CN213496268U

CN213496268U - Cold header die and cold header

Info

Publication number: CN213496268U
Application number: CN202020702601.8U
Authority: CN
Inventors: 徐庆发
Original assignee: Langfang Qingfa Industry And Trade Co ltd
Current assignee: Langfang Qingfa Industry And Trade Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-06-22
Anticipated expiration: 2030-04-30

Abstract

The application discloses cold heading machine mould includes: the movable die comprises a first movable die and a second movable die; the first movable die and the fixed die are matched for one-time forming, and the second movable die and the fixed die are matched for secondary forming; the utility model provides a cold heading machine, includes a cold heading machine mould, still includes: the device comprises a machine body, a driving mechanism arranged on the machine body, a transmission mechanism connected with the driving mechanism and a feeding mechanism; the central lines of the fixed die and the movable die are positioned in the same vertical plane, and a gap is reserved between the fixed die and the movable die; the driving mechanism is used for driving the transmission mechanism, and the transmission mechanism drives the feeding mechanism and the cold header die to perform cold heading action.

Description

Cold header die and cold header

Technical Field

The disclosure generally relates to the technical field of cold headers, and particularly relates to a cold header die and a cold header.

Background

Mechanical jacks are one of common tools in the hoisting industry, jack screws are core components for bearing and torque transmission, and the traditional production processes are basically two types: 1. and (3) hot heading process, namely hot heading forming after heating by using an induction heating coil. 2. Firstly, cold heading blank, then heating and forming. However, the prior art has the following disadvantages: the appearance and shape of the product are inconsistent due to the fact that the thermal deformation amount of the heating forming is not well controlled, so that the subsequent processing is difficult, the manufacturing cost is increased, and the quality is difficult to control; the internal stress of metal after cold heading processing is increased sharply and is difficult to release, and the subsequent processing is difficult to avoid cracking, so that the cost is increased, and the rejection rate is increased due to cracking.

The cold header is a forging forming device for thickening the top of a bar or a wire at room temperature, and is a special device which mainly uses piers and is specially used for producing fasteners such as nuts and bolts in batches. The cold header can reduce cutting work as far as possible, is directly formed into a required shape and size, can save a large amount of materials, can greatly improve the production efficiency and obviously improve the mechanical strength of the upset part. Therefore, the cold header can also be used for the production of lead screws.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a cold header die and a cold header.

A cold header die, comprising: the movable die comprises a first movable die and a second movable die; the first movable die and the fixed die are matched for one-time forming, and the second movable die and the fixed die are matched for secondary forming;

the first movable mold includes: the device comprises a hollow die fixing sleeve, a first die and a first extrusion assembly, wherein the first die and the first extrusion assembly are coaxially arranged in the die fixing sleeve; a first cavity for forming a workpiece is formed in the first die, and the first extrusion assembly is used for controlling the workpiece to move;

the second movable mold includes: the second die and a second extrusion assembly are arranged in the second die; a second cavity for forming a workpiece is arranged in the second die, and the second extrusion assembly is used for controlling the workpiece to move;

and a third cavity for accommodating and forming the workpiece is arranged in the fixed die.

According to the technical scheme provided by the embodiment of the application, the first extrusion assembly comprises: the first retractable cushion block and the first ejector pin are arranged in the die fixing sleeve; one end of the first die extends out of the die fixing sleeve, a through hole is formed in the die fixing sleeve, the first cushion block is arranged at one end, far away from the first die, of the first die, one end of the first ejector pin is arranged in the first die, and the other end of the first ejector pin extends out of the first die and faces the first cushion block.

According to the technical scheme provided by the embodiment of the application, the second extrusion assembly comprises: the telescopic second cushion block and the second ejector pin are arranged in the second die; and a through hole for accommodating a second cushion block and a second thimble is formed in the second die, and the second cushion block can stretch in the second die.

According to the technical solution provided by the embodiment of the present application, the stent includes: the fixed die comprises a fixed die cavity, a fixed die middle sleeve and a fixed die outer sleeve, wherein a third die cavity is arranged in the fixed die cavity, the fixed die middle sleeve is sleeved outside the fixed die cavity, the fixed die outer sleeve is sleeved outside the fixed die middle sleeve, and a through hole communicated with the third die cavity is axially formed in one end of the fixed die middle sleeve.

