Processing methods and characteristics:
There are three main grinding methods for centerless cylindrical grinder: through type, cut in type, cut in one through type and through type centerless grinding. The workpiece is fed along the axis of the grinding wheel for grinding. The small inclination angle of the guide wheel axis is adjusted to realize the axial feed of the workpiece. Suitable for grinding slender cylindrical workpiece. Short shaft and sleeve workpiece without central hole. Cut in centerless grinding. There is an axial positioning fulcrum on the supporting plate, and the workpiece is supported on a certain position of the supporting plate, which is cut in by grinding wheel or guide wheel for grinding. Used for grinding workpiece with shoulder or boss, cone, sphere or other revolving parts. Cutting through centerless grinding is the combination of the two. In addition, there are tangent feed grinding and end face feed grinding which make the workpiece with steps move forward and backward in the axial direction. The productivity of centerless cylindrical grinder is high. It is used in mass production and easy to realize automation.
The characteristics of centerless cylindrical grinder compared with the common cylindrical grinder, the mechanism performance of centerless cylindrical grinder has the following characteristics.
1. Continuous processing, no tool withdrawal, clamping workpiece, etc., short copy time, high productivity.
2. The support rigidity of the bracket and guide wheel positioning mechanism is better than that of the center and center frame mechanism of the ordinary cylindrical grinder, and the cutting amount can be larger, which is conducive to the processing of slender shaft workpieces, and easy to realize high-speed grinding and strong grinding.
3. The workpiece of centerless cylindrical grinder is located on the positioning mechanism by the outer circle, and the grinding amount is the allowance on the diameter of the workpiece. Therefore, the influence of grinding wheel wear, feed mechanism compensation and repeated positioning accuracy error of the cutting mechanism on the diameter accuracy of the part is analyzed. It is only half of the common cylindrical grinder, and it does not need to drill the central hole, and it is easy to load and unload automatically in advance.
4. The wide grinding wheel centerless grinder has a through mechanism, which can increase the machining allowance each time. When cutting in grinding, the complex surface can be grinded successively or with multiple grinding wheels. It has high productivity and wide application range.
5. There is no mechanism to ensure the relative position accuracy (coaxiality, perpendicularity, etc.) between the grinding surface and the non grinding surface in the centerless cylindrical grinder, and the roundness is poor when grinding the circumferential intermittent surface.
6. It is easy to produce odd number of edge roundness on the grinding surface. If it is large, it will cause the illusion that the measured size is less than the maximum solid size, which will affect the assembly quality and working performance.
7. The adjustment of the machine tool is complex and time-consuming. It is necessary to adjust the height of the bracket, the distance and the related process parameters when changing the workpieces with different diameters. Therefore, it is difficult to adjust the technology, which is not suitable for small batch and single piece production.
On 2018-08-08 11:45:46
