Effect of heat treatment on the arrangement and hardness of tool steel 5Cr8MoVSi

Source: Bearing network time: 2014-01-30

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The effect of heat treatment on the arrangement and hardness of tool steel 5Cr8MoVSi Abstract: Leading skills to develop a thousand miles of fine test skills should be accustomed to this kind of fine test skills mechanical discipline effect leading system operation service carrying quality skills to ensure the burden of progress product quality starting point is also the most important Intention fine test skills advancement product production efficiency detection method habits rapid development of production needs can not simply detect liquid dynamic pressure bearing common shaft shell with the leading skills of the development of a thousand miles; fine test skills should be accustomed to this development. Fine test skills in mechanical disciplines The effect is to serve the leading work; bear the burden of quality skills. This requires starting with the quality of the product of progress; this is also the most important intention to reach. Secondly, the fine test skills are to improve the product. Production efficiency. Therefore, the detection method should be able to get used to the needs of rapid production; it can not be detected solely for testing; it should not affect the production efficiency because of the need of testing; from a more active point of view; it should be because of the skill of fine test Jie Out of service and then advance the production capacity. Based on the needs of leading production skills and the rules of the fine test skills itself; constantly expanding new measurement principles and testing methods; and testing information processing skills; in terms of mechanical disciplines; Several aspects need to be carried out.
1. The measurement and control in the production of zero waste is in the production operation; the ambition policy of quality assurance is the production of zero waste production. In the process of ending this policy; the effect and significance of the fine test skills are obvious. The processing quality and the installation quality of the whole machine are related to the processing equipment, the testing equipment and the analysis and disposal of the test information; thus, the production of zero waste is completed; the viewpoint of the fine test is started; the following problems should be considered: (1) Before processing the workpiece Detecting the machine tool beforehand. How to accurately and accurately check the processing equipment; Obtain the precision of the machine tool; this greatly reduces the rework; and even eliminates the rework and the error is often beneficial. Of course, this is the research and development of the detection equipment. (2) On-line measurement of the workpiece or 100% inspection of the workpiece during the production process; it is necessary to study the test equipment suitable for dynamic or quasi-dynamic; even the unique test equipment that can be integrated into the processing equipment; real-time test; According to the test results, the process parameters are continually corrected; the processing equipment is compensated or reacted. From the precision theory side It is also necessary to study the dynamic precision theory; including the identification of dynamic precision, etc. (3) Discuss how to fully use the measurement information to complete the zero waste production. After 100% online measurement data is fully used; from the analysis of the processing and measurement process in the error spread Dynamic characteristics; together with the dynamic characteristics of processing errors and accuracy loss characteristics of sensor accuracy; and product quality requirements and public service rules; give the basic theoretical model of zero waste production. Fully use artificial neural network; genetic algorithm and other modern mathematical methods Accurate processing quality guessing; quality control ahead.
2, visual test skills non-touch test skills; uniquely worth mentioning is the visual test skills. The development of modern visual theory and skills; not only to simulate the function of the human eye can be completed; more importantly, it can not end the human eye can not As a homework; visual skills are the latest skills available today; they are rapidly developed on the basis of sophisticated and sophisticated skills such as electronics, optics and computers. Visual test skills are a new test skill based on computer vision research. The visual pattern recognition and visual understanding of computer vision research are different; the visual test skills focus on the several scales of the object and the azimuth measurement of the object; such as the measurement of the three-dimensional scale of the car body-in-white, the rapid measurement of the three-dimensional shape of the mold, and the large-scale measurement. Workpiece coaxiality measurement, coplanar measurement, etc. It can be widely used in online measurement, reverse engineering and other automatic, real-time measurement process. Visual test skills are developed very quickly abroad; as early as the 1980s; the US National Bureau of Standards Estimated; 90% of the mission will be completed by the visual testing system. The United States in 80 years On behalf of more than 100 companies in the visual testing system of the operation of the city. Shan Yong Yu Yun low orange fat island Xing Xingba. At the Beijing World Machine Tool Show in October 1999, I have seen the use of visual inspection skills abroad. R & D instruments; such as movable optical three-coordinate measuring machine, high-speed high-precision digital scanning system, non-touch optical three-coordinate measuring machine and other leading instruments.
