Self-locking mechanism for a 2-on-1 cold header

Abstract

The utility model provides a self locking mechanism of one die two punch cold header, including clamping block, limit block and self locking subassembly, clamping block sliding installation is in first slide, and limit block fixed mounting is in second slide, self locking subassembly is configured as: before the upsetting of first punch or second punch, drives clamping block to slip to the above or below of limit block to the locking of second slide through self locking subassembly, after the upsetting of first punch or second punch, drives clamping block to slip and limit block to unlock second slide through self locking subassembly, the utility model discloses a fixed limit block on second slide, and the clamping block is set up in the sliding of first slide, and the cooperation self locking subassembly drive clamping block is accurate to slip to the above or below of limit block and is locked before stamping, has realized the rigid locking of second slide vertical direction, has prevented effectively the up and down shaking of second slide and its punch on it in the stamping process, has guaranteed the precision and stability of stamping forming, has improved the forming quality of workpiece significantly.

Description

Technical Field

[0001] This utility model relates to the field of cold forging technology for metal parts, and in particular to a self-locking mechanism for a one-die two-punch cold heading machine. Background Technology

[0002] Heading machines are a type of cold forging equipment, mainly used for forming the heads of screws. Their working principle involves straightening, feeding, cutting, and feeding the wire into the main die; a first forging stroke; and a second forging stroke to remove the formed blank. They can forge various metal materials, including ordinary steel, carbon steel, stainless steel, copper, aluminum, and alloy steel, and have a wide range of applications.

[0003] The current mainstream screw end forming process adopts a two-stage stamping forming method of "one die and two punches". This process is realized by a cold heading machine, and its key feature is that it is equipped with an automatic dual die head switching mechanism. After the first punch head completes the preliminary forming (such as pre-heading), the die head automatically switches, and the final ball end is precision forged by the second punch head.

[0004] For example, Chinese patent CN110877084A discloses an automatic cold heading machine for ball head processing. It uses a workpiece clamping fixture and opposing forging dies mounted on a frame. The forging die consists of a horizontally sliding die base and a vertically sliding die block. The die block integrates a primary forming die (die head one) and a secondary forming die (die head two), arranged along the vertical sliding direction. A drive mechanism one (such as a crankshaft-connecting rod) drives the die base in a horizontal reciprocating motion to perform the forging action. A drive mechanism two (such as a cam-connecting rod) drives the die block to slide vertically, achieving die head switching. When the die block descends to the lower dead center, die head one performs initial forging (such as forming a frustum) directly facing the workpiece; when it rises to the upper dead center, die head two performs final forging (forming a ball head) directly facing the workpiece. This solution significantly reduces the number of clamping operations, improving the efficiency and automation of ball head forming.

[0005] However, the two dies in this patent are not aligned and locked in the vertical sliding direction after switching, which causes the dies to easily vibrate in the vertical direction during stamping, seriously affecting the accuracy, stability and quality of the stamping process. Utility Model Content

[0006] This invention proposes a self-locking mechanism for a single-die two-punch cold heading machine, which solves the problem that in the prior art, the two die heads of a single-die two-punch cold heading machine are not locked after switching, which causes the die head to easily vibrate in the vertical direction during stamping, seriously affecting the accuracy, stability and quality of stamping and forming and the final product.

[0007] The technical solution of this utility model is implemented as follows:

[0008] This utility model provides a self-locking mechanism for a one-die two-punch cold heading machine. The cold heading machine includes a frame, a first slide, a second slide, a first driving component, and a second driving component. The first driving component drives the first slide to slide back and forth on a horizontal slide rail of the frame. The second driving component drives the second slide to slide up and down on a vertical slide rail at the front end of the first slide. The front end of the second slide is provided with a first punch and a second punch along a vertical direction. The self-locking mechanism includes a locking block, a limiting block, and a self-locking assembly. The locking block is slidably mounted on the first slide, and the limiting block is fixedly mounted on the second slide. The self-locking assembly is configured to: before the first punch or the second punch performs upsetting, drive the locking block to slide above or below the limiting block to lock the second slide; after the first punch or the second punch completes upsetting, drive the locking block to slide away from the limiting block to unlock the second slide.

