According to the results of the survey, during the bearing appearance, it was found that it was found that the sealing cover and the sealing failure of the bearing accounted for 47.3%of the total number of retreats. It shows that the failure rate of new and large -repair bearing during its quality assurance period is high, and failure will occur without the quality assurance period, resulting in frequent maintenance of the bearings. In particular, the failure of the bearing sealing failure has greatly increased the bearing retirement rate. So what causes the truck bearing secret sealing to get rid of it? According to the understanding of the China Bearing Network (referred to as the Huaxi.com), the reasons for the sharing of the truck bearing confidential cover and the control measures.
1. Reasons for cutting out the bearing dense cover
1) Because the depth or width of the outer ring groove does not meet the standard, or even no grooves, causing the sealing tooth mouth to enter the outer mouth port groove. The coordination of the outer mouth and the sealing cover to the mouth of the tooth make the coordination of over -profits fail to reach the standard or even have no profit. During the vehicle operation, the sealing cover is gradually removed due to the vibration of the vehicle.
2) Due to the non -guided chamfer on the outer outer mouth, during the sealing cover assembly, the ballad of the sealing tooth mouth cannot be successfully entered into the outer ring tooth and was cut off. Take it out.
3) When the truck section is repaired without the bearing appearance inspection, the specific inspection and judgment method of the sealless cover is performed in accordance with the regulations. It only specifies that the bearing (including the outer ring, the seal, the sealing cover, the rubber oil seal, the front of the bearing, the front of the bearing, the front, the rubber oil seal, the front Cover, rear gear, axis bolt, etc.) The appearance has cracking, bumping, loose, deformation, and other abnormalities. For this reason, when the truck does not refund the bearing, it is outside
The observation check -ups have no specific inspection standards, so that some sealing covers have not been discovered and refunded in time.
4) During general maintenance of the bearing parts, there is no measurement standards and methods such as the depth, width and width of the bearing outer ring groove in accordance with regulations, and the size of the outer circle is not measured. The unqualified bearing cannot be used to be found and controlled during general maintenance and continued to use the car to launch hidden dangers for the bearing operation.
2. Control measures to prevent the bearing secret sealing cover
1) Improve the quality of bearing manufacturing and overhaul, especially manufacturer and large repair manufacturers must focus on controlling geometric sizes such as the depth, width, processing roundness, and outer circle of the outer circle.
2) Establish information communication system for bearing manufacturing and large repair manufacturers and use units. Organize manufacturers to conduct quality exchanges with the unit each year. The use unit feeds the quality of bearing manufacturing to the bearing manufacturer and overhaul manufacturers to attract the importance of the manufacturer and large repair manufacturers to pay attention to the quality of the bearings, and avoid the same quality problems in the bearing manufactured in the future. During the bearing repair, the bearing of the bearing plant is processed on the bearing that fails to meet the standards to meet the technical standards. The standard accessories that cannot meet the standard should be scrapped and shall not be assembled in the bearing.
3) The existence of manufacturing quality found in the general maintenance process is the bearing during the quality of the quality vehicle. The manufacturer gives claims and analyzes the bearing back to the manufacturer. The quality of the bearing source reduces the occurrence of hot shaft accidents caused by the use of bearing faults.
4) Control measures for the appearance inspection and component detection of the sealing cover during the reinforcement section.
A. Set the special appearance inspection process in the bearing income and bearing blocks. The bearing of the bearing is not refuated by the workers, the foreman, the quality inspector, and the acceptance personnel one by one.
b. The appearance inspection must be manually rotated by 3 to 5 laps in the outer circle of the bearing. Careful checking the external state and internal sounds. The bearing without any disobedules should also be checked. Oil seal), whether the internal and external oil seals, the front cover, and the rear gear are cracking, loose, whether the front and rear seals are not biased, the pressure is not in place, whether the front cover, the rear gear are not positive, etc. It must not be higher than the outer end surface.
C. The front cover of the bearing after cleaning and the rear gear shall be tested in accordance with the requirements of the test items. Use, eliminate the old type front cover.
D. Develop non -degradable bearing torque detection tools to ensure that the bearing does not loosen under the specified torque without retreating.
E. In addition to the inspection and measurement of the items and standards strictly stipulated in the "Railway Vehicle Rolling Rolling Shaft Bearing, Maintenance and Management Rules", in addition to the inspection and measurement of the components Inspection and measurement of the size of the chamfer, the teeth, the width of the tooth mouth, and the depth of the groove. At the same time, different types of bearings are incorporated and inspection standards are incorporated into the "Railway Vehicle Rita Shaft assembly, maintenance and management rules".
F. Standard sealing cover and outer circle specific overweight standards during the bearing detection. When selecting a sealing cover, it is recommended to have a profit in the range of 0.18 to 0.28.
G. When the newly -made and large -repair bearing is exported, the inner diameter size and gap size should be sent to the use unit with the bearings. The use unit checks it before use, and controls the manufacturer's inner diameter size and axial gap unqualified bearing vehicle.
H. Control the phenomenon of bearing vehicles that faults caused by new buildings and overhauls due to improper packaging and protection. Even before the use of the department, the sealing seat should be removed from the bearing (except the LL sealing device) before use), and check whether the inner and outer oil seals have the phenomenon Check the sealing seat and check whether there are problems such as stuck, incorrect position and geometric size deformation in the coordination of the inner and outer oil seal. The sealing cover is in place to check in the in -depth balm deserter caliper or model inspection. It must be ensured that the compact surface of the sealing cover must not be higher than the outer side surface in the outer circle throughout the week. In the phenomenon of pressure such as pressure, it is found that unqualified bearing should stop using the batch of bearing and return to the manufacturer in batches.
I. After the bearing pressure, the speed of the speed of not less than 200 R/min, and no less than 5 minutes. During the running -in process, the worker should listen carefully to the sound of the bearing grinding at both ends, and there should be no different sounds when the bearings rotate. During the running -in process, the temperature measuring instrument should be used to test the bearing temperature ascending. During the running -in process, abnormal situations, abnormal sounds, frictions, etc., or the difference between the temperature rise on both sides should be lengthened to 15 minutes. Careful inspections should be retreated to unqualified bearing. It is forbidden to use unqualified bearing vehicles.
J. Strengthening bearing detection system, bearing single -pillar correction pressure machine, sealing cover mold mold, torque testing equipment, bearing pressure installation daily inspection and monthly comprehensive performance verification work. The equipment state cannot meet the timely renovation of the quality requirements of the work to ensure that the performance of the bearing testing equipment is good.