Conjoined cross drill bit for drilling blast furnace molten iron outlet and production method of conjoined cross drill bit

Abstract

The invention discloses a conjoined cross drill bit for a drilling blast furnace molten iron outlet and a production method of the conjoined cross drill bit. A die bowl (6) is internally provided witha produced sand core (7), wherein a carbide bit (8) is putted on the sand core (7); the carbide bit (8), a longitudinal bit matrix and a transverse bit matrix form a cross drill bit top (1); after adrill bit matrix (5) is arranged on the sand core (7) and fixed, a gap between the drill bit matrix (5) and the sand core (7) is filled with an alloy powder; the die bowl (6) is equipped with an upperdie sleeve (9); the upper die sleeve (9) is filled with alloy particles; the whole body is putted into a sintering furnace, is electrified, heated to 1100 to 1200 DEG C and insulated for 6 to 8 hours; after power failure and cooling, the upper die sleeve (9) is opened. The carbide bit (8), melted alloy particles and alloy powder are subjected to sintering infiltration to obtain the drill bit top(1) which is sintered, bonded and fixed with a drill bit handle part (4) to form a whole body. The cross drill bit disclosed by the invention has the advantages of high strength, good safety, suitability for drilling the blast furnace molten iron outlet, long life, low cost, high production efficiency and good economic benefits.

Description

technical field [0001] The invention relates to a drill bit for industrial drilling, in particular to a drill bit for drilling holes in a tapping nozzle of a smelting blast furnace. Background technique [0002] At present, domestic drill bits used for smelting blast furnace iron nozzle holes are generally processed into drill shanks by turning round steel materials, and then welded with alloy blades at the front end crown to make drill bits. Although the drill bit of this structure can complete the drilling task of the general blast furnace iron nozzle, the structure of the welding of the cutter head and the drill bit crown of the traditional welded drill bit, and the welding of the drill bit crown and the drill bit shank, will be damaged under high temperature conditions. Deformation occurs, wear resistance and impact resistance are poor. After drilling into 3-4 blast furnace tapping nozzles, the drill bit must be replaced to increase the operating intensity, which is time...

AI Technical Summary

Problems solved by technology

Although the drill bit of this structure can complete the drilling task of the general blast furnace iron nozzle, the structure of the welding of the cutter head and the drill bit crown of the traditional welded drill bit, and the welding of the drill bit crown and the drill bit shank, will be damaged under high temperature conditions. Deformation occurs, wear resistance and impact resistance are poor. After drilling into 3-4 blast furnace tapping nozzles, the drill bit must be replaced to increase the operating intensity, which is time-consuming and laborious. There are unsafe factors, high operating costs, and short service life. Low production efficiency

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