Measures to prevent heat treatment deformation of bearings

Source: China Bearing Network Time: 2017-12-09

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1. Use a reasonable cooling method:
The effect of the cooling process on the deformation of the metal after quenching is also very important. The deformation of the hot oil is faster than the quenching of the cold oil. æ†§åˆ‚åœƒ100Â±20 Â°C. The cooling of the oil can also be crucial for the deformation. Quenching mixing Both the method and the speed affect the deformation. The faster the metal heat treatment cooling rate is; the more uneven the cooling is; the greater the stress occurs; the larger the shape of the imported bearing of the mold is. Under the premise of ensuring the hardness requirement of the mold; The use of graded 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, and some workpieces with high requirements for special mess or precision; using austempering can significantly reduce deformation.
2. Use the appropriate medium:
Under the premise of ensuring the same hardness requirement; oily medium should be selected as much as possible; test and practice prove; under the premise that there is no difference in other conditions; the cooling rate of oily medium is slower; and the cooling rate of aqueous medium is relatively faster. The comparison of oily medium; the change of water temperature has great influence on the cooling characteristics of aqueous medium; under the same heat treatment conditions; the deformation of oily medium relative to the aqueous medium nsk bearing after quenching is relatively small.
3. The layout of the parts should be reasonable:
After the heat treatment of the metal, it is in the process of cooling; it is always thin and some cold is fast; some of it is cold and slow. In the case of satisfactory production demand; the thickness of the workpiece should be reduced as much as possible; the cross-section of the part should be uniform; The stress gathering has a tendency to be distorted and cracked. 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.; There should be rounded corner transitions at the steps. Try to reduce the hole and groove layout on the workpiece. The thickness of the parts is limited.

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