Characteristics Of The Inner Raceway Grinding Method Of Spherical Roller Bearings

1. Roller dressing and grinding method
   Advantages of roller dressing and grinding method:

(1) The shape of the grinding wheel is ensured by the roller. The dressing of the grinding wheel is easy and time-saving. It is suitable for grinding wheels with large holes (large abrasive grains) to grind smaller ferrules and dissipate heat quickly, but the surface roughness of the processed workpiece is poor;

(2) Clamp the workpiece at one time and grind double raceways at the same time.

Disadvantages of roller dressing and grinding method:

(1) Different types of workpieces require different types of rollers. The work of the rollers is complex, the use is cyclical, and the cost is high. The surface of the grinding wheel trimmed by the rollers is rough, which affects the surface roughness of the workpiece.

(2) The grinding surface is large and the cutting depth is large. The grinding wheel workpiece bears a large radial component and generates more grinding heat.

(3) There are strict requirements on the thickness of the grinding wheel. Different grinding wheels are required to process different types of workpieces, and the number of grinding wheels required is large.

(4) The grinding speed is low and the processing efficiency is not high.

2. Single-point dressing and forming grinding method
   Advantages of single-point dressing form grinding method:

(1) Clamp the workpiece at one time and grind double raceways at the same time;

(2) Compared with the roller dressing and grinding method, it reduces the cost of ordering a large number of rollers, appropriately reduces the dressing speed, and can improve the accuracy of the grinding wheel surface, thereby improving the surface quality of the workpiece;

(3) It is suitable for large hole grinding wheels (large abrasive grains) to grind smaller ferrules before grinding. It dissipates heat quickly, but the surface roughness of the processed workpiece is poor.

Disadvantages of single-point dressing form grinding method:

(1) Like roller dressing and grinding, the grinding surface is large, the cutting depth is large, and the grinding wheel workpiece bears a large radial component, which will generate more grinding heat;

(2) There are blind spots in the dressing method. When the diamond pen dressing grinding wheel moves to the middle position of the two grinding wheels, it is easy to interfere with the grinding wheel due to the short distance. Therefore, there are relatively strict requirements for the rotation angle θ of the diamond pen;

(3) There are strict requirements on the thickness of the grinding wheel. Different grinding wheels are required to process different types of workpieces, and the number of grinding wheels required is large;

(4) Grinding wheel dressing is complex, time-consuming, and the grinding speed is low. Therefore, the processing efficiency is not high.

3. Front and back grinding method
   Advantages of forward and reverse grinding methods:

(1) The grinding surface is smaller, the cutting depth is smaller, the grinding wheel and workpiece bear smaller radial component force, the grinding speed is higher, and the processing efficiency is higher;

(2) It is suitable for fine grinding wheels (small abrasive grains) to grind larger-sized ferrules, and the surface roughness of the workpiece is good;

(3) Grinding wheel dressing is simple and time-saving;

(4) There is no requirement for the thickness of the grinding wheel, which reduces the model and quantity of the grinding wheel.

Disadvantages of forward and reverse grinding methods:

(1) The workpiece is clamped and positioned twice, and ground twice. The coaxiality and curvature radius of the double raceways are prone to out-of-tolerance, and the size and position differences between the two raceways cannot be controlled in batches;

(2) The error in the width H of the workpiece directly affects the position difference between the two raceways, so there are relatively strict dimensional requirements for the width H of the workpiece;

(3) Two clamping and grinding operations result in low processing efficiency.

4. Offset grinding method
   Characteristics of offset grinding method:

(1) The grinding surface is smaller, the cutting depth is smaller, the grinding wheel and workpiece bear smaller radial component force, the grinding speed is higher, and the processing efficiency is higher;

(2) Suitable for fine grinding wheels (small abrasive grains) for spring cutting of larger-sized ferrules, and the surface roughness of the workpiece is good;

(3) The dressing of the grinding wheel is simple, time-saving, has no blind spots, and is suitable for grinding special or micro ferrules;

(4) There is no requirement for the thickness of the grinding wheel, which reduces the type and quantity of grinding wheels;

(5) The workpiece is clamped and positioned at one time, and the double raceway is ground, which solves the problems of large cutting depth and high grinding heat existing in the roller dressing grinding method and the single-point dressing and forming grinding method, as well as the double front and back grinding methods. Raceway coaxiality is prone to problems such as out-of-tolerance and low work efficiency.