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Talking about the key of fine bearing device
Source: Bearing network time: 2013-10-06
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With the rapid development of CNC skills; "composite, high-speed, intelligent, fine, environmentally friendly" has become the primary trend of today's machine tool industry skills. In the meantime; high-speed machining can effectively improve the processing power of machine tools; shorten the processing cycle of the workpiece; It is necessary to get used to the requirements of high-speed machining for the machine tool spindle and its related components. The same; the high-precision high-speed CNC machining intermediate spindle, the feed of some fine bearings need to be satisfied with the machine tool's high precision, high speed, low noise, no fault, High reliability requirements. The quality of the fine bearing device directly affects its working condition and service life; there are many problems in the middle of CNC machining because the bearing device is not properly formed; therefore, the skill of the fine bearing device should be given satisfaction. The key points of the high-speed fine bearing device are as follows. First, the removal and removal of the fine bearing. Adhere to the hand hygiene, dry and fine bearings are taken out of the package; the operator's hand should be dry and boring; because the sweat on the hand will cause rust; if necessary, wear gloves. Fine bearings that ensure excellent smoothing action should be greased and oiled; the greased fine bearing is taken out as a non-contaminating device immediately; it is not used for grease and oil treatment. It is attached to the outer ring of the bearing when loading grease. It is necessary to add grease to the gap; it is better to add 30% of the fine bearing to the cavity; the high-speed fine bearing is greased to 20%.3 of the cavity. The fine bearing to be sealed in the package can only be removed from the original packaging before the device. After removing several sets of fine bearing packages sealed by volatile corrosion inhibitors, the package should be sealed; due to the protection of VIC paper Gas can only be adhered to in sealed packaging.4. Correctly clear the greased fine bearing can not be removed before the device; and the non-fat fine bearing needs to be removed before the device; after the removal, it should be dried and immediately put on the anti-rust oil or grease; prevent corrosion. Degrease and remove the fine bearing The following scavengers can be used: neutral, acidic or alkaline scavengers for aqueous scavengers; compatibility of alkaline scavengers with aluminum parts prior to removal, organic scavenger acid and anhydrous kerosene, light gasoline (non- Car gasoline), Freon 12-generation supplies or chlorine-containing hydrocarbon scavengers. It is necessary to pay attention to the following matters when cleaning fine bearings: environmental protection, well-being and safety of operation, it is necessary to follow the product clarification; The risk of seizure. Second, the device and device of fine bearing, the main shaft of the spindle and the fine bearing of the screw are used as the base supporting parts of the machine tool; its function directly affects the rotation speed, reversal precision, rigidity, anti-shake oscillation cutting function, noise and temperature of the machine tool. Ascending and thermal deformation, etc.; thus affecting the precision of the machined parts, surface quality, etc. Fine bearing device pays attention to matters The fine bearing device should be able to adhere to the hygiene at the site to prevent the contamination of fine bearings or the entry of foreign matter; the pollutants have a great adverse effect on the working and service life of the bearing. See the cooperation between the bearing housing hole and the shaft. Accuracy, scale accuracy and hygienic degree, when applying a small amount of oil or a small amount of grease on the cooperation surface of the ferrule; the fine bearing is simpler to the drawing part, and when the bearing housing hole and the shaft are drawn, there should be a device of 100-150. Angle, do not over-cool the bearing; because the condensation can cause the bearing and bearing cooperation surface to rust, the bearing inner ring and the spindle device need to use the orientation device method or the viewpoint matching method; that is, artificially control the radial runout error of each device component. Direction; make the errors cancel each other instead of accumulating, the bearing should be changed into sensitive and unblocked after pressing into the bearing, after the device is completed; check whether the fine bearing system works normally. Reasonable use of the device (1) When the interference is large; use a heating box, oil bath heating or inductor to heat the bearing to install; the heating temperature scale is 80 ° C ~ 100 ° C; the maximum can not exceed 120 ° C. together; Nuts or other suitable means to tighten the bearing; to prevent the gap between the ferrule and the shoulder from being shortened after the bearing is cooled. (2) When the bearing device is installed; it is necessary to apply equal pressure on the circumference of the end face of the ferrule; Press the ferrule; do not directly hit the bearing end face with the number one thing; prevent damage. In the case of small interference; press the bearing ferrule end face at room temperature; use the head to tap the device sleeve The middle part; the ferrule is pressed evenly through the sleeve. The force of the device must not be transmitted through the tumbling body; prevent direct bearing of the bearing ferrule. When pressing in; ensure the end face of the outer ring and the shoulder of the outer casing; The end face and the end face of the shaft shoulder are pressed tightly; no gap is allowed. (3) It is necessary to use the mechanical press or the hydraulic press to press the device sleeve; and ensure that it is in a horizontal condition; if it is skewed, the bearing channel will be damaged due to the force. And make the axis Abnormal noise occurs. The sleeve of the device should be completely touched by the entire circumference of the end ring of the bearing or the end face of the outer ring. Third, the dismantling of the fine bearing should be considered in the fine bearing device. The fine bearing is usually used. Ying cooperation device; when drawing, the shaft or the bearing housing hole should be provided with the opening and dismounting groove; in order to disassemble the bearing. If the fine bearing that is disassembled is to be used from the beginning, it is necessary to take care to disassemble the handling. Fine bearing When disassembling, the following points should be emphasized: to prevent direct impact on the bearing ring, the disassembly force should not be transmitted through the bearing tumbler; when the fine bearing is disassembled from the shaft, the disassembly force should be transmitted through the bearing inner ring; When disassembling the fine bearing in the hole, the disassembly force should be transmitted through the bearing shell. Once the fine bearing is disassembled, it should be removed, dried and coated with anti-rust oil or greased; prevent the shaft from receiving corrosion. In the process of fine bearing device If you pay attention to the above key; it will play a more important role in the control of the spindle temperature rise, the spindle high-precision high-speed work, and the transmission precision control.
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