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一、引言在冷挤压变截面厚壁筒形零件的工艺中,内表面疵病是经常遇到的一个技术难题。导致此类疵病的因素是多种多样的,主要与钢材质量、表面处理、金属塑性变性、金属的组织状态、应变时效等有关。二、点状空洞疵病的形态及分布小孔洞是正挤后出现的,形貌如眼,宽度大于深度,底部呈圆形或不规则形态。疵病洞底部清晰可见,肉眼能观察到,见图1、2。疵病约距工件内底90～320毫米,在内表圆周面
I. INTRODUCTION In the process of cold extrusion of thick-walled cylindrical parts with variable cross section, flaws on the inner surface are often encountered as a technical problem. Factors leading to such defects are varied, mainly related to the quality of steel, surface treatment, metal plastic degeneration, the state of the metal organization, strain aging and so on. Second, the shape and distribution of punctate hollow defects Small holes are being squeezed appear, the shape of the eye, the width is greater than the depth of the bottom was round or irregular shape. The bottom of the flawed hole is clearly visible and visible to the naked eye, see figures 1 and 2. Flaw from the workpiece about 300 ~ 320 mm in the inner surface of the circumference