preform

Desirable infiltration results can be obtained to fabricate A12O3/ A1 composite by means of both laying alloy on perform and pressing preform into alloy.

采用合金上置法和模块压入法制备A12O3从复合材料皆可获得比较理想的浸渗效果。

Taking C/ C composites of different structure and density as preform, C/ SiC composites were prepared by reactive melt infiltration. The relationship among density, component content, thermal diffusion coefficient and friction properties of C/ SiC composites was studied.

以不同结构类型及密度的C/C复合材料为预制体，采用反应熔体渗透法制备了C/SiC复合材料，研究了不同结构C/SiC复合材料的密度、组分含量、热扩散系数与摩擦性能相互之间的关系。

Effect of Preform on Properties of C/ C Sealing Materials

预制体对C/C密封材料性能的影响

The optimization preform shape checked by forward operation and the results show that the variation of effective strain trend to uniform, the forming force and the effective stress are decreased. 4 、 The study of multilayer metal die.

通过对优化结果进行检验，可以看出优化后的模型变形更加均匀，使得终锻模的等效应力和成形所需的动力均有所减小。4、多层金属热锻模的研究。

Optimal Preform Die Shape Design through Controlling Deformation Uniformity and Deforming Force in Metal Forging

控制锻件变形均匀性和变形力的锻造预成形多目标优化设计

Condensate will leave marks on the preform surface.

露水会遗留痕迹在瓶坯的表面上.

Bottle weight , which is the same as preform weight, is essentially non-adjustable.

瓶子的重量(壁厚)相当于瓶坯的重量, 而后者基本上不能调整.

The modification of beam deflective method for measuring refractive index profile of a fiber preform

测光纤预制棒折率射分布的光束偏折法的改进

Finite element simulation of hot die forming and optimization design of preform for a blade with large-angle crankle

大弯扭叶片热模压成形有限元模拟及其预制坯的优化设计

A mandrel mill hydraulic screwdown control was successfully established at Wakayama Steel Works of Sumitomo Metal Industries, Ltd, in 1985. The control is used to preform tube ends into a thinwalled taper during rolling.

一套连轧管机油压压下控制系统于1985年在日本住友金属公司和歌山钢铁厂使用成功。此控制系统用于在轧制中控制管端，使管端减壁形成圆锥体。

An algorithm of three-dimensional braided composite material preform image processing based on mathematics morphology is presented.

提出一种基于小尺度的数学形态学的三维编织复合材料预制件图像的边缘检测方法.

Major in PET preform mould, cap mould and blow mould.

专业生产瓶坯模具, 瓶盖模具和吹瓶模具.

Study on Densification Mechanism of Unidirectional Carbon Carbon Composites by Chemical Vapor Infiltration DENSIFICATION MECHANISM OF PREFORM WITH THERMAL GRADIENT CVI

单向碳/碳复合材料的化学气相渗透特征热梯度化学气相沉积动力学过程的探讨

Precise preform loading system in order to minimize failure rate.

高可靠性的进坯、上坯、出坯系统、使吹瓶机故障率降到最低.

The prepared C/ CF reinforced Cu matrix composites with good sound interface and higher tensile strength may be obtained, preferably with C/ CF wire preform in 40~ 60 μ m copper plating thickness.

在C/CF先驱丝表面镀铜厚度为40～60μm，有助于制备界面结合良好和抗拉强度较高的C/CF/Cu基复合材料。

Most preform moulds are rectangular and are longer than they are wide.

大多数的瓶坯模具呈长形,就是长度比阔度大.

Cooling time dominates cycle time in thick-wall moulding like preform moulding.

属厚壁注塑的瓶坯，冷却时间支配着周期时间。

The processing influence on the mechanical properties of silicon carbide matrix composites is reviewed, which includes fibers and preform formation, high temperature treatment, interface technology, matrix densification and post treatment.

介绍了纤维及预制体成型、高温处理、界面技术、基体致密化及后处理等工艺因素对碳化硅基复合材料机械性能的影响。

An 8-cavity preform mould costs more than the injection moulding machine that holds it.

八腔以上的模具价钱比注塑机还要高.

The improvement of adding titanium for molten copper infiltration into the C/ C composites preform results from the improvement of the chemical and physical adsorption characteristic of copper on the composites.

添加钛元素能改善C/C复合材料渗铜性能的主要原因是改善铜在C/C复合材料中的化学吸附和物理吸附特性；

Knowledge on plastic material and quality control on preform manufacturing.

具备塑料和瓶胚生产品控的知识.

Two Methods: Used to liquid impregnate carbon fiber preform are introduced.

介绍了液相浸渍炭纤维坯体的两种方法.

The fabric is used as preform for thermoplastic textile-reinforced composite modules.

这种织物被用作热塑性纺织增强复合材料模件的预型件.

Densification mechanism of preform with thermal gradient CVI

热梯度化学气相沉积动力学过程的探讨

In the injection stretch blow moulding process, injection moulding machine is used to make the preform.

注拉吹工艺先用注塑机注出瓶坯.

A preform shape can be gained with backward simulation from the final bladeshape based on FEM.

为此,本文介绍了有限元反向模拟的基本步骤,综述了确定反向模拟中边界节点脱模准则的方法.

Transverse feeding of molten metal in continuous fiber preform was investigated theoretically and experimentally.

研究了金属液在连续纤维预制型中的横向补缩.

But they also reported that not all green roofs preform perform equally well.

但是他们也报告了不是所有的绿色屋顶都做得同样的好.

AZ 91 magnesium preform with complete shape prepared using spray forming technology under protective atmosphere.

在保护气氛中采用喷射成形制备技术制备了形状完整的AZ91镁合金沉积圆柱坯.

Three-dimensional ( 3D) woven fabric is a type of advanced textile preform and reinforcement of polymer composite with 3D fiber architecture is an effective method to overcome the delamination problem encountered in composites reinforced with a two-dimensional ( 2D) fiber structure.

三维机织物是一种先进纺织结构的纤维预制件，使用三维结构的纤维预制件作为聚合物基复合材料的增强体，是传统的两维结构纤维增强聚合物基复合材料易分层问题的有效解决途径。