Solid Edge在圆锥台钣金件展开设计中的应用

对圆锥台钣金件的传统展开方法与应用Solid Edge钣金模块进行展开的方法做了分析比较.并通过一个实例介绍了Solid Edge钣金模块展开圆锥台钣金件的具体过程和注意事项,阐明了该种方法可以精确、快速、直观地展开各种不同的圆锥台钣金件,大大提高了饭金件设计的精确率及效率.     

钣金折弯件快速展开工艺分析

钣金件快速正确的展开直接决定着钣金加工的效率、加工精度和加工成本。本文通过对钣金件尺寸链的分析,推导出了零件展开尺寸长度与折弯补偿系数之间的关系。通过对不同材料的折弯加工的试验分析,得出适合钣金加工的折弯补偿系数表,并利用折弯补偿系数表中的、数值应用于适合折弯件的快速展开过程中,从而实现钣金折弯件的精密、快速展开加工。     

Pro/E钣金展开软件在生产中的应用

在使用Pro/E钣金设计软件进行钣金设计与展开的过程中,按照选取Y值和计算公式来计算展开长度,对同一钣金件只能用同一个Y值来计算。但在实际钣金成形中,由于使用不同类型的成形设备,而不同设备成形折弯处的拉深量不尽相同,使得钣金成形后的实际拉深量与Pro/E计算拉深量数值不一致,造成钣金件成形后累积误差大。针对以上情况,对Pro/E展开长度计算公式进行了重新设计,使软件系统可以对同一部件按成形情况分别计算展开长度。     

基于SolidWorks的折弯系数表的二次开发及应用

目前钣金制造企业中钣金件展开图绘制的方法为人工绘制,效率较低,且易出错误。通过分析90°角钣金件展开长度的计算方法,对SolidWorks软件自带的折弯表进行二次开发,使90°角钣金件模型通过加载二次开发折弯表可以实现1∶1准确展开。90°角钣金件展开后工程图可以保存为DXF文件,直接输入到数控塔冲、数控激光切割机中进行编程加工。     

冰箱钣金件展开尺寸计算浅析

钣金件由于具备结构紧凑、外形美观可靠、加工周期短和成型成本低等优点,被广泛应用在冰箱箱壳、门板、压缩机托板以及门铰链设计中。折弯作为钣金件最主要的成形工序,其展开板料长度将对钣金折弯件尺寸精度产生影响。针对展开料长度精度计算问题展开研究,提出具体计算方法,旨在提高钣金折弯件加工尺寸精度。     

钣金非90°折弯展开料长度的计算方法

正钣金件由于具有结构紧凑、外形美观、牢固可靠、周期短、成本低,以及便于使用模具加工等特点,在电子产品的机箱、机柜及操作台等领域中,得到了极为广泛的应用。折弯是钣金件最典型和最主要的成形工序。展开料长度是否准确直接关系到钣金折弯件的尺寸精度。准确计算展开料长度是钣金设计的首要任务     

基于Solid Works钣金件展开尺寸的精确计算方法

针对用Solid Works计算的钣金件展开尺寸折出的钣金件因没有考虑材料特性,达不到零件尺寸要求的问题,介绍了利用钣金件展开尺寸的修正系数,基于Solid works的钣金件展开尺寸的一种精确计算方法,实践证明能满足零件尺寸要求。     

Pro/E软件实现90°角钣金件1∶1展开的二次开发及应用

目前在钣金企业中,钣金件展开图绘制的效率较低,且易出错误。本文通过分析90°角钣金件展开长度的计算方法,对Pro/E软件自带的折弯表进行二次开发。对于前期90°角钣金件的Pro/E模型,通过加载二次开发折弯表,可以实现1∶1准确展开;对于新建90°角钣金件的Pro/E模型,可通过对钣金件公制、英制模板文件设置后,直接按照1∶1准确展开,展开后工程图可以保存为DXF文件,可以直接输入到数控塔冲和数控激光切割机中进行编程加工。二次开发折弯表仅适用于90°角钣金件。     

弯曲件坯料展开尺寸的计算

介绍弯曲件坯料展开尺寸计算的2种方法：公式近似计算法和Pro／E钣金展开计算法,进行了比较分析,阐明Pro／E钣金展开方法在钣金件展开尺寸计算中的优越性,实用性。     

基于SolidWorks的复杂相贯圆锥体钣金下料方法

本文针对传统钣金下料在实际工程应用中的缺点,以复杂相贯圆锥体为例,提出了一种基于SolldWorks钣金下料新方法,利用计算机三维设计分析软件SolidWorks的钣金下料功能,对钣金件进行实体造型,再进行抽壳,切割,转化为钣金件,展开,快速生成下料图,突破了传统作图法、计算法的束缚.其过程具有省时、计算量小、精确度高等优点,大大地提高了钣金下料的效率.     

An Automated Progressive Process Planning and Die Design and Working System for Blanking or Piercing and Bending of a Sheet Metal Product

This paper describes the development of a computer-aided design and manufacturing system for irregular-shaped sheet metal products for blanking or piercing and bending operations. The approach is based on knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. This program for the system has been written in AutoLISP using AutoCAD and on SmartCAM using a personal computer and is composed of nine modules, which are input as shape treatment, flat pattern-layout, production feasibility check, blank-layout, strip-layout, die-layout, data-conversion, modelling, and post-processor modules. Based on knowledge-based rules, the system is designed by considering several factors, such as material and thickness of product, complexities of blank geometry and punch profile, diameter and material of a wire, and the availability of a press. This system is capable of unfolding formed sheet metal to give a flat pattern and automatically accounts for the adjustment of bending allowances to match tooling requirements by checking dimen-sions and generating NC data automatically according to the drawings of the die-layout module. Results obtained using the modules enable the designer and manufacturer of blanking or piercing and bending dies to be more efficient in this field.     

