Grinding and Electrical Discharge Machining (EDM) for Auto Parts Micro Screws

2025,11,27

Grinding time can lead to localized overheating of the metal surface, resulting in high residual surface stress and structural changes, thus causing grinding cracks.

Furthermore, improper pretreatment of the original structure, carbide segregation, coarse grains, and insufficient tempering can all cause grinding cracks.

Therefore, while ensuring material quality, it is crucial to select a suitable coolant to control cooling during the grinding process. Controlling the grinding speed is also essential to reduce cracking.

After quenching and tempering, EDM can form a bright white hardened martensitic layer on the surface of Auto Parts Micro Screws. The thickness of the hardened layer is determined by the current intensity and frequency during machining.

The depth is deeper during rough machining and shallower during finish machining. The hardened layer generates significant stress on the surface of the auto parts Micro Screws.

If the hardened layer is not removed or the stress is not relieved, the surface of the Auto Parts Micro Screws is prone to electrical cracking, pitting, and cracking during use. The hardened layer can be removed or stress relieved through the following methods:

① Removing the hardened layer with an oilstone or grinding;

② Reducing the stress below the tempering temperature without reducing hardness can significantly reduce surface stress in the cavity.

Author:

Mr. yjfastener

E-mail:

hou@citool.com

Phone/WhatsApp:

+8615826187211