| Home>Bearing knowledge>The reason and countermeasures of "FAG spherical roller bearing ring" cracking |
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";
The reason and countermeasures of "FAG spherical roller bearing ring" cracking
Source: China Bearing Network Time: 2014-06-16
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
First, the original data of the original data noisy, loose, brittle element segregation or carbide liquid analysis, mesh, band, do not escape uniform segregation and other shortcomings are not eliminated or improved during processing; will form stress gathering; weaken The basic strength of the ferrule; the source of the crack. The precautionary measure is to insist on the supply of the main channel; try to acquire the steel with good quality and stability; strengthen the warehousing view of the purchased steel;
Second, production and equipment 1) Casting: If there is overburning, overheating, internal cracking into mesh carbides during casting, the resistance and strength of the ferrule will be reduced. Therefore, it is necessary to strictly control the processing temperature, circulation heating and calcination. Heat dissipation conditions (such as spray cooling); in particular, after the final forging of larger types of ferrules; temperatures above 700 °C;
2) Heat treatment: close monitoring of heat treatment equipment is an important job in the workshop.
The reliability of the monitoring equipment. The important temperature control tools such as external watches and thermocouples must be closely monitored; the measurement data should be accurate and reliable, and the errors should be replaced in time; the disease operation is prohibited.
Recording of monitoring data. It is necessary to recover the temperature-recording equipment of each heat-treating equipment; in order to monitor the whole process of the equipment operation (night shift is the main point), to make the heat treatment quality have strong traceability; to eliminate false records and randomness; Providing good data for the ISO9000 quality system.
Quenching and cooling conditions. It is a disadvantage to deal with the soft points of large and medium-sized FAG spherical roller bearing rings; the composition and function of quenching oil should be determined; the replacement of the demand should be replaced; the quenching oil should be replaced by the fast quenching oil; Medium hardening ability; improved quenching cooling conditions.
Strict tempering process. Align the cracking appearance with more types; perform secondary tempering after rough grinding of the ferrule; this can further stabilize the arrangement and scale of the ferrule; reduce the grinding stress; improve the grinding and transformation Layer function. Recently, the second tempering process has been carried out on 22328/02 and 22236/02; there is verification of tailing reaction after sale.
3) Monitoring of the grinding process. The FAG spherical roller bearing ring of the product is not allowed to have grinding burns and grinding cracks; in particular, there should be no burn on the cooperation surface of the inner ring taper. If the ferrule should be pickled Perform a full inspection; remove burn products; severe burns that cannot be repaired or repaired unqualified should be voided; ferrules that have burned burns are not allowed to enter the installation process.
4) Marking treatment; before the steel is put into storage and before the ferrule is grounded; it is necessary to strictly handle each process; severely distinguish two different materials and products of GCr15 and GCr15SiMn.
Third, the possibility of ferrule overload cracking and fatigue cracking together; especially FAG spherical roller bearings with poor operating conditions (such as 22328, etc.). Discussion on the cracking appearance of the ferrule; not only from the data and production process The shortcomings of these problems are to be considered; the layout scale of the FAG spherical roller bearing parts, the processing measurement method, the processing technology, and the FAG spherical roller bearing qualification conditions are also discussed.
1) FAG spherical roller bearing layout and service conditions. Different layouts are suitable for different qualification conditions. The layout of FAG spherical roller bearing parts is different, and the processing technology is different; it also affects its quality. Therefore, we should develop new layout products; use different customary conditions; and indicate the appropriate conditions or functions of the FAG spherical roller bearing instructions; to facilitate customer selection.
2) Strengthen the process discussion; improve the processing technology; improve the processing quality; reduce the possibility of defects in processing. For example, in heat treatment; for larger types of inner and outer rings; try to use medium and lower limit quenching heating temperature; Alloying concentration; adding the cracking strength of martensite; and using high tempering temperature to enhance the impact resistance of the workpiece under the premise of ensuring the quality.
3) Improve the processing monitoring method; promote the improvement of processing quality. For example, improve the monitoring of the curvature direction of the flow channel; improve the overall function of the FAG spherical roller bearing after installation; improve the working condition of the FAG spherical roller bearing.
Recommend to friends comments close window
| Bearing related knowledge |
What are the bearing parts to be repaired after the fag bearing is disassembled?
Analysis of magnetic bearings
SKF rolling bearing thrust ball bearing classification motor NTN bearing grease function characteristics of the painful bearing corrosion analysis and avoidance
|
This article links to http://
Please indicate the bearing network http://
Previous: The reason for the early damage of NTN bearing is the following: The cause of the crack in the bearing race
Vertical Farming Grow Lights
• Lighting Spread out evenly for all directions+ Uniform Coverage+ Biggest Footprint +High Yield.
• Dimmable: 0-10v Auto/App/Wifi/Computer Remote Control Available.
• 2pcs UV Bar 365nm Combine Together with each Fixtures for Higher THC/CBD Intensity (Optional).
Indoor Farming Plants Lamp,Grow Led Light,Led Plants Grow Light,Grow Light Indoor Planting
Shenzhen MixLux Technology Co., Ltd , https://www.mixluxled.com