Multi-station Bolt Forming Machine

• Mold Structure and Process Quantity

- The three-die and three-punch cold heading machine has three molds and conducts three punching processes in sequence. Generally, it first performs upsetting, then pre-forming, and finally forming. On the other hand, the four-die and four-punch cold heading machine has four molds and undergoes four punching processes. With one more punching process than the three-die and three-punch machine, it can perform more detailed processing on the product, having an advantage in forming complex-shaped heads or handling special treatments on the shank, for example.

• Product Forming Capability

- The three-die and three-punch cold heading machine is mainly used to produce products with relatively simple shapes and slightly lower precision requirements. For instance, common hexagon head bolts and other fasteners with regular shapes and not overly complex structures. The four-die and four-punch cold heading machine is capable of producing products with complex shapes and high precision requirements, such as parts with special head shapes (such as those with recesses, protrusions and other complex structures) or those requiring special processing on the shank (such as knurling).

• Difference in Production Efficiency

- When producing some simple products, the production speed of the three-die and three-punch cold heading machine may be similar to that of the four-die and four-punch machine. However, for complex products, the efficiency of the four-die and four-punch machine is higher. Because its multiple processes can better allocate processing tasks, reducing the processing burden on individual molds, thus enabling the production of more products that meet the requirements of complex shapes within a unit of time.

• Cost and Application Range

- The cost of the three-die and three-punch equipment is relatively low, and its occupied area may also be smaller. It is suitable for small and medium-sized enterprises to produce ordinary standard parts, and the application scenarios of the products are mainly in the fields of general mechanical connections where the shape precision requirements are not extremely high. The four-die and four-punch equipment usually has a higher price and may occupy a larger area. It is applicable to industries with high requirements for product quality and shape precision, such as the automotive, aerospace and other high-end manufacturing industries, for producing complex parts such as fasteners for key parts.