In order to meet the requirements of various industrial enterprises on the shape and shape accuracy of the food conveyor line equipment chain plate, the shape of the chain plate of the toothed chain can be completed by CNC milling, mold milling or precision blanking in the manufacturing process. However, compared with the three methods of manufacturing, CNC milling and mold-making, not only the production efficiency is low, but also the production cost is relatively high; although the fine punch can be completed after a fine punch, but the production is produced. The cost ratio is very high. Although these three methods can meet the requirements of product quality, but they can not achieve the requirements of high production efficiency and low manufacturing cost, so these three processing techniques are not desirable, and must be more advanced. Process method. When making the toothed chain of the processed food conveying line, the linear tooth edge of the rack knife cuts out the involute tooth profile, and the top edge of the blade cuts the root circle. The position at which the top of the blade is in mesh with the tangent point of the linear tooth edge and the starting point of the root curve is called the transition point. When the absolute value of the negative displacement coefficient becomes larger and larger, that is, when the rack tool is getting closer to the center of the wheel blank, the transition point will be closer to the base circle until the transition point falls on the base circle to the extreme position. When the amount of negative displacement is larger and exceeds the limit position, the root curve can no longer be tangent to the involute and become intersected. At this time, the root portion is cut out of a notch, and the involutes on both sides of the root are cut off. This phenomenon is called undercutting. If the base circle of the machined sprocket is reduced, that is, the number of sprocket teeth is reduced, or the distance between the rack tool and the center of the sprocket becomes smaller until the rack knife exceeds the limit position, undercutting occurs. Since the blanking, broaching and refurbishing two sets of die punching are CNC milling, die milling and fine punching, they are not suitable for tooth shape and chainless shape processing. It can be completed by blanking and broaching two sets of molds. It is to design and manufacture one set of mold blanking, and another set of broaching mold to broach the blanked workpiece. The use of blanking and broaching two sets of molds for production and processing requires only ordinary presses, and the production process can better meet the requirements of the shape and shape accuracy of the toothed chain, and the toothed chain The production efficiency is also relatively high. However, the food conveyor line toothed chain still needs two processes to complete. If it can be completed on a common press with one process, it will have higher production efficiency and make the manufacturing cost less. The punching and finishing repairing die-cutting has been applied in the processing of workpieces with complex shapes and high precision requirements. It has achieved the requirements of high production efficiency and low manufacturing cost. The punching and finishing of the clamping will combine punching and refurbishing two sets of molds. Into a set of composite molds, the blanking and finishing process is completed simultaneously on a common press.