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一、引言我厂是生产多种规格链条的老厂,历年来对于精度要求较高的链板板孔的加工均采用冲孔后拉孔的工艺。由于使用拉孔工序,每年需用数量很多的拉刀。又由于板孔的公差要求较严,而拉刀磨损又较快,因拉刀使用寿命较短。因此,提高了生产成本。为降低产品成本,提高经济效益和保证产品质量,我们对节距25.4mm以上的链板板孔采用了钢球挤孔新工艺。对于节距25.4mm以下的链板板孔的加工,经过反复研究,采用了小间隙冲裁的方法,取消了拉孔工序.实践证明,小间隙冲裁链板板孔,具有省力、省时、质量高、成本低的优点。
First, the introduction I plant is the production of a variety of specifications of the old factory chain, over the years for the precision of the chain plate plate hole processing are punching holes after the hole process. Due to the use of hole punching process, need a large number of broaches each year. Also due to board hole tolerance requirements more stringent, and broaches wear and tear faster, because the broach life is shorter. Therefore, the production cost is increased. In order to reduce the product cost, enhance the economic benefit and ensure the product quality, we adopted the new technology of steel ball extrusion for the chain plate hole with the pitch of more than 25.4mm. For the processing of the chain plate hole with the pitch of 25.4mm or less, after repeated research, the method of small gap blanking was adopted and the hole pulling process was canceled.It has been proved that the small gap punching the chain plate hole has the advantages of labor saving, time saving , High quality, low cost advantages.