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Fine bearing device and improved precision method
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For example, the preload is properly applied to the main shaft; the rotational speed is gradually increased to the near-operation speed; the "run-in" effect of the bearing is implemented; the cyclic rotation accuracy of the main shaft can be improved.
2. One way to improve the accuracy of the bearing is to produce a fine instrument in a factory; the main shaft is used with the 6202/P2 type bearing and its accuracy is still not satisfactory; the rear journal is thickened and a raceway is made on it to replace the inner ring; Measured in detail; each set of three scales; each set of steel balls is separated by a distance of nearly 120°; because it reduces the appearance of a heavy machining; it also reduces the appearance of a cooperation; together, the rigidity of the shaft-bearing system is improved; The maximum three and the smallest three steel balls are nearly equidistantly distributed; the axis reversal accuracy is improved; therefore, the accuracy requirements of the instrument are satisfied.
3. The inductive verification method of the device accuracy is to install the angular touch ball bearing into the main shaft; the verification order of the device accuracy is as follows (for example, a general lathe with a shaft diameter of 60 100 mm):
(1) Measuring the dimensions of the shaft and the bearing housing hole; to determine the cooperation precision of the bearing; the cooperation requirements are as follows:
The inner ring and the shaft adopt the interference cooperation; the interference is 0～+4μm (0 in light load and high precision), the outer ring and the bearing housing hole adopt the gap cooperation; the clearance is 0～+6μm (but the bearing at the free end) When the angular contact ball bearing is used; the gap can be increased), the circularity of the shaft and the seat hole is less than 2μm; the parallelism of the end face of the bearing is less than 2μm; the inner end of the shoulder is less than 2μm. The bearing block hole shoulder jumps to the axis below 4μm, and the inner end face of the spindle front cover jumps below 4μm.
(2) The fixed-end bearing on the shaft will completely remove the bearing with clean cleaning oil; the grease is smooth; the organic solvent rich in 3%-5% smooth grease is first written into the bearing for degreasing; Then use the oil gun to fill the bearing with the smooth grease (10% to 15% of the bearing space volume), heat the bearing to raise the temperature by 20 ~ 30 °C; use the hydraulic press to install the bearing into the shaft end, press the adapter sleeve The shaft is placed on the shaft with a suitable pressure to axially position the bearing, and the belt of the spring balance is wound on the outer ring of the bearing; whether the regular preload can be greatly changed by measuring the starting torque (even The bearing is correct; but because of the cooperation or deformation of the cage; the preload can also be changed).
(3) The bearing shaft assembly body is installed in the seat hole heating seat hole to raise the temperature by 20 to 30 ° C, and the bearing shaft assembly body is installed into the seat hole by the successively gentle pressure, and the front cover is adjusted; the fastening amount of the front cover is 0. 02～0. 05μm; based on the outer end of the bearing seat; the head of the dial gauge conflicts on the outer surface of the journal; the shaft is rotated to measure its runout; the demand error is below 10μm, and the dial gauge is positioned on the shaft The head is in conflict with the inside and outside of the seat hole; the shaft is rotated to measure the coaxiality of the front and rear seat holes of the bearing housing.
(4) Selecting the free end bearing in an orientation capable of canceling the error; supporting the bearing after the device is placed to the bearing housing; and canceling the roundness error and the coaxiality error between each other as much as possible.
4. The device with tapered bore double row short cylindrical roller bearing is equipped with NN3000K series tapered bore double row short cylindrical roller bearing; it is necessary to pay attention to the correct matching of the inner diameter of the bearing and the taper of the shaft; the coloring method can be used in the case of less production value. Perform touch verification; but when the production volume is large; it is best to use a fine cone gauge to verify.
When the bearing is mounted on the tapered shaft; the inner ring should be adjusted to the proper orientation in the axial direction; the radial clearance is close to zero.
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Safety nets are protective nets installed under or on the side of high-altitude building construction equipment installation or technical performance to prevent accidents caused by falling people or objects. The safety net consists of a net body, side ropes, tethers and tendons. The mesh body is braided with net rope and has diamond or square mesh. Mesh size refers to the distance between two knots adjacent to the knit. The net ropes on the edges around the net body are called side ropes. The size of the safety net (nominal size) is determined by the size of the side rope; the rope that secures the safety net to the support is called a tether. In addition, any rope used to increase the strength of a safety net is collectively referred to as a tendon.
The safety net consists of a net body, side ropes, tethers and tendons. The mesh body is braided with net rope and has diamond or square mesh. The distance between two adjacent knots of a knit is called the mesh size; the net ropes on the edges around the net body are called side ropes. The size (nominal size) of the safety net is determined by the size of the side rope; the rope that secures the safety net to the support is called a tether. In addition, any rope used to increase the strength of a safety net is collectively referred to as a tendon. The safety net material requires small specific gravity, high strength, good abrasion resistance, large elongation and strong durability. In addition, it should have a certain weather resistance, and its strength does not decrease too much after being wet and wet. Safety nets use chemical fibers as the main material. All net ropes on the same safety net must use the same material, and the wet-dry strength ratio of all materials must not be less than 75%. Generally, synthetic chemical fibers such as vinylon and nylon are mostly used as net ropes. Polypropylene is forbidden due to its unstable performance. In addition, as long as it meets the requirements of relevant international regulations, cotton, linen, palm and other plant materials can also be used as raw materials. No matter what material is used, the weight of each safety flat net should generally not exceed 15kg, and it must be able to withstand 800N impact.
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Jieyang Xinxin Industry and Trade Co., Ltd. , https://www.gdxxgm.com