挤

The results of prediction agree well with the experimental ones. It proves that the thermo-mechanical analysis、the neural network models of flow stress and microstructure as well as the numerical simulation system developed combining coupled thermal-mechanical rigid-viscoplastic FEM with BP neural networks are reliable to describe the hot back extrusion process of Ti15-3 alloy truly. The simulation system has good prediction capacity for the microstructure evolution of Ti-15-3 alloy during hot backward extrusion and after solution treatment. It can be used to replace the experiments for predicting the flowing laws and the distribution of microstructure.

由此证明，本文的热力耦合理论分析、流变应力及显微组织的神经网络预测模型以及采用三维热力耦合刚粘塑性有限元与三层向后传播的人工神经网络相结合的方法开发的Ti-15-3合金筒形件热反挤成形的显微组织数值模拟系统是可靠的，能够真实地描述Ti-15-3合金热反挤工艺过程，并对其反挤成形及固溶处理后的显微组织具有很好的预测能力，可以被用来代替预测其反挤成形规律和组织分布情况的试验。

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。

The mallet is a grinding stick, crushed to greater food; under the picture with the second row by items with挤汁used, such as a half-cut oranges挤汁; is the next filter, the last used Sassafras carrots and other food, I use it to make a good baby carrots Sassafras.

那个木槌是研磨棒，用来碾碎大些的食物；下排按图片排列第二件物品用来挤汁用，如将橙子切半后挤汁；下一个是过滤网，最后一个用来檫胡萝卜等食物，我用它给宝宝檫胡萝卜很好使。

Soon the sound of Old Pretty's milk fizzing into the pail came through the hedge, and then Angel felt inclined to go round the corner also, to finish off a hard-yielding milcher who had strayed there, he being now as capable of this as the dairyman himself.

不久，从树篱那边传来了老美人的奶被挤进桶里的咝咝声，安琪尔·克莱尔这时候也想到拐角那儿去，以便把跑到那边的一头难挤的奶牛的奶挤完，因为他现在已能像奶牛场老板一样挤难挤的奶牛了。

As compared with other heat preservation materials, XPS Extruded Board has a number of advantages when it is used in formed steel roof heat preservation structures:It makes the steel roof structure more durable thanks to its durability; it prevents cold-bridge of steel roof structure and guarantees against dewing and weeping inside buildings; it meets the requirements of load of different structures and execution of works for its high pressure strength; it meets the requirements of different environments and is suitable for factory buildings with high cleanness requirements for it is cleam and does not produce any dust thanks to its compactness of texture.

和其它的保温材料相比，挤塑板用于压型钢板屋面保温构造有着诸多优点：挤塑板的持久性使钢结构屋面持久耐用挤塑板用于钢结构屋面可以避免冷桥发生，保证建筑物内部不结露不滴水；挤塑板的抗压强度可适应各种结构及施工的荷载要求；挤塑板材质紧密、洁净而不产生粉尘，能适应各种环境的要求，亦适合净度要求高的厂房

The object of the aetioporphyrin risk analysis is a time sex usage the 滤 divided by the leuco - cell blood transfusion the 器, its cardinal be used by cure order PVC, ABS, PE gramulate and have no the machine fiber spoilage the iso - to pass by the 挤塑, note the 塑, assemble the iso - craft to make into.

本风险分析的对象是一次性使用滤除白细胞输血器，其主要由医用级PVC、ABS、PE粒子以及无机纤维材料等经过挤塑、注塑、组装等工艺制成。

The calculating results are compared with the test data in available literatures and FEM results. The research results show that the plastic hinge model is precise and correct, which can satisfy with the actual engineering demands. The collapse pressure of perforated liner casing decreases with phrase angle, initial ovalization and diameter-thickness ratio increasing, and increases with the yield stress. The phrase angle and initial ovalization have greatly influence on the collapse pressure. The collapse pressure of perforated liner casing is slightly changed with the diameter and density of perforation when the diameter and density are smaller than 12mm and 120 shots per meter, respectively.

计算结果表明：筛管抗挤强度的塑性铰模型具有很高的计算精度和准确度，可以满足工程实际需要；筛管抗挤强度随着射孔相位角、径厚比和初始椭圆度的增加而降低，随着屈服强度的增加而增加，相位角和椭圆度对筛管抗挤强度影响比较显著；在射孔直径小于12 mm、射孔密度小于120 孔/ m 时，筛管抗挤强度随射孔直径和射孔密度增加变化不明显。

Through analyzing the properties of PVC extruded materials,the main factors causing the colouration of PVC extruded product were investigated.

通过对PVC挤塑材料性能的分析，探讨了影响PVC挤塑制品着色的主要因素；从原材料及加工过程的特点，寻找控制着色产品色泽的主要因素；认为对材料的配方及配混工艺、挤塑加工工艺进行严格控制，是控制好PVC挤塑制品色泽的主要途径。

Double deck Co-extrusion plastics decorative board with soft surface layer;2. Adjustment of the co-extrusion tooling is very important for producing high-quality colored co-extrusion plastic profiles.

塑料异型材表面彩色复合共挤在国内日益兴起，对该类挤出模具的调试是获得满意共挤出异型材的关键之一，现结合共挤模具，探讨了共挤工艺参数的设定、共挤层厚度的控制、共挤层表面质量的控制、共挤层与基材的粘结强度等共挤出模具的调试技

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。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