According to the technical scheme provided by the embodiment of the application, the cold header die further comprises an ejection device, and the ejection device is used for ejecting the workpiece; the ejection device includes: the ejection outer sleeve body, the sliding seat, the safety pipe and the ejector rod are internally provided with grooves; one end of the safety pipe is connected with the fixed die, the ejection outer sleeve body is sleeved at one end of the safety pipe, the sliding seat is sleeved on the safety pipe and is positioned between the fixed die and the ejection outer sleeve body, the ejector rod is arranged in the safety pipe, and one end of the ejector rod is connected with the sliding seat; the third cavity in the fixed die can accommodate the ejector rod; the ejection outer sleeve body drives the sliding seat, so that the ejector rod is driven to reciprocate.

The utility model provides a cold heading machine, includes a cold heading machine mould, still includes: the device comprises a machine body, a driving mechanism arranged on the machine body, a transmission mechanism connected with the driving mechanism and a feeding mechanism; the central lines of the fixed die and the movable die are positioned in the same vertical plane, and a gap is reserved between the fixed die and the movable die; the driving mechanism is used for driving the transmission mechanism, and the transmission mechanism drives the feeding mechanism and the cold header die to perform cold heading action;

the transmission mechanism comprises a transposition mechanism; the transposition mechanism is used for driving the first movable die and the second movable die to do reciprocating motion, and comprises: the device comprises a first cam connected with a driving mechanism, a first slide block connected with the driving mechanism, a reversing connecting rod connected with the first cam, a second cam connected with the reversing connecting rod and a second slide block matched with the second cam; the second sliding block is arranged on the first sliding block in a sliding manner;

the fixed die is fixedly arranged on the machine body, and the movable die is arranged on the second sliding block; the driving mechanism drives the first sliding block to reciprocate along the axial direction of the fixed die; the first cam rotates to drive the reversing connecting rod, so that the second cam is driven to rotate to enable the second sliding block to reciprocate along the radial direction of the fixed die.

According to the technical scheme provided by the embodiment of the application, the transmission mechanism further comprises: the transmission cam, the feeding connecting rod, the ejection connecting rod and the shearing connecting rod are used for transmission;

the feeding mechanism comprises: the device comprises a straightener arranged on a machine body, a feeding pinch roller arranged on one side of the straightener, a ratchet assembly and a shearing assembly, wherein the ratchet assembly and the shearing assembly are connected with the feeding pinch roller;

the driving mechanism drives a transmission cam, the transmission cam drives a feeding connecting rod to enable a ratchet wheel assembly to move, and the ratchet wheel assembly drives a feeding pressing wheel to rotate, so that a workpiece enters a shearing assembly;

the driving mechanism drives the transmission cam, the transmission cam drives the ejection connecting rod, and the ejection connecting rod is connected with the ejection device, so that the ejection device reciprocates.

According to the technical scheme provided by the embodiment of the application, the driving mechanism comprises: the device comprises a motor, a first transmission gear and a crankshaft; the motor is arranged on the machine body and drives a first transmission gear, and the first transmission gear drives the crankshaft to move.

According to the technical scheme provided by the embodiment of the application, the shearing assembly comprises a shearing fixed die arranged on a machine body, a wedge block connected with a shearing connecting rod, a roller arranged in the wedge block, a shearing knife arranged on the wedge block and a return spring; a shearing knife gland is also arranged on the shearing knife; the driving mechanism drives the shearing connecting rod, the shearing connecting rod drives the wedge block to enable the roller to move, the roller drives the shearing knife to cut and feed, the reset spring is used for enabling the shearing knife to retreat, and the shearing knife does reciprocating motion along the radial direction of the fixed die

According to the technical scheme provided by the embodiment of the application, the ratchet assembly comprises: the ratchet wheel, the pawl, the transmission shaft and the second transmission gear; the feeding connecting rod is connected with the ratchet wheel and the pawl, the ratchet wheel drives the second transmission gear through the transmission shaft, and the second transmission gear drives the feeding pressing wheel to rotate.

