Female die ejection device of cold header

Abstract

The invention discloses a female die ejection device of a cold header, a slidable sliding heavy punch is arranged in a female die cavity, the front end of the sliding heavy punch is fixedly connected with a punching rod, and the rear end of the sliding heavy punch is connected with an ejection pipe through an elastic connecting piece; a limiting structure is further arranged between the first female die sleeve and the sliding heavy punch and used for limiting sliding of the sliding heavy punch. The elastic connecting piece and the limiting structure enable the sliding heavy hammer to have a first state that the sliding heavy hammer slides forwards along with pushing of the ejection pipe and the elastic connecting piece; in the second state, advancing is stopped under the limitation of the limiting structure, and the elastic connecting piece continuously compresses and deforms; in the third state, the limiting structure is released from the limiting state and slides forwards; and in the fourth state, the elastic connector slides backwards under the restoring force of the elastic connector. By the adoption of the specially-designed product ejection device, the punching rod can stably eject out a product part and then retract backwards in time, transverse movement after the part is clamped by the clamp is not hindered, and the part is prevented from falling off.

Description

Technical Field

[0001] The present application relates to the technical field of production of new energy vehicle parts, and in particular to a cold heading machine die ejection device. Background Art

[0002] The normal operating speed of an ordinary cold heading machine is 40-100 working cycles / minute. During operation, the spindle of the cold heading machine rotates continuously, and the crank slider mechanism is used to push the punch part back and forth, exerting pressure on the part, causing it to deform and complete the extrusion molding work. When the punch part of the cold heading machine completes the cold heading extrusion work, it begins to move away from the die. At this time, the die ejection mechanism starts to move, with the purpose of ejecting the extruded part out of the die. After that, the clamp clamps the part and starts to move horizontally to transport the part to the next station.

[0003] When producing parts of certain special shapes on a cold heading machine, for example, there is a pit at the bottom of the part shape. When the part is ejected from the mold after cold heading, the head of the mold punch is embedded in the pit of the part, and the two are in close contact. Therefore, when the clamp clamps the part and moves it laterally, the pit of the part and the head of the mold punch will interfere with each other, preventing the part from moving laterally. If the clamp is moved forcibly, the part cannot be clamped stably, and the part will shake severely during the clamping and transportation process, causing the part to fall and the clamping and delivery to fail; or the part is blocked from moving, so that it is tilted in the clamp and cannot enter the next station, resulting in production failure. Summary of the invention

[0004] To this end, the present application provides a cold heading machine die ejection device to solve the problem in the prior art that the demoulding parts will interfere with the punch rod when moving.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A cold heading machine die ejection device comprises a first die sleeve and a second die sleeve arranged in a die cavity, wherein the first die sleeve is located at the rear end of the second die sleeve; a slidable ejection tube and a punch are arranged in the die cavity, a first slideway for the ejection tube to slide is provided in the first die sleeve, a second slideway for the punch to slide is provided in the second die sleeve, and the first slideway and the second slideway are arranged coaxially; the characteristic is that a slidable sliding weight is also provided in the die cavity, a third slideway for the sliding weight to slide is provided in the first die sleeve, the third slideway is located between the first slideway and the second slideway, and is coaxial with and connected to 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 connector; a limiting structure is also 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 connector and the limiting structure enable the sliding weight to include:

[0008] A first state in which the ejector tube and the elastic connector push and slide forward;

[0009] The elastic connecting member stops moving forward due to the restriction of the limiting structure, and the elastic connecting member continues to be compressed and deformed in the second state;

[0010] The limiting state of the limiting structure is released, and the third state of sliding forward is achieved;

[0011] And a fourth state in which the vehicle slides backwards due to 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 sleeve, the sleeve is sleeved on the front end periphery of the core body and leaves a gap between the sleeve and the outer wall of the core body; the elastic connecting piece is wrapped around the periphery of the core body, one end is fixed to the core body and the sleeve, and the other end is fixed to the front end surface of the ejector tube.

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

[0015] Optionally, the marble assembly includes a spring and a fixed tube, wherein the spring is disposed in the fixed tube and is used to connect the steel ball and the fixed tube; when the spring is in a free state, the steel ball partially extends out of the fixed tube.

