Abstract:
Cutting picks are the most damaged part in coal mining, and its failure leads to the interruption of the whole mining work.A model of imported and domestic picks were selected as research objects, and the microstructure and chemical composition of cladding layer, tooth body, brazing layer and cemented carbide of the picks were analyzed by SEM and EDS.Subsequently, three-body abrasive wear and dynamic load impact abrasive wear conditions were selected to analyze the three-body and impact abrasive wear behavior of cladding layer.The results show that the properties of cladding layer are closely related to the content and size of WC reinforcing phase.High content and large size WC not only improve the hardness of cladding layer on the picks, but also improve the low impact wear resistance of the picks, with the wear resistance increased by 63.28%.In addition, improving the shear resistance of the brazing layer on the picks reduces the problems of tooth removal and tooth loss of the picks.Therefore, it is necessary to comprehensively improve the performance of the picks from the bits, brazing layers, cladding layers and body parts, so as to achieve the comprehensive improvement of the performance of the picks.