In summary, according to the technical scheme of the application, the fixed die and the movable die which are used in a matched mode are arranged, so that the workpiece can be directly subjected to cold heading forming, and the production efficiency can be improved due to the matching of all parts on the cold heading machine; the device can enhance the strength of the workpiece, improve the product quality, reduce the manufacturing cost of the product, well improve the appearance of the workpiece and prolong the service life.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural view of a movable mold according to the present application;

FIG. 2 is a schematic structural view of a stent of the present application;

fig. 3 is a schematic structural diagram of the ejection device of the present application;

FIG. 4 is a schematic structural view (side view) of the cold header of the present application;

FIG. 5 is a schematic perspective view of a cold header of the present application;

FIG. 6 is a schematic structural view of the indexing mechanism of the present application;

FIG. 7 is a schematic view of the shear assembly of the present application.

Reference numbers in the figures: 10. a fixed mold; 11. fixing the die cavity; 12. a fixed die middle sleeve; 13. a fixed mould outer sleeve; 20. a first movable mold; 21. fixing a mold sleeve; 22. a first mold; 23. a first cushion block; 24. a first thimble; 30. a second movable mold; 31. a second mold; 32. a second cushion block; 33. a second thimble; 40. an ejection device; 41. ejecting the outer sleeve; 42. a sliding seat; 43. a safety tube; 44. a top rod; 500. a body; 600. a drive mechanism; 610. a first drive gear; 710. a transposition mechanism; 711. a first cam; 712. a reversing connecting rod; 713. a second cam; 714. a first slider; 715. a second slider; 720. a drive cam; 730. a feeding connecting rod; 740. ejecting the connecting rod; 750. a shear link; 810. straightening devices; 820. feeding pinch rollers; 830. a ratchet assembly; 831. a ratchet wheel; 832. a pawl; 833. a drive shaft; 834. a second transmission gear; 840. a shear assembly; 841. shearing the fixed die; 842. a wedge block; 843. a roller; 844. a shearing knife; 845. a return spring; 846. a shearing knife gland; 900. raw materials.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

A cold header die, comprising: a movable mold including a first movable mold 20 and a second movable mold 30, and a fixed mold 10; the first movable die 20 and the fixed die 10 are matched for one-time forming, and the second movable die 30 and the fixed die 10 are matched for secondary forming;

the first movable mold 20 includes: the device comprises a hollow die fixing sleeve 21, a first die 22 and a first extrusion assembly, wherein the first die 22 and the first extrusion assembly are coaxially arranged inside the die fixing sleeve 21; a first cavity for forming a workpiece is arranged in the first die 22, and the first extrusion assembly is used for controlling the workpiece to move;

the second movable mold 30 includes: a second die 31 and a second extrusion assembly disposed within the second die 31; a second cavity for forming a workpiece is arranged in the second die 31, and the second extrusion assembly is used for controlling the workpiece to move;

a third cavity for accommodating and forming the workpiece is formed in the fixed die 10.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the first compression assembly includes: a first telescopic cushion block 23 and a first thimble 24 which are arranged inside the die fixing sleeve 21; one end of the first mold 22 extends out of the mold fixing sleeve 21 and is provided with a through hole inside, the first cushion block 23 is arranged at one end relatively far away from the first mold 22, one end of the first thimble 24 is arranged in the first mold 22, and the other end extends out of the first mold 22 and faces the first cushion block 23.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the second compression assembly includes: a second retractable pad 32 and a second ejector pin 33 provided inside the second mold 31; a through hole for accommodating a second pad block 32 and a second thimble 33 is formed in the second mold 31, and the second pad block 32 can extend and contract in the second mold 31.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the stent 10 includes: the fixed die comprises a fixed die cavity 11, a fixed die middle sleeve 12 and a fixed die outer sleeve 13, wherein the fixed die cavity 11 is internally provided with a third die cavity, the fixed die middle sleeve 12 is sleeved outside the fixed die cavity 11, the fixed die outer sleeve 13 is sleeved outside the fixed die middle sleeve 12, and one end of the fixed die middle sleeve 12 is axially provided with a through hole communicated with the third die cavity.