低压电器柜钣金件三维参数化设计系统的开发

介绍了以VB作为开发工具，在SolidEdge三维软件平台上进行低压电器柜钣金件参数化建模的二次开发方法。结合数据库Access技术，具体阐述了低压电器柜钣金件三维建模基本原理，介绍了参数化设计系统的开发实例，指出了该系统的实用性和适用性。     

A study on the effect of rectangular cut out on laser forming of AISI 304 plates

Laser bending of a rectangular AISI 304 plate with a rectangular cut out is investigated in the present work. In particular, effects of process parameters: laser power, scanning speed, and geometric parameters: dimensions of the cut out of sheet metal on temperature distribution and bending angle are explored with the help of numerical simulation. Analyses are carried out through a coupled thermo-mechanical formulation with finite element method using COMSOL MULTIPHYSICS. The temperature distribution and deformation of sheet metal have been obtained from numerical simulations. The bending angle is affected by process parameters, namely, laser power, scanning speed, and width of the cut out of the sheet metal. Position of the cut out vis-à-vis the scanning path and length of the cut out have very little effect on the bending angle.     

基于IGES的钣金零件特征识别的方法研究

针对钣金设计软件数据模型的外部读取与特征识别问题,对钣金设计软件的数据共享、IGES文件结构以及零件特征分类进行了研究,提出了一种基于IGES曲面模型的后置处理方法,通过遍历IGES文件,获取了钣金零件的所有裁剪参数曲面信息,建立了以折弯面作为结点的双向链表的数据结构,根据IGES文件的数据特征,对钣金零件进行了特征分类,提取了钣金折弯特征并建立了特征间的依赖关系。利用Pro/E软件绘制的钣金零件对特征识别方法进行了测试。研究结果表明,该方法能够准确地获取钣金的特征,为钣金零件折弯仿真与工序规划提供了可靠的特征数据,使得产品开发周期缩短了近30%,最终实现了钣金加工的精确性与高效性。     

Analytical modeling and numerical simulation for three-roll bending forming of sheet metal

The three-roll bending forming of sheet metal is an important and flexible manufacturing process due to simple configuration. It is suitable for forming large sheet parts with complex, curved faces. Most researches on roll bending forming of large workpiece are mainly based on experiments and explain the process through macroscopic metal deformation. An analytical model and ABAQUS finite element model (FEM) are proposed in this paper for investigating the three-roll bending forming process. A reasonably accurate relationship between the downward inner roller displacement and the desired springback radius (unloaded curvature radius) of the bent plate is yielded by both analytical and finite element approaches, which all agree well with experiments. Then, the three-roll bending forming process of a semi-circle-shaped workpiece with 3,105 mm (length)?×?714 mm (width)?×?545 mm (height) is simulated with FEM established by the optimum tool and process parameters. Manifested by the experiment for three-roll bending forming of this workpiece, the numerical simulation method proposed yields satisfactory performance in tool and process parameters optimization and workpiece forming. It can be taken as a valuable mathematical tool used for three-roll bending forming of large area sheet metal.     

基于Solid Edge平台的渐开线斜齿轮三维特征造型

介绍了两种基于Solid Edge环境下的渐开线斜齿圆柱齿轮三维特征造型行之有效的方法:变化剖面扫描法和路径扫描混成法.并利用Microsoft Excel电子表格创建齿轮渐开线,用变量表输入齿轮的基本参数、计算公式等,从而实现了斜齿轮的参数化造型.     

Solid Edge与基于Web的PDM系统的集成

简述了Solid Edge与基于Web的PDM系统集成的意义,并提出了运用ASP．net、VB等技术实现通过基于Web的PDM系统调用Solid Edge、对Solid Edge模型进行尺寸驱动、网络浏览和数据管理的具体方法。     

金属薄板开槽弯曲成形技术与设备

V形弯曲成形前，对金属薄板折弯处进行一定深度的V形开槽，然后在V形开槽处进行弯制成形，此种加工方法称之为V形开槽弯曲成形技术。用V形开槽弯曲成形技术弯制的工件弯曲圆角半径小，色泽变化不明显，弯制成形力小，且减少了窄长工件弯曲棱边直线度误差。并在普通折弯机上用通用模具就能弯制断面形状复杂的工件。V形开槽弯曲成形技术的关键设备是薄板开槽机，有多种结构形式和控制方式供选择。     

An exact solution for the elastic/plastic bending of anisotropic sheet metal under conditions of plane strain

A theoretical analysis for the elastic/plastic bending of sheet metal exhibiting a state of normal anisotropy is considered in this paper, assuming a plane strain condition to exist in the deformation process. The material is supposed to yield according to Hill's quadratic yield criterion and its associated normality rule of plastic flow. The relationship between the bending couple and the curvature of the bent sheet is presented in a graphical form that reveals the influence of anisotropy and strain-hardening on the bending characteristic of the sheet metal. The results indicate that the elementary bending theory significantly overestimates the magnitude of the bending couple to produce a given elastic/plastic curvature of the bent sheet.