The horizontal machining center coaxial hole turning processing is aligned, and in the production, parts with high coaxial hole system accuracy and large span are often encountered. Such coaxial holes are difficult to machine. If it is processed on a vertical machine tool and boring is used, it is impossible to find a suitable boring bar. Due to the slender and poor rigidity of the boring bar, it is difficult to ensure the machining accuracy of the coaxial hole system. Coaxiality and surface roughness cannot be guaranteed with extended drills. In addition, due to the turning and clamping process, it is difficult to guarantee the coaxiality and parallelism of the holes. Therefore, processing by conventional methods not only cannot meet the requirements of drawings, but also brings certain losses to production.
In production, it is generally clamped once with a horizontal machining center or horizontal boring machine, and then rotated 180 degrees through the rotary table. This method can not only meet the production efficiency requirements, but also ensure product quality. However, how to find the right coordinates in the U-turn machining has always been a problem in the machining process.