Cold heading machine

Abstract

A cold heading mechanism of the cold heading machine comprises a machine frame, a feeding groove and a forming die are arranged on the machine frame, a feeding hole and a pushing hole are formed in the feeding groove, a cut-off tool capable of conducting transverse reciprocating motion is arranged between the feeding hole and the pushing hole, and a pneumatic clamping hand capable of conducting transverse reciprocating motion is arranged between the pushing hole and the forming die. The pneumatic clamping hand is located on the side, away from the pushing hole, of the cut-off tool, a first pushing rod longitudinally reciprocating is arranged in the pushing hole, a fixed-length assembly is further arranged on the rack and located on the side, away from the feeding hole, of the cut-off tool, and a second pushing rod longitudinally reciprocating is arranged on the side, away from the pneumatic clamping hand, of the forming die. And a stamping mechanism is arranged on the other side. Blanks can be conveniently and rapidly transferred and fed, and meanwhile friction damage between the fixed-length assembly and the blanks is avoided as much as possible; the stamping mechanism comprises a pre-stamping head and a forming stamping head, two-time stamping forming is conducted on the same forming die, and the situation of cracks or stress concentration is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cold heading equipment, in particular to a cold heading machine. Background Art

[0002] When cold heading machines are used to prepare screws and rivets, the main steps are as follows: the wire is cut to a fixed length to obtain a blank, and then the blank is fed into the forming die and processed into the desired shape by a stamping mechanism. When using existing cold heading machines, the following problems are likely to occur: when the cutting tool pushes the blank to move, the blank is easily worn with the fixed-length component, resulting in a large fixed-length error over time; the blank cannot be quickly and effectively transferred between the cutting tool and the feeding mechanism (such as pneumatic grippers, etc.), affecting the processing efficiency; when cold heading is formed, if the blank is stamped once at the same forming die, the feeding mechanism needs to first send the blank to the forming die for positioning before stamping can be performed, and the product is prone to cracks or stress concentration after stamping once, affecting the quality of the product. Summary of the invention

[0003] The present invention proposes a cold heading machine, which is convenient for rapid transfer and feeding of blanks and avoids friction damage between fixed-length components and blanks as much as possible; at the same time, the stamping mechanism includes a pre-stamping head and a forming stamping head, and stamping and forming are performed twice at the same forming die to reduce cracks or stress concentration.

[0004] The technical solution of the present invention is achieved as follows: a cold heading machine comprises an unwinding mechanism, a straightening mechanism, a loading mechanism and a cold heading mechanism which are sequentially arranged along the wire conveying direction, the cold heading mechanism comprises a frame, a feeding trough and a forming mold are sequentially arranged on the frame in the horizontal direction, a longitudinal loading hole and a pushing hole are arranged in the feeding trough, a cutting tool which reciprocates laterally is arranged between the loading hole and the pushing hole, a pneumatic clamp which reciprocates laterally is arranged between the pushing hole and the forming mold, the pneumatic clamp is located on the side of the cutting tool away from the pushing hole, a first pushing rod which reciprocates longitudinally is arranged in the pushing hole, a fixed length assembly is also provided on the frame, the fixed length assembly is located on the side of the cutting tool away from the loading hole, a second pushing rod which reciprocates longitudinally is arranged on the side of the forming mold away from the pneumatic clamp, and a stamping mechanism is arranged on the other side of the forming mold.

[0005] Furthermore, the cutting tool comprises a tool rod, and a detachable end head is arranged at one end of the tool rod close to the forming die, and a circular cutter is clamped at the junction of the tool rod and the end head.

[0006] Furthermore, the circular cutter includes an annular cutter seat, a positioning ring is arranged on the outer side of the annular cutter seat, an annular tungsten steel cutter is arranged on the inner side of the annular cutter seat, and an inner hole of the tungsten steel cutter corresponds to the feeding hole.

[0007] Furthermore, the fixed-length component includes a connecting seat with an adjustable longitudinal position, a first travel switch is fixed on the connecting seat, a longitudinal swing arm of the first travel switch is opposite to the feeding hole, and a reset spring is arranged between the frame and the longitudinal swing arm.

[0008] Furthermore, the stamping mechanism includes a base that reciprocates longitudinally, a machine base that reciprocates vertically is arranged on the base, and a pre-punching head and a forming punching head are vertically arranged on one side of the machine base close to the forming mold. The pre-punching head punches the blank into the forming mold, and the forming punching head punches the exposed end of the blank into a mushroom head shape.

