At present the method of dealing with it directly is hard to design and the relevant computation is enormous , there are some mature algorithms to solve rectangles layout problem 目前，直接处理异形件布局问题的算法设计难度和计算量较大，而矩形件布局已有一些成熟算法。
The author put forward a method of ann to calculate limiting drawing rate of cup part this time , it is a new thought for determining the cup ' s limiting drawing rate 本次作者提出了采用人工神经网络的方法预测筒形件极限拉深系数，为确定筒形件极限拉深系数给出了一个新思路。
A mechanical model of conical part stamping process is built under the conditions of considering thickness variation , anisotropy , work - hardening , friction factor and so on 摘要在综合考虑板厚变化、各向异性、加工硬化及摩擦等因素的情况下，建立了圆锥形件冲压成形过程的力学模型。
Trough choosing different professing parameters including the ratio of thinning and the ratio of feeding and using two rollers power spinning machine experiment research on cylinders with inner ribs has been started 摘要通过选取不同的壁厚减薄率和旋轮进给比作为工艺参数，利用双旋轮强力旋压机对带内筋筒形件作旋压加工实验。
The present friction model is used for simulating isothermal forming process of the disk of superalloy gh4169 subsequently . the metal flowing rule during forming process of the disk and the distributed rules of the effective strain inside of forging are revealed 在此基础上,对gh4169合金盘形件的成形过程进行了数值模拟,揭示了等温成型过程中金属的流动规律及锻件内部等效应变的分布规律。
Our commpany mainly produces various high quality gb , ansi , jis , din standard fasteners and non - standard . our products are exported to europe and the southeast asia and are widely used in different indudtries , e . g . household electric appliances , instruments and meters , electric tools , automobile , building and decoration , etc 公司主要生产国际（ gb ） ，美标（ ansi ） ，日标（ jis ） ，德标( din )等各类高品质标准紧固件，以及非标准类特殊紧固件、冲压件及异形件产品，并远销欧洲及东南亚地区，产品广泛用于家用电器、仪器仪表、电动工具、汽车制造、建筑装潢等行业。
A three - layer bp network structure is built up on the base of detailed analysis of influence factors of cup ' s limiting drawing rate in the article . use this ann model , better forecasting effect has been got , and the network has a higher precision , is satisfied with engineering design requirement 本文在对筒形件极限拉深系数影响因素的详尽分析基础上建立了一个三层的bp神经网络，运用该网络模型得到了较好的预测效果，具有较高的精度，足以满足工程设计计算要求。
In the paper , the finite element simulation software dynafrom is applied to analyze the affect of different blank holder during the forming process of laminose stepped tubular part , predict the possible defects such as wrinkle and break , obtain the rational style of blank holder avoiding the occur of defects and determine the rational configuration of die . the forming affect of thin - wall shallow stepped tubular part is analyzed when using different lubricate condition ( friction coefficient ) . by this method , the relationship between friction coefficient and drawing depth of laminose stepped tubular part is obtained 本文利用有限元模拟软件dynafrom分析了不同类型的压边圈对薄壁阶梯筒形件成形过程的影响规律，预测了采用不同类型压边圈时可能出现的成形缺陷如起皱和拉裂，获得了防止缺陷产生的合理压边圈形式，确定了合理的模具结构形式；分析了不同的润滑条件（摩擦系数）对薄板阶梯筒形件成形的影响，获得摩擦系数与薄板阶梯筒形件的拉深深度的关系；分析了阶梯筒形件成形过程中的不同阶段的应力应变分布、毛坯材料厚度变化情况，并获得了阶梯阶梯筒形件能一次拉深成形的条件。
Cylindrical cup is a typical axial symmetrical part , though the deformation of material is simple in drawing process , but during the drawing process , exists a lot of influence factors ( including workpiece material character itself as well as each technological parameters ) , and they restrict mutually between the factors . so how to calculate the limiting drawing rate of a cup becomes a complicated nonlinear and multi - gene question . to predicting limiting drawing rate of the cylindrical cup accurately indeed is a very complex subject 筒形件是典型的轴对称拉深件，在拉深过程中材料的变形虽然相对简单，但是在生产过程中，由于影响因素很多（包括工件材料本身性能以及各个工艺参数） ，且各种因素之间相互制约，故如何准确地计算筒形件拉深极限就成为一个复杂的非线性多因子问题，要真正准确预测筒形件极限拉深系数也是一个非常复杂的课题。
The distribution of stress and strain and the variety of blank thickness is analyzed during different forming stages of laminose stepped tubular part . the condition of one - off drawing of laminose stepped tubular part is obtained . plasticity theory and numerical simulation technology of finite element are applied synthetically to analyze the forming technological characteristic of stepped tubular part , 通过综合应用塑性力学理论、有限元数值模拟等手段成功地分析了阶梯筒形件成形工艺特点，获得了阶梯筒形拉深的合理工艺方案及阶梯筒形件一次拉深成形的规律，最后通过实验检验对此工艺方案及规律进行了验证，结果表明本文所提出的工艺方案及阶梯筒形件一次拉深成形规律是正确可靠的，能直接用于指导生产。
