Centering spiral tool with combined positioning and combined cutting functions

Abstract

The invention provides a centering spiral tool with combined positioning and combined cutting functions, and mainly relates to a metal-plate spiral drill. The tool is high in stability and cooling efficiency and long in service life, and comprises a tool bit. The tool is characterized in that on spiral cutting faces facing the rotation direction, at least one level of various inner oblique cutting faces or combined spiral cutting faces , at the bottom or on the lateral sides, are formed through triangular-groove-shaped, trapezoid-groove-shaped, arc-triangular-groove-shaped or arc-trapezoid-groove-shaped recesses or through arc protrusions or oblique protrusions, and an included angle larger than 90 degrees but smaller than 180 degrees is formed between each spiral cutting face and the corresponding inner oblique cutting face or combined spiral cutting face; or, the arc protrusions or oblique protrusions vertically extend to form combined positioning and decomposing platforms intersecting with the combined spiral cutting faces on the inner side, and various inner oblique blades, side recessed blades or side oblique blades are formed to enable the stress to incline towards the inner side during cutting, so that the arm of force is reduced and cutting resistance of the outer side is decomposed, cutting efficiency and service life of the tool reach the maximum values, cost is reduced, and resources are saved.

Description

Technical field: [0001] The invention relates to a centering helical cutter for compound positioning and compound cutting, which is used in drilling machine processing and fitter maintenance. Background technique: [0002] At present, the twist drill used in mechanical processing is composed of a chisel edge, a cutting edge, a spiral secondary edge, and a side edge. The cutting edge and the secondary edge generally have a single structure, and the centering structure is poor. The method of setting a composite helical surface on the helical surface Because the included angle with the original helical surface is less than or equal to 120°, there is a part protruding to the outside of the helical surface, which is easy to break. These twist drills are extremely undurable, especially when drilling and milling workpieces with high hardness, a large amount of Heat will reduce the hardness of the cutter head and cause the wear of the cutter head. At the same time, the cutter head a...

AI Technical Summary

Problems solved by technology

[0002] At present, the twist drill used in mechanical processing is composed of a chisel edge, a cutting edge, a spiral secondary edge, and a side edge. The cutting edge and the secondary edge generally have a single structure, and the centering structure is poor. The method of setting a composite helical surface on the helical surface Because the included angle with the original helical surface is less than or equal to 120°, there is a part protruding to the outside of the helical surface, which is easy to break. These twist drills are extremely undurable, especially when drilling and milling workpieces with high hardness, a large amount of Heat will reduce the hardness of the cutter head and cause the wear of the cutter head. At the same time, the cutter head also has the defect of being easy to break. Moreover, since the cutting edges on both sides of the cutter head are symmetrical during work, the cutting amount is generally only tens of Micron to about 1 mm, so it is difficult to grasp the angle and height during manual grinding. In addition, the precision of these twist drills and the processed holes is unqualified, and waste products are very easy to appear. At the same time, there are still problems when processing thinner workpieces. Carrying the workpiece up to cause work-related accidents

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