[0009] Furthermore, a transverse limit rod is provided on the longitudinal swing arm, and the limit rod extends to the pushing hole to limit the distance that the blank is pushed out.

[0010] Furthermore, the unwinding mechanism includes a bracket, a cantilever is arranged on the bracket, a roller is arranged on the upper end of the cantilever, and a detachable limit stop rod is arranged at one end of the cantilever away from the bracket.

[0011] Furthermore, the pneumatic gripper is vertically arranged on the feed rod, and a driving swing arm is also arranged on the frame. One end of the driving swing arm is connected to the swing cylinder, and the other end is provided with a strip hole. The strip hole is hinged to the feed rod, and horizontal telescopic guide rods are arranged between both sides of the feed rod and the frame.

[0012] Beneficial effects of the present invention:

[0013] The present invention realizes rapid transfer and feeding of the blank through the cooperation of the cutting tool, the pneumatic clamp, the pushing hole and the first pushing rod, so that the blank is transferred from the cutting tool to the pneumatic clamp, and then the pneumatic clamp feeds the blank to the forming mold; the fixed length component performs blank fixing by the longitudinal swing arm of the first stroke switch, and the longitudinal swing arm can swing to avoid friction damage with the blank as much as possible, without affecting the subsequent fixed length, and the first stroke switch can also send an induction signal when the blank is cut off and fed.

[0014] The punching mechanism of the present invention includes a pre-punching head and a forming punching head. The pre-punching head first punches the blank in the pneumatic gripper into the forming die to perform pre-forming on the one hand, and on the other hand, sends one end of the blank to the forming die for positioning, so that the subsequent pneumatic gripper can release the blank and return. Then the machine base is moved up, and the forming punching head is used to punch again to punch the exposed part of the blank into the required shape. With this structural setting, there is no need to add a pusher component. The blank at the pneumatic gripper is sent to the forming die, and the two punchings are performed at the same time, which can also reduce cracks or stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the cold heading machine of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the cutting tool;

[0018] Figure 3 It is a structural schematic diagram of the stamping mechanism;

[0019] Figure 4 It is a schematic diagram of the structure of a circular cutter;

[0020] Figure 5 for Figure 4 A top view of

[0021] Figure 6 It is a schematic diagram of the split structure of the tool bar and the end head;

[0022] Figure 7 It is a structural schematic diagram of a fixed-length component;

[0023] Figure 8 It is a schematic diagram of the structure of the driving swing arm;

[0024] Fig. 9 It is a structural schematic diagram of the unwinding mechanism.

[0025] Unwinding mechanism 1, straightening mechanism 2, feeding mechanism 3, cold heading mechanism 4, frame 5, feed trough 6, forming mold 7, punching mechanism 8, base 9, machine base 10, pre-punching head 11, forming punching head 12, second pushing rod 13, feeding hole 14, pushing hole 15, knife rod 16, end 17, circular cutter 18, annular knife seat 19, positioning ring 20, tungsten steel knife 21, longitudinal positioning groove 22, groove 23, pneumatic clamp 24, feeding rod 25, driving swing arm 26, swing cylinder 27, bearing seat 28, unloading rod 29, unloading swing arm 30, connecting seat 31, longitudinal screw 32, first stroke switch 33, longitudinal swing arm 34, reset spring 35, limit rod 36, first pushing rod 37, bracket 38, cantilever 39, roller 40, limit stop rod 41. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The horizontal and vertical position terms of the present invention are relative to Figure 2 The position relationship shown.

[0028] like Figure 1 , 2 As shown in Figure 3, a cold heading machine comprises an unwinding mechanism 1, a straightening mechanism 2, a feeding mechanism 3 and a cold heading mechanism 4 which are sequentially arranged along the wire conveying direction. The cold heading mechanism 4 comprises a frame 5. A feed trough 6 and a forming die 7 are sequentially arranged on the frame 5 in the horizontal direction. The forming die 7 is fixedly connected to the frame 5. A longitudinal forming hole is arranged in the forming die 7. A stamping mechanism 8 is arranged on one side of the forming die 7. The stamping mechanism 8 comprises a base 9. The base 9 is connected to a longitudinal linear drive module to drive the base 9 to perform longitudinal reciprocating motion. A vertically sliding machine base 10 is arranged at the upper end of the base 9. The machine base 10 is connected to a vertical linear drive module to drive the machine base 10 to perform vertical reciprocating motion. A pre-punching head 11 and a forming punching head 12 are vertically fixed on one side of the machine base 10 close to the forming die 7. The forming punching head 12 is located directly below the pre-punching head 11. The pre-punching head 11 punches the blank into the forming die 7, and the forming punching head 12 punches the exposed end of the blank into a mushroom head shape. A sliding second push rod 13 is provided on the other side of the forming die 7, and the second push rod 13 is connected to the longitudinal linear drive mechanism, so that the push rod reciprocates along the longitudinal direction of the forming hole to push the punched mushroom head element out of the forming hole. The linear drive module belongs to the existing structure, which can be a telescopic hydraulic cylinder, a telescopic cylinder or a connecting rod type linear drive, etc.

