Nylon Paint Brush,Professional Nylon Paint Brush,Fabric Rubberized Paint Brush,Plastic Grip Edge Trimmer Ningbo Beilun Gelei Plastic Parts Co.,Ltd , https://www.paintwelltools.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Discussion of ferrule defects cracking and prevention Analyze the ferrule defects cracking and prevention
The cracking of the ferrule is one of the problems that confuse the quality of the bearing; and the cracking of the shortcoming is the primary way of cracking the ferrule; the cause of the attack is that the original data itself is difficult or the production operation is not proper; the equipment can not be formed normally. . /*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 in the processing workers are not eliminated or improved; will form stress gathering; Weaken the basic strength of the ferrule; become the source of cracks. Prevent measures are to adhere to the main channel supply; try to acquire steel that is safe and secure; strengthen the inspection of purchased steel;
Second, production and equipment 1. Casting: If the burning, overheating, and internal cracking into mesh carbides during the casting process will reduce the resistance and strength of the ferrule, it is necessary to strictly control the processing temperature, circulating heating and post-forging heat dissipation conditions (such as spray cooling). Etc.; especially after the larger types of ferrules are finally forged; the temperature is 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 bearing rings; the composition and function of quenching oil should be determined; the replacement of the demand should be replaced by the replacement; the quenching oil should be replaced by the rapid quenching oil; Improve quenching and 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; and reduce the grinding stress; improve grinding Metamorphic 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 bearing ring of the product is not allowed to have grinding burns and grinding cracks; in particular, there should be no burns on the cooperation surface of the inner ring taper. If the ferrule is pickled, it should be fully inspected; Product; severe burns that cannot be repaired or returned unqualified should be voided; ferrules that have burned burns are not allowed to enter the installation process.
4. Marking processing; steel after storage into the ferrule before grinding; each process must be strictly handled; severely distinguish between GCr15 and GCr15SiMn two different raw materials and products.
Third, the possibility of ferrule overload cracking and fatigue cracking together; especially for bearings with poor operating conditions (such as 22328, etc.). Discussion on the cracking appearance of the ferrule; not only the shortcomings from the data and the production process To think about; to analyze the layout dimensions of the bearing parts, processing measurement methods, processing technology, bearing conditions and other factors.
1. Bearing layout and service conditions. Different layouts are suitable for different conditions of service. The layout of bearing parts is different. The processing technology is not the same; it affects its quality. Therefore, we should develop new layout products; The same conditions of service; and can indicate the appropriate conditions or functions of the bearing on the bearing instructions; to facilitate the selection of customers.
2. Strengthen process research; improve processing technology; improve processing quality; reduce the possibility of shortcomings 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; Concentration; adding the cracking strength of martensite; and using a higher 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 bearing after installation; improve the bearing operation.
Recommend to friends comments close window Bearing related knowledge Imported bearings in the process of demand for matters of attention Bearings lubricants selection specifications Automotive special wheel bearing introduction Imported bearings how to remove the bearing Professor Narrative SKF bearings rust
This article links to http://
Please indicate the bearing network http://
Previous:How to calculate the service life of plastic mechanical rolling bearing Next edit: Analysis of the inspection after bearing work
Analyze the ferrule defects cracking and prevention
Source: China Bearing Network Time: 2014-05-04