高精度和大直径内螺纹挤压攻丝的机理与实践

本文在多年试验和实践基础上,提出一种对大直径的内螺纹的高精度挤压加工方法,(在此之前其应用仅对铝、铜等有色金属和低炭结构钢并局限于16mm以下小直径)。总结出内螺纹的螺纹精度直接取决于丝锥的精度,而螺纹孔的位置精度却有赖于攻丝前螺纹底孔的位置精度。到本文发表时止,已成功地发展出一种高速精钻工艺来制备铬钼合金钢连杆的螺纹底孔,和一种尺寸达22—36mm的系列无槽丝锥的挤压攻丝技术以精加工内螺纹。其结果是一次挤压可获得一级螺纹精度和V7的表面光洁度,螺纹抗拉强度增加20—30%,抗剪强度增加5—10%,表面硬

A High Precision and Large Diameter Internal Threading by Extrusion

This paper presents a technique of high precision and large diameter internal threading, with the intention of widening the use of internal threading by extrusion. Up to now, its use remains within the limits of non-ferrous metal like Al, Cu, and low-carb