moves to the fourth position to form a preset deformation forming position;

The fifth station comprises a fifth station male die and a fifth station female die, the fifth station male die comprises a fifth male die sleeve, a fifth front punch rod is arranged in one end of the fifth male die sleeve in a penetrating manner, a fifth cushion block is arranged at the other end of the fifth male die sleeve, the fifth station female die comprises a fifth stroke die, a fifth rear punch rod is arranged in the fifth stroke die in a penetrating manner, the fifth stroke die and the fifth rear punch rod are in clearance fit and form a fifth die opening, one end of the fifth rear punch rod is sequentially sleeved with a fifth rear punch rod pipe, a fifth annular cushion block, a fifth three-hole seat cushion block, a fifth stroke die rear cushion and a fifth three-hole seat ejector pin, the fifth station male die is fixed on a cold header through the fifth male die sleeve, the fifth station female die is fixed on the cold header through the fifth stroke die, a preformed part d is sent to the fifth die opening, the fifth front punch rod moves towards the fifth station, the fifth rear punch rod moves towards a preset position in the direction of the preformed part d, and forms a preformed part;

The sixth station comprises a sixth station male die and a sixth station female die, the sixth station male die comprises a sixth male die sleeve, a sixth front punch rod is arranged in one end of the sixth male die sleeve in a penetrating manner, a sixth cushion block is arranged at the other end of the sixth male die sleeve, the sixth station female die comprises a sixth stroke die, a sixth rear punch rod is arranged in the sixth stroke die in a penetrating manner, the sixth stroke die and the sixth rear punch rod are in clearance fit and form a sixth die opening, a sixth rear sleeve head is sleeved at one end of the sixth rear punch rod, the sixth station male die is fixed on a cold header through the sixth male die sleeve, the sixth station female die is fixed on the cold header through the sixth stroke die, a preformed part e is sent to the sixth die opening, the sixth front punch rod moves towards the sixth female die station, the sixth rear punch rod moves towards the sixth die opening to a preset position, and the preformed part e is extruded and deformed to form a preformed part f;

The seventh station comprises a seventh station male die and a seventh station female die, the seventh station male die comprises a seventh male die sleeve, a punching rod penetrates through one end of the seventh male die sleeve, a seventh cushion block is arranged at the other end of the seventh male die sleeve, the seventh station female die comprises a punching die core, the seventh station male die is fixed on a cold header through the seventh male die sleeve, a preformed piece f is sent to one end of the punching die core, the punching rod moves towards the punching die core to remove the connecting skin in the middle of the preformed piece f to form a through hole, and a finished product piece g is formed.

The cold forming die for the hardware bushing of the automobile door system further comprises a conveying device for clamping castings to sequentially pass through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station.

According to the cold forming die for the hardware bushing of the automobile door system, the first station male film is of a movable combined structure;

the second station male membrane is of a movable combined structure;

the third station male membrane is of a movable combined structure;

The fourth station positive film is of a movable combined structure;

the fifth station male membrane is of a movable combined structure;

The sixth station male membrane is of a movable combined structure;

the seventh station male membrane is of a movable combined structure.

According to the cold forming die for the hardware bushing of the automobile door system, the first station female die is of a prestress combined sleeve die structure;

the second station female die is of a prestress combined sleeve die structure.

According to the cold forming die for the hardware bushing of the automobile door system, the preformed piece h is a plastic piece, and the cold forming die is a rigid body.

According to the cold forming die for the hardware bushing of the automobile door system, the temperature of the cold forming die is 20 ℃, and the friction factor of the cold forming die is 0.08.

According to the cold forming die for the hardware bushing of the automobile door system, the first station is made of hard alloy materials and hot working die steel in an interference fit mode;

the second station is made of hard alloy materials and hot work die steel in an interference fit manner;

The third station is made of hard alloy materials and hot work die steel in interference fit;

the fourth station is made of hard alloy materials and hot work die steel in an interference fit manner;

the fifth station is made of hard alloy materials and hot work die steel in an interference fit manner;

The sixth station is made of hard alloy materials and hot work die steel in an interference fit mode;

the seventh station is made of hard alloy materials and hot working die steel in an interference fit mode.

According to the cold forming die of the hardware bushing of the automobile door system, the rim sizes of two ends of the finished part g are phi 11 and phi 14 respectively.

According to the cold forming die of the automobile door system hardware bushing, the size of the middle spline of the finished part g is phi 10.5.