When the device is used, the first movable die 20 is matched with the fixed die 10 to form a workpiece in one step, the second movable die 30 is matched with the fixed die 10 to form the workpiece in two steps, and the fixed die cavity adopts high-strength inlaid hard alloy.

As shown in fig. 1 and 2, first, the axes of the first movable die 20 and the fixed die 10 are aligned on the same horizontal line, and the material is cut such that one end enters two thirds of the fixed die 10 and the other end faces the first movable die 20. A first cavity is arranged in the first die 22 of the first movable die 20, when one end of a workpiece enters the fixed die 10, the first movable die 20 moves towards the fixed die 10 along the axial direction, and the workpiece enters the first cavity; the first movable die 20 continues to move towards the fixed die 10, the workpiece extrudes the first thimble 24 to move towards the interior of the first die 22, the first thimble 24 and the first cushion block 23 can stretch and retract through the spring, because one end of the first cushion block 23 is fixedly connected in the die fixing sleeve 21, after the first thimble 24 contacts the first cushion block 23, the first cushion block 23 applies reverse pressure to the first thimble 24, and the first movable die 20 continues to move to gradually increase the pressure of the first cushion block 23, at this time, the raw material workpiece can be stressed and upset by the first cavity to complete one-time forming.

As shown in fig. 1 and 2, after the raw material workpiece is formed once, the first movable die 20 is retracted to expose one end of the workpiece, then the axis of the second movable die 30 is aligned with the fixed die 10, and the second movable die 30 moves toward the fixed die 10 to enter the workpiece into the second cavity; at this time, the second movable die 30 moves to enable the workpiece to extrude the second ejector pin 33 to move towards the inside of the second movable die 30, the second ejector pin 33 and the second cushion block 32 can stretch and retract through the spring, similarly, since the second cushion block 32 is fixedly connected to the inside of the second movable die 30, after the second ejector pin 33 contacts the second cushion block 32, the second cushion block 32 applies reverse pressure to the second ejector pin 33, the second movable die 30 continues to move to enable the pressure of the second cushion block 32 to be gradually increased, and the workpiece is upset in the second cavity to complete secondary forming.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the cold header die further comprises an ejection device 40, wherein the ejection device 40 is used for ejecting the workpiece; the ejection device 40 includes: an ejection outer sleeve body 41 with a groove arranged inside, a sliding seat 42, a safety tube 43 and an ejector rod 44; one end of the safety tube 43 is connected with the fixed die 10, the ejection outer sleeve 41 is sleeved on one end of the safety tube 43, the sliding seat 42 is sleeved on the safety tube 43 and is positioned between the fixed die 10 and the ejection outer sleeve 41, the push rod 44 is arranged in the safety tube 43, and one end of the push rod is connected with the sliding seat 42; a third cavity in the fixed mold 10 can accommodate the ejector pin 44; the ejecting outer sleeve 41 drives the sliding seat 42 and thus the ejector rod 44 to reciprocate.

As shown in fig. 3, since the ejector pin 44 has a too small diameter to be easily broken, it is disposed in the safety tube 43 to prevent it from being broken; after the work is upset, the second movable die 30 is retracted to expose one end of the work while the other end of the work is still inside the fixed die 10; one end of the safety tube 43 of the ejection device 40 protrudes from the inside of the ejection outer sleeve 41 and is fixedly connected with the fixed mold 10; after the workpiece is formed by cold heading, the outer ejecting sleeve body 41 drives the sliding seat 42 to move towards the fixed die 10, the sliding seat 42 drives the ejector rod 44 to move, one end of the ejector rod 44 enters a third cavity from the through hole of the middle sleeve 12 of the fixed die, and the formed workpiece is ejected from the other end of the fixed die 10 and naturally falls into a workpiece collecting box for next operation.

