Two-die four-punch cold header

Abstract

The invention discloses a two-die four-punch cold header which comprises a lathe bed, a feeding unit, a cutting unit, a main sliding table, a die lifting unit, a main die box, a first transmission unit and a clamping unit, the lathe bed is rotationally connected with a main crankshaft, a main transmission shaft and a swing shaft, and a lifting cam is arranged at the tail end of the main transmission shaft; the main sliding table is horizontally and slidably connected with the lathe bed; the mold lifting unit comprises a lifting seat, a swinging mechanism, a first connecting rod, a second connecting rod and a limiting mechanism; the lifting cam drives the swing mechanism to swing around the axis of the swing shaft in a reciprocating mode to drive the swing shaft to conduct fixed-angle reciprocating rotation, so that the first connecting rod and the second connecting rod are in linkage to drive the lifting base to do lifting motion. The first transmission unit is arranged on the lathe bed and driven by the main crankshaft. According to the two-die four-punch cold header provided by the invention, the movement gravity center of the lifting seat is kept on the same vertical line, so that the horizontal unbalance loading force is effectively eliminated, the lifting seat is prevented from swinging back and forth, and the precise matching of the punch die and the fixed die is ensured.

Description

Technical Field

[0001] The present invention relates to the field of cold heading machines, and particularly to a two-mode four-stroke cold heading machine. Background Art

[0002] As a key device in the field of metal plastic forming, a cold heading machine realizes the efficient processing of parts through a multi-station continuous stamping process. Among them, the one-mode two-stroke technology drives the die to lift and lower at a single station to perform two stampings on the same workpiece, which is particularly suitable for the processing of workpieces with complex shapes and difficult clamping. To implement this process, in the prior art, a lifting seat that slides vertically is usually arranged on the main slide table, and a die holder is installed at its front end. The lifting seat is driven to move up and down by a die lifting device, so that two vertically arranged dies on the die holder alternately cooperate with the fixed die to complete the stamping. However, the existing die lifting device has the technical problem of insufficient stability in driving the lifting seat to move up and down.

[0003] Taking the patent with the publication number CN106270358B in the prior art as an example, it discloses a one-mode three-stroke double-metal composite contact cold heading machine, which specifically discloses that the upper and lower punching mechanisms drive the die holder to lift and lower through a slider link: the flywheel drives the second driven wheel to drive the third link to swing, and the third link drives the slider to slide in the horizontal chute at the bottom of the upper and lower die holders, converting the horizontal lateral displacement of the slider into the vertical lifting movement of the die holder, so as to realize the alternate stamping of the first die and the second die. Although this structure simplifies the transmission path, in actual operation, the contact point between the slider and the horizontal chute continuously moves horizontally with the swing of the link, resulting in the periodic movement of the center of gravity of the die holder in the horizontal direction. This dynamic imbalance will cause an eccentric load force, causing the die holder to swing back and forth, and further reducing the matching accuracy between the die fixed on the die holder and the main die, seriously affecting the processing accuracy of the stamped parts. In addition, the die lifting device is integrated inside the bed body, with a compact structure and limited space for adjustment and maintenance, increasing the maintenance cost and operation difficulty.

[0004] It can be seen that the prior art still needs to be improved and enhanced. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a two-mode four-stroke cold heading machine, aiming to solve the technical problems of the swing of the die holder and the decrease in stamping accuracy caused by insufficient dynamic stability of the die lifting device in the prior art, as well as the difficulty in adjustment and maintenance.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A two-mode four-stroke cold heading machine, comprising:

[0008] The bed body is rotatably connected with a main crankshaft and a main transmission shaft which are in transmission connection with each other. The end of the main transmission shaft extends to the outside of the bed body and is provided with a lifting cam. The bed body is also rotatably connected with a swing shaft, and the end of the swing shaft extends to the outside of the bed body.

[0009] The feeding unit is arranged on the bed body and is used for conveying wire materials.

[0010] The cutting unit is arranged on the bed body and is used for cutting the wire materials conveyed by the feeding unit into bar materials.

[0011] The main slide table is horizontally slidably connected with the bed body.

[0012] The die lifting unit includes a lifting seat, a swing mechanism, a first connecting rod, a second connecting rod and a limiting mechanism. The lifting seat is vertically slidably connected with the main slide table, and the lifting seat is provided with at least one punching die seat. The swing mechanism connects the lifting cam and the end of the swing shaft. One end of the first connecting rod is fixedly arranged on the swing shaft, one end of the second connecting rod is hinged to the other end of the first connecting rod, and the other end is hinged to the bottom of the lifting seat. The limiting mechanism is used for limiting the lifting range of the lifting seat. Among them, the lifting cam drives the swing mechanism to reciprocally swing around the axis line of the swing shaft, drives the swing shaft to perform a reciprocating rotation at a fixed angle, and enables the first connecting rod and the second connecting rod to be linked to drive the lifting seat to perform a lifting motion.

[0013] The main die box is fixedly arranged on the bed body and is correspondingly arranged with the main slide table. At least one fixed die is arranged on the main die box.

[0014] The first transmission unit is arranged on the bed body and is driven by the main crankshaft, and is used for driving the main slide table to reciprocally move.

[0015] The material clamping unit is arranged on the bed body and is used for clamping the bar materials to different work positions.

[0016] Further, the swing mechanism includes a swing seat fixedly arranged at the end of the swing shaft, an upper swing arm and a lower swing arm respectively hinged on both sides of the swing seat, and a buffer spring connecting the ends of the upper swing arm and the lower swing arm. The lifting cam is respectively in contact and cooperation with the upper swing arm and the lower swing arm.

[0017] Further, an extension section is arranged on the swing seat between the upper swing arm and the lower swing arm. A first adjusting screw is screwed on the upper swing arm, and a second adjusting screw is screwed on the lower swing arm. The first adjusting screw and the second adjusting screw respectively abut against the extension section to control the swing amplitude of the swing seat.

[0018] Further, the limiting mechanism includes a portal frame fixedly arranged at the top of the lifting seat, a third adjusting screw screwed on the top of the portal frame, a fourth adjusting screw screwed on the top of the lifting seat, and a collision block fixedly arranged on the top of the main slide table and located between the third adjusting screw and the fourth adjusting screw.

[0019] Further, a support shaft is arranged on the main slide table. The first transmission unit includes:

[0020] A third connecting rod, the lower end of which is rotatably connected to the eccentric journal of the main crankshaft;

[0021] A fourth connecting rod, the middle part of which is rotatably connected to the bed body, one end of which is hinged to the upper end of the third connecting rod, and the other end of which is provided with a counterweight;

[0022] A fifth connecting rod, one end of which is pivotally hinged and the other end of which is hinged to the upper end of the third connecting rod for pushing the main slide table to reciprocate.

[0023] Further, it further includes a front outlet unit, and the front outlet unit includes:

[0024] A base plate, fixedly arranged on the bed body and located above the main slide table, and a cam strip is arranged at the bottom of the base plate;

[0025] An outlet slider, which is horizontally slidably connected to the main slide table;

[0026] A front outlet rocker arm, which is rotatably connected to the main slide table. The front outlet rocker arm has a T-shaped structure, the front end of which extends to form an auxiliary section, the rear end of which extends to form a driving section in contact and cooperation with the cam strip, and the bottom of which extends to form an ejecting section in contact with the outlet slider;

[0027] An auxiliary spring, arranged between the auxiliary section and the main slide table;

[0028] A return spring, arranged between the driving section and the main slide table.

[0029] Further, the clamping unit includes:

[0030] A clamping table, fixedly arranged on the bed body;

[0031] A sliding seat, slidably connected to the clamping table;

[0032] A second transmission unit, arranged on the bed body, and the main crankshaft drives the sliding seat to reciprocate through the second transmission unit;

[0033] A left clamping jaw assembly, including a first rotating shaft, a first clamping arm, a common shaft, a second clamping arm and a first adjusting column. The first rotating shaft is rotatably connected to the sliding seat and the end is connected to the first clamping arm. The common shaft is arranged on the clamping table and is rotatably connected to the second clamping arm. A first waist-shaped hole is formed on the first clamping arm. One end of the first adjusting column is rotatably connected to the second clamping arm, and the other end is slidably connected to the first waist-shaped hole. The first clamping arm and the second clamping arm cooperate to clamp the bar stock;

[0034] The right jaw assembly includes a second rotating shaft, a third jaw arm, a fourth jaw arm, and a second adjusting column. The second rotating shaft is rotatably connected to the slide and its end is connected to the third jaw arm. The fourth jaw arm is rotatably connected to the common shaft. A second waist-shaped hole is formed in the fourth jaw arm. One end of the second adjusting column is rotatably connected to the third jaw arm and the other end is slidably connected to the second waist-shaped hole. The third jaw arm and the fourth jaw arm cooperate to clamp the bar stock.

