Tool and a cutting insert for power skiving

Patent metadata

Field	Value
Publication number	US-9981330-B2
Application number	US-201414468377-A
Country	US
Kind code	B2
Filing date	Aug 26, 2014
Priority date	Aug 27, 2013
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A power skiving tool includes a basic body, which is equipped with a plurality of replaceable cutting inserts, by means of which chips can be carved or peeled out of a workpiece with the purpose of forming, for instance, teeth. The individual cutting insert is formed with only one cutting edge) and has a rear end in the form of a shoulder surface, against which an adjusting mechanism is pressed for the fine adjustment of the radial position of the cutting insert in relation to the basic body. On the underside of the cutting insert, there is in addition a control means, e.g. a serration connecting surface, which interacts with the corresponding control means in the appurtenant seat in the basic body. In addition, the invention concerns a power skiving cutting insert as such.

First claim

What is claimed is:

1. A power skiving tool comprising:
a basic body having a peripheral rim located in a reference plane extending perpendicular to a center axis around which the rim is rotationally symmetrical, the rim including a plurality of tangentially spaced-apart seats, which individually include a bottom formed in the rim, as well as in a projection protruding radially from the same and in which a hole having a female thread mouths; and
a plurality of replaceable cutting inserts, each of the plurality of cutting inserts having an upper side, an underside, an endless circumference surface extending between the same, and a through hole, which extends between the upper and undersides, each individual cutting insert having a length extension defined by a longitudinal axis extending between front and rear ends, and including a cutting edge formed between a chip surface included in the upper side and a clearance surface included in the circumference surface, the cutting edge including three part edges, the three part edges being a nose edge and two flank edges converging toward the same, each individual cutting insert being mounted in an appurtenant seat with the nose edge protruding radially from the basic body, and fixed by a tightening screw tightened in the female thread of the hole, besides which the cutting edge of the individual cutting insert is laterally tipped-in at a lateral tipping-in angle of at least 5° in relation to the reference plane of the basic body, wherein each individual cutting insert is formed with only one cutting edge, the nose edge of which forms the front end of the cutting insert, and wherein a rear end of the cutting insert includes a shoulder surface, which runs perpendicular to the longitudinal axis of the cutting insert and is pressed against an adjusting mechanism arranged in an inner part of the seat for the fine adjustment of the radial position of the cutting insert and thereby of the cutting edge in relation to the center axis of the basic body, the underside of the cutting insert including a long narrow, female-like or male-like guide member, which runs parallel to the longitudinal axis of the cutting insert in engagement with an interacting, long narrow male-like or female-like guide member included in the bottom of the seat.

2. The tool according to claim 1 , wherein said guide members in the underside of the cutting insert and in the bottom of the seat are included in serration connecting surfaces of the type forming a plurality of mutually parallel ridges and grooves.

3. The tool according to claim 1 , wherein the rear shoulder surface of the cutting insert is flat, and extends at a right angle to the longitudinal axis of the cutting insert and the underside thereof.

4. The tool according to claim 1 , wherein the two flank edges of the cutting insert are unsymmetrical in relation to the longitudinal axis of the cutting insert by having a different contour shape.

5. The tool according to claim 4 , wherein an entering flank edge included in the cutting insert has a slightly S-like contour shape and another flank edge has a slightly C-like, convex contour shape.

6. The tool according to claim 1 , wherein the cutting edges of the individual cutting insert are radially tipped-in at a radial tipping-in angle in relation to the reference plane.

7. The tool according to claim 6 , wherein the radial tipping-in angle is at least 2° and at most 15°.

8. The tool according to claim 7 , wherein the radial tipping-in angle is 10°.

9. The tool according to claim 1 , wherein the lateral tipping-in angle is at most 30°.

10. The tool according to claim 9 , wherein the lateral tipping-in angle is 20°.

11. A cutting insert for a power skiving tool, comprising:
an upper side;
an underside;
an endless circumference surface extending between the upper side and underside;
a through hole extending between the upper and underside;
a length extension defined by a longitudinal axis extending between front and rear ends; and
a cutting edge formed between a chip surface included in the upper side and a clearance surface included in the circumference surface, the cutting edge having three part edges, the three part edges being a nose edge and two flank edges converging toward the nose edge, wherein the cutting insert is formed with only one cutting edge, the nose edge of which forms the front end of the cutting insert, and the rear end of the cutting insert forming a shoulder surface, which runs perpendicular to the longitudinal axis of the cutting insert, the underside including a guide member, which runs parallel to the longitudinal axis, the two flank edges being unsymmetrical in relation to the longitudinal axis of the cutting insert by having a different contour shape.

12. The cutting insert according to claim 11 , wherein said guide member is included in a serration connecting surface having a plurality of mutually parallel ridges and grooves.

13. The cutting insert according to claim 11 , wherein the rear shoulder surface is flat and extends perpendicular to both the longitudinal axis of the cutting insert and the underside.

14. The cutting insert according to claim 11 , wherein one flank edge has a slightly S-like contour shape, whereas the other flank edge has a slightly C-like, convex contour shape.

Assignees

• Sandvik Intellectual Property

Inventors

• Sjoo Sture

Classifications

• B23F21/106

  in exchangeable arrangement · CPC title

• B23F21/066

  in exchangeable arrangement · CPC title

• Y10T407/174

  Gear generating, revolving shaper cutting tool · CPC title

• Y10T407/24

  with chip breaker, guide or deflector · CPC title

• B23F5/163 Primary

  the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen" · CPC title