金属零件磨削加工的磨削过程
<h2 style=\"margin:auto 0cm\"><font face=\"宋体\">金属零件磨削加工的磨削过程</font></h2><p class=\"MsoNormal\" style=\"margin:0cm 0cm 0pt\"><font size=\"3\"><span lang=\"EN-US\" style=\"font-family:\'times new roman\'\"><span style=\"mso-spacerun:yes\"> </span></span><font face=\"宋体\"><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\">金属零件的磨削加工所用刀具是砂轮。砂轮切削部分的几何特征是</span><span lang=\"EN-US\" style=\"font-family:\'times new roman\';mso-bidi-font-family:宋体\"><a href=\"http://www.hj9411.com/\"><span lang=\"EN-US\" style=\"font-family:宋体;mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\"><span lang=\"EN-US\">砂轮</span></span></a></span><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\">经修整后,由砂粒产生一些微小的切削刃,称为微刃;切削刃及前刀面形状不规则,往往是不规则的曲线及空间曲线并有一定的刃口圆弧半径。金属零件的磨削过程为:当磨粒与工件初接触时,并没有切削作用,只是在工件表面上产生擦滑、耕犁,直至磨粒的切削厚度增大到某一临界值时才开始初下切屑。磨削过程中,有些磨粒根本不接触工件表面,即不切削,也不擦滑、耕犁。切屑的形成大致分为三个阶段。</span></font></font></p><p class=\"MsoNormal\" style=\"margin:0cm 0cm 0pt\"><font size=\"3\"><span lang=\"EN-US\" style=\"font-family:\'times new roman\'\"><span style=\"mso-spacerun:yes\"> </span></span><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\"><font face=\"宋体\">第一阶段,磨粒对工件擦滑而过,这一阶段只有弹性变形而无切屑。</font></span></font></p><p class=\"MsoNormal\" style=\"margin:0cm 0cm 0pt\"><font size=\"3\"><span lang=\"EN-US\" style=\"font-family:\'times new roman\'\"><span style=\"mso-spacerun:yes\"> </span></span><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\"><font face=\"宋体\">第二阶段,磨粒进入工件表层,耕犁成沟槽,两侧隆起。在此阶段,由于磨削速度很高,故产生很高的温度,使表面的金属微熔;此时,随之而来的磨粒即使不能切下切屑,也可以把这些微量的微熔金属刮去一部分。这一阶段磨削温度急剧增加,会引起被磨削表面烧伤、裂纹等缺陷。</font></span></font></p><p class=\"MsoNormal\" style=\"margin:0cm 0cm 0pt\"><font size=\"3\"><span lang=\"EN-US\" style=\"font-family:\'times new roman\'\"><span style=\"mso-spacerun:yes\"> </span></span><font face=\"宋体\"><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\">第三阶段,当切削厚度增大到某一临界值时,</span><span lang=\"EN-US\" style=\"font-family:\'times new roman\';mso-bidi-font-family:宋体\"><a href=\"http://www.hj9411.com/\"><span lang=\"EN-US\" style=\"font-family:宋体;mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\"><span lang=\"EN-US\">切屑</span></span></a></span><span style=\"mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\'\">明显地沿剪切面滑移形成。</span></font></font></p><span lang=\"EN-US\" style=\"font-size:10pt;font-family:\'times new roman\';mso-fareast-font-family:宋体;mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa\"><span style=\"mso-spacerun:yes\"> </span></span><span style=\"font-size:10pt;font-family:宋体;mso-bidi-font-family:宋体;mso-ascii-font-family:\'times new roman\';mso-hansi-font-family:\'times new roman\';mso-ansi-language:en-us;mso-fareast-language:zh-cn;mso-bidi-language:ar-sa\">上述三个阶段可以连续形成.也可单独存在。它与磨削用量、材料的力学性能及砂轮切削部分的几何特征等因素有关</span>[此帖子已经被作者于1211006863编辑过]
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