A cold forming process of an automotive door system hardware bushing, comprising the steps of:

S0, blanking, and cutting out a rivet nut as a preformed piece h;

S1, performing full-closed forward extrusion deformation on a preform h by utilizing a first station, and eliminating tearing to form a preform a;

S2, overturning the preformed piece a by utilizing a second station, and stretching the large hole of the press riveting end to form a thin wall by forward extrusion to form a preformed piece b;

S3, forward extruding the preformed piece b by utilizing a third station to finish upsetting forming of straight teeth, and finishing first forming of the rim and the tooth-shaped part to form a preformed piece c;

s4, extruding and upsetting the outer diameter of the head at the two ends of the preformed piece c by utilizing a fourth station to finish the final forming of the rim and the second forming of the tooth-shaped part to form a preformed piece d;

s5, extruding upsets at two ends of the preform d simultaneously and stretching inner holes at two ends simultaneously by utilizing a fifth station to form a preform e;

s6, extruding upsets at two ends of the preformed piece e simultaneously by utilizing a sixth station, and reversely extruding to forge a large bell mouth at one time when inner holes are stretched at the two ends, so that the final forming of the rim size is completed, and a preformed piece f is formed;

s7, instantly extruding waste in the middle of the preformed piece f when the seventh station is used for flushing the inner hole of the preformed piece f, and conveying the preformed piece f and the waste from different channels after the waste is completed to form a finished product piece g.

The invention discloses a method for forming a finished product of a plastic material, which comprises the steps of carrying out full-closed forward extrusion deformation on a preformed piece h through a first station to eliminate tearing, overturning the preformed piece a through a second station, forward extruding and stretching a large hole at a riveting end to form a thin wall to form a preformed piece b, forward extruding the preformed piece b through a third station to finish the upsetting forming of straight teeth, finishing the first forming of a rim and a toothed part to form a preformed piece c, simultaneously extruding and upsetting the two ends of the preformed piece c through a fourth station to finish the second forming of the rim and the toothed part to form a preformed piece d, simultaneously extruding and upsetting the two ends of the preformed piece d through a fifth station to simultaneously stretch an inner hole to form a preformed piece e, simultaneously extruding and upsetting the two ends of the preformed piece e through a sixth station to reversely extrude a large bell mouth at one time when the two ends of the preformed piece e stretch the inner hole to finish the rim size, instantly extruding waste materials in the middle of the preformed piece f when the seventh station is used for punching the inner hole of the preformed piece f, and conveying the finished product f from different channels to form the waste materials g. Therefore, the cold forming die and the cold forming process of the hardware bushing of the automobile door system can simultaneously finish cold heading preforming and riveting final forming in the cold heading process, thereby improving the efficiency and reducing the cost.

Drawings

FIG. 1 is a schematic structural view of a preform h of an automotive door system hardware bushing of the present invention;

FIG. 2 is a schematic illustration of the sequential forming of the hardware bushings of the automotive door system hardware bushing of the present invention;

FIG. 3 is a schematic view of the structure of a first station in an automotive door system hardware bushing of the present invention;

FIG. 4 is a schematic illustration of a second station in an automotive door system hardware bushing of the present invention;

FIG. 5 is a schematic illustration of the structure of a third station in an automotive door system hardware bushing of the present invention;

FIG. 6 is a schematic illustration of a fourth station in an automotive door system hardware bushing of the present invention;

FIG. 7 is a schematic illustration of a fifth station in an automotive door system hardware bushing of the present invention;

FIG. 8 is a schematic illustration of a sixth station in an automotive door system hardware bushing of the present invention;

FIG. 9 is a schematic illustration of a seventh station in the automotive door system hardware bushing of the present invention;

FIG. 10 is a metal flow diagram of a first station in an automotive door system hardware bushing of the present invention;

FIG. 11 is a metal flow diagram of a second station in an automotive door system hardware bushing of the present invention;

FIG. 12 is a metal flow diagram of a third station in the automotive door system hardware bushing of the present invention;

FIG. 13 is a metal flow diagram of a fourth station in the automotive door system hardware bushing of the present invention;

FIG. 14 is a metal flow diagram of a fifth station in an automotive door system hardware bushing of the present invention;

FIG. 15 is a metal flow diagram of a sixth station in an automotive door system hardware bushing of the present invention;

FIG. 16 is a load distribution diagram of a first station in an automotive door system hardware bushing of the present invention;

FIG. 17 is a load distribution diagram of a second station in an automotive door system hardware bushing of the present invention;

FIG. 18 is a load distribution diagram of a third station in an automotive door system hardware bushing of the present invention;

FIG. 19 is a load distribution diagram of a fourth station in an automotive door system hardware bushing of the present invention;

FIG. 20 is a load distribution diagram of a fifth station in an automotive door system hardware bushing of the present invention;

FIG. 21 is a load distribution diagram of a sixth station in an automotive door system hardware bushing of the present invention;

FIG. 22 is an equivalent stress diagram of a first station in an automotive door system hardware bushing of the present invention;

FIG. 23 is an equivalent stress diagram of a second station in an automotive door system hardware bushing of the present invention;

