液晶玻璃双刀轮切割及其裂纹产生、扩展规律  

Liquid Crystal Glass Substrate Cutting Based on Double Scribe-Wheels and Its Crack Initiation and Propagation Laws

作　　者：万珍平[1] 张昆 冯俊元[1] 卿剑波[1] 付永清 WAN Zhen-ping;ZHANG Kun;FENG Jun-yuan;QING Jian-bo;FU Yong-qing(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;School of Design,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]华南理工大学设计学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2017年第12期99-105,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51775198)~~

摘　　要：液晶玻璃基板切割是液晶显示器制造的关键工艺之一.为了实现液晶玻璃基板的高效、高质量精密切割,提出了基于双刀轮的液晶玻璃基板切割新方法,即利用第一刀轮在待切割表面刻划出微塑性刻痕,再利用第二刀轮沿塑性刻痕切割玻璃.通过印压实验获得对称楔形压头印压液晶玻璃时仅产生塑性刻痕而不产生裂纹的临界载荷,然后研究对称楔形压头沿着第一次印压产生的塑性刻痕进行二次印压时裂纹的产生和扩展规律.结果表明:二次印压没有横向裂纹产生,产生的垂直裂纹长度随一次印压载荷的增大略有增大,随二次印压载荷的增加线性增加;无横向裂纹产生使得双刀轮切割时能够获得无边崩和微裂纹的、边缘整齐的断口形貌,垂直裂纹长度的增加使得双刀轮切割时无需二次裂片.The liquid crystal display(LCD)glass substrate cutting is one of the key LCD screens.In order to achieve highly-efficient and high-quality precision cutting of LCD gass substrates,a new LCD glass substrate cutting method based on double scribe-wheels is proposed,in which the first scribe-wheel is used to scribe a plastic groove on the cutting surface and then the scribed LCD glass substrate is cut by the second scribe-wheel along the plastic groove.Then,the critical load of medial crack initiation is determined by the indentation experiments using a symmetric wedge,and the crack initiation and propagation laws during of the symmetrical wedges along the plastic groove that is generated in the Experimental results show that(1)no lateral cracks occur during the second indentation;vertical cracks increases slightly with the increase of the load imposed in the first with the increase of the load imposed in the second indentation;(3)when no lateral cracks occur,it is possible to obtain the perfect fractographs without edge chippings or microcracks[1];and(4)the length increase of the vertical cracks makes the splitting of the substrate on the flip side unnecessary during the second cutting based on the double scribe-wheels.

关 键 词：液晶玻璃 切割 印压 裂纹 

分 类 号：TQ171[化学工程—玻璃工业]