[0029] like Figure 2 and 4 -6, a longitudinal feeding hole 14 and a pushing hole 15 are arranged in the feeding trough 6, and a cutting tool for transverse reciprocating motion is arranged between the feeding hole 14 and the pushing hole 15, and the cutting tool includes a knife bar 16, and the end of the knife bar 16 close to the forming mold 7 is connected with an end 17 by bolts, and a circular cutter 18 is clamped at the junction of the knife bar 16 and the end 17. The circular cutter 18 includes an annular knife seat 19, and a positioning ring 20 is fixed to the outer side of the annular knife seat 19, and an annular tungsten steel knife 21 is fixed to the inner side of the annular knife seat 19, and the inner hole of the tungsten steel knife 21 corresponds to the feeding hole 14.

[0030] The connecting surfaces of the shank 16 and the end head 17 are both provided with longitudinal positioning grooves 22, which match the outer side wall of the annular knife seat 19. A coaxial groove 23 is provided in the longitudinal positioning groove 22, and the groove 23 cooperates with the positioning ring 20 to prevent the annular knife seat 19 from longitudinal displacement. When the circular cutter 18 needs to be replaced, the end head 17 is disassembled and the circular cutter 18 is removed. The side of the shank 16 away from the end head 17 is connected to the horizontal linear drive module.

[0031] like Figure 2 and 8 As shown, a pneumatic gripper 24 with transverse reciprocating motion is provided between the push hole 15 and the forming mold 7. The pneumatic gripper 24 is located on the side of the cutting tool away from the push hole 15. The pneumatic gripper 24 is vertically installed on the feed rod 25. The feed rod 25 slides transversely along the frame 5. A driving swing arm 26 is also provided on the frame 5. One end of the driving swing arm 26 is connected to the swing cylinder 27, and the other end is provided with a strip hole. The strip hole is hinged to the feed rod 25, and the feed rod 25 is driven to reciprocate transversely by the swing cylinder 27 and the driving swing arm 26. Transverse telescopic guide rods are connected between the two sides of the feed rod 25 and the frame 5 to ensure the transverse linear motion of the feed rod 25.

[0032] A second travel switch connected to the pneumatic gripper 24 is also installed on the feed rod 25. The second travel switch is a swing arm travel switch. A bearing seat 28 is fixed on the frame 5. A reciprocating discharge rod 29 is rotatably connected to the bearing seat 28. The discharge rod 29 cooperates with the discharge swing arm 30 of the second travel switch. The discharge rod 29 swings downward and abuts against the discharge swing arm 30, and the pneumatic gripper 24 opens. The end of the discharge rod 29 away from the discharge swing arm 30 is connected to a crank rocker mechanism. The crank rocker mechanism is an existing structure, driven by a reduction motor, and drives the discharge rod 29 to swing back and forth through the crank rocker mechanism.

[0033] like Figure 7As shown, the frame 5 is also provided with a fixed length component, which is located on the side of the cutting tool away from the feeding hole 14, and the fixed length component includes a connecting seat 31, which is connected to the frame 5 through a longitudinal screw 32, one end of the longitudinal screw 32 is fixedly connected to the frame 5, and the other end slides through the connecting seat 31, and locking nuts are screwed on the longitudinal screws 32 on both sides of the connecting seat 31. By loosening the nuts, the position of the connecting seat 31 is longitudinally adjusted. A first travel switch 33 is fixed on the connecting seat 31, and the first travel switch 33 is a swing arm travel switch. The longitudinal swing arm 34 of the first travel switch 33 is opposite to the feeding hole 14, and the frame 5 and the longitudinal swing arm 34 are connected by a reset spring 35. The wire passes longitudinally through the feeding hole 14 and the circular cutter 18 and abuts against the longitudinal swing arm 34. The cutting tool moves laterally to cut the wire to obtain a blank. The longitudinal swing arm 34 swings, and the first stroke switch 33 senses that the blank moves toward the pushing hole 15. After the blank leaves the longitudinal swing arm 34, the longitudinal swing arm 34 is reset under the action of the reset spring 35.

