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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Contact type customized strength selective cooling equipment for ultra-high strength steel Chen Jiaheng, Li Xianjun, Luo Ping Heat Treatment of Metals    2023, 48 (7): 292-296.   doi:10.13251/j.issn.0254-6051.2023.07.049 Abstract （36）      PDF （1922KB）（125）       Knowledge map    In response to the problems of wide transition zone width and unclear cooling boundary in the workpiece treated by the existing jet type customized strength heat treatment selective cooling equipment, a contact type customized strength heat treatment selective cooling equipment has been developed through a series of experimental verification and structural optimization design. The results show that the equipment can significantly reduce the width of the transition zone (30 mm→10 mm) by conducting heat transfer through contact between the insert and the plate, with clear cooling boundaries, and can better meet the needs of special soft areas. Reference | Related Articles | Metrics Select Automatic material equipment for heat treatment Zhang Zhipeng Heat Treatment of Metals    2022, 47 (10): 251-257.   doi:10.13251/j.issn.0254-6051.2022.10.043 Abstract （38）      PDF （652KB）（37）       Knowledge map    Automatic material equipment plays an important role in preventing mixing, reducing labor intensity, ensuring the quality of heat treatment and improving the degree of heat treatment automation. The characteristics, application conditions and practical application effects of automatic material equipment such as material conveying equipment, material storage equipment and material layout and collection equipment are introduced. It can provide assistance to heat treatment employee in the planning of heat treatment plants. Reference | Related Articles | Metrics Select Design, development and application of automatic coating equipment with anti-carburizing paint for input shaft Xia Xiaoyu, Fan Xin, Wei Hanwei Heat Treatment of Metals    2022, 47 (9): 286-292.   doi:10.13251/j.issn.0254-6051.2022.09.048 Abstract （68）      PDF （630KB）（42）       Knowledge map    A special automatic equipment for input shaft coating with anti-carburizing paint was designed and developed with good reliability, controllability, reproducibility, repeatability, safety and repairability. And a complete coating process was developed. After repeated verification, it meets the technical requirements of the anti-carburizing range and has good performance for reproducibility. Reference | Related Articles | Metrics Select Temperature measurement method of autoclave for nuclear industry Yu Zeli, Fang Yongqiang, Bai Xinfang, Yu Sen, Zhang Shuxiang, Duan Guan Heat Treatment of Metals    2022, 47 (8): 301-306.   doi:10.13251/j.issn.0254-6051.2022.08.050 Abstract （58）      PDF （393KB）（25）       Knowledge map    An on-line calibration device was designed to calibrate the temperature uniformity, axial temperature field, radial temperature field and temperature stability of the autoclave, the size of the effective heating area of the autoclave was determined, the source of the measurement result uncertainty of the temperature uniformity of the autoclave was analyzed, and the uncertainty evaluation method was determined. The reliability of the calibration results was verified by comparison with several laboratories. The results show that the calibration tooling used is reasonable and practical, which fundamentally solves the problem of high-pressure high temperature on-line calibration. The comparison results of several laboratories are satisfactory and meet the production needs. Reference | Related Articles | Metrics Select Design and fluid-thermal coupling of a strong quenching tank with double vortex flow field Qu Zhe, Zhu Xiaoshuo, Xing Ruofei, Fu Yudong Heat Treatment of Metals    2021, 46 (11): 262-269.   doi:10.13251/j.issn.0254-6051.2021.11.048 Abstract （61）      PDF （670KB）（23）       Knowledge map    In view of the lack of strong quenching equipment with uniform, high-speed and stable flow field, a physical model of quenching tank of strong quenching equipment with double vortex flow field was designed. The fluid mechanics analysis was carried out by using Fluent software, and the internal flow field of quenching tank of strong quenching equipment was studied. Based on the three-dimensional Reynolds average conservation N-S equation and the standard k-ε turbulence model, the flow field generated in the quenching tank was numerically calculated with the water inlet velocity of 3.0, 3.5, 4.0 m/s. The temperature field for specimen of 0.45% carbon steel in the quenching tank was calculated by the fluid-thermal coupling analysis. The results indicate that the liquid phase medium flow forms a double vortex fluid field in the quenching tank and a circulation field around part forms with high speed and stable flow. For the optimal process, the speed of the circulation field is 2.0 m/s when the water inlet speed is 4.0 m/s. This speed makes the cooling rate of 650 ℃/s for 0.45% carbon steel specimen, which fully meets the requirement of strong quenching. Reference | Related Articles | Metrics Select Design and application of a diversion structure for high precision plate aging furnace Gao Yufeng, Gao Ruchao Heat Treatment of Metals    2021, 46 (7): 258-260.   