Quality Prediction and Discussion of an Abrasive Flow Precision Polishing Baffle Servo Valve Nozzle Based on Orthogonal
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https://doi.org/10.1007/s11837-020-04219-z Ó 2020 The Minerals, Metals & Materials Society
TECHNICAL ARTICLE
Quality Prediction and Discussion of an Abrasive Flow Precision Polishing Baffle Servo Valve Nozzle Based on Orthogonal Experiments JUNYE LI ,1,2 HENGFU ZHANG,1,3 LILI WEI,1,4 YANG LIU,1,5 XINMING ZHANG ,1,6 and WEIHONG ZHAO1,7 1.—Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing, Changchun University of Science and Technology, Changchun 130022, China. 2.—e-mail: [email protected]. 3.—e-mail: [email protected]. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]. 6.—e-mail: [email protected]. 7.—e-mail: [email protected]
Through range and variance analyses of an orthogonal experiment, the key factors of abrasive flow precision polishing (AFPP) are confirmed. The influence of grinding speed, abrasive concentration and abrasive particle size parameters on AFPP is secondary to action factors. The optimum AFPP process parameters are obtained. Under these parameters, the Ra value of the surface roughness of the nozzle orifices is acceptable. From 0.679 lm before abrasive flow polishing (AFP) to 0.143 lm, the quality of small holes improved obviously. The quality prediction model of the AFPP baffle servo valve is established through experimental research and data calculation, which can effectively predict the surface quality of the AFP baffle servo valve nozzle. The results of the AFP experiment show that the prediction model is effective and feasible and can obtain the best surface quality. The research results can provide theoretical guidance and technical support for the development of quality control technology of AFPP nozzles.
INTRODUCTION With the rapid development of science, technology and the economy, the processing accuracy in aerospace, national defense science and technology, civil machinery and other fields has been constantly improved, while the accuracy of traditional processing methods increasingly cannot meet people’s needs. Therefore, abrasive flow polishing technology is emerging as the times require. It is a very representative precision machining method. The process of micro-cutting through the contact between the abrasive and workpiece makes the workpiece inner surface smooth, thereby improving the workpiece accuracy.1–4 Micro-hole parts are widely used in the manufacturing industry, and their processing accuracy and surface performance requirements are increasing. As a key part of the servo valve, the baffle servo valve nozzle has a series of advantages, such as smooth operation, high control accuracy and fast response, which are
widely used in many fields.5 The surface quality of key parts often determines the overall service performance, so it is particularly urgent to improve the surface quality of parts to reduce the wear of parts and improve their matching accuracy, fatigue strength and corrosion resistance.6,7 AFPP technology has distinct advantages for polishing microholes, which can improve the finishing accuracy of the servo valve nozzle an
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