[0034] A transverse limit rod 36 is fixed on the longitudinal swing arm 34, and the limit rod 36 extends to the push hole 15. A sliding first push rod 37 is arranged in the push hole 15, and the first push rod 37 is connected to the longitudinal linear drive module. When the cutting tool drives the blank to move to the push hole 15, the pneumatic clamp 24 clamps the blank, and the push rod moves longitudinally out of the push hole 15 and pushes the blank away from the circular cutter 18. The limit rod 36 is used to limit the longitudinal push distance of the blank.

[0035] The straightening mechanism 2 is used for straightening the wires, and the feeding mechanism 3 is used for intermittent equal-length feeding of the wires, both of which belong to the existing structures. Fig. 9 As shown, the unwinding mechanism 1 includes a bracket 38, a cantilever 39 is fixed on the bracket 38, and a roller 40 is connected to the upper end of the cantilever 39 through a bearing. A longitudinal hole is provided at the end of the cantilever 39 away from the bracket 38, and a limit stop rod 41 is inserted in the longitudinal hole. The wire coil is sleeved on the outside of the cantilever 39 and the roller 40, and the limit stop rod 41 limits the wire coil to prevent it from falling off the cantilever 39.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold heading machine, comprising an unwinding mechanism, a straightening mechanism, a feeding mechanism and a cold heading mechanism arranged in sequence along the wire conveying direction, the cold heading mechanism comprising a frame, characterized in that: A feed trough and a forming mold are sequentially arranged along the horizontal direction on the frame, a longitudinal loading hole and a pushing hole are arranged in the feed trough, a cutting tool with transverse reciprocating motion is arranged between the loading hole and the pushing hole, a pneumatic clamp with transverse reciprocating motion is arranged between the pushing hole and the forming mold, the pneumatic clamp is located on the side of the cutting tool away from the pushing hole, a first pushing rod with longitudinal reciprocating motion is arranged in the pushing hole, a fixed-length component is also arranged on the frame, the fixed-length component is located on the side of the cutting tool away from the loading hole, a second pushing rod with longitudinal reciprocating motion is arranged on the side of the forming mold away from the pneumatic clamp, and a stamping mechanism is arranged on the other side of the forming mold.

2. A cold heading machine according to claim 1, characterized in that: The cutting tool comprises a tool rod, one end of the tool rod close to the forming die is provided with a detachable end head, and a circular cutting knife is clamped at the junction of the tool rod and the end head.

3. A cold heading machine according to claim 2, characterized in that: The circular cutter comprises an annular cutter seat, a positioning ring is arranged on the outer side of the annular cutter seat, an annular tungsten steel cutter is arranged on the inner side of the annular cutter seat, and the inner hole of the tungsten steel cutter corresponds to the feeding hole.

4. A cold heading machine according to claim 1, characterized in that: The fixed-length component comprises a connecting seat with adjustable longitudinal position, a first travel switch is fixed on the connecting seat, a longitudinal swing arm of the first travel switch is opposite to the feeding hole, and a reset spring is arranged between the frame and the longitudinal swing arm.

5. A cold heading machine according to claim 1, characterized in that: The stamping mechanism includes a base that reciprocates longitudinally, on which a machine base that reciprocates vertically is arranged. A pre-punching head and a forming punching head are vertically arranged on one side of the machine base close to the forming die. The pre-punching head punches the blank into the forming die, and the forming punching head punches the exposed end of the blank into a mushroom head shape.

6. A cold heading machine according to claim 4, characterized in that: A transverse limit rod is arranged on the longitudinal swing arm, and the limit rod extends to the pushing hole to limit the distance of the blank being pushed out.

7. A cold heading machine according to claim 1, characterized in that: The unwinding mechanism comprises a bracket, a cantilever is arranged on the bracket, a roller is arranged on the upper end of the cantilever, and a detachable limit stop rod is arranged at one end of the cantilever away from the bracket.

8. A cold heading machine according to claim 1, characterized in that: The pneumatic gripper is vertically arranged on the feed rod, and a driving swing arm is also arranged on the frame. One end of the driving swing arm is connected to the swing cylinder, and the other end is provided with a strip hole, which is hinged to the feed rod. Horizontal telescopic guide rods are arranged between both sides of the feed rod and the frame.

Images