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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >A Study of Surface Quality of Backwardly Extruded Short and Hollow Tubes with and without Lubrication
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A Study of Surface Quality of Backwardly Extruded Short and Hollow Tubes with and without Lubrication

机译：带或不带润滑的向后挤压短管和空心管的表面质量研究

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摘要

In metal forming processes, lubrication is generally considered to assist in reducing sliding friction that leads to fine surface finishing products. In reality, the quality of a finishing product varies with the setup of the process, the material properties of the workpiece, the geometry of the workpiece and the product, the deformation speed, and the deformation aspect ratio, etc. Study of backwardly extruding 60Sn40Pb cylindrical rods with different initial surface asperities to blind-tube under dry or wet condition indicated that: (ⅰ) for small and irregular asperities, wet condition gave better surface quality; (ⅱ) for large and irregular asperities, dry condition tended to provide favourable surface condition; (ⅲ) for simple regular asperities, no distinctively favourable condition was found; (ⅳ) for large and regular asperities, the condition varied with the deformation speed; etc.. This paper reports such study and envisages the relevant mechanisms involved so as to facilitate the proper control of the forming operation for accomplishing good quality tubes.
机译：在金属成型工艺中，通常认为润滑有助于减少导致精细表面处理产品的滑动摩擦。实际上，最终产品的质量会随工艺设置，工件的材料特性，工件和产品的几何形状，变形速度和变形纵横比等而变化。向后挤压60Sn40Pb的研究在干燥或湿润条件下，初始表面粗糙度与盲管不同的圆柱棒表明：（ⅰ）对于小的和不规则的粗糙度，湿润条件可提供更好的表面质量； （ⅱ）对于较大和不规则的凹凸，干燥条件倾向于提供良好的表面条件； （ⅲ）对于简单的定期粗糙，没有发现明显的有利条件； （ⅳ）对于大而规则的凹凸，其条件随变形速度而变化；本文报道了此类研究，并设想了涉及的相关机制，以促进对形成优质管材的成形操作的适当控制。

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