摆动块弯形模的设计和计算

<正> 对于双向90°弯曲零件的弯形,有时用两套模具弯成,其工艺过程如图1所示。由于其生产率较低,工装总费用高,也常设计一些新结构的弯形模一次弯成,如带弹性凸模的双凸模弯形模、翻板模和转销模等等。 这些模具结构复杂,冲压零件上会产生划痕,零件回弹不易消除。现设计了一套摆动块式弯形模,能将图2所示零件全部一次弯成。成形零件的高度尺寸精度高,弯曲半径     

摆块式U形弯曲模的设计

<正> 一、概 述 对于加工如图1所示的U形冲压件,通常是在两套结构相似的U形弯曲模上分二次弯曲而成;这一加工方法生产效率较低,工件也难获得较高的精度。如用一次U形弯曲模进行加工,由于坯料在弯曲过程中受模具圆角摩擦阻力的影响,工件的展开尺寸误差较大且表面擦伤严重。笔者引用精弯模原理设计了摆块式U形弯曲模,试用后效果很好,该模具不仅实现了凸缘部分大,直边部分深的U形件一次弯曲成形,而且能使工件获得稳定的尺寸精度和良好的表面质量。 摆块式U形弯曲模的工作原理如图2。坯料放在下摆块9的工作面上,由限位块11     

弹性钢卡级进模设计

在详细分析弹性钢卡零件工艺特点的基础上 ,确定了零件的排样方案 ,设计了1副使用活动成形块进行弯曲的多工位级进模 ,保证了零件的精度 ,提高了生产效率。     

汽车线束总成用端子模设计

通过活动摆块对端子进行弯曲成形,巧妙的旋转摆动,使得带钩状的弯曲得以实现,结构简单、独特。     

封闭零件弯曲模设计

分析了封闭弯曲件的结构特点，介绍了封闭弯曲件一次成形模的几种结构，设计出摆动卸料装置，有效地解决了封闭零件长距离自动卸料的问题。     

大型接插类零件多工位级进冲压的柔性模块化模具结构

一种能实现多种零件共线生产的大型接插类零件多工位级进冲压的柔性模块化模具结构。它是将多工位级进模具按冲压工艺分成多个模块单元,这些模块单元可分别完成大型接插类零件的冲压、弯曲、成形、条料定位等功能。每台压力机配有1个通用的大模架,用多个步距定位块将多个模块单元定位在大模架上。     

打印机弹片级进模设计

介绍了弹片零件的成形工艺、排样设计和模具结构设计,模具主要工作零件为镶拼结构,重点介绍了模具弯曲部分的结构,采用浮顶块将零件抬起,通过斜楔滑块机构完成零件的弯曲,解决了零件45°角成形困难的问题。     

卡环弯曲工艺及模具设计

通过对卡环弯曲成形的工艺分析,阐述了圆管形件弯曲成形工艺及其模具设计的特点;分析了凹模摆块机构的几何运动,设计了相应的弯曲模结构,可为类似零件的成形提供参考。     

线束卡箍级进模设计

分析了线束卡箍的冲压工艺,阐述了零件通过滑块和弹顶块实现弯曲的过程,介绍了成形零件的排样设计、模具关键零件的设计要点及模具结构特点等。模具经实际生产验证,安全可靠,对类似零件的成形有一定的参考作用。     

摆动块内抽芯注射模设计

介绍了摆动块内抽芯机构,并设计了摆动块内抽芯注射模.着重阐述了摆动块内抽芯的设计原理、注意事项及安装方式.     

