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矫直辊的结构如附图所示,材质为9Cr2,在进行中频淬火时,很多件在A处产生裂纹。我们认为产生开裂的原因主要是直槽结构处导热不良,当B面达到淬火温度时,C边早已过热或过烧,淬入油液或聚乙烯醇溶液由于热应力和组织应力同时作用,致使工件开裂。我们采用图中D所示的保护性胎具,考虑到工件的热胀性,胎具与工件周边留有一
Straightening roller structure as shown in the figure, the material is 9Cr2, IF quenching, a lot of pieces in A crack. In our opinion, the main cause of cracking is the poor thermal conductivity at the straight groove structure. When the B surface reaches the quenching temperature, the C-side is already overheated or over-burned. When quenched into the oil or the polyvinyl alcohol solution, the thermal stress and the tissue stress act simultaneously, Workpiece cracking. We use the protective tire shown in Figure D, taking into account the thermal expansion of the workpiece, the tire and the workpiece left a