High-precision upper mold demolding mechanism

Abstract

The invention discloses a high-precision upper mold demolding mechanism which comprises a mold shell main body and a punching rod, and is characterized in that the mold shell main body is provided with a central stepped hole, the punching rod is arranged in the central stepped hole in a close fit manner, the lower end of the punching rod extends out of the mold shell main body, and the top of the punching rod is provided with a limiting boss and a punching rod cushion block; a die shell middle pad is arranged at the upper end of the die shell body in a matched mode, the punching rod cushion block is pressed on the die shell middle pad, a central flat hole is correspondingly formed in the die shell middle pad, a push pin capable of moving up and down and two pull pins are arranged in the central flat hole in a matched mode, the two pull pins are arranged on the die shell body in a sliding and penetrating mode and arranged on the two sides of the punching rod respectively, and reset structures are arranged on the two pull pins respectively in a matched mode. The lower ends of the two pull pins are connected with a push block, the push block is slidably arranged at the lower end of the punching rod in a sleeving mode, a mold shell upper pad is arranged at the upper end of the mold shell middle pad in a matched mode, a center hole is formed in the mold shell upper pad, and an ejector rod cushion block is arranged in the center hole in an up-down moving mode and abuts against the push pins. The coaxiality and perpendicularity of inner holes of products are effectively guaranteed, and the precision of the products is improved.

Description

Technical Field

[0001] The present invention relates to an improved invention of a fastener forming die, and particularly to an improved invention of a high-precision upper die demoulding mechanism. Background Art

[0002] See the appendix Figure 3 , the traditional upper die demoulding mechanism includes a die shell a7, a punch rod a8, a push tube a6, three pins a3, a three-pin upper pad a5, a three-pin lower pad a4, a bush a2 and a top rod cushion block a1. Demoulding route: the top rod cushion block a1 moves, pushing the three pins a3 to move, pushing the push tube a6 to move, and the push tube a6 demoulds the product a9 at the head of the punch rod a8.

[0003] There are the following disadvantages: First, there is a sliding fit between the punch rod a8 and the push tube a6, and between the push tube a6 and the die shell a7, which requires a clearance fit, resulting in large fluctuations in the coaxiality and perpendicularity between the punch rod a8 and the inner hole of the product a9; Second, the way of demoulding by the mutual cooperation of the punch rod a8 and the push tube a6 leads to a demoulding distance of 54 mm, and the length of the punch rod a8 is 189 mm. The longer the length of the punch rod a8, the lower the stiffness of the workpiece, and thus the accuracy of the product a9 is also reduced. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-precision upper die demoulding mechanism.

[0005] To solve the above technical problem, the present invention is implemented by adopting the following technical solution: This kind of high-precision upper die demoulding mechanism includes a die shell main body and a punch rod. It is characterized in that: the die shell main body is provided with a central stepped hole, and a punch rod is tightly fitted in the central stepped hole. The lower end of the punch rod extends out of the die shell main body. A convex platform is provided at the top of the punch rod. The convex platform is in limit fit with the central stepped hole, and a punch rod cushion block abutting against the upper end of the convex platform is also provided in the central stepped hole; A die shell middle pad is arranged at the upper end of the die shell main body. The punch rod cushion block is pressed by the die shell middle pad. Correspondingly, the die shell middle pad is provided with a central flat hole, and a push pin that can move up and down and two pull pins driven by the push pin are arranged in the central flat hole. The two pull pins can slide through the die shell main body and are arranged on both sides of the punch rod. The two pull pins are respectively provided with a reset structure. The lower ends of the two pull pins are commonly connected with a push block. The push block can slide and sleeve on the lower end of the punch rod. A die shell upper pad is arranged at the upper end of the die shell middle pad. The die shell upper pad is provided with a central hole, and a top rod cushion block that can move up and down is arranged in the central hole. The top rod cushion block abuts against the push pin.

[0006] The reset structure is a spring. The spring is sleeved on the pull pin. The upper end of the spring is in step limit fit with the upper end of the pull pin, and the lower end of the spring is in limit fit with the die shell main body.

[0007] The lower end of the spring extends into the pull pin hole of the die shell main body and is in step limit fit with the step in the pull pin hole.

[0008] The pull pin and the push block are connected by bolts, and corresponding bolt holes are provided at the bottom of the pull pin and on the push block.

[0009] The beneficial effect of the present invention is an improved high-precision upper die demoulding mechanism. The punch rod is arranged in the die shell body in a tight fit manner, effectively ensuring the coaxiality and perpendicularity of the inner hole of the product. The push block and the punch rod cooperate with each other for demoulding. When the demoulding distance is 54 mm, the length of the punch rod is 133 mm. The short length of the punch rod can improve the stiffness of the workpiece and the precision of the product. Description of the Drawings

[0010] The following further details the specific embodiments of the present invention with reference to the drawings.

[0011] Figure 1 It is a schematic structural diagram of the present invention.

[0012] Figure 2 It is a mating diagram of the upper die and the lower die of the present invention.

