Measures to prevent heat treatment deformation of INA bearings

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Measures to prevent heat treatment deformation of INA bearings

Source: China Bearing Network Time: 2014-09-27
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1. Use reasonable cooling method: the effect of cooling process on the deformation after metal quenching is also very important. The cause of deformation is hot oil quenching than cold oil quenching. 憧刂圃100±20°C. The cooling of oil can also be the deformation Important. Quenching mixing method and speed affect deformation. The faster the metal heat treatment cooling rate; the more uneven the cooling; the greater the stress that occurs; the greater the deformation of the mold. Under the premise of ensuring the hardness requirement of the mold; Pre-cooling, the use of grading cooling quenching can significantly reduce the thermal stress and arrangement stress during metal quenching; it is a useful method to reduce the deformation of some shapes and messy workpieces, for some workpieces with high requirements of chaos or precision; using austempering can be obvious Cut the deformation.
2. Use suitable medium: under the premise of ensuring the same hardness requirement; use oily medium as much as possible; test and practice prove; under the premise of no difference of other conditions; oil medium cooling rate is slow; and water medium cooling speed is relatively fast Some. And; compared with the oily medium; the change of water temperature has a great influence on the cooling characteristics of the aqueous medium; under the same heat treatment conditions; the deformation of the oily medium relative to the aqueous medium after quenching is relatively small.
3. The layout of the parts should be reasonable: the metal is heat treated and is in the process of cooling; it is always thin and some is cold; the thick is somewhat cold. In the case of satisfactory production and production requirements; the thickness of the workpiece should be reduced as much as possible; In order to reduce the distortion and cracking tendency of the transition zone due to stress gathering, the workpiece should adhere to the symmetry of the layout and data components and arrangement as much as possible; to reduce the distortion caused by uneven cooling, the workpiece should be as sharp as possible to prevent sharp edges, grooves, etc.; The thick and thin junctions and steps of the workpiece should have rounded corner transitions. Try to reduce the asymmetry of the holes and groove ribs on the workpiece, and use the reserved machining amount for the uneven thickness parts.
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