Material returning device of cylindrical part formed by horizontal press machine

Abstract

A material returning rod is a round long rod, the outer diameter of one end of the material returning rod is sleeved with a push rod, the material returning rod is sleeved with a spring, the other end of the spring is connected with one end of an opening pulling punch, the material returning rod is sleeved with the opening pulling punch, the opening pulling punch slides on the material returning rod along with compression and expansion of the spring, and the opening pulling punch is connected with the opening pulling punch. In the material returning process, the opening pulling punch is driven by stretching out and drawing back of the spring to apply force to the opening portion of the workpiece, the material returning movement is achieved by combining the pushing force applied to the surface of the inner bottom of the workpiece by the material returning head driven by the material returning rod, and then the smooth material returning purpose is achieved. The problem of unsmooth material returning of the cylindrical part formed by the horizontal press machine is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of press stamping and material returning and the field of part processing equipment, in particular to a material returning device for a cylindrical part of a press. BACKGROUND

[0002] With the continuous rise of the existing automation industry, under the premise of ensuring the quality of parts, the level of production efficiency is the most critical, and the forming and material returning equipment of cylindrical parts mostly uses a press, and the material returning methods of the press mostly adopt elastic unloading, rigid unloading, ejector rod ejection and the like.

[0003] When using a horizontal press to perform a cylindrical part forming process, in order to reduce tooling costs, the ejector rod ejection is mostly used for material returning, but in the actual operation process of the automatic equipment, the material returning rod ejection causes the material returning to be not smooth, or the mold can be scrapped, and the safety of the operator is threatened, which has great safety hazards.

[0004] In view of the problem of poor material returning in the necking and drawing process of the horizontal press thin-walled cylindrical part, the material returning device needs to be optimized, and under the premise of ensuring the necking and drawing process unchanged, the problem of poor material returning is solved. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides a material returning device for a cylindrical part formed by a horizontal press, when the cylindrical part is formed, the material returning head and the drawing punch simultaneously act on the inner bottom plane and the mouth of the workpiece, and the cylindrical part is pushed out and smoothly slides off the material returning head.

[0006] The technical scheme adopted by the present application to solve its technical problems is:

[0007] A material returning device for a cylindrical part formed by a horizontal press, comprising a push rod, an ejector rod, a drawing punch, a material returning head and a spring, the ejector rod is a circular long rod, the outer diameter of one end of the ejector rod is sleeved with the push rod, the inner wall of the push rod is threadedly connected with the ejector rod, the middle segment of the ejector rod is provided with a boss, the end of the boss away from the push rod is the a end, the a end is connected with the spring, the spring is sleeved on the ejector rod, one end of the spring is connected with the a end of the boss, the other end of the spring is connected with one end of the drawing punch, the spring is located between the a end of the boss and the drawing punch, the drawing punch is sleeved on the ejector rod, and the drawing punch slides on the ejector rod with the compression and relaxation of the spring, the boss and the drawing punch limit the spring, the other end of the drawing punch is provided with the material returning head, the outer diameter of the drawing punch is greater than the outer diameter of the material returning head, the material returning process relies on the extension and contraction of the spring to drive the drawing punch to apply force to the mouth of the workpiece, the push force applied to the inner bottom surface of the workpiece by the ejector rod driving the material returning head is combined to realize the material returning movement, and the smooth material returning purpose is achieved.

[0008] Preferably, when the spring is assembled to the material returning rod, the inner diameter of the spring is larger than the outer diameter of the material returning rod, and the gap between the spring and the material returning rod is less than 0.5 mm, so that the spring is well fitted to the material returning rod after assembly, and the compression and elongation of the spring are not affected.

[0009] Preferably, when the spring is assembled to the material returning rod, the spring has a supporting effect on the drawbead punch, the supporting force is related to the compression amount of the spring and the performance of the spring, and finally the installation position of the spring can support the drawbead punch to move along with the material returning rod without changing the position of the spring.

[0010] Preferably, when the spring is assembled to the material returning rod, when the material returning rod realizes the material returning action, the material returning rod and the material returning head enter the inside of the workpiece and abut against the inner bottom of the workpiece to realize material returning, and the drawbead punch moves in the opposite direction of the material returning direction under the constraint of the mouth part of the workpiece, at this time the spring is in a compressed state, and when the spring is compressed to the final position, the elastic force of the spring is less than or equal to the friction force of the drawbead punch entering the mouth part of the workpiece.

