‌What are the differences between screw punches and screw secondary punches?

The difference between screw punches and screw secondary punches mainly lies in their uses and functions. ‌

1. Uses and functions

Screw punches are mainly used for the initial forming of screws. Usually in the manufacturing process of screws, the punch will punch the metal material into a preliminary shape. The function of the screw punch is to punch the wire or disk into the head shape of the screw, such as a hexagonal head or a flat head.

‌Screw secondary punches are used in the subsequent process of screw manufacturing, mainly for further processing and correction of the screws that have been initially formed. For example, the threads of the screws are finely processed to ensure the accuracy and smoothness of the threads.

2. Structure and materials

Screw punches are usually made of high-hardness materials, such as high-speed steel or cemented carbide, to ensure their wear resistance and durability. The shape and size of the punch need to be designed and manufactured according to the specific screw specifications.

The ‌Screw secondary punch‌ is similar to the screw punch in material and hardness, but its design pays more attention to detail processing to ensure the accuracy and surface quality of the thread.

3. Manufacturing process and application scenarios

In the manufacturing process, the ‌Screw punch‌ is usually used in combination with the cold heading process, and the wire or disc is punched into a preliminary shape by a cold heading machine. The cold heading process is suitable for a variety of metal materials, including carbon steel, alloy steel, stainless steel, etc. ‌Screw secondary punch‌ is used in the process after cold heading, and the screw is finely processed by subsequent processes such as machining or electroplating. The function of the secondary punch is to ensure the accuracy and surface quality of the thread, which is suitable for mass production and high quality requirements.