How many methods are there for grinding pins on a centerless grinder?

There are three main grinding methods for centerless grinders; Through type, cut in type, cut in one through type, and through type centerless grinding. The workpiece is fed along the axis direction of the grinding wheel for grinding. Adjust the small inclination angle of the guide wheel axis to achieve axial feed of the workpiece. Suitable for grinding slender cylindrical workpieces. Short shafts and sleeve type workpieces without central holes. Cut in centerless grinding. There is an axial positioning fulcrum on the pallet, and the workpiece is supported at a certain position on the pallet for grinding with a grinding wheel or guide wheel. Used for grinding workpieces with shaft shoulders or bosses, as well as conical, spherical, or other rotating workpieces. One through type centerless grinding is a combination of these two. In addition, there are tangent feed grinding and end face feed grinding that allows stepped workpieces to advance and retreat in the axial direction. The productivity of the centerless cylindrical grinder is relatively high. Mostly used for mass production and easy to achieve automation. Heartless grinding machine can automatically repair and compensate. The guide wheel feed rail is a double V-shaped needle roller guide wheel, which adopts servo motor feed and can compensate with the grinding wheel dressing. The machine tool is equipped with an automatic loading and unloading mechanism, which can perform automatic cyclic grinding of tapered roller ultra precision machines

1. Continuous processing, no need for tool return, short copying time for clamping workpieces, and high productivity

2. The positioning mechanism of the bracket and guide wheel has better support rigidity than the top and center frame mechanisms of ordinary cylindrical grinders, with a larger cutting amount, and is conducive to the processing of slender shaft workpieces, making it easy to achieve high-speed grinding and strong grinding

3. The workpiece of the centerless cylindrical grinder is positioned on the positioning mechanism by the outer circle, and the grinding amount is the margin on the diameter of the workpiece. Therefore, the wear of the grinding wheel, the compensation of the feed mechanism, and the repeated positioning accuracy error of the cutting mechanism have an impact on the diameter and size accuracy of the part. It is only half of a regular cylindrical grinder, does not require a center hole, and is easy to automate loading and unloading in advance

4. The wide grinding wheel centerless grinder has a pass through mechanism that can increase the machining allowance each time. When cutting in, it can grind complex surfaces sequentially or with multiple grinding wheels, with high productivity and wide applicability

5. The centerless cylindrical grinder does not have a mechanism that guarantees the relative positional accuracy (coaxiality, perpendicularity, etc.) between the ground surface and the non ground surface, resulting in poor roundness when grinding circumferential discontinuous outer surfaces

6. Grinding surfaces can easily produce odd numbered edge roundness, which often creates the illusion that the measured size is smaller than the actual size, affecting assembly quality and work performance

7. Machine tool adjustment is complex and time-consuming. Every time a workpiece with a different diameter is replaced, it is necessary to adjust the height of the bracket, distance, and related process parameters. Therefore, adjusting the technology is difficult and not suitable for small batch and single piece production