Method for machining a stepped deep hole in an oil supply pipe

Abstract

This invention belongs to the field of aero-engine manufacturing technology and relates to a method for machining deep holes with stepped surfaces in fuel supply pipes. Based on the structure of the fuel supply pipe to be machined, a fixture is designed; hole M is drilled using a deep-hole drill; holes K and J are bored using a boring bar; the fixture is mounted on a worktable, and the positioning surface of the V-groove is aligned; holes N and M are countersunk using a combination countersink; the part is mounted on a grinding machine, and holes K and N are ground to their final dimensions; reamers are selected: the guide dimension of the reamer is designed in two groups according to hole N, and the actual diameter of hole N is measured. A reamer group with a small gap between the guide dimension of the rough reamer and the diameter of hole N is selected; each group of reamers consists of one rough reamer and one fine reamer; the fixture is mounted on and fixed on the worktable, the positioning surface of the V-groove is aligned, the outer circle of the fuel supply pipe is positioned using the positioning surface of the V-groove, and then clamped; according to the selected reamer group, hole M is first rough-reamed and then fine-reamed, completing the machining. This method solves the problem of not being able to guarantee the machining accuracy of the fuel supply pipe.

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