What kind of lubrication is used for spindle bearings of important or precision machine tools?
2. universal grinder, internal grinder, grinding high speed grease for these two kinds of grinding roller bearing, the rolling bearing of high speed spindle, the spindle speed is 1000 ~ 20000r / min, according to the speed range, such as when the value is less than 1 * 106, choice of precision machine tool spindle grease (No. 3 high speed grinding grease) white grease or special grease. This kind of machine tool and bearing internal grinder similar rolling 3. universal thread grinder spindle, spindle rolling bearing structure for ball type, spindle speed range is different, such as spindle speed Y7520WDN universal thread grinder is 5745 ~ 18000r / rain, can choose 2 high speed spindle bearing grease, can also be No. 2 multipurpose grease. 4. rolling bearing gear grinding machine spindle gear grinder spindle speed, generally in the 1000 ~ 3000r / min, in the speed range, the rolling bearing can be lubricated by lubricating oil, also can be lubricated by grease, such as high speed spindle bearing grease No. 3 or No. 2 multi effect lithium base grease. Rolling bearings use N15 mechanical oil or 2 spindle oil lubrication, bearing noise, grinding head noise, grinding head temperature of 70~80 degrees, and the oil leakage is serious, bearing wear rate is high, affecting production. If the switch to general lithium grease, can eliminate the temperature rise, to avoid oil leakage, stable work, surface roughness from level 6 to level 7, and add the grease has been used to bearing scrap, can prolong the service life of 2~3 times of bearing. Improve the industry technology, can find some more and more school platform, such as Xin opportunity, or in the application market to try to search some metal processing related applications ~ hope to adopt.
Precision machine tools bear less load, grease selection is a secondary factor, but temperature rise is an important issue, must be strictly controlled. General precision machine tool spindle temperature rise at 10 degrees right. It has been reported that when the product of the bearing bore D (mm) and the spindle revolution n (R / min), such as 1 * 106, it can be lubricated with synthetic grease. At present, there are two main structural forms of spindle roller bearing for the coordinate boring machine at home and abroad, namely roller bearings and roller cone bearings, for 1. axis boring machines. Coordinate boring machine using roller bearings, such as T4240, T4163, etc., and the main shaft and the bearings are in interference fit. Therefore, the selection requirements of grease lubricated low viscosity base oil preparation, such as No. 2 low temperature grease, in order to ensure the spindle temperature rise is low; the rolling cone bearing coordinate boring machine, such as SIP 6A, SIP 8P, a DIXI 75, T4280A, T42100, T4263 and so on, all these boring machine spindle lubrication use grease lubrication.
The spindle bearings of precision machine tools are lubricated by grease, and usually use No. 2 multi effect lithium base grease. Some of them can last for 3~5 years or more. Most of the time in lithium grease foreign precision machine tool bearings, rolling bearing until scrapped, does not need the grease. The spindle bearings of precision machine tools usually have three structural forms, such as roller, roller cone and ball roller. The structure of different forms of grease requirements, such as roller bearing and spindle fit, should use the grease base oil viscosity is low; at high speed and low load, should use grease low consistency; at low speed and high load, with high consistency grease. Precision machine tool spindle speed rolling bearings and shaft diameter is an important basis for the selection of grease materials, when the bearing inner diameter of D (Im) and n (R / min glaze revolution) the product of DN is less than 0.6 * 106, with grease. When the DN value of the rolling bearing reaches L x 106, it is lubricated with "oil mist". When lubricated with lubricating oil, it is approximately the same as the sliding bearings.
