A cold heading machine female die ejection device

Abstract

The present application discloses a die ejecting device for a cold heading machine. A slidable sliding weight is arranged in the die cavity. The front end of the sliding weight is fixedly connected to a punch rod, and the rear end is connected to an ejecting pipe through an elastic connecting piece. A limiting structure is further arranged between the first die sleeve and the sliding weight, and the limiting structure is used to limit the sliding of the sliding weight. The elastic connecting piece and the limiting structure enable the sliding weight to include: a first state of sliding forward under the push of the ejecting pipe and the elastic connecting piece; a second state of stopping advancing under the limitation of the limiting structure and the elastic connecting piece continuing to be compressed and deformed; a third state of sliding forward after the limiting state of the limiting structure is released; and a fourth state of sliding backward under the restoring force of the elastic connecting piece. The present application adopts a specially designed product ejecting device, so that the punch rod ejects the product parts relatively steadily and then retracts in time, without interfering with the lateral movement of the clamp after clamping the parts, and preventing the occurrence of part dropping.

Description

Technical Field

[0001] This application relates to the technical field of new energy vehicle parts production, and specifically relates to an ejection device for the female die of a cold heading machine. Background Art

[0002] The normal operating speed of an ordinary cold heading machine is 40 - 100 working cycles per minute. During operation, the main shaft of the cold heading machine rotates continuously. Using the crank-slider mechanism, it pushes the punch part to reciprocate back and forth, applying pressure to the part to cause deformation and completing the extrusion forming work. When the punch part of the cold heading machine finishes the cold heading extrusion work, it starts to move away from the female die. At this time, the ejection mechanism of the female die starts to act, aiming to eject the part that has completed extrusion from the female die. Then the clamp holds the part and starts to move horizontally, transporting the part to the next working station.

[0003] When producing some parts with special shapes on a cold heading machine, for example, there is a concave pit at the bottom of the outer shape of the part. When the part is ejected from the mold after cold heading forming, due to the protrusion of the head of the mold punch rod being embedded in the concave pit of the part, the two are in close contact. Therefore, when the clamp holds the part and moves horizontally, interference will occur between the concave pit of the part and the head of the mold punch rod, preventing the part from moving horizontally. If the clamp forcibly moves, the part cannot be stably held, and the part will shake severely during the clamping and transportation process, resulting in the part falling off and the clamping and feeding failing; or the part is blocked during movement, making it in an inclined state when in the clamp and unable to enter the next working station, resulting in the production being unable to proceed. Summary of the Invention

[0004] Therefore, this application provides an ejection device for the female die of a cold heading machine to solve the problem that the ejected part will interfere with the punch rod during movement in the prior art.

[0005] To achieve the above object, this application provides the following technical solutions:

[0006] An ejection device for the female die of a cold heading machine includes a first female die sleeve and a second female die sleeve arranged in the female die cavity, and the first female die sleeve is at the rear end of the second female die sleeve; a slidable ejection tube and a punch rod are arranged in the female die cavity. A first slideway for the ejection tube to slide is opened in the first female die sleeve, and a second slideway for the punch rod to slide is opened in the second female die sleeve. The first slideway and the second slideway are coaxially arranged; it is characterized in that: a slidable sliding weight is further arranged in the female die cavity, and a third slideway for the sliding weight to slide is opened in the first female die sleeve. The third slideway is between the first slideway and the second slideway, and is coaxial and communicated with the first slideway and the second slideway.

[0007] The front end of the sliding weight is fixedly connected to the punch rod, and the rear end is connected to the ejector tube through an elastic connecting member; a limiting structure is further provided between the first die sleeve and the sliding weight, and the limiting structure is used to limit the sliding of the sliding weight; the elastic connecting member and the limiting structure enable the sliding weight to include:

[0008] A first state of sliding forward along with the pushing of the ejector tube and the elastic connecting member;

[0009] A second state of stopping advancing under the restriction of the limiting structure and continuous compression deformation of the elastic connecting member;

[0010] A third state of releasing the limiting state of the limiting structure and sliding forward;

[0011] And a fourth state of sliding backward under the restoring force of the elastic connecting member.

[0012] Optionally, the elastic connecting member is a spring.

