Analysis of Flanging Precision Realized by Ordinary Steel Die
Flanging is a kind of pressure processing technology widely used in various industries in mechanical parts manufacturing, stamping parts and cold work die. The precision of flanging affects the overall technological level of parts processing, so that it can meet the mechanical index requirements or even technical performance requirements of the designed parts.
At present, the common material of the die used in flanging process is ordinary steel, while using die forging or die casting mold to make flanging dies and punching dies, the steel die is used most widely. In the steel die, because of its low cost, it is widely used in mass production of mechanical parts, such as vehicle parts and parts in the mold industry.
Generally, in the die stamping process, the more precise the shape size of the die punch and the die, the higher the flanging precision. Therefore, the shape size of the die punch and the die is the key factor for realizing the flanging precision. Firstly, the flanging precision depends on the surface roughness and shape size precision of the die punch and the die, and the size deviation of its joint surface with the die punch and the die. Secondly, it is related to the material, heat treatment and mold manufacturing of the die.
In the process of the die directly machining, improving the surface quality and shape size precision of the steel die can be realized by using advanced equipment and processes, such as milling machine and grinding machine, etc. In addition, quenching and tempering processing of steel die can also increase the hardness and wear resistance of the steel die.
In the flanging process, the flanging precision of ordinary steel die is affected by the following factors: stamping clearance and assembly accuracy, material conditions of die, force and deformation of opening filling, slide clearance and temperature of the die.
The first factor is stamping clearance and assembly accuracy. The error of stamping clearance and assembly accuracy will directly affect the shape size and tolerance accuracy of the part after flanging. The design clearance of the punch and the die must be appropriate, which not only affects the flanging force, but also affects the accuracy and quality of the part after flanging.
The second factor is the material conditions of the die. The better the material conditions of the die, the higher the temperature resistance, wear resistance and impact toughness of the die, and the better the flanging accuracy and forming quality of the parts.
The third factor is the force and deformation during the opening and filling. The difference between the forming force of the parts and the opening filling force will directly affect the integrity of the formed parts. Therefore, the amount of charging gap should be moderate, and the difference between them should be minimized. In addition, the force and deformation of the forming parts should be uniform, otherwise, the forming quality of the parts will be affected.
The fourth factor is the slide clearance and temperature of the die. The die temperature must be kept stable and suitable. The slide clearance of the die should be appropriate and uniform, in order to reduce the deviation of the parts after flanging.
To sum up, to realize the flanging precision of ordinary steel die, on the one hand, the surface roughness and shape size precision of the die punch and the die must be improved, and the heat treatment of the steel die must be strengthened; on the other hand, the stamping clearance and assembly accuracy must be appropriate, the material conditions of the die must be improved, the force and deformation of opening filling must be uniform, and the slide clearance and temperature of the die must be appropriate. In this way, the accuracy of flanging can be effectively improved.