[0009] Specifically, the self-locking assembly includes a limiting strip, a lever, and a reset element. The limiting strip is mounted on the frame. The lever is rotatably mounted on the first slide block via a vertical pin. A slot is provided on the side of the locking block, and the head end of the lever is embedded in the slot. The tail end of the lever engages with the limiting strip. The limiting strip and lever are configured such that: before the first or second punch performs upsetting, the tail end of the lever disengages from the limiting strip, and the reset element drives the lever to rotate, forcing the locking block to slide above or below the limiting block to lock the second slide block; after the first or second punch completes upsetting, the retraction of the first slide block forces the tail end of the lever to rotate to the inside of the limiting strip and slide against it, while the head end of the lever rotates, forcing the locking block to slide away from the limiting block to unlock the second slide block.

[0010] Preferably, a roller is rotatably mounted at the tail end of the lever via a U-shaped frame.

[0011] Preferably, the end of the limiting strip has a rounded corner structure.

[0012] Furthermore, a base is fixedly installed on the first slide block, the bottom surface of the base is provided with a sliding cavity for the block to slide, and the side surface of the base is provided with a clearance groove for the lever to pass through and rotate, the clearance groove being in communication with the sliding cavity.

[0013] Furthermore, the bottom end of the pin is fixedly connected to the slide, and the top end of the pin is fixedly connected to the top surface of the base through a connecting plate.

[0014] Preferably, the reset element includes a stop block and a push rod, the push rod is slidably embedded in the slide cavity, and the front end of the push rod abuts against the locking block; a compression spring is provided between the stop block and the push rod to force the locking block to slide and lock the second slide seat; blind holes are provided at the tail end of the push rod and the end face of the stop block, and the two ends of the compression spring are respectively embedded in the blind holes of the stop block and the push rod.

[0015] Optionally, the reset element is a torsion spring, which is sleeved outside the pin and is used to force the lever to rotate in the direction that drives the locking block to slide and lock the second slide.

[0016] Preferably, the top surface of the front end of the card block is a downward slope, and the bottom surface is an upward slope, and the top and bottom surfaces of the limiting block are slopes that match the bottom and top surfaces of the front end of the card block.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] (1) This utility model achieves rigid locking of the second slide in the vertical direction by fixing a limiting block on the second slide and sliding a locking block on the first slide, and cooperating with the self-locking component to drive the locking block to slide precisely above or below the limiting block before stamping. This effectively prevents the second slide and its upper punch from shaking up and down during the stamping process, fundamentally ensuring the accuracy and stability of stamping and significantly improving the forming quality of workpieces such as ball pins.

[0019] (2) This utility model utilizes a fixed limiting strip installed on the frame and a rotating lever on the first slide to work together. Before stamping, the tail end of the lever disengages from the limiting strip and rotates under the action of the reset element, driving the head end to move and lock the second slide by sliding the locking block. After stamping, the first slide retracts, causing the tail end of the lever to rotate to abut against the inside of the limiting strip, and the head end of the lever rotates accordingly, forcing the locking block to slide and unlock. This design realizes the automatic linkage between the self-locking and unlocking actions and the forward / reverse actions of the cold heading machine slide, without the need for an additional drive source, with a simple and reliable structure and precise action timing;

[0020] (3) This utility model designs the top and bottom surfaces of the front end of the card block as downward slopes and upward slopes respectively, and the corresponding contact surface of the limiting block is designed as a matching slope. This design can avoid collision between the end face of the card block and the end face of the limiting block, and also avoid friction between the card block and the limiting block during the sliding process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of a self-locking mechanism for a single-die two-punch cold heading machine according to the present invention.

[0023] Figure 2 This is a top view of a self-locking mechanism for a single-die two-punch cold heading machine according to the present invention;

[0024] Figure 3 This is a schematic diagram of the assembly structure of the self-locking component and the card block in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the self-locking mechanism of the second punch in the locked state before punching in this embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the self-locking mechanism in the unlocked state after the second punch is pressed in this embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the self-locking mechanism of the first punch in the locked state before punching in this embodiment of the present invention;

