Structural style and process analysis of different tools for road-surface milling-planing

Several most commonly used tools for road-surface milling-planing are introduced,and their structural difference and characteristics are analyzed to improve the quality of tools.The material composition,structure and property,brazing material and joint strength between tool head and tool body are studied by optical microscope(OM),scanning electron microscope(SEM),energy depressive spectroscopy(EDS) and microhardness tester,etc.Based on experimental results,some recommendations are presented as follows:the tool with flat-bottomed and v-grooved welding structure is suited for milling-planing;the cemented carbide that the content of Cobalt is less than eight percent used as tool head material will give good results;the alloy steels,such as 5CrMnMo with high tempering temperature and tempering martensite,is selected as tool body;the tool head and tool body are jointed with Ni and Cr containing solder and high frequency induction heating brazing.