What is Cold Forging?

We create products of cold forging by using press machines in our company.
Forging is defined as hitting metal materials by a hammer or a die and squeezing to create various types of shape.
By squeezing metals, metals transform to improve its strength by hardening.
There are two methods to mold metal. (Free forging by using like hammer, die forging by using dies)
In addition, forging is classified into three types by temperature at forming, cold forging (room temperature), warm forging (600 ~ 900℃) and hot forging(900 ~ 1250℃).

Types of Forging

Cold forging☛
It is carried out at room temperature (20 ~ 30 ℃). As the characteristics of cold forging, cold forging avails to mold higher precision of dimension and surface precision than warm and hot forging.
Therefore, cold forging can reduce machining process and cost of products.
However, cold forging is not suitable for complicated shapes and large products.

Warm forging☛
It is carried out at 600 ~ 900 ℃.
As the characteristic of warm forging, it is moderation of the cold forging and hot forging as a feature.

Hot forging☛
It is carried out at 900 ~ 1250 ℃. As the characteristic of hot forging, it is applied to forge complicated shapes or large products.
However, hot forging requires cutting process because it makes poor precision due to thermal expansion and contraction.