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Analysis of the Causes of the Outer Diameter of the Borehole in the Cyclone Milling Machine
1. Foreword A 20-M64×3-6H screw hole appears in the flange of a gasification furnace head made by our company. For larger diameter internal threads, there are generally two methods of machining. One is to tap the tap on the rocker drill press. Another method is to machine on a threaded cyclone milling machine. Since the screw hole is a blind hole, the qualified tap is used for processing by the first method, and although the tooth angle and the medium diameter size of the thread can be ensured, the improper operation and the tapping are easy to ensure the quality. Our existing threaded cyclone milling machine can only machine the internal thread of M76-M105. A small shank and cutter head were designed for this purpose. In the actual production, there is a phenomenon of medium diameter deviation when machining with a threaded cyclone milling machine. The performance of the thread plug gauge is tight when passing through the end, and the stop end is also passed and loose. The thread is clear.