1 Introduction
In recent years, users in the bearing sales market have often encountered some common quality problems. Most of these problems have been solved by the industry, but a few factories have not received enough attention, resulting in unqualified product quality. These common quality problems are summarized and improvements are proposed to improve the quality of rolling bearing products.
2 cleanliness
2.1 problems
(1) The parts before the bearing assembly are not cleaned.
(2) After the sleeve is closed, the bearing is not cleaned and oiled and packaged.
(3) The grease used for lubrication and rust is of poor quality.
(4) Poor conditions at the assembly site.
2.2 Improvement measures
(1) Bearing rings and rolling elements (including sealing devices, gaskets, etc.) should be carefully cleaned after final inspection and before closing.
(2) After the set is closed, the cleaning time of the finished product should be cleaned twice. The cleaning solution should be carefully filtered and replaced frequently.
(3) Apply high quality grease.
(4) Improve the parts library of the finished product and the environment at the assembly site.
3 residual magnetic
3.1 There is a problem
(1) The finished part is assembled without demagnetization.
(2) Demagnetization or demagnetization is not performed after the sleeve is closed.
(3) The power of the demagnetizer is not enough.
(4) Improper demagnetization method.
(5) The storage location after the product is demagnetized is too close to the magnetic field.
(6) The measuring instrument table and the rivet measuring the residual magnetism are magnetic.
3.2 improvement measures
(1) All bearing parts must be demagnetized before assembly.
(2) After decomposing, all the demagnetization should be demagnetized after demagnetization.
(3) Check whether the residual magnetism meets the standard requirements, and the demagnetizer power should match the product.
(4) After the workpiece is demagnetized, it is necessary to leave the demagnetizer at a certain distance (at least one meter or more) and then turn off the demagnetizer.
(5) The product that has been retracted should be placed away from the demagnetizer.
(6) Periodically demagnetize the measuring instrument table, tools and rivets used to adjust the instrument, and purchase the residual magnetic tester.
4 clearance
4.1 There is a problem
(1) The clearance of the clearance reference piece is not uniform.
(2) The adjustment of the clearance device is improper, and the measurement error is large.
4.2 Improvement measures
(1) The transmission of the industrial oil gap reference parts shall be unified by the mechanical center of the mechanical department (hereinafter referred to as the metrology center station).
(2) The metrology center station trains the industry clearance instrument operators in batches and batches, and unified measurement methods to reduce measurement errors.
5, parts rolling surface roughness
5.1 problems
(1) Most of the rolling elements have unsatisfactory surface roughness.
(2) The ferrule raceway is super fine and uneven.
5.2 Improvement measures
(1) Small and medium-sized plants should strengthen the quality acceptance of the surface roughness of the parts and add surface roughness testing instruments.
(2) The parts after super-finishing shall be inspected. Before the ferrule is assembled, the rolling surface roughness shall be checked 100%.
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6, the surface of the part burns
6.1 There is a problem
(1) The amount of turning work is too large, and the turning pattern is thick and deep, which leads to a large amount of grinding and machining, resulting in secondary tempering burns.
(2) The selection of the grinding wheel is not suitable.
(3) Insufficient cooling during grinding or deterioration of coolant.
(4) The selection of the grinding wheel line speed is unreasonable.
6.2 Improvement measures
(1) It is necessary to strictly control the machining and grinding allowance, and select the appropriate process parameters for processing.
(2) The grinding wheel should be selected correctly.
(3) The coolant should be sufficient for grinding, and the coolant must be poured on the surface to be machined. Choose the right coolant and replace it often.
(4) Select the appropriate wheel speed.
7, vibration
7.1 There is a problem
(1) The geometrical accuracy of the ferrule groove (rolling) and rolling element parts is poor, and the surface roughness and waviness are high.
(2) The ferrule is not clean and the grease is dirty.
(3) The matching steel ball has low precision.
(4) The transmission of the vibration reference member is not uniform.
7.2 Improvement measures
(1) Improve the accuracy of the circularity, waviness, roughness and groove type deviation of the bearing ring channel;
(2) Strengthen the cleaning of the parts before the joint, and seal the bearings to fill the low-noise grease.
