干法熄焦和稳定熄焦

对干法熄焦和稳定熄焦的技术特点和优势进行了分析比较。指出：干法熄焦回收占焦炉能耗的35％～40％的红焦显热是稳定熄焦所不具备的优势;干法熄焦改善焦炭质量是稳定熄焦所无法比拟的;干法熄焦在减少对环境污染方面显著优于稳定熄焦;各国能源情况和能源价格的差异决定了这些国家选择哪一种熄焦方式。     

Heat Transfer During Quenching by Plate Roller Quenching Machine

For plate quenching on a roller quenching machine, heat transfer process is investigated. According to the practical online experiment of plate center temperature, average heat transfer coefficient under different conditions and temperature fields are analyzed by numerical simulation. The results show that, at the water temperature of 15 ℃, the instantaneous maximum quenching cooling rate is 17.6 ℃/s for the plate of 50 mm in thickness in roller quenching process. In the temperature range of 400-850 ℃, the maximum is 12.1 ℃/s. With the plate surface temperature decreasing, surface heat transfer coefficient increases at first, and reaches the maximum value of about 15 000 W/(m~2·K), and then decreases. The calculated heat transfer coefficients are applied to analyze plate temperature field of different thicknesses, and the difference between the calculated and measured temperature is less than 5%.     

高性能淬火在最小的空间内获得最大的性能

近年来,对挤压淬火的的需求变的更加迫切。有三个主要因素促进了这些需求:更快的挤压速度,初出区域长度的限制以及因更快的淬火率而得到的型材性能的改进。这三个因素造成了对在最小空间内获得最大淬火性能的需求。本文研究分析了使淬火过程最优化的方法并详述了利用这些方法的淬火设计。     

芯棒淬火设备

芯棒是轧管必备的工具之一,有着比较复杂的生产工艺。描述了目前国内芯棒淬火的现状、介绍了天津赛瑞机器设备有限公司设计芯棒淬火设备的背景、设备的结构及工作原理。     

甲板压淬热处理中淬火压床的设计

甲板的热处理技术是将甲板加热到一定温度后,对甲板进行喷水冷却处理.根据目前甲板热处理设备的现状分析了淬火压床系统的结构及工艺的缺陷,对淬火压床系统进行结构及加工工艺优化设计,使压头及框架结构趋于合理,保证了甲板淬火后平面度达到生产工艺要求,经过近几年的使用,取得了良好的效果.     

中厚板辊式淬火机淬火工艺自动控制系统开发及应用

为满足中厚板热处理线高强度板材产品的淬火工艺开发需要,通过构建基础自动化和过程自动化两级控制系统,自主开发出中厚板辊式淬火机淬火工艺控制系统。基础自动化用于满足淬火机的顺序控制、逻辑控制及设备控制功能,工艺过程控制用于实现淬火工艺参数的模型计算及设定,实现了中厚板辊式淬火机淬火过程的自动控制。将该工艺系统用于中厚板淬火工艺开发及生产,淬火后板材平直度及性能指标达到或优于国外同类进口先进设备的工艺技术水平。     

压力淬火工艺研究

美国格里森淬火压力机对部分伞齿、盘齿类零件淬火变形起到了极大的作用。现阶段存在部分零件淬火变形较难控制的情况,本文摸索此类零件的热处理变形规律及热处理工艺,同时研究淬火压床的结构及各部位压力、淬火模具的设计理念,有效的控制零件淬火变形,提高产品质量。     

Atomized Spray Quenching as an Alternative Quenching Method for Defined Adjustment of Heat Transfer

In Atomized Spray Quenching, water is atomized to a fine spray by compressed air and sprayed onto the hot metallic surface. On the surface, the single drops partially evaporate. Afterwards they are taken away by the superposed airflow. Thus a water film cannot form. By quenching one edge, it is shown that an undefined water film collapses at the edges and corners; roughness, as known from Water Spray Quenching, does not occur. In this way a defined adjustment of heat transfer including quality improvement is possible. The influence of impingement density, spray characteristics, drop velocity, drop diameter and surface temperature on heat transfer was investigated. The heat transfer was measured with infrared thermography. The spray characteristics were measured with a combination of 2D‐Phase‐Doppler‐Anemometer and Patternator. Heat transfer coefficients up to 3000 W/(m² K) were measured.     