[0028] In the diagram: 1. Frame; 2. First slide; 3. Second slide; 4. First drive component; 5. First punch; 6. Second punch; 7. Locking block; 8. Limiting block; 9. Limiting strip; 10. Lever; 11. Reset element; 12. Pin; 13. Slot; 14. Roller; 15. Base; 16. Slide cavity; 17. Clearance groove; 18. Connecting plate; 19. Stop; 20. Push rod. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Reference Figures 1 to 6This utility model provides a self-locking mechanism for a one-die two-punch cold heading machine. The cold heading machine includes a frame 1, a first slide 2, a second slide 3, a first driving component 4, and a second driving component (not shown in the figure). The first driving component 4 drives the first slide 2 to slide back and forth on a horizontal slide rail of the frame 1. The second driving component drives the second slide 3 to slide up and down on a vertical slide rail at the front end of the first slide 2. The front end of the second slide 3 is provided with a first punch 5 and a second punch 6 along a vertical direction. The self-locking mechanism includes a locking block 7, a limiting block 8, and a self-locking assembly. The locking block 7 is slidably mounted on the first slide block 2, and the limiting block 8 is fixedly mounted on the second slide block 3. The self-locking assembly is configured to: before the first punch 5 or the second punch 6 performs upsetting, drive the locking block 7 to slide above or below the limiting block 8 to lock the second slide block 3; after the first punch 5 or the second punch 6 completes upsetting, drive the locking block 7 to slide and disengage from the limiting block 8 to unlock the second slide block 3.

[0031] This invention achieves rigid locking of the second slide block 3 in the vertical direction by fixing a limiting block 8 on the second slide block 3 and sliding a locking block 7 on the first slide block 2. The locking block 7 is driven by a self-locking component to precisely slide above or below the limiting block 8 before stamping. This effectively prevents the second slide block 3 and its punch from shaking up and down during the stamping process, fundamentally ensuring the accuracy and stability of stamping and significantly improving the forming quality of workpieces such as ball pins.

[0032] Specifically, such as Figures 1 to 3The self-locking assembly includes a limiting strip 9, a lever 10, and a reset element 11. The limiting strip 9 is mounted on the frame 1. The lever 10 is rotatably mounted on the first slide block 2 via a vertical pin 12. The side of the locking block 7 has a locking groove 13, and the head end of the lever 10 is embedded in the locking groove 13. The tail end of the lever 10 cooperates with the limiting strip 9. The limiting strip 9 and the lever 10 are configured such that: before the first punch 5 or the second punch 6 performs upsetting, the tail end of the lever 10 disengages from the limiting strip 9, and the reset element 11 drives the lever 10 to rotate, forcing the locking block 7 to slide above or below the limiting block 8 to lock the second slide block 3; after the first punch 5 or the second punch 6 completes upsetting, the retraction of the first slide block 2 forces the tail end of the lever 10 to rotate to the inside of the limiting strip 9 and slide against the limiting strip 9, and the head end of the lever 10 rotates, forcing the locking block 7 to slide away from the limiting block 8 to unlock the second slide block 3. By cleverly cooperating with the fixed limiting strip 9 mounted on the frame 1 and the rotating lever 10 on the first slide 2, before stamping, the tail end of the lever 10 disengages from the limiting strip 9 and rotates under the action of the reset element 11, driving the head end to move and lock the locking block 7 to the second slide 3. After stamping, the first slide 2 retracts, causing the tail end of the lever 10 to rotate to abut against the inside of the limiting strip 9, and the head end of the lever 10 rotates accordingly, forcing the locking block 7 to slide and unlock. This design achieves automatic linkage between the self-locking and unlocking actions and the forward / reverse movement of the cold heading machine slide, without the need for an additional drive source, with a simple and reliable structure and precise action timing.

[0033] Preferably, such as Figure 3-6 As shown, the tail end of the lever 10 is rotatably mounted with a roller 14 via a U-shaped frame. On the one hand, this converts sliding friction into rolling friction, reducing the friction between the tail end of the lever 10 and the limiting strip 9. On the other hand, the roller 14 and the end of the limiting strip 9 can cooperate better, so that when the first slide block 2 retracts, the tail end of the lever 10 can smoothly transition from the end of the limiting strip 9 to the inside of the limiting strip 9, avoiding jamming.

[0034] Preferably, such as Figure 4-6 As shown, the end of the limiting strip 9 is provided with a rounded corner structure, which has the same function as the roller 14 at the tail end of the lever 10. This facilitates the roller 14 to smoothly transition from the end of the limiting strip 9 to the inside of the limiting strip 9 when the first slide block 2 retracts, thus avoiding jamming.

