外文翻译原文
Available online at http://wendang.chazidian.com
ScienceDirect
Procedia Engineering 100 ( 2015 )885 – 890
25th DAAAM International Symposium on Intelligent Manufacturing and Automation, DAAAM 2014
Dynamic Behavior of the Hydraulic Press for Free Forging
Karel Raz*, Vaclav Kubec, Milan Cechura
University of West Bohemia, Faculty of Mechanical Engineering, Regional Technological Institute, Univerzitni 8, 306 14 Pilsen, Czech Republic Abstract
Work on hydraulic presses is defined by a static forging force. This force may have in special cases of forging properties of dynamic and shock load. Commonly used hydraulic presses can use speed-forging with speed up to 180 strokes per minute. Our goal is to compare different types of frame designs used for hydraulic forging presses. Result is determination of the suitability of each supporting structures for these special operations. Comparing is made using FEM modal analysis. The performed modal analysis show needs for lowering of first critical natural frequency. An overview of these frequencies is shown in attached tables. © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license © 2015 The Authors. Published by Elsevier Ltd. (http://wendang.chazidian.com/licenses/by-nc-nd/4.0/).Peer-review under responsibility of DAAAM International Vienna. Peer-review under responsibility of DAAAM International Vienna
Keywords: hydraulic press; free forging; modal analysis
1. Main Text
The task of every research group is to solve their research topics at least one step ahead of the current needs of the industry.
This is connected with prediction of development in this area. As part of the University of West Bohemia in Pilsen, we tried in advance to deal with it. In cooperation with industry we tried to find tasks in the field of metal forming machines.
Dynamic behaviour is one of the key problems in the design of hydraulic presses for free forging.
This topic is relevant because customer needs hydraulic press for forging with higher number of strokes per minute. Different designs of hydraulic presses were not compered seriously up to now. We decided to perform monitoring of individual design options, and then make precise modal analysis. This analysis is done on individual
* Corresponding author. Tel.: +42-037-763-8254.
E-mail address: kraz@rti.zcu.cz
1877-7058 © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://wendang.chazidian.com/licenses/by-nc-nd/4.0/).
Peer-review under responsibility of DAAAM International Vienna
doi: 10.1016/j.proeng.2015.01.445
内容需要下载文档才能查看 内容需要下载文档才能查看
886 Karel Raz et al. / Procedia Engineering 100 ( 2015 ) 885 – 890
types of designs of hydraulic forging presses. This virtual simulation will show us basic dynamic behaviour of free forging presses design. Currently is in industry commonly used design of hydraulic forging presses with top drive, two-column or four-column, or with lower drive with two-column or four-column.
For analysis were chosen presses with comparable properties (size, force). Conditions for the analysis and the results of the analysis are in the following article.
2. Hydraulic free forging presses
The actual trend is to use the presses up to their maximum specification (maximal force, maximal count of strokes per minute). Generally are free forging operations (upsetting...) using calm force (no fast changes of force). During monitoring of hydraulic press´s lifetime and technological operations, we realized that for some technological operations this is not true.
One of the operations during which is press dynamically loaded is high-speed forging (up to 180 strokes per minute).
For comparison purposes, we used a hydraulic presses with a different structural design of the frame, but with equivalent technological parameters. Main technological parameters, which are considered are forging force and maximum size of forged piece. Force is 50 MN, the space between columns in a direction perpendicular to the machine axis is four meters.
The proposed structural variants are comparable in terms of maximal stress in structure. Maximal difference in stress between same parts in all presses is less than 10%. The Von-Misses stress in all designs of presses are in the range of 50 to 75 MPa depending on the actual load condition (upsetting, lengthening,..).
For comparison were chosen four typical hydraulic press designs. [1, 2, 3]
Hydraulic press 1 (Fig.1 a) Press with four-column frame and top drive. It has pre-stressed rectangular columns and beams are designed as castings from one piece.
Hydraulic press 2 (Fig.1 b) Press with two-column frame and top drive. It has pre-stressed rectangular columns and beams are designed as castings from one piece.
Hydraulic press 3 (Fig.2 a) Press with two-column frame and bottom drive. It has pre-stressed rectangular columns (both with two anchors) and beams are designed as castings from one piece.
