Press Mold Stripping Structure for Reliable Punch Return
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Solution Overview
Problem
Conventional cam units for press molds face issues with high frictional resistance and elasticity, leading to inefficient punching operations, potential breakage, and reduced service life due to high-tensile steel panels and increased panel thickness, as well as difficulties in mounting and replacing return springs.
Innovation Solution
A stripping device with disc springs and a housing structure that includes a push member and elastic member, allowing for controlled movement and easy replacement, is designed to improve the separation of the punch from the panel and enhance the efficiency of the punching operation by using a push member that is compressed and then returns to separate the panel from the punch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a return spring with high elasticity is used to return the cam slider, then the returning movement of the punch is improved, but it is difficult to mount and hold the return spring and the cam unit is separated due to high elasticity during operation
Solution Approach 1:
The return spring is divided into multiple disc springs stacked together. Each disc spring can be individually mounted and held by retaining rings, making the assembly and disassembly process much easier while maintaining the required elastic force for reliable punch return movement.
Solution Approach 2:
Retaining rings are introduced as intermediary components to hold the disc springs in place. These retaining rings prevent the disc springs from separating during operation while allowing easy installation and removal, solving the mounting difficulty issue.
2Power
If the cam slider is moved forward at the moment of collision with high elasticity return spring, then the punching operation is performed, but the cam slider cannot be smoothly moved forwards due to high elasticity, increasing impulsive force and accelerating wear
Solution Approach 1:
The disc springs provide gradual elastic deformation before the punching operation, cushioning the impact and reducing impulsive forces. This gradual energy release prevents sudden collisions and reduces wear on contact surfaces, extending the service life of the cam device while maintaining sufficient punching power.
3Device complexity
If conventional return spring is used, then the structure is simple, but frictional resistance increases with high-tensile steel panels and increased panel thickness, causing punch return problems and potential breakage
Solution Approach 1:
Multiple disc springs are stacked together to form a composite elastic structure. This composite structure provides greater and more controllable elastic force to overcome the increased frictional resistance from high-tensile steel panels and thicker panels, ensuring reliable punch return movement while maintaining structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient return of the cam slider and punch, preventing panel lift and facilitating easy replacement of worn parts, thereby improving productivity and extending the service life of the cam device by using disc springs with controlled tensile strength and a stable stacked structure.
Implementation Method 1
a housing (30), which is provided therein with an elastic member (50) and a push member (70), is fixedly mounted on a front surface of the punch holder (10) such that the push member (70) is compressed against restoring force when contacting an object to be punched
Data Source
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AI summary
The present invention relates to a stripping device for a press mold and, more specifically, the objective of the present invention is to enable work productivity and efficiency to be improved by improving the structure of the stripping device for preventing a panel from being lifted up together by separating a punch and the panel when the punch retracts after punching during a punching operation using the punch in the press mold. The present invention relates to the stripping device (100), which has a punch holder (10) mounted at the front of an upper die or a cam slider (3) of the press mold and including the punch (16), and has a housing (30) fixedly mounted at the front surface of the punch holder (10) and having an elastic member (50) and a press member (70) provided therein, thereby being compressed with a restoring elastic force while the press member (70) comes in contact with an object to be punched. The stripping device (100) comprises: the housing (30) having a press member moving part (31) and an elastic member accommodating part (35) which are continuously formed from one side thereof toward the other side thereof along a cylindrical inner diametral surface, and having a support part (39) formed to protrude from an outer diametral surface of the other side thereof and having a fixing hole (39a) so as to be bolt-coupled and fixed to the front surface of the punch holder (10); a moving plate (40) inserted into the elastic member accommodating part (35) from the other side of the housing (30) and caught by a stepped portion from the press member moving part (31), and having a hole, through which the punch (16) passes, formed at the center thereof; the elastic member (50) having a hole, through which the punch (16) passes, formed at the center thereof and inserted into the elastic member accommodating part (35) so as to allow the moving plate (40) to be compressed while moving along the elastic member accommodating part (35); a fixed plate (60) having a hole, through which the punch (16) passes, formed at the center thereof, and fitted into the inner diametral surface of the elastic member accommodating part (35) opened at the other side of the housing (30), and then press-fitted and assembled to the front end of the other side of the housing (30) and coupled thereto; the press member (70) having a guide part (71) provided at the other side thereof and slidably inserted into the press member moving part (31) from one side of the housing (30) so as to come in contact with the moving plate (40), having a withdrawing part (72) having a diameter smaller than that of the guide part (71) and continuously formed to protrude from one side thereof, and having a longitudinal pin passing hole (73), through which the punch (16) moves, formed at the center thereof; and a fixing ring (80) detachably fitted into a ring fitting groove (32) formed at the front end at one side of the inner diametral surface of the press member moving part (31) so as to restrict the guide part (71) of the press member (70) from moving in one direction.