摘要
在工业中广泛使用的硬密封球阀阀芯是表面喷涂有高硬度材料的大尺寸高精度球形零件，上海交通大学开发研制了专用的数控球面磨床用来磨削加工此类球形工件。目前对于平面磨削和外圆磨削的研究成果较多，但是对于使用杯形砂轮的摆动式展成法的球面磨削研究则较少，很多描述磨削过程的基本参量尚未得到完整系统的描述。
对球面磨削几何学进行了研究，推导了砂轮工件作用面积、球面磨削磨粒轨迹以及未变形磨屑面积的表达式。研究结果表明砂轮工件的相互作用面积受工艺系统结构参数和砂轮磨削状况两方面的影响，在理想情况下其实砂轮实际切入深度的正比例函数；磨粒轨迹受工艺参数和结构参数的双重影响；未变形磨面积度取决于砂轮磨粒的形状及实际切入深度，并受轨迹的密集程度的影响，轨迹密度越大磨屑未变形面积就越小。
对球面磨削的实际切入深度进行了研究，从工件材料的去除机理解释了实际切入深度随名义进给量呈现分段变化的原因。并在此基础上推导了球面磨削力的理论公式，并进行了实验验证，研究的结果表面球面磨削力主要受砂轮进给量的影响，其余工艺参数主要通过影响未变形磨屑面积影响切屑变形力从而次要的影响磨削力。
Metal hard seal ball valves widely used in industry are large-sized andhigh-precised sphere work-pieces, which are coated with materials of highhardness. Shanghai Jiao tong University developed a new kind of CNCgrinding machine to manufacturing these sphere work-pieces . At present,there are a lot of research and accomplishment on surface grinding , but theresearch of swing generating method sphere grinding was incomplete andthe basic parameters of grinding were partial.
This Thesis researched Grinding geometry of sphere grinding, andfurther derivate the contact area between wheel and work-piece, theabrasive track of sphere grinding and the un-deformed grinding chip area.The contact area between wheel and work-piece was determined bystructural parameters and process parameters and was proportional to theactual cut depth. The un-deformed grinding chip area was determined bythe shape of abrasive and the actual cut depth.
The actual cut depth of sphere grinding was researched, the reason ofpiecewise function of actual cut depth and nominal feed was the materialremoval mode. The sphere grinding force was researched, and the mainlyaffected factor of force is nominal feed, and other process parameters wasindirect effects of the grinding force.
The actual sphere grinding cut depth was researched which keyparameter for theory and practice was the bridge between grindinggeometry and grinding force research. And then the sphere grinding forcereferred surface grinding derivation was researched, based on spheregrinding geometry and actual sphere grinding cut depth, and thenorthogonal and single-factor experiment was used to certify the grindingforce equation.
引文
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