一、概述图1所示的成形喷管是某高超音速风洞的主要部件。其整个型面(长3120毫米)采用列表曲线,即每隔2毫米有一直径尺寸要求,其容差为0.06毫米,从喉部最小直径φ18.3毫米到出口截面最大直径φ497.2毫米,总共1560个直径尺寸;要求圆滑衔接,光洁度为▽6。为便于加工,将成形喷管分成七段,并采用铸件毛坯。喉部段内径甚小,在数控卧车上加工,长度取短些,为166毫米。出口段内径大,用数控立车加工,长度尽量取长一些, I. Overview The forming nozzle shown in Figure 1 is the main component of a hypersonic wind tunnel. The entire profile (length 3120 mm) is tabulated, ie every 2 mm has a diameter requirement of 0.06 mm, with a minimum diameter of φ18.3 mm from the throat to a maximum diameter of φ497.2 mm at the exit cross section 1560 diameter size; requires a smooth connection, finish ▽ 6. For ease of processing, the forming nozzle is divided into seven sections, and castings blank. Throat section diameter is very small, CNC lathe processing, take shorter length, to 166 mm. Exit section diameter, with CNC vertical lathe processing, try to take longer the length of some,