Milling cutter suitable for the layered milling process of the overall blisk structure profile

Abstract

The invention discloses a milling cutter suitable for layered milling forming process of an integral leaf disk structural profile. The milling cutter comprises a cuter body and a cutter bit, wherein four spiral bodies for grinding a milling cutter edge are designed on the cutter bit, two symmetrical spiral bodies are used for grinding the milling cutter edge adopting a spherical structure and used for rough milling machining of the leaf disk structural profile, a step is machined on each of other two symmetric spiral bodies, the milling cutter edge is grinded on the spiral bodies with the steps, the milling cutter edge is used for fine milling machining of the leaf disk structural profile, and the end part of the whole cutter bit is in the shape of a bulb nose. A milling technological method of the integral leaf disk structural profile developed by an applicant is combined with the milling cutter designed by the invention for machining the structural profile of the integral leaf disk, so that the machining quality and machining production efficiency of the integral leaf disk structural profile are greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the manufacturing and processing technology of an aero-engine blisk, in particular to a milling cutter suitable for the milling process of an integral blisk structure profile. Background technique [0002] With the development of aero-engine technology, a blisk with an integral structure has appeared in the aero-engine to replace the blisk with a traditional assembly structure. The overall blisk has a complex structure and requires high machining accuracy, especially the working surface of the blade is a free-form surface in space, and its shape is extremely complex. Especially in order to adapt to its high-pressure, high-speed working conditions, its materials are widely used in titanium alloys, titanium-based composite materials, Composite materials that are difficult to machine such as titanium aluminide composite materials have extremely poor machinability of the overall blisk structure. [0003] At present, the manufactur...

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Problems solved by technology

[0005] 2) During finishing machining, the blade is a twisted structure with variable cross-section, long blade span and thin blade, resulting in extremely poor rigidity at the tip of the blade, and the cutting force acts on the end of the blade span, which is prone to elastic deformation and accompanied by vibration , it is difficult to guarantee the size, and different tool positions have different effects on the processing and springback of thin blades, which can directly lead to out-of-tolerance thickness dimensions; while machining chatter can cause vibration patterns on the surface of the blade, and it is easy to cause tool chipping, seriously Affects the surface quality of the blade

[0006] 3) The blade shape of most integral blisks is only 0.2-0.3mm thick at the inlet and outlet edges. When the finishing process is in progress, the blade has no strength to rely on. Overcutting, sharp edges, shrinkage, and Phenomenon such as blunt edge

Cause the part size to be out of tolerance or even scrapped

[0007] 4) During semi-finishing and finishing machining, the force deformation of the curved surface is affected by many factors, and it is extremely difficult to analyze it directly

Therefore, the method of pouring construction glue between the blade channels is adopted to change the damping characteristics of the parts and reduce the vibration of the blade; but in fact, when pouring construction glue, it depends on the operator, and different operators pour The quality of the blades is inconsistent, and even the quality of different blades poured by the same operator is not uniform, and the construction glue contains non-ferrous metals, which will pollute the titanium alloy

[0008] Therefore, the traditional mechanical processing method is no longer competent, and it is necessary to explore new processing technology and design cutting tools suitable for new processing technology.

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