CFRP制孔加工切屑形成过程及分类

Chip Formation Process and Classification in CFRP Drilling

为了控制切屑形成,提高CFRP吸气式内排屑系统的排屑质量,建立了二维直角切削受力模型,研究了切屑的形成过程并对切屑形状进行预测并分类,用超景深显微镜(KEYENCE VHX-1000)对切屑进行观察,通过分析可得:切屑形成的主要原因是切屑弯曲折断与剪切失效,切屑的大小一般在1.02~1.80 mm,切屑的形状主要分为条形切屑、微圆型切屑和米形切屑三种,当温度达到树脂的玻璃化温度时,切屑发生变形,会出现C形屑并伴有纤维拔出现象,除不可估算占比的米形屑外,不同形态切屑的占比大小依次为条形切屑、微圆形切屑、C形屑和纤维拔出形切屑。实验结果与理论分析结果基本相吻合。

In order to control the chip formation and improve the chip removal quality of CFRP suction type internal chip removal system,a two-dimensional right angle cutting force model was established.The chip formation process was studied,and the chip shape was predicted and classified.KEYENCE VHX-1000 was used to observe the chips.The results show that the main causes of chip formation are chip bending fracture and shear failure.The chip size is generally between 1.02~1.80 mm.The chip shape is mainly divided into strip chip,micro round chip and meter chip.When the temperature reaches the glass transition temperature of resin,the chip will deform,Cshaped chip and fiber will appear the pull-out phenomenon,the proportion of chips with different shapes is strip chip,micro round chip,C-shaped chip and fiber pull-out chip,except for the rice chip which can not be estimated.The experimental results are in good agreement with the theoretical analysis.