The First Punch Die, also called the upper punch or the first punch, is a mold required for the initial forming of the screw head. It is very important for the stability of the quality and the use value of the finished product during the screw manufacturing process. The first punch is commonly used on a two-stroke single-station automatic machine or a multi-station automatic machine to form a set of conical metal in a die and to pre-fill it before the head of the workpiece is formed. Material:During operation, the Hardmetal Punch are subjected to high power loads. Therefore, Header Punch for cold heading processes can be in full carbide or carbide tipped version. In most cases, it is made of a tungsten carbide core with a high-strength steel case, which has certain mechanical properties that contribute to an increase in resistance, with no coating on the surface.
Tungsten Carbide Punch Dies:
Carbide-Tipped First Punch:
Material for Dies and Punches for Metal Forming:
Material for Casing of First Punch:
The second punch for a cold heading machine is a critical tool used for the final shaping and forming of metal fasteners, such as bolts, screws, and rivets. It is designed to work in tandem with the first punch and die to achieve a desired end product. Second punchare widely used in the marking, stamping and extrusion of screw head slots, screws, self-tapping threads and other materials in the hardware industry. This slot is used to transmit torque and head efficiently. There are now many types of slots used and besides the traditional types like cross PH/PZ/or straight (slot) other types are becoming more and more popular: three-wing, four-wing, hex socket and many others. Material: The screw second punch is typically made from high-speed steel (HSS), two grades: SKH9 and M42. The choice of material will depend on the specific application and the requirements for durability, toughness, and wear resistance. SKH9 is used for iron steel, carbon steel or other common steels. M42 is used for stainless steel.
Surface Treatment: To improve the wear resistance and extend the lifespan of the second punch, it may be treated with surface coatings such as TiN with black or gold, TiAlN. These coatings help to reduce friction and wear, and can also enhance the performance and quality of the finished product. When ordering second punch for screw head please specify the following:
- Workpiece material (carbon or stainless steel, or others.)
- Type of fastener’s head, standardized (JIS, JCIS, ANSI, DIN, ISO, etc.)
- The outer diameter and length of the Screw Header Punch D × L.
- Coating of punch working part (TiN gold or black, No coating…)
Characteristics and properties of Second Punch with Coated: