Flexible clamp for controlling machining deformation of thin-wall blade and blade clamping method

Abstract

The invention provides a flexible clamp for controlling machining deformation of a thin-wall blade. The flexible clamp comprises a magnetic workbench and a clamp body capable of being attracted to themagnetic workbench, wherein the magnetic workbench is provided with a suction plane, the clamp body comprises a positioning table, a rotating joint with two rotational degrees of freedom, a clamp table and a blade clamping mechanism, one end face of the positioning table serves as a clamp positioning face and is used for being attracted to the suction plane of the magnetic workbench, the other end face of the positioning table is connected with one end face of the clamp table through the rotating joint, and a blade clamping mechanism is arranged on the other end face of the clamp table and used for clamping a blade shroud of a blank blade. According to the flexible clamp, reliable and non-prestress clamping of the blade shroud part of the blank blade can be achieved, it is guaranteed thatblade parts are not subjected to clamping prestress in other directions except for axial tension and pressure or pressure, machining deformation and vibration are restrained, clamping is stable and reliable, and the rapid loosening and re-clamping capacity is achieved.

Description

technical field [0001] The invention relates to a fixture for processing blades, in particular to a flexible fixture for controlling the processing deformation of thin-walled blades. Background technique [0002] Blade parts are widely used in the field of aero-engines, and generally have the characteristics of complex structure, poor rigidity, difficult processing of materials, high precision requirements, and high material removal rate. Due to its advantages of high machining precision and strong batch production capacity, multi-axis machining is the most important processing method to realize the manufacture of such parts. However, due to the characteristics of the blade itself, it still encounters great difficulties in processing, such as small thin-walled blades with a large aspect ratio. This type of blade is small in size, but has a large aspect ratio, and the blank is formed by precision forging with a small margin. In the processing, the blade root part is process...

AI Technical Summary

Problems solved by technology

In the processing, the blade root part is processed first through the positioning of the blade blank profile to form the positioning surface of the blade root part, and clamp it with a special fixture. If the length-thickness ratio is not large, the blade crown part is generally suspended during the processing process, but for For blades with a large length-thickness ratio, the CNC milling process of the profile is prone to processing deformation and vibration in the blade crown, resulting in poor processing accuracy and obvious surface vibration lines

On the other hand, because the thickness of the blade is very thin, it is impossible to use the traditional thimble fixing method to make the tip hole. At present, soft materials are generally used to realize the surface contact compression method, but the crown part has no fixed positioning surface, and the reliability of the compression method is poor. Sliding often occurs with soft materials, resulting in scrapped parts and low pass rate

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