The technical requirements of the surface forged surface, including the surface roughness and surface defects. During the forging process, due to the effects of surface metals oxidized, foreign objects embedded, uneven metal flow, uneven surface surfaces, and improper sub -silver auxiliary processes, it will make the surface of the forging surface appear on the peak and valley and uneven unevenness. Micro geometry features are generally represented by roughness.
The surface roughness of the mold forged is to be exempted from the surface of the mechanical processing. The unevenness is large. Different parts of the same forging of the same forging should be largely different. Because the surface of the forging container is the result of the metal pressure -filled slot, it is not like the squeezing method of mechanical processing. Dipping the metal, so the uneven transition of the surface is relatively gentle, and the peak tip and the bottom of the valley are mostly blunt angles.
There are many surface defects on the forging, and the different shapes of the concave parts are dotted holes, which is confused with the concave pits on the macro surface. The surface roughness of the mold forged has no formal standards at present. Under normal circumstances, the surface roughness of the surface of the processing surface and normal non -processing surface should not be stipulated, but the surface of the precision forged should generally be specified.
The surface defects on the die forging include cracks, folding, wrinkles, pits, bumps, pinholes, etc. Some of them are due to the high heating temperature or corrosion, which causes the material to be damaged and the surface of the die forging shows some abnormalities, or the defects caused by operational and improper operation of the operation. Generally, it is impossible to rely on correction treatment The methods are saved, so these defects are called non -allowed defects. Other defects caused by mechanical reasons, as long as it is eliminated or can confirm that it does not have an impact on parts, the defects are allowed.`