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一些发动机厂真空处理炉上使用的大型“O”形橡胶圈,其规格为φ2000×30毫米。原由某橡胶厂供应,但其寿命很短。一九七七年要求我厂协作。对于这种大规格的“O”形橡胶圈,我厂也未曾制造过。该圈是密封元件,表面要求光滑,若采用挤出成型,其表面质量未必能够满足密封要求。若采用模压成型,而我厂又无大型液压机,也无大型车床加工其模具。经过研究后,决定采用局部硫化模具分段成型。局部硫化模具结构很简单,如下图所
Some large “O” rubber rings used on the vacuum furnaces of engine plants have a size of φ2000 × 30 mm. Originally supplied by a rubber factory, but its life is short. In 1977, I asked my factory to cooperate. For this large-size “O” rubber ring, I have not manufactured factory. The ring is a sealing element, the surface requires smooth, if using extrusion molding, the surface quality may not be able to meet the sealing requirements. If the use of molding, and I have no large-scale hydraulic plant, there is no large lathe mold processing. After research, decided to adopt partial vulcanized mold section molding. Local curing mold structure is very simple, as shown below