JP2022026483A - Skiving cutter - Google Patents

Abstract

To provide a skiving cutter which can preferably prevent clogging of chips in a tooth groove to achieve high working accuracy.SOLUTION: A typical structure of a skiving cutter according to the invention for achieving the above object is a skiving cutter 100 in which a shank 120 and a cutting blade 140 are integrated. A coolant groove 122 which supplies a coolant to the cutting blade 140 is formed from a rear end of the shank 120 to the front end on an outer peripheral surface of the shank 120.SELECTED DRAWING: Figure 2

Description

The present invention relates to a skiving cutter in which a shank and a cutting edge are integrated.

Skiving processing is known as a processing method for creating internal gears and the like. The skiving process is performed by tilting the rotation axis of the tool with respect to the rotation axis of the work while synchronizing the rotation of the work piece with the rotation of the tool. This causes a difference between the rotation direction of the workpiece and the rotation direction of the tool, and "slip" occurs when the tool interferes with the workpiece. This slip is used to scrape off the interference part from the work piece and machine the tooth groove etc. on the work piece. In recent years, such skiving processing has been implemented as a function of a multi-tasking machine along with other turning processing and drilling processing.

The skiving process is performed by supplying a coolant (mainly oil-based cutting oil and water-soluble cutting agent) for cooling, lubrication, rust prevention, and chip removal, as in the case of normal cutting. Conventionally, these fluids may be supplied from a nozzle of an external device, but in recent years, a structure for directly supplying the fluid to a processing machine has also been disclosed. For example, in the cutting tool with a replaceable cutting edge of Patent Document 1, a groove extending in the direction of the center line of the screw is formed in the shaft portion of the clamp screw. The groove portion communicates with the coolant discharge groove portion formed on the tip surface of the cutting edge.

Japanese Unexamined Patent Publication No. 2015-168024

According to Patent Document 1, it is possible to supply the coolant even if the cutting insert (cutting edge) is fixed by the clamp screw according to the above-mentioned configuration. However, in the structure disclosed in Patent Document 1, the coolant is supplied along the pressed surface (tip surface of the cutting edge). Then, it is considered that the coolant reaches the cutting edge, which is the edge of the tip surface, but it is difficult for the coolant to reach the tooth groove on the side surface of the cutting edge. For this reason, there is a possibility that the chips of the workpiece are likely to be clogged in the tooth groove.

In view of such a problem, the present invention can suitably prevent clogging of chips in the tooth groove, and obtain high machining accuracy for removing chips having a blind hole shape, which has been conventionally used by shaper processing. The purpose is to provide a skiving cutter capable of.

A typical configuration of the skiving cutter according to the present invention for solving the above problems is a skiving cutter in which a shank and a cutting edge are integrated, and the outer peripheral surface of the shank has a shank from the rear end to the front end. It is characterized in that a coolant groove for supplying the coolant toward the cutting edge is formed.

According to the above configuration, since the coolant removes chips from both the tooth groove and the cutting edge, it is possible to suitably prevent the chip from clogging the tooth groove. Therefore, it is possible to prevent the work surface from being scratched by chips and to prevent the cutting position from being displaced, and to obtain high work accuracy even when machining a blind hole shape.

The tip of the coolant groove may be inclined in the radial direction toward the cutting edge of the cutting edge. The radial direction is the radial direction of the cross-sectional circle where the skiving cutter has a generally round bar shape. According to such a configuration, the coolant can be efficiently supplied toward the cutting edge of the cutting edge. Therefore, it is possible to enhance the above-mentioned effect.

The tip of the coolant groove may be inclined in the circumferential direction in the same direction as the tooth groove of the cutting edge. The circumferential direction is the tangential direction of the cross-sectional circle where the skiving cutter has a generally round bar shape. According to such a configuration, the coolant can be efficiently supplied to the tooth groove of the cutting edge. Therefore, it is possible to enhance the above-mentioned effect.

According to the present invention, it is possible to provide a skiving cutter capable of suitably preventing clogging of chips in the tooth groove and obtaining high machining accuracy.

It is a figure explaining the skiving cutter which concerns on 1st Embodiment. It is a figure explaining the skiving cutter. It is sectional drawing which shows the state which attached the skiving cutter to a holder. It is a figure explaining the skiving cutter which concerns on 2nd Embodiment. It is a figure explaining the skiving cutter which concerns on 3rd Embodiment.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present invention are illustrated or described. Is omitted.

(First Embodiment)
FIG. 1 is a diagram illustrating the skiving cutter 100 according to the first embodiment. FIG. 1A is a front view of the skiving cutter 100, the holder 110, and the work 102, and FIG. 1B is a bottom view showing only the work 102 and the cutting edge 140.

The skiving cutter 100 shown in FIGS. 1 (a) and 1 (b) is a cutting tool that performs skiving processing on a workpiece (work 102) while rotating. The work 102 is processed while rotating in synchronization with the skiving cutter 100. The processing machine that rotates the holder 110 and the work 102 is not shown. The cutter of the present invention can be used in all processing machines having an internal coolant mechanism (a mechanism in which coolant is supplied from the processing machine) without changing the processing machine.