doi:10.13251/j.issn.0254-6051.2021.07.050 Abstract （56）      PDF （599KB）（22）       Knowledge map    In order to meet the temperature uniformity requirements of a high precision plate aging furnace, a diversion structure was added, of which the structure parameters were optimized by numerical simulation method, and then the temperature uniformity test of the aging furnace was carried out on the basis of the simulation results. The results show that using the optimized diversion structure can improve the temperature uniformity of the aging furnace within ±1.5 ℃, and the simulation results is consistent with the measurement result showing that reasonable setting diversion structure can achieve the requirements of the temperature uniformity of the aging furnace. Reference | Related Articles | Metrics Select Development of walking beam production line for isothermal normalizing of gear shaft blanks Luo Ping, Li Xianjun, Zhang Wenliang, Wang Jin, Wu Xiaolin, Shang Yong, Shi Yuezhang Heat Treatment of Metals    2021, 46 (4): 243-246.   doi:10.13251/j.issn.0254-6051.2021.04.047 Abstract （67）      PDF （592KB）（42）       Knowledge map    An intelligent walking beam isothermal normalizing production line was developed for gear shaft blanks, and the measures adopted in the line to realize the “green”, “precision” and “intelligence” characteristics were introduced in details. The production practice in the past two years shows that, the heat treatment production line has the advantages of stable mechanical operation, fast heating, uniform heating and cooling for workpieces, saving energy and reducing consumption, and high degree of automation. After the normalizing treatment by this production line, the gear shaft blanks own fine and uniform ferrite+pearlite microstructure, which plays a good foundation for the subsequent carburizing and quenching processes. Meanwhile, the moderation and small dispersion of hardness values are beneficial for the improvement of machining. Reference | Related Articles | Metrics Select High pressure gas quenching equipment and technology Pan Zhen Heat Treatment of Metals    2021, 46 (4): 247-249.   doi:10.13251/j.issn.0254-6051.2021.04.048 Abstract （79）      PDF （590KB）（53）       Knowledge map    Characteristics of gas quenching medium and gas quenching equipment of ECM were briefly introduced. At the same time, the principle of step gas quenching process of ECM and the advantages of step gas quenching process over ordinary gas quenching process were introduced and discussed by combining with actual production cases. Reference | Related Articles | Metrics Select Design and operation of supervisory control system for CSMC heat treatment Li Tong, Wu Yu, Li Fangyi, Wang Weijun Heat Treatment of Metals    2020, 45 (11): 255-259.   doi:10.13251/j.issn.0254-6051.2020.11.049 Abstract （55）      PDF （577KB）（20）       Knowledge map    Superconducting properties of the Nb3Sn material only show up after heat treatment, and during the heat treatment process, the temperature of magnet, the gas pressure and the mass flow rate of gas should be monitored. So based on EPICS, a supervisory control system has been developed, and enterprise-level Web technology is applied to the system. After years of commissioning and operation, the CSMC heat treatment process of Nb3Sn outside and inside coil has been successfully performed. Reference | Related Articles | Metrics Select Numerical simulation of floating heat transfer process and structure optimization of air cushion furnace Zhang Jiayuan, Li Ping, Zeng Qi Heat Treatment of Metals    2020, 45 (9): 248-256.   