Hydraulic press 4 (Fig.2 b) Press with two-column frame and top drive. It has pre-stressed rectangular columns (both with eight anchors) and beams are designed as castings from one piece. Columns have open profile from one side.
Fig. 1. a,b Hydraulic press 1 and 2.
内容需要下载文档才能查看 内容需要下载文档才能查看
Karel Raz et al. / Procedia Engineering 100 ( 2015 ) 885 – 890 887
Fig. 2. a,b Hydraulic press 3 and 4.
3. Modal analysis
For theses designs of hydraulic presses, we prepared a virtual models, which includes all the important parts of the frame (columns, anchor nuts, working cylinders, plungers). Movable members (movable crossbeam) are in a defined position, which is based on the common dimension of forged piece at these large hydraulic presses.
To include all influences was into FEM model added 0D element (point) [7, 8] with mass property equal to mass of working liquid. The simulation includes definitions of contacts in areas of relative motion of the parts. Among lower and upper anvil is defined boundary condition which allows their movement in horizontal direction. Other directions of deformation were among both anvils coupled.
Before evaluation of the frequency was done static calculation, which gives results of initial state of pre-stressed frame. The results of this calculation were then used as input conditions for modal analysis. [4, 5, 6]
3.1. Press1
First modal shape 6,496 Hz Second modal shape 7,955 Hz Third modal shape 11,208 Hz
Fig. 3. Modal shapes- press1.
内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看
888 Karel Raz et al. / Procedia Engineering 100 ( 2015 ) 885 – 890
Fig. 5 shows first three modal shapes for hydraulic press with pre-stressed four-column frame and upper drive. First modal shape (6,496 Hz) corresponds to moving of the press in the direction of the axis of the press table. Second modal shape (7,955 Hz) corresponds to moving of the press in a direction perpendicular to the axis of the table. Third modal shape (11,208 Hz) corresponds to twist around the vertical machines axis.
3.2. Press2
First modal shape 2,112 Hz Second modal shape 3,893 Hz Third modal shape 6,680 Hz
Fig. 4. Modal shapes- press2.
Fig. 6 shows first three modal shapes for hydraulic press with pre-stressed two-column frame and upper drive. First modal shape (2,112 Hz) corresponds to moving of the press in the direction of the axis of the press table. Second modal shape (3,893 Hz) corresponds to moving of the press in a direction perpendicular to the axis of the table. Third modal shape (6,680 Hz) corresponds to twist around the vertical axis machines.
3.3. Press3
First modal shape 7,615 Hz Second modal shape 12,644 Hz Third modal shape 14,262 Hz
Fig. 5. Modal shapes- press3.
内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看
Karel Raz et al. / Procedia Engineering 100 ( 2015 ) 885 – 890 889
Fig. 7 shows first three modal shapes for hydraulic press with pre-stressed two-column frame and bottom drive. First modal shape (7,615 Hz) corresponds to moving of the press in the direction perpendicular to the crossbeam’s orientation. Second modal shape (12,644 Hz) corresponds to moving of the press in the direction of the crossbeams. Third modal shape (14,262 Hz) corresponds to moving of upper part of press.
3.4 Press4
First modal shape 2,760 Hz Second modal shape 4,682 Hz Third modal shape 6,794 Hz
Fig.6 Modal shapes- press4
Fig. 8 shows first three modal shapes for hydraulic press with pre-stressed two-column frame and upper drive. First modal shape (2,760 Hz) corresponds to moving of the press in the direction of the axis of the press table. Second modal shape (4,682 Hz) corresponds to moving of the press in the direction of the perpendicular to axis of the press table. Third modal shape (6,749 Hz) corresponds to vibrating of anchors.
4. Summary
In tab.1 is comparing of first natural frequencies for all designs of hydraulic press. It show us toughness of all designs and it is suitable for designers during design process.
Table 1. First natural frequencies.
Press type
Press 1 Press 2
Press 3
Press 4 First natural frequency 6,5 Hz 2,1 Hz 7,6 Hz 2,8 Hz
Frequently discussed question is also influence of model size on modal shapes. When considering one design of
内容需要下载文档才能查看 内容需要下载文档才能查看 内容需要下载文档才能查看hydraulic press we made the same one, but with bigger (using scale function).