[0035] A tension spring is arranged between the first jaw arm and the third jaw arm.

[0036] The unclamping mechanism is arranged on the clamping table and is used to drive the first rotating shaft and the second rotating shaft to rotate.

[0037] Further, the distance between the axis of the first rotating shaft and the clamping center of the first jaw arm and the second jaw arm is greater than the distance between the axis of the common shaft and the clamping center of the first jaw arm and the second jaw arm.

[0038] The distance between the axis of the second rotating shaft and the clamping center of the third jaw arm and the fourth jaw arm is greater than the distance between the axis of the common shaft and the clamping center of the third jaw arm and the fourth jaw arm.

[0039] Further, the unclamping mechanism includes:

[0040] The unclamping shaft is rotatably connected to the clamping table and is provided with a first cam assembly and a second cam assembly.

[0041] The third transmission unit is arranged on the machine body. The second transmission unit drives the unclamping shaft to rotate through the third transmission unit.

[0042] The first lever assembly is rotatably connected to the clamping table. One end of it is in contact and cooperation with the first cam assembly, and the other end is provided with a first pressing strip. A first pressing arm is arranged on the first rotating shaft. The first pressing strip is used to press down the first pressing arm to drive the first rotating shaft to rotate.

[0043] The second lever assembly is rotatably connected to the clamping table. One end of it is in contact and cooperation with the second cam assembly, and the other end is provided with a second pressing strip. A second pressing arm is arranged on the second rotating shaft. The second pressing strip is used to press down the second pressing arm to drive the second rotating shaft to rotate.

[0044] Further, the feeding unit includes:

[0045] The mounting seat is fixedly arranged on the machine body.

[0046] The feeding mechanism is arranged on the mounting seat, and its input end is provided with a feeding shaft.

[0047] The feeding rocker arm is rotatably connected to the end of the feeding shaft. One end of the feeding rocker arm is rotatably connected with a feeding ratchet.

[0048] The fourth transmission unit is arranged on the machine body, and the second transmission unit drives the feeding swing arm to swing reciprocally through the fourth transmission unit;

[0049] The ratchet wheel is fixedly arranged on the feeding shaft;

[0050] The feeding air cylinder is fixedly arranged at one end of the feeding swing arm, and its extending rod is connected with the feeding ratchet pawl to control the contact or separation between the feeding ratchet pawl and the ratchet wheel.

[0051] Advantageous effects:

[0052] The present invention provides a two-mode four-stroke cold heading machine. Through the reciprocating motion of the main slide table and the linkage of the die lifting unit, the double punch die realizes continuous two-time stamping forming of the workpiece at the same working station. The lifting seat moves up and down in the vertical direction under the drive of the swing mechanism, the first connecting rod and the second connecting rod, and its center of motion is always on the same vertical line, effectively eliminating the horizontal eccentric load force, avoiding the problem that the lifting seat swings back and forth and causes the position deviation of the punch die, and ensuring the precise cooperation between the punch die and the fixed die. And in cooperation with the material clamping unit, the rapid transfer of the workpiece between the working stations realizes the efficient and stable operation of the two-mode four-stroke process. Description of the drawings

[0053] Figure 1 is the structure of the two-mode four-stroke cold heading machine provided by the present invention Figure 1 ;

[0054] Figure 2 is the structure of the two-mode four-stroke cold heading machine provided by the present invention Figure 2 ;

[0055] Figure 3 is the structure of the two-mode four-stroke cold heading machine provided by the present invention Figure 3 ;

[0056] Figure 4 is the cross-sectional view of the two-mode four-stroke cold heading machine provided by the present invention;

[0057] Figure 5 is the exploded view of the die lifting unit in the two-mode four-stroke cold heading machine provided by the present invention;

[0058] Figure 6 is the cross-section of the die lifting unit in the two-mode four-stroke cold heading machine provided by the present invention Figure 1 ;

[0059] Figure 7 is the cross-section of the die lifting unit in the two-mode four-stroke cold heading machine provided by the present invention Figure 2 ;

[0060] Figure 8 is the cross-section of the front through unit in the two-mode four-stroke cold heading machine provided by the present invention Figure 1 ;

[0061] Figure 9 Explosion diagram of the front outlet unit in the two-mode four-stroke cold heading machine provided by the present invention;

[0062] Figure 10 Cross-section of the front outlet unit in the two-mode four-stroke cold heading machine provided by the present invention Figure 2 ;

[0063] Figure 11 Partial structure diagram of the two-mode four-stroke cold heading machine provided by the present invention;

[0064] Figure 12 Structure diagram of the material clamping unit in the two-mode four-stroke cold heading machine provided by the present invention;

[0065] Figure 13 Explosion diagram of the material clamping unit in the two-mode four-stroke cold heading machine provided by the present invention;

[0066] Figure 14 Cross-sectional view of the material clamping unit in the two-mode four-stroke cold heading machine provided by the present invention;

[0067] Figure 15 Schematic diagram of the open state of the clamping arm in the two-mode four-stroke cold heading machine provided by the present invention;

[0068] Figure 16 Structure diagram of the first adjusting column in the two-mode four-stroke cold heading machine provided by the present invention;

[0069] Figure 17 Explosion diagram of the feeding unit in the two-mode four-stroke cold heading machine provided by the present invention.

[0070] Reference numerals: Bed 1, main crankshaft 11, main transmission shaft 12, lifting cam 13, first arc surface 131, second arc surface 132, transition surface 133, swing shaft 14;

[0071] Feeding unit 2, mounting seat 21, feeding mechanism 22, feeding shaft 221, driven assembly 222, lower gear 2221, lower feeding wheel 2222, upper gear 2223, upper feeding wheel 2224, transmission gear 223, feeding rocker arm 23, feeding pawl 24, fourth transmission unit 25, rear outlet cross shaft 251, adjusting disc 252, adjusting chute 2521, feeding slider 2522, feeding connecting rod 253, ratchet 26, feeding cylinder 27;

[0072] Cutting unit 3; Main slide 4, support shaft 41, dovetail chute 42, second installation cavity 43, first installation cavity 44;

[0073] Mold lifting unit 5, lifting seat 51, gantry 511, swinging mechanism 52, swinging seat 521, extension section 5211, upper swing arm 522, lower swing arm 523, buffer spring 524, first adjustment screw 525, second adjustment screw 526, first screw rod 527, first locking nut 5271, first roller 528, first connecting rod 53, second connecting rod 54, limiting mechanism 55, third adjustment screw 551, fourth adjustment screw 552, striking block 553, die holder 56, die 561, second ejecting hole 562, ejector pin 563;

[0074] Main mold box 6, fixed mold 61, first ejecting hole 62; First transmission unit 7, third connecting rod 71, fourth connecting rod 72, counterweight 721, fifth connecting rod 73;

[0075] Material clamping unit 8, clamping table 81, first straight rod 811, second straight rod 812, return spring 813, guide rod 814, sliding seat 82, second transmission unit 83, transmission cross shaft 831, clamping table cam 832, clamping table rocker arm 833, clamping table connecting rod 834, left clamping jaw assembly 84, first rotating shaft 841, first pressing arm 8411, fourth roller 8412, first clamping arm 842, first waist-shaped hole 8421, common shaft 843, second clamping arm 844, first adjusting column 845, first part 8451, second part 8452, third part 8453, right clamping jaw assembly 85, second rotating shaft 851, second pressing arm 8511, fifth roller 8512, third clamping arm 852, fourth clamping arm 853, second waist-shaped hole 8531, second adjusting column 854, tension spring 86, clamping opening mechanism 87, clamping opening shaft 871, first cam assembly 872, clamping opening cam 8721, second cam assembly 873, third transmission unit 874, first lever assembly 875, first pressing strip 8751, pushing block 8752, pressing block 8753, third roller 8754, second lever assembly 876, second pressing strip 8761;

[0076] Front outlet unit 9, base plate 91, adjustment groove 911, fifth adjustment screw 912, set screw 913, cam strip 92, outlet arc surface 921, return plane 922, outlet slider 93, front outlet rocker arm 94, auxiliary section 941, second screw rod 9411, driving section 942, third screw rod 9421, second roller 9422, ejecting section 943, protrusion 9431, auxiliary spring 95, return spring 96;

[0077] Rear outlet unit 10, rear outlet cam 101, rear outlet ejector rod 102, rear outlet rocker arm 103. Specific embodiments

[0078] The present invention provides a two-die four-blow cold heading machine. To make the purpose, technical solution, and effects of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention.

[0079] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0080] In the present invention, “front” refers to the direction in which the main slide 4 moves toward the main mold box 6 , and “back” is opposite to the “front” direction.