[0011] Preferably, the end part of the material returning head and the material returning rod are connected by threads, and the maximum diameter of the material returning head is less than the inner diameter of the mouth part of the workpiece after the workpiece is closed, and the material returning head can support the drawbead punch to smoothly realize the drawbead action.

[0012] Preferably, the maximum diameter of the material returning rod after the spring, the drawbead punch and the material returning head are installed is less than the inner diameter of the mouth part of the workpiece after the workpiece is closed, and the strength and rigidity requirements are met to ensure the strength requirements of the drawbead action and the material returning action.

[0013] Preferably, the length between the end surface a of the material returning rod supporting the spring and the threads for installing the material returning head is L, so as to accommodate the compressed spring and the drawbead punch, and the minimum length of L is greater than the compression limit length of the spring.

[0014] Preferably, the total length of the material returning rod meets the functional requirements of the drawbead action and the material returning action after the drawbead punch and the material returning head are installed.

[0015] The beneficial effects of the present application are that the material returning process relies on the expansion and contraction of the spring to drive the drawbead punch to apply force to the mouth part of the workpiece, and the thrust force applied to the inner bottom surface of the workpiece by the material returning rod and the material returning head together realize the material returning movement, and then achieve the purpose of smooth material returning. The drawbead punch and the material returning head and the spring used during material returning are installed on the material returning rod, and the push rod is controlled to move by the horizontal press. After the cylindrical part is formed, the push rod pushes the material returning rod to move forward, the material returning head abuts against the inner bottom of the workpiece to apply a thrust force, at this time the drawbead punch is clamped by the mouth part of the workpiece and cannot enter the inner cavity of the workpiece, the spring is in a compressed state, and the spring exerts an elastic force on the mouth part of the workpiece. Under the action of the thrust force and the elastic force of the spring, the workpiece smoothly slides off the material returning head, solving the problem of poor material returning of the horizontal press when forming the cylindrical part. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 This is a schematic diagram of the material unloading device of the present invention.

[0017] Figure 2 This is a schematic diagram of the tooling for the material ejection device of the present invention in a horizontal press.

[0018] Among them, 1-push rod, 2-ejector rod, 3-spring, 4-pull punch, 5-ejector head, 6-ejector rod, 7-mold a, 8-mold b, 9-mold c, 10-mold sleeve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In this embodiment, a material ejection device for forming cylindrical parts using a horizontal press is provided, such as... Figure 1 As shown, it includes a push rod 1, a ejector rod 2, a compression spring 3, a pull punch 4, and an ejector head 5. The ejection process relies on the extension and contraction of the spring to drive the pull punch to apply force to the opening of the workpiece, which, combined with the thrust applied by the ejector rod to the ejector head on the inner bottom surface of the workpiece, achieves the ejection movement.

[0021] When the cylindrical workpiece is near the mold cavity, such as Figure 2 As shown, the push rod 6 presses against the outer bottom plane of the workpiece and sends the workpiece into the mold cavity. It passes through the mold 9, mold 8 and mold 7 in sequence to close the opening. At the same time, when the opening of the workpiece is not completely deformed, the push rod 1 pushes the pull punch 4 and the ejector head 5 forward and smoothly enters the interior of the workpiece, but does not contact the inner bottom plane of the workpiece. At this time, the pull punch 4 and the ejector head 5 are in a close contact state, and the push rod 6 presses against the outer bottom plane of the workpiece to maintain stability and stays in a fixed position.

[0022] Subsequently, with the workpiece position remaining unchanged, the push rod 1 drives the pull punch 4 and the ejector head 5 to move backward. When they move backward to the workpiece opening, the pull punch 4 contacts the workpiece opening, and the ejector head 5 supports the pull punch 4 to straighten the opening of the workpiece after it is closed. Then the pull punch 4 and the ejector head 5 move backward to exit the mold sleeve 10. During this process, the pull punch 4 and the ejector head 5 are in a close contact state.

