Mountain cutting tool useful as chisels and drill bits for mining extraction machines, comprises carbide cutting inserts, where the tool is produced by casting in a casting mold with the target of increasing the wear resistance

摘要

The mountain cutting tool comprises carbide cutting inserts, where the tool is produced by casting in a casting mold with the target of increasing the wear resistance and the reliability of fastening of the carbide cutting inserts in a metal body of the tool, eliminating its soldering, pressing and adhering steps and exact processing of the openings for it. The carbide cutting inserts are preliminarily inserted into the casting mold and the tool fixes with the metal caskets for the drill bits. The casting temperature of the metal passes over the melting temperature in minimum to 50-60[deg] C. The mountain cutting tool comprises carbide cutting inserts, where the tool is produced by casting in a casting mold with the target of increasing the wear resistance and the reliability of fastening of the carbide cutting inserts in a metal body of the tool, eliminating its soldering, pressing and adhering steps and exact processing of the openings for it. The carbide cutting inserts are preliminarily inserted into the casting mold and the tool fixes with the metal caskets for the drill bits. The casting temperature of the metal passes over the melting temperature in minimum to 50-60[deg] C with the target of obtaining reliable and durable contact between the carbide cutting insert and the body of the drill bit and exception of the defects in the course of casting process. For providing safe fastening of the carbide cutting insert in the body of the tool, a tail part of the tool is fulfilled in the form of cylindrical conical taper angle of 4-5[deg] or versatile, where the front surface of the tail part has the carbide cutting inserts in the form of ball (3), bulb or recess (4) and has mushroom-like shape of the work surface. For increasing the wear resistance of the tool at the working surface, a conical protective shield (1) made of wear-resistant material is installed and is displayed together with the carbide cutting insert in the casting mold before its filling with liquid metal. For improving the fastening in the body of the tool, the protective shield is fed as dovetail in section with the ribs (2) or concentric annular protrusions having the groove between the protrusions. After the periphery of the working surface of the protective shield, the flowing rounding is fulfilled to connect it with the side surface of a working head of the drill bit, which has cone-shape or parabolic shape according to the hardness of the destroyed material types.