[0016] Optionally, a clearance groove for inserting a steel ball is further provided on the side wall of the sliding weight, the clearance groove is arranged behind the clamping slot, and the length of the clearance groove is greater than the diameter of the steel ball.

[0017] Optionally, the clamping groove and the giving way groove are both arranged around the axis of the sliding weight and around the sliding weight to form an annular groove structure.

[0018] Optionally, a friction block is provided in the first die sleeve near the rear end, and the friction block always abuts against the side wall of the ejector tube when the ejector tube slides forward and backward.

[0019] Optionally, the friction block is a cylindrical structure, and its axis is perpendicular to the axis of the first slideway; a plurality of friction blocks are provided and are evenly distributed along the circumference 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 3A schematic structural diagram of a cold heading machine die ejection device in a third state provided in an embodiment of the present application;

[0031] Figure 4 A side view of a cold heading machine die ejection device provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Die cavity; 2. First die sleeve; 3. Second die sleeve; 4. Ejector tube; 5. Punch rod; 51. Ejector part; 52. Connecting part; 6. First slideway; 7. Second slideway; 8. Sliding weight; 81. Core body; 82. Sleeve; 9. Third slideway; 10. Elastic connector; 11. Slot; 12. Steel ball; 13. Fixed tube; 14. Clearance groove; 15. Friction block; 16. First balancing hole; 17. Second balancing hole. DETAILED DESCRIPTION

[0034] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

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

[0036] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually used to indicate the general relative position relationship for the purpose of intuitive understanding by referring to the drawings, and are not absolute limitations on the position relationship in the actual product.

[0037] A cold heading machine die ejection device, referring to Figure 1-Figure 4 , including 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 ejector tube 4 and a punch 5 that can slide left and right are arranged in the die cavity 1, a first slideway 6 for the ejector 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 arranged coaxially. The ejector tube 4 is a standard mold of a 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 slot 11 is a C-shaped slot, which is provided on the side wall of the sliding weight 8, and its position corresponds to the position of the marble assembly, and is used for inserting the extended part of the steel ball 12. The steel ball 12 moves up and down to enter and exit the 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 position at the rear end. At this time, the slot 11 is at the rear of the marble assembly, and the steel ball 12 abuts against the side wall of the sliding weight 8, without affecting its left and 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 connector 10, gradually ejecting the part.

[0049] Second state: As the sliding weight 8 slides forward, the slot 11 gradually approaches the marble assembly until the slot 11 corresponds to the position of the marble assembly, and the steel ball 12 is pushed out by the spring and stuck inside the slot 11, thereby limiting the movement of the sliding weight 8, and the parts and the punch 5 stop moving synchronously with the sliding weight 8. In this process, the ejector tube 4 keeps moving forward, and the sliding weight 8 cannot move due to the limiting effect of the steel ball 12 and the slot 11, causing the elastic connector 10 to be gradually compressed and deformed.

[0050] The third state: when the ejection tube 4 moves to the point where the front end surface contacts the rear end surface of the sliding weight 8, the ejection tube 4 exerts a rigid forward thrust on the sliding weight 8 until the front end surface of the ejection tube 4 contacts the front end surface of the first slideway 6. In this process, the elastic force of the spring is not enough to support the steel ball 12 to cooperate with the card slot 11 to resist the thrust, so the steel ball 12 slides out of the card slot 11 and retracts into the fixed tube 13. The sliding weight 8 carries the punch 5 forward for a distance (about 10 mm) under the thrust of the elastic connector 10 after compression and accumulation of force, and then continues to move forward due to the inertia of the movement of the combination of the sliding weight 8 and the punch 5, completely ejecting the part. At this time, the clamp can clamp the part. The elastic connector 10 is stretched in this process until the connecting portion 52 of the punch 5 reaches the front end surface of the third slideway 9.

[0051] Fourth state: the punch rod 5 and the sliding weight 8 stop moving forward, and the elastic connector 10 begins to shrink 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, the position of the product part no longer moves, so the withdrawal of the punch rod 5 can be separated from the part.

