GB2157205A - Cutting tools - Google Patents
Cutting tools Download PDFInfo
- Publication number
- GB2157205A GB2157205A GB08508930A GB8508930A GB2157205A GB 2157205 A GB2157205 A GB 2157205A GB 08508930 A GB08508930 A GB 08508930A GB 8508930 A GB8508930 A GB 8508930A GB 2157205 A GB2157205 A GB 2157205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- insert
- seating
- face
- side faces
- cutting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1614—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
- B23B27/1622—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert characterised by having a special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/16—Supporting or bottom surfaces
- B23B2200/163—Supporting or bottom surfaces discontinuous
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
A scarfing tool for trimming weld beads on welded metal tubes has a replaceable cutting insert (8) with alternative concave cutting edges (26) on a pair of opposite side faces (20) and flat extensions (28) at the ends of these cutting edges. The insert is secured in a seating (6) in a holder (2) by a screw (10) through a central hole (12) in the insert, the extensions of the non-operative cutting edge abutting a rear face (22) of the seating. The seating and the insert have complementary bottom faces (16, 32) with a V-form transverse cross-section to hold the insert more firmly against movement in the seating. <IMAGE>
Description
SPECIFICATION
Cutting tools
This invention relates to cutting tools for trimming the weld beads on welded metal tubes.
These tools, also sometimes known as scarfing tools, are required to operate in heavy duty conditions to, in effect, plane off the external bead of a weld running along an axial seam of a welded steel tube. They are therefore made with a brazed-on cutting tip ground to give a concave edge conforming to the radius of a curvature of the tube cross-section.
According to one aspect of the present invention, there is provided a tool comprising a holder and a replaceable cutting insert, the insert having concave cutting edges on a pair of opposite side faces, each said side face having co-planar lateral end extensions beyond said concave cutting edges for location against a rear face of a seating for the insert in the holder, a locking screw for securing the insert in said seating passing through a central aperture in the insert midway between said cutting edges.
According to another aspect of the invention, there is provided a replaceable cutting insert for such a tool.
Preferably, the insert has a bottom face with a downward projection extending transversely to said side faces supported in a complementary bottom face of the seating. In particular, said complementary faces may be so configured as to have a
V-form cross-section in a plane parallel to said opposite side faces.
An example of the invention is shown in the accompanying drawings, wherein;
Figures 1 to 3 are mutually transverse views of a tool according to the invention, and
Figures 4 to 6 are mutually transverse views illustrating in more detail the cutting insert of the tool in Figs. 1 to 3.
The tool comprises a holder 2 with a rectangular section shank 4 having a seating 6 at its forward end for a replaceable cutting insert 8. The insert is secured by a locking screw 10 passing through a counter-sunk clearance hole 12 in the centre of the insert into a tapped bore 14 in the bottom face 16 of the seating. The insert is thereby clamped onto the seating bottom face, with its rear side face 20 located against an inclined rear face 22 of the seating, to be set at a top rake angle of 5 relative to the longitudinal axis of the shank.
The insert has a substantially rectangular plan form with corresponding front and rear side faces 20. In each face 20, a concave cutting edge 26 extends over some 80% of the face width between flat, co-planar end extensions 28. These side faces lie at 64 to the flat top face 30 of the insert. The bottom face of the insert is of V-form in transverse cross-section, with planar inclined portions 32 on each side of a central flat 34, said portions subtending an angle of 140 . The lateral side faces 36 of the insert are perpendicular to the top face 30.
The holder seating bottom face 16 has inclined portions providing a complementary V-form to that of the insert bottom face, and a transverse relief slot 42 separates the bottom face 16 from the rear face 22.
When the insert is secured by the locking screw, therefore, it is held firmly against rotation about the axis of the screw and against lateral displacement, by virtue of the engagement of the V-form faces 16, 32. Rearward displacement by the cutting forces acting on the insert is prevented by abutment of the flat extensions 28 at the rear face of the insert against the seating rear face 22, so holding the reserve concave cutting edge clear of the seating rear face.
In use, the tool is employed with a planing action to remove the axial weld bead on a welded steel tube in a single pass, the holder being inclined rearwards relative to the tube surface, so that the insert has a resultant top rake angle of 20 and a clearance angle of 6 .
1. A replaceable cutting insert having concave cutting edges on a pair of opposite side faces, each said side face having co-planar lateral end extensions beyond said concave cutting edge for abutment of the insert against a rear location, midway between said cutting edges the insert having a central aperture to receive a securing element.
2. An insert according to claim 1 having a bottom face with a downward projection extending transversely to said side faces for engagement with a supporting seating.
3. An insert according to claim 2 wherein said projection has a V-from cross-section in a plane parallel to said side faces.
4. An insert according to claim 3 wherein said
V-form cross-section projection extends from a further pair of side faces transverse to the side faces carrying said cutting edges.
5. An insert according to any one of claims 2 to 4 wherein said projection has a flat forming its lowermost extremity.
6. A tool comprising a holder and a replaceable cutting insert, the insert having concave cutting edges on a pair of opposite side faces, each said side face having co-planar lateral end extensions beyond said concave cutting edges for location against a rear face of a seating for the insert in the holder, a securing element for securing the insert in said seating passing through a central aperture in the insert midway between said cutting edges.
7. A tool according to claim 6 wherein the insert has a bottom face with a downward projection extending transversely to said side faces and supported in a complementary bottom face of the seating.
