Application Scheme of Laser Cutting on Body-in-white

Tao Qiushi, Shi Pengcheng, Chen Chuankai, Xu Yajie

（SAIC-GM Vehicle Manufacturing Engineering Department, Shanghai 201208） Abstract：an online laser cutting scheme for body-in-white is presented to shorten the dimension chain of body front parts and improve the relative position accuracy of locating holes. The vision robot is used to measure the position of locating holes on the body side. After computer processing, the laser cutting robot is guided to reach the position of holes and complete the cutting. Temperature compensation method is adopted to reduce the influence of robot and environmental temperature changes on measurement results, and the isolation floor is used to prevent the impact on measurement system from work shop vibration. The scheme reserves space for flexible modification, can meet the cutting requirements of different sizes and shapes of locating holes, no need to add hardware, shorten debugging cycle and low cost.

Key words: Laser cutting, Vision, Flexible, Locating hole

1 前言

冲压钣金零件或者分总成零件通过车身车间的多种连接工艺加工成为白车身总成。由于制造误差的累积，零件上的定位孔相对于整车的装配位置就会产生波动，影响后续以此为基准的零件装配质量。如果想要缩短尺寸链，就要在车间内根据车身尺寸状态来加工零件上的安装孔。目前，白车身上使用的孔加工方法主要有冲孔和激光切割两种方法。激光切割相对于冲孔具有高柔性，高精度，低调试成本的特点。本研究方案采用

了在线激光切割技术，配合视觉测量引导系统，完成前机舱前端上横拉杆总成定位孔的切割工艺。2 激光切割工艺介绍

激光切割是利用高能量密度的激光束，辐照工件表面产生热量，熔化金属，并利用与光束同轴的高压气体直接除去熔融金属，从而达到分离材料的目的,如图1

所示。激光加工的特点为激光束能量高度集中，加工区域小，因而热变形小，加工质量高、精度高，加

工件不受尺寸、形状限制，噪声小，效率高[1]。

作者简介：陶秋实（1987—），男，助理工程师，学士学位，研究方向为汽车制造技术。

参考文献引用格式：

陶秋实, 石鹏程, 陈传凯, 等. PLC控制系统车型传递程序的开发与应用[J].汽车工艺与材料, 2021（6）：24-27.

焊装线

TAO Q, SHI P, CHEN C, et al. Application Scheme of Laser Cutting on Body-in-white [J]. Automobile Technology & Material, 2021(6): 24-27.