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机械制造业孔的加工约占机械加工量的三分之一。而仪器仪表用的零件孔的机械加工工作量更大。随着产品精度的不断提高,要求2级精度、表面光洁度▽ 7以上的精密孔越来越多。这种孔采用传统的工艺方法,往往达不到技术要求。实践证明,用挤压加工能保证质量,降低废品率。提高经济效益。孔的挤压加工有以下特点: 1.能得到较高的表面光洁度▽8～▽11,尤其是加工有色金属的小孔,能达到用一般铰、镗孔难以达到的光洁度。
Machine manufacturing hole processing accounts for about one-third of the amount of machining. The instrument hole with the hole machining more workload. With the continuous improvement of product accuracy, requiring precision 2, surface finish ▽ 7 more and more precision holes more and more. This hole using the traditional methods, often fail to meet technical requirements. Practice has proved that the use of extrusion processing can guarantee the quality and reduce the rejection rate. Improve economic efficiency. Hole extrusion processing has the following characteristics: 1. Can get a higher surface finish ▽ 8 ~ ▽ 11, especially the processing of non-ferrous metal holes, with general hinges, boring difficult to achieve the finish.