FIG. 24 is an equivalent stress diagram of a third station in an automotive door system hardware bushing of the present invention;

FIG. 25 is an equivalent stress diagram of a fourth station in an automotive door system hardware bushing of the present invention;

FIG. 26 is an equivalent stress diagram of a fifth station in an automotive door system hardware bushing of the present invention;

FIG. 27 is an equivalent stress diagram of a sixth station in an automotive door system hardware bushing of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1 and 2, the invention provides a technical scheme that the sizes of rims at two ends of a hardware bushing of an automobile door system are phi 11 and phi 14 respectively, the sizes of middle spline teeth are phi 10.5, a cold forming die of the hardware bushing of the automobile door system comprises a first station, a second station, a third station, a fourth station, a fifth station, a sixth station and a seventh station which are used for forging piece forming in sequence, a preform h of a rivet nut is subjected to full-closed forward extrusion deformation in the first station, tearing is eliminated, a preform a is formed, the preform a is conveyed to the second station by utilizing a conveying device, the preform a is overturned in the second station, the second station positively extrudes the rivet end macropores to form thin walls, the preform b is conveyed to the third station by utilizing the conveying device, the preform b is positively extruded to finish the upsetting of straight teeth in the third station, the rims and tooth-shaped parts are formed into first time, the preform c is formed by utilizing the conveying device, the preform c is conveyed to the fourth station, the two ends of the preform c are simultaneously extruded to finish the two ends in the fourth station, the preform d is extruded by utilizing the conveying device, the inner diameters of the preform c is simultaneously extruded to finish the two ends in the fourth station, and the two ends of the preform d are simultaneously extruded by utilizing the conveying device, and the two ends of the preform d are simultaneously extruded in the fourth station, and the two ends of the preform d are simultaneously extruded and the two ends are extruded and simultaneously extruded by utilizing the conveying device, the four ends are simultaneously extruded to form the preform b and the straight tooth is extruded and the straight tooth-shaped, and the tooth is formed. And conveying the preformed piece f to a seventh station by utilizing a conveying device, wherein the preformed piece f is flushed into an inner hole of the preformed piece f by the seventh station and instantly squeezes waste in the middle of the preformed piece f, after the preformed piece f is completed, the preformed piece f and the waste are conveyed from different channels to form a finished product g, and in addition, the preformed piece conveying among the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station can be manually clamped or conveyed by utilizing a conveying device, so that the conveying device further comprises a conveying device for clamping castings to sequentially pass through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station, and the conveying device can select any one of the prior art to realize clamping conveying effect, so that the clamping conveying effect is not shown in the figure and the technical scheme.

Referring to fig. 3, a rivet nut is taken as a preformed part h, the preformed part h is subjected to full-closed positive extrusion deformation by utilizing a first station 1, tearing is eliminated, a preformed part a is formed, the first station 1 comprises a first station male die and a first station female die, the first station male die comprises a first male die sleeve 11, a first pre-stamping die core 12 is penetrated and arranged in one end of the first male die sleeve 11, the first male die sleeve 11 and the first pre-stamping die core 12 are in clearance fit, a first cushion block 13 is arranged at the other end of the first male die sleeve 11, the first station female die comprises a first stroke die 14, a first back punch 15 is penetrated and arranged in the first stroke die 14, the first stroke die 14 and the first back punch 15 are in clearance fit, a first back punch 15 is sleeved with a first back die head 16, the first station male die is fixed on a cold punch through the first male die sleeve 11, the first station female die is fixed on the cold punch, the first main die core is driven to move to the first main die 12 through the first stroke die core through the first female die sleeve 14, the first main punch 12 is driven to move to the first main die core 12 to the right side of the first cold punch die 12, when the first main die core is driven to move to the first main die 12, a first main die 12 is driven to the first main die 12, a first die core is continuously moves to the first main die core 12 is driven to the first main die 12, and a main die 12 is deformed, a first mandrel is driven to be a main die h is formed, a first mandrel is continuously, a first mandrel is formed, the first back punch 15 moves to a preset position in the direction of the first die orifice, and the preformed piece h is subjected to upsetting extrusion deformation to form a preformed piece a;

