CN211088710U - Multi-station cold press welding compound machine - Google Patents

Abstract

A multi-station cold press welding compound machine comprises a machine frame (1), a main sliding block (2), a die holder (3), a first wire inlet device (4), a second wire inlet device (5), a material returning mechanism (6), a first wire cutting knife bar (7), a first pre-upsetting needle assembly (8) and a cam device for controlling all relevant parts of the machine to work in a coordinated mode, wherein the main sliding block (2) and the die holder (3) are arranged at the left end and the right end of the machine frame (1) in an opposite mode; the die holder (3) is sequentially provided with the first wire inlet device (4), the second wire inlet device (5), the first forming die (9), the second forming die (10) and the third wire inlet device (11) from back to front. The utility model discloses a carry out twice composite forming respectively on first forming die (9) and second forming die (10) and make three compound electrical contact.

Description

Multi-station cold press welding compound machine

Technical Field

The utility model relates to the technical field of machining, especially, relate to a multistation cold press welding compounding machine.

Background

When producing a three-compound electrical contact: firstly, forming a semi-finished product by a first part of silver material and a copper material in a cold pressure welding mode; then, a second part of silver material is welded on the head of the semi-finished product by cold pressure welding again.

In the prior art, a single-station cold-press welding compound machine only carries out automatic cold-press welding compound molding on a first part of silver wire materials and copper wire materials, and cannot complete cold-press welding operation of three parts of materials at one time; in order to further improve the efficiency of automatic production, a multi-station cold-press welding compound machine for automatically compounding and forming three parts of materials is needed.

SUMMERY OF THE UTILITY MODEL

To the weak point in prior art, the utility model provides a multistation cold press welding compounding machine.

The utility model provides a following technical scheme:

a multi-station cold press welding compound machine comprises a machine frame (1), a main sliding block (2), a die holder (3), a first wire inlet device (4), a second wire inlet device (5), a material returning mechanism (6), a first wire cutting knife bar (7), a first pre-upsetting needle assembly (8) and a cam device for controlling all relevant parts of the machine to work in a coordinated mode, wherein the main sliding block (2) and the die holder (3) are oppositely arranged at the left end and the right end of the machine frame (1); the die holder (3) is sequentially provided with the first wire inlet device (4), the second wire inlet device (5), the first forming die (9), the second forming die (10) and a third wire inlet device (11) from back to front; the first forming die (9) comprises a floating plate (12), a guide post (13) and a first return spring (14); the floating plate (12) is movably arranged on the guide post (13) on the left wall surface of the die holder (3) in a penetrating way; the first return spring (14) is abutted between the floating plate (12) and the die holder (3); the buoyancy lifting plate (12) is provided with a first forming hole (15); the material returning mechanism (6) is matched with the first forming hole (15), and the cam device drives the material returning mechanism (6) to push out a product in the first forming hole (15); a second forming hole (16) is formed in the second forming die (10); a material transplanting mechanism (17) for clamping the product at the first forming hole (15) to the second forming hole (16) is arranged on the upper end face of the die holder (3); the material transplanting mechanism (17) comprises a sliding platform (18) and a clamp (19) arranged on the sliding platform (18); the cam device drives the sliding platform (18) which is arranged on the die holder (3) in a sliding mode to slide back and forth; the clamp (19) is driven by the cam device to be loosened or clamped; the rack (1) is provided with a second wire shearing cutter bar (20) which is used for shearing the wire supplied by the third wire feeding device (11) and sending the wire to the second forming hole (16); the cam device drives the second thread trimming cutter rod (20); a punch seat (21) is slidably mounted at the right end of the main sliding block (2); the cam device drives the punch holder (21) to slide up and down; a first pre-upsetting punch (22) matched with the first pre-upsetting needle assembly (8) is arranged on the punch seat (21); the punch head seat (21) is also provided with a first final upsetting punch head (23) which is positioned at the lower side of the first pre-upsetting punch head (22) and is matched with the first forming hole (15); a second pre-upsetting punch (24) is further arranged on the punch seat (21), and a second pre-upsetting needle assembly (25) which punches the material in the second trimming cutter bar (20) and the semi-finished product clamped by the clamp (19) to the second forming hole (16) simultaneously is arranged on the second pre-upsetting punch (24); and a second final heading punch (26) matched with the second forming hole (16) is further arranged on the punch seat (21).

