NTN Bearing parts during heat treatment, the existence of thermal stress and stress, this internal stress can stack with each other or part of the offset is complex, because it can with the heating temperature, heating rate, cooling method, cooling rate, partschanges in shape and size changes, so the heat treatment distortion is inevitable.
Understanding and mastery of its variation can make the deformation of the bearing parts (such as ring oval, size up, etc.) placed in a controlled range conducive to the production. Mechanical collision course, during the heat treatment can also cause parts distortion, the deformation can be used to improve operations to reduce and avoid.
Several ways which can effectively reduce the deformation: ① salt bath hardening; ② The high-temperature oil quenching; ③ QSQ France; the ④ decompression quenching; ⑤ a slot three segments quenching. Salt bath quenching and high temperature oil quenching, and quenching in the martensitic transformation temperature, the martensitic transformation increased uniformity. QSQ is a two-liquid quenching. Decompression quenched by lowering the surface pressure of the quenching medium, thus extending the vapor phase, the cooling rate of decline of the high temperature zone, parts of each part of the cooling speed is uniform.
Quenching structure of a trough of three sections, the first part from the quenching temperature oil-cooling to the temperature slightly higher than the Ms point, and then baked in the atmosphere to maintain, so that the temperature uniformity of parts as a whole, and then oil cooling, the martensitic transformation uniform deformation of the irregularities is greatly improved.
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