Referring to fig. 4, the preform a is turned over by using the second station 2, and the large hole at the squeeze riveting end is stretched to form a thin wall by forward extrusion to form a preform b; the second station 2 comprises a second station male die and a second station female die, the second station male die comprises a second male die sleeve 21, a second front punch 22 is penetrated and arranged inside one end of the second male die sleeve 21, the second front punch 22 is in clearance fit with the second male die sleeve 21, a second cushion block 23 is arranged at the other end of the second male die sleeve 21, the second station female die comprises a second stroke die 24, a second rear punch 25 is penetrated and arranged inside the second stroke die 24, the second stroke die 24 is in clearance fit with the second rear punch 25 to form a second die orifice, one end of the second rear punch 25 is sequentially sleeved with a second rear punch tube 26, a second annular cushion block 27, a second third hole seat cushion block 28, a second stroke die rear cushion 29 and a second third hole seat thimble 210, the second station male die is fixed on a cold header through the second male die sleeve 21, the second station female die is fixed on the female die machine through the second stroke die 24, a second punch is driven by the second die 24 to move to a second front punch die sleeve 22 and a second main punch, a second main punch is driven to move to a second front punch 22, a side of the second die is driven to form a main die, a main die is driven to move in the same direction as the second main die 22, when the second front punch 22 moves forward to the forefront point under the drive of the main slide block, the second rear punch 25 moves to a preset position in the direction of the second die orifice, and the preformed piece a is deformed by upsetting extrusion to form a preformed piece b;

Referring to fig. 5, the preform b is forward extruded by the third station 3 to finish the upsetting forming of the straight teeth, and the first forming of the rim and the tooth-shaped portion is finished to form a preform c; the third station 3 comprises a third station male die and a third station female die, the third station male die comprises a third male die sleeve 31, a third front punch rod 32 is arranged inside one end of the third male die sleeve 31 in a penetrating manner, the third front punch rod 32 is in clearance fit with the third male die sleeve 31, a third cushion block 33 is arranged at the other end of the third male die sleeve 31, the third station female die comprises a third stroke die 34, a third rear punch rod 35 is arranged inside the third stroke die 34 in a penetrating manner, the third stroke die 34 and the third rear punch rod 35 are in clearance fit manner and form a third die opening, one end of the third rear punch rod 35 is sequentially sleeved with a third rear punch rod pipe 36, a third annular cushion block 37, a third hole seat cushion block 38, a third stroke die rear cushion block 39 and a third hole seat thimble 310, the third station male die is fixed on a cold header through the third male die sleeve 31, the third station female die is fixed on the female die through the third stroke die 34, the third punch rod is driven by the third punch die 34 to move to the same side of the third header, the third punch rod is driven to the same as the third punch rod 32 in the direction, the second main punch rod is driven to move to the second side of the die 32, and the second main punch rod is driven to move to the same side of the die 32, when the third front punch 32 moves forward to the forefront point under the drive of the main slide block, the third back punch 35 moves to a preset position in the direction of the third die orifice, and the preformed piece b is deformed by upsetting extrusion to form a preformed piece c;

Referring to fig. 6, both ends of the preform c are simultaneously extruded and headed for the outer diameter of the head by the fourth station 4 to finish the final forming of the rim and the second forming of the tooth-shaped portion to form a preform d; the fourth station 4 comprises a fourth station male die and a fourth station female die, the fourth station male die comprises a fourth male die sleeve 41, a fourth front punch rod 42 is penetrated and arranged in one end of the fourth male die sleeve 41, the fourth front punch rod 42 is in clearance fit with the fourth male die sleeve 41, a fourth cushion block 43 is arranged in the other end of the fourth male die sleeve 41, the fourth station female die comprises a fourth stroke die 44, a fourth rear punch rod 45 is penetrated and arranged in the fourth stroke die 44, the fourth stroke die 44 is in clearance fit with the fourth rear punch rod 45 to form a fourth die orifice, a fourth rear punch rod pipe 46, a fourth annular cushion block 47, a fourth three-hole seat cushion block 48, a fourth stroke die rear cushion block 49 and a fourth three-hole seat thimble 410 are sequentially sleeved at one end of the fourth rear punch rod 45, the fourth working position male die is fixed on the cold header through the fourth male die sleeve 41, the fourth working position female die is fixed on the cold header through the fourth stroke die 44, the fourth working position female die is locked with the fourth stroke die 44 through a locking nut and then fixed on the cold header together with the fourth stroke die 44, during deformation, a conveying device conveys a preformed piece c to the fourth die opening, a main slide block of the cold header drives a fourth front punch 42 of a left fourth working position male die to move towards the fourth working position female die, the preformed piece c is ejected into the fourth die opening on the right side under the action of the fourth front punch 42, two ends of the preformed piece c are fixed on the same central axis of the fourth working position male die and the fourth working position female die, the main slide block of the cold header drives the fourth front punch 42 to continuously move towards the fourth working position female die, when the fourth front punch 42 moves forward to the forefront point under the drive of the main slider, the fourth rear punch 45 moves to a predetermined position in the fourth die direction, and the preform c is deformed by upsetting extrusion to form a preform d;