Example two

The utility model provides a cold heading machine, includes a cold heading machine mould, still includes: the automatic feeding device comprises a machine body 500, a driving mechanism 600 arranged on the machine body 500, a transmission mechanism connected with the driving mechanism 600 and a feeding mechanism; the central lines of the fixed die 10 and the movable die are positioned in the same vertical plane, and a gap is reserved between the fixed die 10 and the movable die; the driving mechanism 600 is used for driving a transmission mechanism, and the transmission mechanism drives the feeding mechanism and the cold header die to perform cold heading action;

the transmission mechanism comprises a transposition mechanism 710; the index mechanism 710 is configured to drive the first movable mold 20 and the second movable mold 30 to reciprocate, and includes: a first cam 711 connected with the driving mechanism 600, a first slider 714 connected with the driving mechanism 600, a reversing link 712 connected with the first cam 711, a second cam 713 connected with the reversing link 712, and a second slider 715 used in cooperation with the second cam 713; the second slider 715 is slidably disposed on the first slider 714;

the fixed die 10 is fixedly arranged on the machine body 500, and the movable die is arranged on the second slide block 715; the driving mechanism 600 drives the first slider 714 to reciprocate along the fixed die 10 in the axial direction; the first cam 711 rotates to drive the reversing link 712, thereby driving the second cam 713 to rotate so that the second slider 715 reciprocates in the radial direction of the fixed mold 10.

As shown in fig. 4 and 5, the fixed mold 10 and the movable mold are disposed opposite to each other, and when the material 900 is cold headed, the driving mechanism 600 drives the first slider 714 to reciprocate along the fixed mold 10 in the axial direction, so that the movable mold approaches to or departs from the fixed mold 10; as shown in fig. 6, the driving mechanism 600 drives the shifting mechanism 710 to reciprocate the second slider 715 along the radial direction of the fixed die 10, so that the first movable die 20 is aligned with the fixed die 10 or the second movable die 30 is aligned with the fixed die 10, and the two movable dies are alternatively upset by the cooperation of the first slider 714 and the second slider 715.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the transmission mechanism further includes: a driving cam 720, a feeding link 730, an ejecting link 740, and a shearing link 750 for driving;

the feeding mechanism comprises: the device comprises a straightener 810 arranged on the machine body 500, a feeding pressure wheel 820 arranged on one side of the straightener 810, a ratchet assembly 830 and a shearing assembly 840 connected with the feeding pressure wheel 820;

the driving mechanism 600 drives the transmission cam 720, the transmission cam 720 drives the feeding connecting rod 730 to move the ratchet assembly 830, and the ratchet assembly 830 drives the feeding pressing wheel 820 to rotate, so that a workpiece enters the shearing assembly 840;

the driving mechanism 600 drives the driving cam 720, the driving cam 720 drives the ejecting connecting rod 740, and the ejecting connecting rod 740 is connected with the ejecting device 40, so that the ejecting device 40 reciprocates.

As shown in fig. 5, the driving mechanism 600 drives the feeding mechanism through the transmission mechanism, and the ratchet 831 assembly 830 enables the raw material 900 to enter from the straightener 810; the driving mechanism 600 drives the ejecting link 740 to drive the ejecting device 40 to move through the transmission mechanism, so that the workpiece with the cold heading completed falls out from the fixed die 10.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the drive mechanism 600 includes: a motor, a first transmission gear 610, a crankshaft; the motor sets up on fuselage 500, the motor drives first drive gear 610, first drive gear 610 drives the motion of bent axle.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the cutting assembly 840 comprises a cutting fixed die 841 arranged on the machine body 500, a wedge 842 connected with a cutting connecting rod 750, a roller 843 arranged in the wedge 842, a cutting blade 844 arranged on the wedge 842 and a return spring 845; a shearing knife gland 846 is also arranged on the shearing knife 844;

the driving mechanism 600 drives the cutting link 750, the cutting link 750 drives the wedge 842 to move the roller 843, the roller 843 drives the cutting blade 844 to cut and feed, the return spring 845 is used for retracting the cutting blade 844, and the cutting blade 844 reciprocates along the radial direction of the fixed die 10.

In order to further optimize the above technical solution, the technical solution is preferably further provided with the following improvements: the ratchet assembly 830 includes: a ratchet wheel 831, a pawl 832, a transmission shaft 833 and a second transmission gear 834; the feeding connecting rod 730 is connected with a ratchet wheel 831 and a pawl 832, the ratchet wheel 831 drives a second transmission gear 834 through a transmission shaft 833, and the second transmission gear 834 drives the feeding pressing wheel 820 to rotate.

