Preheating-based controllable grinding reinforcing method

Abstract

The invention discloses a preheating-based controllable grinding reinforcing method. The method comprises the steps of acquiring the temperature distribution condition along the workpiece depth direction in the grinding machining process by grinding temperature simulation calculation; secondly, preheating a workpiece by adopting a preheating device to enable a temperature field (the heating temperature is controlled to be within the range of 150-250 DEG C) opposite to the grinding temperature gradient to be formed along the depth direction of the workpiece; meanwhile, grinding the preheated workpiece, enabling the heating temperature of the ground workpiece at a certain depth to be higher than the conversion temperature Ac of material austenite by overlapping grinding heat and preheating, and maintaining the heating temperature to be stable to realize the reinforced ground structure with a controllable depth and a stable structure. The preheating-based controllable grinding reinforcing method has the effects that a technology integrating grinding machining, surface strengthening and low-temperature tempering can be realized; the parameters of the preheating grinding reinforcing technology are controlled, so that the stability, the uniformity and grinding reinforcing depth of the reinforced ground structure are improved, and the industrial application level can be reached; the grinding reinforcing method has the advantages of being energy-saving, environment-friendly, high in efficiency, etc.

Description

technical field [0001] The invention relates to an integrated grinding and strengthening process of hardenable steel, which belongs to the technical field of grinding processing. Background technique [0002] Grinding strengthening technology uses the heat generated in the grinding process to rapidly heat up the surface of the workpiece to austenitize it, and rapidly cool it to achieve martensitic transformation, and achieve surface strengthening under the coupling effect of force and heat. Grinding surface strengthening technology integrates the grinding process and heat treatment, which simplifies the production process, shortens the processing cycle, and improves the production integration level of the product. However, the main disadvantage of the current grinding strengthening technology is that the depth of the grinding strengthening layer and the stability of the structure are difficult to reach the level of industrial application. Generally, parts that are subjected...

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Problems solved by technology

In order to achieve a thicker grinding depth, the grinding depth must be increased to achieve a higher grinding temperature. On the one hand, it will cause serious wear of the grinding wheel, and on the other hand, the quality of the grinding surface will deteriorate, such as increased residual tensile stress and reduced surface roughness. The time for the subsequent finishing process is increased; at the same time, due to the rapid transfer of grinding heat from the surface to the inside during the grinding process, there is a large temperature gradient and inhomogeneity from the surface to the inside of the workpiece, resulting in a grinding strengthening layer Poor structure stability affects the performance of parts; these seriously restrict the industrial application of grinding strengthening technology

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