(3) Improve the geometric accuracy of the steel parts of the bearing parts and reduce the surface roughness and waviness of the working parts.
(4) The metrology center station should pay close attention to the vibration reference of the industry.
8, appearance quality
8.1 There is a problem
(1) There are many bumps and injuries.
(2) The assembly chamfer is irregular.
(3) The bearing marks of the grinding centerless clamp are obvious.
(4) The bearing trademark code is unclear.
8.2 Improvement measures
(1) Improve the attitude and quality awareness of workers and strengthen civilized production.
(2) Formulate the process and processing according to GB274-2000 rolling bearing assembly chamfering limit standard.
(3) After all the processing steps of the bearing outer ring are finished, an outer diameter repairing process is added to eliminate the residual marks of the outer diameter and improve the surface quality.
(4) The mechanical printing head should be clear, the word depth should meet the requirements, and the surface inspection should be carried out after the surface grinding process. The writing of electrolytic printing should be clear.
9, packaging quality
9.1 There is a problem
(1) The quality of the packaging materials is poor, and the oil is easily saturated with the wrapping paper.
(2) Failure to package as required.
(3) The surface of the outer packaging is not smooth and not clean.
9.2 Improvement measures
(1) First of all, we must enhance the quality awareness of product packaging, choose the appropriate inner packaging materials, and roll them up and pack them.
(2) It should be packaged according to the requirements, that is, first use moisture-proof paper and then use plastic cloth.
(3) When the outer packaging is in a wooden box, the surface should be smooth, easy to brush, accurately transported, and packaged clean to avoid rough handling and prevent product scratches.
12 Show remaining content on this page
1 Introduction
In recent years, users in the bearing sales market have often encountered some common quality problems. Most of these problems have been solved by the industry, but a few factories have not received enough attention, resulting in unqualified product quality. These common quality problems are summarized and improvements are proposed to improve the quality of rolling bearing products.
2 cleanliness
2.1 problems
(1) The parts before the bearing assembly are not cleaned.
(2) After the sleeve is closed, the bearing is not cleaned and oiled and packaged.
(3) The grease used for lubrication and rust is of poor quality.
(4) Poor conditions at the assembly site.
2.2 Improvement measures
(1) Bearing rings and rolling elements (including sealing devices, gaskets, etc.) should be carefully cleaned after final inspection and before closing.
(2) After the set is closed, the cleaning time of the finished product should be cleaned twice. The cleaning solution should be carefully filtered and replaced frequently.
(3) Apply high quality grease.
(4) Improve the parts library of the finished product and the environment at the assembly site.
3 residual magnetic
3.1 There is a problem
(1) The finished part is assembled without demagnetization.
(2) Demagnetization or demagnetization is not performed after the sleeve is closed.
(3) The power of the demagnetizer is not enough.
(4) Improper demagnetization method.
(5) The storage location after the product is demagnetized is too close to the magnetic field.
(6) The measuring instrument table and the rivet measuring the residual magnetism are magnetic.
3.2 improvement measures
(1) All bearing parts must be demagnetized before assembly.
(2) After decomposing, all the demagnetization should be demagnetized after demagnetization.
(3) Check whether the residual magnetism meets the standard requirements, and the demagnetizer power should match the product.
(4) After the workpiece is demagnetized, it is necessary to leave the demagnetizer at a certain distance (at least one meter or more) and then turn off the demagnetizer.
(5) The product that has been retracted should be placed away from the demagnetizer.
(6) Periodically demagnetize the measuring instrument table, tools and rivets used to adjust the instrument, and purchase the residual magnetic tester.
4 clearance
4.1 There is a problem
(1) The clearance of the clearance reference piece is not uniform.
(2) The adjustment of the clearance device is improper, and the measurement error is large.
4.2 Improvement measures
(1) The transmission of the industrial oil gap reference parts shall be unified by the mechanical center of the mechanical department (hereinafter referred to as the metrology center station).
(2) The metrology center station trains the industry clearance instrument operators in batches and batches, and unified measurement methods to reduce measurement errors.
5, parts rolling surface roughness
5.1 problems
(1) Most of the rolling elements have unsatisfactory surface roughness.
