What is the difference between cold forging and hot forging

What is the difference between cold forging and hot forging

There are 3 differences between hot forging Nabitu and cold forging diagrams:

1. The advantages of the two are different:

1. Advantages of hot forging: hot extrusion can not only form non-ferrous metals and their alloys with good plasticity and relatively low strength, low and medium carbon steel, etc., but also form high carbon and high alloy steel with high strength. Such as structural special, stainless steel, high-speed tool steel and heat-resistant steel.

2. Advantages of cold forging drawing: the use of cold extrusion technology to manufacture forgings can save materials, and the material utilization rate of cold extrusions can usually reach more than 80%. For example, the material utilization rate of Jiefang brand automobile piston pin dynamic cutting processing is 43.3%, while the material utilization rate is increased to 92% when cold extrusion is used.

Another example is that after the universal joint bearing sleeve is switched to cold extrusion, the material utilization rate has increased from 27.8% in the past to 64%. It can be seen that the production of mechanical parts by cold extrusion can save a lot of steel and non-ferrous metal materials.

Second, the meanings of the two are different:

1. The meaning of the hot forging diagram: hot extrusion is to heat the metal material to the hot forging forming temperature for extrusion, that is, to heat the billet to a temperature above the recrystallization temperature of the metal before extrusion.

2. The meaning of the cold forging drawing: cold extrusion is to put the metal blank in the cold extrusion die cavity, and at room temperature, apply pressure to the blank through the fixed punch on the press, so that the metal blank produces plastic deformation to make parts processing method.

3. The application objects of the two are different:

1. Application object of hot forging diagram: hot extrusion is mainly used to manufacture long parts, profiles, pipes, bars and various machine parts, stainless steel, nickel-based superalloys and refractory alloy bars, Production of raw holes for pipes and profiled materials, etc.

2. Application object of cold forging drawing: cold extrusion technology is mainly used for cold extrusion of metals such as lead, tin, aluminum, copper, zinc and their alloys, low carbon steel, medium carbon steel, tool steel, low alloy steel and stainless steel Even cold extrusion with a certain amount of deformation can be carried out on bearing steel, high-carbon high-aluminum alloy tool steel, high-speed steel, etc.