[0081] See also Figures 1 to 17 As shown, the present invention provides a two-die four-blow cold heading machine, comprising: a bed 1, a feeding unit 2, a feeding unit 2, a cutting unit 3, a main slide 4, a die lifting unit 5, a main die box 6, a first transmission unit 7 and a clamping unit 8,

[0082] The bed 1 is rotatably connected to a main crankshaft 11 and a main transmission shaft 12, which are in transmission connection with each other. The end of the main transmission shaft 12 extends to the outside of the bed 1 and is provided with a lifting cam 13. The bed 1 is also rotatably connected to a swing shaft 14, the end of which extends to the outside of the bed 1. A feeding unit 2 is provided on the bed 1 for conveying wires. A cutting unit 3 is provided on the bed 1 for cutting the wires conveyed by the feeding unit 2 into rods. A main slide 4 is horizontally slidably connected to the bed 1.

[0083] The mold lifting unit 5 includes a lifting seat 51, a swing mechanism 52, a first connecting rod 53, a second connecting rod 54, and a limiting mechanism 55. The lifting seat 51 is vertically slidably connected to the main slide table 4, and the lifting seat 51 is provided with at least one die holder 56; the swing mechanism 52 is connected to the lifting cam 13 and the end of the swing shaft 14; one end of the first connecting rod 53 is fixedly arranged on the swing shaft 14, one end of the second connecting rod 54 is hinged to the other end of the first connecting rod 53, and the other end is hinged to the bottom of the lifting seat 51; the limiting mechanism 55 is used to limit the lifting range of the lifting seat 51; wherein the lifting cam 13 drives the swing mechanism 52 to reciprocally swing around the axis of the swing shaft 14, drives the swing shaft 14 to perform a reciprocating rotation at a fixed angle, so that the first connecting rod 53 and the second connecting rod 54 are linked to drive the lifting seat 51 to perform a lifting motion;

[0084] The main die box 6 is fixedly arranged on the machine body 1 and is correspondingly arranged with the main slide table 4. The main die box 6 is provided with at least one fixed die 61; the first transmission unit 7 is arranged on the machine body 1 and is driven by the main crankshaft 11, and is used to drive the main slide table 4 to reciprocally move; the material clamping unit 8 is arranged on the machine body 1 and is used to clamp the bar stock to different work positions.

[0085] In actual work, the main crankshaft 11 is driven to rotate by a motor, and the motor is not shown in the drawings. The main crankshaft 11 drives the main transmission shaft 12 to rotate through a gear transmission assembly. The main transmission shaft 12 drives the feeding unit 2, the cutting unit 3, the material clamping unit 8, and the mold lifting unit 5 to move. The main crankshaft 11 drives the main slide table 4 to move through the first transmission unit 7 to realize driving each component to act.

[0086] In the above, the die holder 56 includes two dies 561 arranged at intervals in the vertical direction. Through the up and down movement of the lifting seat 51, the two dies 561 are alternately matched with the fixed die 61 to complete two stamping operations on the workpiece at the same work position.

[0087] The feeding unit 2 conveys the wire rod into the machine body 1, and the cutting unit 3 cuts the wire rod into bar stock; the material clamping unit 8 clamps the bar stock from the cutting work position to the first stamping work position of the main die box 6 to align it with the first fixed die 61; the first transmission unit 7 drives the main slide table 4 to move forward. At this time, the lifting seat 51 is at the initial low position, and the upper die 561 cooperates with the fixed die 61 to complete the first stamping of the bar stock. The main slide table 4 retreats and then moves forward. The main transmission shaft 12 drives the lifting cam 13 to rotate, drives the swing shaft 14 to swing through the swing mechanism 52. The first connecting rod 53 swings upward with the swing shaft 14 and pushes the second connecting rod 54 upward, so that the lifting seat 51 moves upward, and the lower die 561 moves upward to be coaxial with the fixed die 61. This die 561 cooperates with the fixed die 61 to complete the second stamping of the same workpiece.

[0088] Subsequently, the main slide table 4 is driven by the first transmission unit 7 to retract and then move forward again. The blank clamping unit 8 transfers the workpiece after secondary stamping to the next stamping station, and at the same time transfers the newly cut bar stock to the first stamping station. During this process, the lifting cam 13 drives the swing shaft 14 to swing in the opposite direction through the swing mechanism 52. The first connecting rod 53 swings downward with the swing shaft 14 and pulls down the second connecting rod 54, causing the lifting seat 51 to move downward. The upper die 561 moves downward to be coaxial with the fixed die 61, and the upper die 561 cooperates with the fixed die 61 to perform the first stamping of the next workpiece.

[0089] Through the articulated design of the second connecting rod 54 with the lifting seat 51 and the first connecting rod 53, the center of gravity of the movement trajectory of the lifting seat 51 is always located on the same vertical line, effectively eliminating the horizontal eccentric load force, avoiding the problem of the position deviation of the upper die 561 caused by the front and back swing of the lifting seat 51, and ensuring the precise cooperation between the upper die 561 and the fixed die 61.

[0090] In addition, the lifting cam 13 and the swing mechanism 52 are externally arranged outside the bed body 1, so that it is convenient to directly perform real-time adjustment and maintenance operations on key components such as the lifting cam 13 and the swing mechanism 52 outside the bed body 1, significantly improving the maintainability and debugging efficiency.

[0091] In a preferred embodiment, refer to Figure 5 、 6 、7, the swing mechanism 52 includes a swing seat 521 fixed at the end of the swing shaft 14, an upper swing arm 522 and a lower swing arm 523 respectively articulated on both sides of the swing seat 521, and a buffer spring 524 connecting the ends of the upper swing arm 522 and the lower swing arm 523. The lifting cam 13 is in contact and cooperation with the upper swing arm 522 and the lower swing arm 523 respectively.

[0092] Specifically, the lifting cam 13 includes a first arc surface 131, a second arc surface 132, and a transition surface 133 connecting the first arc surface 131 and the second arc surface 132. The radius of the first arc surface 131 is greater than the radius of the second arc surface 132. The lifting cam 13 is in alternating contact and cooperation with the upper swing arm 522 and the lower swing arm 523 through different arc surfaces. Preferably, the upper swing arm 522 and the lower swing arm 523 are respectively rotatably connected with a first roller 528, and the outer peripheral surface of the first roller 528 is in rolling contact and cooperation with the first arc surface 131, the transition surface 133, and the second arc surface 132 of the lifting cam 13.

[0093] In the above, the limiting mechanism 55 defines the upper limit position and the lower limit position for the movement of the lifting seat 51. The distance between the upper limit position and the lower limit position is the lifting range of the lifting seat 51, which is the spacing between the two punching dies 561 on the punching die seat 56. When the lifting seat 51 moves upward to the upper limit position, the lower punching die 561 is coaxial with the fixed die 61 to complete punching; when the lifting seat 51 moves downward to the lower limit position, the upper punching die 561 is coaxial with the fixed die 61 to complete punching.

[0094] The main drive shaft 12 drives the lifting cam 13 to rotate clockwise. When the upper swing arm 522 contacts the transition surface 133 along the second arc surface 132 towards the first arc surface 131, it drives the swing seat 521 to swing downward around the axis line of the swing shaft 14. The first connecting rod 53 swings downward with the swing shaft 14 and pulls the second connecting rod 54 downward, and the lifting seat 51 moves downward to the lower limit position. If the first arc surface 131 still has not transitioned to contact the upper swing arm 522 at this time, the buffer spring 524 contracts to adjust the angle between the upper swing arm 522 and the swing seat 521, restricting the swing seat 521 from continuing to swing downward and pulling the lifting seat 51. Subsequently, the main drive shaft 12 continues to drive the lifting cam 13 to swing clockwise. When the lower swing arm 523 contacts the transition surface 133 along the second arc surface 132 towards the first arc surface 131, it drives the swing seat 521 to swing upward around the axis line of the swing shaft 14. The first connecting rod 53 swings upward with the swing shaft 14 and pushes the second connecting rod 54 upward, and the lifting seat 51 moves upward to the upper limit position. If the first arc surface 131 still has not transitioned to contact the lower swing arm 523 at this time, the buffer spring 524 contracts to adjust the angle between the lower swing arm 523 and the swing seat 521, restricting the swing seat 521 from continuing to swing upward and pushing the lifting seat 51. Through the elastic deformation of the buffer spring 524 and the angle adaptive adjustment of the upper swing arm 522 and the lower swing arm 523, impact buffering and swing amplitude control of the swing seat 521 are achieved at the moment when the lifting seat 51 moves to the limit position, effectively avoiding the over-travel operation of the lifting seat 51.

