Abstract: Double-metal wedge hob was developed by analyzing invalidation cause of wedge hob in shaft borer for mine and improving molten technique of hob shell.Machining cost of hob shell was reduced without decreasing its wear quality.In addition,improvement design of current hob pressurization structure met pressurization requirement of 8~10MPa in deep mine drilling.New-style pressurization structure and molten technique prolonged hob’s service life and provided wider space for development and application of shaft drilling method.