JP2018153913A - Skiving cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skiving cutter capable of extending the length of life even when an overload is applied during gear cutting.SOLUTION: A skiving cutter 1 has a plurality of cutting edges 2 provided on a gear-type tooth flank. The plurality of cutting edges 2 structurally have a predetermined angle β of torsion with respect to a shaft center O of the skiving cutter 1. The cutting edge 2 structurally has a predetermined sharpening angle α with respect to a reference plane H orthogonal to the shaft center O. A difference (α-β) between the sharpening angle α and the angle β of torsion is set to be in the range of an angle larger than 2° and smaller than 15°. Additionally, the sharpening angle α is set to be in a range from 5° to 40°.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a skiving cutter which is a gear cutting tool for machining a gear.

  Conventionally, there are pinion cutters shown in Patent Document 1 and Patent Document 2 as tools (gear cutting tools) for processing gears on an inner peripheral surface and an outer peripheral surface of a workpiece. The pinion cutter is a tool that processes gears on the inner peripheral surface and the outer peripheral surface of the workpiece while rotating in synchronization with the workpiece and rotating the workpiece.

  In recent years, there is a skiving cutter as a tool having the same action and the same form. Gear machining using a skiving cutter uses the principle of sliding motion generated between the work piece and the skiving cutter by intersecting the central axis of the work piece with the central axis of the skiving cutter. Yes.

JP-A-2-269522 Japanese Utility Model Publication No. 58-113421

  However, in gear processing using skiving cutters, the effective rake angle is negative, so an excessive load is applied to the edge of the cutting edge (tip), and tool life is shortened compared to gear processing using pinion cutters. There was a problem.

  Accordingly, an object of the present invention is to provide a skiving cutter that can reduce an excessive load and improve the service life during gear processing.

In order to solve the aforementioned problems, the present invention provides a skiving cutter having a plurality of cutting edges on a gear-type tooth surface, wherein the plurality of cutting edges have a predetermined twist angle with respect to the axis of the skiving cutter. The cutting edge has a predetermined cutting angle with respect to a reference plane orthogonal to the axis. Further, the cutting angle α is set in the range of 5 ° to 40 °.

At this time, when the blade angle is larger than the twist angle, the difference between the blade angle and the twist angle is set to a range larger than 2 ° and smaller than 15 °. Further, the cutting angle can be the cutting angle at the trailing edge of the skiving cutter.

By using the skiving cutter of the present invention, the load on the cutting edge during gear machining can be reduced. As a result, the service life can be improved even when an excessive load is applied during gear machining.

1 is a cutaway view of a skiving cutter 1 showing an embodiment of the present invention. It is a schematic plan view which shows the processing form of skiving cutter T1 and internal gear component W1. FIG. 3 is an enlarged view of a portion X1 shown in FIG. 2. FIG. 3 is a P1 arrow view shown in FIG. 2. It is a schematic plan view which shows the processing form of skiving cutter T2 and internal gear component W2. It is an enlarged view of the X2 part shown in FIG. It is a P2 arrow line view shown in FIG. It is a schematic plan view which shows the processing form of skiving cutter T3 and external gear component W3. It is an enlarged view of the X3 part shown in FIG. It is a P3 arrow line view shown in FIG. It is a schematic plan view which shows the processing form of skiving cutter T4 and external gear component W4. It is an enlarged view of the X4 part shown in FIG. It is a P4 arrow line view shown in FIG.

The form of the skiving cutter of this invention is demonstrated using drawing. A cutaway view of a skiving cutter 1 showing an embodiment of the present invention is shown in FIG. The skiving cutter 1 of the present invention includes a plurality of cutting edges 2 on a gear-type tooth surface as shown in FIG. The plurality of cutting edges 2, 2 are evenly arranged on the circumference around the axis O of the skiving cutter 1. The tip portions of the cutting edges 2 and 2 have a cutting angle α with respect to a reference plane H orthogonal to the axis O. Further, the plurality of cutting edges 2 and 2 have a predetermined twist angle β with respect to the axis O of the skiving cutter 1. The cutting angle 2 of the cutting edge 2 is in the range of 5 ° to 40 °, and the difference (α−β) between the cutting angle α and the torsion angle β is larger than 2 ° and smaller than 15 °. To do.

Here, the “blade angle” of the cutting edge 2 is synonymous with the “blade angle” defined in JIS B0174, and “the angle (degree) of the rake face of the helical pinion cutter with respect to the axis perpendicular to the axis. ". The cutting angle α is preferably a cutting angle at which the blade angle (the angle formed by the rake face and the flank face of the cutting edge) in the trailing-side cutting edge 2 is an acute angle.

