坯

When the powder loading was fixed as 58%,the molded compact of a gearwheel whose addendum circle diameter is 700 μm was obtained with well shape retention.

3μm的羰基铁粉和石蜡基热塑性粘结剂体系，当粉末的装载量为58%时，获得了形状良好的齿顶圆直径为700μm的微型齿轮注射生坯。

Please click on the Adobe button below to download it to your computer.

请点击下面的按钮坯体给你的电脑下载。

The three-roll planetary rolling process of copper alloy tube was simulated and analyzed by finite element method .

目前三辊行星轧制紫铜管坯的技术已相对成熟，而利用三辊行星轧机轧制铜合金管坯的实验和研究却相对很少。

The forcasting value of the simulation was approved by experiment results. So the finite element method can be used on other kinds of copper alloy tubes in three-roll planetary rolling process.

相应实验结果证明铜合金管坯有限元模拟具有很好的仿真预测价值，并可用于探索其它类型铜合金管坯旋轧成形规律。

Compared with the three-roll planetary rolling process, the bending stress of the tube decreases greatly during the four-roll planetary rolling process, reducing the possibility of the generation of cracks.

与三辊行星轧制相比，四辊行星轧制管坯的反复弯曲应力显著减小，进而大大减小了在管坯表面形成裂纹的可能性。

In order to use the existing production conditions sufficiently, by the quality control of the continuous-casting billet and hot sending process and the cooling process after rolling, especially the process controlling of Hot-Continuous-Rolling, realizing the small reduction ratio Hot-Continuous-Rolling production technics to produce big size steel stick upwards Φ 120mm using rectangular continuous-casting billet of 235 X 265mm, the lowest limit of 6.00 used in China currently is broken.

为了充分利用现有生产条件，通过控制连铸坯质量、热送和轧后冷却过程的控制，尤其是热连轧过程的优化控制，实现了235×265mm矩形连铸坯生产Φ120mm以上大规格棒材，热连轧压缩比突破了国内一般采用的6.00这个下限。

While superheat is decreased, the shell thickness increases down along strand especially at the corner of the section, and the macrosegregation become more serious under columnar dendritic solidification.

当过热度降低时，可增加注流铅程尤其是铸坯角部凝固坯壳厚度；在完全为柱状晶生长方式下，降低过热度加剧了宏观偏析。

Wheat straw, thermosetting resin, alcohol ,etc, were selected as raw materials and Zncl2, K2CO3,(NH4)2HPO4 and Na2B4O7·10H2O as additives. All these components were mixed uniformly according to the proportion and hot-pressed to sample with the dimension. The samples were put into the vacuum furnace and sintered in the atmosphere of nitrogen ,and the termination temperature was 300℃, 400℃, 500℃, 600℃, 700℃ and 800℃, respectively, and woodceramics were prepared and the effects of the additive on the ratio of remaining carbon were investigated.

试验选取了麦秸、热固型酚醛树脂、酒精等为原料，氯化锌、碳酸钾、磷酸氢二氨以及硼砂等为阻燃剂，按照一定的比例混合均匀并热压成一定尺寸的坯体，再将坯体在氮气保护下按两种升温模式分别烧结至300℃、400℃、500℃、600℃、700℃和800℃，制备出各温度点下的木质陶瓷，观察分析了阻燃剂对其残碳率的影响。

This paper introduces automatic production line for isothermal normalization with residual heat from forged steel parts and installed computer distributed control system,(which can be used for heating up gear billet and normalizing isothermally for the second time)developed by our company,which form a complete set with AMP70 hot former made in Switzerland.

介绍了我厂研制的与引进瑞士AMP70热镦机配套的具有计算机集散式控制系统的锻坯余热等温正火自动生产线(可兼作二次加热齿坯等温正火)。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了