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What are The Reasons For Cracking And Deformation of Metal Stamping Parts

Why do metal stamping parts crack and deform?

Friends who make metal stamping parts have all seen cases where metal stamping parts crack and deform due to process errors or poor material quality. Why do metal stamping parts eventually crack and deform?

There are many reasons for cracking and deformation of metal stamping parts, mainly including the following reasons.

1.Defects in the mold design for flange formation.

This mold is a mold for the left and right cavity parts. Due to the process content of the mold, in addition to the flange, it also has mold forming content. In addition, the special complexity of the parts, narrow bending surfaces, and forming requirements for concave mold core and forming surface, result in a large forming stroke and small pressing surface area under the mold structure conditions.

2.Unknown molding process parameters

In the process of forming parts, the process requires that the concave die, the pressing core, and the two parts must be tightly adhered together. When the machine slide descends, the pressing plate undergoes plastic deformation to achieve forming. At this stage, the processing technicians did not apply pressure to the machine in a timely manner according to the process requirements, or did not communicate with each other about the stable pressure information of the machine when transmitting each layer, resulting in unstable quality of the parts.

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3.Mold processing parts and drawing design errors

So, there are clear markings in the processing area of the salesperson. However, due to the complex surface of the molded core, it is machined on the guide surface after the casting is formed, resulting in a backlash error when the machined surface of the concave mold and the guide surface are pushed together. During normal operation of the mold, the molded core swings left/right.

Before the part is formed, positioning relies on the positioning pins and holes at the top of the core, which requires the core to be stable, reliable, and guided correctly during forming. Otherwise, the parts will become unstable during the forming process, causing the core to collide with the concave die wall and be crushed, resulting in tensile stress on the parts and causing cracks and tilting when the material strength limit is exceeded.

The main reasons for cracking and deformation of metal stamping parts are the above three aspects. In addition, there are many other factors that affect metal stamping parts