Numerically-controlled processing method of nozzle housing piece

Abstract

The invention discloses a numerically-controlled processing method of a nozzle housing piece. According to the method, a numerically-controlled machining/milling combined processing center is adopted and comprises two main shafts and an on-line measurement device; the workblank of the nozzle housing piece is a die-forged part, and the die-forged part is made of a nickel-based high-temperature alloy. The method comprises the following steps: designing a nozzle housing processing path; performing polishing treatment on the die-forged part to remove burrs from the die-parting face and end-face die-drawing taper; coarsely machining the tail part of the work piece; performing numerically-controlled machining/milling on the whole work piece; performing numerically-controlled fine machining of the head part of the work piece; cleaning and marking the work piece; and inspecting. The method provides the reasonable designs of processing path and processing method of the work piece as well as the processing positioning reference of the work piece, and completes the processing of the inner cavity, the outer circle, the lateral adapter, the positioning pin and other parts of the nozzle housing piece within one-step loading process. The method solves the problem that the die-forged part has a complex structure and a thin wall and has strict requirements for dimensional precision and positional precision; and overcomes the defects of long processing period, low production efficiency and poor dimensional precision and positional precision.

Description

technical field [0001] The invention relates to the technical field of aircraft engine manufacturing, in particular to a numerical control machining method for a nozzle housing workpiece. Background technique [0002] Die forgings for nozzle shell parts have complex structures, thin walls, high requirements for dimensional accuracy and position accuracy, and the materials are difficult to process. For example, the structure of an engine nozzle shell is complex, such as figure 1 , 2 As shown, the blank is a die forging, figure 2 Among them, 2 is the outer circle of the workpiece tail, 29 is the burr, and 6 is the outer circle of the workpiece head. The material is a nickel-based superalloy that is difficult to machine. Since there are four oil inlet joints and a positioning pin 15 on this part, the technical requirements are very high. , the coaxiality of the internal thread 7 to the inner hole 3 (D) of the head is not greater than φ0.03mm, the verticality of the end surfa...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of long processing cycle, low production efficiency, low dimensional accuracy and low position accuracy of die forgings of nozzle housing parts whose blank is die forgings, the invention provides a numerical control machining method for nozzle housing workpieces

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