(2) The ferrule raceway is super fine and uneven.
5.2 Improvement measures
(1) Small and medium-sized plants should strengthen the quality acceptance of the surface roughness of the parts and add surface roughness testing instruments.
(2) The parts after super-finishing shall be inspected. Before the ferrule is assembled, the rolling surface roughness shall be checked 100%.
6, the surface of the part burns
6.1 There is a problem
(1) The amount of turning work is too large, and the turning pattern is thick and deep, which leads to a large amount of grinding and machining, resulting in secondary tempering burns.
(2) The selection of the grinding wheel is not suitable.
(3) Insufficient cooling during grinding or deterioration of coolant.
(4) The selection of the grinding wheel line speed is unreasonable.
6.2 Improvement measures
(1) It is necessary to strictly control the machining and grinding allowance, and select the appropriate process parameters for processing.
(2) The grinding wheel should be selected correctly.
(3) The coolant should be sufficient for grinding, and the coolant must be poured on the surface to be machined. Choose the right coolant and replace it often.
(4) Select the appropriate wheel speed.
7, vibration
7.1 There is a problem
(1) The geometrical accuracy of the ferrule groove (rolling) and rolling element parts is poor, and the surface roughness and waviness are high.
(2) The ferrule is not clean and the grease is dirty.
(3) The matching steel ball has low precision.
(4) The transmission of the vibration reference member is not uniform.
7.2 Improvement measures
(1) Improve the accuracy of the circularity, waviness, roughness and groove type deviation of the bearing ring channel;
(2) Strengthen the cleaning of the parts before the joint, and seal the bearings to fill the low-noise grease.
(3) Improve the geometric accuracy of the steel parts of the bearing parts and reduce the surface roughness and waviness of the working parts.
(4) The metrology center station should pay close attention to the vibration reference of the industry.
8, appearance quality
8.1 There is a problem
(1) There are many bumps and injuries.
(2) The assembly chamfer is irregular.
(3) The bearing marks of the grinding centerless clamp are obvious.
(4) The bearing trademark code is unclear.
8.2 Improvement measures
(1) Improve the attitude and quality awareness of workers and strengthen civilized production.
(2) Formulate the process and processing according to GB274-2000 rolling bearing assembly chamfering limit standard.
(3) After all the processing steps of the bearing outer ring are finished, an outer diameter repairing process is added to eliminate the residual marks of the outer diameter and improve the surface quality.
(4) The mechanical printing head should be clear, the word depth should meet the requirements, and the surface inspection should be carried out after the surface grinding process. The writing of electrolytic printing should be clear.
9, packaging quality
9.1 There is a problem
(1) The quality of the packaging material is poor, and the oil is easily saturated with the wrapping paper.
(2) Failure to package as required.
(3) The surface of the outer packaging is not smooth and not clean.
9.2 Improvement measures
(1) First of all, we must enhance the quality awareness of product packaging, choose the appropriate inner packaging materials, and roll them up and pack them.
(2) It should be packaged according to the requirements, that is, first use moisture-proof paper and then use plastic cloth.
(3) When the outer packaging is in a wooden box, the surface should be smooth, easy to brush, accurately transported, and packaged clean to avoid rough handling and prevent product scratches.
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BT Alloy Co.,Ltd. was founded in 2005 with a strong financial foundation, a sound system ofpersonnel and system management. The company is located in 205 Century Road,Dawukou Area, Shizuishan,Ningxia Province, China, and mainly produceand sale related Ta, Nb, Be and Graphite, Al products, semi-finished products. Afteryears of development, the company has two factories, which covers an area ofmore than 40000 square meters, with professional facilities and personnel.
Companiesadhering to the scientific management of modern enterprises, the production ofprecision, forge ahead, pioneering and innovative, rapid rise to the strengthenterprises in the local market. BT Alloy firmly believe that there is nomarket for the enterprise, only have enterprises that cannot find market. Thequality of the product and the company's integrity has been established as theprimary task. Over the years, BT Alloy spent lots of capital on the productdevelopment, and now has a mature technology and ability to provide highquality products for our customers.
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