When stamping out high-quality precision stamping heads, several aspects that cannot be ignored 'hardware'

Precision stamping heads are important components on pressure vessels such as boilers, oil refining and chemical equipment. According to their shape, precision stamping parts heads can be divided into flat-bottomed precision stamping parts heads, dish-shaped precision stamping parts heads, elliptical precision stamping parts heads and spherical precision stamping parts heads, and sometimes arched precision stamping parts are used. Head. There are several aspects that can not be ignored when stamping high-quality precision stamping heads: 1. Precision stamping heads cannot ignore wall thickness changes. Precision stamping heads are generally formed by thick plate stamping, because the material is in the forming process. The stress and strain state of each part is different, so that the wall thickness of each part of the precision stamping head after stamping is not the same. Therefore, the thickness change of the precision stamping head cannot be ignored in the forming of the precision stamping head. The main factors affecting the wall thickness of the head of precision stamping parts are the mechanical properties of the forming material, the degree of deformation and the structure of the stamping die. The lower the material strength, the greater the reduction in wall thickness; the greater the degree of deformation and the smaller the mold gap and die fillet, the greater the reduction in wall thickness; the poor lubrication of the mold will increase the reduction in thickness. 2. The gap of the stamping forming die of the precision stamping head can not be too small. During the deep drawing and forming process of the precision stamping head, the straight side thickens sharply, especially when the length of the straight side is more than 100mm, the thickening is more serious. The thickening rate can reach more than 10%. Therefore, the gap of the forming die of the precision stamping head should not be too small, it should be greater than 10% of the material thickness, otherwise, the material cannot pass through the die gap, the bottom of the workpiece is seriously thinned and broken, but the die gap is too large, and the die fillet is too large. , It will reduce the blanking effect and cause wrinkles on the upper part of the precision stamping head. Therefore, the gap of the stamping forming die for the head of the precision stamping part should be selected reasonably. 3. When the relative wall thickness of the precision stamping parts is small, the general drawing method cannot be used for the forming of the head of the precision stamping. For the forming parts of the precision stamping part with a small relative wall thickness, the general drawing method cannot be used to form, otherwise bulges and wrinkles will occur. Tucked or pulled off. Multiple deep drawing methods can be used to reduce the degree of deformation to prevent thinning and tearing; deep drawing with deep drawing ribs to increase the radial tensile stress of the blank and improve the blank holder effect to prevent wrinkles; or use a tapered blank holder and cone The method of deep drawing with a concave die is used to improve the flow conditions and deformation of the blank and prevent it from breaking. 4. Cold shaping of thick plate of melon petals cannot be ignored. Thick plate parts of melon petals are generally formed by hot stamping. Because the shrinkage rate of hot compression is difficult to control, it is generally not considered when designing the mold. Instead, cold calibration is performed after forming to ensure the accuracy of its shape and size. Therefore, cold calibration cannot be ignored in the forming of melon petals thick plates. . 5. Ball and belt workpieces are not suitable for thick plate forming. Flat blanks. Ball and belt workpieces are generally spherical containers with large diameters (such as spherical shells with a diameter of 15700 mm, flight cabins, etc.), which can only be stamped with thick plates in the manufacturing plant. The petals are then shipped to the site and assembled and welded into a whole. The forming process of the ball can be divided into two types: hot pressing and cold pressing. The quality of hot-pressed parts is poor and needs to be heated, but the forming force is small, and the material is not hardened during the forming process; the quality of cold-formed balls is good, but the forming force is large, and a larger tonnage press is required. When the diameter of the sphere is small and the batch of the workpiece is large, the integral stamping can be used, so that the production batch can not be ensured, and the welding process can be reduced to ensure the forming accuracy of the workpiece. In order to ensure the quality of the workpiece and prevent wrinkling, flat blanks should not be used for the forming of ball and belt workpieces. They should be rolled into conical blanks and then formed by hot pressing in the mold.