下载文档
热门试卷
- 2016年四川省内江市中考化学试卷
- 广西钦州市高新区2017届高三11月月考政治试卷
- 浙江省湖州市2016-2017学年高一上学期期中考试政治试卷
- 浙江省湖州市2016-2017学年高二上学期期中考试政治试卷
- 辽宁省铁岭市协作体2017届高三上学期第三次联考政治试卷
- 广西钦州市钦州港区2016-2017学年高二11月月考政治试卷
- 广西钦州市钦州港区2017届高三11月月考政治试卷
- 广西钦州市钦州港区2016-2017学年高一11月月考政治试卷
- 广西钦州市高新区2016-2017学年高二11月月考政治试卷
- 广西钦州市高新区2016-2017学年高一11月月考政治试卷
- 山东省滨州市三校2017届第一学期阶段测试初三英语试题
- 四川省成都七中2017届高三一诊模拟考试文科综合试卷
- 2017届普通高等学校招生全国统一考试模拟试题(附答案)
- 重庆市永川中学高2017级上期12月月考语文试题
- 江西宜春三中2017届高三第一学期第二次月考文科综合试题
- 内蒙古赤峰二中2017届高三上学期第三次月考英语试题
- 2017年六年级(上)数学期末考试卷
- 2017人教版小学英语三年级上期末笔试题
- 江苏省常州西藏民族中学2016-2017学年九年级思想品德第一学期第二次阶段测试试卷
- 重庆市九龙坡区七校2016-2017学年上期八年级素质测查(二)语文学科试题卷
- 江苏省无锡市钱桥中学2016年12月八年级语文阶段性测试卷
- 江苏省无锡市钱桥中学2016-2017学年七年级英语12月阶段检测试卷
- 山东省邹城市第八中学2016-2017学年八年级12月物理第4章试题(无答案)
- 【人教版】河北省2015-2016学年度九年级上期末语文试题卷(附答案)
- 四川省简阳市阳安中学2016年12月高二月考英语试卷
- 四川省成都龙泉中学高三上学期2016年12月月考试题文科综合能力测试
- 安徽省滁州中学2016—2017学年度第一学期12月月考高三英语试卷
- 山东省武城县第二中学2016.12高一年级上学期第二次月考历史试题(必修一第四、五单元)
- 福建省四地六校联考2016-2017学年上学期第三次月考高三化学试卷
- 甘肃省武威第二十三中学2016—2017学年度八年级第一学期12月月考生物试卷
网友关注
- 浅谈企业人力资源薪酬管理
- 物流管理论文
- 建立中小企业科学的薪酬管理制度
- 构建汽车技术创新实验室的实践
- 对企业薪酬管理中的问题探讨
- 对上海星盾干洗机场薪酬管理的思考
- MLL公司走向国际高端皮具市场的竞争策略研究
- 济南国基食品有限公司薪酬管理的研究
- 关于电力施工企业项目经理绩效管理研究
- 中国光大银行薪酬管理问题与对策分析
- 2012年薪酬管理论文
- (转)向精细化管理要收入 - 论文_0
- 基于微信的教务管理系统APP论文
- 关于办公自动化软件在管理工作中的应用的论文
- 政府危机管理中的新媒体运用策略
- 浅谈我国企业薪酬管理制度的创新
- 管理论文:以案管部门为平台对检察机关纵向法律监督模式探索
- 新形势下矿业公司薪酬管理中若干问题的分析
- 浅议保险代理人薪酬管理存在的问题及对策
- 税收信息化建设的问题及对策 - 论文
- 浅析国有垄断企业高管薪酬管理存在的问题
- 管理论文:关于乡镇党委书记队伍建设的现状与思考
- 薪酬管理制度在煤炭企业安全生产中的作用
- A公司薪酬管理体系的设计
- 论高校学生思想教育管理的论文
- 浅析我国中小企业的薪酬管理
- 国企薪酬管理中存在问题及对策
- 福斯特的教育管理批判理论观点述评
- (转)向精细化管理要收入 - 论文
- 人力资源管理中的薪酬管理
网友关注视频
- 化学九年级下册全册同步 人教版 第25集 生活中常见的盐(二)
- 冀教版小学数学二年级下册第二单元《有余数除法的竖式计算》
- 人教版历史八年级下册第一课《中华人民共和国成立》