[0013] Figure 3 It is a structural diagram of the traditional upper die demoulding mechanism in the background technology of the present invention. Specific Embodiments

[0014] The drawings show the structure of the present invention, and the following further describes its relevant details in conjunction with the drawings. In this embodiment, referring to the attached Figures 1-2 , the high-precision upper die demoulding mechanism includes a die shell body 1 and a punch rod 2. The die shell body 1 is provided with a central stepped hole 11. The punch rod 2 is tightly arranged in the central stepped hole 11. The lower end of the punch rod 2 extends out of the die shell body 1. A convex platform 21 is provided at the top of the punch rod 2. The convex platform 21 is in limit fit with the central stepped hole 11. A punch rod spacer � is further provided in the central stepped hole 11 and abuts against the upper end of the convex platform 21. A die shell middle pad 4 is arranged at the upper end of the die shell body 1. The punch rod spacer 3 is pressed against the die shell middle pad 4. The die shell middle pad 4 is provided with a central flat hole 41. The size of the central flat hole 41 is smaller than that of the punch rod spacer 3. A push pin 5 that can move up and down and two pull pins 6 driven by the push pin 5 are arranged in the central flat hole 41. The two pull pins 6 can slide through the die shell body 1 and are arranged on both sides of the punch rod 2. The two pull pins 6 are respectively provided with a reset structure 61. The lower ends of the two pull pins 6 are jointly connected to a push block 7. The push block 7 can slidably sleeve the lower end of the punch rod 2. A die shell upper pad 8 is arranged at the upper end of the die shell middle pad 4. A central hole 81 is provided in the die shell upper pad 8. A top rod spacer 9 that can move up and down is arranged in the central hole 81. The top rod spacer 9 abuts against the push pin 5.

[0015] The demolding route of the present invention: The ejector rod drives the ejector rod spacer 9 to move downward in the central hole 81 of the mold shell spacer 8, then the ejector rod spacer 9 pushes the ejector 5 to move downward in the flat hole of the mold shell spacer 4, then the ejector 5 pushes the draw pin 6 to move downward in the draw pin 6 hole of the mold shell body 1, and finally the draw pin 6 pushes the push block 7 to move downward. The push block 7 demolds the product at the head of the punch rod 2. Thus, the demolding process is completed. Since the ejector rod is fixedly arranged with the mold shell body 1 and there is no gap, the coaxiality and perpendicularity of the inner hole of the product are effectively guaranteed. At the same time, this demolding mechanism can shorten the length of the punch rod 2, improve the stiffness of the workpiece, and further improve the precision of the product.

[0016] As a specific implementation of a further improvement, the reset structure 61 is a spring. The spring is sleeved on the draw pin 6. The upper end of the spring is in step limit fit with the upper end of the draw pin 6, and the lower end of the spring is in limit fit with the mold shell body 1. Preferably, the lower end of the spring extends into the draw pin 6 hole of the mold shell body 1 and is in step limit fit with the step in the draw pin 6 hole, so that the spring has sufficient installation space to ensure the elastic force. Among them, the spring contracts when the draw pin 6 moves downward, and after demolding is completed, the draw pin 6 is moved upward to reset, so that the push block 7 is separated from the head of the punch rod 2, facilitating the head of the punch rod 2 to receive the next processed product.

[0017] As a specific implementation of a further improvement, the draw pin 6 and the push block 7 are connected by a bolt 62. Corresponding bolt holes are provided at the bottom of the draw pin 6 and on the push block 7, which is convenient for quick assembly and connection.

[0018] In summary, the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. High-precision upper die demoulding mechanism, including a die shell body and a punch rod, characterized in that: The die shell body is provided with a central stepped hole, in which a punching rod is tightly fitted. The lower end of the punching rod extends out of the die shell body. A convex platform is provided at the top of the punching rod, and the convex platform is in limit fit with the central stepped hole. Moreover, a punching rod spacer block that abuts against the upper end of the convex platform is also provided in the central stepped hole. A die shell middle pad is arranged at the upper end of the die shell body. The punching rod spacer block is pressed against the die shell middle pad. Correspondingly, the die shell middle pad is provided with a central flat hole, in which a push pin that can move up and down and two pull pins driven by the push pin are arranged. The two pull pins can slide through the die shell body and are respectively arranged on both sides of the punching rod. The two pull pins are respectively provided with a reset structure. The lower ends of the two pull pins are jointly connected with a push block. The push block can be slidably sleeved on the lower end of the punching rod. A die shell upper pad is arranged at the upper end of the die shell middle pad. The die shell upper pad is provided with a central hole, in which a top rod spacer block that can move up and down is arranged. The top rod spacer block abuts against the push pin.

2. The high-precision upper die demolding mechanism according to claim 1, wherein: The reset structure is a spring. The spring is sleeved on the pull pin. The upper end of the spring is in stepped limit fit with the upper end of the pull pin, and the lower end of the spring is in limit fit with the die shell body.

3. The high-precision upper die demolding mechanism according to claim 2, characterized in that: The lower end of the spring extends into the pull pin hole of the die shell body and is in stepped limit fit with the step in the pull pin hole.

4. The high-precision upper die demolding mechanism according to claim 1, characterized in that: The pull pin and the push block are connected by bolts. Correspondingly, bolt holes are provided at the bottom of the pull pin and on the push block.

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