The casing is one of the key components in the aeroengine. It is a typical complex thin-walled structure, and has the characteristics of large component size, many structural elements, complex profile, huge measurement workload, thin structure and easy deformation, and high precision. The requirements of measuring efficiency and measurement accuracy are getting higher and higher. At present, the three-coordinate measuring machine (CMM) is widely used to measure aeroengine casing in China's aeroengine manufacturers. Taking some casing as an example, CMM is required to measure 256 items, and the measuring period is more than 1 day. In order to reduce the workload and improve the efficient in measuring aeroengine casing, the research develops a multi-axis measuring system based on a high-precision turntable, which has been improved to meet the performance. At the same time, the error of the multi-axis measurement system is discussed to achieve high precision and high efficiency measurement.
The core of the high-precision aerostatic rotary table is the aerostatic bearing shafting, including radial bearing and axial bearing. The axial bearing is composed of floating plate and thrust bearings. While, the axial bearing is still processed by manual grinding in China, leading to low machining efficiency, high labor costs and difficult consistency of accuracy.
This paper presents a technology about processing high-precision aerostatic rotary table by SPDT (Single Point Diamond Turning) based on LODTM (Large Optics Diamond Turning Machine) to improve the deficiencies leading by manual grinding. The technology uses single crystal diamond cutting tools for ultra-precision machining, and thus can obtain high-precision optical mirror, which can be adopted in the aerostatic rotary table. An experiment for tin bronze samples has been done to demonstrate the availability of the technique, and a pair of high-precision thrust bearings are obtained. The precision of the thrust bearings, detected through precision optical measurement and precision coordinate measuring technology, is better than the designed requirement. The experiment results show that thrust bearings generated by deterministic ultra-precision machining technique based on LODTM will have advantages in figure accuracy and roughness and so on, which can be helpful to improve the precision and low the cost of high-precision aerostatic rotary table. The high-precision thrust bearings are processed by this way, and the high-precision aerostatic rotary table has been assembled.
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