共查询到18条相似文献,搜索用时 140 毫秒
1.
<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 相似文献
2.
<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 相似文献
3.
4.
5.
6.
7.
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。 相似文献
8.
卡环弯曲工艺及模具设计 总被引:1,自引:1,他引:0
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。 相似文献
9.
10.
11.
12.
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。 相似文献
13.
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。 相似文献
14.
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。 相似文献
15.
16.
F. Quadrini A. Guglielmotti E.A. Squeo V. Tagliaferri 《Journal of Materials Processing Technology》2010,210(11):1517-1522
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. 相似文献
17.
K. Yilamu R. Hino H. Hamasaki F. Yoshida 《Journal of Materials Processing Technology》2010,210(2):272-278
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 Alin/SSout (i.e., aluminum layer is located inside the bent clad) and SSin/Alout (i.e., stainless-steel layer is located inside the bent clad). From these results, it was found that the sheet-set condition (either Alin/SSout or SSin/Alout) 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. 相似文献
18.
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. 相似文献