[0013] Optionally, the sliding weight includes a core body and a casing, the casing is sleeved on the outer periphery of the front end of the core body, and a gap is left between the casing and the outer wall of the core body; the elastic connecting member is wound around the outer periphery of the core body, one end is fixed on the core body and the casing, and the other end is fixed on the front end face of the ejector tube.

[0014] Optionally, the limiting structure includes a ball component and a card slot, the ball component is arranged in the first die sleeve, and a movable steel ball is arranged at the end of the ball component; the card slot is opened on the side wall of the sliding weight for part of the steel ball to be inserted, and the steel ball moves up and down to enter and exit the card slot.

[0015] Optionally, the ball component includes a spring and a fixed tube, the spring is arranged in the fixed tube for connecting the steel ball and the fixed tube; in the free state of the spring, part of the steel ball extends out of the fixed tube.

[0016] Optionally, a relief groove for the steel ball to be inserted is further opened on the side wall of the sliding weight, the relief groove is arranged behind the card slot, and the length of the relief groove is greater than the diameter of the steel ball.

[0017] Optionally, both the card slot and the relief groove are arranged around the axis of the sliding weight for one week to form an annular groove structure.

[0018] Optionally, a friction block is arranged at a position near the rear end in the first die sleeve, and the friction block always abuts against the side wall of the ejector tube when the ejector tube slides back and forth.

[0019] Optionally, the friction block is of a cylindrical structure, and its axis is perpendicular to the axis of the first slideway; a plurality of friction blocks are arranged and are evenly distributed along the circumferential direction of the first die sleeve.

[0020] Optionally, a first balancing hole is opened inside the ejection tube, and a second balancing hole is opened inside the sliding weight; the first balancing hole passes through the front and rear end surfaces of the ejection tube, and the second balancing hole passes through the front and rear end surfaces of the sliding weight; the first balancing hole is coaxial with the second balancing hole.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. Through the cooperation of the elastic connector and the limiting structure, the punch can eject the parts, the clamp clamps the product parts, and the position of the product parts no longer moves. The punch can retreat a distance to separate from the parts, so that when the clamp clamps the product parts and starts to move horizontally, the movement of the product parts and the punch have no motion interference.

[0023] 2. The surface of the steel ball is smooth and curved, and it has its own guiding function. Therefore, when the ejector tube applies thrust to the sliding weight, the steel ball can slide out of the slot and release the limiting state of the sliding weight.

[0024] 3. The setting of the clearance groove prevents the steel ball from contacting the side wall of the sliding weight, thereby not affecting the left and right movement of the sliding weight.

[0025] 4. The friction block can generate friction with the surface of the ejector tube, so that the left and right movement of the ejector tube is stable and will not move freely in the left and right directions.

[0026] 5. The setting of the first balance hole and the second balance hole ensures that the air at both ends always circulates during the left and right movement of the sliding weight and the ejection tube, thus keeping the air pressure at both ends consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0028] Figure 1 A schematic structural diagram of a cold heading machine die ejection device in a first state provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0030] Figure 3Schematic structural diagram of a cold heading machine die ejecting device provided by an embodiment of the present application in a third state;

[0031] Figure 4 Side view of a cold heading machine die ejecting device provided by an embodiment of the present application.

[0032] Explanation of reference numerals:

[0033] 1. Die cavity; 2. First die sleeve; 3. Second die sleeve; 4. Ejecting pipe; 5. Punch rod; 51. Ejecting part; 52. Connecting part; 6. First slideway; 7. Second slideway; 8. Sliding weight; 81. Core body; 82. Sleeve; 9. Third slideway; 10. Elastic connecting piece; 11. Card slot; 12. Steel ball; 13. Fixed pipe; 14. Relief groove; 15. Friction block; 16. First balance hole; 17. Second balance hole. Detailed implementation manners

[0034] The present application will be further described in detail below with reference to the accompanying drawings through specific embodiments.

[0035] In the description of the present application: Unless otherwise specified, "a plurality of" means two or more. Terms such as "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance degree or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0036] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in the present application are usually indications of the general relative position relationship for the convenience of intuitively understanding with reference to the accompanying drawings, and are not absolute limitations on the position relationship in the actual product.

