单面焊双面成形在船舶克令吊基座上的应用

将单面焊双面成形新工艺应用于船舶克令吊上,介绍设计原理和操作方法,装配要求对焊接质量的影响,对新旧工艺进行相关对比。     

斯太尔汽车车架横梁的热压成形

斯太尔汽车车架横梁是陕汽厂引进的奥地利斯太尔重型汽车生产技术中一个重要零件。其形状复杂，变形程度大，采用热压成形。本文介绍了车架横梁的生产工艺、热压模设计，调试及生产中应注意的问题。     

Comparison of GTN damage models for sheet metal forming

The Gurson-Tvergaard-Needleman(GTN) damage model was developed basing on anisotropic yield criterion to predict the damage evolution for anisotropic voided ductile materials.Hill's quadratic anisotropic yield criterion(1948) and Barlat's 3-component anisotropic yield criterion(1989) were used to describe the anisotropy of the matrix.User defined subroutines were developed using the above models.Taking the benchmark of NUMISHEET'93 square cup deep drawing as an example, the effect of matrix plastic anisotropy on a ductile material was studied.The predicted result by Barlat'89-GTN model has a better agreement with the experimental data than that by Hill'48-GTN and the original GTN model.     

Engineering design optimization based on intelligent response surface methodology

An intelligent response surface methodology （IRSM） was proposed to achieve the most competitive metal forming products, in which artificial intelligence technologies are introduced into the optimization process. It is used as simple and inexpensive replacement for computationally expensive simulation model. In IRSM, the optimal design space can be reduced greatly without any prior information about function distribution. Also, by identifying the approximation error region, new design points can be supplemented correspondingly to improve the response surface model effectively. The procedure is iterated until the accuracy reaches the desired threshold value. Thus, the global optimization can be performed based on this substitute model. Finally, we present an optimization design example about roll forming of a ＂U＂ channel product.     

基于高频感应加热的船用钢板材弯曲成形

在船舶建造过程中,高频感应加热是实现船体板材高效高精度弯曲成形的重要方法。首先采用25 kW新型高频感应加热设备,进行不同感应加热过程及工艺的试验,得到典型弯曲形式的船体外板(马鞍型和帆型)。同时,采用三坐标定位仪进行面外弯曲变形的测量和曲面重构,得到试验板材面外弯曲变形的分布和数值。通过热-弹-塑性有限元分析与弹性有限元分析两种方法,计算预测板材在高频感应加热作用下的面外弯曲变形,两种数值方法预测的板材面外弯曲变形趋势和数值与测量结果比较吻合,且在弹性有限元分析中,计算机资源消耗少,计算结果精度高。     

2012中国国际金属成形展将展示百余台套实物生产线

2012中国国际金属成形展览会即将于2012年9月10-13日在中国国际展览中心W1-W2馆举办。展商和观众组织工作情况为历年同期最好的一届,共有近300家冲压、钣金和锻造设备、模具、零部件和材料企业     

汽车零件温冷复合成形加工技术及产业化应用现状

分析了传统热成形工艺与冷成形工艺的不足,介绍了温冷复合成形的工艺特点、毛坯的精度和机械性能,以及我国温冷复合成形技术的现状及发展趋势,并列举了温冷复合成形技术在汽车行业的若干产业化推广案例。     

广东自贸区 初步方案成形

近日，商务部驻深圳特派员办事处网站披露，广东自由贸易区的初步方案已成形，范围拟包括广州的南沙、深圳的前海、珠海的横琴及广州白云空港。这意味着，此前广泛流传的南沙、前海、横琴三个新区，将“打包”申请自贸区的消息得到官方证实，且自贸区还新增了白云空港。消息同时称，广东自贸区近期将迎来商务部调研组的可行性评估，评估通过后将报送国务院审批。逾1300平方公里的广东自贸区，规模远超上海自贸区，面积达上海自贸区（28．78平方公里）的40多倍。     

路面水稳层分次摊铺一次成形施工技术与质量控制

介绍路面水稳层施工时采用分次摊铺一次成形施工技术的优点及施工的质量控制。     

基于热成形的变截面B柱优化设计

文章基于轻量化的需求,以基础热冲压成形B柱为对象,采用变截面热成形技术,进行不同截面厚度设计,并进行零件级别仿真分析,得到优化方案,最后进行整车验证分析,满足使用性能,并且实现轻量化。