Rotation cutting tool

Abstract

The invention provides a rotary cutting tool which can realize the remarkable improvement of chip removal performance with excellent practicability. The rotary cutting tool forms a plurality of helical chip removal groove (2) from the front end of the tool at the periphery of a tool body (1). A peripheral blade (3) is formed at the front side of the chip removal groove (2) and the periphery of the tool body or the crossing profile part of the periphery of the tool body. Besides, a plurality of chip breakers (4) are arranged in parallel along the predicted helix rotating direction. The chip breaker (4) is arranged at the peripheral blade (3) concavely which can cut chip. In the rotary cutting tool, the chip breaker (4) is arranged in parallel along the helix rotary direction which guides from the chip removal groove (2) through the chip breaker (4) to the same direction of the chip removal direction with the moving cutting chip direction of the chip removal groove (2) adjacent to the back side of the tool rotary direction.

Description

technical field [0001] The present invention relates to rotary cutting tools. Background technique [0002] As a rotary cutting tool such as a router used in the contour processing of a printed circuit board, or an end mill used in the processing of metal materials, for example, as disclosed in Patent Document 1, there is A rotary cutting tool as follows: On the outer periphery of the tool body 21, a plurality of helical chip flutes 22 are formed from the front end of the tool toward the base end, and between the rake surface of the chip flutes 22 and the outer periphery of the tool body 21 A peripheral cutting edge 23 is formed on the intersecting ridgeline portion of the surface, and a plurality of chip breakers (Chipbreaker) 24 are arranged side by side along the predetermined helical rotation direction. refer to figure 1 ). In addition, in the figure, reference numeral 25 is an end cutting edge, α' is an angle indicating the helical rotation direction of the periphera...

AI Technical Summary

Problems solved by technology

[0007] Therefore, part of the upward chip removal performance by the chip removal flute 22 is canceled by the chips guided downward through the chip breaker 24 , and chip clogging is likely to occur.

When cutting clogging occurs, it leads to an increase in cutting resistance due to chip welding to the workpiece or the rake surface of the tool, and an increase in cutting temperature due to a decrease in heat dissipation, resulting in premature breakage of the tool

[0008] That is, in the conventional rotary cutting tool disclosed in Patent Document 1, although a chip breaker capable of breaking chips is provided, it is not yet possible to realize a remarkable increase in life as expected.

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