What are the differences between center-less grinders and cylindrical grinders?

1. Shaft workpieces: slender shafts, cylindrical pins

2. Cylindrical sleeve workpieces

3. The outer diameter of screws and nuts

4. Small cylindrical hardware accessories

5. The handle of some tool workpieces

1. Processing of complex-shaped shaft parts: stepped shafts, conical shafts;

2.Processing of large shaft parts: heavy machinery shafts, single-piece or small-batch shafts

Generally, the dimensional accuracy of a centerless grinder can reach about ±0.002mm, and the dimensional accuracy of a high-precision centerless grinder can be controlled within ±0.001mm

2. Shape accuracy

Generally, the cylindrical accuracy can reach 0.0015mm – 0.003mm

3. Concentricity accuracy

The concentricity error is generally between 0.002mm – 0.005mm

4. Surface roughness

Ra0.16μm – Ra0.32μm

External cylindrical grinder: The dimensional accuracy of ordinary external cylindrical grinders is about ±0.005mm, and the dimensional accuracy of high-precision external cylindrical grinders can reach ±0.0005mm or less

2. Shape accuracy

The cylindricality accuracy can reach 0.001mm or less

3. Concentricity accuracy

The concentricity error of high-precision external cylindrical grinders can be controlled within 0.0005mm – 0.001mm

4. Surface roughness

The surface roughness of ordinary external cylindrical grinders can reach Ra0.32μm – Ra0.63μm, while that of high-precision external cylindrical grinders can reach Ra0.01μm or less

The structure of the centerless grinder is relatively complex. It has a grinding wheel, a guide wheel, and a matching high-precision transmission and control system. In particular, the price of high-precision centerless grinders is relatively high. The price of ordinary centerless grinders may range from tens of thousands to hundreds of thousands of yuan, while the price of some high-precision, large-scale centerless grinders may exceed hundreds of thousands of yuan

2. Processing cost

High processing efficiency leads to lower unit cost: Centerless grinders are very efficient in batch processing of cylindrical workpieces. Because it adopts a continuous automatic feeding processing method, once the parameters are adjusted, a large number of workpieces can be ground quickly. For example, when processing small cylindrical pins, the processing speed of the centerless grinder is much faster than that of the cylindrical grinder, which reduces the equipment depreciation, labor and other costs allocated to each workpiece

3. Tool (grinding wheel) cost

The grinding wheel and guide wheel of the centerless grinder need to be replaced regularly, especially under high-load processing conditions. However, due to its processing method, the grinding surface of the grinding wheel can be reasonably utilized to a certain extent, and relatively speaking, the grinding wheel cost will not be too high in batch processing.

4. Maintenance cost

The maintenance of centerless grinders requires professional technicians because the precision adjustment of the guide wheel and grinding wheel is high. The rubber binder and other materials of the guide wheel may wear or deform after long-term use and need to be replaced or repaired in time. In addition, the transmission system and control system of the centerless grinder are also relatively complex. Regular maintenance includes inspection, calibration and repair of these systems, and the maintenance cost is relatively high.

The price range of cylindrical grinders is also relatively wide. The price of ordinary cylindrical grinders may be around tens of thousands of yuan, and the price of relatively simple small cylindrical grinders may be lower. However, for high-precision cylindrical grinders with complex functions (such as high-precision conical surface grinding, automatic compensation, etc.), the price will also be higher, up to hundreds of thousands of yuan. However, from the perspective of the overall equipment purchase cost, the price of cylindrical grinders may be slightly lower than that of centerless grinders under the same precision level and processing specifications.

2. Processing cost

The relatively low processing efficiency may lead to higher unit costs: During the processing of cylindrical grinders, especially when processing single pieces or small batches of workpieces with complex shapes, it takes a lot of time to clamp the workpiece, center positioning and adjust the grinding wheel path. This makes the processing time of each workpiece longer, resulting in relatively high equipment use costs and labor costs allocated to each workpiece.

3. Tool (grinding wheel) cost

The grinding wheel of the cylindrical grinder also needs to be replaced regularly, and when processing complex-shaped workpieces, the grinding wheel wear may be accelerated due to frequent adjustments to the grinding wheel path. For high-precision machining, more expensive grinding wheels may be required to ensure machining quality, which also increases machining costs.

4. Maintenance cost

The maintenance of cylindrical grinders focuses on the replacement and calibration of grinding wheels, maintenance of centers and chucks, etc. Although its structure is relatively simpler than that of centerless grinders, for high-precision cylindrical grinders, maintaining the accuracy of the centers and ensuring the clamping accuracy of the chucks also require professional techniques and tools. In general, the maintenance cost of cylindrical grinders is slightly lower than that of centerless grinders.

2. Hardware processing industry: used for processing various cylindrical hardware accessories, such as external grinding of screws and nuts, and processing of small cylindrical pins and other parts.

3. Tool manufacturing industry: can grind cylindrical parts such as the handle of the tool to improve the manufacturing accuracy and quality of the tool.

2.Aerospace field: extremely high precision requirements for parts, cylindrical grinders are used to process the outer cylindrical parts of aircraft engine shafts, landing gear parts, etc.

3. Precision instrument manufacturing industry: when manufacturing shafts, rods and other parts of precision instruments