The characteristics of the miniature bearing surface grinding

Plane grinding in the form of different, its characteristic is also each are not identical. ( 1) The characteristics of the surrounding ground can reduce the heat generated by the deformation of workpiece, to improve the grinding precision of workpiece. Suitable for fine grinding of various artifacts plane, flatness error can be controlled in 0. 01 ~ 0. 02 mm / 1000 m, the surface roughness can reach Ra0. 8 - ~ 0. 2 gm but not when grinding the discontinuous transverse feed to do surface grinding, so the production efficiency is low, 2) Face grinding characteristics of bending deformation small, rigid, can choose bigger grinding dosage, high efficiency, easy to produce hot deformation of workpiece and burn injury; Only applies to the grinding accuracy is not high and easy to shape of the workpiece to improve the quality of the end face grinding, can adopt the following measures: (1) choose granularity coarser, hardness of soft resin bonded grinding wheel (2) the adequate supply of cutting fluid when grinding. (3) the edge grinding wheel grinding. 1) will be cone grinding wheel end into the heart, make the grinding wheel and workpiece into line contact or adjust the grinding head tilt a tiny Angle, reduction of grinding wheel and workpiece contact less, improve heat dissipation conditions ( 3) The characteristics of the surrounding a face grinding grinding dosage shoulds not be too big. 4. 1. 2 types of surface grinding machine with horizontal spindle and rectangular table or surface grinding machine with rotary table grinding circular grinding, the grinding wheel and workpiece contact area is small, the production efficiency is low but the heat dissipation in the grinding zone, chip removal condition is good, so the grinding accuracy is high. Commonly used in surface grinding machine according to the grinding wheel axis location and the structure features of the work table can be divided into horizontal spindle and rectangular table surface grinder, horizontal spindle surface grinding machine with rotary table, vertical rectangular table surface grinder, vertical shaft surface grinding machine with rotary table, double end face grinding machine several types 1, etc. Horizontal spindle and rectangular table surface grinding machine as shown in figure 4. 2 ( a) , as is shown in the grinding wheel spindle axis parallel to the workbench mesa, workpiece mounted on a rectangular electro-magnetic chuck, and with the workbench as a vertical reciprocating linear motion. Grinding wheel rotating at high speed to be intermittent lateral movement, and at the same time, after surface grinding to a layer of grinding wheel move backward, at the same time make a vertical feed, until the workpiece grinding to the desired size. 2. Horizontal spindle surface grinding machine with rotary table as shown in figure 4. 2 ( b) , as is shown in the grinding wheel spindle is horizontal, the workbench is circular magnetic chuck, with the circumference of the grinding wheel surface grinding plane, grinding, the workpiece circular electro-magnetic chuck together to rotate at a constant speed as a one-way absorption, second round except for high-speed rotation, also in the frustum of a cone between edge and center for reciprocating motion, to complete the grinding feed, every reciprocating into every time after reversing, vertical feed grinding wheel to workpiece, until the workpiece grinding to the required size. Because the workbench is continuous rotating, high grinding efficiency but not grinding surface such as the complex planar 3 steps. Vertical rectangular table surface grinding is shown in figure 4. 2 ( c) , as is shown in vertical grinding wheel spindle and workbench, the workbench is a rectangular electro-magnetic chuck, with the transverse plane of a grinding wheel, this kind of grinding machine can grind simple plane parts. Due to the second round of diameter greater than the width of the workbench, grinding wheel does not need to be transverse feed movement, the grinding efficiency is higher.