Metal stamping parts, stamping processing will be affected by what factors
The processing of metal stamping parts requires the use of molds for processing. The molds used in the processing of metal stamping parts are generally specialized. Occasionally, a number of different parts require several sets of molds to be processed and formed, and the mold manufacturing has high precision and high skill requirements. It is a skill-intensive product. Therefore, only in the environment where the stamping parts are manufactured in large batches, the advantages of stamping processing can be fully reflected, so as to obtain better economic benefits.
There are a few safety questions about stamping. During the stamping process, a little noise and vibration will be generated, and the safety of the operator will be disturbed from time to time. However, these questions are not completely caused by the stamping process and the mold itself, but mainly because of the traditional stamping equipment and technical operations that have fallen behind. With the advancement of scientific tricks, especially the development of computer tricks, and with the progress of mechatronics tricks, these questions will inevitably be handled quickly and satisfactorily.
The other is high-strength steel stamping. Today’s high-strength steel and ultra-high-strength steel are very good at reducing the weight of vehicles, improving the collision strength and safety efficiency of vehicles, and thus become the focus of the development of automotive steel. However, with the improvement of sheet strength, the traditional cold stamping process simply produces a split phenomenon during the forming process, and it is impossible to express the processing requirements of high-strength steel plates. In an environment where the forming conditions cannot be met, the world is gradually delving into the hot stamping technique of ultra-high-strength steel plates.
This trick is a new process that summarizes forming, heat transfer, and structural phase transformation. It is mainly a process that uses the characteristics of high-temperature austenite to increase the plasticity of the sheet and decrease the yield strength and form through a mold. However, thermoforming requires deep research on process conditions, metal phase transitions, and CAE analysis techniques. Today, this technique is monopolized by foreign manufacturers and the domestic development is slow.
- (1) The one-sided square coordinate grid with rounded corners is fan-shaped by squares, and the other parts are not deformed or deformed very little.
- (2) In the deformation zone, the side grid is fan-shaped by squares; the outer side of the die is stretched tangentially by hand, and the length is extended; the inner side of the punch is compressed by tangential compression, and the length is shortened. From the inside and the surface to the center of the sheet, the degree of shortening and elongation gradually decreases. The layer of metal whose length is fixed before and after deformation between shortening and elongation becomes the neutral layer.
An example of a change in the cross section of the bending deformation zone occurred in the processing of Changzhou stamping parts, and it is necessary to investigate the change of the cross section after bending. We can find that:
The cross section of the sheet material in the deformation zone is deformed. After the inner material of the curved narrow plate is tangentially compressed, the width is moved to increase the width; after the outer material is tangentially stretched, the inconsistency of the material is supplemented by the width and thickness deviation, so that the width becomes narrower. For the processing of metal stamping parts, for wide plates with larger widths, because the width is biased toward the material, the resistance is large, the material is difficult to move toward the width, and the cross-sectional shape remains fixed and is still rectangular.
The thickness is reduced. When the sheet is bent, the inner layer is shortened by the tangential compression surface, and the thickness should be increased. However, because the punch presses the sheet tightly, the thickness increase resistance is very large, and the outer layer is stretched by tangential stretching, and the thickness tends to become thinner. Restricted. The increase in the total thickness is less than the decrease in the thickness, so that the phenomenon of thickness reduction occurs.
Ordinary bending parts belong to the wide plate bending, so the width of the plate before and after bending is biased towards the foundation to be fixed. If the bending radius of the bending part is r and the thickness of the bending sheet is t, compare the bending part with a smaller bending radius r/t, because the thickness of the sheet in the deformation zone is obviously thinner during bending. According to the criterion of fixed volume, it is bound to Will increase the length of the sheet.
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