1. use of reasonable methods of cooling:
Metal quenching effect of cooling process after a deformation cause of deformation is also very important. Hot oil than cold oil hardening deformation is small, general control at 100 ± 20 ° c. Oil cooling capacity on the deformation is also critical. Influence of agitation and speed of quenching deformation. Cooling of metal heat treatment and the faster, more uneven cooling, resulting in greater stress, bearing more of the mold. On the premise of ensuring mold hardness requirements, as far as possible the use of cooling; adopting a classification of cooling can significantly reduce metal hardening heat stress and stress are effective ways to reduce some of the more complex shape workpiece deformation; some particularly complex or workpiece requiring high precision, using isothermal quenching can significantly reduce deformations.
2. the use of appropriate media:
Under the premise of ensuring the same hardness, as far as possible the use of oily media, experiments and practice has proved that the other conditions under the premise of no differences, slow cooling of the oil medium and aqueous medium cooling speed is relatively fast. Moreover, compared with oily media, significant impact of temperature change on cooling characteristics of aqueous medium, under the same conditions of heat treatment, oily medium water medium of bearing quenching distortion are relatively small.
3. reasonable part structure:
After heat treatment of metals in the cooling process, always thin some of the cold faster, thicker part of the cold slowly. In meet actual production needs of situation Xia, should as far as possible reduced workpiece thickness disparity, parts section seeks to uniform, to reduced transition area due to stress set produced distortion and crack tendencies; workpiece should as far as possible maintained structure and material components and organization of symmetric sexual, to reduced due to cooling does not are caused of distortion; workpiece should as far as possible avoid sharp edges, and Groove,, in workpiece of thickness junction, and stepped Department to has round corner transition; as far as possible reduced workpiece Shang of hole, and slot reinforced structure does not symmetric; thickness does not uniform parts used reserved processing volume of method.



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