期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
Research on the Casting-forging Precision Forming Process of Alternator Poles 被引量:6
1
作者 CHEN Hui-qin, WANG Quan-cong, GUO Hui-guang (Material Science and Engineering Department, Taiyuan Heavy Machinery Institute, Taiyuan 030024, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期4-5,共2页
The casting-forging combined technique and the closed die forging without flash-less are both new developed material working methods. The former can not only decrease forming operations of forgings, but also increase ... The casting-forging combined technique and the closed die forging without flash-less are both new developed material working methods. The former can not only decrease forming operations of forgings, but also increase the material utilization ratio. Therefore, it is applied to produce more complex forgings. The latter is required for forging precise parts without burrs. The alternator pole is a complex forging, which was usually produced by hot forging, upsetting-extrusion or upsetting-extrusion and bending processes. During these processes, not only the forming force is higher, but the material of burrs accounts for 30 percent or so of total required material. And burrs are difficult to remove in the sequential machining process. In accordance with defects exiting in current manufacturing of alternator poles by upsetting-extruding process, such as more material demand, higher forming force and difficulty of next machining, a casting-forging precision process of alternator poles was developed and investigated in this paper. In the process, the pole was formed by two operations. One is the pre-forming operation by casting. The other is the final forming operation by the closed precision forging process. This can not only shorten processes, decrease material and power demand, but also increase precision of forgings. First, the casting blocker was designed considering the casting process and the forging ratio and the mode of deformation. Then the die structure for closed precision forging was designed, and the closing device for forging dies with spring assemblies in order to provide the necessary closing force was also designed. Finally the forming processes was investigated by test and numerical simulation method to optimum process parameters and die structure design parameters. The result can provide basis for applying the process to manufacture poles in practice. 展开更多
关键词 alternator pole casting-forging precision forming process
下载PDF
Effect of Deformation Condition on Axial Compressive Precision Forming Process of Tube with Curling Die
2
作者 He YANG and Zhichao SUN College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第1期135-136,共2页
The effect of the deformation condition on the axial compressive precision forming process of tube with curling die was investigated by using a rigid-plastic FEM. The results show that the forming accuracy depends mai... The effect of the deformation condition on the axial compressive precision forming process of tube with curling die was investigated by using a rigid-plastic FEM. The results show that the forming accuracy depends mainly on geometric condition rp/d0, little on tube material properties and friction condition; the relative gap △/2rp of double-walled tubes obtained decreases with Increasing rp/d0, and there is a parameter k for a given to/do or rp/t0, when rp/d0 >k, △/2rp< 1, otherwise △/2rp>1. 展开更多
关键词 Effect of Deformation Condition on Axial Compressive precision forming Process of Tube with Curling Die
下载PDF
Forming-Precision-Driven Structure Design of Hydraulic Press: Methodology and Case Study
3
作者 李艳聪 张连洪 +2 位作者 何柏岩 陈永亮 张淳 《Transactions of Tianjin University》 EI CAS 2015年第6期541-553,共13页
The structure stiffness of presses has great effects on the forming precision of workpieces, especially in near-net or net shape forming. Conventionally the stiffness specification of presses is empirically determined... The structure stiffness of presses has great effects on the forming precision of workpieces, especially in near-net or net shape forming. Conventionally the stiffness specification of presses is empirically determined, resulting in poor designs with insufficient or over sufficient stiffness of press structures. In this paper, an approach for the structure design of hydraulic presses is proposed, which is forming-precision-driven and can make presses costeffective by lightweight optimization. The approach consists of five steps:(1)the determination of the press stiffness specification in terms of the forming precision requirement of workpieces;(2)the conceptual design of the press structures according to the stiffness and workspace specifications, and the structure configuration of the press;(3)the prototype design of the press structures by equivalently converting the conceptual design to prototypes;(4)the selection of key structure parameters by sensitivity analysis of the prototype design; and(5)the optimization of the prototype design. The approach is demonstrated and validated through a case study of the structure design of a 100 MN hydraulic press. 展开更多
关键词 hydraulic press structure design precision forming conceptual design prototype design optimal design
下载PDF
The Properties of an UV Curable Support Material Pre-polymer for Three Dimensional Printing
4
作者 黄兵 莫健华 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第2期278-281,共4页
An ultraviolet(UV) curable support material pre-polymer for three dimensional printing was prepared based on the synergistic effect between PEO-PPO-PEO tri-block copolymer(F127) and polyethylene glycol (400) di-... An ultraviolet(UV) curable support material pre-polymer for three dimensional printing was prepared based on the synergistic effect between PEO-PPO-PEO tri-block copolymer(F127) and polyethylene glycol (400) di-acrylate(SR344). The effects of jetting conditions, thermal stability, curing time, mechanical properties and shrinking rate on printing models were studied. The situation of removing support material from build model was investigated after building progress was completed. The experimental result shows that when F127 is 6.0wt%, SR344 is 20.0wt%, 4-Methoxy phenol is 0.15wt% and Irgacure 2959 is 1.5wt%, the support material pre-polymer could be jetted out from the nozzles smoothly during building up of three dimensional printing models at 50-55 ℃. In addition, the support material could be removed easily from building model without spoiling the model; furthermore, the forming precision of building model is improved. 展开更多
关键词 three dimensional printing support material synergistic effect forming precision
下载PDF
Laboratory of Precision Plastic Forming In NWPU
5
《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2012年第2期F0003-F0003,共1页
Aiming at the international frontiers of plastic forming fields, under the supports of over 50 important projects such as NSFC, 973, 863 and other National Key Projects, the laboratory focuses on four research topics,... Aiming at the international frontiers of plastic forming fields, under the supports of over 50 important projects such as NSFC, 973, 863 and other National Key Projects, the laboratory focuses on four research topics, viz., local-loading based unequal deformation controlling and integrated precision forming for shape and performance, digitalized precision plastic forming controlling based on through-process, multi-scale modeling & sinmlation and optimization, force-save near-net-shape plastic forming technology for large-scale, 展开更多
关键词 Laboratory of precision Plastic forming In NWPU NSFC
原文传递
Recent developments in plastic forming technology of titanium alloys 被引量:33
6
作者 YANG He FAN XiaoGuang +2 位作者 SUN ZhiChao GUO LiangGang ZHAN Mei 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期490-501,共12页
Titanium alloys have been used extensively in industry fields including aviation,aerospace and automobile due to their excellent comprehensive properties.Research and development of advanced plastic forming technology... Titanium alloys have been used extensively in industry fields including aviation,aerospace and automobile due to their excellent comprehensive properties.Research and development of advanced plastic forming technology are of great importance to manufacturing titanium products of high performance and lightweight with low cost and short cycle.This paper analyzes the development tendencies of titanium alloy forming technology.Recent achievements in precision forming,microstructure control and multi-scale simulation of titanium alloys are reviewed.The forming techniques of large-sale integral complex components are presented. 展开更多
关键词 titanium alloys precision forming microstructure control multi-scale simulation large-scale integral complex components
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部