Preferably, the first pre-upsetting needle assembly (8) comprises a needle seat (27), a shell (28), a screw cap (29), a first needle sleeve (30), a first pre-upsetting needle (31), a ball sleeve (32) and a second return spring (33); the shell (28) is arranged on the left end face of the needle seat (27); the free end of the shell (28) is in threaded connection with the nut (29); the first needle sleeve (30) is movably arranged through the nut (29); one end of the first needle sleeve (30) penetrating into the shell (28) is connected with the first pre-upsetting needle (31); the free end of the first pre-upsetting needle (31) movably penetrates through the needle seat (27) and is matched with the first thread shearing cutter bar (7); the ball sleeve (32) is filled between the inner wall surface of the free end of the shell (28) and the first needle sleeve (30); the second return spring (33) is abutted between the right end of the first needle sleeve (30) and the needle seat (27).

Preferably, the second pre-upsetting needle assembly (25) comprises a third return spring (34), a spring seat (35) and a second pre-upsetting needle (36); the third return spring (34), the spring seat (35) and the second pre-upsetting needle (36) are sequentially arranged in the second pre-upsetting punch (24) from left to right in a penetrating manner; two ends of the third return spring respectively abut against the punch seat (21) and the spring seat (35); the right end of the spring seat (35) abuts against the second pre-heading needle (36); the right end of the second pre-heading needle (36) penetrates out of the second pre-heading punch (24).

Preferably, the clamp (19) comprises two clamping arms (37), a pin shaft (38), a fourth return spring (39) and a first cam follower (40); the middle parts of the two clamping arms (37) are hinged through the pin shaft (38); the pin shaft (38) is fixedly connected with the sliding platform (18); the fourth return spring (39) is hooked between the clamp head ends of the two clamping arms (37), and the other ends of the fourth return spring are respectively provided with the first cam follower (40); a pressure plate (41) is abutted on the first cam follower (40), and the pressure plate (41) is connected with the front end of a first connecting rod (42); the middle part of the first connecting rod (42) is pivoted with a pivoting seat (43) at the upper end of the die holder (3); the rear end of the first connecting rod (42) is provided with a first bearing (45) matched with a first cam (44) of the cam device.

Compared with the prior art, the utility model discloses following beneficial effect has:

the first pre-upsetting punch, the first final-upsetting punch, the first pre-upsetting needle assembly and the first forming die are mutually matched, and the first part of silver material and the copper material are subjected to cold pressure welding to form a semi-finished product; then, the semi-finished product and the other part of silver material are subjected to cold pressure welding to form a three-composite electric contact through the mutual matching of a second pre-upsetting punch, a second final-upsetting punch, a second pre-upsetting needle assembly and a second forming die; has the advantages of simple structure and high production efficiency.

Drawings

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a perspective view of the overall structure of the present invention;

fig. 3 is a schematic structural view of the relevant parts on the side of the punch holder of the present invention;

FIG. 4 is a first drawing illustrating the structure of the related parts of the die holder side of the present invention;

FIG. 5 is a second drawing illustrating the structure of the related parts of the die holder side of the present invention;

FIG. 6 is a third drawing illustrating the structure of the related parts of the die holder side of the present invention;

fig. 7 is a cross-sectional view of a first pre-upset needle assembly of the present invention;

fig. 8 is a cross-sectional view of a second pre-upset needle assembly of the present invention;

fig. 9 is a schematic structural view of the material transplanting mechanism of the present invention;

