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Hardware stretching partsWhat is the reason for the occurrence of mold clip material during processing? During the processing of stamping parts, the edge sequence mold is usually repaired, and it is easy to encounter the phenomenon of material being stuck in the upper mold during the debugging stage. The main reason for metal stretching parts is:

1. The core cannot be used for pressing and material return: the core is subjected to uneven force, there are gaps in the guide, and it is stuck without material return;

2. Insufficient core pressing force after trimming;

3. The deformed parts after trimming are stuck in the core.

The improvement and preventive measures for edge trimming and material jamming are as follows:

1. Solve the problem

(1) For the situation where the pressure core is stuck and cannot be returned normally due to uneven force and improper guidance of the pressure core, the gap between the guide plate and the sliding surface of the guide plate can be adjusted.

(2) The arrangement of springs and the replacement of spring specifications ensure even force distribution.

(3) Core guiding: Guiding the core is mainly to ensure the gap between the core and the concave die edge, with a general value of 0.5mm.

(4) Core pressing stroke: The core pressing stroke requires the core to pre press the part before the cutting edge; Cutting before pressing the parts can easily cause deformation, trimming, tearing, and jamming of the parts. Before the concave die comes into contact with the stamped part, the pre pressing stroke of the core is greater than or equal to 10mm.

2. Solve the problem

(1) The material return force varies with the thickness and shape of the board, usually 4-20% of the punching force.

(2) When processing stamping parts and trimming molds with vertical cutting, it is necessary to increase the material return force.

(3) The optimal choice for springs is to arrange them near the working area; For those who do not require high material return force, polyurethane or other materials can be used to provide material return force.

(4) Calculation of force. Spring pressure F=kL, k is related to the cross-sectional shape, inner and outer diameter dimensions, and material properties of the spring steel, where L is the amount of deformation; The pressure of nitrogen gas springs varies almost linearly, with advantages such as no need for pre tension, high initial pressure, small space occupation, long service life, and a response frequency of over 40 times per minute.