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Four principles to be followed in selecting materials for metal stamping parts

1. Try to choose the appropriate specifications and sizes for the fixed length plate. After cutting from the steel mill, there is no need for secondary cutting to reduce cutting costs; For rolled plates, it is advisable to choose the specifications and process of the rolled plates formed by uncoiling to reduce the workload of secondary shearing and improve work efficiency.

2. The thickness of the board has deviation requirements, usually within the allowable deviation range. Board with smaller deviation should be preferred.

3. Determining the shape and size of the unfolded sheet metal for metal stamping parts is a prerequisite for analyzing the degree of deformation of stamping parts, designing manufacturability, and developing process specifications. If the shape of the sheet metal is appropriate, not only can the uneven distribution of deformation along the sheet metal be clearly improved, but also the forming limit can be increased, the height of the protrusions can be reduced, and the cutting margin can be reduced. In addition, for some parts that are directly formed after material cutting, if accurate sheet metal shapes and sizes can be provided, the number of trial molds and mold adjustments can be reduced, thereby shortening the production cycle and improving productivity.

4. When selecting materials for product design, avoid using high-grade materials that may result in excessive product performance. At the same time, while meeting product and process requirements, try to choose materials and thicknesses used in existing mass-produced vehicle models, form a material platform, and provide convenience for subsequent procurement and inventory management.

Five principles that should be followed in the processing technology of metal stamping parts

1. When high requirements are placed on the cross-sectional quality and dimensional accuracy of metal stamping parts, a trimming process can be added after the punching process or a precision punching process can be directly adopted.

2. The number of processes for bending parts mainly depends on the complexity of their structural shape, the number of bending angles, relative positions, and bending directions. When the bending radius of the bent part is less than the allowable value, an additional shaping process is added after bending.

3. The number of stretching processes is related to material properties, stretching height, number of stretching steps, drawing diameter, material thickness, and other conditions, which can only be determined through stretching process calculations. When the fillet radius of the stretched part is small or the dimensional accuracy requirement is high, an additional shaping process needs to be added after stretching.

4. In order to improve the stability of stamping processes, it is sometimes necessary to increase the number of processes to ensure the quality of stamped parts.

5. The cutting of metal stamping parts with punched shapes is completed by a single process mold. For complex shaped punched workpieces, due to the limited structure or strength of the mold, it is necessary to divide the inner and outer contours into several parts for punching and use multiple stamping processes. If necessary, continuous punching dies can be used. For metal stamping parts with high flatness requirements, an additional leveling process can be added after the punching process.