the reference numbers in the figures are respectively: (1) a machine frame, (2) a main sliding block, (3) a die holder, (4) a first wire inlet device, (5) a second wire inlet device, (6) a first material returning mechanism, (7) a first wire shearing tool rod, (8) a first pre-upsetting needle assembly, (9) a first forming die, (10) a second forming die, (11) a third wire inlet device, (12) a floating plate, (13) a guide post, (14) a first return spring, (15) a first forming hole, (16) a second forming hole, (17) a material transplanting mechanism, (18) a sliding platform, (19) a clamp, (20) a second wire shearing tool rod, (21) a punch holder, (22) a first pre-upsetting punch, (23) a first final upsetting punch, (24) a second pre-upsetting punch, (25) a second pre-upsetting needle assembly, (26) a second final upsetting punch, (27) a needle holder, (28) a shell, (29) a nut, (30) a first needle sleeve, (31) a first pre-heading needle, (32) a ball sleeve, (33) a second return spring, (34) a third return spring, (35) a spring seat, (36) a second pre-heading needle, (37) a clamping arm, (38) a pin shaft, (39) a fourth return spring, (40) a cam follower, (41) a pressure plate, (42) a first connecting rod, (43) a pivoting seat, (44) a first cam, (45) a bearing, (46) a belt wheel, (47) a first wire inlet, (48) a second wire inlet, (49) a third wire inlet, (50) a wire shearing groove; (51) the device comprises a first longitudinal rotating shaft, (52) a driven gear, (53) a third cam, (54) a second connecting rod, (56) a second cam follower, (57) a second swinging block, (58) a second longitudinal rotating shaft, (59) a third swinging block, and (60) a third connecting rod.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

Examples

A multi-station cold press welding compound machine comprises a machine frame 1, a main sliding block 2, a die holder 3, a first wire inlet device 4, a second wire inlet device 5, a material returning mechanism 6, a first wire cutting knife rod 7, a first pre-upsetting needle assembly 8 and a cam device for controlling all relevant parts of the machine to work in a coordinated mode. The structure and the connection relation of the frame 1, the main sliding block 2, the die holder 3, the first wire inlet device 4, the second wire inlet device 5, the material returning mechanism 6, the first wire shearing cutter bar 7, the first pre-upsetting needle assembly 8 and the cam device for controlling the coordinated work of all related parts of the machine are the same as those of the existing single-station cold press welding compound machine for producing two compound electrical contacts; specifically, the method comprises the following steps: the cam device is arranged on the frame 1; the cam gear is matched with an external power source through a belt wheel 46; the left end and the right end of the rack 1 are oppositely provided with the main sliding block 1 and the die holder 2; the cam device drives the main sliding block 1 to slide left and right; the die holder 2 is sequentially provided with a first wire inlet device 4 for supplying copper wire materials and a second wire inlet device 5 for supplying a first part of silver wire materials from back to front; the rack 1 is also provided with the first trimming cutter bar 7; the first wire shearing cutter bar 7 is provided with a wire shearing through hole; the cam device drives the first thread trimming cutter rod 7 to do linear reciprocating motion in the front-back direction. The first wire inlet device 4 and the second wire inlet device 5 respectively send wires into the wire shearing through hole, and the first wire shearing cutter bar 7 forcibly shears the wires sent into the wire shearing through hole from the corresponding wire inlet devices in the moving process; meanwhile, the first wire shearing cutter rod 7 is also provided with a first pre-upsetting needle assembly 8 for stamping the wire in the wire shearing through hole.

The die holder 3 is provided with the first wire inlet device 4, the second wire inlet device 5, the first forming die 9, the second forming die 10 and a third wire inlet device 11 in sequence from back to front; specifically, the method comprises the following steps: a first wire inlet hole 47, a second wire inlet hole 48 and a third wire inlet hole 49 are formed in the right wall surface of the die holder; a copper wire supplied by the first wire inlet device 4 penetrates out of the first wire inlet hole 47 and then enters the wire shearing hole of the first shearing cutter bar 7; the silver wire material supplied by the second wire feeding device 5 penetrates out of the second wire feeding hole and then enters the wire cutting hole of the first cutting knife rod 7.

The first forming die 9 comprises a floating plate 12, a guide post 13 and a first return spring 14; the floating plate 12 is movably arranged on the guide post 13 on the left wall surface of the die holder 3 in a penetrating way; the first return spring 14 is abutted between the floating plate 12 and the die holder 3; the buoyancy lifting plate 12 is provided with a first forming hole 15; the material returning mechanism 6 is matched with the first forming hole 15, and the cam device drives the material returning mechanism 6 to push out the product in the first forming hole 15; the material returning mechanism 6 is the same as the existing single-station cold-press welding compound machine, and comprises a push rod (not shown in the figure) matched with the first forming hole 15, and the cam device drives the push rod to push out the workpiece in the first forming hole 15.