[0037] A cold heading machine die ejecting device, referring to Figures 1-4 , includes a first die sleeve 2 and a second die sleeve 3 arranged in a die cavity 1, and the first die sleeve 2 is at the rear end of the second die sleeve 3. An ejecting pipe 4 and a punch rod 5 that can slide left and right are arranged in the die cavity 1. A first slideway 6 for the ejecting pipe 4 to slide is opened in the first die sleeve 2, and a second slideway 7 for the punch rod 5 to slide is opened in the second die sleeve 3. The first slideway 6 and the second slideway 7 are coaxially arranged. The ejecting pipe 4 is a standard die of the cold heading machine and can reciprocate left and right under the action of the cold heading machine.

[0038] In the embodiment of the present application, a sliding weight 8 that can slide left and right is also provided in the die cavity 1, and correspondingly, a third slideway 9 for sliding the sliding weight 8 is provided in the first die sleeve 2. The third slideway 9 is located between the first slideway 6 and the second slideway 7, and is coaxial with and connected to the first slideway 6 and the second slideway 7. The front end of the sliding weight 8 is fixedly connected to the punch 5 by brazing, and the rear end is connected to the ejector tube 4 by an elastic connector 10.

[0039] Specifically, the punch 5 includes an ejection portion 51 and a connection portion 52, both of which are cylindrical structures, wherein the two are integrally formed, and the connection portion 52 is located at the rear end of the ejection portion 51. The connection portion 52 is located in the third slideway 9, and its diameter is equal to the outer diameter of the sliding weight 8, both of which are larger than the diameter of the ejection portion 51. The outer diameter of the ejection tube 4 is larger than the outer diameter of the sliding weight 8.

[0040] In the embodiment of the present application, the elastic connector 10 is a spring. The sliding weight 8 includes a core 81 and a sleeve 82, and the sleeve 82 is sleeved on the outer periphery of the front end of the core 81, and a gap is left between the sleeve 82 and the outer wall of the core 81. The elastic connector 10 is wound around the outer periphery of the core 81, one end of which is fixed to the core 81 and the sleeve 82, and the other end is fixed to the front end surface of the ejector tube 4.

[0041] Furthermore, in order to realize the function of retreating the sliding weight 8 after ejection, a limiting structure is further provided between the first die sleeve 2 and the sliding weight 8, and the limiting structure is used to limit the sliding of the sliding weight 8. The elastic connecting member 10 cooperates with the limiting structure so that the sliding weight 8 includes:

[0042] (1) A first state in which the ejector tube 4 and the elastic connector 10 push and slide forward;

[0043] (2) The elastic connector 10 is in a second state where the connector stops moving due to the restriction of the position limiting structure and continues to be compressed and deformed;

[0044] (3) releasing the limiting state of the limiting structure and sliding forward to the third state;

[0045] (4) and a fourth state in which the elastic connecting member 10 slides backward due to the restoring force of the elastic connecting member 10.

[0046] Specifically, the limiting structure includes a marble assembly and a slot 11. The marble assembly is arranged in the first die sleeve 2, and includes a steel ball 12, a spring (not shown in the figure) and a fixed tube 13. The steel ball 12 is a spherical structure with a smooth surface. The spring is arranged in the fixed tube 13 to connect the steel ball 12 and the fixed tube 13. When the spring is in a free state, the steel ball 12 partially extends out of the fixed tube 13, and the extension distance is not greater than the radius of the steel ball 12. Under the connection action of the spring, the steel ball 12 can move relative to the fixed tube 13.

[0047] The card slot 11 is a C-shaped groove, which is opened on the side wall of the sliding weight 8. Its position corresponds to that of the ball component and is used for the protruding part of the steel ball 12 to be inserted. Among them, the steel ball 12 moves up and down to enter and exit the card slot 11.

[0048] Thus, in the first state, the part cooperates with the punch rod 5, and the punch rod 5, the sliding weight 8, and the ejector tube 4 are all in the initial positions at the rear end. At this time, the card slot 11 is behind the ball component, and the steel ball 12 abuts against the side wall of the sliding weight 8, without affecting its left-right sliding. When the part needs to be ejected, the ejector tube 4 slides forward and pushes the punch rod 5 and the sliding weight 8 forward through the elastic connecting piece 10, gradually ejecting the part.

[0049] Second state: As the sliding weight 8 slides forward, the card slot 11 gradually approaches the ball component until the positions of the card slot 11 and the ball component correspond. Then the steel ball 12 is pushed out under the action of the spring and gets stuck inside the card slot 11, thereby restricting the movement of the sliding weight 8. At the same time, the part, the punch rod 5, and the sliding weight 8 stop moving synchronously. During this process, the ejector tube 4 continuously moves forward. Since the sliding weight 8 cannot move under the limiting action of the steel ball 12 and the card slot 11, the elastic connecting piece 10 is gradually compressed and deformed.

