A self-adaptive auxiliary fixture for deformation control in blade machining
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ORIGINAL ARTICLE
A self-adaptive auxiliary fixture for deformation control in blade machining Qinglong Hao 1 & Qian Yang 1 Received: 23 April 2020 / Accepted: 24 September 2020 / Published online: 13 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract The aero-engine blades are mostly thin-walled with complex structures, which are prone to flutter, deformation during processing. All these characteristics make it difficult to machine the blade qualified. In order to improve the precision and efficiency of blades machining, a self-adaptive clamp machining process method is proposed in this paper. Then a self-adaptive auxiliary fixture of low-melting-point alloy which have simple structures is firstly designed based on the self-adaptive clamp method. The blade machining experiments of the low-melting-point alloy auxiliary fixture are carried out. And the experimental results show that the self-adaptive clamp method can improve both precision and efficiency in blade machining. But the low-melting-point alloy auxiliary fixture is still cumbersome and danger to the operators. Therefore, through analyzing the deformation in blade machining, an improved self-adaptive auxiliary fixture which is safe, efficient, and easy operated is re-designed. Keywords Blade machining . Deformation control . Self-adaptive clamp method . Self-adaptive auxiliary fixture . Low-melting-point alloy
1 Introduction As one of the core components of aero-engine, the machining precision and quality of blades play a vital role on the engine’s service performance and longevity. The manufacture of blades is a challenging scientific problem due to the characteristics of blade such as thin-walled, sculptured surfaces, and difficultto-cut materials which make the blades easily to deform during the machining process. In order to address these challenges, many researchers conducted a lot of study in the aspects such as parameter optimization machining clamping, deformation prediction, and error compensation. Fixtures are usually used to locate and secure workpieces during machining process. As one of the important parts of the process system, fixtures have a significant influence on the machining precision and efficiency. Designing, analyzing, and amendment of the workpiece-fixture system have attracted a lot of attention and already been one of the most
* Qinglong Hao [email protected] 1
School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China
important subjects in the mechanical engineering research fields to improve the machining precision. Based on the genetic algorithm, Chen et al. [1] established a dual optimization model of fixture layout and dynamic clamping force which can reduce the machining deformation and improve the distribution condition effectively. Investigating the effects of various clamping methods on the machining precision of thinwalled Ti6Al4V components, Delporta [2] proposed a new clamping method which provided a better support for the workpiece. In order to red
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