重轨轨头淬火应力场的计算机模拟

利用有限元法研究了重轨轨头在淬火过程中的应力场分布。模拟计算的过程中利用等效热容法处理相变潜热对温度场的影响,用等效线膨胀系数法处理相变引起的组织应力,同时考虑了材料的非线性参数对温度场的影响。研究结果表明温度的模拟结果与实测结果吻合较好,喷风淬火可以产生较小的残余热应力,避免了钢轨的变形和开裂。     

干湿法熄焦对焦炭强度影响的对比分析

通过测定焦炭强度和水分 ,对干法熄焦和湿法熄焦对焦炭质量的影响进行了对比分析。结果表明 :干熄焦炭提高了成熟度 ,减少了微裂纹的产生 ,改善了内部结构 ,其抗碎强度 M40比湿熄焦炭提高了 6% ,焦炭水分降低 5 %。     

Flow Uniformity of Roller-Type Quenching Machine

 Abstract: Three dimensional finite element flow field model of spraying pipe of roller-type quenching machine is built. The flow field under different structural parameters is computed. After grouping the nozzles, the spraying uniformity is analyzed under different water inlet pipe diameter, different water inlet pipe distance, nozzle diameter, nozzle distance. And the spraying intensity absolute deviation and relative deviation are computed under different conditions. The effect rule of different structural parameters to cooling uniformity is obtained. The results provide theoretical support for improving production quality and optimizing cooling device design.     

Quenching of chlorophyll fluorescence by quinones

Obese (Lepr(fa)/Lepr(fa)) Zucker rats have a missense mutation in the leptin receptor gene. One amino acid substitution in the extracellular domain common to all known leptin receptor proteins results from this mutation. Obese Zucker rats are unable to respond behaviorally to leptin which is peripherally administered. However, conflicting reports exist on whether obese Zucker rats can respond to centrally administered leptin. The purpose of this study was to determine whether obese Zucker rats responded behaviorally and metabolically to intracerebroventricularly (i.c.v.) administered leptin and to compare the responses of lean and obese Zucker rats. We found that both lean and obese Zucker rats had similar body weight and food intake responses when administered a single i.c.v. leptin injection in a range of doses (1.25, 2.5, 5, and 10 microg), as well as daily i.c.v. administered leptin for five consecutive days. Both single and daily leptin administration also decreased respiratory quotient (RQ) similarly in lean and obese Zucker rats, indicating mobilization of fat as an energy source for leptin-treated rats. After withdrawal of daily leptin treatment, lean and obese Zucker rats exhibited different recovery responses. It is concluded that obese Zucker rats can respond to exogenous leptin when leptin is delivered into the brain ventricles.     

快速冷却和直接淬火技术

本文剖析了法国ＢＥＲＴＩＮ＆ＣＩＥ在线快速冷却（ＡＣＣ）和而后发展的直接淬火（ＤＱ）技术，提出舞钢轧钢厂把ＡＣＣ和ＤＱ装置作为线热处理线主要设备的设想和要解决的问题。     

PR-500中频淬火变压器的研制

中频淬火变压器用于工件的透热、淬火、退火、弯管钎焊等工艺.主要缺点是该变压器投入工作时温度升高,绕组和铁心中均需要放置铜管通过循环水进行冷却,以保证变压器在允许温度条件下正常运行,中频淬火变压器的制造工艺较为复杂.     

Quenching the thirst in dialysis patients

OBJECTIVE: To review the results of the operative treatment of posterior urethral injuries in children. PATIENTS AND METHODS: A total of 29 children (25 boys and two girls, age range 3-14 years) with injuries to the posterior urethra were admitted to this department over 14 years. Twenty-three patients presented immediately after trauma and six were referred after unsuccessful attempt(s) at surgical repair. RESULTS: Fourteen patients underwent suprapubic diversion and primary realignment over a catheter. Urethral continuity with normal urinary continence was achieved in seven of these patients. Four patients underwent a re-operation; urethral reconstruction was successful in these patients, but one patient remained incontinent. Primary realignment with anastomosis was performed in nine patients; the results were satisfactory in six. Urethral stricture developed in all of four patients who were managed with a suprapubic cystostomy alone; a staged repair using the transpubic approach was carried out in two of them and one improved. Partial urethral tears in two patients healed with urethral catheterization alone. CONCLUSION: Primary realignment of the urethra with anastomosis and suprapubic diversion resulted in the highest rate of success for normal urethral continuity. Urethral strictures or urinary incontinence were not major problems in this group. Therefore, we recommend this approach for the initial management of urethral injuries in childhood. Transpubic urethroplasties may be reserved for secondary repair.     

干熄焦钢结构的防腐

对济钢干熄焦工程钢结构重新进行防腐处理 ,采用环氧树脂系列涂料作底层 ,丙烯酸聚氨酯涂料作面层 ,经合理设计方案 ,严格规范施工 ,达到了预期效果