Method for machining lip of hypersonic-speed low-noise wind tunnel nozzle

Abstract

The invention discloses a method for machining a lip of a hypersonic-speed low-noise wind tunnel nozzle. The method includes the following steps that clamping is carried out, the thickness of the lipworkpiece is measured and the length L of the lip is determined, steps of the length L of the lip are roughly turned for the first time, the steps of the length L of the lip are roughly turned for thesecond time, the steps are removed after third-time rough turning, and fine turning is carried out. According to the method for machining the lip of the hypersonic-speed low-noise wind tunnel nozzle,the rigidity of the lip workpiece is improved through a step turning process, the problem that the lip workpiece easily deforms in the machining process is avoided, meanwhile, the machining efficiency is improved in the manner of increasing the bite, and the comprehensive machining efficiency is improved by 50%.

Description

technical field [0001] The invention belongs to the technical field of hypersonic wind tunnel tests, in particular to a method for processing a nozzle lip of a hypersonic low-noise wind tunnel. Background technique [0002] The low-noise flow field provided by the hypersonic low-noise wind tunnel is close to the real atmospheric environment at high altitude, and is an ideal facility for conducting boundary layer related research. The nozzle of the hypersonic low-noise wind tunnel is the core component of the hypersonic low-noise wind tunnel, and it is the key to obtain the low-noise flow field. In the hypersonic low-noise wind tunnel nozzle, a suction flow channel is arranged in front of the smallest throat of the nozzle to absorb the boundary layer of the upstream wall of the nozzle, which effectively reduces the noise of the flow field. According to the different diameters of the current hypersonic low-noise wind tunnel, the size of the nozzle of the hypersonic low-noise ...

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Problems solved by technology

[0004] However, the small cutting amount machining method has the following fatal disadvantages for the machining of the nozzle lip of the hypersonic low-noise wind tunnel: (1) Due to the thin wall thickness of the lip and insufficient rigidity of the workpiece, when semi-finishing the inner and outer curved surfaces, the cutting force Under the action of the lip workpiece, it will cause deformation of the lip workpiece, which will affect the precision of the lip, so that the rejection rate of the lip workpiece is very high; (2) Low production efficiency

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