CA1176827A - Cutting insert - Google Patents
Cutting insertInfo
- Publication number
- CA1176827A CA1176827A CA000393142A CA393142A CA1176827A CA 1176827 A CA1176827 A CA 1176827A CA 000393142 A CA000393142 A CA 000393142A CA 393142 A CA393142 A CA 393142A CA 1176827 A CA1176827 A CA 1176827A
- Authority
- CA
- Canada
- Prior art keywords
- cutting insert
- insert according
- floor
- wall
- land area
- 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.)
- Expired
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)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
TITLE OF THE INVENTION
CUTTING INSERT
ABSTRACT OF THE DISCLOSURE
A polygonal cutting insert having two land areas behind its cutting edge is described. The secondary land is located below the cutting edge and has a descending wall which joins a sloping floor 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.
CUTTING INSERT
ABSTRACT OF THE DISCLOSURE
A polygonal cutting insert having two land areas behind its cutting edge is described. The secondary land is located below the cutting edge and has a descending wall which joins a sloping floor 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.
Description
117~2t7 B KGRO~ND OF THE INVENTION
In metalworking operations, it is desirable to remove material as rapidly as possible in order to minimize manufac-turing and labor cost. This requires that a cutting insert be designed that can stand up to the severe loads and heat gener-ated 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 Nos. 4,087,193 and 4,340,324. The first 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 other patent mentioned above discloses an indexable insert having a planar cutting edge land followed by a
In metalworking operations, it is desirable to remove material as rapidly as possible in order to minimize manufac-turing and labor cost. This requires that a cutting insert be designed that can stand up to the severe loads and heat gener-ated 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 Nos. 4,087,193 and 4,340,324. The first 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 other patent mentioned above discloses an indexable insert having a planar cutting edge land followed by a
-2-~176~Zt7 descending wall terminating in a floor sloping downwardly as it extends toward the center 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 down-wardly 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, ~he 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.
117~1~327 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 II-II in Figure 1 showing a cross section along the nose angle bisector.
Figure 3 is a view taken along arrows III-III 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 13. The secondary land 13 also extends inwardly and joins a secondary wall 15. The secondary wall 15 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.
1:1768Z~
As shown in Figure 1, this sloping floor 17 may join a plallar floor 19 which is most preferably parallel to a plane forsned by the cutting edges 9. In the center 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 wi~h the plane defined by the cutting edges 7. This angle A is most prefer-ably, 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.
~1768Z~;~
The design of the sloped floor 17 in conjunction with theangLe C formed by the secondary land 13 and the secondary descending wall 15 helps to form a conical chip on ~ery 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 dista~ce 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.
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 down-wardly 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, ~he 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.
117~1~327 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 II-II in Figure 1 showing a cross section along the nose angle bisector.
Figure 3 is a view taken along arrows III-III 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 13. The secondary land 13 also extends inwardly and joins a secondary wall 15. The secondary wall 15 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.
1:1768Z~
As shown in Figure 1, this sloping floor 17 may join a plallar floor 19 which is most preferably parallel to a plane forsned by the cutting edges 9. In the center 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 wi~h the plane defined by the cutting edges 7. This angle A is most prefer-ably, 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.
~1768Z~;~
The design of the sloped floor 17 in conjunction with theangLe C formed by the secondary land 13 and the secondary descending wall 15 helps to form a conical chip on ~ery 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 dista~ce 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 (11)
- The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
l. A cutting insert comprising a hard wear resistant body having a polygonal shape when viewed in top view, a peri-pheral 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 ex-tends 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 in the corner of said polygonal shape is 15 to 30 mils. - 2. A cutting insert according to Claim l wherein 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 com-prising 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 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 included 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 15 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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23665981A | 1981-02-23 | 1981-02-23 | |
US236,659 | 1981-02-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1176827A true CA1176827A (en) | 1984-10-30 |
Family
ID=22890441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000393142A Expired CA1176827A (en) | 1981-02-23 | 1981-12-23 | 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) | DE3206027C2 (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) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA836732B (en) * | 1982-09-30 | 1984-05-30 | Valeron Corp | Cutting insert with chip control |
GB2132517A (en) * | 1982-12-13 | 1984-07-11 | Gen Electric | Inserts for cutting tools |
DE3630404A1 (en) * | 1986-09-06 | 1988-03-17 | Mapal Fab Praezision | CUTTING INSERT |
SE502544C2 (en) * | 1994-07-05 | 1995-11-06 | Sandvik Ab | Inserts with micro chip switch located on the primary phase |
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 |
SE523617C2 (en) * | 2001-10-01 | 2004-05-04 | Sandvik Ab | Cuts for chip separating machining with chip breaking geometry |
JP2008246282A (en) * | 2007-03-29 | 2008-10-16 | Shinroku Seiki Kk | Muddy water purifying separator |
CN114309682A (en) | 2020-09-30 | 2022-04-12 | 肯纳金属公司 | Cutting insert |
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 GB GB8138924A patent/GB2093379B/en not_active Expired
- 1981-12-24 AU AU78897/81A patent/AU548165B2/en not_active Ceased
- 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 DE3206027A patent/DE3206027C2/en not_active Expired
- 1982-02-19 PT PT74467A patent/PT74467B/en unknown
- 1982-02-22 FR FR8202847A patent/FR2500342B1/en not_active Expired
- 1982-02-22 DK DK076282A patent/DK160194C/en not_active IP Right Cessation
- 1982-02-22 BE BE0/207369A patent/BE892221A/en not_active IP Right Cessation
- 1982-02-22 NO NO820547A patent/NO820547L/en unknown
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEC | Expiry (correction) | ||
MKEX | Expiry |