A processing method for the conical section of the small nozzle

Abstract

The invention discloses a machining method used for a tapered section of a small-dimension nozzle. The machining method is used for machining a variable-section nozzle of a centrifugal spray nozzle of an aero-engine and an inner cavity molded surface of the tapered section connected with the nozzle. The machining method comprises the following steps: utilizing a turn-milling combined machining machine cutter to carry out rough machining on two ends of a raw material rod; utilizing a fine buried drill to machine a transitional circular arc, so that a variable-section nozzle area has the same machining allowance; and finally, utilizing a boring cutter to carry out reverse hook-boring machining. The machining method disclosed by the invention utilizes fine buried drill machining to obtain the same machining allowance, so that a cutter breaking accident caused by uneven thickness of a machining area is avoided, yield is increased and cost is reduced. Meanwhile, a reverse hook-boring machining process is utilized, and scrap iron generated by machining is outwards exhausted, so that the scrap iron is prevented from scratching the machined molded surface, thereby further improving machining precision and yield.

Description

technical field [0001] The invention relates to a precision machining method, in particular to a precision machining method applicable to small-sized jet nozzles of aero-engines, in particular to a machining method for small-sized nozzle conical sections. Background technique [0002] The structure of the nozzle of the centrifugal nozzle of the aero-engine is characterized by the variable section of the inner cavity, and the variable section is connected with the micro-sized nozzle, and the dimensional accuracy is high. Requirements, it is difficult to process multiple processes such as turning, milling, grinding, clamping, grinding, polishing, etc. in conventional processing technology, especially because the size of the nozzle is small, and the size of the positioning surface and clamping surface of the part is also small, which is not good It is difficult to guarantee the size and technical conditions of the parts after clamping and clamping for many times, and it is easy...

AI Technical Summary

Problems solved by technology

The traditional method is to ensure the roughness of the inner cavity by manual grinding, while manual grinding has a high level of operation for workers, low processing efficiency and heavy workload, and it is difficult to control the size and technical conditions

Furthermore, due to the complex structure and small size of the internal surface of the nozzle, iron filings are not easy to discharge, and slight hooks, scratches, scratches, burrs, and gaps directly affect the spray angle of the centrifugal nozzle and the unevenness of fuel.

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