Further, in this application, when performing gear processing using a skiving cutter, the leading cutting edge side when the skiving cutter rotates is referred to as “leading cutting edge”, and the subsequent cutting edge side is referred to as “trailing-side cutting edge”. They are distinguished as “cutting blades”.

  Further, by setting the difference (α−β) between the cutting angle α and the torsion angle β to a range larger than 2 ° and smaller than 15 °, cutting with respect to a work material (especially the cutting side) in gear machining. Performance can be improved. As a result, it is possible to reduce an excessive load during cutting of the work material during gear machining and to improve the life of the skiving cutter.

  Next, the processing mode of gear parts using the skiving cutter of the present invention will be described. Forms for processing gear parts can be broadly classified into processing of internal gears on the inner peripheral side of processed parts and processing of external gears on the outer peripheral side of processed parts. Processing forms in the case of processing an internal gear using the skiving cutter of the present invention are shown in FIGS. Further, machining forms when machining an external gear using the skiving cutter of the present invention are shown in FIGS.

FIG. 2 is a schematic diagram (plan view) showing a machining mode when both the skiving cutter T1 and the internal gear part W1 are machined counterclockwise, FIG. 3 is an enlarged view of a portion X1 shown in FIG. 2, and FIG. The P1 arrow line view (schematic diagram) shown in FIG. 2 is shown. 2 and 4, the skiving cutter T1 rotates counterclockwise around the axis C1, and the internal gear part W1 rotates while rotating counterclockwise around the axis C2. Processing. At that time, the side where the skiving cutter T1 (the cutting edge) and the internal gear part W1 (the teeth) shown in FIG. 3 are in contact with each other is the leading side (left side with respect to the center line of the cutting edge on the paper surface), The opposite side is called the trailing side (the right side of the center line of the cutting edge on the paper).

FIG. 5 is a schematic diagram (plan view) showing a machining mode when both the skiving cutter T2 and the internal gear part W2 are machined clockwise, and FIG. 6 is a partially enlarged view of a portion X2 shown in FIG. 7 shows a P2 arrow view shown in FIG. 5 and FIG. 7, the skiving cutter T2 rotates clockwise around the axis C1, and the internal gear part W2 performs gear machining while rotating clockwise around the axis C2. Do. At that time, the side where the skiving cutter T2 (the cutting edge) and the internal gear part W2 (the teeth) shown in FIG. 6 are in contact with each other is the leading side (on the right side of the center line of the cutting edge on the paper surface), The opposite side is called the trailing side (left side with respect to the center line of the cutting edge on the paper surface).

Next, FIG. 8 is a schematic diagram (plan view) showing a machining mode when the skiving cutter T3 gears the external gear part W3, FIG. 9 is a partially enlarged view of a portion X3 shown in FIG. 8, and FIG. P3 arrow view shown in FIG. 8 and 10, the skiving cutter T3 rotates counterclockwise around the axis C1, and the external gear part W3 rotates while rotating clockwise around the axis C2. I do. At that time, the side where the skiving cutter T3 (the cutting edge) and the external gear part W3 (the teeth) shown in FIG. 9 are in contact with each other is the leading side (left side with respect to the center line of the cutting edge on the paper surface), The opposite side is the trailing side (on the right side of the center line of the cutting edge on the paper).

11 is a schematic diagram (plan view) showing a machining mode when the skiving cutter T4 gears the external gear part W4, FIG. 12 is a partially enlarged view of a portion X4 shown in FIG. 11, and FIG. P4 arrow view shown in FIG. 11 and 13, the skiving cutter T4 rotates clockwise around the axis C1, and the external gear part W4 rotates gearwise while rotating counterclockwise around the axis C2. I do. At that time, the side where the skiving cutter T4 (the cutting edge) and the external gear component W4 (the teeth) shown in FIG. 12 are in contact with each other is the leading side (on the right side of the center line of the cutting edge on the paper) The opposite side is the trailing side (on the left side of the center line of the cutting edge on the paper).

1, T1 to T4 Skiving cutter 2 Cutting edge O, C1 Skiving cutter axis H Reference plane perpendicular to skiving cutter axis α Cutting edge angle β Cutting edge twist angle

Claims (3)

A skiving cutter having a plurality of cutting edges on a gear-type tooth surface, wherein the plurality of cutting edges have a predetermined twist angle with respect to an axis of the skiving cutter, It has a predetermined cutting angle with respect to a reference plane orthogonal to the axis, and the difference between the cutting angle and the twist angle is in a range larger than 2 ° and smaller than 15 °. Skiving cutter to do. The skiving cutter according to claim 1, wherein the blade angle is in a range of 5 ° to 40 °. The skiving cutter according to claim 2, wherein the cutting angle is a trailing angle of the cutting edge on the trailing side.

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