[0095] Further, refer to Figure 7, an extension section 5211 is provided on the swing seat 521 between the upper swing arm 522 and the lower swing arm 523. A first adjustment screw 525 is screwed onto the upper swing arm 522, and a second adjustment screw 526 is screwed onto the lower swing arm 523. The first adjustment screw 525 and the second adjustment screw 526 respectively abut against the extension section 5211 to control the swing amplitude of the swing seat 521, thereby accurately adjusting the lifting stroke of the lifting seat 51. Taking the upward movement process of the lifting seat 51 as an example, during the process that the lower swing arm 523 contacts the transition surface 133 along the second arc surface 132 towards the first arc surface 131, the end of the first adjustment screw 525 abuts against the extension section 5211, the swing seat 521 swings upward, and the first connecting rod 53 swings upward along the swing shaft 14 and pushes up the second connecting rod 54, causing the lifting seat 51 to move upward; if at this time the first arc surface 131 has been transitioned to contact the lower swing arm 523 and the lifting seat 51 still has not reached the upper limit position, it indicates that the lifting seat 51 has not reached the preset stroke, and the first adjustment screw 525 can be screwed in to drive the swing seat 521 to swing further upward, forcing the second connecting rod 54 to continue to push up the lifting seat 51 to the upper limit position.

[0096] Similarly, when the lifting seat 51 moves downward and has not reached the lower limit position, the second adjustment screw 526 is screwed in to drive the swing seat 521 to swing further downward, forcing the second connecting rod 54 to pull down the lifting seat 51 to the lower limit position.

[0097] In practical applications, the screwing depths of the first adjustment screw 525 and the second adjustment screw 526 should be dynamically adjusted according to the movement state of the equipment to ensure that the lifting seat 51 achieves full stroke coverage between the upper limit position and the lower limit position, thereby ensuring the accurate alignment of the punching die 561 and the fixed die 61.

[0098] In the above embodiment, the end of the upper swing arm 522 is hinged to a first screw rod 527. A through hole is provided at the end of the lower swing arm 523. After the first screw rod 527 passes through the through hole, two first locking nuts 5271 are screwed thereon. The buffer spring 524 is sleeved on the first screw rod 527, and the two ends respectively abut against the lower swing arm 523 and the first locking nut 5271. By screwing the two first locking nuts 5271, the pre-tightening compression amount of the buffer spring 524 can be adjusted, thereby controlling the buffer force of the buffer spring 524 to ensure that the buffer spring 524 plays a role of buffering and unloading force on the swing mechanism 52 when the lifting seat 51 reaches the limit position.

[0099] Among them, the interlocking design of the double first locking nuts 5271 can effectively prevent the nuts from loosening caused by the vibration of the equipment, ensuring the long-term stability of the installation of the buffer spring 524.

[0100] In a preferred embodiment, refer to Figure 5 、 8, the limiting mechanism 55 includes a portal frame 511 fixedly arranged at the top of the lifting seat 51, a third adjusting screw 551 screwed to the top of the portal frame 511, a fourth adjusting screw 552 screwed to the top of the lifting seat 51, and a striker 553 fixedly arranged at the top of the main slide 4 and located between the third adjusting screw 551 and the fourth adjusting screw 552. By screwing the third adjusting screw 551, the lower limit position of the lifting seat 51 can be adjusted. When the third adjusting screw 551 contacts the striker 553, the upper punch die 561 and the fixed die 61 are precisely coaxially aligned; by screwing the fourth adjusting screw 552, the lower limit position of the lifting seat 51 can be adjusted. When the fourth adjusting screw 552 contacts the striker 553, the lower punch die 561 and the fixed die 61 are precisely coaxially aligned; the installation requirements of different specifications of punch die seats 56 can be quickly adapted through fine-thread adjustment.

[0101] In a preferred embodiment, refer to Figure 5 , a dovetail chute 42 extending in the vertical direction is arranged on the main slide 4, and the lifting seat 51 is slidably connected to the dovetail chute 42. Through the trapezoidal cross-section design of the dovetail chute 42, the contact area between the main slide 4 and the lifting seat 51 is significantly increased, and the self-locking characteristic of the trapezoidal cross-section effectively resists the lateral moment generated by the eccentric load, ensuring the accuracy of the vertical movement of the lifting seat 51.

[0102] In a preferred embodiment, refer to Figure 4 , 10, a support shaft 41 is provided on the main slide table 4; the first transmission unit 7 includes: a third connecting rod 71, a fourth connecting rod 72, and a fifth connecting rod 73. The lower end of the third connecting rod 71 is rotatably connected to the eccentric journal of the main crankshaft 11; the middle of the fourth connecting rod 72 is rotatably connected to the machine body 1, one end of which is hinged to the upper end of the third connecting rod 71, and the other end is provided with a counterweight 721; one end of the fifth connecting rod 73 is hinged to the support shaft 41, and the other end is hinged to the upper end of the fifth connecting rod 73, for pushing the main slide table 4 to reciprocate. The third connecting rod 71, the fourth connecting rod 72, and the fifth connecting rod 73 form a toggle structure. When the third connecting rod 71 drives the fifth connecting rod 73 to swing upward, the main slide table 4 is in the forward state. At this time, the forward speed of the main slide table 4 decreases, and the thrust received gradually increases. When the hinge point of the fourth connecting rod 72 and the machine body 1, the hinge point of the fourth connecting rod 72 and the fifth connecting rod 73, and the support shaft 41 are approximately collinear, the toggle structure enters the "dead point" state. At this time, the thrust of the main slide table 4 reaches the peak value, and the punching die 561 and the fixed die 61 complete the stamping forming of the workpiece with the maximum pressure, realizing the effect of decelerating and increasing force. And during the forward movement of the main slide table 4, its speed gradually decreases to extend the time of the cooperation between the punching die 561 and the fixed die 61 for stamping, achieving the effect of pressure holding, thereby ensuring the stamping quality of the workpiece. In addition, by setting the counterweight 721, the inertial impact force generated during the high-speed movement of the toggle structure can be balanced, the vibration of the machine body 1 can be suppressed, and the running stability of the equipment can be improved. After the stamping is completed, the third connecting rod 71 drives the fifth connecting rod 73 to swing downward, and the main slide table 4 moves backward to drive the front ejection unit 9 to eject the workpiece in the punching die 561.

[0103] In the above, second ejector holes 562 are respectively formed in the two punching dies 561 on the punching die seat 56. A ejector pin 563 is slidably connected in the second ejector hole 562. The front ejection unit 9 ejects the workpiece stuck in the punching die 561 by pushing the ejector pin 563 forward.

[0104] In a preferred embodiment, refer to Figure 8 , 9, 10, the front outlet unit 9 includes: a substrate 91, an outlet slider 93, a front outlet rocker arm 94, an auxiliary spring 95, and a return spring 96; the substrate 91 is fixedly arranged on the machine body 1 and above the main slide table 4, and a cam strip 92 is provided at the bottom of the substrate 91; the outlet slider 93 is horizontally slidably connected to the main slide table 4; the front outlet rocker arm 94 is rotatably connected to the main slide table 4, the front outlet rocker arm 94 has a T-shaped structure, its front end extends to form an auxiliary section 941, the rear end extends to form a driving section 942 in contact and cooperation with the cam strip 92, and the bottom extends to form an ejecting section 943 in abutment with the outlet slider 93; the auxiliary spring 95 is arranged between the auxiliary section 941 and the main slide table 4; the return spring 96 is arranged between the driving section 942 and the main slide table 4. During the retraction process of the main slide table 4, the driving section 942 triggers the front outlet rocker arm 94 to swing downward around the rotation center under the limitation of the cam strip 92, driving the ejecting section 943 to push the outlet slider 93 forward to achieve the initial ejection action. Since the cam strip 92 cannot precisely control the swinging process of the front outlet rocker arm 94, the front outlet rocker arm 9 cannot completely eject workpieces of different lengths out of the punching die 561. Therefore, at the moment when the top of the front outlet rocker arm 94 is reached, the auxiliary spring 95 continuously applies an upward auxiliary thrust to the auxiliary section 941 to assist the front outlet rocker arm 94 to timely connect to the initial ejection action and continue to swing downward, ensuring that the ejecting section 943 continuously pushes the outlet slider 93 forward during the retraction process of the main slide table 4. Through the rigid constraint of the cam strip 92 and the adaptive compensation of the auxiliary spring 95, it is ensured that the workpiece is continuously pushed forward at the moment of triggering the ejection, ensuring the synchronization of the retraction action of the main slide table 4 and the ejection action of the front outlet rocker arm 94, and realizing the function of completely ejecting workpieces of different lengths out of the punching die 561.

[0105] During the stamping stage, the main slide table 4 is driven to move forward. After the outlet slider 93 is subjected to the reverse force of the workpiece entering the die, it moves backward. The ejector pin 563 pushes the outlet slider 93 to move backward, forcing the ejecting section 943 to drive the front outlet rocker arm 94 to swing upward. At this time, the return spring 96 applies an upward return thrust to the driving section 942, so that the contact state between the position of the driving section 942 and the cam strip 92 provides an accurate triggering reference for the ejection action of the next working cycle.

