Special flexible fixture for machining vibration control of complex thin-wall blade parts

Abstract

The invention discloses a special flexible fixture for machining vibration control of complex thin-wall blade parts. The special flexible fixture comprises a bottom plate, wherein a double-pressing plate linkage mechanism, an auxiliary supporting mechanism and a multi-point ejector pin clamping mechanism are sequentially arranged on the bottom plate from left to right; a plurality of the auxiliarysupporting mechanisms are provided; the height of each auxiliary supporting mechanism is adjustable. According to the special flexible fixture, the multi-point ejector pin clamping mechanism is adopted, and the problem that the thin-wall part of the free curved surface is difficult to clamp is solved.; on the basis of positioning and clamping, a magneto-rheological material with controllable performance is adopted, small displacement sensitivity, high output damping and good high-frequency response performance of cutting machining are adopted to control the damping support, so that the rigidity of the machining process is enhanced, and the machining precision of the workpiece is improved; and when a similar part of another size is machined, under the condition that the layout condition ofthe original fixture is not changed, the magnetic rheological damper with different sizes can be replaced by adjusting the distance between the multi-point clamping mechanisms, so that the clamping of the existing workpiece can be met.

Description

technical field [0001] The invention belongs to the technical field of machining complex thin-walled parts, and in particular relates to a special flexible fixture for vibration control of complex thin-walled blade parts. Background technique [0002] Aeroengines are sophisticated and complex high-end equipment, and their parts work in harsh environments such as high temperature, high pressure, and high speed. In order to meet their performance requirements such as high performance and high reliability, high-precision machining of aeroengine parts is required. In the aviation industry, a large number of thin-walled parts with complex free-form surfaces are used to achieve the goals of weight reduction, compact structure, and excellent overall performance. However, thin-walled parts have the characteristics of complex structure and poor rigidity. At the same time, there are non-uniform clamping force and clamping residual stress in the application process of the fixture, and ...

AI Technical Summary

Problems solved by technology

However, the external output damping of this device is a fixed value. When processing thin-walled parts, the geometric structure and quality of the workpiece are changing with the material removal, which will cause the selected initial cutting parameters to fail to make the cutting process stable. However, the methods proposed in the literature are not adjustable, and cannot compensate for the temporal and spatial changes in the dynamic characteristics of the cutting system caused by material removal, and cannot avoid the occurrence of Instability such as flutter

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