The difference between cold heading and hot forging
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The difference between cold heading and hot forging
What is cold heading?
We often call cold heading is the use of the metal’s own plasticity, pressure, or cold drawing process, so that the metal can achieve the purpose of solid deformation. On the surface, cold heading products are more handsome and brighter than hot forging products. However, in the application, the hardness and strength of hot upsetting products are higher than those of cold forging products, and the materials vary greatly for different users.
What is forging?
Forging of heavy rods or wires at room temperature. Cold heading technology is only suitable for the manufacture of bolts, nuts, nails, rivets, and other parts. Forging blanks are used for copper, aluminum, carbon steel, alloy steel, titanium alloy, etc. the utilization rate of materials is as high as 80%. The cold heading process is generally held on the cold heading machine, easy to continue, multi-station, automatic production. A series of processes such as cutting, upsetting, accumulation, forming, chamfering, thread rolling, diameter reduction, and edge cutting can be realized successively on the cold heading machine. Productivity up to 300 / min or higher.
There is a high requirement for cold heading dies. In the process of cold rolling, the blank is subjected to three-dimensional compressive stress in the die, which makes the stress of the die greater than that of the common stamping die. The stress of the die often reaches 2000mPa ~ 2500mpa. In addition to high strength, the die also needs to meet the requirements of impact toughness and wear resistance.
What are the differences between cold heading and hot heading?
- The surface of the cold heading screw is smooth and beautiful, while the surface of the hot heading screw has oxide skin.
- The production efficiency of cold heading is higher than that of hot heading.
Generally, it is difficult to cold heading the screws above M24, and hot forgingis needed.
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