共查询到20条相似文献,搜索用时 62 毫秒
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针对立式带钢连续退火炉内辐射管加热过程带钢温度均匀性问题,建立了W型辐射管管内流动、燃烧和管内外换热的耦合模型以及带钢内部非稳态导热模型,模拟研究了辐射管表面温度分布对带钢温度均匀性变化的影响。结果表明,在带钢升温过程中,其宽度方向温度呈凹状分布,这与辐射管两端温度偏高和炉墙的辐射绝热作用有关,该温差先增大后逐渐减小,宽度1200 mm的带钢在加热中段时最大温差可达13.6℃;带宽方向温差随着带宽的增大先缓慢增大后快速降低;带宽较小时,带宽方向温差随着功率的增加而增大,带宽较大时则相反。带宽接近辐射管长度时,带宽方向温差最小,可降至5℃以内;加热前期,辐射管表面温度最不均匀,加热中期,带宽方向温差最大。 相似文献
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在铝合金加热炉上采用远红外辐射加热技术在铝合金生产工艺中,铸锭加热是不可缺少的关键工序,要求加热快速、均匀和节能。我厂将远红外加热技术应用于铝合金加热炉上,模拟实验后在生产上已试用过,收到较好的效果,现介绍如下。远红外辐射元件的研制远红外辐射元件就是... 相似文献
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本文简要介绍了中厚板热处理炉的分类及其炉型特点、热处理生产线配套设施、中厚板热处理线发展趋势. 重点介绍了辊底式炉和步进梁式炉的优缺点、连续式热处理炉加热方式的选择、辐射管加热无氧化辊底式炉技术、辊压式淬火机及快速冷却装置的特点. 相似文献
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综合感应加热淬火和压淬工艺的优点,推出了一种新的模压式感应淬火回火技术。该技术的工艺路线是零件感应加热后直接采用模具压力淬火,然后进行原位感应加热回火,这样使得模具的退出很容易而且几乎没有磨损。该技术的主要装备是拥有模压式淬火装置以及感应加热系统的新型淬火机床。它适用于任何高精度圆环形零件的批量生产,如汽车滑套、齿圈、同步圈、伞齿轮、耦件等。 相似文献
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丁守祥 《热处理技术与装备》2003,24(2):43-43
一项联合研究计划开发出一种计算机控制的流态床炉 ,它有内燃烧气与浸没的电辐射管结合加热系统。可同时使用该系统的两部分或择用其一。流态床处理的能效率是考虑的首要问题 ,因为热损失一般认为是这种工艺的主要缺点之一。然而 ,该系统的热平衡类似于大致相同尺寸的盐浴炉(5 0 0~ 6 0 0mm ,配耐热外壳的坩埚 )。新系统值得重视的优点是改善了它在各种生产条件下的机动性 ,以及系统两部分同时运行时具有高的加热速率。在低温下电和气体结合加热是突出的优点 ,由于快速减少辐射管附近流态化氧化铝的粘度 ,从而产生更均匀的燃烧以及更好的热… 相似文献
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为了进行光亮退火、渗碳、碳氮共渗与粉末烧结,研制成可变碳势(Variocarb)热处理工艺,以制备可控气氛。此工艺特别适用于辐射管加热的连续式炉型。将炉中的一根辐射管改装成图示的吸热式分裂反应器。在1000℃左右,天然气与空气在催化剂作用 相似文献
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Z. Sun S.L. Zheng Y. Zhang 《金属学报(英文版)》2007,20(3):187-192
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. 相似文献
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R. González-Martínez 《金属学报(英文版)》2007,20(4):235-240
The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke. 相似文献
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Deng-Kui Zhang Guo-Qing Wang Ai-Ping Wu Ji-Guo Shan Yue Zhao Tian-Yi Zhao Dan-Yang Meng Jian-Ling Song Zhong-Ping Zhang 《金属学报(英文版)》2019,32(6):684-694
In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone. 相似文献
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After nearly two years'tense construction the first phase of industrialized base of Shenyang Research Institute of Foundry 《中国铸造》2008,5(1):63-64
After nearly two years' tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry (SRIF), located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation. 相似文献
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综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。 相似文献
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B.W. Zhang B.W. Li 《金属学报(英文版)》2007,20(2):129-138
On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes' collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process. 相似文献
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R.Z. Wu Z.K. Qu B.D. Sun D. Shu J. Wang 《金属学报(英文版)》2007,20(3):193-198
The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results. 相似文献
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VINOD KAPUR 《中国铸造》2014,(5)
正I take great pleasure in congratulating CHINA FOUNDRY journal on its 10th anniversary.The CHINA FOUNDRY journal started ten years ago.Since its inaugural,China has seen exceptional growth in the Castings Sector and rapid development in Machinery Industry.The journal is becoming an important communication platform for experts 相似文献
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《机床与液压》2014,(12)
正Harbin General Hydraulic Machinery Works Co.,Ltd.of Yilin Hydraulic Group is the most professional production base of large-scale metallurgy oil cylinder and oil machinery cylinder in the Northeast of China.The main products include metallurgy cylinder,swell-shrink cylinder,rotating injection device,lifting cylinder,main lifting jack,front lifting jack,engineering oil cyl- 相似文献
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《机床与液压》2014,(12)
正Weihai HHH Mach.Elec.Group is the most technical company focusing on Power transmission and Hydra-controlling.HHH has the ability of developing and testing of complete sets of transmission system with relevant technical training.HHH provide efficient,excellent cost-effective power transmission system and intelligent electric fluid transmission and control system to OEM customers,who are 相似文献