[0106] Specifically, refer to Figure 8, the end of the driving section 942 is in contact and cooperation with the cam bar 92 through the second roller 9422. The cam bar 92 includes a through arc surface 921 and a reset plane 922. When the main slide 4 moves backward, the second roller 9422 slides from the through arc surface 921 to the reset plane 922, driving the front through rocker 94 to swing downward. By using the curvature change of the through arc surface 921, the driving section 942 is forced to press down, driving the front through rocker 94 to swing downward around the rotation center. When the second roller 9422 slides out of the through arc surface 921, the auxiliary spring 95 exerts a continuous auxiliary thrust on the auxiliary section 941 of the front through rocker 94, and the front through rocker 94 continues to swing downward, so that the ejecting section 943 maintains the forward pushing stroke of the through slider 93, ensuring that the workpiece is not restricted by the trajectory of the cam bar 92 during the ejection process; when the main slide 4 moves forward, the through slider 93 moves backward due to the reaction force of the workpiece entering the mold, driving the front through rocker 94 to swing upward around the rotation center. Combined with the driving section 942 under the action of the return thrust of the return spring 96, the second roller 9422 on the driving section 942 slides along the reset plane 922 to the through arc surface 921 and remains in contact, avoiding the inability to generate the next ejection action in time.

[0107] Further, referring to Figure 8 , a second screw 9411 is screwed on the auxiliary section 941; a second installation cavity 43 corresponding to the position of the second screw 9411 is provided on the main slide 4. The auxiliary spring 95 is embedded in the second installation cavity 43, and the upper end abuts against the end of the second screw 9411. By providing the second installation cavity 43, the stable installation of the auxiliary spring 95 is realized; by screwing the second screw 9411, the compression amount of the auxiliary spring 95 can be changed, so as to accurately adjust the magnitude of the auxiliary thrust received by the auxiliary section 941, ensuring that at the moment when the driving section 942 is constrained by the cam bar 92 to drive the front through rocker 94 to swing downward, the auxiliary thrust applied by the auxiliary spring 95 can continue to drive the front through rocker 94 to swing downward, ensuring that the ejecting section 943 continuously pushes the through slider 93 forward.

[0108] Referring to Figure 10 , a third screw 9421 is screwed on the driving section 942. A first installation cavity 44 corresponding to the position of the third screw 9421 is provided on the main slide 4. The return spring 96 is embedded in the first installation cavity 44, and the upper end abuts against the end of the third screw 9421 to apply an upward return thrust to the driving section 942. Through the geometric constraint of the first installation cavity 44, the stability of the installation of the return spring 96 is ensured, effectively preventing the return spring 96 from being deflected or twisted during the reciprocating motion, so that the second roller 9422 on the driving section 942 remains in contact with the cam bar 92.

[0109] In the above, by screwing the third screw rod 9421, the depth of the screwing-in driving section 942 of the third screw rod 9421 can be controlled to change the compression amount of the return spring 96, so as to accurately adjust the magnitude of the return thrust force received by the driving section 942.

[0110] Furthermore, referring to Figure 8 , an adjustment groove 911 extending along the moving direction of the main sliding table 4 is provided on the substrate 91, and the cam bar 92 is slidably connected to the adjustment groove 911; a fifth adjustment screw 912 is rotatably connected to the substrate 91, and the fifth adjustment screw 912 is screwed to the end of the cam bar 92; by rotating the fifth adjustment screw 912 to change its screwing-in amount, the cam bar 92 can be driven to move along the adjustment groove 911, so as to adjust the horizontal position of the passing-out arc surface 921 relative to the main sliding table 4, and accurately control the triggering timing of the ejecting action of the front passing-out rocker arm 94 when the main sliding table 4 retracts. A plurality of set screws 913 are provided on the substrate 91, and the set screws 913 lock the cam bar 92 on the substrate 91.

[0111] Furthermore, referring to Figure 9 , 10 , a hemispherical protrusion 9431 is provided at one end of the ejecting section 943 facing the passing-out slider 93; the passing-out slider 93 extends in the vertical direction. Specifically, in the vertical projection plane, both of the two ejector pins 563 in the same die holder 56 are within the projection range of the passing-out slider 93; a point contact fit is formed between the side wall of the passing-out slider 93 and the protrusion 9431. During the ejecting process, the hemispherical protrusion 9431 is in rolling contact with the side wall of the passing-out slider 93, reducing the sliding friction during the ejecting process to push the passing-out slider 93 forward. In the process of stamping the workpiece at the same station twice, when the passing-out slider 93 is driven by the ejecting section 943 to move forward, the passing-out slider 93 acts on the ends of the two ejector pins 563 synchronously, ensuring that the workpiece located in any die 561 is ejected and demolded. The integrated structure of a single slider driving two ejector pins 563 reduces the structural complexity.

[0112] In this embodiment, two fixed dies 61 are provided on the main die box 6, two die holders 56 corresponding to the positioning positions are provided on the lifting seat 51, and each die holder 56 includes two dies 561. The material clamping unit 8 clamps the bar stock to two stamping stations to realize the two-die four-stamping processing technology of the workpiece.

[0113] In a preferred embodiment, referring to Figures 11 - 16, the material clamping unit 8 includes: a clamping table 81, a sliding seat 82, a second transmission unit 83, a left clamping jaw assembly 84, a right clamping jaw assembly 85, a tension spring 86, and a clamping release mechanism 87; the clamping table 81 is fixedly arranged on the machine body 1; the sliding seat 82 is slidably connected to the clamping table 81; the second transmission unit 83 is arranged on the machine body 1, and the main crankshaft 11 drives the sliding seat 82 to reciprocate through the second transmission unit 83; the left clamping jaw assembly 84 includes a first rotating shaft 841, a first clamping arm 842, a common shaft 843, a second clamping arm 844, and a first adjusting column 845. The first rotating shaft 841 is rotatably connected to the sliding seat 82 and its end is connected to the first clamping arm 842. The common shaft 843 is arranged on the clamping table 81 and is rotatably connected to the second clamping arm 844. A first slotted hole 8421 is formed in the first clamping arm 842. One end of the first adjusting column 845 is rotatably connected to the second clamping arm 844, and the other end is slidably connected to the first slotted hole 8421. The first clamping arm 842 and the second clamping arm 844 cooperate to clamp the bar stock; the right clamping jaw assembly 85 includes a second rotating shaft 851, a third clamping arm 852, a fourth clamping arm 853, and a second adjusting column 854. The second rotating shaft 851 is rotatably connected to the sliding seat 82 and its end is connected to the third clamping arm 852. The fourth clamping arm 853 is rotatably connected to the common shaft 843. A second slotted hole 8531 is formed in the fourth clamping arm 853. One end of the second adjusting column 854 is rotatably connected to the third clamping arm 852, and the other end is slidably connected to the second slotted hole 8531. The third clamping arm 852 and the fourth clamping arm 853 cooperate to clamp the bar stock; the tension spring 86 is arranged between the first clamping arm 842 and the third clamping arm 852; the clamping release mechanism 87 is arranged on the clamping table 81 and is used to drive the first rotating shaft 841 and the second rotating shaft 851 to rotate. Under the action of the tension spring 86, the left clamping jaw assembly 84 and the right clamping jaw assembly 85 always maintain the state of clamping the workpiece until the clamping release mechanism 87 drives the first rotating shaft 841 and the second rotating shaft 851 to rotate, forcing the left clamping jaw assembly 84 and the right clamping jaw assembly 85 to open. The left clamping jaw assembly 84 and the right clamping jaw assembly 85 are connected to the same common shaft 843, effectively reducing the distance between the left clamping jaw assembly 84 and the right clamping jaw assembly 85, that is, reducing the distance between the two die holders 56, making the structural layout more compact.

[0114] During the clamping stage, the second transmission unit 83 drives the sliding seat 82 to move rightward. The first clamping arm 842 and the second clamping arm 844 cooperate to clamp the workpiece. At the same time, the third clamping arm 852 and the fourth clamping arm 853 cooperate to clamp the workpiece. And as the sliding seat 82 moves rightward, the left clamping jaw assembly 84 moves the workpiece from the material cutting station of the cold heading machine to the first stamping station, and the right clamping jaw assembly 85 moves the bar stock from the first stamping station of the cold heading machine to the second stamping station.

[0115] During the release phase, the clamping mechanism 87 drives the first rotating shaft 841 and the second rotating shaft 851 to rotate. The first rotating shaft 841 drives the first clamping arm 842 to swing upward around the axis of the first rotating shaft 841. The first adjusting column 845 moves accordingly and its end slides along the first waist-shaped hole 8421, so as to drive the second clamping arm 844 to swing upward around the axis of the common shaft 843. The angle between the first clamping arm 842 and the second clamping arm 844 increases, and the left clamping jaw assembly 84 releases the workpiece. During this process, the second rotating shaft 851 drives the third clamping arm 852 to swing upward around the axis of the second rotating shaft 851. The second adjusting column 854 moves accordingly and its end slides along the second waist-shaped hole 8531, so as to drive the fourth clamping arm 853 to swing upward around the common shaft 843. The angle between the third clamping arm 852 and the fourth clamping arm 853 increases, and the right clamping jaw assembly 85 releases the workpiece. By controlling the first rotating shaft 841 and the second rotating shaft 851, the opening angles of the two clamping jaw assemblies are synchronously enlarged. During this process, the end of the clamping arm is lifted to a height above the top of the workpiece with the maximum processing size, so that when the slide seat 82 retracts, it can directly cross the workpiece and return to the previous station without additional lifting action.

