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Matters needing attention in bending processing of precision metal stamping parts
The bending of precision metal stamping parts is a processing method in which a bending moment is applied to the material to deform it, so that the precision stamping component is internally subjected to the bending stress of the bending moment. The stress distribution is limited by the neutral surface of the sheet.
Bending is a processing method in which a bending moment is applied to the material to deform it, so that the precision stamping component is internally subjected to the bending stress of the bending moment. The stress distribution is limited by the neutral surface of the sheet. The outside is tensile stress, and the inside is compressive stress. Once the bending moment is removed, the material returns to a state where the moment is balanced by elastic deformation. Compared with the standard shape of the workpiece, there is a certain phenomenon of flaring outward or tilting inward. This phenomenon is called elastic recovery and deformation.
The factors that affect the rebound of precision metal stamping parts are: part material, plate thickness, stamping pressure, die size and star shape. Because of these factors, if we consider the speed of sound and the nature of the rebound, it is easy to find the cause of the rebound phenomenon and then stop it. The root cause of springback is that the bent part is subjected to uneven stress after the material is bent. If this part of uneven stress becomes uniform stress, that is, compressive stress or tensile stress is applied to the entire part, the amount of springback can be reduced. However, some parts have special requirements for deformation, such as indentation, which requires considerable solutions in the design and processing of precision stamping parts.
The number of stamping processes mainly depends on the dimensional accuracy of the workpiece geometry and the material characteristics and complexity. In specific circumstances, the actual ability to manufacture molds should also be considered. , Stamping equipment conditions, production batches and process stability and other factors. On the premise of ensuring the quality of precision stamping parts, in order to improve economic efficiency and production efficiency, the number of processes should be as small as possible.
The number of stamping processes mainly depends on the dimensional accuracy of the workpiece geometry and the material characteristics and complexity. In specific circumstances, the actual ability to manufacture molds should also be considered. , Stamping equipment conditions, production batches and process stability and other factors. On the premise of ensuring the quality of precision stamping parts, in order to improve economic efficiency and production efficiency, the number of processes should be as small as possible. Principles that should be paid attention to in the processing technology of precision stamping parts:
Precision metal stamping parts When the cross-section quality and dimensional accuracy of the workpiece are required to be high, it is possible to consider adding a trimming process after the stamping process or directly using a precision stamping process.
The number of steps of a curved member mainly depends on the complexity of its structural shape, the number of bending angles, the relative position and the bending direction. When the bending radius of the bending member is less than the allowable value, a forming process is added after the bending. The process quantity and material properties of drawing parts, drawing height, number of drawing steps and drawing diameter, material thickness and conditions are related, and must be determined by the drawing process.
When the depth of the fillet is small or the dimensional accuracy is high, a forming process is required after stretching.
Determining the number of processes should also conform to the company's existing forming capabilities and the status of stamping equipment. The molding capacity should be able to ensure correspondingly improved assembly accuracy. Otherwise, you can only increase the number of operations.
Precision metal stamping parts In order to improve the stability of the stamping process, sometimes it is necessary to increase the number of processes to ensure the quality of the stamping parts. For example, the additional positioning process of the bending part of the hole punching, the increased deformation during the forming process reduces the punching of the hole to transfer the deformed area, and so on.
Precision metal stamping parts use a single process die to punch out a simple workpiece. When stamping a workpiece with a complex shape, due to the limited structure or strength of the mold, the inner and outer contours should be divided into several parts, and multiple stamping processes are required. If necessary, continuous mode can be used. For workpieces with higher flatness requirements, a leveling process can be added after the punching process.