differences between cold forging and hot forging

Introduction

Hot forging is suitable for larger, complex parts that require high strength. While cold forging is well-suited for smaller and more intricate parts requiring high accuracy. Both of these processes play a vital role in manufacturing and offer different options depending on the requirements of the project.

In this post, let’s take a look the differences between cold forging and hot forging.

cold forging vs hot forging

The Temperature

Cold forging is at low temperature forging. Under 700℃ forging, less oxide skin formation, and no surface decarbonization phenomenon. Therefore, as long as the temperature and lubrication cooling are well controlled, the temperature forging below 700℃ can also obtain good accuracy.

In hot forging, large flanges with complex shapes can be forged because the deformation energy and deformation resistance are small. Flanges with high dimensional accuracy can be machined by hot forging in the temperature range of 900-1000℃.

The Process Speed

Hot forging has a faster rate of production than cold forging, as heating the metal accelerates the forging process. The increased speed of hot forging makes it suitable for large production runs, while cold forging is more suited for smaller scale production lines.

The manufacturing technique

Cold die forging, cold extrusion, cold heading and other plastic processing. Cold forging is the forming process of the material below the recrystallization temperature and forging below the recovery temperature. The forging without heating blank is called cold forging in production.

Hot forging is mainly to reduce the deformation resistance of the metal, so as to reduce the forging pressure required for the deformation of the bad material. By changing the as-cast structure of the flanged ingot, which can reducer the defects of as-cast structure and improve the mechanical properties of steel.

The Capabilities

Hot forging can shape larger and more complex parts than cold forging. Hot forged parts also have a more uniform microstructure and can sustain higher stress and strain, making them far more durable and resistant to wear and tear. However, cold forging can produce smaller and more intricate parts with higher accuracy. But compared to hot forging, the final product may not be as strong.

the characteristic

Cold forging fittings have good surface quality and high dimensional accuracy, which can replace some cutting. And cold forging can strengthen the metal and improve the strength of the flange. The development of cold forging technology is mainly to develop high value-added products and reduce production costs.

In hot forging, large flanges with complex shapes can be forged because of the small deformation energy and deformation resistance. Flanges with high dimensional accuracy can be machined by hot forging in the temperature range of 900-1000℃. Compared with the forging in other temperature domains, the die life is shorter, but it has greater freedom and lower cost.

conclusion

In conclusion, understanding the differences between the cold forging and hot forging, you can choose the product that is more suitable for your project.