FIELD: process engineering.
SUBSTANCE: set of invention relates to machine building and can be used for production of pipeline branch pipes. Proposed method comprises drilling the bore in blank by rough cutting of said blank from two directions by rotary cutter. Note here that said bore features removal of allowance from bore surface from the side corresponding to inner side of flexure of angular branch pipe as a finished article. Finishing is performed in diameter on bore inner surface on end side with the help of disc cutter with arched cutting edge and OD smaller than finished bore. Besides, finishing in diameter of bore inner surface on opposite end side by feeding disc cutter from other end side and its circular feed along bore surface to be finished at spinning of disc cutter. Invention covers the design versions of angular branch pipes produced as described above.
EFFECT: branch pipe smoothly bent in axis with required depth.
13 cl, 13 dwg
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