[0050] Third state: When the front end face of the ejector tube 4 moves to contact the rear end face of the sliding weight 8, the ejector tube 4 has a hard forward thrust on the sliding weight 8 until the front end face of the ejector tube 4 contacts the front end face of the first slideway 6. During this process, the elastic force of the spring is not enough to support the cooperation between the steel ball 12 and the card slot 11 to resist this thrust. Therefore, the steel ball 12 slides out of the card slot 11 and retracts into the fixed tube 13. The sliding weight 8 drives the punch rod 5 to rush forward a certain distance (about 10 mm) under the thrust after the elastic connecting piece 10 is compressed and stores energy. Subsequently, due to the movement inertia of the combination of the sliding weight 8 and the punch rod 5, it continues to move forward and completely ejects the part. At this time, the clamp can clamp the part. The elastic connecting piece 10 is stretched during this process until the connecting part 52 of the punch rod 5 reaches the front end face of the third slideway 9.

[0051] Fourth state: The punch rod 5 and the sliding weight 8 stop advancing. At this time, the elastic connecting piece 10 begins to contract and rebound (about 3 - 5 mm), pulling the sliding weight 8 and the punch rod 5 to slide backward. Since the clamp clamps the product part and the position of the product part no longer moves, the backward movement of the punch rod 5 can disengage from the part.

[0052] After that, the clamp holds the product part and starts to move laterally, avoiding the movement interference between the punch rod 5 and the part.

[0053] After the part is ejected, the new part to be processed is pushed into the female die cavity 1 from front to back, and drives the punch rod 5, the sliding weight 8 and the ejector tube 4 to move backward, resetting the entire device. In this way, it cycles continuously, achieving the purpose of stable clamping and feeding of the product parts.

[0054] In the third and fourth states, the steel ball 12 abuts against the side wall of the sliding weight 8. To prevent the steel ball 12 from affecting the movement of the sliding weight 8, a relief groove 14 is also provided on the side wall of the sliding weight 8. The relief groove 14 can accommodate the steel ball 12, and the steel ball 12 will not contact the bottom of the relief groove 14 after insertion. Further, the relief groove 14 is behind the clamping groove 11, and the length of the relief groove 14 is set to be greater than the diameter of the steel ball 12, so that when the sliding weight 8 moves back and forth in the third and fourth states, the steel ball 12 can always be in the relief groove 14 without affecting the sliding weight 8.

[0055] Further, to prevent the sliding weight 8 from deflecting during movement, resulting in inaccurate cooperation between the steel ball 12 and the clamping groove 11, in the embodiment of the present application, the clamping groove 11 and the relief groove 14 are set as annular groove structures, that is, arranged in a circle around the axis of the sliding weight 8.

[0056] To prevent the ejector tube 4 from freely moving during movement, friction blocks 15 are provided at a position near the rear end of the first female die sleeve 2, so that the friction blocks 15 always abut against the side wall of the ejector tube 4 during the forward and backward sliding of the ejector tube 4. The friction block 15 is of a cylindrical structure, and its axis is perpendicular to the axis of the first slideway 6. And a plurality of friction blocks 15 are provided and evenly distributed along the circumferential direction of the first female die sleeve 2. In the embodiment of the present application, two friction blocks 15 are provided and are both arranged on the same diameter line of the first female die sleeve 2.

[0057] A first balance hole 16 is provided inside the ejector tube 4, and a second balance hole 17 is provided inside the sliding weight 8. The first balance hole 16 penetrates through the front and rear end faces of the ejector tube 4, and the second balance hole 17 penetrates through the front and rear end faces of the sliding weight 8. The first balance hole 16, the second balance hole 17, the sliding weight 8 and the ejector tube 4 are all coaxially arranged. Through the setting of the first balance hole 16 and the second balance hole 17, the air at the front and rear ends of the ejector tube 4 remains flowing, maintaining the air pressure balance at both ends.

[0058] In the present application, the diameter of the first slideway 6 is adapted to the outer diameter of the ejector tube 4, the diameter of the second slideway 7 is adapted to the diameter of the ejecting part 51 of the punch rod 5, and the diameter of the third slideway 9 is matched with the outer diameter of the sliding weight 8 and the diameter of the connecting part 52 of the punch rod 5.

