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机械工程英语第八章.ppt

发布:2017-05-25约7.67千字共14页下载文档
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Unit 8 Grinding 第八章 磨削 Grinding is a manufacturing process that involves the removal of metal by employing a rotating abrasive wheel. The latter simulates a milling cutter with an extremely large number of miniature cutting edges. ? 磨削是通过采用旋转磨轮去除金属的制造工艺。磨轮用非常大量的微型切削刃模仿铣刀进行切削。 Generally, grinding is considered to be a finishing process that is usually used for obtaining high-dimensional accuracy and better surface finish. Grinding can be performed on flat, cylindrical, or even internal surfaces by employing specialized machine tools, which are referred to as grinding machines. 一般而言,磨削被认为是一种通常用于获得高尺寸精度和较好表面光洁度的精加工作业。磨削通过采用被称为磨床的特殊机床能在平面、圆柱面甚至内表面上进行。 Obviously, grinding machines differ in construction as well as capabilities, and the type to be employed is determined mainly by the geometrical shape and nature of the surface to be ground, e.g., cylindrical surfaces are ground on cylindrical grinding machines. 显然,磨床根据结构和功能的不同有所区别,使用何种形式的磨床主要取决于被磨削表面的几何形状和物理性质。例如,圆柱面在外圆磨床上磨削。 Type of Grinding Operations 磨削作业的类型 1. Surface grinding. As the name surface grinding suggests, this operation involves grinding of flat or plane surfaces. Fig.8.1 indicates the two possible variations, either a horizontal or vertical machine spindle. 1. 表面磨削:就像其名称暗示的那样,表面磨削和平面磨削直接有关。图8.1表示了两种可能的变化:卧式磨床主轴或立式磨床主轴。 In the first case (horizontal spindle), the machine usually has a planer-type reciprocating table on which the workpiece is held. However, grinding machines with vertical spindles can have either a planer type table like that of the horizontal-spindle machine or a rotating worktable. 在第一种情况(卧式主轴),卧式磨床通常具有安装工件的刨床式往复工作台。而立式主轴磨床既可以像卧式主轴磨床那样具有刨床式工作台也可以具有旋转工作台。 Also, the grinding action in this case is achieved by the end face of the grinding wheel (Fig.8.1b), contrary to the case of horizontal-spindle machines, where the workpieces ground by the periphery of the grinding wheel. 而且在这种情况下,磨削动作是通过砂轮端面完成的(图8.1b),这与通过砂轮周边磨削工件的卧式主轴磨床正好相反。 In the first case (horizontal spind
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