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随着工农业生产迅速发展,从一九七○年七月底开始试制和生产“495”柴油机。该柴油机粉末冶金衬套的几何精度是,外径允许差为0.02毫米。另外,一般衬套壁厚仅2～2.5毫米,而它的直径达φ45～φ72毫米。这种直径大壁又薄的衬套,用粉末冶金工艺生产是较困难的。经过工人和技术人员的不断试制,现已初步达到内外径一律不再金切加工,提高了生产效率,降低了成本。在试制过程中,对模具制造、称粉、压制、烧结等各个环节紧密配合,使粉末冶金制品终于达到设计要求。我们的具体措施如下。
With the rapid development of industrial and agricultural production, trial production and production of “495” diesel engines began at the end of July 1970. The diesel engine metallurgy bushings geometry accuracy, the outer diameter tolerance is 0.02 mm. In addition, the general liner wall thickness of only 2 to 2.5 mm, and its diameter of φ45 ~ φ72 mm. This large diameter and thin wall bush, powder metallurgy process is more difficult to produce. After continuous trial production of workers and technicians, it has initially reached the inner and outer diameter will no longer be gold cut processing, improve production efficiency and reduce costs. In the trial process, mold manufacturing, weighing powder, pressing, sintering and other aspects of close cooperation so that the powder metallurgy products finally meet the design requirements. Our concrete measures are as follows.