摆块式弯曲模结构设计

介绍了两种摆块式弯曲模具结构，并推广了其应用的范围，有益于模具技术的发展，有利于生产力的提高。     

翻转模块式精密弯曲模

介绍了翻转模块式精密弯曲模的实用结构及模具工作过程和结构特点。该弯曲模凹模由翻转模块与垂直浮动的托件板铰接而成 ,使毛坯变形时始终与凹模紧密贴合 ,不滑动 ,毛坯已有的凸部与凹模不干涉 ,因此模具工作可靠 ,弯制的零件精度高。     

空调器电器盒弯曲模设计

介绍了盒形件弯曲模具的设计思路、模具结构 ,着重介绍了弯周边模具主要工作零件设计 ,其中活动凸模横向移动装置是一种较好的弯曲件脱模机构。     

空调器电路盒弯曲模设计

介绍了盒件弯曲模具的设计思路，模具结构，着重介绍了弯周边模具主要工作零件设计，其中活动凸模模向移动装置是一种较好的弯曲件脱模机构。     

上模双耳伸缩、下模滚轴式侧移的折弯模设计

对带U形沟槽工件的折弯工艺进行分析,设计了一种上模双耳伸缩、下模滚轴式侧移的折弯模。上模采用双耳结构,在折弯过程中通过伸缩绕开工件的U形沟槽完成折弯过程,解决了带U形沟槽工件的折弯难题。下模采用侧移的方式,只对工件较短折边折弯,减少了操作难度;下模模头处设计滚轴,使折弯由滑动摩擦变为滚动摩擦,改善了工件的表面质量。应用ABAQUS软件模拟了板料的弯曲回弹过程,并对该模具的关键参数及技术要求进行了分析。     

Laser forming of open-cell aluminium foams

Open-cell aluminium foams cannot be formed by conventional mechanical processes because of the occurrence of failure during deformation. In this study, open cell-aluminium foams with different densities were laser bent by means of a diode laser. Laser bending tests were performed with different values of laser power and scan velocity, and were compared with mechanical bending tests. High bending angles were reached for proper combinations of process parameters: 90° bending was obtained by sharing out the total angle among many parallel bending lines. The process efficiency was measured in terms of bending increase per single laser pass: similar efficiencies were observed for the foams with different density at low number of scans, but higher efficiencies were measured for the low density foam at high number of scans because of the lower pre-heating during the process.     

Air bending and springback of stainless steel clad aluminum sheet

This paper deals with bending and springback phenomena of a stainless-steel clad aluminum sheet in V-shaped air bending. The aim of this study is to investigate the bending characteristics such as sheet thickness change and the bending angles of the sheet before/after springback. The first part of this paper is on the experimental observations. V-bending experiments were performed for both the cases of Al_in/SS_out (i.e., aluminum layer is located inside the bent clad) and SS_in/Al_out (i.e., stainless-steel layer is located inside the bent clad). From these results, it was found that the sheet-set condition (either Al_in/SS_out or SS_in/Al_out) has a great influence on the bending phenomena. In the second part, the accurate prediction of springback by FE analysis, especially the role of elasto-plasticity models, is discussed. When using Yoshida–Uemori kinematic hardening model (F. Yoshida, T. Uemori, Int. J. Plasticity 18, 2002; Int. J. Mech. Sci., 45, 2003), which well describes the Bauschinger effect of materials, the springback of the clad sheet is accurately calculated, whereas the classical isotropic hardening model underestimates the springback.     

Numerical analysis of dimension precision of U-shaped aluminium profile rotary stretch bending

In order to enhance the dimension precision of bent part, advanced bending technologies is requested recently. Rotary stretch bending（RSB） is a suitable technology to realize high precision of bent part. The effect of processing parameters, namely the side pressure and the stretching force, on the dimension precision of aluminium profile RSB part was studied by finite element method. The numerical simulation of the U-shaped aluminium profile RSB was carried out, and the validity of the simulation was checked. Parametric analysis shows that the section distortion of the U-shaped profile LY 12M bent part decreases with the increasing of the side pressure, whereas the springback of curvature increases, and that both of the section distortion and the springback of curvature decrease with the increasing of the stretching force, moreover, the uniformity of curvature of the bent part is clearly enhanced with the increasing of the stretching force. The results above prove that RSB technology can better improve the dimension precision of aluminium profile bent part.