Cold extrusion of plastic deformation of metallic materials is used to obtain the required shape, size and mechanical functioning parts of a forming process, therefore stock volume that is part volume.
Blank diameter dimension of a hub, which determines the reduction of forward extrusion parts fair ensures that two diameter dimensions of extrusion deformation degree of balance, reducing the deformation resistance of extrusion, avoid squeezing entry bearing parts defects, extend the life of the mold. According to the experience in extrusion of bearing steel, complex parts at the beginning of forward extrusion cross section reduction is best contained within 50%.
Cold extrusion process according to the shape and dimensional accuracy of angular contact ball bearing parts, lathe cutting method of preparation of high quality stock, after annealing softening light, rolling, pickling, the stock, and then by phosphate coating and saponification process and final extrusion.
In the strength theory and design of cold Extrusion die, die are generally seen as the average pressure of thick wall cylinder. For thick cylinder subjected to internal pressure, its diameter was formed too large cuts to the stress caused by the mold cracked and the main causes of damage, and thus strength calculate and validate, what is the synthesis of stress at the surface, so that it does not exceed the tensile strength of the material yield limit.
Maximum shear stress theory of strength, material damage due to the maximum shear stress, as long as the maximum shear stress reaches a certain value (that is, a simple stretch compression damage when maximum shear stress), material damage.
Reduced move surface grinding Super fine Shi of vibration, obtained good of surface processing shape precision and surface lines quality for reduced vibration, mill Super machine required has good of anti-vibration sexual, bed body, important structure pieces has suction vibration sexual, Super fine machine of oil stone oscillation system has good of anti-vibration idea can; progress grinding speed, abroad grinding 6,202 outside roll road General used 60,000 electric spindle, grinding speed 60M/s above, at home general low was more, main by spindle and the main bearing function of limit. In high-speed grinding Shi, grinding force small, grinding metamorphic layer thin, does not easily burn, and can progress processing precision and efficiency, on low noise corner contact ball bearing effect is large; spindle message stiffness and speed characteristics on low noise bearing grinding vibration effect is large, stiffness more high, grinding speed on grinding force of changes more does not sensitive, grinding system vibration more small; progress spindle bearing support rigid, used with mobile balance technology, progress grinding spindle of anti-vibration sexual. Grinding vibration velocity in foreign countries (such as Gamfior) around at home and a spindle one-tenth; progress cutting function of wheel stones and finishing quality is essential. My currently wheel oil stone main topics is organization structure average sexual poor, serious effect low noise corner contact ball bearing mill Super processing quality; full cooling, progress filter precision; progress fine to system of into to resolution, reduced into to inertia; fair of mill Super processing technology parameter and processing process is not ignored of factors, grinding left volume to small, shaped bit tolerance strictly, small and medium ball bearing od should not be with Super lapping, rough fine mill Super should not be separate, to guarantee good of surface quality.
Bearing installation methods vary depending on the bearing structure, fit, provided, in General, rotate, take the inner ring fits. Bearings with a cylindrical bore, press onto, or multiple-use and loading method. Tapered bore, installed directly on the tapered shaft or sleeve installed.



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