薄壁

In order to acquire the heating-cooling process of laser molten pool and the mutual effect of sintering layers in multi-layer powder sintering, factors such as heat conduction, heat radiation, heat convecting and changeable thermophysical property parameters were taken into account comprehensively, the 3D transient state FEM of the temperature field of multi-layer thin-wall metal parts formed by DMLS was established based on ANSYS. The APDL (ANSYS Parametric Design Language) was used to carry out thermal resource moving and the technique of birth/death for element was used to simulate the process of material addition.

为掌握多层粉末烧结过程中激光熔池的加热冷却规律以及各烧结层之间的相互影响，综合考虑热传导、热辐射和热对流以及材料的高度非线性，基于ANSYS平台建立了多层金属薄壁件的三维温度场有限元模型，利用APDIJ语言编程实现模拟中激光热源的移动，采用&单元生死&技术描述粉末材料动态增长过程。

In the process of the solid parts of hollow pier construction, hole is reserved in the pier wall, solid steel corbels is installed in the hole as vertical support piers for the top construction of cast in place solid pier .

结合桥梁施工实例，介绍在施工薄壁空心桥墩墩顶实心部位时，采用在墩壁预留孔，孔内安装钢棒牛腿作为现浇实心墩顶的竖向支撑，进行空心墩顶部实心段施工的工艺。

In recent years thin wall packaging has become an increasingly well delineated sub-segment of the rigid plastics market.

近年来，薄壁包装已成为一个日益明确的子市场的硬质塑料市场。

That if the process can produce much liquid phase during the sintering, and which can become into completely-crystal needle-shap or aborization or bar-shap calcium ferrite instead of glass in the cooling process; if the magnetite is interweaved by the caking into the melting corrosion structure, the granular structure or the eutectic structure instead of exiling in the massive isolation; if the mount of the poreis is little, and uniformitly distributing; if the grain is little; if the organizational structure is symmetrical, all of which can improve the quality of the sintering.

另外还归纳出有利于强度提高的工艺参数和操作制度。分析工业试验和水钢现行生产的矿物组成、结构表明，水钢烧结矿以他形晶磁铁矿为主，铁酸钙为主要的粘结相，多形成熔蚀结构、粒状结构和共晶结构，强度较高；而在台车边缘和表层，由于存在较严重边缘效应和点火温度较低，使该区域的烧结矿组织结构疏松，局部呈蜂窝状或薄壁大孔状，铁酸钙较少而硅酸二钙和玻璃质较多，形成骸晶状结构和磁铁矿连晶，强度较低，致使返矿升高。

Type steels are a kind of light economic section shaped steel with the perpendicular among thin-walls, girths and web plates.

型钢是一种轻型薄壁、翼缘与腹板垂直的经济断面型钢。

In recent years, for its 300,000 tons of annual production for cast iron and 450,000 tons for steel billet, it has become the largest production base for common carbon steel billet in Henan. H-type steels are a kind of light economic section shaped steel with the perpendicular among thin-walls, girths and web plates.

公司是河南省最大的普碳钢坯生产基地，具有年产生铁30万吨，钢坯45万吨的生产能力。H型钢是一种轻型薄壁，翼缘与腹板垂直的经济断面型钢。

The cells of the bundle sheath that surround the vascular tissues are large and contain specialized elongated chloroplasts that do not contain grana, but form starch grains.

它的特点为：围绕在维管组织外层的维管束薄壁细胞较大，并含有较大的叶绿体，这些叶绿体中不含基粒，但形成淀粉粒。

This paper analyses the relation between the cutting force and cutting depth in the course of belt grinding,builds the mathematics model of optimum cutting parameter to improve efficiency and intensity,and proposes the processing method for controlling griding precision of rotary thin-wall parts.

通过实验分析了带轮磨削过程中切削力和切削深度之间的关系，从提高切削效率和强度出发，选择优化切削参数，建立了切削参数数学模型；提出了控制回转形薄壁零件磨削精度的加工方

This paper proposes to adopt impregnating technology to deal with the partial leakage of high-pressured thin-wall aluminium alloy castings.

针对承压的大型薄壁铝铸件的局部渗漏现象，采用浸渗方法消除。

28 Span in the main line bridge overpassing Huning Railway in A30 Expressway of Shanghai North Ring, and introduces the anti-crack measures taken in the construction and the results.

该文对上海北环A30高速公路上跨沪宁铁路主线桥第28孔薄壁墩施工中可能出现的问题进行了分析，并介绍了施工中采用的防裂措施和效果。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