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我厂生产的PS型、PSA型、PS型杂质泵叶轮要求轴孔内部灌铸锡基轴承合金。由于原浇注工艺不合理,浇注锡基轴承合金后,轴孔表面粗糙度精度较低,同时由于铸件本身的铸造质量的影响,锡基轴承合金经车削加工后保证不了形位公差的要求,并且锡基轴承合金内部产生的气孔也全部暴露出来,使铸件总的废品率高达50％。后经改进工艺后,取得了显著效果,铸件废品率最高为1％。 1.原浇注工艺 叶轮轴孔全部灌铸锡基轴承合金,然后进行车削加工,这样不仅浪费了大量的锡基轴承合金,而且增加了车削加工工时,增加了产品成本。同时,由于合
I plant the production of PS-type, PSA-type, PS-type impurities pump impeller shaft hole inside the cast tin-based bearing alloy. Due to the unreasonable original casting process, the precision of the shaft hole surface roughness after pouring the tin-based bearing alloy is low. Due to the casting quality of the casting itself, the tin-based bearing alloy can not guarantee the requirement of the shape and position tolerance after turning machining, and Tin base bearing alloy generated inside the pores are also exposed, so that the total castings rejection rate of up to 50%. After the improvement process, achieved remarkable results, the highest rejection rate of 1% castings. 1. The original casting process Impeller shaft hole all cast tin-based bearing alloy, and then turning, so that not only wasted a lot of tin-based bearing alloy, and increased turning working hours, increased product costs. At the same time, due to cooperation