[0035] Furthermore, such as Figure 3 As shown, a base 15 is fixedly installed on the first slide block 2. The bottom surface of the base 15 is provided with a sliding cavity 16 for the sliding of the locking block 7. The side surface of the base 15 is provided with a clearance groove 17 for the lever 10 to pass through and rotate. The clearance groove 17 is connected to the sliding cavity 16.

[0036] Furthermore, such as Figure 1-3As shown, the bottom end of the pin 12 is fixedly connected to the slide, and the top end of the pin 12 is fixedly connected to the top surface of the base 15 through the connecting plate 18. By fixing both the top and bottom ends of the pin 12, the installation structure of the lever 10 is made more stable.

[0037] Preferably, such as Figure 3-6 As shown, the reset element 11 includes a stop block 19 and a push rod 20. The push rod 20 is slidably embedded in the slide cavity 16, and the front end of the push rod 20 abuts against the locking block 7. A compression spring (not shown in the figure) is provided between the stop block 19 and the push rod 20 to force the locking block 7 to slide and lock the second slide seat 3. Blind holes are provided at the tail end of the push rod 20 and the end face of the stop block 19. The two ends of the compression spring are respectively embedded in the blind holes of the stop block 19 and the push rod 20 (the inner diameter of the blind hole of the stop block 19 matches the outer diameter of the push rod 20, and the tail end of the push rod 20 can be embedded in the blind hole of the stop block 19). The compression spring pushes the locking block 7 to lock through the push rod 20 by the preload, resulting in a stable structure and direct force transmission.

[0038] In practice, the push rod 20 can be omitted, and the compression spring can be placed directly between the stop block 19 and the locking block 7.

[0039] Optionally, the reset element 11 is a torsion spring (not shown in the figure). The torsion spring is sleeved outside the pin 12 and is used to force the lever 10 to rotate in the direction of driving the locking block 7 to slide and lock the second slide block 3. The torsion spring acts directly on the lever 10, causing it to rotate in the locking direction, and the structure is relatively simple.

[0040] Both of the above reset schemes can effectively provide the reset force required for locking the drive block 7, ensuring the timeliness and reliability of the locking action, and providing flexibility for different design requirements.

[0041] Preferably, such as Figure 4-6 As shown, the top surface of the front end of the locking block 7 is a downward slope, and the bottom surface is an upward slope. The top and bottom surfaces of the limiting block 8 are slopes that match the bottom and top surfaces of the front end of the locking block 7. By designing the top and bottom surfaces of the front end of the locking block 7 as downward and upward slopes respectively, and designing the corresponding contact surfaces of the limiting block 8 as matching slopes, this design can prevent the end face of the locking block 7 from colliding with the end face of the limiting block 8, and also prevent the locking block 7 from rubbing against the limiting block 8 during sliding.

[0042] The self-locking mechanism of this utility model works in close coordination with the main working cycle of the cold heading machine (first slide 2 forward / backward, second slide 3 lifting and lowering to switch the punch), realizing the core functions of automatic locking before stamping and automatic unlocking after stamping, ensuring that the second slide 3 (carrying the punch) does not vibrate vertically during stamping. The entire process can be divided into four stages:

[0043] 1) Initial preparation and slide forward movement phase:

[0044] The cold heading machine starts its working cycle, and the first drive component 4 drives the first slide block 2 to slide forward (towards the workpiece) along the horizontal slide rail on the frame 1.

[0045] At the same time, the second driving component drives the second slide block 3 to move to a predetermined height on the vertical slide rail at the front end of the first slide block 2, so that the first punch 5 or the second punch 6 that needs to work is aligned with the workpiece position (for example, so that the first punch 5 is in the working position for initial forging).

[0046] At this time, as the first slide block 2 is moving forward, the tail end (with roller 14) of the lever 10 installed on the first slide block 2 is located inside the limit bar 9 installed on the frame 1 and slides against the limit bar 9.

[0047] At this time, the reset element 11 (compression spring) is in a stored or pre-tightened state, and tends to drive the lever 10 to rotate, but the tail end of the lever 10 is temporarily constrained by the limit bar 9.

[0048] 2) Locking stage (before stamping):

[0049] like Figure 4 , 6 As shown, as the first slide block 2 continues to advance to the near stamping position, the tail end of the lever 10 completely leaves the constraint range of the limit bar 9 (at this time, the tail end of the lever 10 is located outside the end of the limit bar 9).