The second forming die 10 is provided with a second forming hole 16.

A material transplanting mechanism 17 for clamping the product at the first forming hole 15 to the second forming hole 16 is arranged on the upper end face of the die holder 3; the material transplanting mechanism 17 comprises a sliding platform 18 and a clamp 19 arranged on the sliding platform 18; the cam device drives the sliding platform 18 which is arranged on the die holder 3 in a sliding mode to slide back and forth; the clamp 19 is driven by the cam device to release or clamp.

A second wire cutting cutter bar 20 for cutting the wire supplied by the third wire feeding device 11 and feeding the cut wire to the second forming hole 16 is arranged on the frame 1; the cam device drives the second thread trimmer bar 20. Specifically, the cam device drives the second trimming cutter bar 20 to move back and forth, a wire cutting groove 50 is formed in the second trimming cutter bar 20, and when the second trimming cutter bar 20 moves to the third wire inlet hole 49 in the rear direction, a silver wire supplied by the third wire inlet device 11 passes through the third wire inlet hole 47 and is inserted into the wire cutting groove 50; then, the second thread trimmer bar 20 continues to move in the rear direction, cuts the silver thread inserted therein, and feeds the silver thread to the second forming hole 16. It should be noted that the third incoming line device 11 may adopt an incoming line device in the prior art; the transmission mechanism for driving the second wire cutting cutter rod 20 to move back and forth by the cam device can also adopt the transmission mechanism for driving the wire cutting cutter rod by the existing single-station cold-press welding compound machine.

The right end of the main sliding block 2 is provided with a punch holder 21 in a sliding manner; the cam device drives the punch holder 21 to slide up and down. A first pre-upsetting punch 22 matched with the first pre-upsetting needle assembly 8 is arranged on the punch seat 21; the punch head seat 21 is also provided with a first final upsetting punch 23 which is positioned at the lower side of the first pre-upsetting punch 22 and matched with the first forming hole 15; the punch holder 21 is further provided with a second pre-upsetting punch 24, and the second pre-upsetting punch 24 is provided with a second pre-upsetting needle assembly 25 which punches the material in the second trimming cutter bar 20 and the semi-finished product clamped by the clamp 19 to the second forming hole 16 simultaneously; the punch holder 21 is further provided with a second final heading punch 26 to be matched with the second forming hole 16.

Further, the first pre-upset needle assembly 8 comprises a needle seat 27, a housing 28, a nut 29, a first needle sleeve 30, a first pre-upset needle 31, a ball sleeve 32 and a second return spring 33; the shell 28 is arranged on the left end face of the needle seat 27; the free end of the shell 28 is screwed with the nut 29; the first needle sleeve 30 is movably arranged through the screw cap 29; one end of the first needle sleeve 30 penetrating into the shell 28 is connected with the first pre-heading needle 31; the free end of the first pre-upsetting needle 31 movably penetrates through the needle seat 27 and is matched with the first thread trimming cutter bar 7; the ball sleeve 32 is filled between the inner wall surface of the free end of the shell 28 and the first needle sleeve 30; the second return spring 33 is abutted between the right end of the first needle sleeve 30 and the needle seat 27. It should be noted that the left end of the ball sleeve 32 abuts against the inner wall surface of the nut 329, and the right end thereof may abut against the second return spring 33 together with the first needle sleeve 30 or directly abut against the right wall surface of the needle seat 27. When in work: first, the right row of the first needle jacket 30 is pushed by the first pre-heading punch 22; then, the first needle hub 30 drives the first pre-heading needle 31 to the right row; next, the first pre-heading pin 31 punches a first part of the silver material and the copper material in the first trimming bar 7 into the first forming hole 15, and performs pre-heading deformation. It should be noted that in the prior art, the first needle sleeve 30 and the housing 28 are in clearance fit, which easily causes the central axis of the first needle sleeve 30 and the central axis of the housing 28 to be not concentric, and further causes the first pre-upsetting needle 31 and the housing to be not concentric, and finally causes the first pre-upsetting needle 31 to collide and break when the first pre-upsetting punch 22 pushes the first needle sleeve 30; compared with the prior art, the utility model discloses load between first needle cover 30 and the casing 28 ball cover 32 realizes first needle cover 30 casing 28 with ball cover 32 closely cooperates between two liang, and then reaches the coincidence of three's center pin, and then has guaranteed first pre-upsetting needle 31 and relevant cooperation part's concentricity has been avoided first pre-upsetting needle subassembly 8 during operation damages.

