多零件轴孔精密过盈装配

Multi-peg-hole precision assembly based on interference fit

摘要:

为了实现多圆环零件的高精度轴孔过盈配合装配,研制了基于力传感器、光栅尺和工业内窥镜的精密装配及检测系统．设计了柔顺夹持机构,克服了被装配零件与模具装配孔之间的径向定位偏差所引起装配卡阻,提出了装配力/刚度位置补偿方法,在被装配零件外径有10 μm制造公差的情况下实现了精确定位．对狭小无照明空间内零件的在线检测,应用内窥镜解耦视觉检测方法,通过控制内窥镜移动的光栅尺的位置信息和采集到的图像信息获得被装配环片的精确位置信息．装配和检测实验表明:圆环零件装配的误差在-9.4~6.1 μm之间,内窥镜检测的不确定度在-1.7～8.2 μm之间．所研制的系统能够满足圆环类零件的精密装配及检测要求．

Abstract:

A precise assembly and measurement system was developed and fabricated for multi-peg-holes assemble based on interference fit, in which a compliant gripping mechanism was designed to avoid the assembly jam, the force/stiffness position compensation was proposed to eliminate the fabrication tolerance deflection of 10 μm, and the ring components were precisely positioned in the assembly mold. Borescope decouple vision measurement was proposed to measure the position of assembled components in narrow and dark environment. The position information of assembled components was measured combining the information of captured image and grating rule which assembled on the linear guide driving the borescope. The experimental results show that using the developed system, the position errors of assembly were from -9.4 to 6.1 μm and the measurement errors were from -1.7 to 8.2 μm, it could meet the requirement of the precise assembly and measurement.