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

[0053] After the parts are ejected, the new parts to be processed are pushed from front to back into the die cavity 1, and the punch 5, the sliding weight 8 and the ejector tube 4 move backward to reset the entire device. This cycle is repeated to achieve the purpose of stable clamping and delivery of product parts.

[0054] In the third state and the fourth state, the steel ball 12 will abut against the side wall of the sliding weight 8. In order to prevent the steel ball 12 from affecting the movement of the sliding weight 8, a clearance groove 14 is also provided on the side wall of the sliding weight 8. The clearance groove 14 can be inserted with the steel ball 12, and the steel ball 12 will not contact the bottom of the clearance groove 14 after being inserted. Furthermore, the clearance groove 14 is located behind the slot 11, and the length of the clearance groove 14 is set to be greater than the diameter of the steel ball 12, so that when the sliding weight 8 moves forward and backward in the third and fourth states, the steel ball 12 can always be in the clearance groove 14, and will not affect the sliding weight 8.

[0055] Furthermore, in order to avoid the sliding weight 8 from deflecting during movement and causing inaccurate matching between the steel ball 12 and the slot 11, in the embodiment of the present application, the slot 11 and the clearance groove 14 are set as an annular groove structure, that is, they are set around the axis of the sliding weight 8.

[0056] In order to prevent the ejector tube 4 from moving freely during the movement, a friction block 15 is arranged near the rear end of the first die sleeve 2, so that the friction block 15 always abuts 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 a cylindrical structure, and its axis is perpendicular to the axis of the first slideway 6. In addition, multiple friction blocks 15 are arranged and evenly distributed along the circumference of the first die sleeve 2. In the embodiment of the present application, two friction blocks 15 are arranged, both of which are arranged on the same diameter line of the first die sleeve 2.

[0057] 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 penetrates the front and rear end surfaces of the ejector tube 4, and the second balancing hole 17 penetrates the front and rear end surfaces of the sliding weight 8. The first balancing hole 16, the second balancing hole 17, the sliding weight 8 and the ejector tube 4 are all coaxially arranged. By providing the first balancing hole 16 and the second balancing hole 17, air is kept flowing at the front and rear ends of the ejector tube 4, and the air pressure balance at the two ends is maintained.

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

[0059] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of 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; A second state in which the elastic connecting member (10) stops moving forward due to the restriction of the limiting structure and 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 backwards due to the restoring force of the elastic connecting member (10).

2. The cold heading machine die ejection device according to claim 1, characterized in that: The elastic connecting member (10) is a spring.

3. The cold heading machine die ejection device according to claim 2, characterized in that: The sliding weight (8) comprises a core body (81) and a sleeve (82), wherein 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 piece (10) is wound around the outer periphery of the core body (81), one end of which is fixed on the core body (81) and the sleeve (82), and the other end of which is fixed on the front end surface of the ejector tube (4).

4. The cold heading machine die ejection device according to claim 1, characterized in that: The limiting structure comprises a marble assembly and a slot (11); the marble assembly is arranged in the first die sleeve (2); a movable steel ball (12) is arranged at the end of the marble assembly; the slot (11) is opened on the side wall of the sliding weight (8) for partially inserting the steel ball (12); the steel ball (12) moves up and down to enter and exit the slot (11).

5. The cold heading machine die ejection device according to claim 4, characterized in that: The marble assembly comprises a spring and a fixed tube (13); the spring is arranged in the fixed tube (13) and is used 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).

6. The cold heading machine die ejection device according to claim 4 or 5, characterized in that: A clearance groove (14) for inserting the steel ball (12) is also provided on the side wall of the sliding weight (8). The clearance groove (14) is arranged behind the clamping groove (11), and the length of the clearance groove (14) is greater than the diameter of the steel ball (12).

7. The cold heading machine die ejection device according to claim 6, 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 circumference of the sliding weight (8), forming an annular groove structure.

8. The cold heading machine die ejection device according to claim 1, characterized in that: A friction block (15) is provided near the rear end of 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).

9. The cold heading machine die ejection device according to claim 8, 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).

10. 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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