8. A tool according to claim 7 wherein said complementary faces are so configured as to have a V-form cross-section in a plane parallel to said opposite side faces.
9. A tool according to claim 7 or claim 8 wherein the seating has a clearance relief between
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. A replaceable cutting insert having concave cutting edges on a pair of opposite side faces, each said side face having co-planar lateral end extensions beyond said concave cutting edge for abutment of the insert against a rear location, midway between said cutting edges the insert having a central aperture to receive a securing element.
2. An insert according to claim 1 having a bottom face with a downward projection extending transversely to said side faces for engagement with a supporting seating.
3. An insert according to claim 2 wherein said projection has a V-from cross-section in a plane parallel to said side faces.
4. An insert according to claim 3 wherein said
V-form cross-section projection extends from a further pair of side faces transverse to the side faces carrying said cutting edges.
5. An insert according to any one of claims 2 to 4 wherein said projection has a flat forming its lowermost extremity.
6. A tool comprising a holder and a replaceable cutting insert, the insert having concave cutting edges on a pair of opposite side faces, each said side face having co-planar lateral end extensions beyond said concave cutting edges for location against a rear face of a seating for the insert in the holder, a securing element for securing the insert in said seating passing through a central aperture in the insert midway between said cutting edges.
7. A tool according to claim 6 wherein the insert has a bottom face with a downward projection extending transversely to said side faces and supported in a complementary bottom face of the seating.
8. A tool according to claim 7 wherein said complementary faces are so configured as to have a V-form cross-section in a plane parallel to said opposite side faces.
9. A tool according to claim 7 or claim 8 wherein the seating has a clearance relief between the seating bottom and rear faces.
10. A replaceable cutting insert constructed and arranged for use substantially as described herein with reference to the accompanying drawings.
11. A scarfing tool constructed and arranged for use substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848409109A GB8409109D0 (en) | 1984-04-09 | 1984-04-09 | Cutting tools |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8508930D0 GB8508930D0 (en) | 1985-05-09 |
GB2157205A true GB2157205A (en) | 1985-10-23 |
GB2157205B GB2157205B (en) | 1987-03-11 |
Family
ID=10559400
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB848409109A Pending GB8409109D0 (en) | 1984-04-09 | 1984-04-09 | Cutting tools |
GB08508930A Expired GB2157205B (en) | 1984-04-09 | 1985-04-04 | Cutting tools |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB848409109A Pending GB8409109D0 (en) | 1984-04-09 | 1984-04-09 | Cutting tools |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8409109D0 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006061817A1 (en) * | 2004-12-07 | 2006-06-15 | Iscar Ltd. | Cutting tool and cutting insert therefor |
US7261498B2 (en) * | 2004-12-27 | 2007-08-28 | Iscar Ltd. | Deburring tool and cutting insert therefor |
JP2012510380A (en) * | 2008-12-11 | 2012-05-10 | デグテック エルティーディー | Cutting tools |
US8616809B2 (en) * | 2007-01-17 | 2013-12-31 | James F. Farrell | Toolholder |
US9592560B2 (en) | 2013-03-22 | 2017-03-14 | Kennametal India Limited | Cutting insert with a linear and a concave cutting edge portion |
US9724761B2 (en) | 2013-03-22 | 2017-08-08 | Kennametal India Limited | Cutting insert with a linear and a concave cutting edge portion |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1419744A (en) * | 1973-03-15 | 1975-12-31 | Carmet Co | Cutting inserts suitable for metal cutting machine tools |
GB2081142A (en) * | 1980-08-04 | 1982-02-17 | Wimet Ltd | Profiling Insert and Holder |
-
1984
- 1984-04-09 GB GB848409109A patent/GB8409109D0/en active Pending
-
1985
- 1985-04-04 GB GB08508930A patent/GB2157205B/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1419744A (en) * | 1973-03-15 | 1975-12-31 | Carmet Co | Cutting inserts suitable for metal cutting machine tools |
GB2081142A (en) * | 1980-08-04 | 1982-02-17 | Wimet Ltd | Profiling Insert and Holder |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006061817A1 (en) * | 2004-12-07 | 2006-06-15 | Iscar Ltd. | Cutting tool and cutting insert therefor |
US7090443B2 (en) | 2004-12-07 | 2006-08-15 | Iscar Ltd. | Cutting tool and cutting insert therefor |
US7326006B2 (en) | 2004-12-07 | 2008-02-05 | Iscar Ltd. | Cutting tool and cutting insert therefor |
US7261498B2 (en) * | 2004-12-27 | 2007-08-28 | Iscar Ltd. | Deburring tool and cutting insert therefor |
US8616809B2 (en) * | 2007-01-17 | 2013-12-31 | James F. Farrell | Toolholder |
JP2012510380A (en) * | 2008-12-11 | 2012-05-10 | デグテック エルティーディー | Cutting tools |
US8596933B2 (en) | 2008-12-11 | 2013-12-03 | Taegutec, Ltd. | Cutting tool having pocket bottom with base and inclined surfaces |
US9592560B2 (en) | 2013-03-22 | 2017-03-14 | Kennametal India Limited | Cutting insert with a linear and a concave cutting edge portion |
US9724761B2 (en) | 2013-03-22 | 2017-08-08 | Kennametal India Limited | Cutting insert with a linear and a concave cutting edge portion |
Also Published As
Publication number | Publication date |
---|---|
GB8409109D0 (en) | 1984-05-16 |
GB2157205B (en) | 1987-03-11 |
GB8508930D0 (en) | 1985-05-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |