How to choose between hard tooth surface reducer and soft tooth surface reducer, what is the difference?

I believe everyone is familiar with reducers, so what is a hard tooth surface reducer? What is a soft tooth reducer? How to choose when purchasing a gearbox? Let's talk about the difference between hard tooth surface and soft tooth surface reducers, and how to choose them.
The difference between hard tooth surface reducers and soft tooth surface reducers is mainly reflected in the hardness of the gear tooth surface. The higher the tooth surface hardness, the stronger the bearing capacity of the tooth surface. According to different hardness testing methods, it can be divided into three types: scratch hardness, indentation hardness, and rebound hardness:
1. Scratch hardness is mainly used to compare the softness and hardness of different minerals. The method is to select a rod with one end hard and one end soft, and scratch the tested material along the rod. The softness and hardness of the tested material are determined based on the location of the scratch. Qualitatively speaking, scratches on hard objects are longer, while scratches on soft objects are shorter.
2. The indentation hardness is mainly used for metal materials. The method is to use a certain load to press a specified indenter into the tested material, and compare the hardness of the tested material with the magnitude of local plastic deformation on the surface of the material. Due to differences in indentation head, load, and load duration, there are various types of indentation hardness, mainly including Brinell hardness, Rockwell hardness, Vickers hardness, and microhardness.
3. The rebound hardness is mainly used for metal materials. The method is to make a specially designed small hammer fall freely from a certain height to impact the sample of the tested material, and determine the hardness of the material based on the amount of strain energy stored (and subsequently released) during the impact process of the sample (measured by the rebound height of the small hammer).
Due to the close relationship between the tooth surface hardness and load-bearing capacity of the reducer gear, the Brinell hardness test method, which is pressed into the hardness, is usually used to test the tooth surface hardness. A tooth surface with a hardness greater than 350HBS is called a hard tooth surface; A tooth surface with a hardness of ≤ 350 is called a soft tooth surface. This is the fundamental difference between hard tooth surface reducers and soft tooth surface reducers.
The above is the most intuitive introduction to the difference between hard tooth surface reducers and soft tooth surface reducers by Henan Mabang Transmission. Through the above introduction, everyone should have a certain understanding of hard tooth surface and soft tooth surface, and a clear understanding of how to choose between hard tooth surface reducers and soft tooth surface reducers. At the same time, they will also make reasonable choices based on their own situation.