Referring to fig. 7, the preform e is formed by simultaneously extruding the upsets at both ends and simultaneously stretching the inner holes at both ends of the preform d using the fifth station 5; the fifth station 5 comprises a fifth station male die and a fifth station female die, the fifth station male die comprises a fifth male die sleeve 51, a fifth front punch 52 is penetrated and arranged in one end of the fifth male die sleeve 51, the fifth front punch 52 is in clearance fit with the fifth male die sleeve 51, a fifth cushion block 53 is arranged in the other end of the fifth male die sleeve 51, the fifth station female die comprises a fifth stroke die 54, a fifth rear punch 55 is penetrated and arranged in the fifth stroke die 54, the fifth stroke die 54 is in clearance fit with the fifth rear punch 55 to form a fifth die orifice, one end of the fifth rear punch 55 is sequentially sleeved with a fifth rear punch pipe 56, a fifth annular cushion block 57, a fifth third hole seat cushion block 58, a fifth stroke die rear cushion 59 and a fifth third hole seat thimble 510, the fifth station male die is fixed on the cold header through the fifth male die sleeve 51, the fifth station female die is fixed on the cold header through the fifth stroke die 54, the fifth station female die is locked with the fifth stroke die 54 through a lock nut and then fixed on the cold header through the fifth stroke die 54, during deformation, a conveying device conveys a preformed piece d to the fifth die opening, a main slide block of the cold header drives a fifth front punch rod 52 of the left fifth station male die to move towards the fifth station female die, the preformed piece d is jacked into a fifth die opening on the right side under the action of the fifth front punch rod 52, two ends of the preformed piece d are fixed on the same central axis of the fifth station male die and the fifth station female die, the main slide block of the cold header drives the fifth front punch rod 52 to continuously move towards the direction of the fifth station female die, when the fifth front punch 52 moves forward to the forefront point under the drive of the main slider, the fifth rear punch 55 moves to a predetermined position in the direction of the fifth die orifice, and the preform d is deformed by upsetting extrusion to form a preform e;

Referring to fig. 8, the sixth station 6 is utilized to simultaneously extrude the upsets at two ends of the preform e, and the large bell mouth is reversely extruded at one time when the inner holes are stretched at the two ends, so that the final forming of the rim size is completed, and the preform f is formed; the sixth station 6 comprises a sixth station male die and a sixth station female die, the sixth station male die comprises a sixth male die sleeve 61, a sixth front punch 62 is penetrated and arranged in one end of the sixth male die sleeve 61, the sixth front punch 62 is in clearance fit with the sixth male die sleeve 61, a sixth cushion block 63 is arranged in the other end of the sixth male die sleeve 61, the sixth station female die comprises a sixth stroke die 64, a sixth rear punch 65 is penetrated and arranged in the sixth stroke die 64, the sixth stroke die 64 is in clearance fit with the sixth rear punch 65 to form a sixth die orifice, a sixth rear die sleeve 66 is sleeved at one end of the sixth rear punch 65, the sixth station male die is fixed on a cold header through the sixth male die sleeve 61, the sixth station female die is fixed on the cold header through the sixth stroke die 64, the sixth station female die is locked with the sixth stroke die 64 through a lock nut and then fixed on the cold header together with the sixth stroke die 64, when the cold header is deformed, the conveying device conveys the preformed piece e to the sixth die port, the main slide block of the cold header drives the sixth front punch 62 of the left sixth station male die to move towards the sixth station female die, the preformed piece e is jacked into the right sixth die port under the action of the sixth front punch 62, the two ends of the preformed piece e are fixed on the same central axis of the sixth station male die and the sixth station female die, the main slide block of the cold header drives the sixth front punch 62 to continuously move towards the sixth station female die, when the sixth front punch 62 moves forwards to the forefront point under the drive of the main slide block, the sixth back punch 65 moves to a preset position in the direction of the sixth die orifice, and the preform e is subjected to upsetting extrusion deformation to form a preform f;

Referring to fig. 9, when the seventh station 7 is used to punch the inner hole of the preform f, the waste in the middle of the preform f is instantaneously squeezed out, after the completion, the preform f and the waste 75 are transported from different channels to form a finished product g, the seventh station 7 comprises a seventh station male die and a seventh station female die, the seventh station male die comprises a seventh male die sleeve 71, a punching punch 72 is penetrated and arranged in one end of the seventh male die sleeve 71, the punching punch 72 is in clearance fit with the seventh male die sleeve 71, a seventh cushion block 73 is arranged at the other end of the seventh male die sleeve 71, the seventh station female die comprises a punching die core 74, the seventh station male die is fixed on a cold header through the seventh male die sleeve 71, when the preform f is deformed, a transport device transports the preform f to one end of the punching die core 74, the preform f is under the action of the punching punch 72, two ends of the preform f are fixed on the same central axis of the seventh station and the seventh female die sleeve 71, the punching punch is driven by the seventh station female die sleeve 74 to move to the position from the left side of the cold header to the preset position, and the waste is transported to the front of the punch die core 74 when the preform is driven to move to the front of the punch die sleeve 72, and the front of the preform is transported to the pre-forming the pre-punch core 74.

