Research On Grinding Geometry And Grinding Force Of High-Hardness Sphere Grinding

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.