Drill bit for machining threaded holes

Abstract

The invention belongs to the technical field of machine manufacturing devices, and particularly relates to a drill bit for machining threaded holes. The drill bit comprises a mounting machine, a drillrod, a fine drill bit and screw mechanisms, wherein the drill rod is rotationally mounted at the front end of the mounting machine, the outer wall of the drill rod is in a threaded shape, the fine drill bit is mounted in the lower end of the drill rod in an up-down sliding mode, the screw mechanisms are arranged in the drill rod and comprise mounting holes, protection plates, rubber film, threaded drills, elastic frames and extrusion rings, the mounting holes are uniformly formed in the threaded wall of the drill rod, and the protection plates are hinged in the mounting holes, are in an arc shape, and can be mutually closed to form a conical shape. The invention is mainly used for designing the novel drill bit, threads can be machined in the drilling process through the unique working mode of the drill bit, integrated operation is achieved, and the machining efficiency of the threaded holes is greatly improved; and meanwhile, the drill bit can automatically reset when the drill bit isnot running, so that the self-protection function is achieved.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing devices, in particular to a threaded hole drill. Background technique [0002] Thread refers to a helical continuous convex part with a specific cross section made on the surface of a cylindrical or conical parent body. The thread is divided into cylindrical thread and conical thread according to the shape of its parent body; it is divided into external thread and internal thread according to its position in the parent body, and it is divided into triangular thread, rectangular thread, trapezoidal thread and zigzag thread according to its cross-sectional shape (tooth shape). And other special shape threads. [0003] Processing threaded holes must go through two processes. First, use a drill to process a low hole smaller than the diameter of the threaded hole, and then use a tap to process a thread on the surface of the bottom hole. This method is inefficient. Since the advent of ...

AI Technical Summary

Problems solved by technology

[0003] Processing threaded holes must go through two processes. First, use a drill to process a low hole smaller than the diameter of the threaded hole, and then use a tap to process a thread on the surface of the bottom hole. This method is inefficient. Since the advent of CNC machine tools, the efficiency of thread processing It has been greatly improved, but the threaded hole is processed by two steps, that is, drilling first and then changing the tool to tap.

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