- 二年级下册数学第三课 搭一搭⚖⚖
- 《小学数学二年级下册》第二单元测试题讲解
- 河南省名校课堂七年级下册英语第一课(2020年2月10日)
- 沪教版八年级下次数学练习册21.4(2)无理方程P19
- 沪教版八年级下册数学练习册21.4(1)无理方程P18
- 外研版英语七年级下册module3 unit2第一课时
- 六年级英语下册上海牛津版教材讲解 U1单词
- 青岛版教材五年级下册第四单元(走进军营——方向与位置)用数对确定位置(一等奖)
- 北师大版八年级物理下册 第六章 常见的光学仪器(二)探究凸透镜成像的规律
- 冀教版英语五年级下册第二课课程解读
- 冀教版小学英语五年级下册lesson2教学视频(2)
- 沪教版牛津小学英语(深圳用) 四年级下册 Unit 8
- 外研版英语三起6年级下册(14版)Module3 Unit2
- 第12章 圆锥曲线_12.7 抛物线的标准方程_第一课时(特等奖)(沪教版高二下册)_T274713
- 第19课 我喜欢的鸟_第一课时(二等奖)(人美杨永善版二年级下册)_T644386
- 沪教版牛津小学英语(深圳用) 五年级下册 Unit 12
- 冀教版小学英语四年级下册Lesson2授课视频
- 沪教版牛津小学英语(深圳用) 四年级下册 Unit 4
- 【部编】人教版语文七年级下册《过松源晨炊漆公店(其五)》优质课教学视频+PPT课件+教案,辽宁省
- 沪教版牛津小学英语(深圳用) 四年级下册 Unit 3
- 【部编】人教版语文七年级下册《泊秦淮》优质课教学视频+PPT课件+教案,湖北省
- 三年级英语单词记忆下册(沪教版)第一二单元复习
- 化学九年级下册全册同步 人教版 第22集 酸和碱的中和反应(一)
- 【部编】人教版语文七年级下册《过松源晨炊漆公店(其五)》优质课教学视频+PPT课件+教案,江苏省
- 二次函数求实际问题中的最值_第一课时(特等奖)(冀教版九年级下册)_T144339
- 北师大版数学四年级下册3.4包装
- 【部编】人教版语文七年级下册《老山界》优质课教学视频+PPT课件+教案,安徽省
精品推荐
- 2016-2017学年高一语文人教版必修一+模块学业水平检测试题(含答案)
- 广西钦州市高新区2017届高三11月月考政治试卷
- 浙江省湖州市2016-2017学年高一上学期期中考试政治试卷
- 浙江省湖州市2016-2017学年高二上学期期中考试政治试卷
- 辽宁省铁岭市协作体2017届高三上学期第三次联考政治试卷
- 广西钦州市钦州港区2016-2017学年高二11月月考政治试卷
- 广西钦州市钦州港区2017届高三11月月考政治试卷
- 广西钦州市钦州港区2016-2017学年高一11月月考政治试卷
- 广西钦州市高新区2016-2017学年高二11月月考政治试卷
- 广西钦州市高新区2016-2017学年高一11月月考政治试卷
分类导航
- 互联网
- 电脑基础知识
- 计算机软件及应用
- 计算机硬件及网络
- 计算机应用/办公自动化
- .NET
- 数据结构与算法
- Java
- SEO
- C/C++资料
- linux/Unix相关
- 手机开发
- UML理论/建模
- 并行计算/云计算
- 嵌入式开发
- windows相关
- 软件工程
- 管理信息系统
- 开发文档
- 图形图像
- 网络与通信
- 网络信息安全
- 电子支付
- Labview
- matlab
- 网络资源
- Python
- Delphi/Perl
- 评测
- Flash/Flex
- CSS/Script
- 计算机原理
- PHP资料
- 数据挖掘与模式识别
- Web服务
- 数据库
- Visual Basic
- 电子商务
- 服务器
- 搜索引擎优化
- 存储
- 架构
- 行业软件
- 人工智能
- 计算机辅助设计
- 多媒体
- 软件测试
- 计算机硬件与维护
- 网站策划/UE
- 网页设计/UI
- 网吧管理