Preferably, the device further comprises a conveying device for sequentially clamping the castings through the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station, and the conveying device can be any one of the prior art and can realize clamping and conveying effects, so that the conveying device is not shown in the drawings and the technical scheme.

The first station positive film is of a movable combined structure, the second station positive film is of a movable combined structure, the third station positive film is of a movable combined structure, the fourth station positive film is of a movable combined structure, the fifth station positive film is of a movable combined structure, the sixth station positive film is of a movable combined structure, and the seventh station positive film is of a movable combined structure, and the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station are formed by interference fit of hard alloy materials G50 and hot work die steel H13/SKH-55 respectively.

Preferably, the first station female die is of a prestress combined sleeve die structure, and the second station female die is of a prestress combined sleeve die structure.

Preferably, the preform h is a plastic part and the cold forming die is a rigid body.

Preferably, the temperature of the cold forming die is 20 degrees celsius, and the friction factor of the cold forming die is 0.08.

Preferably, the first station is made of a hard alloy material and hot work die steel in an interference fit, the second station is made of a hard alloy material and hot work die steel in an interference fit, the third station is made of a hard alloy material and hot work die steel in an interference fit, the fourth station is made of a hard alloy material and hot work die steel in an interference fit, the fifth station is made of a hard alloy material and hot work die steel in an interference fit, the sixth station is made of a hard alloy material and hot work die steel in an interference fit, the seventh station is made of a hard alloy material and hot work die steel in an interference fit, the hard alloy material is G50, and the hot work die steel is H13/SKH-55.

Preferably, the rim dimensions of the two ends of the finished piece g are phi 11 and phi 14, respectively.

Preferably, the intermediate tooth of the finished piece g has a dimension phi 10.5.

The invention sequentially completes modeling assembly of the first station, the second station, the third station, the fourth station, the fifth station, the sixth station and the seventh station by means of SD software, takes the simulation result of the first station as the initial condition of the second station, takes the simulation result of the second station as the initial condition of the third station, and so on, and leads the simulation result into a form-3D for numerical calculation. The preform h was defined as a plastic body, the mold as a rigid body, the cold heading temperature was 20 ℃ irrespective of elastic deformation, the friction type was selected as Shear, and the friction factor was 0.08. By establishing a Johnson-Cook model to analyze stress strain conditions of all stations, referring to metal flow diagrams of all stations in fig. 10-15, it can be seen that the deformation of the parts of all stations is reasonably distributed, the flow lines of the formed parts are continuous and uniform, no metal flow confluence phenomenon exists in the inside, the smooth and steady flow of the parts can be judged, no folding defect is found, and referring to equivalent stress diagrams of all stations in fig. 22-27, the equivalent stress of all stations is in the range of 700+/-20 MPa, which indicates that the deformation of all stations of the parts is relatively balanced, the stress of products is balanced, the forming is facilitated, and referring to the load distribution diagrams of all stations in fig. 16-21, the overall change trend is approximately alternate, the load difference of all stations is not great, the stress of all station dies is relatively balanced, the service life of the dies is close, and the whole replacement of cold heading dies is facilitated.

In summary, the invention performs full-closed forward extrusion deformation on a preformed piece h through a first station to eliminate tearing to form a preformed piece a, performs overturning on the preformed piece a through a second station, forward extrudes the upsetting end macropores to form thin walls to form a preformed piece b, forward extrudes the preformed piece b through a third station to finish upsetting forming of straight teeth, finish forming of a rim and a toothed part for the first time to form a preformed piece c, simultaneously extrudes and upsets two ends of the preformed piece c through a fourth station to form a rim finish forming and second forming of the toothed part to form a preformed piece d, simultaneously extrudes two ends of the preformed piece d through a fifth station to simultaneously extrude upsetting heads and simultaneously stretch two ends of the inner holes to form a preformed piece e, simultaneously extrudes two ends of the upsetting heads through a sixth station to reversely extrude a large bell mouth on one end surface when the two ends of the preformed piece e stretch the inner holes to finish forming of the rim dimension, instantly extrudes waste in the middle of the preformed piece f when the seventh station is punched into the inner hole to finish forming of the preformed piece f, and then the preformed piece f is transferred from different channels. Therefore, the cold forming die and the cold forming process of the hardware bushing of the automobile door system can simultaneously finish cold heading preforming and riveting final forming in the cold heading process, thereby improving the efficiency and reducing the cost.

Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The cold forming die for the hardware bushing of the automobile door system is characterized by comprising a first station, a second station, a third station, a fourth station, a fifth station, a sixth station and a seventh station which are used for forming forgings in sequence;

The first station comprises a first station male die and a first station female die, the first station male die comprises a first male die sleeve, a first pre-stamping die core is arranged inside one end of the first male die sleeve in a penetrating mode, a first cushion block is arranged at the other end of the first male die sleeve, the first station female die comprises a first stroke die, a first back stamping rod is arranged inside the first stroke die in a penetrating mode, the first stroke die is in clearance fit with the first back stamping rod and forms a first die opening, a first back sleeve head is sleeved at one end of the first back stamping rod, the first station male die is fixed on a cold header through the first male die sleeve, the first station female die is fixed on the cold header through the first stroke die, a preformed part h is sent to the first die opening, the first pre-stamping die core moves towards the first station female die, the first back stamping rod moves towards the first die opening to a preset position, and the preformed part h is extruded and deformed to form a preformed part a die;

The second station comprises a second station male die and a second station female die, the second station male die comprises a second male die sleeve, a second front punch rod is arranged in one end of the second male die sleeve in a penetrating manner, a second cushion block is arranged at the other end of the second male die sleeve, the second station female die comprises a second stroke die, a second rear punch rod is arranged in the second stroke die in a penetrating manner, the second stroke die is in clearance fit with the second rear punch rod and forms a second die opening, a second rear punch rod pipe, a second annular cushion block, a second three-hole seat cushion block, a second stroke die rear cushion and a second three-hole seat ejector pin are sleeved at one end of the second rear punch rod in sequence, the second station male die is fixed on a cold header through the second male die sleeve, the second station female die is fixed on the cold header through the second stroke die, a preformed part a is sent to the second die opening, the second front punch rod moves towards the second station female die, and the second rear punch rod moves towards a preset position b to form a preformed part;

The third station comprises a third station male die and a third station female die, the third station male die comprises a third male die sleeve, a third front punch rod is arranged in one end of the third male die sleeve in a penetrating manner, a third cushion block is arranged at the other end of the third male die sleeve, the third station female die comprises a third stroke die, a third rear punch rod is arranged in the third stroke die in a penetrating manner, the third stroke die and the third rear punch rod are in clearance fit and form a third die opening, a third rear punch rod pipe, a third annular cushion block, a third three-hole seat cushion block, a third stroke die rear cushion and a third three-hole seat ejector pin are sleeved at one end of the third rear punch rod in sequence, the third station male die is fixed on a cold header through the third male die sleeve, the third station female die is fixed on the cold header through the third stroke die, a preformed part b is sent to the third die opening, the third front punch rod moves towards the third station female die, and the third rear punch rod moves towards a preset position b to form a preformed part;

The fourth station male die comprises a fourth station male die and a fourth station female die, the fourth station male die comprises a fourth male die sleeve, a fourth front punch rod is arranged inside one end of the fourth male die sleeve in a penetrating manner, a fourth cushion block is arranged at the other end of the fourth male die sleeve, the fourth station female die comprises a fourth stroke die, a fourth rear punch rod is arranged inside the fourth stroke die in a penetrating manner, the fourth stroke die and the fourth rear punch rod are in clearance fit and form a fourth die orifice, a fourth rear punch rod tube, a fourth annular cushion block, a fourth three-hole seat cushion block, a fourth stroke die rear cushion and a fourth three-hole seat ejector pin are sequentially sleeved at one end of the fourth rear punch rod, the fourth male die is fixed on a cold header through the fourth male die sleeve, the fourth station female die is fixed on the cold header through the fourth stroke die, a preformed piece c is sent to the fourth orifice, the fourth front punch rod moves to the fourth station female die, and the fourth front punch rod moves to the fourth position in the fourth direction, and the preformed piece c moves to the fourth position to form a preset deformation forming position;

The fifth station comprises a fifth station male die and a fifth station female die, the fifth station male die comprises a fifth male die sleeve, a fifth front punch rod is arranged in one end of the fifth male die sleeve in a penetrating manner, a fifth cushion block is arranged at the other end of the fifth male die sleeve, the fifth station female die comprises a fifth stroke die, a fifth rear punch rod is arranged in the fifth stroke die in a penetrating manner, the fifth stroke die and the fifth rear punch rod are in clearance fit and form a fifth die opening, one end of the fifth rear punch rod is sequentially sleeved with a fifth rear punch rod pipe, a fifth annular cushion block, a fifth three-hole seat cushion block, a fifth stroke die rear cushion and a fifth three-hole seat ejector pin, the fifth station male die is fixed on a cold header through the fifth male die sleeve, the fifth station female die is fixed on the cold header through the fifth stroke die, a preformed part d is sent to the fifth die opening, the fifth front punch rod moves towards the fifth station, the fifth rear punch rod moves towards a preset position in the direction of the preformed part d, and forms a preformed part;

