Different forging methods have different processes, among which the hot die forging process is the longest, forging blank blanking; Forging billet heating; Roll forging for blank preparation; Die forging; Trimming; Punching; Correction; Intermediate inspection for size and surface defects of forgings; Heat treatment of forgings to eliminate forging stress and improve metal cutting performance; Cleaning, mainly to remove the surface of the oxide skin; Correction; Inspection, general forging to go through appearance and hardness inspection, important forging also through chemical composition analysis, mechanical properties, residual stress and non-destructive inspection.

Workers are exposed to both hot air and thermal radiation, resulting in the accumulation of heat in the body, heat plus metabolic heat, resulting in heat imbalance and pathological changes. The amount of perspiration produced by an 8-hour labor will vary with the small gas environment, physical exertion, and degree of thermal adaptation, generally ranging from 1.5 to 5 liters, or even higher. In a small forging workshop or far away from the heat source, the heat stress index of BJH is usually 55~95. However, in a large forging workshop, the working point near the heating furnace or drop hammer machine may be as high as 150~190. Easily cause lack of salt and heat spasm. Exposure to microclimatic changes during the cold season may contribute to adaptation, but rapid and too frequent changes may pose health risks.