doi:10.13251/j.issn.0254-6051.2020.09.047 Abstract （73）      PDF （558KB）（29）       Knowledge map    Air cushion furnace is a kind of advanced equipment for heat treatment of thin aluminum alloy sheet.Based on the structure of air cushion furnace designed by an aluminum factory,a three-dimensional calculation model of the whole air cushion furnace was established.And floating heat transfer process of sheet in this furnace was simulated by means of fluid-solid coupling FSI analysis method.The results show that the heat transfer in the furnace is basically uniform,but the downward distortion of the sheet is too large to achieve normal floatation.In order to reduce the sheet distortion,orthogonal experiments were used to optimize the nozzle layout parameters of the air cushion furnace in the optimum space,and the structure parameters of the air cushion furnace diversion device were optimized based on response surface and genetic algorithm.The results show that the air flow and pressure distribution on the upper and lower surfaces of the plate are more reasonable after optimization.The distortion of the sheet in the furnace is reduced from 110.3 mm to 41.4 mm,and the floatation of the sheet is realized. Reference | Related Articles | Metrics Select Optimal design of quenching fixture for multi-arc head used in aerospace Lin Lei, He Feifei, Lin Gang, Chen Yong, Ran Haijun Heat Treatment of Metals    2020, 45 (9): 257-261.   doi:10.13251/j.issn.0254-6051.2020.09.048 Abstract （51）      PDF （563KB）（32）       Knowledge map    Quenching treatment method for a multi-arc head parts used in aerospace products was developed.Through the finite element analysis,the thermal tend for the multi-arc head under the constraint of the bottom was studied.The 3D model of the multi-arc head quenching fixture was established,and the basic structure of the multi-arc head quenching fixture was introduced.The results of thermal distortion distribution for the multi-arc head under the constraint of quenching fixture are obtained by the finite element analysis(FEM).The FEM results show that the total distortion of multi-arc head is 16.0 mm,in Z direction is 15.0 mm,and in X direction is 8.5 mm.Through the analysis of the local thermal distortion of the multi-arc head quenching fixture,the optimal design scheme of the quenching fixture is proposed.The thermal distortion distribution of the multi-arc head is optimized.The total distortion is 7.0 mm,in Z direction is 10.0 mm,and in X direction is 3.0 mm.The problem for large distortion of the multi-arc head heat treatment is solved and verified by production. Reference | Related Articles | Metrics Select Design and application of high precision temperature control system for vacuum low-pressure carburizing furnace He Longxiang, Yin Chengkun, Xu Yueming, Cong Peiwu, Liu Junxiang Heat Treatment of Metals    2020, 45 (8): 249-253.   doi:10.13251/j.issn.0254-6051.2020.08.048 Abstract （226）      PDF （529KB）（151）       Knowledge map    A monitoring system of vacuum low-pressure carburizing upper computer was designed based on Kingview 6.55 software. Through modbus communication between Kingview software and Yamatake instrument DCP31 and using the 2-DOF PID function of the instrument, real-time PID correction was carried out to ensure the accuracy of temperature control. Variables in carburizing process, such as flow control of C2H2and NH3 and N2, carburizing diffusion time, pulse number, holding time and quenching mode, were solidified into formulation form for users to call and modify. The design and application of this software platform reduce the mis-operation and complexity of the operators, and greatly improve the heat treatment quality of low pressure carburizing. Reference | Related Articles | Metrics Select Development of non-standard immersion quenching equipment for aluminum parts Luo Ping, Shi Yiqing, Li Xianjun, Zhang Wenliang, Zhou Tong, Sun Meng Heat Treatment of Metals    2020, 45 (4): 236-241.   doi:10.13251/j.issn.0254-6051.2020.04.049 Abstract （68）      PDF （3097KB）（47）       Knowledge map    The principles of quenching process of aluminum parts, potential problems of aluminum parts in the quenching process and the relationship between heat transfer coefficient and temperature as well as the cooling velocity of quenchant were introduced. And a scientific basis of immersion quenching equipment of aluminum parts for customization was provided. Finally, several typical engineering examples are analyzed based on some critical issues during the design and industrialization, which are selected from dozens of cases of immersion quenching equipment of aluminum parts. Therefore, the solutions to reduce distortion under the premise of ensuring the expected performance of aluminum parts during quenching are clarified. Reference | Related Articles | Metrics Select An electric spark strengthening and repairing device for planar surface Ge Zhihong, Deng Jing Heat Treatment of Metals    2020, 45 (4): 242-244.   doi:10.13251/j.issn.0254-6051.2020.04.050 Abstract （65）      PDF （1019KB）（34）       Knowledge map    An electric spark strengthening device for metal planar repairing was studied. Through SEM analysis, MM200 wear test and hardness gradient distribution analysis, the strengthened repairing layer obtained by the device is relatively complete and has a certain thickness, which greatly improves the hardness and wear resistance of the part surface. Reference | Related Articles | Metrics