JP2021091061A - Skiving cutter - Google Patents

Abstract

To provide a skiving cutter making influence on tooth muscle accuracy of a workpiece minimum even when shake of the skiving cutter is generated at the time of skiving work.SOLUTION: A skiving cutter 10 having a plurality of cutting edges 11 on the outer peripheral surface is so constituted that the two or more cutting edges 11A, 11B adjacent each other are localized only one place. In that case, the number of the cutting edges 11 is in a range of two or more and 10 or less. The number of the cutting edges 11 of the skiving cutter 10 is determined from the greatest common divisor of the total number of teeth of a gear to be worked, and the number of cutting edges of a conventional skiving cutter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a skiving cutter that processes gears.

In recent years, a machining method in which a skiving cutter is attached to a machine tool by machining a gear on a work piece (workpiece) and the skiving cutter and the work are rotated together is becoming mainstream. is there. Gear cutting using a skiving cutter, so-called skiving, is performed while the skiving cutter is moved in the vertical direction while the rotation axis of the skiving cutter and the rotation axis of the work are kept at a predetermined angle. Therefore, the contact form between the cutting edge of the skiving cutter and the tooth surface of the work greatly affects the accuracy of the tooth muscle of the work.

In Patent Document 1, the cutting edges of a skiving cutter formed over the entire circumference in the circumferential direction are thinned out at regular intervals (two or more cutting edges are scattered over the entire circumference), and skiving during skiving processing is performed. It is disclosed that the tooth muscle accuracy of the work is improved by reducing the cutting load on the cutter.

JP-A-2015-33732

However, even if the cutting load on the skiving cutter is reduced by dispersing the cutting edges of the skiving cutter over the entire circumference, the skiving cutter will run out during skiving depending on the state in which the skiving cutter is attached to the machine tool. Vibration) occurs. When this vibration occurs during skiving processing, the rotation axis of the skiving cutter and the processing position of the work always change by a small amount, and as a result, the tooth muscle accuracy of the work is affected.

Therefore, it is an object of the present invention to provide a skiving cutter that minimizes the influence on the tooth muscle accuracy of the work even when the skiving cutter swings during skiving processing.

The skiving cutter of the present invention has a configuration in which two or more blades adjacent to each other are localized in only one place. The number of adjacent blades may be in the range of 2 or more and 10 or less.

In the skiving cutter of the present invention, two or more blades are locally arranged at only one place, so that there are a portion having a blade portion and a portion without a blade portion over the entire circumference of the skiving cutter. Therefore, in the machining by the skiving cutter of the present invention, the gear cutting process proceeds due to the intermittent contact between the blade portion and the work material. As a result, even if the skiving cutter swings during processing, the effect of minimizing the influence on the tooth muscle accuracy of the work material is achieved.

It is a schematic plan view of the skiving cutter 10 of this invention. It is explanatory drawing of the gear cutting process (first step) of this invention. It is explanatory drawing of the gear cutting process (second step) of this invention. It is explanatory drawing of the gear cutting process (third step) of this invention. It is explanatory drawing of the conventional gear cutting process.

An embodiment of the skiving cutter of the present invention will be described with reference to the drawings. A schematic plan view of the skiving cutter 10 according to an embodiment of the present invention is shown in FIG. The skiving cutter 10 is an embodiment in which six cutting edges 11 (11A to 11F) adjacent to each other are localized in one place. In the gear cutting process using the skiving cutter 10, it is assumed that the gear rotates in the direction of the arrow (counterclockwise) in the drawing.

The steps of gear cutting using the skiving cutter 10 (first to third steps) are shown in FIGS. 2 to 4. First, in the first step of gear cutting, the skiving cutter 10 having six cutting edges 11 (11A to 11F) rotates (first rotation) in the direction of the arrow shown in FIG. 2 (counterclockwise), and the gears. By rotating the 50 (material) in the direction of the arrow (clockwise), six grooves 51 (51A to 51F) are machined on the outer peripheral surface of the gear 50. As a result, five teeth 52 (52A to 52E) are machined on the gear 50.

Subsequently, the skiving cutter 10 rotates in the direction of the arrow (counterclockwise) shown in FIG. 3 (second rotation), and the gear 50 rotates in the direction of the arrow (clockwise), whereby the outer peripheral surface of the gear 50 Six grooves 51 (51G to 51L) are additionally machined. As a result, six teeth 52 (52F to 52K) are machined, so that the total number of teeth 52 machined on the outer peripheral surface of the gear 50 is 11 (52A to 52K).

Further, the skiving cutter 10 rotates in the direction of the arrow (counterclockwise) (third rotation), and the gear 50 rotates in the direction of the arrow (clockwise) as shown in FIG. As a result, seven teeth 52 (52L to 52R) are processed by additionally performing groove processing 51 (51M to 51R) at six locations. As a result, all grooving is completed, and a total of 18 teeth 52 (52A to 52R) are machined on the outer peripheral surface of the gear 50.

Next, a method (procedure for determining) of setting the number of cutting edges of the skiving cutter of the present invention will be described. FIG. 5 shows a plan view of the conventional skiving cutter 20 and the gear 60 machined using the conventional skiving cutter 20. The total number of teeth 61 (61A, 61B, 61C ...) Of the gear 60 to be machined is 18, and the cutting edge 21 (21A, 21B, 21C ...) Of the skiving cutter 20 for machining the gear 60. The number is assumed to be twelve.

When the gear 60 is gear-cut using the skiving cutter 20, it depends on the greatest common divisor "6" of the total number of teeth 61 of the gear 60 "18" and the total number of cutting edges 21 of the skiving cutter 50 "12". The cutting pattern is determined. In this case, the gear cutting process is performed by repeating three types of cutting patterns in which the total number "18" of the teeth 61 of the gear 60 is divided by the greatest common divisor "6" described above.

That is, it is necessary to process all 18 teeth of the gear 60 with these three types of cutting patterns. In other words, the number of cutting edges of the skiving cutter of the present invention is determined from the total number of gear teeth to be machined and the greatest common divisor of the number of cutting edges of the conventional skiving cutter. In this embodiment, an example of machining an external gear by a skiving cutter has been described, but the form (procedure for determining) of the cutting edge of the skiving cutter is the same when machining an internal gear.

10, 20 skiving cutter 11 cutting edge 50, 60 gear 52, 61 (gear) teeth

Claims (2)

A skiving cutter in which cutting edges are arranged in the circumferential direction on the outer peripheral side of a central portion of a columnar shape, and the skiving cutter is characterized in that two or more cutting edges are locally arranged. The skiving cutter according to claim 1, wherein the number of cutting edges is in the range of 2 or more and 10 or less.

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