[0116] Further, the distance between the axis of the first rotating shaft 841 and the clamping center of the first clamping arm 842 and the second clamping arm 844 is greater than the distance between the axis of the common shaft 843 and the clamping center of the first clamping arm 842 and the second clamping arm 844; the distance between the axis of the second rotating shaft 851 and the clamping center of the third clamping arm 852 and the fourth clamping arm 853 is greater than the distance between the axis of the common shaft 843 and the clamping center of the third clamping arm 852 and the fourth clamping arm 853. Among them, the clamping centers of the first clamping arm 842 and the second clamping arm 844, and the clamping centers of the third clamping arm 852 and the fourth clamping arm 853 are respectively the centers of the corresponding fixed die 61. With the asymmetric design of the distance between the rotation center and the clamping center, the first clamping arm 842 and the second clamping arm 844, and the third clamping arm 852 and the fourth clamping arm 853 can generate a larger swing angle during the opening and closing process, thus significantly increasing the lifting height of the end of the clamping arm. Through the above settings, the limit height when the clamping jaw assembly opens has a positive correlation with the maximum processing size of the workpiece, directly expanding the maximum processing size of the workpieces allowed by the cold heading machine.

[0117] In the above, refer to Figure 11 , the second transmission unit 83 includes: a transmission cross shaft 831 rotatably connected to the machine body 1, a clamping table cam 832 fixed on the transmission cross shaft 831, and a clamping table rocker arm 833 rotatably connected to the machine body 1. The transmission cross shaft 831 is connected to the main transmission shaft 12 through a bevel gear assembly. One end of the clamping table rocker arm 833 is in contact connection with the clamping table cam 832, and the other end is connected to the slide seat 82 through a clamping table connecting rod 834. The main transmission shaft 12 drives the transmission cross shaft 831 to rotate, and the clamping table cam 832 drives the clamping table rocker arm 833 to swing reciprocally, so that the clamping table connecting rod 834 drives the slide seat 82 to move reciprocally.

[0118] Further, referring to Figure 13 and 14 , the clamping release mechanism 87 includes: a clamping release shaft 871, a third transmission unit 874, a first lever assembly 875, a first lever assembly 875, and a second lever assembly 876. The clamping release shaft 871 is rotatably connected to the clamping table 81 and is provided with a first cam assembly 872 and a second cam assembly 873. The third transmission unit 874 is disposed on the machine body 1, and the second transmission unit 83 drives the clamping release shaft 871 to rotate through the third transmission unit 874. The first lever assembly 875 is rotatably connected to the clamping table 81, one end thereof is in contact and cooperation with the first cam assembly 872, and the other end is provided with a first pressing strip 8751. A first pressing arm 8411 is provided on the first rotating shaft 841, and the first pressing strip 8751 is used to press down the first pressing arm 8411 to drive the first rotating shaft 841 to rotate. The second lever assembly 876 is rotatably connected to the clamping table 81, one end thereof is in contact and cooperation with the second cam assembly 873, and the other end is provided with a second pressing strip 8761. A second pressing arm 8511 is provided on the second rotating shaft 851, and the second pressing strip 8761 is used to press down the second pressing arm 8511 to drive the second rotating shaft 851 to rotate. Working process: The third transmission unit 874 drives the clamping release shaft 871 to rotate, driving the first cam assembly 872 and the second cam assembly 873 to rotate synchronously. Since the first cam assembly 872 is in contact and cooperation with the end of the first lever assembly 875 to drive the first lever assembly 875 to swing, when the first pressing strip 8751 presses down the first pressing arm 8411 along with the first lever assembly 875, the first pressing arm 8411 drives the first rotating shaft 841 to rotate around its axis, and the first clamping arm 842 swings upward, and the first clamping arm 842 and the second clamping arm 844 release the workpiece.

[0119] Similarly, the second cam assembly 873 is in contact and cooperation with the end of the second lever assembly 876 to drive the second lever assembly 876 to swing. When the second pressing strip 8761 presses down the second pressing arm 8511 along with the second lever assembly 876, the second pressing arm 8511 drives the second rotating shaft 851 to rotate around its axis, and the third clamping arm 852 swings upward, and the third clamping arm 852 and the fourth clamping arm 853 release the workpiece. Through the above settings, the function of synchronously releasing the workpiece by the left clamping jaw assembly 84 and the right clamping jaw assembly 85 is achieved.

[0120] Specifically, the first cam assembly 872 includes two independently adjustable clamping cams 8721. Each clamping cam 8721 includes a third arc surface and a fourth arc surface, and the radius of the third arc surface is larger than that of the fourth arc surface. When the first lever assembly 875 contacts the third arc surface, the left jaw assembly 84 is in a state of releasing the workpiece. Conversely, when the first lever assembly 875 contacts the fourth arc surface, the left jaw assembly 84 is in a state of clamping the workpiece. By adjusting the relative positions of the two clamping cams 8721, the starting moment when the left jaw assembly 84 releases the workpiece can be set to be triggered by the contact of the third arc surface of one clamping cam 8721, and the ending moment can be controlled by the separation from the third arc surface of the other clamping cam 8721, so as to accurately match the action timing of the stamping station of the cold heading machine, dynamically adjust the opening and closing rhythm of the jaw assembly, avoid mechanical interference and improve the processing stability.

[0121] Among the above, the structure of the second cam assembly 873 is similar to that of the first cam assembly 872. For details, refer to the above-mentioned first cam assembly 872.

[0122] Among the above, the third transmission unit 874 includes a transmission vertical shaft rotatably connected to the bed 1. The two ends of the transmission vertical shaft are respectively connected to the transmission horizontal shaft 831 and the clamping shaft 871 through bevel gear assemblies to drive the clamping shaft 871 to rotate.

[0123] Further, referring to Figure 14 , a first straight rod 811 is provided on the clamping table 81. The first lever assembly 875 includes a push block 8752 and a pressure block 8753 rotatably connected to the first straight rod 811. One end of the push block 8752 is in sliding contact with the cam surface of the first cam assembly 872 through a third roller 8754, and the other end is used to press down the pressure block 8753. Specifically, a screw is screwed at the other end of the push block 8752, and the end of the screw acts on the pressure block 8753. A first pressing strip 8751 is provided at the end of the pressure block 8753. When the clamping shaft 871 drives the first cam assembly 872 to rotate, the third roller 8754 slides along the third arc surface, pushing the push block 8752 to swing towards the pressure block 8753. At this time, the screw presses down the pressure block 8753, and it swings downward around the first straight rod 811. The first pressing strip 8751 at the end of the pressure block 8753 presses down the first pressing arm 8411 accordingly, driving the left jaw assembly 84 to open. When the third roller 8754 transitions to the fourth arc surface, it drives the push block 8752 to swing in the reverse direction, and the left jaw assembly 84 returns to the closed state under the action of the tension spring 86.

[0124] Specifically, the clamping table 81 further includes a second straight rod 812. The second straight rod 812 is located below the pressing block 8753, and a return spring 813 is provided in the middle of the bottom of the pressing block 8753. The return spring 813 always exerts an upward thrust on the pressing block 8753 to ensure that the screw abuts against the pressing block 8753, and at the same time forces the third roller 8754 to closely adhere to the wheel surface of the clamping cam 8721.

[0125] In the above, the structure of the second lever assembly 876 is similar to that of the first lever assembly 875, and reference may be specifically made to the above-mentioned first lever assembly 875.

[0126] Preferably, a rotatable fourth roller 8412 is provided on the first pressing arm 8411, and the fourth roller 8412 slides along the first pressing strip 8751; a rotatable fifth roller 8512 is provided on the second pressing arm 8511, and the fifth roller 8512 slides along the second pressing strip 8761. When the slide seat 82 drives the jaw assembly to translate, the fourth roller 8412 rolls along the surface of the first pressing strip 8751, and the fifth roller 8512 rolls along the surface of the second pressing strip 8761. The continuous contact and restraint effect between the roller and the pressing strip ensure that the opening angle or clamping state of the jaw assembly is stably maintained.

