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我厂是生产汽车仪表的专业厂,冷冲模和塑料模用量较大。其中大多数是形状复杂,精度要求高(配合间隙<0.01～0.02毫米,有的则要求无间隙)的模具。由于制造上的困难,这些模具大都是全部加工完毕配合好以后再进行淬火。这样就给热处理带来很大困难。虽然模具大多采用了 Cr12MoV 钢,而一般常规热处理方法(如多次分级淬火)很难达到技术要求,经常因变形超差整套模具报废(型腔小,形状又复杂,变形后是无法修复的)。另一方面,很多模具要求表面光洁,不允许氧化和脱碳,而在常规热处理时虽然尽量采取保护(如加强脱氧,装箱等措施),总难免有轻微的氧化、脱碳,直接影响模具的寿命与表面质量。今年六月份我们改装了一台原用做退火的真空加热罐,对 Cr12MoV钢模具进行真空加热空冷淬火处理,取得良好的效果,变形极微,表面光亮,完全达到技术要求。
I plant is the production of professional automotive instrumentation, die and plastic mold a larger amount. Most of them are complex shape, high precision (with the gap <0.01 ~ 0.02 mm, while others require no gap) mold. Due to manufacturing difficulties, most of these molds are machined and quenched after they are finished. This gives great difficulties to heat treatment. Although most of the molds are made of Cr12MoV steel, conventional general heat treatment methods (such as multiple classification quenching) are difficult to meet the technical requirements and are often scrapped due to deformation oversize molds (small cavities, complicated shapes and irreparable distortion) . On the other hand, many molds require a smooth surface and do not allow oxidation and decarburization. In the conventional heat treatment, although protection is taken as much as possible (such as strengthening deoxidation and packing), there is always a slight oxidation and decarburization that directly affects the mold Life and surface quality. In June of this year, we retrofitted a vacuum heating tank, which was originally used for annealing. The Cr12MoV steel mold was vacuum-heated and air-cooled and quenched to achieve good results. The deformation was minimal and the surface was bright, completely meeting the technical requirements.