Further, the second pre-heading needle assembly 25 comprises a third return spring 34, a spring seat 35 and a second pre-heading needle 36; the third return spring 34, the spring seat 35 and the second pre-upsetting pin 36 are sequentially arranged in the second pre-upsetting punch 24 from left to right in a penetrating manner; two ends of the third return spring respectively abut against the punch holder 21 and the spring holder 35; the right end of the spring seat 35 abuts against the second pre-heading needle 36; the right end of the second pre-heading pin 36 passes out of the second pre-heading punch 24. When the wire cutting device works, the second pre-upsetting needle 36, the wire cutting groove 50 of the second wire cutting cutter bar 20, the semi-finished product of the workpiece clamped by the clamp 19 and the second forming hole 16 are on the same transverse axis from left to right in sequence; then, the main slider 2 drives the punch holder 21 to move right, the punch holder 21 drives the second pre-heading pin 36 to move right, and the second pre-heading pin 36 punches the second portion of the silver material in the wire cutting groove 50 and the semi-finished product held by the clamp 19 into the second forming hole 16 and performs a second pre-heading deformation operation.

Further, the clamp 19 comprises two clamping arms 37, a pin 38, a fourth return spring 39 and a first cam follower 40; the middle parts of the two clamping arms 37 are hinged through the pin shaft 38; the pin 38 is fixedly connected with the sliding platform 18; the fourth return spring 39 is hooked between the gripper ends of the two gripper arms 37, and the other ends of the fourth return spring are respectively provided with the first cam follower 40; a pressure plate 41 is abutted on the first cam follower 40, and the pressure plate 41 is connected with the front end of a first connecting rod 42; the middle part of the first connecting rod 42 is pivoted to a pivoting seat 43 at the upper end of the die holder 3. When in work: firstly, the cam device drives the rear end of the first connecting rod 42 to move upwards, and the front end of the corresponding first connecting rod 42 moves downwards; then, the front end of the first link 42 drives the pressing plate 41 to move downward, and the pressing plate 41 drives the two cam followers 40 to move downward; finally, the cam follower 40 moves downward to press the upper ends of the two holding arms 37 apart, and accordingly, the two jaw portions of the gripper 19 open. Conversely, when the rear end of the first link 42 moves downward, the two jaw portions of the clamp 19 are clamped and reset by the pulling of the fourth return spring 39.

Further, the cam device is connected with a first transmission mechanism for driving the punch holder to slide up and down; the first transmission mechanism comprises a first longitudinal rotating shaft 51, a driven gear 52, a third cam 53, a second connecting rod 54, a second cam follower 56, a second swing block 57, a second longitudinal rotating shaft 58, a third swing block 59 and a third connecting rod 60; the left end of the frame 1 is rotatably connected with the first longitudinal rotating shaft 51, and the driven gear 52 and the third cam 53 are sleeved on the first longitudinal rotating shaft 51; the first gear 52 is driven by the cam device; the left end of the second connecting rod 54 is provided with a strip-shaped hole matched with the first longitudinal rotating shaft 51; the left side and the right side of the strip-shaped hole of the second connecting rod 54 are respectively provided with a second cam follower 56 matched with the third cam 53; the right end of the second connecting rod 54 is hinged with the second swing block 57; the second swing block 57 is fixedly connected with the second longitudinal rotating shaft 58 which is rotatably connected to the rack 1; so that the second connecting rod 54 and the second swing block 57 cooperate to form a first set of two-bar linkage mechanism, when the cam device drives the first longitudinal rotating shaft 51 to rotate, the first longitudinal rotating shaft 51 drives the second longitudinal rotating shaft 58 to alternately rotate forwards and backwards through the first set of two-bar linkage mechanism. The second longitudinal rotating shaft 58 is further connected with the third swinging block 59 positioned below the punch holder 21; the free end of the third swinging block 59 is hinged with the third connecting rod (60); the other end of the third link 60 is hinged to the lower part of the punch holder 21, so that the third pendulum block 59 and the third link 60 form a second set of two-link mechanisms; when the second longitudinal rotating shaft 58 rotates forward, the punch holder 21 is driven to move upward, otherwise, the punch holder 21 is driven to move downward.