As shown in fig. 5, the driving mechanism 600 drives the driving cam 720 to rotate, the driving cam 720 drives the feeding link 730 to rotate the ratchet 831, the cooperation of the ratchet 831 and the pawl 832 converts the reciprocating motion into the unidirectional stepping motion, the raw material 900 is fed into the cutting fixed mold 841, and the feeding link 730 is designed to stop the motion after the ratchet 831 rotates for half a turn, so that the length of the raw material 900 is suitable for cutting; as shown in fig. 7, the driving mechanism 600 also drives the shearing link 750, the shearing link 750 drives the wedge 842 to move the roller 843, the roller 843 drives the shearing blade 844 to cut the raw material 900 extending from the shearing fixed mold 841, then the raw material 900 is clamped and moves towards the fixed mold 10, after the first movable mold 20 moves to push the raw material 900 into the fixed mold 10, the gland spring in the gland 846 of the shearing blade compresses to open the gland, and finally the return spring 845 drives the shearing blade 844 to retreat to the side of the shearing fixed mold 841, so that the raw material 900 can be left in the fixed mold 10; the raw material 900 is intermittently fed and sheared through the cooperation of the ratchet assembly 830 and the shearing assembly 840, so that the processing continuity is ensured.

In using the device, the first step is feeding. Firstly, the cold header is started, the driving mechanism 600 starts to operate, as shown in fig. 5, an operator sends the raw material 900 into the straightener 810, after the raw material 900 enters the feeding pinch roller 820 from the straightener 810, the driving mechanism 600 drives the ratchet assembly 830 to rotate the feeding pinch roller 820, the feeding pinch roller 820 compresses the raw material 900 and conveys the raw material 900 forward into the cutting and fixing mold 841 through rotation, and the ratchet assembly 830 stops after moving for a half circle, so that the workpieces enter the cutting and fixing mold 841 discontinuously, that is, after the front workpiece is cut off, the rear workpiece continues to move forward to wait for the next feeding, thereby improving the cold header efficiency of the whole cold header.

The second step is shear feeding. As shown in fig. 5 and 7, when the length of the raw material 900 extending from the cutting end of the cutting fixed die 841 reaches a desired length, the driving mechanism 600 drives the cutting assembly 840 to cut the end of the raw material 900 and move along the fixed die 10 in the radial direction to feed it to the end face of the fixed die 10, and then the driving mechanism 600 drives the shifting mechanism 710 to move the movable die toward the fixed die 10 to push the cut raw material 900 into the fixed die 10, at which time the cutting assembly 840 retracts to the cutting fixed die 841 to wait for a second feeding.

The third step is workpiece shaping. As shown in fig. 5 and 6, after the shifting mechanism 710 moves the first movable die 20 toward the fixed die 10 and pushes the raw material 900 into the fixed die 10, the first movable die 20 continues to move forward to cold-heading the workpiece for one-time forming; after upsetting is completed, the transposition mechanism 710 drives the first movable die 20 to retreat, simultaneously raises the second movable die 30 to the position where the center lines of the fixed dies 10 coincide, then enables the second movable die 30 to continue moving towards the fixed dies 10 to perform cold upsetting forming on the workpiece, and finally the transposition mechanism 710 retreats the second movable die 30 and lowers the first movable die 20 to the position where the center lines of the fixed dies 10 coincide to prepare for next cold upsetting. Meanwhile, the ratchet assembly 830 feeds the material 900 for the second time, and cooperates with the cold header mold to perform the next shearing.

The fourth step is workpiece ejection. As shown in fig. 5, the ejector 40 ejects the upset workpiece out of the fixed die 10, and then retracts to wait for the next shearing feed. The driving mechanism 600 drives the transmission cam 720 to move the ejecting connecting rod 740, one end of the ejecting connecting rod 740 is connected with the ejecting outer sleeve 41 of the ejecting device 40, and the ejecting outer sleeve 41 drives the ejector rod 44 to move to eject the workpiece.

