Surface Accuracy Flaws of Stamped Parts and Elimination Method
Stamping is a mass production process that cuts, bends, draws and punches different kinds of materials into sheet metal parts and components. Its application in the manufacturing of sheet metal parts and components has low manufacturing cost, high efficiency and high production speed. In the process of stamping, due to the complexity of its working principle and the influence of various factors, nonconforming physical deformations, such as warping or surface accuracy flaws, may occur on the surface of the stamped parts, which requires further treatment and elimination. This paper will firstly describe the possible causes of the surface accuracy flaws of stamped parts, and then analyze the methods for eliminating the surface accuracy flaws of stamped parts.
The surface accuracy flaws of stamped parts can be mainly caused by two factors, internal factors and external factors. Among the internal factors, sharp edges of the punches and dies and oil stains on the surfaces of the punches and dies will affect the surface accuracy of the stamped parts. The oil stains on the surfaces of the punches and dies will cause the oil film to stick to the metal surfaces of the parts when stamping, leading to quality defects. In addition, improper adjustments in position and angle will also lead to surface accuracy flaws of stamped parts. For example, when the slider did not return to a fixed position after forming, or when the punch and die were not at a right angle, the quality of the stamped parts would be affected.
External factors refer to environmental and operational factors. These include air conditions such as temperature and humidity, and operational factors such as the speed and force of the machine, the amount of oil on the parts and the accuracy of the operator’s positioning. When the temperature is too high, the viscosity of the oil on the parts will decrease, and the internal friction between the punch and die will increase, leading to surface accuracy flaws of the stamped parts. Moreover, when the speed of the machine is too high or the operating force is too large, it will easily cause surface accuracy flaws.
To eliminate the surface accuracy flaws of stamped parts, we must first find the causes and take corresponding countermeasures. At the same time, maintaining the cleanness of the punches and dies and the working environment will also help to reduce the generation of surface accuracy flaws. In addition, the angle and position of the punch and die should be adjusted correctly, and the machine speed and force should be appropriate.
In conclusion, surface accuracy flaws of stamped parts may be caused by internal or external factors, and the corresponding countermeasures should be taken according to the causes. By eliminating the surface accuracy flaws, not only can the stamped parts meet quality requirements, but also their performance and service life can be improved.
