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NSK imported bearing quenching method and selection of cooling medium
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According to NSK imported bearing parts, the chemical composition, shape, scale and mechanical properties of the drawing requirements are different; different quenching methods can be used; each NSK imported bearing steel has its fixed C curve; the cooling medium determines the quenching Metallographic arrangement and mechanical function; therefore it is necessary to think and analyze in detail; in fact, the onset of many heat treatment defects of NSK imported bearing parts is directly related to the selection of cooling NSK imported bearing media; together with the detailed operation process .
The workpiece is heated in a heat treatment furnace until it is completely austenitized; in order to obtain the required arrangement and function; quenching treatment is required. The cooled workpiece is to be martensite arranged; the cooling rate is necessary to be greater than the critical cooling rate; However, if the cooling rate is too fast, the volume of the workpiece is shortened and the arrangement is severely changed; resulting in a large internal stress. Therefore, the conditions for obtaining martensite should be such that the cooling rate is as low as possible; and the ambition cooling curve is shown in the figure.
It is especially important to select suitable quenching medium; it determines the arrangement and function of NSK imported bearing parts after quenching; general quenching medium has three kinds of solid, liquid and gas; according to NSK imported bearing quenching, the change of medium state is divided into crops State change and no crop state change class.
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