In the prior art, the heating forming method has the problems that the thermal deformation is not well controlled, the appearance and the shape of a product are inconsistent, the subsequent processing is difficult, the manufacturing cost is increased, and the quality is difficult to control; in the method of first cold heading and then heating, the internal stress of metal after cold heading processing is increased sharply and is difficult to release, and the phenomenon of cracking is inevitable during subsequent processing, so that the cost is increased, and the rejection rate is increased due to cracking.

In the device, through research and test, 10B21 low-carbon alloy steel is used as a production raw material of the lead screw, and the 10B21 material has good elongation and plasticity, does not need tempering and treatment, can bear multiple times of cold deformation without generating cracks, and can successfully pass a whole machine bearing test. Before a workpiece is processed, the raw material needs to be tempered, phosphated, saponified and cold drawn to be in a softened and easily deformed state, so that the internal stress is reduced to an optimal state in the cold heading deformation process. Because the metal stress generated by the metal during multiple cold upsetting is concentrated on the end face of the tip, the depth of the stress concentration layer can be calculated according to the metal deformation; and (4) lengthening the workpiece subjected to cold heading forming, and then directly cutting off redundant end faces to remove the internal metal stress.

In conclusion, the movable die and the fixed die 10 are matched to enable the workpiece to be directly formed by cold heading, the cold heading forming and continuous cold pressing are free of cracks, the strength of the workpiece can be enhanced, the production efficiency and the product quality are improved, the product manufacturing cost is reduced, the appearance of the workpiece is well improved, and the service life is prolonged.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The utility model provides a cold heading machine mould which characterized in that: the method comprises the following steps: a movable mold and a fixed mold (10), the movable mold including a first movable mold (20) and a second movable mold (30); the first movable die (20) and the fixed die (10) are matched for one-time forming, and the second movable die (30) and the fixed die (10) are matched for two-time forming;

the first movable mold (20) includes: the device comprises a hollow die fixing sleeve (21), a first die (22) and a first extrusion assembly which are coaxially arranged inside the die fixing sleeve (21); a first cavity for forming a workpiece is arranged in the first die (22), and the first extrusion assembly is used for controlling the workpiece to move;

the second movable mold (30) includes: a second die (31) and a second extrusion assembly disposed within the second die (31); a second cavity for forming a workpiece is arranged in the second die (31), and the second extrusion assembly is used for controlling the workpiece to move;

the fixed die (10) is internally provided with a third cavity for accommodating and forming a workpiece.

2. The cold header die of claim 1, wherein: the first compression assembly includes: a first telescopic cushion block (23) and a first thimble (24) which are arranged in the die fixing sleeve (21); one end of the first mold (22) extends out of the mold fixing sleeve (21) and is internally provided with a through hole, the first cushion block (23) is arranged at one end which is relatively far away from the first mold (22), one end of the first ejector pin (24) is arranged in the first mold (22), and the other end of the first ejector pin extends out of the first mold (22) and faces the first cushion block (23).

3. The cold header die of claim 1, wherein: the second compression assembly includes: a second retractable cushion block (32) and a second ejector pin (33) which are arranged in the second die (31); and through holes for accommodating a second cushion block (32) and a second thimble (33) are formed in the second die (31), and the second cushion block (32) can stretch and retract in the second die (31).

4. The cold header die of claim 1, wherein: the fixed die (10) includes: the inner part of the fixed die cavity is provided with a fixed die cavity (11) of a third die cavity, a fixed die middle sleeve (12) sleeved outside the fixed die cavity (11) and a fixed die outer sleeve (13) sleeved outside the fixed die middle sleeve (12), and one end of the fixed die middle sleeve (12) is axially provided with a through hole communicated with the third die cavity.

5. The cold header die of claim 1, wherein: the cold header die further comprises an ejection device (40), wherein the ejection device (40) is used for ejecting the workpiece; the ejection device (40) comprises: an ejection outer sleeve body (41) with a groove arranged inside, a sliding seat (42), a safety tube (43) and an ejector rod (44); one end of the safety pipe (43) is connected with the fixed die (10), the ejection outer sleeve body (41) is sleeved at one end of the safety pipe (43), the sliding seat (42) is sleeved on the safety pipe (43) and is positioned between the fixed die (10) and the ejection outer sleeve body (41), the ejector rod (44) is arranged in the safety pipe (43) and one end of the ejector rod is connected with the sliding seat (42); a third cavity in the fixed die (10) can accommodate a mandril (44); the ejection outer sleeve body (41) drives the sliding seat (42) so as to drive the ejector rod (44) to reciprocate.

