Method of machining a rotationally symmetric surface of a workpiece and turning apparatus

Patent metadata

Field	Value
Publication number	US-11077501-B2
Application number	US-201616316427-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Sep 9, 2016
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

In accordance with various illustrative embodiments of the present disclosure, a rotationally symmetric surface of a workpiece is machined by a turning apparatus, wherein the workpiece is rotationally driven around a rotational axis, a cutting tool with a cutting edge positioned at the edge of a rake face is arranged relative to the workpiece, the cutting tool is brought into contact with the workpiece, and the cutting tool is advanced relative to the workpiece along a feed direction parallel to the rotational axis, the normal to the rake face being tilted relative to the feed direction, a first axis and a second axis, the first axis and the second axis are perpendicular to the feed direction and perpendicular to each other.

First claim

The invention claimed is:

1. A method of machining a rotationally symmetric surface of a workpiece, said method comprising:
rotationally driving said workpiece around a rotational axis,
arranging a cutting tool with a cutting edge positioned at an edge of a rake face relative to said workpiece,
bringing said cutting tool into contact with said workpiece, and
advancing said cutting tool relative to said workpiece along a feed direction parallel to said rotational axis,
wherein a normal to said rake face is tilted relative to said feed direction, a first axis and a second axis, the first axis and the second axis being perpendicular to the feed direction and perpendicular to each other,
wherein a direction of said normal of said rake face is set to a direction (i) rotated around said first axis by an angle α from a start direction identical to a direction of said second axis, such that said normal from said rake face is directed to said feed direction and (ii) rotated around a third axis by an angle δ such that said normal from said rake face is directed to said feed direction, and said third axis corresponds to an axis which originally corresponds to said rotational axis and is rotated around said first axis by said angle α,
wherein said angle α is in a range from 35° to 60°,
wherein said angle δ is in a range from 0° to 15°, and
wherein a feed rate of said cutting tool is in a range from 0.2 mm per revolution to 1.2 mm per revolution.

2. The method of claim 1 , wherein said cutting edge has the shape of a straight line.

3. The method of claim 1 , wherein said cutting edge has the shape of a curved line.

4. The method of claim 3 , wherein said cutting edge is curved away from said workpiece towards at least one end of said cutting edge.

5. The method of claim 3 , wherein a diameter of said workpiece is determined at said rotationally symmetric surface of said workpiece, and wherein said curved line corresponds to a circular arc of a circle having a radius, said radius being greater than one quarter of said diameter.

6. The method of claim 1 , wherein said rotationally symmetric surface of said workpiece is an outer circumferential surface of said workpiece.

7. The method of claim 1 , wherein said rotationally symmetric surface of said workpiece is an inner circumferential surface of said workpiece.

8. The method of claim 7 , wherein said cutting edge has the shape of a curved line, wherein a diameter of said workpiece is determined at said rotationally symmetric surface of said workpiece, and wherein said curved line corresponds to a circular arc of a circle having a radius, said radius being greater than one quarter of said diameter and said radius being smaller than one half of said diameter.

9. The method of claim 1 , wherein upon engaging said workpiece, said cutting edge contacts said workpiece along an active cutting portion of said cutting edge, an effective length of said active cutting portion being smaller than a total length of said cutting edge.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Abe Makoto
• Zeiner Christoph

Classifications

• B23B27/148

  Composition of the cutting inserts · CPC title

• B23B27/005 Primary

  Geometry of the chip-forming or the clearance planes, e.g. tool angles (B23B27/141 and B23B27/22 take precedence) · CPC title

• B23B1/00 Primary

  Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23Q7/00

  Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting (incorporated in working-spindles B23B13/00) · CPC title

• B23B2200/28

  Angles · CPC title