Abstract. The efficiency of throwing waste is the main performance index of pavement milling machine. Structure design, installation angle and surface treatment of the throw-out plate have a direct impact on the efficiency of throwing waste. On the full factorial design, the structural form and installation angle of the throw-out plate are the influencing factor, and the number of throwing waste is the evaluation index by dynamic analysis. The wear resistance of the improved throw-out plate is tested and analysed. At the same time, the plasma surfacing process is used to optimize and verify the wear resistance. The results show when the throw-out plate has no groove and the installation angle is 0°, the number of throwing waste is the most and the quantity of waste is 3340. Without surface strengthening, the wear resistance of the new throw-out plate is 0.614g -1. With surface strengthening, the wear resistant of the improved throw-out plate increases to 9.174g -1. The unimproved throw-out plate is about 1500 hours. Through the contrast experiment, wear time per unit thickness of the improved throw-out plate enhances 300 hours to 600 hours, which provide important guidance for structure design and process design.
IntroductionMilling efficiency and pavement effect are important indexes for the performance of milling machine. With the optimization design and material process improvement of rotor cutters, milling efficiency has been significantly improved, and the research of milling effect has also been significantly improved through the wear resistance improvement of sliding shoes and scrapers. To avoid the accumulation of waste particles in the milling room, the throw-out plate is designed on the milling drum and the waste of the rotor tool surface is thrown into the milling room. The waste particles that have not been thrown into the milling room will remain on the road, and are collected by the slipper and scraper, which cause resistance and impact to the slipper and scraper. Therefore, the quality of the throwing effect affects the pavement milling effect of the slipper and the scraper [1][2][3]. The improvement of the throw-out plate structure and the installation angle has a direct effect on the throwing waste effect.Many experts have done much research on the milling system design and the milling efficiency. According to the milling process and structure forms, Ma P. Y. et al. [4] established the mathematical model of motor drive system to analyze and discuss and the relationship between the load and the speed. Gao L. et al. [5] has designed different milling drum surface, milling speed and milling depth, which