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In the course of social development, metrology are economic activities, national defense construction, and important basis for scientific and social development, development of science and technology depends on the development of measurement and test technology, it provides reliable data for science and technology. In mechanical product, ball bearings for precision machine components plays an important role. With the development of science and technology, accuracy for rolling bearings products have become increasingly demanding, bearing parts machining accuracy are constantly improving. Bearings in the production process, dimensional accuracy of the bearing parts are passed by special standards for size, bearing the level of standard equipment precision, directly affect the product identification accuracy of bearing of high and low, bearing the verification, calibration of equipment, is the important basis for guaranteed quality bearing products. Bearing standards verification, calibration of equipment is sorted by measurement standards and measuring equipment, precision of measurement standards and measuring equipment of high and low will be directly reflected in the bearings on the standard equipment. Therefore, do the work of the verification, calibration, ensure the quality of measurement has become more important.
1 Strengthening instruments, measurement standards management
Strengthen the management of instruments and standards is to ensure that the basis for measuring the quality of work. First of all, instruments, measurement standards to be strictly according to the requirements of the quality manual verification, calibration, to ensure that the instruments, during the term of measurement standard instruments Yan Chang run and accuracy. Secondly, some rarely used during the regular verification of the instrument, to ensure good performance when used, works. Strictly against the use of more than verification period of measuring instruments and equipment. Furthermore, measurement standards and calibration of gun should be based on the precision of high or low to select the desired inspection departments, such as national measurement Institute, Center metering stations, provincial metrology sector.
In addition, to be practical as well as instruments and maintenance of measurement standards, which is very important to guarantee the quality of measurement d. Of instruments and measurement standard maintenance work should be carried out on a regular basis, in accordance with the program files in the standard of maintenance procedures for instruments and measuring apparatus for dust, rust and other maintenance work. Good maintenance work not only to better maintain the accuracy of measurement apparatus and instruments, but also to extend their service life.
2 ensure the verification and calibration of the originals, certificate of quality
Measurement is a scientific and rigorous work, calibration, calibrate the originals to the certificate issued, each step of solid at all sloppy. True, complete, accurate and reliable is the original record of the most basic requirements.
First of all, qualified original records should have the authenticity, completeness and accuracy.
Authenticity is to faithfully reflect the realities of local accreditation, calibration, reflect the data in the process of verification, calibration, phenomenon, using measuring instruments, equipment and environmental conditions were recorded in the real situation of the original ditch of stagnant water. To maintain authenticity requires us to measure staff to work in scientific attitude, seriously every-time verification, calibration procedures and each measurement data not
Allow a sloppy and fraud occurred.
Integrity is to create a standard complete original form, in the form of test items to be as detailed as possible, there is sufficient information to meet the needs of verification and calibration certificates issued by. Fill in the original handwriting is correct, clear and easy to identify, the page to keep it clean. While correction to standardization, when record when an error occurs,-error should be modified, do not wipe the paint off to avoid illegible or lost, and fill in the correct value next to it. All changes to the records there should be changes to the signature or signature abbreviations, to state their responsibilities.
Accuracy is a measurement of the core, there is no accuracy, calibration, calibration loses its significance. Established inter alia relies on the accuracy of high accuracy of measurement standard instruments and working equipment, the paste to a different verification method and measurement of quality of staff. Questionable verification, calibration data using different measurement methods and different measuring instruments validation, verification, calibration to ensure the accuracy of the data. And for a measured, should be according to the precision of its different, taken to meet its measurement accuracy of measuring methods and measuring instruments.
Measurement verification and calibration certificates are produced by the staff of "product" is the concentrated expression of efficient measurement. Eligibility verification and calibration certificate formats should be standardized, complete, clear, accurate, objective, verification and calibration results should contain all the information. As verification, and calibration Shi by using of measurement standard apparatus name; measurement standard Manager certificate number; instrument equipment name, and model; by based on of technology file number, and name; verification, and school on time of environment conditions (as temperature, and humidity,); verification, and audit, and competent personnel of signature; certificate using validity; measurement results of does not determines degrees and indicates that tracing sexual of situation,.
Refers to the measurement uncertainty of measurement results cannot be sure of the level to indicate that the measurement results of the trustworthiness. Due to the inadequate awareness of limitations, capabilities, any measure is unlikely to be absolutely accurate, are bound to be errors. Uncertainty is a new concept based on the theory of errors, indicating the measurement device quality. Smaller uncertainty, higher quality of measurement results, but lower the quality of the measuring results, its value will be low. Therefore, at the time of measurement and use of measurement results, must take into account the measurement uncertainty. Strictly speaking, does not know the uncertainty of measurement results, cannot be compared to each other, do not have value, are meaningless.
Verification and calibration certificate should be able to provide dates back to the national standards for measuring and consistent with the description of the measurement specifications. Under the conditions beyond the traceability to the national standards for measuring, laboratories should provide satisfactory evidence of the results, for example in a suitable interlaboratory comparison or proficiency.
Verification and calibration traceability certificate uncertainty and show that to meet the requirements of the lower laboratory standards for measuring or testing in order to meet the IS0/IE017025 "General requirements for the competence of testing and calibration laboratories", in IS09001 quality management and quality assurance requirements.
3 verification and calibration to ensure that working conditions meet the requirements
Verification and calibration of working environment conditions must meet the needs of measurement, measurement of indoor and outdoor environments should not affect the measurement accuracy, reliability and validity of the results. Measurement should be equipped with the appropriate facilities to monitor environmental conditions, record, control over the various factors that may affect the accuracy and, if necessary, appropriate reasonable verification should be carried out. General ambient temperature of 20 ± o. Around 5 ° c, humidity at around 60%. Measurement Studio must be dust, pollution and noise-proof and shock-proof, corrosion-proof, and so on. Inadequate environmental conditions could bring many disadvantages to verification and calibration work, each request does not meet the conditions laid down are directly affecting the measurement accuracy, reliability and validity. Needs verification and calibration of environmental conditions is the most basic conditions of work, and Measurement Studio should have a good internal management, that management is not limited to health and tidy, should also include a variety of safety precautions.
4 improve the quality measurement staff's technical operations and quality
Improving the quality of measurement of the technical quality of the staff and good verification and calibration work is guaranteed. Verification and calibration work is of a scientific, legal, policies are very strong. In person, machine, material, method, people in the ring is the first, advanced equipment or to staff to operate with good quality, development of the Metrology laws and regulations, must rely on measuring staff strictly enforced, can play a role. This requires that personnel engaged in Metrology is not only a good technical quality, professional quality, must also have high ideological quality.
First, the new staff induction measurement in accordance with the provisions of the program file, after strict training, test to be certified. Examination results are to be recorded. Secondly, should be equipped with enough to fit with the range and volume of work measurement staff, these measures must go through the necessary education and training of staff, have the technical knowledge and professional experience. While measuring staff on a regular basis in a variety of technical operations, standards, measurement of the laws, regulations and other aspects of training and learning, so that it continues to update knowledge, improve the level of technology at the same time improve their quality in order to adapt to and meet the new century of metrological verification, calibration and Metrology management needs.
In short, bearing instruments for measurement standards and calibration work is a detailed and complex work, influencing factors, and broad. Only these aspects carefully made work, guarantee the quality of measurements, in order to effectively guarantee the quality of verification and calibration of apparatus bearing standard, for bearings production technology improved.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7905CTYNDBLP4 NSK | 25 | 42 | 9 |
| 7904A5TYNDBLP4 NSK | 20 | 37 | 9 |