1. The radius of curvature of the punch. In the process of hardware processing, the amount of springback increases with the increase of the radius of curvature, and decreases with the decrease of the radius of curvature. Although different raw materials are slightly different, the thickness of the plate is generally lower than that of the plate. The small radius of curvature of the bent plate must be considered. Stainless steel hardware processing

2. The fillet radius of the die shoulder is too small; if the fillet of the shoulder is too large, it will spread out, and if it is small, it will tilt inward. Usually 2-4 times the thickness of the sheet.

3. The droop clearance of the punch. When the punch gap is thicker than the plate, the plate does not adhere well to the punch. The larger the fillet radius, the greater the springback; on the contrary, when the gap is too large, the springback almost disappears, but tilts inward. The general gap of metal stamping parts is 0.02o 0.05mm smaller than the plate thickness.

Fourth, the depth of bending. The inner diameter and outer diameter of the bend increase, and the outer diameter decreases as the inner diameter increases. The bending depth of ordinary metal stamping parts should be more than 4 times the thickness of the plate.

In precision parts processing plants, CNC lathe processing can not only complete the shaft and disc sleeve parts that can be processed by ordinary lathes, but also process a variety of complex rotating parts, such as complex curved surfaces; it can process a variety of pitches and even variable pitches. Thread. CNC lathes are usually used for high-precision, mass-produced parts; a variety of complex shaft and disc sleeve parts. Small private companies that focus on turning processing usually do not have machining centers. The positioning pin holes with high position accuracy requirements are technical difficulties in the processing and production process. At this time, if the current CNC lathe is used to process workpieces that exceed its processing range, Aiming at reducing production costs and increasing the utilization rate of equipment, it is of great practical significance for small businesses.

      In small private companies that mainly focus on turning processing, there is usually no machining center. For positioning pin holes that require high position accuracy, it is a technical difficulty in the processing and production process. This article is based on the traditional positioning pin hole processing method, using high-precision fixtures, bent slab tires and its drilling template, combined with CNC lathe processing methods, successfully realized the use of CNC lathe to process the two positioning pins of the left housing of the differential. The high-quality machining of the holes provides technical guidance for small companies without a CNC center.