[0059] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written out should also be considered to be within the scope described in this specification.

Claims

1. A cold heading machine die ejection device, comprising a first die sleeve (2) and a second die sleeve (3) arranged in a die cavity (1), wherein the first die sleeve (2) is located at the rear end of the second die sleeve (3); a slidable ejection tube (4) and a punch (5) are arranged in the die cavity (1), a first slideway (6) for the ejection tube (4) to slide is provided in the first die sleeve (2), and a second slideway (7) for the punch (5) to slide is provided in the second die sleeve (3), and the first slideway (6) and the second slideway (7) are coaxially arranged; characterized in that: A slidable sliding weight (8) is also provided in the die cavity (1), and a third slideway (9) for the sliding weight (8) to slide is provided in the first die sleeve (2), and the third slideway (9) is located between the first slideway (6) and the second slideway (7), and is coaxial with and connected to the first slideway (6) and the second slideway (7); The front end of the sliding weight (8) is fixedly connected to the punch rod (5), and the rear end is connected to the ejector tube (4) via an elastic connector (10); a limiting structure is also provided between the first die sleeve (2) and the sliding weight (8), and the limiting structure is used to limit the sliding of the sliding weight (8); the elastic connector (10) and the limiting structure enable the sliding weight (8) to include: A first state in which the ejector tube (4) and the elastic connecting member (10) slide forward as they are pushed; The elastic connecting member (10) stops moving forward due to the restriction of the limiting structure, and is in a second state where the elastic connecting member (10) continues to be compressed and deformed; The limiting state of the limiting structure is released, and the third state of sliding forward is achieved; and a fourth state in which the elastic connecting member (10) slides backward due to the restoring force of the elastic connecting member (10); The elastic connecting member (10) is a spring; the sliding weight (8) comprises a core body (81) and a sleeve (82); the sleeve (82) is sleeved on the outer periphery of the front end of the core body (81) and a gap is left between the sleeve and the outer wall of the core body (81); the elastic connecting member (10) is wound around the outer periphery of the core body (81), one end of the elastic connecting member (10) is fixed on the core body (81) and the sleeve (82), and the other end is fixed on the front end surface of the ejector tube (4); The limiting structure comprises a marble assembly and a slot (11), wherein the marble assembly is arranged in the first die sleeve (2), and a movable steel ball (12) is arranged at the end of the marble assembly; the slot (11) is provided on the side wall of the sliding weight (8) for partially inserting the steel ball (12), and the steel ball (12) moves up and down to enter and exit the slot (11); the marble assembly comprises a spring and a fixed tube (13), wherein the spring is arranged in the fixed tube (13) for connecting the steel ball (12) and the fixed tube (13); when the spring is in a free state, the steel ball (12) partially extends out of the fixed tube (13); a clearance groove (14) for inserting the steel ball (12) is also provided on the side wall of the sliding weight (8), wherein the clearance groove (14) is arranged behind the slot (11), and the length of the clearance groove (14) is greater than the diameter of the steel ball (12).

2. The cold heading machine die ejection device according to claim 1, characterized in that: The clamping groove (11) and the giving way groove (14) are both arranged around the axis of the sliding weight (8) and around the periphery of the sliding weight (8), forming an annular groove structure.

3. The cold heading machine die ejection device according to claim 1, characterized in that: A friction block (15) is provided near the rear end in the first die sleeve (2), and when the ejector tube (4) slides forward and backward, the friction block (15) always abuts against the side wall of the ejector tube (4).

4. The cold heading machine die ejection device according to claim 3, characterized in that: The friction block (15) is a cylindrical structure, and its axis is perpendicular to the axis of the first slideway (6); a plurality of friction blocks (15) are provided and are evenly distributed along the circumference of the first die sleeve (2).

5. The cold heading machine die ejection device according to claim 1, characterized in that: A first balancing hole (16) is provided inside the ejector tube (4), and a second balancing hole (17) is provided inside the sliding weight (8); the first balancing hole (16) passes through the front and rear end surfaces of the ejector tube (4), and the second balancing hole (17) passes through the front and rear end surfaces of the sliding weight (8); the first balancing hole (16) and the second balancing hole (17) are coaxial.

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