GB2093379A - Cutting insert - Google Patents
Cutting insert Download PDFInfo
- Publication number
- GB2093379A GB2093379A GB8138924A GB8138924A GB2093379A GB 2093379 A GB2093379 A GB 2093379A GB 8138924 A GB8138924 A GB 8138924A GB 8138924 A GB8138924 A GB 8138924A GB 2093379 A GB2093379 A GB 2093379A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutting insert
- insert according
- floor
- land area
- land
- 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
-
- 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
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/143—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having chip-breakers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Crushing And Pulverization Processes (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
A polygonal cutting insert has an upper surface comprising two land areas 9, 13 located inwardly of a cutting edge. A descending wall 11 connects a first land 9 adjacent the cutting edge 7 and a secondary land 13 located below the cutting edge and joining a secondary descending wall 15 which joins a sloping floor 17 extending toward the center of the insert. The sloping floor descends, both as it extends toward the center of the insert, and as it extends away from the nearest corner parallel to the side of the polygonal insert. <IMAGE>
Description
SPECIFICATION
Cutting insert
Background of the Invention
In metalworking operations, it is desirable to remove material as rapidly as possible in order to minimize manufacturing and labor cost. This requires that a cutting insert be designed that can stand up to the severe loads and heat generated at the high speeds, feed rates and depths of cut required to remove material rapidly.
It is also desirable that these inserts have a geometry that will minimize the power required in these metalworking operations by controlling the geometry of the chips produced. In addition, since not all applications require the same speed, depth of cut or feed rate, the insert chip control geometry should be capable of controlling chips over as wide a range of these parameters as possible.
Examples of prior insert designs which have attempted to resolve these problems are disclosed in United States Patent No. 4,087,193 and United
States Patent Application No. 181,965, filed in
August 28, 1980. The patent referred to discloses an indexable insert having a planar cutting edge land followed by a planar intermediate land below the cutting edge land. A secondary wall descends from the intermediate land to a planar floor which
parallels the plane containing the cutting edges.
According to this patent, the edge formed by the junction of the intermediate land and the secondary land acts to break chips as they slide over this edge.
The patent application mentioned above discloses an indexable insert having a planar
cutting edge land followed by a descending wall terminating in a floor sloping downwardly as it
extends toward the centre of the insert.
Brief Summary of the Invention
According to the present invention, a heavy duty cutting insert is provided having chip control
geometries designed to control chips and reduce
power consumption over a wide range of cutting
parameters.
The insert according to the present invention
comprises a cutting edge land area and an intermediate land area located behind and below
the cutting edge. In addition, located behind and
below the intermediate land is a floor that slopes
downwardly as it extends toward the center of the
insert.
Preferably, the insert is indexable and is
composed of a hard and wear resistant material
such as cemented carbide. Most preferably, the
insert is coated with a refractory oxide, nitride
and/or carbide material.
it is also preferable that the sloping floor be
symmetric about a plane containing the bisector of
the insert corner angle. In this manner, at those
high feed rates, beyond which the inner edge of the intermediate land may be ineffective as a
chipbreaker, the sloped floor can act to form a
conical chip and thereby reduce power consumption.
It is, therefore, an objective of the present
invention to provide a heavy duty cutting insert
designed to control chips and reduce power
consumption over a wide range of cutting
parameters.
This and other objectives of the present
invention will become more apparent upon review
of the drawings in conjunction with the following
detailed description of the invention.
Brief Description of the Drawings
Figure 1 is a perspective view of an
embodiment of a cutting insert according to the
present invention.
Figure 2 is a view taken along arrows Il-Il in
Figure 1 showing a cross section along the nose
angle bisector.
Figure 3 is a view taken along arrows Ill-Ill in
Figure 1 showing a cross section of the insert
midway between the corners.
Detailed Description of the Invention
Referring to the drawings in more detail, it can
be seen in Figure 1 that an indexable insert 1,
according to the present invention, is shown. The
insert comprises a polygonal body having a
peripheral wall 3 which forms a cutting edge 7 with the top surface 5 at the junction of the
peripheral wall and top surface.
The cutting edge 7 is joined to a cutting edge
land 9 which extends inwardly from the cutting edge. At the inner edge of the cutting edge land 9 is a descending wall 11 which descends inwardly and downwardly to a secondary land 1 3. The secondary land 13 also extends inwardly and joins a secondary wall 15. The secondary wall 1 5 joins a sloping floor 17 at its inner edge. The sloping floor 17 is symmetric about the bisectors of the corner angles. A bisector is shown in Figure 1 as line B-B.
As shown in Figure 1, this sloping floor 17 may join a planar floor 1 9 which is most preferably parallel to a plane formed by the cutting edges 9.
In the centre of the insert, an insert aperture 21 may be provided for receiving a locking pin or screw.
Referring to Figure 2, which is a cross section of the insert taken along line B-B, which was mentioned before as the bisector of one of the corner angles of the insert, it can be seen that the descending wall 11 forms an angle with the plane defined by the cutting edges 7. This angle A is most preferably, however, 20 to 12 degrees. The descending wall 11 joins the secondary land 13 at an angle B of 155 to 170 degrees.