[0050] Once the constraint of the limit bar 9 is lost, the reset element 11 immediately releases its stored energy:

[0051] The compression spring pushes the push rod 20 to slide forward, and the front end of the push rod 20 pushes the locking block 7 to slide forward in the sliding cavity 16 of the base 15.

[0052] The sliding of the locking block 7 (transmitted by the compression spring through the lever 10) is linked to the rotation of the lever 10. The head end of the lever 10 is embedded in the locking groove 13 of the locking block 7. Therefore:

[0053] The compression spring pushes the locking block 7 to slide. The sliding of the locking block 7 will drive the head end of the lever 10 to move through the locking groove 13, thereby causing the lever 10 to rotate (at this time, the tail end has been disengaged from the limit bar 9 and can rotate freely).

[0054] The locking block 7 slides forward into position, and its front end (with a specific slope) slides into and locks above or below the limiting block 8 fixed on the second slide block 3. The slope of the locking block 7 and the slope of the limiting block 8 fit tightly together, creating a wedge-tightening effect.

[0055] like Figure 4As shown, when the locking block 7 is engaged below the limiting block 8, the second slide block 3 is in the upper limit position (due to the stroke limitation of the second drive component, the second slide block 3 cannot continue to slide upward), and the second punch 6 located below is in the working position. At this time, the locking block 7 and the limiting block 8 cooperate to prevent the second slide block 3 from sliding downward, so that the second slide block 3 can be rigidly locked and fixed in the vertical direction.

[0056] like Figure 6 As shown, when the locking block 7 is engaged above the limiting block 8, the second slide block 3 is in the lower limit position (due to the stroke limitation of the second drive component, the second slide block 3 cannot continue to slide downwards), and the first punch 5 located above is in the working position. At this time, the locking block 7 and the limiting block 8 cooperate to prevent the second slide block 3 from sliding upwards, so that the second slide block 3 can be rigidly locked and fixed in the vertical direction.

[0057] At this point, the second slide block 3 is rigidly locked and fixed in the vertical direction by the locking block 7 and the limiting block 8, preventing any up-and-down vibration on the vertical slide rail. At this time, either the first punch 5 or the second punch 6 is aligned with the workpiece, ready for upsetting.

[0058] 3) Pre-upsetting stage:

[0059] When the first slide block 2 reaches its final forward position, it performs a stamping action through the first stamping head or the second stamping head;

[0060] Locking state retention: During the entire stamping process, the locking block 7, under the action of the reset element 11 (spring force), continuously and steadily locks the limiting block 8, ensuring that the second slide block 3 and the working punch on it remain absolutely vertically stable when subjected to huge stamping force, without any loosening or shaking, thus completing the pre-building of the workpiece.

[0061] 4) Unlocking Phase:

[0062] After the stamping action is completed, the first drive component 4 drives the first slide block 2 to begin retracting backward (away from the workpiece) along the horizontal slide rail.

[0063] In the initial stage of retraction, as the first slide 2 moves backward, the tail end (roller 14) of the lever 10 mounted on the first slide 2 gradually approaches the limit bar 9.

[0064] When the tail end of lever 10 contacts the end of limit strip 9 (with rounded corners to reduce impact), as the first slide block 2 continues to retract, the tail end of lever 10 is blocked by the end of limit strip 9. This blocking action forces the tail end of lever 10 to rotate (counterclockwise) around pin 12. Since lever 10 is a rigid integral unit, its head end rotates accordingly. The head end of lever 10 is embedded in the slot 13 of the locking block 7, and its rotation forces the locking block 7 to slide backward in the sliding cavity 16. As the locking block 7 slides backward, its front end gradually disengages from above or below the limit block 8, releasing the locking constraint on the limit block 8 (i.e., the second slide block 3), as... Figure 5 As shown.

[0065] At this point, the second slide block 3 is unlocked, restoring its vertical movement freedom on the vertical slide rail. Now, the second drive component can drive the second slide block 3 to rise and fall, switching the punch (for example, switching the second punch 6 to the working position to prepare for precision forging).

[0066] During the process of sliding the locking block 7 backward to unlock, the reset element 11 (compression spring) is compressed and stored to prepare for the next locking action.

[0067] The subsequent fine forging action and the unlocking action after fine forging are the same as steps 3 and 4, and will not be described again in this embodiment.

