Split type drilling tool

Abstract

The invention discloses a split type drilling tool which comprises a replaceable head module and a drill rod body; a drill bit is arranged at the center of one end of the replaceable head module, matched cornish bits are arranged at the two sides of the replaceable head module, and two first positioning columns are arranged oppositely at the other end of the replaceable head module; the drill rod body is matched with the replaceable head module and provided with first limiting grooves for the first positioning columns to extend into, wherein each first positioning column is configured to be of a fan-shaped or multi-petal convex arc structure in space; a plurality of sections of tangent arc-shaped surfaces in clearance fit are arranged at the side, matched with the side wall of the corresponding first limiting groove, of each first positioning column; a conical drill tip of the drill bit is distributed in an S shape in space, and a chisel edge is arranged at the top; and the chisel edge forms a flat cutting edge of 1-2 mm at the top end of the drill tip. The split type drilling tool has the advantages of being higher in interchangeability, better in centering effect and more excellent in cost advantage, the forming degree of drilling cuttings is better in the drilling process of the drill tip, the machining precision of drilled holes is better, and the service life is longer.

Description

technical field [0001] The invention relates to a drilling tool for machining. More specifically, the present invention relates to a split drill. Background technique [0002] Drilling tools refer to tools related to drilling and drilling, and usually include a matching drill body and a cutting edge. The cutting edge is mounted on the drill body by matching screws or welding. In the actual production and use process, the size of the drill body required for each diameter and depth of the hole is also ever-changing, so there are many varieties and specifications that customers need to stock up, and the overall use cost is relatively high. In the processing process, the loss of the drill body is divided into normal loss and abnormal loss: 1. The long-term friction of waste generated during the drilling process will cause damage to the drill body (normal loss); 2. Edge failure or other If the abnormality is not found, it will cause irreversible and sudden damage to the drill b...

AI Technical Summary

Problems solved by technology

In the processing process, the loss of the drill body is divided into normal loss and abnormal loss: 1. The long-term friction of waste generated during the drilling process will cause damage to the drill body (normal loss); 2. Edge failure or other If the abnormality is not found, it will cause irreversible and sudden damage to the drill body (abnormal loss). Therefore, the loss cost of the drill body during use is also high; In this case, this will cause the entire rod to be scrapped, and the finished product will be high

[0003] In addition, the existing drill bit usually plays the role of drilling in the drilling process, so its drill point is in a conical structure in space to play the effect of drilling, but the drill point in the prior art is all a pointed The structure, and then extended to both sides, the drilling effect is excellent, but it is not conducive to the helical formation of iron filings during the drilling process, and the drill bit shakes greatly during the drilling process, which affects its service life and drilling accuracy

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