[0023] Subsequently, the ejector rod 6 moves backward, and the push rod 1 pushes the drawing punch 4 and the ejector head 5 forward again. Since the maximum diameter of the ejector head 5 is smaller than the inner diameter of the workpiece's drawing opening, the ejector head 5 smoothly enters the workpiece's interior, contacts the outer bottom plane, and applies a pushing force. At the same time, the drawing punch 4 remains at the workpiece's opening due to the frictional force at the opening. At this time, the spring 3 is in a compressed state, and the drawing punch 4 applies a pushing force in the same ejection direction at the workpiece's opening. Under the combined action of the two pushing forces, the purpose of smooth and rapid ejection of the workpiece is achieved.

[0024] The unloading device has been proven in practice and has solved the problem of poor unloading of cylindrical parts formed by horizontal presses in actual production.

Claims

1. A material removing device for forming a cylindrical workpiece by a horizontal press, comprising a push rod, a material removing rod, a mouth opening punch, a material removing head and a spring, characterized in that: the material removing device for forming a cylindrical workpiece by a horizontal press, the material removing rod is a circular long rod, the outer diameter of one end of the material removing rod is sleeved with the push rod, the inner wall of the push rod is threadedly connected with the material removing rod, the middle section of the material removing rod is provided with a boss, the end of the boss away from the push rod is an a end, the a end is connected with the spring, the spring is sleeved on the material removing rod, one end of the spring is connected with the a end of the boss, the other end of the spring is connected with one end of the mouth opening punch, the spring is located between the a end of the boss and the mouth opening punch, the mouth opening punch is sleeved on the material removing rod, and slides on the material removing rod along with the compression and relaxation of the spring, the boss and the mouth opening punch limit the spring, the other end of the mouth opening punch is provided with the material removing head, the outer diameter of the mouth opening punch is greater than the outer diameter of the material removing head, the material removing process relies on the expansion and contraction of the spring to drive the mouth opening punch to apply force to the mouth of the workpiece, the push force applied to the inner bottom surface of the workpiece by the material removing rod and the material removing head is combined to realize the material removing movement, and then the smooth material removing purpose is achieved.

2. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: when the spring is assembled to the material removing rod, the inner diameter of the spring is greater than the outer diameter of the material removing rod, and the gap between the spring and the material removing rod is less than 0.5 mm, so that the assembly is good in adhesion to the material removing rod and does not affect the compression and elongation of the spring.

3. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: when the spring is assembled to the material removing rod, the spring supports the mouth opening punch, the support force is related to the compression amount of the spring and the performance of the spring, and finally the installation position of the spring is such that the position of the spring does not change when the mouth opening punch moves along the material removing rod under no load.

4. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: when the spring is assembled to the material removing rod, when the material removing rod realizes the material removing action, the material removing rod and the material removing head enter the inside of the workpiece and abut against the inner bottom of the workpiece to realize the material removing, and the mouth opening punch moves in the opposite direction of the material removing direction under the constraint of the mouth of the workpiece, at this time, the spring is in the compressed state, and when the spring is compressed to the final position, the elastic force of the spring is less than or equal to the friction force of the mouth opening punch entering the mouth of the workpiece.

5. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: the material removing head is threadedly connected with the end of the material removing rod, the maximum diameter of the material removing head is less than the inner diameter of the mouth of the workpiece after the workpiece is closed, and the material removing head supports the mouth opening punch to realize the mouth opening smoothly.

6. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: the maximum diameter of the material removing rod after the spring, the mouth opening punch and the material removing head are installed is less than the inner diameter of the mouth of the workpiece after the workpiece is closed, and the strength and rigidity requirements are met to ensure the strength requirements of the mouth opening and the material removing action.

7. The material removing device for forming a cylindrical workpiece by a horizontal press according to claim 1, characterized in that: the length between the a end of the end surface of the material removing rod supporting the spring and the thread for installing the material removing head is L, so as to accommodate the compressed spring and the mouth opening punch, and the minimum length of L is greater than the compression limit length of the spring.

8. The material removal device of claim 1, wherein: The total length of the material removal rod satisfies the functional requirements of the pull opening action and the material removal action after the pull opening punch and the material removal head are installed.

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