Tool for machining second-stage blade of free turbine of aero-engine

Abstract

The invention relates to a tool for machining a second-stage blade of a free turbine of an aero-engine. The tool comprises a base, the left side and the right side of the base are provided with a vertical left supporting part and a vertical right supporting part respectively, a chuck is arranged on the left supporting part, and a V-shaped toothed surface groove is formed in the right end face of the chuck; a top sleeve is arranged on the inner side face of the right supporting part, and a rectangular groove is formed in the left end face of the top sleeve; and a workbench at the right end of the second-stage blade is fixedly matched with the rectangular groove, and the V-shaped toothed surface groove is fixedly matched with a tenon at the left end of the second-stage blade. By means of thetool, finish machining on to-be-machined surfaces of the secondary blade can be completed on a three-axis machining center, and dependence of an existing machining method on a four-axis machining center or manual machining is avoided; the efficiency of machining the secondary blade by using the tool is high, and time is saved; and on the premise of ensuring the qualified rate of the quality of the secondary blade, the machining quality of the to-be-machined surfaces of the secondary blade is uniform.

Description

technical field [0001] The invention relates to a tooling for aeronautical processing, in particular to a tooling for processing aeroengine free turbine secondary blades. Background technique [0002] The free turbine secondary blade 4 is an important part of an aero-engine, and its material is a forged superalloy GH93; the hardness is ≥ 290, and an engine needs to be equipped with more than 60 pieces of secondary blades 4, so the manufacturer's production demand for this part Larger; the surface to be processed of the secondary blade 4 includes a leading edge 5, a trailing edge 6, a leaf basin 7, and a blade back 8, the left end portion of the secondary blade is a tenon 11, and the right end portion of the secondary blade is a workbench 12. The secondary blade 4 before processing is rough processed by electric discharge machining, and the blade shape of the secondary blade 4 is processed by EDM, and a small machining allowance is left on each surface to be processed. After ...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned method of processing the secondary blade 4 on the four-axis machining center has the following problems: when the tooling used in this processing method clamps the secondary blade 4, it is clamped in a way of clamping and topping, because the secondary blade 4 The structural shape of the surface to be processed is relatively thin, so the clamping method of one clamp and one top will cause the clamped blade 4 to receive a certain axial force and cause it to undergo elastic deformation. When the processing is completed and the tailstock is released After tipping, the internal stress on the secondary blade 4 disappears one after another. At this time, the shape of the processed blade surface produces rebound deformation and causes the processing of the secondary blade 4 to be unqualified. At the same time, the center hole used for clamping is the same A central hole, so there is a clamping error; the tool used for milling the surface to be processed of the secondary blade 4 is a D8r4 ball nose cutter, which has a small diameter and relatively poor rigidity, and at the same time due to the blade of the secondary blade 4 The machining allowance of each section of the body is inconsistent, so the cutting speed of the tool during milling is limited. The blade body of the blade 4 has no auxiliary support during milling, which further leads to serious tool vibration phenomenon, which leads to severe tool vibration phenomenon. The poor quality further limits the cutting speed of the cutting tool during processing; it takes about 5 hours to process a secondary blade 4, and the processing pass rate of the secondary blade 4 is about 30%, so the processing efficiency and processing quality of this processing method are both low. Can't achieve expected effect

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