Rear through stroke adjusting mechanism of cold header

Abstract

The utility model discloses a rear through stroke adjusting mechanism of a cold header, which comprises a die and an ejector rod, the ejector rod is aligned with an inner cavity of the die to do reciprocating linear guide telescopic motion, the rear through stroke adjusting mechanism further comprises a transmission swing arm, a driving swing arm and a reset mechanism, the driving swing arm is driven by an eccentric connecting rod and swings back and forth at a certain angle, and a guide push plate is mounted on the driving swing arm. The stress end of the transmission swing arm is provided with a supporting rod capable of being telescopically adjusted, the supporting rod is provided with a roller, the roller makes contact with the guide push plate, the impact end of the transmission swing arm is provided with an ejector pin, the end of the ejector pin makes contact with the tail end of the ejector rod, and the reset mechanism drives the transmission swing arm to reset so that the ejector pin can be away from the ejector rod. In this way, the ejection stroke of the rear through pipe can be adjusted, and therefore the forming requirements of bars of different specifications are met.

Description

Technical Field

[0001] The utility model relates to the field of cold heading machines, and particularly relates to a rear through stroke adjusting mechanism of a cold heading machine. Background Technique

[0002] A cold heading forming machine is a device that cold-extrudes various processed metal wire rods to make the wire rods cold-heading and form inside a mold, and is used for processing various standard and non-standard fasteners and auto and motorcycle parts. At present, the function of the rear through ejection device is to eject the workpiece in the cavity of the cold heading bottom die after cold heading. During operation, first, the cold heading punch impacts the top of the workpiece, so that the workpiece is formed in the bottom die cavity of the cold heading die, and then the rear through ejector rod is used for ejection.

[0003] When the rear through ejector rod ejects, the ejection stroke is generally fixed and cannot be adjusted greatly according to the size specifications and volume of the workpiece. As a result, when the rear through ejector rod ejects the workpiece, sometimes due to the insufficient stroke of the rear through ejector rod, the workpiece ejection is not smooth enough, which greatly affects the forming quality of the workpiece. Content of the Utility Model

[0004] To solve the above problems, the purpose of the utility model is to provide a rear through stroke adjusting mechanism that can adjust the rear through ejection stroke, so as to ensure the forming requirements of different specifications of bar materials.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A rear through stroke adjusting mechanism of a cold heading machine includes a mold and an ejector rod. The ejector rod makes a reciprocating linear guiding telescopic movement towards the inner cavity of the mold, and further includes a transmission swing arm, a driving swing arm, and a reset mechanism. The driving swing arm is driven by an eccentric connecting rod and swings back and forth at a certain angle. A guiding push plate is installed on the driving swing arm. A telescopic adjustable support rod is provided at the force-receiving end of the transmission swing arm. A roller is provided on the support rod, and the roller contacts the guiding push plate. A ejector pin is arranged at the impact end of the transmission swing arm, and the end of the ejector pin contacts the tail end of the ejector rod. The reset mechanism drives the transmission swing to reset to make the ejector pin away from the ejector rod.

[0006] A guiding cavity for the telescopic movement of the support rod is arranged inside the transmission swing arm. The bottom of the guiding cavity is connected with a rotatable adjusting bolt, and the adjusting bolt is in threaded transmission connection with the support rod.

[0007] The reset mechanism includes a reset spring, a top shaft, and a sleeve. The reset spring is placed inside the sleeve. A limiting plate is arranged at one end of the top shaft located inside the inner cavity of the sleeve. One end of the reset spring abuts against the limiting plate, and the end of the top shaft located outside the sleeve contacts the transmission swing arm.

[0008] The beneficial effects of the present utility model are as follows: The telescopic adjustment of the support rod on the transmission swing arm can change the distance between the roller and the rotation center of the transmission swing arm. Since the swing amplitude of the driving swing arm is fixed, the longer the distance that the roller extends, the longer the sliding distance along the guiding push plate on the driving swing arm, and the swing amplitude of the impact end decreases, thereby reducing the stroke of the ejector rod. The shorter the distance that the roller extends, the greater the swing amplitude of the impact end, thereby increasing the stroke of the ejector rod. In this way, the stroke of the rear through-ejector can be adjusted to ensure the forming requirements of bar materials of different specifications.

[0009] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0010] Figure 1 It is a state diagram of the long-stroke state ejection of the specific embodiment of the present utility model;

[0011] Figure 2 It is a state diagram of the long-stroke state return of the specific embodiment of the present utility model;

[0012] Figure 3 It is a state diagram of the short-stroke state ejection of the specific embodiment of the present utility model;

[0013] Figure 4 It is a state diagram of the short-stroke state return of the specific embodiment of the present utility model.