The sixth station comprises a sixth station male die and a sixth station female die, the sixth station male die comprises a sixth male die sleeve, a sixth front punch rod is arranged in one end of the sixth male die sleeve in a penetrating manner, a sixth cushion block is arranged at the other end of the sixth male die sleeve, the sixth station female die comprises a sixth stroke die, a sixth rear punch rod is arranged in the sixth stroke die in a penetrating manner, the sixth stroke die and the sixth rear punch rod are in clearance fit and form a sixth die opening, a sixth rear sleeve head is sleeved at one end of the sixth rear punch rod, the sixth station male die is fixed on a cold header through the sixth male die sleeve, the sixth station female die is fixed on the cold header through the sixth stroke die, a preformed part e is sent to the sixth die opening, the sixth front punch rod moves towards the sixth female die station, the sixth rear punch rod moves towards the sixth die opening to a preset position, and the preformed part e is extruded and deformed to form a preformed part f;

The seventh station comprises a seventh station male die and a seventh station female die, the seventh station male die comprises a seventh male die sleeve, a punching rod penetrates through one end of the seventh male die sleeve, a seventh cushion block is arranged at the other end of the seventh male die sleeve, the seventh station female die comprises a punching die core, the seventh station male die is fixed on a cold header through the seventh male die sleeve, a preformed piece f is sent to one end of the punching die core, the punching rod moves towards the punching die core to remove the connecting skin in the middle of the preformed piece f to form a through hole, and a finished product piece g is formed.

2. The cold-forming die of an automotive door system hardware bushing of claim 1, further comprising a conveyor that clamps castings sequentially through the first, second, third, fourth, fifth, sixth and seventh stations.

3. The cold-forming die for an automotive door system hardware bushing of claim 1, wherein said first station male mold is of a movable combined type construction;

the second station male membrane is of a movable combined structure;

the third station male membrane is of a movable combined structure;

The fourth station positive film is of a movable combined structure;

the fifth station male membrane is of a movable combined structure;

The sixth station male membrane is of a movable combined structure;

the seventh station male membrane is of a movable combined structure.

4. The cold forming die for a hardware bushing of an automobile door system of claim 1, wherein the first station female die is a prestress combined sleeve die structure;

the second station female die is of a prestress combined sleeve die structure.

5. The cold-forming die for an automotive door system hardware bushing of claim 1, wherein said preform h is a plastic part and said cold-forming die is a rigid body.

6. The cold-forming die for an automotive door system hardware bushing of claim 1, wherein the cold-forming die has a temperature of 20 degrees celsius and a friction factor of 0.08.

7. The cold forming die for an automotive door system hardware bushing of claim 1, wherein said first station is made of a cemented carbide material and a hot work die steel interference fit;

the second station is made of hard alloy materials and hot work die steel in an interference fit manner;

The third station is made of hard alloy materials and hot work die steel in interference fit;

the fourth station is made of hard alloy materials and hot work die steel in an interference fit manner;

the fifth station is made of hard alloy materials and hot work die steel in an interference fit manner;

The sixth station is made of hard alloy materials and hot work die steel in an interference fit mode;

the seventh station is made of hard alloy materials and hot working die steel in an interference fit mode.

8. The cold-forming die for automotive door system hardware bushings of claim 1, wherein the rims at both ends of the finished part g are sized Φ11 and Φ14, respectively.

9. The cold-forming die for automotive door system hardware bushings of claim 1, wherein said finished part g has a middle tooth size of Φ10.5.

10. A cold forming process of an automobile door system hardware bushing is characterized by comprising the following steps of:

S0, blanking, and cutting out a rivet nut as a preformed piece h;

S1, performing full-closed forward extrusion deformation on a preform h by utilizing a first station, and eliminating tearing to form a preform a;

S2, overturning the preformed piece a by utilizing a second station, and stretching the large hole of the press riveting end to form a thin wall by forward extrusion to form a preformed piece b;

S3, forward extruding the preformed piece b by utilizing a third station to finish upsetting forming of straight teeth, and finishing first forming of the rim and the tooth-shaped part to form a preformed piece c;

s4, extruding and upsetting the outer diameter of the head at the two ends of the preformed piece c by utilizing a fourth station to finish the final forming of the rim and the second forming of the tooth-shaped part to form a preformed piece d;

s5, extruding upsets at two ends of the preform d simultaneously and stretching inner holes at two ends simultaneously by utilizing a fifth station to form a preform e;

s6, extruding upsets at two ends of the preformed piece e simultaneously by utilizing a sixth station, and reversely extruding to forge a large bell mouth at one time when inner holes are stretched at the two ends, so that the final forming of the rim size is completed, and a preformed piece f is formed;

s7, instantly extruding waste in the middle of the preformed piece f when the seventh station is used for flushing the inner hole of the preformed piece f, and conveying the preformed piece f and the waste from different channels after the waste is completed to form a finished product piece g.