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农机部第三设计研究院和苏州链条厂合作进行的“428”外链片精冲工艺试验”,经半年多的共同努力,获得成功。已于一九八一年底由苏州市机械工业局主持,召开了技术鉴定会和验收会。链片内孔采用精冲工艺,在冲的一次行程中同时完成外形的落料和内孔的精冲,取消了推刀修孔的工序,产品质量达到了图纸和有关国家标准的要求,节约了排片、理片劳动量和工具及部分设备,如以一万米链条计算,可节约劳动工时1400个,工具钢28公斤,在链条行业里有一定的推广意义。在
The “428” outer chain fine-punching process test conducted jointly by the Third Design Institute of the Ministry of Agricultural Machinery and the Suzhou Chain Factory was successful after more than six months of joint efforts. It was hosted by the Suzhou Machinery Industry Bureau in late 1981. The technical appraisal meeting and the acceptance meeting were held, and the internal hole of the chain piece adopts the fine punching process to complete the blanking of the form and the fine punching of the inner hole at the same time during the stroke of the punch, eliminating the procedure of pushing the knife and repairing the holes, and the product quality has been achieved. Drawings and relevant national standards require that the number of sheets, labor and tools and some equipment are saved. For example, with a chain of 10,000 meters, 1400 hours of labor and 28 kg of tool steel can be saved. There is a certain degree in the chain industry. Promotion significance.