(1) Longitudinal grinding method
The longitudinal grinding method is the most commonly used grinding method. During grinding, the table is fed longitudinally and reciprocally, and the grinding wheel is fed periodically. The grinding allowance of the workpiece is ground in multiple reciprocating strokes.thin flat cutting disc flat cutting disc
Characteristics of the longitudinal grinding method (referred to as the longitudinal method):
1) On the whole width of the grinding wheel, the working condition of the abrasive grains is different. The sharp end of the left end surface (or the right end surface) of the grinding wheel bears the main cutting action, and the grinding margin of the workpiece part is removed by the abrasive grains at the sharp corner of the grinding wheel. Most of the abrasive grains on the width of the grinding wheel are responsible for reducing the surface roughness of the workpiece. The longitudinal grinding method has small grinding force and good heat dissipation conditions, and can obtain high processing precision and small surface roughness value.
2) Low labor productivity.
3) Small grinding force, suitable for grinding of slender, precision or thin-walled workpieces.
(2) Cut-in grinding method
The plunge grinding method is also called the transverse grinding method. The length of the outer circle of the workpiece to be ground shall be less than the width of the grinding wheel. The grinding wheel shall be continuously or intermittently fed in the direction of grinding until the entire allowance is removed. There is no longitudinal feed motion during grinding of the grinding wheel. A higher cutting speed can be used for rough grinding; a lower cutting speed for fine grinding to prevent burns and deformation of the workpiece.
The characteristics of the plunge grinding method (referred to as the cutting method):
1) The working condition of the abrasive grains on the entire width of the grinding wheel is the same, and the grinding effect of all the abrasive grains is fully exerted. At the same time, since the continuous lateral feeding is used, the basic time of grinding is shortened, so that the production efficiency is high.
2) The radial grinding force is large, and the workpiece is prone to bending deformation. Generally, it is not suitable for grinding fine workpieces.
3) A large grinding heat is generated during grinding, and the workpiece is easily burned and deformed.
4) The shape of the surface of the grinding wheel (trimming marks) will be copied to the surface of the workpiece, affecting the surface roughness of the workpiece. In order to eliminate the above defects, a slight longitudinal movement can be made at the end of the cutting method.
5) The cutting method is limited by the width of the grinding wheel and only applies to the outer surface of the grinding length.
(3) Segment grinding method
The segmented grinding method is also called the comprehensive grinding method. It is a comprehensive application of the cutting method and the longitudinal method, that is, the workpiece is first coarsely ground by the cutting method, leaving a margin of 0.03~0.04mm, and finally refined to the size by the longitudinal method. The grinding method utilizes the advantages of high productivity of the cutting method and high precision of the longitudinal processing. For segmental grinding, there should be an overlap of 5~10mm between adjacent sections. This grinding method is suitable for grinding workpieces with good balance and rigidity, and the length of the workpiece is also appropriate. Considering the grinding efficiency, a wider grinding wheel should be used to reduce the number of segments. It is optimal when the length of the machined surface is about 2 to 3 times the width of the grinding wheel.
(4) Deep grinding method
This is a more extensive grinding method that uses a larger back-feeding amount to grind away the entire grinding allowance of the workpiece in one longitudinal feed. Since the basic time for grinding is shortened, labor productivity is high.
Features of deep grinding:
1) Suitable for grinding rigid workpieces
2) The grinding machine should have greater power and stiffness.
3) Smaller one-way longitudinal feed is used for grinding. The longitudinal feed direction of the grinding wheel should face the headstock and lock the tailstock sleeve to prevent the workpiece from falling off. The hardness of the grinding wheel should be moderate and have good grinding performance.