3. Measuring methods are diversified
(1) Multi-sensor blending skills in the production site The use of multi-sensor blending is the method of measuring the measurement information in the measurement process; it can improve the accuracy of measuring information. Because multi-sensors are different or different. The viewpoint acquires information; thus, it can be merged through the information between them to falsify the truth; the measurement accuracy is improved.
(2) Building block type, combined measuring method The three-dimensional measuring system of the body-in-white is attributed to this kind of method; it can also be said that it is a flexible coordinate measuring machine with good flexibility; the key lies in the establishment of the system.
(3) Portable measuring instruments such as portable optical fiber dry and measuring instruments, portable large-scale three-dimensional measuring systems, etc.; often used to deal with large-scale measurement problems in the field.
(4) Virtual instrument virtual instrument is the use of virtual reality skills in the field of fine test; there has been deep research in China. One is to virtualize a variety of digital test instruments into a digital intelligent test supported by computer. Instrument, the other is to study the virtual measurement in virtual production; such as virtual volume, virtual coordinate measuring machine.
(5) Intelligent layout It is attributed to layout detection and fault diagnosis; it is an interdisciplinary subject that blends intelligent skills, sensing skills, information skills, bionic skills, materials science, etc.; transitions the concept of monitoring to online, dynamic, and automatic real-time. Monitoring and control.
4. The measurement scale continues to the two poles. The so-called two poles refer to the large scale and small scale relative to the current measurement scale. The measurement of the general scale has been widely emphasized; various test methods have also been developed. Because of the rapid development and urgent need of the national economy; the need for testing in many aspects of production and engineering exceeds the scale we can test; such as the measurement of the shape of the aircraft, the measurement of large mechanical parts, the standard of elevator guides for high-rise buildings. Straight measurement, on-site calibration of tank trucks, etc., need to be able to carry out large-scale measurement, rapid development of microelectronics skills and biological skills; explore the needs of the microscopic world of materials; continuous improvement of measurement accuracy; and micro and nano tests.
(1) Large-scale measurement methods such as engineering land measurement methods refer to the transplantation and improvement of certain principles and methods of land measurement into mechanical engineering measurement; new measurement methods occur; and other methods for measuring large scales; Laser tailing and three-dimensional measurement system.
(2) The nanotest skills are viewed from the trend of production; the tolerances are reduced by 1/3 every ten years; therefore, the measurement needs to have higher and higher precision; and traceable to the world standard (ISO). Of course; nanometer measurement also Variety; light drying and measuring instrument, quantum dry and instrument, capacitance micrometer, X-ray dry and instrument, frequency tail-type Fabry gauge, scanning electron microscope (SEM), scanning tunneling microscope (STM), atomic force Microscope (AFM), molecular measuring machine M3 (molecular measuring machine), etc.
5, complete the needs of various traceability
(1) Self-calibration, self-calibration High-precision measurement requires high-precision traceability; in many cases it is difficult to find instruments that are satisfactory for accuracy; the important reason is that traceability restricts the measurement accuracy; in some cases, measurement instruments can be used. Calibration and virtual measurement methods; processing traceability problems.
(2) On-site direct calibration More and more measuring instruments need to be directly calibrated on site; many are still three-dimensional spatial calibration; the on-site calibration skills and instruments are the key to the completion of these calibrations.
(3) The traceability of the nano-traceable nanometer test is also an important problem. The NIST, the German PTB, and the Japanese NRIM have studied the crystal surface distance of the silicon (220) crystal. The elemental lattice scale has a good temperature at a constant temperature. Stability; can be used to establish a nano traceability benchmark.

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