摘要
印制电路板(简称PCB)微孔加工质量直接决定内、外层线路连接的稳定性和可靠性,刀具结构是影响微孔加工质量的主要因素之一。本文通过改变微钻的钻尖角、第一后角和第二后角,研究了硬质合金微钻的刀具结构对高速印制电路板与柔性双面覆铜板微孔钻削的切屑形貌、钻削轴向力、微钻磨损及加工质量的影响。结果发现,高速板和柔性板切屑形貌分别呈短弯曲状和长条螺旋状;加工高速板和柔性板时,适当增大钻尖角能有效降低刀具磨损和孔壁粗糙度,还能提升孔位精度;改变第一后角对刀具磨损和孔壁粗糙度影响显著,第一后角10°的微钻加工高速板时的刀具磨损量是4.1%,在20°时的磨损量达到了17.1%;刀具第二后角对钻削特性影响不显著。在设计刀具结构时可以适当增加钻尖角降低第一后角来提高加工质量。
The quality of the micro-hole processing of the printed circuit board(PCB)directly determines the stabilityand reliability of the inner and outer circuit connections.The tool structure is one of the main factors affecting the quality ofthe micro-hole processing.In this paper,by changing the drill point angle,the primary face angle and the secondary face angleof the micro-drill,the influence of the tool structure of the carbide micro-drill on the chip morphology,the axial force of thedrilling,the wear of the micro-drill and the processing quality of the micro-hole drilling of high-speed printed circuit boardsand flexible double-sided copper clad laminates is studied.The results show that the chip morphology of the high-speed boardand the flexible board are short bends and long spirals,respectively.when high-speed boards and flexible boards areprocessed,increasing the drill point angle appropriately can effectively reduce tool wear and hole wall roughness,and alsoimprove hole position accuracy.Changing the primary face angle has a significant impact on tool wear and hole wallroughness.The tool wear amount of micro-drills with the primary face angle of 10°when machining high-speed plates is 4.1%,and the wear amount at 20°reaches 17.1%.Changing the secondary face angle has no significant effect on the drillingcharacteristics.When designing the tool structure,increasing the drill point angle and reducing the primary face angle appropriately can improve the processing quality.
作者
严冰
李之源
郑李娟
高敬辞
黄欣
王成勇
Yan Bing;Li Zhiyuan;Zheng Lijuan;Gao Jingci;Huang Xin;Wang Chengyong(Guangdong University of Technology,Guangzhou Guangdong 510006,China)
出处
《硬质合金》
CAS
2021年第6期415-423,共9页
Cemented Carbides
基金
国家自然科学基金面上项目《多层异质复合电子材料低温微细钻削加工》(51875110)
新乡市重大科技专项高端印制电路板加工用《高可靠性微细刀具制造关键技术及其产业化》(ZD19003)。
关键词
印制电路板
微孔
刀具结构
钻削性能
printed circuit board
micro hole
tool structure
drilling characteristics
