1. Forging process involves cutting the material to the desired size, heating, forging, heat treatment, cleaning and inspection. In a small manual forging, all of these operations are carried out by a few forgings and starting in a small place. They are exposed to the same harmful environment and occupational hazards; in large forging workshops, the hazards vary from job to work.
Working conditions Although the working conditions vary depending on the forging form, they have some common characteristics: moderate strength labor, dry heat, microclimate, noise and vibration, and air pollution by smoke.
2. Workers at the same time exposed to high temperature air and heat radiation, resulting in the accumulation of heat in the body, heat plus metabolic heat, can cause cooling disorders and pathological changes. The sweat amount of 8 hours of labor will vary from 1.5 to 5 liters, or even higher, depending on the small gas environment, physical exertion, and the degree of thermal suitability. In the smaller forging workshop or from the heat source, the Beja two heat stress index is usually 55 to 95; but in the large forging workshop, near the furnace or hammer machine operating point may be as high as 150 ~ 190. Easily lead to lack of salt and heat spasm. In the cold season, exposure to changes in the microclimate environment may contribute to a certain degree of adaptability, but rapid and frequent changes may pose a health hazard.
Air pollution: The air in the site may contain soot, carbon monoxide, carbon dioxide, sulfur dioxide, or also contain acrolein, the concentration of which depends on the type and impurities of the furnace fuel, as well as the combustion efficiency, airflow and ventilation.
Noise and vibration: type forging hammer will inevitably produce low frequency noise and vibration, but may also have a certain high-frequency components, the sound pressure level between 95 to 115 dB. Staff exposure to forged vibrations may cause temperament and functional disorders, which can reduce the ability to work and affect safety.