目 录
前 言 .......................................................... 1 1.绪 论 ....................................................... 2
1.1选题背景 .............................................................. 2 1.2课题目的 .............................................................. 2 1.3课题意义 .............................................................. 2 1.4应解决的问题 .......................................................... 2 1.5电火花加工的应用和发展趋势 ............................................ 3 1.6设计的指导思想 ........................................................ 3
2.电火花加工技术 ............................................... 4
2.1电火花加工的原理 ...................................................... 4 2.2电火花加工的特点 ...................................................... 5 2.3电火花加工的应用 ...................................................... 5
3.DM7140型电火花成型机床介绍 ................................... 5
3.1机床部分 .............................................................. 6
4.系统方案分析 ................................................. 6 5.设计相关说明 ................................................. 7
5.1工作液 ................................................................ 8 5.2材料的选择 ............................................................ 8 6.1箱门的设计 ........................................................... 10 6.2液位控制器的设计 ..................................................... 11 6.3回油设计 ............................................................. 12 6.4油箱内工作台的设计 ................................................... 13 6.5油箱内搅拌管的设计 ................................................... 14 6.6箱门挡块的设计 ....................................................... 15
6.7回油槽的设计 ......................................................... 15 6.8管子托架的设计 ....................................................... 16 6.9拉紧扣的设计 ......................................................... 16 6.10左侧板的设计 ........................................................ 17 6.11箱体底板的设计 ...................................................... 17 6.12箱体后板的设计 ...................................................... 17 6.13装配图 .............................................................. 18
7.储油箱设计 .................................................. 20
7.1外形尺寸设计 ......................................................... 20 7.2供液泵、搅拌泵和过滤泵的选择 ......................................... 20 7.3过滤器的选择 ......................................................... 20 7.4管道的选择 ........................................................... 21 7.5底板的设计 ........................................................... 21 7.6左侧板的设计 ......................................................... 22 7.7右侧板的设计 ......................................................... 22 7.8搅拌管的设计 ......................................................... 23 7.9装配图 ............................................................... 23
设计总结 ...................................................... 25 参考文献 .................................................... ２７
聊城大学东昌学院本科毕业论文（设计）
摘 要
DM7140机床采用普通煤油电火花加工后的工件，表面质量较差，有一层厚度不均匀、含有较多微观裂纹和残余拉应力的白层，降低了加工表面的疲劳强度，用于模具生产时严重影响了模具的使用寿命，必须进行抛光等后续的处理工序。另外，电火花加工面积较大时，加工过程往往不稳定，对机床和待加工件都有不良的影响。
由于现在混粉电火花加工这一新技术的快速发展，同时对这种混粉加工液的循环过滤使用提出了更高的要求，实现混粉电火花加工的技术关键是混粉工作液系统的研制。混粉工作液必须有与之配套的过滤装置，才能保证混粉电火花加工的实现。
该循环处理系统可以实现:
1、混粉电火花加工时，可分离出混粉工作液中80%以上的加工渣，实现混粉加 工在线除渣。
2、更换混粉工作液或从混粉加工向普通加工转换时，可分离粉末添加剂和加工 渣，实现工作液的再次利用。
3、普通电火花加工时，可将加工渣从工作液中分离，实现普通工作液在线除渣。 关键词：DM7140；工作液；循环过滤；
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聊城大学东昌学院本科毕业论文（设计）
Abstract
Serious DM7140 machine ordinary kerosene EDM workpiece surface quality is poor, uneven layer thickness of white layer contains more micro-cracks and residual tensile stress reduces the fatigue strength of the machined surface for the mold productionaffect the life of the mold, the need for subsequent polishing and other treatment processes.In addition, the larger EDM machining process often unstable, machine tools and to be processed, have adverse impact.
The key technology of this powder mixed working fluid circulation and filtering due to the rapid development of this new technology of powder mixed EDM higher demands on powder mixed EDM is a powder mixed working fluid systemDevelopment.The mixed powder, the working fluid must have a complete set of filtering device, in order to ensure the realization of powder mixed EDM.
The circulation of the fluid handling system can be achieved:
1.Mixing powder EDM, detachable powder mixed working fluid for more than 80% of the processing slag, mixing powder plus work online slag removal.
2.Replacement powder mixed fluid or converted from a mixed powder processing to ordinary processing, detachable powder additives and processingslag, the working fluid used again. 3.Ordinary EDM processing residue separated from the working fluid to achieve a common working fluid deslagging.
Keywords: DM7140; working fluid; loop filter
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聊城大学东昌学院本科毕业论文（设计）
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