Heat treatment is an important part of the machinery industry. It is an indispensable and important part of the modern manufacturing production chain. It is the key processing step to promote the full potential of metal materials and improve the intrinsic quality and service life of mechanical parts. It is the basis of manufacturing. technology. The performance and life of mechanical products are not solely dependent on the type and composition of the materials. The heat treatment can change the internal structure of the materials, thereby changing the performance of the materials and improving the life. The quality of the heat treatment on the parts and their components is critical. And long-lasting. Increasing the level of heat treatment technology and production technology can achieve energy conservation, material saving and enhance the competitiveness of enterprises. In order to thoroughly implement the scientific development concept, comprehensively implement the strategic tasks put forward by the 17th National Congress of the Communist Party of China, and combine the national medium and long-term development planning cycle, guide China's heat treatment industry to develop quickly and well, and specially formulate the “12th Five-Year Plan†for the heat treatment industry. ". Heat treatment industry presents 8 major technology trends 1. Less waste of energy: Adopting energy-saving process measures can do more with less, such as shortening the heating time, lowering the heating temperature, strengthening the chemical heat treatment process, and utilizing the waste heat of the previous process. The specific process has zero insulation heating and uneven austenitizing quenching, and the chemical heat treatment in the ferrite state (<600 ° C) instead of the austenitic state (greater than 850 ° C) chemical heat treatment, from 930 ° C to 1050 °C carburizing, using rare earth and other infiltration agents, using forgings after forging heat quenching, etc. have been promoted and applied. Reasonable selection of equipment has great potential for energy saving. Large furnaces are more energy efficient than small furnaces, and continuous furnaces are more energy efficient than cycle furnaces. Fuel furnaces that make full use of waste heat are at least 50% more energy efficient than electric resistance furnaces. Ceramic fibers and lightweight refractory bricks are lined with reinforced concrete bricks. The heat storage and heat dissipation are much less. The cylindrical furnace reduces heat dissipation by 20% compared with the rectangular furnace, and the heat treatment unit energy consumption is reduced by 7%. The weight of the tray, the basket and the fixture can be reduced by 10-20%. Reasonable organization of production, maintaining the continuity of production, and effective management and monitoring of equipment energy are also very important for energy conservation. 2, no harmful emissions: Advanced heat treatment technology should first be a clean production technology that does not pollute the environment. These include cleaning processes, cleaning equipment and cleaning aids. Controlled atmosphere, vacuum, and inductive heat treatment with good shielding are widely used cleaning processes. Plasma heat treatment, low pressure carburizing, high pressure gas quenching, laser surface strengthening, and spray quenching are also among the less polluting technologies. Vacuum furnaces, atmosphere furnaces, ion nitriding furnaces, natural gas combustion furnaces, and Al2O3 and SiO2 floating particle furnaces corresponding to these processes are non-polluting equipment. PAG polymer quenching agent, non-chlorofluorocarbon solvent, Al2O3 and SIO2 floating particles, nitrogen and various inert gases are cleaning materials. Quenching oil, which is still widely used at home and abroad, is a big problem worthy of attention. At present, there are still many enterprises that directly discharge quenching oil fume to the atmosphere at home and abroad. The China Thermal Association has listed it as a key problem to be solved in the “Eleventh Five-Year Plan†emission reduction plan. At present, several kinds of oil smoke have been treated harmlessly. Methods and facilities for emissions. 3. Less mass dispersion: Due to fluctuations in the chemical composition of the material, the uneven temperature in the furnace, the difference in heating and cooling conditions, and the difference in man-made factors may cause significant differences in the quality of the heat-treated parts of the same heat. The quality is not repeatable. This difference can be minimized with scientific management and advanced technology. One of the 2020 goals of the US Heat Treatment Technology Development Roadmap is to reduce the mass dispersion of heat treated parts to “zeroâ€. In order to achieve this goal, the reliability of the equipment, the precise and stable control of the process parameters, the high uniformity of the furnace gas circulation, the stability of the material composition, the online quality control, and the elimination of human factors are all important issues. In addition, scientific management, ISO9000 certification, raw materials entering the factory inspection, the coordination and connection of the pre- and post-process, the serious implementation of the standard are also closely related to the product quality dispersion. It can be seen that reducing the quality dispersion is a systematic project from technology to management. It must be long-term, meticulous and practical work to achieve good results gradually. 