macbook电脑底板数控加工与成组工装设计
摘要 早期3C产品外壳大多采用模铸、压铸等方式成型，然而随着用户越来越追求产品的精致和轻薄，3C产品采用数控加工已是大趋势。本课题的主要研究对象macbook电脑底板，需要对其进行工艺加工规程的分析，在此基础上进行夹具的设计。产品毛胚为经过冲压工序的半成品，产品毛胚经过数控机床若干工序加工后，即为满足要求的成品。加工机床为发那科a-D21MiA小型加工中心，定位精度可达0.006-0.02mm，重复定位精度可达0.004mm，可满足产品精度要求。考虑到模具刚度和成本，初步选定模具材料为45钢。为了确保夹具的可靠性和安全性，尽可能使用机械结构，动力来源为单活塞杆普通气缸和单活塞杆旋转下压式气缸，汽源压力控制在0.5Mpa左右,夹具需要高速精确的旋转时，可考虑接入附加轴,考虑到成本应减少附加轴的数量。初步计划设计三道工序：底板边缘的铣削、支撑脚预留孔的铣削、底板各凹槽的加工，夹具设计完成后可通过NX进行运动学分析和运动模拟。
关键词：精度 成本 数控加工
CNC machining and fixture design of macbook backplane
Abstract Early 3C products use shell molding, casting molding, etc. However, as users are increasingly seeking the delicacy and light, 3C products using CNC machining is a major trend. The main object of study is the backplane of macbook, it needs to be analyzed processing technology procedures, conduct fixture design on this basis. After semi-finished products for the blank stamping process, product blank after some CNC machining process, is to meet the requirements of the finished product. We use FANUC a-D21MiA machining centers, the positioning accuracy of up to 0.006-0.02mm, repeat positioning accuracy of up to 0.004mm, the product can meet the accuracy requirements. Taking into account the cost of the mold and the stiffness, the initial selection of mold material is 45 steel. In order to ensure the reliability and safety of the fixture, as much as possible the use of a mechanical structure, the power source for the ordinary single rod and single rod cylinder rotary cylinder under pressure, steam supply pressure is controlled at about 0.5Mpa, jig requires high-speed precise rotation , consider access additional axes, taking into account the costs should be reduced by the number of additional axes. Preliminary plan designed three steps: After milling bottom edge of the support leg holes for milling, processing each floor groove, fixture design complete kinematics analysis and motion simulation via NX.
Key words precision cost CNC manufacture
目 录
第一章 产品的加工工艺规程设计
1.1产品的分析…………………………………………………………………………4
1.1.1产品的外形分析…………………………………………………………………4
1.1.2产品的工艺分析…………………………………………………………………5
1.1.3毛胚的制造形式…………………………………………………………………6
1.2工艺过程具体措施…………………………………………………………………6
1.3产品定位基准选择…………………………………………………………………6
1.4定位误差的分析……………………………………………………………………7
1.5指定工艺路线………………………………………………………………………8
1.6确定切削用量和基本工时…………………………………………………………9
1.7加工工艺小结………………………………………………………………………19
第二章 具有气动夹紧功能的专用夹具设计
2.1夹具组第一部分……………………………………………………………………21
2.1.1定位基准的选择与夹具设计……………………………………………………21
2.1.2夹具设计注意点…………………………………………………………………22
2.1.3切削力及切削功率的估算………………………………………………………23
2.1.4气缸的选择和校核………………………………………………………………25
2.1.5夹紧变形的分析…………………………………………………………………27
2.2夹具组第二部分……………………………………………………………………27
2.2.1定位基准的选择与夹具设计……………………………………………………27
2.2.2夹具设计注意点…………………………………………………………………29
2.2.3切削力及切削功率的估算………………………………………………………29
2.2.4气缸的选择和校核………………………………………………………………32
2.2.5夹紧变形的分析…………………………………………………………………32
2.3夹具组第三部分……………………………………………………………………33
2.3.1定位基准的选择与夹具设计……………………………………………………34
2.3.2夹具设计注意点…………………………………………………………………34
2.3.3切削力及切削功率的估算………………………………………………………35
2.3.4气缸的选择及夹紧变形的析……………………………………………………36
2.4本章小结……………………………………………………………………………37
结论…………………………………………………………………………………………38
致谢…………………………………………………………………………………………39
参考文献……………………………………………………………………………………40
参考文献：
[1] 张瑞峰. 镁合金超薄Notebook外壳压铸成型质量控制技术研究[D]. 上海交通大学 2009
[2] 嘉美. 数控技术在笔记本电脑外壳镁合金加工应用[N]. 中国有色金属报. 2015-05-19 (007)
[3] 李海萍. 模具数控加工技术的研究与发展[J]. 机械设计与制造. 2008(06)
[4] 赵建华,杨武刚,杨子义. 基于数控加工原型的快速模具制造工艺[J]. 电气制造. 2006(02)
[5] 谭许彬. 数控加工气缸体组件夹具设计[J]. 科技创新与应用. 2015(36)
[6] 卢树斌. 高速金属切削加工的数值模拟与分析[D]. 江苏大学 2006
http://www.bysj360.com/html/7966.html
http://www.bysj360.com/html/7956.html