[0127] In the above embodiment, refer to Figure 13 、 14 On the clamping table 81, there are two parallel guide rods 814 located on the same horizontal plane. The cross-section of the slide seat 82 is in an L-shaped structure, and the horizontal section of the slide seat 82 is slidably connected to the two guide rods 814. Through the above settings, the rotation connection points of the first rotating shaft 841 and the second rotating shaft 851 with the slide seat 82 are located directly above the two guide rods 814, obtaining good support. At the same time, the first pressing arm 8411 and the second pressing arm 8511 are arranged in the space between the two guide rods 814 to ensure that when the first pressing arm 8411 and the second pressing arm 8511 are pressed and swung downward, they will not generate interfering prying forces on the first rotating shaft 841 and the second rotating shaft 851, significantly improving the stability of the rotating shaft installation and the reliability of the jaw assembly for clamping workpieces.

[0128] In a preferred embodiment, refer to Figure 16, the first adjusting column 845 includes a first portion 8451, a second portion 8452, and a third portion 8453. The first portion 8451 is rotatably connected to the second clamping arm 844. The third portion 8453 is disposed in the first elongated hole 8421. The first portion 8451 and the third portion 8453 are not coaxially arranged, and the second portion 8452 is coaxially arranged with the third portion 8453. Among them, the second portion 8452 serves to connect the first portion 8451 and the third portion 8453. The shaft diameter of the second portion 8452 is smaller than that of the third portion 8453, and the shaft diameter of the third portion 8453 is smaller than that of the first portion 8451, which facilitates the installation of the first adjusting column 845 to pass through the second clamping arm 844 and the first clamping arm 842 in sequence. During adjustment, by rotating the first portion 8451, the third portion 8453 slides along an eccentric trajectory in the first elongated hole 8421, forcing the first clamping arm 842 and the second clamping arm 844 to generate relative displacement. When the left clamping jaw assembly 84 is in the closed state of clamping the workpiece, by rotating the first adjusting column 845, the end positions of the first clamping arm 842 and the second clamping arm 844 are finely adjusted to correct the deviation between the axis of the workpiece and the center of the fixed mold 61, ensuring the forming accuracy.

[0129] Similarly, the structure of the second adjusting column 854 is similar to that of the first adjusting column 845. Specifically, reference can be made to the first adjusting column 845 and the connection structure between the first adjusting column 845 and the left clamping jaw assembly 84. When the right clamping jaw assembly 85 is in the closed state of clamping the workpiece, by rotating the second adjusting column 854, the deviation between the axis of the workpiece and the center of the fixed mold 61 can be corrected, ensuring the forming accuracy.

[0130] In a preferred embodiment, refer to Figure 11 , 17, the feeding unit 2 includes: a mounting base 21, a feeding mechanism 22, a feeding rocker arm 23, a fourth transmission unit 25, a ratchet 26, and a feeding cylinder 27. The mounting base 21 is fixedly provided on the bed body 1; the feeding mechanism 22 is provided on the mounting base 21, and a feeding shaft 221 is provided at its input end; the feeding rocker arm 23 is rotatably connected to the end of the feeding shaft 221, and a feeding pawl 24 is rotatably connected to one end of the feeding rocker arm 23; the fourth transmission unit 25 is provided on the bed body 1, and the second transmission unit 83 drives the feeding rocker arm 23 to swing reciprocally through the fourth transmission unit 25; the ratchet 26 is fixedly provided on the feeding shaft 221; the feeding cylinder 27 is fixedly provided at one end of the feeding rocker arm 23, and its extending rod is connected to the feeding pawl 24 to control the contact or separation between the feeding pawl 24 and the ratchet 26. During use, when the extending rod of the feeding cylinder 27 retracts, it drives the feeding pawl 24 to contact the ratchet teeth of the ratchet 26, the fourth transmission unit 25 drives the feeding rocker arm 23 to swing upward, the ratchet 26 drives the feeding shaft 221 to rotate, and the feeding mechanism 22 conveys the wire towards the bed body 1; the fourth transmission unit 25 drives the feeding rocker arm 23 to swing downward, and at the same time the extending rod of the feeding cylinder 27 extends to drive the feeding pawl 24 away from the ratchet 26, the ratchet 26 and the feeding shaft 221 are in a static state, and the feeding mechanism 22 stops conveying the wire. The intermittent feeding of the wire to the bed body 1 by the feeding mechanism 22 is realized through the reciprocating swing of the feeding rocker arm 23.

[0131] In the above, refer to Figure 17 , the feeding mechanism 22 includes two driven components 222 and a transmission gear 223 rotatably connected to the mounting base 21. Each driven component 222 includes a lower gear 2221 and a lower feeding wheel 2222 coaxially connected, and an upper gear 2223 and an upper feeding wheel 2224 coaxially connected. The ratchet 26 is meshed with the lower gear 2221 of one of the driven components 222 through the feeding shaft 221. The two lower gears 2221 are connected by the transmission gear 223, and the lower feeding wheel 2222 and the upper feeding wheel 2224 cooperate to convey the wire forward. When the feeding pawl 24 contacts the ratchet 26 and the ratchet 26 drives the feeding shaft 221 to rotate, the transmission gear 223 drives the two lower gears 2221 to rotate synchronously. The lower gear 2221 is meshed with the upper gear 2223, so that the lower feeding wheel 2222 and the upper feeding wheel 2224 rotate synchronously and in opposite directions and convey the wire forward; conversely, when the feeding pawl 24 is away from the ratchet 26 and the feeding shaft 221 is in a static state, the lower feeding wheel 2222 and the upper feeding wheel 2224 stop conveying the wire to realize the function of intermittent wire conveying.

[0132] Further, the fourth transmission unit 25 includes: a rear outlet cross shaft 251, an adjustment disk 252, and a feeding connecting rod 253. The rear outlet cross shaft 251 is rotatably connected to the machine body 1, and the second transmission unit 83 drives the rear outlet cross shaft 251 to rotate. Specifically, the transmission cross shaft 831 drives the rear outlet cross shaft 251 to rotate through a bevel gear transmission assembly. The adjustment disk 252 is fixedly arranged at the end of the rear outlet cross shaft 251. One end of the feeding connecting rod 253 is eccentrically hinged to the adjustment disk 252, and the other end is hinged to the other end of the feeding swing arm 23. The rear outlet cross shaft 251 drives the adjustment disk 252 to rotate, driving one end of the feeding connecting rod 253 to rotate around the axis of the rear outlet cross shaft 251, so as to drive the feeding swing arm 23 to swing reciprocally.

[0133] Specifically, the adjustment disk 252 is provided with an adjustment chute 2521 extending radially along its center. A feeding slider 2522 is slidably connected in the adjustment chute 2521. One end of the feeding connecting rod 253 is rotatably connected to the feeding slider 2522. By adjusting the position of the feeding slider 2522 in the adjustment chute 2521, the distance between the feeding connecting rod 253 and the center of the adjustment disk 252 is adjusted, that is, the eccentric hinged position of the feeding connecting rod 253 and the adjustment disk 252 is adjusted, so as to control the swing amplitude of the feeding swing arm 23 and realize the control of the length of the conveyed wire.

[0134] It should be noted that the cutting unit 3 is linked and cooperated with the intermittent wire feeding action of the feeding mechanism 22, and performs cutting after the wire reaches the preset conveying length, cutting the continuous wire into fixed-length bar stocks. The cutting unit 3 adopts the prior art solution, and its core structure and working principle can refer to the patent document with the publication number of CN220196260U, which specifically discloses a cutting device for a cold heading machine.

[0135] In a preferred embodiment, referring to Figure 2 、 4 also includes a rear outlet unit 10. There is a first ejector hole 62 coaxial with the fixed die 61 in the main die box 6. The rear outlet unit 10 includes: a rear outlet cam 101, a rear outlet ejector rod 102, and a rear outlet swing arm 103. The rear outlet cam 101 is arranged on the rear outlet cross shaft 251. The rear outlet ejector rod 102 is slidably arranged on the machine body 1, and one end extends into the first ejector hole 62. The rear outlet swing arm 103 is rotatably connected to the machine body 1, one end is in contact and cooperation with the rear outlet cam 101, and the other end drives the rear outlet ejector rod 102 to move. When the workpiece is completed with two stamping operations, during the retraction process of the main slide table 4, the rear outlet cam 101 drives the rear outlet swing arm 103 to swing towards the main die box 6, so as to drive the rear outlet ejector rod 102 to slide along the first ejector hole 62 and eject the workpiece from the fixed die 61. In the next stamping operation, the rear outlet ejector rod 102 is pushed back to its original position by the workpiece.