[0014] In the figure, 1 is a mold; 2 is an ejector rod; 3 is a transmission swing arm; 4 is a driving swing arm; 5 is a reset mechanism; 6 is an eccentric connecting rod; 7 is a support rod; 8 is a roller; 31 is a thimble; 32 is a guiding cavity; 41 is a guiding push plate; 51 is a reset spring; 52 is a top shaft; 53 is a sleeve. Specific Embodiments

[0015] The following specifically describes the present utility model through embodiments, which are only used for further illustration of the present utility model and should not be construed as limiting the protection scope of the present utility model.

[0016] Such as Figure 1 — Figure 4As shown in the figure, this embodiment discloses a rear stroke adjustment mechanism for a cold heading machine, which includes a die 1 and a thimble 2. After the bar stock is cut, it is placed into the die 1 through a clamp. The front and rear parts of the thimble 2 are respectively inserted into the guiding sleeve, so that the thimble 2 aligns with the inner cavity of the die 1 and makes a reciprocating linear guiding telescopic movement. It also includes a transmission swing arm 3, a driving swing arm 4, and a reset mechanism 5. The driving swing arm 4 is driven by an eccentric connecting rod 6 and swings back and forth at a certain angle. The driving shaft of the eccentric connecting rod 6 is driven by a motor. A guiding push plate 41 is installed on the driving swing arm 4. The left end of the guiding push plate 41 is arc-shaped. A telescopic adjustable support rod 7 is provided at the force-receiving end of the transmission swing arm 3. A roller 8 is provided on the support rod 7. The roller 8 contacts the guiding push plate 41. A thimble 31 is provided at the impact end of the transmission swing arm 3. The end of the thimble 31 contacts the tail end of the thimble 2. The reset mechanism 5 drives the transmission swing to reset so that the thimble 31 moves away from the thimble 2.

[0017] A guiding cavity 32 for the telescopic movement of the support rod 7 is provided inside the transmission swing arm 3. The bottom of the guiding cavity 32 is connected with a rotatable adjusting bolt, and the adjusting bolt is in threaded transmission connection with the support rod 7. In this way, the telescopic movement of the support rod 7 can be adjusted by manually rotating the adjusting bolt, and then the position of the roller 8 can be adjusted. Of course, the adjusting bolt can also be driven by a servo motor for automatic adjustment.

[0018] The reset mechanism 5 includes a reset spring 51, a top shaft 52, and a sleeve 53. The reset spring 51 is placed inside the sleeve 53. A limiting plate is provided at one end of the top shaft 52 located inside the inner cavity of the sleeve 53. One end of the reset spring 51 abuts against the limiting plate. The end of the top shaft 52 located outside the sleeve 53 contacts the transmission swing arm 3. Through this structure, the top shaft 52 can always be pressed against the transmission swing arm 3 by the elastic force of the reset spring 51, ensuring that when in the initial position state, the impact end of the transmission swing arm is far away from the thimble position.

[0019] Adopting the above technical solution, the telescopic adjustment of the support rod 7 on the transmission swing arm 3 can change the distance between the roller 8 and the rotation center of the transmission swing arm 3. The swing amplitude of the driving swing arm 4 is certain. Therefore, as Figure 2 shown, the longer the distance that the roller 8 extends, the longer the sliding distance of the roller 8 along the guiding push plate 41 on the driving swing arm 4, and the smaller the swing amplitude of the impact end, so that the stroke of the thimble 2 becomes smaller. As Figure 4 shown, the shorter the distance that the roller 8 extends, the larger the swing amplitude of the impact end, so that the stroke of the thimble 2 becomes longer. In this way, the rear stroke can be adjusted to ensure the forming requirements of bar stocks of different specifications.

[0020] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0021] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rear stroke adjustment mechanism of a cold heading machine, comprising a die and a ejector rod. The ejector rod makes a reciprocating linear guiding telescopic motion aligned with the inner cavity of the die, and is characterized in that: It further includes a transmission swing arm, a driving swing arm and a reset mechanism. The driving swing arm is driven by an eccentric connecting rod and swings back and forth at a certain angle. A guiding push plate is installed on the driving swing arm. A telescopic and adjustable support rod is provided at the force-receiving end of the transmission swing arm. A roller is provided on the support rod, and the roller contacts the guiding push plate. A thimble is arranged at the impact end of the transmission swing arm, and the end of the thimble contacts the tail end of the ejector rod. The reset mechanism drives the transmission swing arm to reset, so that the thimble is away from the ejector rod.

2. The post-travel adjustment mechanism of the cold heading machine according to claim 1, characterized in that: A guiding cavity for the telescopic movement of the support rod is arranged inside the transmission swing arm. An adjustable bolt that can rotate is connected to the bottom of the guiding cavity, and the adjustable bolt is in threaded transmission connection with the support rod.

3. The post-travel adjustment mechanism of the cold heading machine according to claim 1, characterized in that: The reset mechanism includes a reset spring, a top shaft and a sleeve. The reset spring is placed inside the sleeve. A limiting plate is arranged at one end of the top shaft located inside the inner cavity of the sleeve. One end of the reset spring abuts against the limiting plate, and the end of the top shaft located outside the sleeve contacts the transmission swing arm.

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