The skiving cutter 100 holds the shank 120 in the holder 110 via the collet 130 (see FIG. 3). The rotation axis of the holder 110 intersects the rotation axis of the work 102 at a predetermined intersection angle θ. The cutting edge 142 of the cutting edge 140 of the skiving cutter 100 starts to enter the work 102 from the right side in the drawing and exits from the left side in the drawing. Then, the cutting edge 142 advances in the cutting direction relative to the work 102, and the work is gradually scooped out. Then, by feeding the skiving cutter 100 in the work axis direction while rotating synchronously, cutting is performed over the entire length of the work 102.

FIG. 2 is a diagram illustrating the skiving cutter 100. FIG. 2A is an external view, and FIG. 2B is a sectional view. As shown in FIG. 2A, the skiving cutter 100 is integrally provided with a cutting edge 140 at the tip of the shank 120. The cutting edge 140 has a truncated cone shape with a wide tip (lower side in the drawing), a cutting edge 142 is formed on the edge of the tip, and a tooth groove 144 is formed on a side surface. The tooth groove 144 is inclined according to the intersection angle θ between the skiving cutter 100 and the work 102.

A coolant groove 122 that supplies coolant toward the cutting edge 140 is formed on the outer peripheral surface of the shank 120 from the rear end 120a to the front end 120b of the shank 120. That is, the coolant groove 122 is formed over the entire length of the shank. In this embodiment, three coolant grooves 122 are formed evenly in the circumferential direction.

FIG. 3 is a cross-sectional view showing a state in which the skiving cutter 100 is attached to the holder 110. As shown in the side sectional view of FIG. 3A, a coolant hole 112 is formed inside the holder 110. The coolant hole 112 communicates with the coolant groove 122 of the shank 120. Then, as shown in the cross-sectional view taken along the line AA of FIG. 3B, the tip of the coolant groove 122 opens toward the cutting edge 140.

Coolant is supplied to the coolant hole 112 from a processing machine (not shown). The coolant is then ejected from the front surface of the shank 120 through the coolant groove 122 of the shank 120 (strictly speaking, through the gap between the coolant groove 122 and the collet 130) and supplied toward the cutting edge 140.

According to the above configuration, the coolant can be efficiently supplied to the cutting edge 140. In particular, the coolant is supplied to the cutting edge 142 through the tooth groove 144. As a result, the coolant removes chips from the tooth groove 144, so that clogging of the chips can be suitably prevented. Therefore, it is possible to prevent scratches on the work surface due to chips and deviation of the cutting position, and to obtain high work accuracy.

Further, the cutter of the present invention can suitably prevent chip clogging of blind holes. Therefore, it is also effective for removing chips having a blind hole shape, which has been conventionally used for shaper processing, and it becomes possible to replace shaper processing with skiving processing.

In particular, since a coolant groove is formed in the shank in a shank type cutter (a cutter in which a shank and a cutting edge are integrated), the optimum coolant injection direction can be obtained simply by attaching the skiving cutter 100 to a processing machine. Yes (no adjustment required). At this time, by setting the direction in consideration of the amount of re-polishing, the optimum injection direction can be obtained even after the re-polishing of the cutter.

(Second Embodiment)
FIG. 4 is a diagram illustrating the skiving cutter 100 according to the second embodiment. The same reference numerals are given to the parts where the description overlaps with that of the first embodiment, and the description thereof will be omitted.

The skiving cutter 100 is provided with a plurality of types having different diameters of the cutting edge 140. Therefore, when the diameter of the cutting edge 140 is large, the coolant may not reach the tooth groove 144 or the cutting edge 142 even if the coolant is injected straight from the shank 120.

Therefore, in the second embodiment shown in FIG. 4, an inclined surface 122b that is inclined in the radial direction (rising angle α) toward the cutting edge 142 of the cutting edge 140 is formed at the tip of the coolant groove 122. This makes it possible to more efficiently and reliably supply the coolant toward the tooth groove 144 and the cutting edge 142.

(Third Embodiment)
FIG. 5 is a diagram illustrating a skiving cutter according to a third embodiment. As shown in FIG. 5, in the skiving cutter 100 of the third embodiment, the inclined surface 122c at the tip of the coolant groove 122 is inclined in the circumferential direction (twist angle β) in the same direction as the tooth groove 144 of the cutting edge 140. Is forming. Thereby, the coolant can be more efficiently and surely supplied to the tooth groove 144. Therefore, it is possible to enhance the above-mentioned effect.

In the above embodiment, the number of coolant grooves 122 has been described as three, but the number of coolant grooves 122 may be increased or decreased as appropriate. Further, although the radial inclination (second embodiment) and the circumferential inclination (third embodiment) have been described, they may be inclined in both the radial direction and the circumferential direction. In this way, by forming the coolant groove in the shank of the shank type cutter, various injection directions can be set.

The present invention can be used as a skiving cutter.

100 ... skiving cutter, 102 ... work, 110 ... holder, 112 ... coolant hole, 120 ... shank, 122 ... coolant groove, 122b ... tip, 122c ... inclined surface, 130 ... collet, 140 ... cutting edge, 142 ... cutting edge, 144 ... tooth groove

Claims (3)

A skiving cutter with an integrated shank and cutting edge.
A skiving cutter characterized in that a coolant groove for supplying coolant toward the cutting edge is formed on the outer peripheral surface of the shank from the rear end to the front end of the shank. The skiving cutter according to claim 1, wherein the tip of the coolant groove is inclined in a radial direction toward the cutting edge of the cutting edge. The skiving cutter according to claim 1, wherein the tip of the coolant groove is inclined in the circumferential direction in the same direction as the tooth groove of the cutting edge.

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