[0136] It is understood that those of ordinary skill in the art can make equivalent substitutions or changes based on the technical solution of the present invention and its inventive concept, and all such changes or substitutions shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A two-mode four-stroke cold heading machine, characterized in that, Comprising: A bed body (1), rotatably connected with a main crankshaft (11) and a main transmission shaft (12) which are in transmission connection with each other. The end of the main transmission shaft (12) extends to the outside of the bed body (1) and is provided with a lifting cam (13); A swing shaft (14) is also rotatably connected to the bed body (1), and the end of the swing shaft (14) extends to the outside of the bed body (1); A feeding unit (2), arranged on the bed body (1) for conveying wire materials; A cutting unit (3), arranged on the bed body (1) for cutting the wire materials conveyed by the feeding unit (2) into bar materials; A main slide table (4), horizontally slidably connected with the bed body (1); A die lifting unit (5), including a lifting seat (51), a swing mechanism (52), a first connecting rod (53), a second connecting rod (54) and a limiting mechanism (55). The lifting seat (51) is vertically slidably connected with the main slide table (4), and the lifting seat (51) is provided with at least one die holder (56); The swing mechanism (52) connects the lifting cam (13) and the end of the swing shaft (14); One end of the first connecting rod (53) is fixedly arranged on the swing shaft (14), one end of the second connecting rod (54) is hinged to the other end of the first connecting rod (53), and the other end is hinged to the bottom of the lifting seat (51); The limiting mechanism (55) is used to limit the lifting range of the lifting seat (51); Wherein the lifting cam (13) drives the swing mechanism (52) to reciprocally swing around the axis of the swing shaft (14), drives the swing shaft (14) to perform a reciprocating rotation at a fixed angle, and enables the first connecting rod (53) and the second connecting rod (54) to be linked to drive the lifting seat (51) to perform a lifting motion; A main die box (6), fixedly arranged on the bed body (1) and corresponding to the main slide table (4), and at least one fixed die (61) is arranged on the main die box (6); A first transmission unit (7), arranged on the bed body (1) and driven by the main crankshaft (11), for driving the main slide table (4) to reciprocally move; A material clamping unit (8), arranged on the bed body (1) for clamping the bar materials to different work positions.

2. The two-mode four-stroke cold heading machine according to claim 1, wherein The swing mechanism (52) includes a swing seat (521) fixedly arranged at the end of the swing shaft (14), an upper swing arm (522) and a lower swing arm (523) respectively hinged on both sides of the swing seat (521), and a buffer spring (524) connecting the ends of the upper swing arm (522) and the lower swing arm (523). The lifting cam (13) is in contact and cooperation with the upper swing arm (522) and the lower swing arm (523) respectively.

3. The two-mode four-stroke cold heading machine according to claim 2, characterized in that, An extension section (5211) located between the upper swing arm (522) and the lower swing arm (523) is arranged on the swing seat (521). A first adjusting screw (525) is screwed on the upper swing arm (522), a second adjusting screw (526) is screwed on the lower swing arm (523), and the first adjusting screw (525) and the second adjusting screw (526) respectively abut against the extension section (5211) to control the swing amplitude of the swing seat (521).

4. The two-mode four-stroke cold heading machine according to claim 2, characterized in that, The limiting mechanism (55) includes a gantry (511) fixedly provided at the top of the lifting seat (51), a third adjusting screw (551) screwed to the top of the gantry (511), a fourth adjusting screw (552) screwed to the top of the lifting seat (51), and a bumper (553) fixedly provided at the top of the main slide (4) and located between the third adjusting screw (551) and the fourth adjusting screw (552).

5. The two-mode four-stroke cold heading machine according to claim 1, wherein, A support shaft (41) is provided on the main slide (4); the first transmission unit (7) includes: A third connecting rod (71), the lower end of which is rotatably connected to the eccentric journal of the main crankshaft (11); A fourth connecting rod (72), the middle part of which is rotatably connected to the bed body (1), one end is hinged to the upper end of the third connecting rod (71), and the other end is provided with a counterweight (721); A fifth connecting rod (73), one end of which is hinged to the support shaft (41), and the other end is hinged to the upper end of the third connecting rod (71) for pushing the main slide (4) to reciprocate.

6. The two-mode four-stroke cold heading machine according to claim 1, characterized in that, It further includes a front outlet unit (9), and the front outlet unit (9) includes: A base plate (91) fixedly provided on the bed body (1) and above the main slide (4), and a cam strip (92) is provided at the bottom of the base plate (91); An outlet slider (93) slidably connected to the main slide (4) horizontally; A front outlet rocker arm (94) rotatably connected to the main slide (4), the front outlet rocker arm (94) has a T-shaped structure, the front end thereof extends to form an auxiliary section (941), the rear end extends to form a driving section (942) in contact and cooperation with the cam strip (92), and the bottom extends to form an ejecting section (943) abutting against the outlet slider (93); An auxiliary spring (95) is provided between the auxiliary section (941) and the main slide (4); A return spring (96) is provided between the driving section (942) and the main slide (4).

7. The two-mode four-stroke cold heading machine according to claim 1, characterized in that, The material clamping unit (8) includes: A clamping table (81) fixedly provided on the bed body (1); A sliding seat (82) slidably connected to the clamping table (81); A second transmission unit (83) provided on the bed body (1), and the main crankshaft (11) drives the sliding seat (82) to reciprocate through the second transmission unit (83); The left clamping jaw assembly (84) includes a first rotating shaft (841), a first clamping arm (842), a common shaft (843), a second clamping arm (844) and a first adjusting column (845). The first rotating shaft (841) is rotatably connected to the sliding seat (82) and the end is connected to the first clamping arm (842). The common shaft (843) is provided on the clamping table (81) and rotatably connected to the second clamping arm (844). A first waist-shaped hole (8421) is provided on the first clamping arm (842). One end of the first adjusting column (845) is rotatably connected to the second clamping arm (844), and the other end is slidably connected to the first waist-shaped hole (8421). The first clamping arm (842) and the second clamping arm (844) cooperate to clamp the bar stock; The right clamping jaw assembly (85) includes a second rotating shaft (851), a third clamping arm (852), a fourth clamping arm (853), and a second adjusting column (854). The second rotating shaft (851) is rotatably connected to the sliding seat (82) and its end is connected to the third clamping arm (852). The fourth clamping arm (853) is rotatably connected to the common shaft (843). A second waist-shaped hole (8531) is formed in the fourth clamping arm (853). One end of the second adjusting column (854) is rotatably connected to the third clamping arm (852), and the other end is slidably connected to the second waist-shaped hole (8531). The third clamping arm (852) and the fourth clamping arm (853) cooperate to clamp the bar stock. A tension spring (86) is arranged between the first clamping arm (842) and the third clamping arm (852). The unclamping mechanism (87) is arranged on the clamping table (81) and is used to drive the first rotating shaft (841) and the second rotating shaft (851) to rotate.

8. The two-mode four-stroke cold heading machine according to claim 7, characterized in that, The distance between the axis of the first rotating shaft (841) and the clamping center of the first clamping arm (842) and the second clamping arm (844) is greater than the distance between the axis of the common shaft (843) and the clamping center of the first clamping arm (842) and the second clamping arm (844). The distance between the axis of the second rotating shaft (851) and the clamping center of the third clamping arm (852) and the fourth clamping arm (853) is greater than the distance between the axis of the common shaft (843) and the clamping center of the third clamping arm (852) and the fourth clamping arm (853).

9. The two-mode four-stroke cold heading machine according to claim 7, characterized in that, The unclamping mechanism (87) includes: An unclamping shaft (871) is rotatably connected to the clamping table (81) and is provided with a first cam assembly (872) and a second cam assembly (873). A third transmission unit (874) is arranged on the machine body (1). The second transmission unit (83) drives the unclamping shaft (871) to rotate through the third transmission unit (874). A first lever assembly (875) is rotatably connected to the clamping table (81). One end of it is in contact and cooperation with the first cam assembly (872), and the other end is provided with a first pressing strip (8751). A first pressing arm (8411) is arranged on the first rotating shaft (841). The first pressing strip (8751) is used to press down the first pressing arm (8411) to drive the first rotating shaft (841) to rotate. A second lever assembly (876) is rotatably connected to the clamping table (81). One end of it is in contact and cooperation with the second cam assembly (873), and the other end is provided with a second pressing strip (8761). A second pressing arm (8511) is arranged on the second rotating shaft (851). The second pressing strip (8761) is used to press down the second pressing arm (8511) to drive the second rotating shaft (851) to rotate.

10. The two-mode four-stroke cold heading machine according to claim 1, characterized in that, The feeding unit (2) includes: A mounting seat (21) is fixedly arranged on the machine body (1). A feeding mechanism (22) is arranged on the mounting seat (21), and its input end is provided with a feeding shaft (221). A feeding swing arm (23) is rotatably connected to the end of the feeding shaft (221). One end of the feeding swing arm (23) is rotatably connected with a feeding ratchet pawl (24). The fourth transmission unit (25) is provided on the machine tool bed (1), and the second transmission unit (83) drives the feeding swing arm (23) to swing reciprocally through the fourth transmission unit (25); The ratchet wheel (26) is fixedly arranged on the feeding shaft (221); The feeding air cylinder (27) is fixedly arranged at one end of the feeding swing arm (23), and its extending rod is connected to the feeding ratchet pawl (24) to control the contact or separation between the feeding ratchet pawl (24) and the ratchet wheel (26).

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