The maintenance and maintenance of high-precision cylindrical grinder is an important guarantee for lean production in the workshop. In the process of mechanical processing, grinding the cylindrical surface is a frequently used method in production, especially when machining workpieces with high precision and small tolerance, the requirements of equipment are also improved accordingly.
When the equipment is used for a period of time, the accuracy of each part may decline due to long-time wear and tear, so that the product can not meet the process requirements. In order to ensure the machining accuracy during grinding, it is necessary to repair and adjust the accuracy of the machine tool to make it reach the required standard. This paper discusses the repair and adjustment of high-precision cylindrical grinder.
Repair and adjustment of hydrostatic bearing for spindle of high precision cylindrical grinder
1) Before repairing the high-precision cylindrical grinder, the radial runout and axial movement of the spindle should be detected with a dial indicator to check the wear degree and crack of the spindle.
2) Remove the spindle of the high-precision cylindrical grinder, polish and grind the spindle journal, improve the surface roughness of the spindle, and make the roughness of the spindle reach ra0.05um. If the wear of the spindle is out of tolerance, the chromium plating method is generally adopted to increase the size, and then the fine grinding is carried out to make the roughness reach ra0.05um.
3) The eight oil cavities on the front and rear bearings are pulled out from the bearing holes of the high-precision cylindrical grinder. After cleaning the 0.5 mm section flow hole with gasoline, the bearing bore diameter is scrubbed and installed into the main shaft. The spindle should be handled with care to avoid damaging the hydrostatic bearing. The clearance between the shoulder and the end face is controlled by grinding and adjusting the thickness of the washer, so that the radial runout of the centering cone surface of the spindle during electric rotation is 0.0 Under 02mm, the axial movement of the spindle is less than 0.002mm.
4) The lubricating oil in the hydrostatic oil tank of high-precision cylindrical grinder is composed of 30% 20% mechanical oil and 70% kerosene. The opening pressure of the oil tank is added. The pressure is adjusted to about 1.5 MPa by using the relief valve. The pressure entering the oil chamber is adjusted to about 1.0-0.6 MPa by the feedback throttling device. After the lubricating oil enters the bearing oil chamber, check whether there is light side and heavy side after locking. The main shaft of the grinding wheel should float on the shaft In the middle of the bearing, it is subject to turning gently by hand. If it is properly adjusted, when the shaft diameter and bearing are running at a high speed, the pressure bearing oil film can be generated, that is, it is in fluid lubrication, and metal collision will not occur. Put the dial indicator contact vertically on the main shaft to check the rotation accuracy of the main shaft. The rotation accuracy of the main shaft should not exceed 0.001mm.
On 2018-08-08 11:45:46