6. The utility model provides a cold heading machine which characterized in that: a cold header die comprising any one of claims 1 to 5, further comprising: the feeding device comprises a machine body (500), a driving mechanism (600) arranged on the machine body (500), a transmission mechanism connected with the driving mechanism (600) and a feeding mechanism; the central lines of the fixed die (10) and the movable die are positioned in the same vertical plane, and a gap is reserved between the fixed die (10) and the movable die; the driving mechanism (600) is used for driving the transmission mechanism, and the transmission mechanism drives the feeding mechanism and the cold header die to perform cold heading action;

the transmission mechanism comprises a transposition mechanism (710); the transposition mechanism (710) is used for driving the first movable die (20) and the second movable die (30) to reciprocate, and comprises: the device comprises a first cam (711) connected with a driving mechanism (600), a first sliding block (714) connected with the driving mechanism (600), a reversing connecting rod (712) connected with the first cam (711), a second cam (713) connected with the reversing connecting rod (712) and a second sliding block (715) matched with the second cam (713); the second sliding block (715) is slidably arranged on the first sliding block (714);

the fixed die (10) is fixedly arranged on the machine body (500), and the movable die is arranged on the second sliding block (715); the driving mechanism (600) drives the first sliding block (714) to reciprocate along the axial direction of the fixed die (10); the first cam (711) rotates to drive the reversing connecting rod (712), so as to drive the second cam (713) to rotate, and the second sliding block (715) reciprocates along the radial direction of the fixed die (10).

7. A cold heading machine as claimed in claim 6 wherein: the transmission mechanism further includes: a transmission cam (720), a feeding connecting rod (730), an ejecting connecting rod (740) and a shearing connecting rod (750) which are used for transmission;

the feeding mechanism comprises: the device comprises a straightener (810) arranged on a machine body (500), a feeding pressure wheel (820) arranged on one side of the straightener (810), a ratchet assembly (830) and a shearing assembly (840) which are connected with the feeding pressure wheel (820);

the driving mechanism (600) drives the transmission cam (720), the transmission cam (720) drives the feeding connecting rod (730) to enable the ratchet wheel assembly (830) to move, and the ratchet wheel assembly (830) drives the feeding pressing wheel (820) to rotate, so that a workpiece enters the shearing assembly (840);

the driving mechanism (600) drives the transmission cam (720), the transmission cam (720) drives the ejection connecting rod (740), and the ejection connecting rod (740) is connected with the ejection device (40) so as to enable the ejection device (40) to reciprocate.

8. A cold heading machine as claimed in claim 6 wherein: the drive mechanism (600) comprises: a motor, a first transmission gear (610), a crankshaft; the motor sets up on fuselage (500), the motor drives first drive gear (610), first drive gear (610) drive the crankshaft motion.

9. A cold heading machine as claimed in claim 7, wherein: the shearing assembly (840) comprises a shearing fixed die (841) arranged on the machine body (500), a wedge block (842) connected with the shearing connecting rod (750), a roller (843) arranged in the wedge block (842), a shearing knife (844) arranged on the wedge block (842) and a return spring (845); a shearing knife gland (846) is also arranged on the shearing knife (844);

the driving mechanism (600) drives the shearing connecting rod (750), the shearing connecting rod (750) drives the wedge block (842) to enable the roller (843) to move, the roller (843) drives the shearing knife (844) to cut and feed materials, the return spring (845) is used for enabling the shearing knife (844) to retreat, and the shearing knife (844) does reciprocating motion along the radial direction of the fixed die (10).

10. A cold heading machine as claimed in claim 7, wherein: the ratchet assembly (830) comprises: a ratchet wheel (831), a pawl (832), a transmission shaft (833) and a second transmission gear (834); the feeding connecting rod (730) is connected with a ratchet wheel (831) and a pawl (832), the ratchet wheel (831) drives a second transmission gear (834) through a transmission shaft (833), and the second transmission gear (834) drives a feeding pressing wheel (820) to rotate.