The utility model discloses an at work, cam device's band pulley and external power source cooperation provide power, and the theory of operation of each part as follows:

firstly, shearing off the first part of silver material and copper material. In the process of advancing the first wire cutting knife bar 20, the wires supplied by the first wire feeding device 4 and the second wire feeding device 5 are cut short in sequence and stored in the wire cutting through holes.

In the second step, the first part of the silver material and the copper material are punched into the first forming hole 15 to perform the first pre-heading operation. The first wire cutting tool bar 20 continues to advance until the wire cutting through hole is matched with the first forming hole 15; the main sliding block 2 moves right until the first pre-upsetting punch 22 drives the first pre-upsetting needle assembly 8 to push the silver and copper materials in the wire rod shearing through hole into the first forming hole 15, and a first pre-upsetting deformation operation is carried out; then, the main sliding block 2 and the first trimming cutter bar 7 reset; at this time, the floating plate 12 is not displaced.

And thirdly, performing primary final upsetting deformation operation on the first part of the silver material and the copper material in the first forming hole 15. First, the cam device drives the punch platform 21 to move upward until the first final heading punch 23 is engaged with the first forming hole 15; then, the main slide block 2 moves to the right and drives the first final upsetting punch 23 to push the floating plate 12 to move to the right, and the material in the first forming hole 15 is subjected to final upsetting deformation to obtain a two-composite semi-finished product; finally; the punch holder 21 and the main slider 2 are reset.

And fourthly, punching a second part of silver material and the semi-finished product into the second forming hole 16 to carry out second pre-upsetting deformation operation. Firstly, the material returning mechanism 6 pushes out the semi-finished product in the first forming hole 15, and the clamp 19 clamps the semi-finished product to the second forming hole 16, and at the same time, the second trimming knife bar 20 shears a second part of silver material from the third wire feeding device 11 and sends the second part of silver material to the second forming hole 16; then, the main slider 2 drives the punch holder 21 to move to the right, the second pre-heading punch 24 and the second pre-heading pin 36 are driven to move to the right synchronously, the second pre-heading pin 36 punches a second part of the silver wire material on the second wire cutting tool bar 20 and the semi-finished product on the clamp 19 to the second forming hole 16, and a second pre-heading deformation operation is performed; finally, the main sliding block 2, the second thread trimming cutter bar 20 and the clamp 19 are reset.

And fifthly, performing secondary final upsetting deformation operation on the material in the second forming hole 16. First, the punch platform 21 ascends until the second final heading punch 26 is engaged with the second forming hole 16; then, the main slider 2 drives the punch seat 21 and the second final upsetting punch 26 to move right synchronously, and the material in the second forming hole 16 is subjected to secondary final upsetting operation, so that the required three-composite electrical contact is manufactured.

To sum up, the utility model discloses an foretell structural design solves the weak point that exists among the prior art, has characteristics such as structural design is reasonable, excellent in use effect.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. A multi-station cold press welding compound machine comprises a machine frame (1), a main sliding block (2), a die holder (3), a first wire inlet device (4), a second wire inlet device (5), a material returning mechanism (6), a first wire cutting knife bar (7), a first pre-upsetting needle assembly (8) and a cam device for controlling all relevant parts of the machine to work in a coordinated mode, wherein the main sliding block (2) and the die holder (3) are oppositely arranged at the left end and the right end of the machine frame (1); the method is characterized in that:

the die holder (3) is sequentially provided with the first wire inlet device (4), the second wire inlet device (5), the first forming die (9), the second forming die (10) and a third wire inlet device (11) from back to front;