[0068] This process is repeated continuously, ensuring automatic and reliable locking before each stamping action and automatic and timely unlocking after stamping.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking mechanism for a one-die two-punch cold heading machine, the cold heading machine comprising a frame (1), a first slide (2), a second slide (3), a first drive component (4), and a second drive component, wherein the first drive component (4) drives the first slide (2) to slide back and forth on a horizontal slide rail of the frame (1), and the second drive component drives the second slide (3) to slide up and down on a vertical slide rail at the front end of the first slide (2), wherein the front end of the second slide (3) is provided with a first punch (5) and a second punch (6) along the vertical direction; characterized in that, The self-locking mechanism includes a locking block (7), a limiting block (8), and a self-locking component. The locking block (7) is slidably mounted on the first slide block (2), and the limiting block (8) is fixedly mounted on the second slide block (3). The self-locking component is configured to: before the first punch (5) or the second punch (6) performs upsetting, drive the locking block (7) to slide above or below the limiting block (8) to lock the second slide block (3); after the first punch (5) or the second punch (6) completes upsetting, drive the locking block (7) to slide away from the limiting block (8) to unlock the second slide block (3).

2. The self-locking mechanism for a two-stroke cold heading machine as described in claim 1, characterized in that, The self-locking assembly includes a limiting strip (9), a lever (10), and a reset element (11). The limiting strip (9) is mounted on the frame (1). The lever (10) is rotatably mounted on the first slide (2) via a vertical pin (12). The side of the locking block (7) has a slot (13). The head end of the lever (10) is embedded in the slot (13), and the tail end of the lever (10) cooperates with the limiting strip (9). The limiting strip (9) and the lever (10) are configured to be upset in the first punch (5) or the second punch (6). Before, the tail end of the lever (10) disengages from the limiting strip (9), and the lever (10) is driven to rotate by the reset element (11), forcing the locking block (7) to slide above or below the limiting block (8) to lock the second slide (3); after the first punch (5) or the second punch (6) completes the upsetting, the tail end of the lever (10) is forced to rotate to the inside of the limiting strip (9) and slide against the limiting strip (9) by the retraction of the first slide (2), and the head end of the lever (10) rotates, forcing the locking block (7) to slide away from the limiting block (8) to unlock the second slide (3).

3. The self-locking mechanism for a two-stroke cold heading machine as described in claim 2, characterized in that, The tail end of the lever (10) is rotatably mounted with a roller (14) via a U-shaped frame.

4. The self-locking mechanism for a two-stroke cold heading machine as described in claim 2, characterized in that, The end of the limiting strip (9) is provided with a rounded corner structure.

5. A self-locking mechanism for a two-stroke cold heading machine as described in claim 2, characterized in that, A base (15) is fixedly installed on the first slide (2). The bottom surface of the base (15) is provided with a sliding cavity (16) for sliding the block (7). The side of the base (15) is provided with a clearance groove (17) for the lever (10) to pass through and rotate. The clearance groove (17) is connected to the sliding cavity (16).

6. The self-locking mechanism for a two-stroke cold heading machine as described in claim 5, characterized in that, The bottom end of the pin (12) is fixedly connected to the slide, and the top end of the pin (12) is fixedly connected to the top surface of the base (15) through the connecting plate (18).

7. A self-locking mechanism for a two-stroke cold heading machine as described in claim 5, characterized in that, The reset element (11) includes a stop (19) and a push rod (20). The push rod (20) is slidably embedded in the slide cavity (16), and the front end of the push rod (20) abuts against the locking block (7). A compression spring is provided between the stop (19) and the push rod (20) to force the locking block (7) to slide and lock the second slide seat (3). Blind holes are provided at the tail end of the push rod (20) and the end face of the stop (19). The two ends of the compression spring are respectively embedded in the blind holes of the stop (19) and the push rod (20).

8. A self-locking mechanism for a two-stroke cold heading machine as described in claim 2, characterized in that, The reset element (11) is a torsion spring, which is sleeved outside the pin (12) and is used to force the lever (10) to rotate in the direction of driving the locking block (7) to slide and lock the second slide (3).

9. A self-locking mechanism for a two-stroke cold heading machine as described in claim 1, characterized in that, The front top surface of the card block (7) is a downward slope, and the bottom surface is an upward slope. The top and bottom surfaces of the limiting block (8) are slopes that match the front bottom and top surfaces of the card block (7).

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