For springs modified by austenitic deformation, it is shown that the elastic use stress can be increased. The preliminary test test sample is a 10x30x (1015) steel sample, which is convenient for the modified austenite deformation heat treatment, and the modified austenite is modified with a large-size steel of mx (80-10) rnmx (15-25) mrn. The deformation heat treatment is to be quenched to complete the martensite transformation, and the process requirements are high. In addition, in the modified austenite deformation heat treatment, the central hole and the end portion are also processed, and the modified austenite deformation heat treatment including a series of plastic working such as continuous processing of the two ends of the steel plate, circular processing, etc. It makes the operation of quenching into martensite very difficult. In order to put the modified austenitic heat treatment technology into practical use, the austenitizing temperature, the deformation temperature, the degree of plastic deformation and the deformation rate must be controlled in an appropriate range, here, between the main deformation (variable cross-section forming) and the quenching Time control is an important factor in the processing of center holes, coils, and arcs. Spring steel SU, namely A, SUPIO and SUPIIA, were used as test materials, and the effects of various changes in the modified austenite heat treatment process on the steel grade and treatment results were investigated using existing equipment. From the main processing to the quenching air cooling stage, this period of time changes the hardness of the martensite after quenching. The main processing deformation ends, and then quenched SUP10 steel after staying in air for 405, which is higher than conventional martensite. From the actual workpiece test, the advantages of SUP10 steel are also obvious. From the deformation temperature, deformation resistance and characteristics, 850-750 ° C is the desired temperature for the modified austenite heat treatment, and the reduction rate of 30% to 50% is expected to give better results. Whether the auxiliary processing can be realized in a short time is the key to the practical application of modified austenitic heat treatment. To this end, it must be done l) variable cross-section machining, continuous control of the reduction; 2) high-speed handling between semi-finished processes; 3) ascending processing as much as possible; 4) simultaneous arcing and quenching. In order to achieve the above objectives, it is necessary to rely on fully automatic operation, and the calendering device for variable cross-section processing includes a V-type machine and an H-type machine.
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