the first forming die (9) comprises a floating plate (12), a guide post (13) and a first return spring (14); the floating plate (12) is movably arranged on the guide post (13) on the left wall surface of the die holder (3) in a penetrating way; the first return spring (14) is abutted between the floating plate (12) and the die holder (3); the buoyancy lifting plate (12) is provided with a first forming hole (15); the material returning mechanism (6) is matched with the first forming hole (15), and the cam device drives the material returning mechanism (6) to push out a product in the first forming hole (15);

a second forming hole (16) is formed in the second forming die (10);

a material transplanting mechanism (17) for clamping the product at the first forming hole (15) to the second forming hole (16) is arranged on the upper end face of the die holder (3); the material transplanting mechanism (17) comprises a sliding platform (18) and a clamp (19) arranged on the sliding platform (18); the cam device drives the sliding platform (18) which is arranged on the die holder (3) in a sliding mode to slide back and forth; the clamp (19) is driven by the cam device to be loosened or clamped;

the rack (1) is provided with a second wire shearing cutter bar (20) which is used for shearing the wire supplied by the third wire feeding device (11) and sending the wire to the second forming hole (16); the cam device drives the second thread trimming cutter rod (20);

a punch seat (21) is slidably mounted at the right end of the main sliding block (2); the cam device drives the punch holder (21) to slide up and down; a first pre-upsetting punch (22) matched with the first pre-upsetting needle assembly (8) is arranged on the punch seat (21); the punch head seat (21) is also provided with a first final upsetting punch head (23) which is positioned at the lower side of the first pre-upsetting punch head (22) and is matched with the first forming hole (15); a second pre-upsetting punch (24) is further arranged on the punch seat (21), and a second pre-upsetting needle assembly (25) which punches the material in the second trimming cutter bar (20) and the semi-finished product clamped by the clamp (19) to the second forming hole (16) simultaneously is arranged on the second pre-upsetting punch (24); and a second final heading punch (26) matched with the second forming hole (16) is further arranged on the punch seat (21).

2. The multi-station cold press welding compound machine according to claim 1, wherein: the first pre-upsetting needle assembly (8) comprises a needle seat (27), a shell (28), a screw cap (29), a first needle sleeve (30), a first pre-upsetting needle (31), a ball sleeve (32) and a second return spring (33); the shell (28) is arranged on the left end face of the needle seat (27); the free end of the shell (28) is in threaded connection with the nut (29); the first needle sleeve (30) is movably arranged through the nut (29); one end of the first needle sleeve (30) penetrating into the shell (28) is connected with the first pre-upsetting needle (31); the free end of the first pre-upsetting needle (31) movably penetrates through the needle seat (27) and is matched with the first thread shearing cutter bar (7); the ball sleeve (32) is filled between the inner wall surface of the free end of the shell (28) and the first needle sleeve (30); the second return spring (33) is abutted between the right end of the first needle sleeve (30) and the needle seat (27).

3. The multi-station cold press welding compound machine according to claim 1, wherein: the second pre-upsetting needle assembly (25) comprises a third return spring (34), a spring seat (35) and a second pre-upsetting needle (36); the third return spring (34), the spring seat (35) and the second pre-upsetting needle (36) are sequentially arranged in the second pre-upsetting punch (24) from left to right in a penetrating manner; two ends of the third return spring respectively abut against the punch seat (21) and the spring seat (35); the right end of the spring seat (35) abuts against the second pre-heading needle (36); the right end of the second pre-heading needle (36) penetrates out of the second pre-heading punch (24).

4. The multi-station cold press welding compound machine according to claim 1, wherein: the clamp (19) comprises two clamping arms (37), a pin shaft (38), a fourth return spring (39) and a first cam follower (40); the middle parts of the two clamping arms (37) are hinged through the pin shaft (38); the pin shaft (38) is fixedly connected with the sliding platform (18); the fourth return spring (39) is hooked between the clamp head ends of the two clamping arms (37), and the other ends of the fourth return spring are respectively provided with the first cam follower (40); a pressure plate (41) is abutted on the first cam follower (40), and the pressure plate (41) is connected with the front end of a first connecting rod (42); the middle part of the first connecting rod (42) is pivoted with a pivoting seat (43) at the upper end of the die holder (3); the rear end of the first connecting rod (42) is provided with a first bearing (45) matched with a first cam (44) of the cam device.

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