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Analysis of equipment methods for NSK cylindrical bore bearings
Source: Bearing network time: 2014-10-25
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Clear the bearing and associated components to view the dimensions and accuracy of the associated components. After viewing the bearing equipment, check that the filling smoothing agent is expected to be in the equipment; then turn the bearing packaging. Usually the grease is smooth; the bearing is not removed; the smooth grease is directly filled. The oil is smooth. Usually; there is usually no need to remove; however; instruments or high-speed bearings; etc.; to be cleaned with clean oil; remove the rust inhibitor coated on the bearing. Remove the bearing of the rust inhibitor; easy to rust; Feel free to place.
Furthermore; bearings that have been sealed with smooth grease; do not clear directly.
Bearing equipment method; due to bearing layout, cooperation, conditions; because usually the shaft rotation; so the inner ring demand interference cooperation. Cylindrical hole bearings; multi-use presses; or hot-packing method. Cone hole occasions; Directly attached to the tapered shaft; or with a tight sleeve device.
When the equipment is to the bearing seat; use the gap cooperation; when the outer ring has the interference; usually press with the press; or use the cooling method of the equipment after cooling. Use dry ice as the coolant; cold shrink equipment; air The moisture will condense on the outer surface of the bearing. Therefore, it is necessary to adopt the anti-rust method.
Cylindrical bore bearing equipment
Pressing with a press
Small bearings are widely used for pressing the press. As shown in Figure 1, the pad is pressed against the inner ring; the press is slowly pressed to the end of the inner ring and close to the shoulder. The outer ring is placed inside the block device. Circle; will form an indentation or crush on the raceway; so definitely stop.
In addition; when operating; should be oiled on the cooperation surface in advance. It is a must to hit the equipment with a hoe; it should be padded on the inner ring. This practice repeatedly forms bearing damage; therefore; only limited to small interference The condition; can not be used for large interference or medium and large bearings.
Non-displacement bearings such as deep groove ball bearings; occasions where the inner and outer rings require interference equipment; as shown in Figure 2; use screw or oil pressure; use the spacer to press the inner and outer rings together. Self-aligning ball bearings The outer ring is easy to skew; even if it is not an interference cooperation; it is also the best padding equipment.
Separate bearings such as cylindrical roller bearings, tapered roller bearings; can be equipped with the inner and outer rings respectively to the shaft and the bearing seat. When the inner ring and the outer ring of the equipment are combined respectively; the key points are firmly closed; The two are in violation of each other; barely press in will form a roll to the surface.
Hot-packing method <br> Large-sized bearing; requires a lot of force when pressing; so it is difficult to work. Therefore; widely used hot-packing method: heating the bearing in oil; making it swell; then loading it on the shaft. This method; the equipment will not present a situation of improper force; can shorten the working time.
The heating temperature of the bearing; the bearing scale, the required interference; refer to Figure 3. Resolution. Precautions for hot loading operations;
(a) Bearing heating does not exceed 120 ã‚šC.
(b) In order to prevent the bearing from touching the bottom of the oil sump; the bearing should be placed on a metal grid; or hoisted.
(c) In order to avoid operation; it is difficult to equipment due to the lower inner ring temperature; the bearing should be heated 20 ° C higher than the required temperature by 30 ° C.
(d) After the equipment; the bearing is cooled; the width direction is also shortened; so use a shaft nut or other suitable method; lock it; to prevent a gap between the inner ring and the bearing shoulder.
NSK induction heating equipment
In addition to oil heating, NSK induction heating equipment using electromagnetic induction principle is also widely used.
NSK induction heating equipment; built-in excitation coil; due to electromagnetic induction after power-on; current is transmitted to the heating body (bearing); heat is generated by the impedance of the bearing itself. Therefore, it can be in a short time; no heat is required to uniformly heat the bearing. High efficiency of loading work; health.
For occasions where loading and unloading are frequent; for example, roller bearings, cylindrical roller bearings for axleboxes for railway vehicles; NSK's special induction heating equipment can be used for equipment and disassembly of the inner ring.
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