How to Improve the Accuracy of a Bearing Centerless Grinding Machine?
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Source: China Bearing Network | Time: 2014-05-14
Centerless grinding is a widely used method in the precision manufacturing of bearings. This technique involves three main components: the grinding wheel, the regulating wheel, and the workpiece support. The grinding wheel performs the actual cutting, while the regulating wheel controls the rotation of the workpiece. The workpiece support ensures proper positioning during the grinding process. These components work together in different configurations, but the fundamental principle remains the same.
The MG1020 centerless grinding machine is known for its high precision, efficiency, and stability, making it a valuable asset in industrial applications. However, due to its high cost, many users opt for older models. A new MG1020 can cost over 130,000 yuan, while a used one may be available for around 50,000 to 60,000 yuan. If you're looking to restore an old machine to perform like a new one, here are some steps to improve its accuracy and performance.
First, ensure that all mechanical joints are properly aligned and calibrated. Disassemble the machine tool system, including the grinding wheel system, the dressing system, the guide wheel system, and the hydraulic and lubrication systems. Keep all parts organized to avoid confusion or loss.
Next, check the outer diameter of the grinding wheel shaft. If it is smaller than 75 mm, consider replacing the shaft. Use a 75 mm +0.1 mm cast iron grinding rod with a research bearing bush until full contact is achieved. Install a hole with a 75 mm +0.02 mm tolerance. A concentric sleeve with an outer diameter of 110 mm -0.02 mm should be used to adjust the machine tool's spindle so that it aligns perfectly with the housing. Ensure the lateral clearance of the main shaft is no more than 0.01 mm, and the grinding wheel shaft should be easy to turn by hand.
Then, inspect the trimmer and cylinder. Use a manual trimming device to move back and forth without any uneven pressure or shaking. There should be no gaps or inconsistencies in the movement.
Check the shaft and bearing bush of the guide wheel, similar to the grinding wheel setup. Adjust the guide wheel shaft using a concentric sleeve to ensure the lateral clearance is within 0.002 mm. There should be no abnormal noise after operation. Since the MG1020 uses a hydraulically self-lubricating rail system, it is essential to fully disassemble and adjust the hydraulic pressure from the beginning.
The lubrication system, which includes the sand-preserving wheel shaft, plays a crucial role in maintaining the machine’s performance. Just like the heart in the human body, it is vital for smooth operation. After removing and cleaning the system, test the grinding wheel and use an oil-cutting machine to verify the machine’s stability.
Finally, the adjustment method for the guide wheel dresser is similar to that of the grinding wheel. Proper alignment and calibration are key to achieving consistent results.
By following these steps, you can significantly enhance the precision and reliability of an older centerless grinding machine, bringing it up to the standards of a new one.
For more information on bearings and related topics, check out our other articles:
- Rolling Bearing Removal: Equipment and Disassembly of Bearing Housing
- "Cone Tweezers Bearing" Installation: Special Features and Selection of Bearing Clearance
- Why Bearings Fail and What to Watch Out For
This article was originally published on China Bearing Network. Please visit http://www.chinabearing.net for more details.
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