J-shaped seamed edge correction auger bit

Abstract

The invention relates to a J-shaped seamed edge correction auger bit. A cutter body and a handle part are coaxial cylinders with one same central axis serving as a center, a spiral chip removal groove is formed in the cutter body in a ground mode, two rear cutter faces are formed at the end surface positions of the head of the cutter body in a ground mode, an intersection line of the rear cutter faces and the chip removal groove form a main cutting blade, the intersection line of the two rear cutter faces form a horizontal blade, a seamed edge is formed in the position, close to the chip removal groove, of the cutter body, an inner blade is formed between the main cutting blade and the horizontal blade in a ground mode, an intersection point of the main cutting blade and the seamed edge is a cutter point, and the seamed edge at the cutter pint is cleared so as to form a J-shaped seamed edge. The J-shaped seamed edge is designed, the seamed edge nearby the cutter point narrows, the drill resistance is reduced during drilling so that the bit has certain radial cutting competence, and the drilling accuracy of a workpiece surface is guaranteed in the direction not particular to in the drilling direction, which is particularly important for cast aluminum alloy. The J-shaped seamed edge correction auger bit is also very suitable for a pre-casting hole occasion, and when the manufacturing accuracy of the bit such as coaxiality and symmetry height is high and the strength is high enough, the drilling accuracy can be guaranteed by the aid of the cutting competence of the seamed edge.

Description

technical field [0001] The invention relates to a cutting tool for high-speed and high-efficiency metal cutting, in particular to a J-shaped edge-modified twist drill used for high-precision drilling of automobile casting aluminum alloys and new aluminum-lithium alloys. Background technique [0002] Drilling is an important process in metal cutting, but most of the drilling process belongs to preliminary processing. The surface quality, dimensional accuracy and position accuracy of the hole usually cannot meet the final requirements of the part, and subsequent hole expansion, boring or reaming is required. The hole is further refined. [0003] Because the processing of automotive cast aluminum alloys and new aluminum-lithium alloys not only requires high positional accuracy, but also must have special requirements for efficient processing capabilities. This requires corresponding improvements to the structure of the drill bit to improve the surface quality and drilling effi...

AI Technical Summary

Problems solved by technology

[0002] Drilling is an important process in metal cutting, but most of the drilling process belongs to preliminary processing. The surface quality, dimensional accuracy and position accuracy of the hole usually cannot meet the final requirements of the part, and subsequent hole expansion, boring or reaming is required. Hole further finishing

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