It can also be seen in this figure that the sloping floor 17 forms an angle with a plane parallel to the cutting edge plane. This angle D should be between 1 to 10 degrees and, also, in viewing this figure, it can be seen that the sloping floor 17 makes its closest approach to the secondary land 13 in the corner area. This distance is shown by the symbol X in Figure 2.
Referring now to Figure 3, which is a cross section through the insert intermediate the corners, it can be seen that, as the sloping floor 17 extends away from the corner areas, it slopes downwardly parallel to the sides of the insert until it joins the planar floor 19. The maximum change in height, H, of the sloped floor 17 from the corner area to the planar floor 19 should be between 5 and 15 mils.
The design of the sloped floor 1 7 in conjunction with the angle C formed by the secondary land 1 3 and the secondary descending wall 15 helps to form a conical chip on very high feed rates and thereby minimized power consumption required in metalworking at those high feed rates in which the chip will slide down wall 15 and contact the sloped floor 17.
It is believed that angle C should be between 140 and 160 degrees to produce optimum results.
The distance X should preferably be 15 to 30 mils.
These embodiments shown in Figures 1 through 3 are only illustrative of the many possible embodiments that are within the scope of the appended claims.
Claims (13)
1. A cutting insert comprising a hard wear
resistant body having a peripheral wall and a top
surface; a cutting edge formed by a juncture
between said peripheral wall and said top surface;
said top surface having a land area extending
inwardly from said cutting edge, a wall descending
as it extends inwardly from said land area, a
secondary land area located inwardly of said
descending wall, a secondary wall descending as
it extends inwardly of said secondary land, and a floor sloping downwardly as it extends inwardly of
said secondary wall; and wherein the height, X, of
said secondary land above said sloping floor is 15 to 30 mils.
2. A cutting insert according to Claim 1 wherein
said body has a polygonal shape when viewed in top view; said sloping floor sloping downwardly as
it extends away from the nearest corner of said
polygonal shape parallel to the sides of said polygonal shape.
3. A cutting insert according to Claim 1 further comprising a planar floor extending inwardly from said sloping floor and defining a plane oblique to said sloping floor.
4. A cutting insert according to Claim 1 wherein said sloping floor is obliquely related to a plane defined by said land area.
5. A cutting insert according to Claim 1 wherein said top surface is polygonal in nature and said cutting edge and peripheral wall defining the sides and corners of said polygon.
6. A cutting insert according to Claim 5 wherein the height of said land area above said outermost end of said sloping floor is a minimum in said corners.
7. A cutting insert according to Claim 1 wherein said land area is substantially planar and said descending wall slopes downwardly from said land area at an angle of 12 to 20 degrees.
8. A cutting insert according to Claim 7 wherein said secondary land is substantially planar and substantially parallel to said land area, and wherein said descending wall and said secondary land area form an inclined angle of 155 to 170 degrees.
9. A cutting insert according to Claims 1 7 or 8 wherein said sloped floor has a vertical height change of 5 to 1 5 mils from highest to lowest point.
10. A cutting insert according to Claim 2 wherein said sloping floor is symmetric about a plane containing the bisector of the angle formed by said nearest corner.
11. A cutting insert according to Claim 1 wherein said sloping floor slopes downwardly at an angle, D, of 1 to 10 degrees.
12. A cutting insert substantially as hereinbefore described with reference to, and as illustrated in, the accompanying diagrammatic drawings.
13. Any features of novelty, taken singly or in combination, of the cutting insert as hereinbefore described with reference to the accompanying diagrammatic drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23665981A | 1981-02-23 | 1981-02-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2093379A true GB2093379A (en) | 1982-09-02 |
GB2093379B GB2093379B (en) | 1985-03-13 |
Family
ID=22890441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8138924A Expired GB2093379B (en) | 1981-02-23 | 1981-12-24 | Cutting insert |
Country Status (23)
Country | Link |
---|---|
