Poly blade hard metal drill

Abstract

The invention relates to a multi-edge solidness alloy drill, which belongs to the technical field of metal processing tool. The invention comprises a shank, a chamfer cutting edge arranged at the lower part of the shank, and a thread processing edge arranged at the lower part of the chamfer cutting edge, an aligning edge is arranged at the lower part of the thread processing edge, the chamfer cutting edge is of a spiral shape and can be extended and arranged at the lower part of the shank with equal-interval, and a first plow groove is formed between two adjacent chamfer cutting edges; the thread processing edge is of a spiral shape and can extend downward with equal-interval along a first bottom face of the chamfer cutting edge, a second plow groove connected with the first plow groove is formed between two adjacent chamfer cutting edges, the aligning edges are narrowed and extended serially to the center along the second bottom face of the thread processing edge and merged mutually in the center part, and a third plow groove connected with the second plow groove is formed between every two aligning edges. The invention has the advantages that the frequently drill changing during the processing of the hole shape can be avoided and the technical quality can be ensured; the invention is beneficial for the metal processing company to save the work fixture and the equipment cost; the processing efficiency can be improved above four times.

Description

technical field [0001] The invention belongs to the technical field of metal processing tools, and in particular relates to a multi-edged cemented carbide drill. Background technique [0002] As far as the current known materials and the technical level of using known materials to make drills, people agree that only drills made of high-hard alloy wear-resistant materials with tungsten carbide as the main component are effective means to control wear-resistant failure Therefore, ultra-fine particle cemented carbide drills are widely used in the field of metal processing because of their ideal strength, rigidity and high wear resistance. As Chinese Patent Authorization Announcement No. CN2808378Y summarizes in the background technology column, cemented carbide drills have four classes, namely solid carbide drills, cemented carbide indexable insert drills, welded carbide drills, and hard alloy drills. Replace the carbide crown bit. This patent also objectively reviews the adv...

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Problems solved by technology

[0003] But, make a general survey of existing patent documents and relevant professional periodicals, neither see nor hear the report or the drill bit product of the cemented carbide drill bit that can significantly shorten the processing time of the workpiece so far, for example when processing on the workpiece When a threaded hole is formed and there is a chamfered process hole or mounting hole at the hole, it is usually necessary to proceed step by step according to the process shown in Figure 2, and select the center drill 1a to drill the center hole 21a on the workpiece 2; Then implement the bottom hole processing, that is, use the bottom hole processing drill 1b to process the centering hole 21a into the bottom hole 21b (usually need to repeat twice); then do thread processing, use the thread drill 1c to process the bottom hole 21b into the threaded hole 21c; Finally, use the chamfer drill 1d to process the expanded chamfer hole 21d to the aperture of the threaded hole 21c

In terms of phenomenal (formal) defects, this processing method has cumbersome procedures and long processing time; in terms of substantive defects, there are at least the following aspects: one is that it needs to be equipped with a variety of drill bits with different structures, which is not only unfavorable for use management, and increase the configuration cost of the drill bit; secondly, due to the different drill bits, the corresponding fixtures are also different, so there are many fixtures; The amount is increased; the fourth is that due to frequent drill changes, the quality of the process hole or the workpiece hole cannot be guaranteed, and the accuracy error is often large, which cannot meet the high-precision processing requirements; The local (surface) cooling of the drill bit, so the processing speed is restricted, otherwise the service life of the drill bit will be seriously affected, or even scrapped

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