4. Less distortion: Shape and size changes inevitably occur when metal parts are heat treated. Excessive and uneven distortion increases the final finishing allowance and, in severe cases, scraps parts. Parts that are not processed after heat treatment will also lose compatibility due to severe distortion, deteriorate the contact surface, and increase vehicle or machine noise. Minimizing heat treatment distortion has been a lifelong endeavor for many heat treatment experts. One of the goals of the US Heat Treatment Circuit Diagram 2020 is to achieve a "zero" distortion of the heat treated parts. The development of new quenching cooling medium and cooling method, adopting isothermal grading quenching, variable circulation of cooling medium, high-pressure gas quenching, etc., can achieve uniform quenching and cooling of the workpiece, reducing the temperature difference between the surface and the core is widely used in recent generations. Distortion measures. Keeping the chemical composition of the parts and materials and controlling the hardenability steel (H steel) can make the quenching distortion have a stable law, which is convenient for specifying the exact machining margin and selecting suitable less distortion-free measures. 5. Less oxidation-free heating: When metal is heated in air and oxidizing medium, oxidation will cause metal loss, and oxidation will also destroy the surface state and precision of parts and products. The heating of the modern heat treatment is avoided as much as possible in an oxidizing atmosphere, and neutral, inert gas protection, coating is applied or wrapped with stainless steel foil, and heating in a deep vacuum completely avoids oxidation. The induction method with short heating time, salt bath and fluidized bed heating can minimize the oxidation of the metal. A fuel furnace that controls the combustion ratio to a certain degree of reduction can also alleviate the oxidation of the heated metal to a certain extent. 6. Less decarburization: Steel parts are heated in an oxidizing atmosphere such as air, and the surface is oxidized together with the reduction of carbon content on the surface to form surface decarburization. Decarburization will reduce the hardness and wear resistance of steel quenching surface and the tensile stress on the surface to reduce the fatigue life of steel parts. The heating method with little decarburization is basically the same as that of less oxidation, but the process conditions are more severe. In the multi-mixed controlled atmosphere, in order to avoid decarburization, it is necessary to adjust the carbon potential of the furnace gas to match the carbon content of the steel surface. According to this, the decarburized steel piece can also be heated in the corresponding carbon potential atmosphere, in order to restore the original carbon content of the steel. Heating in a deep vacuum does not decarburize, but heating in an inert or neutral gas must result in a water content or dew point that is relatively low (<-60 ° C). In the floating particle furnace, salt bath, deep layer and packaging heating, there is little decarburization effect. Although the induction heat treatment is slightly oxidized, there is no obvious decarburization. 7. No waste and repair products: From the design of parts, the choice of materials, the guarantee of materials, the optimization of processing and process lines, the optimization of processes and equipment by database and expert decision-making system, the guarantee of equipment reliability, process parameters and Quality online control, non-destructive automatic detection system to complete the whole processing and heat treatment process, to achieve the overall quality control of the product, so that the scrap rate and repair products are zero, reaching 100% qualified is not a dream. Strict management, superb craftsmanship, reliable equipment, precise sensing, and precise control of complete system engineering are sufficient guarantees for the production of no scrap and no repair products. 8. Less manual heat treatment: Manual operation is a heavy physical labor in a harsh environment. At present, some developed countries have felt the difficulty of recruiting heat treatment operators. Manual operation can also cause fluctuations in product quality that vary from person to person. Excessive use of labor also increases production costs. Therefore, the automatic production and unmanned operation as soon as possible under the premise of mass production can not be the embarrassment of future heat treatment. Modern enterprises in some developed countries can already witness the miracle of this manufacturing technology. But there must be a correct understanding that no one does not mean no one to monitor. The implementation of unmanned operations must have sufficient technical strength, management level and talent guarantee, normal supply of energy and power, high reliability equipment, sound maintenance, reliable control system, timely alarm, accident self-diagnosis and timely elimination. Nothing. Any mistakes in the link can have serious or even catastrophic consequences. The unmanned production line can only be a natural product in which a country develops to a certain extent and a company develops to a fairly advanced level. Down Pipe Roll Forming Machine Down Pipe Roll Forming Machine,Roll Forming Machine,Pipe Machine Mactec Machinery Co., Ltd. , http://www.hzrollformingmachines.com