JP (1) | JPS57156105A (en) |
KR (1) | KR880000259B1 (en) |
AU (1) | AU548165B2 (en) |
BE (1) | BE892221A (en) |
CA (1) | CA1176827A (en) |
CH (1) | CH651769A5 (en) |
DE (1) | DE3206027A1 (en) |
DK (1) | DK160194C (en) |
ES (1) | ES271905Y (en) |
FI (1) | FI83600C (en) |
FR (1) | FR2500342B1 (en) |
GB (1) | GB2093379B (en) |
IE (1) | IE53483B1 (en) |
IL (1) | IL64686A0 (en) |
IT (2) | IT8220837V0 (en) |
LU (1) | LU83950A1 (en) |
MX (1) | MX157199A (en) |
NL (1) | NL8200461A (en) |
NO (1) | NO820547L (en) |
NZ (1) | NZ199443A (en) |
PT (1) | PT74467B (en) |
SE (1) | SE450348C (en) |
ZA (1) | ZA818988B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2132517A (en) * | 1982-12-13 | 1984-07-11 | Gen Electric | Inserts for cutting tools |
FR2540762A1 (en) * | 1982-09-30 | 1984-08-17 | Valeron Corp | CUTTING TOOL, AND CUTTING PIECE REPORTED THE CONSTITUENT |
US5897272A (en) * | 1994-07-05 | 1999-04-27 | Sandvik Ab | Cutting insert having a micro ridge chip breaker |
EP1297922A1 (en) * | 2001-10-01 | 2003-04-02 | Sandvik Aktiebolag | Cutting insert for chip removing machining |
US11878352B2 (en) | 2020-09-30 | 2024-01-23 | Kennametal Inc. | Cutting insert |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3630404A1 (en) * | 1986-09-06 | 1988-03-17 | Mapal Fab Praezision | CUTTING INSERT |
DE10207768A1 (en) * | 2001-07-26 | 2003-03-06 | Ceramtec Ag | Cutting plate with clamping surface has circumferential cutting edge adjoined by parallel aligned stock removing trough dropping down towards centre |
JP2008246282A (en) * | 2007-03-29 | 2008-10-16 | Shinroku Seiki Kk | Muddy water purifying separator |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL153109B (en) * | 1966-06-01 | 1977-05-16 | Sandco Ltd | CUTTING ELEMENT FOR A MACHINING TOOL MACHINE. |
SE349759B (en) * | 1971-10-27 | 1972-10-09 | Sandvik Ab | |
US4087193A (en) * | 1976-08-31 | 1978-05-02 | Allen J. Portnoy | Cutting tool with chip breaker |
US4056871A (en) * | 1976-10-21 | 1977-11-08 | Kennametal Inc. | Cutting insert |
GB2035859B (en) * | 1978-11-17 | 1982-08-25 | Kennametal Inc | Cutting insert |
IL58006A (en) * | 1979-08-08 | 1983-02-23 | Iscar Ltd | Cutting insert with chip control means |
US4340324A (en) * | 1980-08-28 | 1982-07-20 | Kennametal Inc. | Cutting insert |
-
1981
- 1981-12-23 CA CA000393142A patent/CA1176827A/en not_active Expired
- 1981-12-24 AU AU78897/81A patent/AU548165B2/en not_active Ceased
- 1981-12-24 GB GB8138924A patent/GB2093379B/en not_active Expired
- 1981-12-29 SE SE8107815A patent/SE450348C/en not_active IP Right Cessation
- 1981-12-29 ZA ZA818988A patent/ZA818988B/en unknown
- 1981-12-30 IL IL64686A patent/IL64686A0/en unknown
-
1982
- 1982-01-08 NZ NZ199443A patent/NZ199443A/en unknown
- 1982-01-15 KR KR8200157A patent/KR880000259B1/en active
- 1982-01-19 IE IE100/82A patent/IE53483B1/en unknown
- 1982-01-19 FI FI820155A patent/FI83600C/en not_active IP Right Cessation
- 1982-01-23 MX MX191202A patent/MX157199A/en unknown
- 1982-01-28 ES ES1982271905U patent/ES271905Y/en not_active Expired
- 1982-02-05 NL NL8200461A patent/NL8200461A/en not_active Application Discontinuation
- 1982-02-08 JP JP57018688A patent/JPS57156105A/en active Granted
- 1982-02-12 IT IT8220837U patent/IT8220837V0/en unknown
- 1982-02-12 IT IT19636/82A patent/IT1149633B/en active
- 1982-02-16 CH CH953/82A patent/CH651769A5/en not_active IP Right Cessation
- 1982-02-17 LU LU83950A patent/LU83950A1/en unknown
- 1982-02-19 DE DE19823206027 patent/DE3206027A1/en active Granted
- 1982-02-19 PT PT74467A patent/PT74467B/en unknown
- 1982-02-22 BE BE0/207369A patent/BE892221A/en not_active IP Right Cessation
- 1982-02-22 DK DK076282A patent/DK160194C/en not_active IP Right Cessation
- 1982-02-22 FR FR8202847A patent/FR2500342B1/en not_active Expired
- 1982-02-22 NO NO820547A patent/NO820547L/en unknown
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2540762A1 (en) * | 1982-09-30 | 1984-08-17 | Valeron Corp | CUTTING TOOL, AND CUTTING PIECE REPORTED THE CONSTITUENT |
GB2132517A (en) * | 1982-12-13 | 1984-07-11 | Gen Electric | Inserts for cutting tools |
US5897272A (en) * | 1994-07-05 | 1999-04-27 | Sandvik Ab | Cutting insert having a micro ridge chip breaker |
EP1297922A1 (en) * | 2001-10-01 | 2003-04-02 | Sandvik Aktiebolag | Cutting insert for chip removing machining |
US6715967B2 (en) | 2001-10-01 | 2004-04-06 | Sandvik Aktiebolag | Cutting insert for chip removing machining |
US11878352B2 (en) | 2020-09-30 | 2024-01-23 | Kennametal Inc. | Cutting insert |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921224 |