CA2005584A1 - Cutting insert for low ranges of feed and depth of cut - Google Patents
Cutting insert for low ranges of feed and depth of cutInfo
- Publication number
- CA2005584A1 CA2005584A1 CA002005584A CA2005584A CA2005584A1 CA 2005584 A1 CA2005584 A1 CA 2005584A1 CA 002005584 A CA002005584 A CA 002005584A CA 2005584 A CA2005584 A CA 2005584A CA 2005584 A1 CA2005584 A1 CA 2005584A1
- Authority
- CA
- Canada
- Prior art keywords
- control surface
- corner
- chip
- ascending
- cutting insert
- 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.)
- Abandoned
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 91
- 230000001174 ascending effect Effects 0.000 claims abstract description 64
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000005304 joining Methods 0.000 claims description 7
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 235000014443 Pyrus communis Nutrition 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims description 2
- 101100008050 Caenorhabditis elegans cut-6 gene Proteins 0.000 claims 1
- 238000003754 machining Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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
- B23B27/141—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
- Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
- Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An indexable cutting insert of the type having a corner radius and a corner angle adapted for finishing operations comprises a pair of substantially parallel spaced apart faces and at least one peripheral side surface being substantially normal to said faces. A pair of straight cutting edges extend away from the corner at the juncture of the peripheral side surface and a plane positioned closely adjacent and below the juncture of a respective face. To break the chips formed during cutting, a chip breaker recess extents rearwardly and along the cutting edges. The chip breaker recess includes a descending control surface leading to the bottom of the recess followed by an ascending control surface. The descending control surface comprises a first and second planar descending control surface with the first surface being at a shallow angle and the second surface being at a steep angle. The ascending surface directs the chip upwardly toward a central island formed within the plane of a respective face and away from the insert and the cutting edge. The chip breaker recess incorporates an additional shallow chip control recess formed by a raised land extending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surface extending above the bottom of the main chip breaker recess and around the corner. The additional chip control surfaces forming the shallow recess include an ascending corner chip control surface extending upwardly from the raised corner bottom control surface at a relatively steep angle. The recess is configured to change the curling motion of the chip at various depths of cut to enhance the chip breaking forces.
An indexable cutting insert of the type having a corner radius and a corner angle adapted for finishing operations comprises a pair of substantially parallel spaced apart faces and at least one peripheral side surface being substantially normal to said faces. A pair of straight cutting edges extend away from the corner at the juncture of the peripheral side surface and a plane positioned closely adjacent and below the juncture of a respective face. To break the chips formed during cutting, a chip breaker recess extents rearwardly and along the cutting edges. The chip breaker recess includes a descending control surface leading to the bottom of the recess followed by an ascending control surface. The descending control surface comprises a first and second planar descending control surface with the first surface being at a shallow angle and the second surface being at a steep angle. The ascending surface directs the chip upwardly toward a central island formed within the plane of a respective face and away from the insert and the cutting edge. The chip breaker recess incorporates an additional shallow chip control recess formed by a raised land extending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surface extending above the bottom of the main chip breaker recess and around the corner. The additional chip control surfaces forming the shallow recess include an ascending corner chip control surface extending upwardly from the raised corner bottom control surface at a relatively steep angle. The recess is configured to change the curling motion of the chip at various depths of cut to enhance the chip breaking forces.
Description
CUTTING INSERT FOR LOW RANGES OF
FEED AND DEPTH OF CUT
Field of the Invention The present invention relates to indesable cutting inserts having an improved chip breaker form that is particularly desirable for low ranges of feed and depth of cut.
Backaround of the Invention Indesable cutting inserts for detachable mounting on a tool holder, are generally made of cemented carbide material or ceramic material and are formed by hot pressing or cold preæsing and sintering techniques. These inserts typically are available in standard sizes and frequently employ chip breaker control suraces in the form of a recess e~tending around the peripheral edge of the insert to break chips as they are formed during a cutting operation.
Modern N/C machining operations in automated factories put high demand on reliable chip flow, durable tool life, and lower machining costs. General purpose chip breakers and chip breaker provided on negative rake inserts do not produce acceptable chip forms and eshibit chipping in machining ductile materials at high speeds and low ranges of feed and depth of cut.
~7~
FEED AND DEPTH OF CUT
Field of the Invention The present invention relates to indesable cutting inserts having an improved chip breaker form that is particularly desirable for low ranges of feed and depth of cut.
Backaround of the Invention Indesable cutting inserts for detachable mounting on a tool holder, are generally made of cemented carbide material or ceramic material and are formed by hot pressing or cold preæsing and sintering techniques. These inserts typically are available in standard sizes and frequently employ chip breaker control suraces in the form of a recess e~tending around the peripheral edge of the insert to break chips as they are formed during a cutting operation.
Modern N/C machining operations in automated factories put high demand on reliable chip flow, durable tool life, and lower machining costs. General purpose chip breakers and chip breaker provided on negative rake inserts do not produce acceptable chip forms and eshibit chipping in machining ductile materials at high speeds and low ranges of feed and depth of cut.
~7~
When machining a ductile material at high speeds, a stationary plastic deformation occurs in the shear zone and the formed chip is continuous and straight with smooth f low on the face of the tool. At low ranges of feed and depth of cut, the continuous straight chip is thin and narrow, therefore, it requires an additional deformation to break. In other words, a higher breaking strain is required. The present invention is directed to an insert which enhances the breakage of thin and narrow chips which are generally created under conditions of low feed and light depths of cut.
U.S. Patent 4,685,844 to McCreery describes an indesable and invertible cutting insert having cutting edges and a positive rake surface which appears conves when viewed in cross section.
U.S. Patent 4,214,845 to Yoshikatsu describes a polygonal throw away insert including an insert body having two opposite, parallel major surfaces and a plurality of sides. A cutting edge is formed along a line where each of the sides joins each of the surfaces. A ramp estends from each cutting edge downwardly towards the center of at least one of the two major surface~ of the insert body. A pair of first chip breaking projsctions are provided on the ramp adjacent each corner of the insert body in a symmetrical relationship with respective to the bisector of the corner and a second chip breaking projection is provided on the bisector behind the first projection~.
U.S. Patent 3,815,192 to Ohtsu describes a polygonal throw away in8ert to be detachably mounted in a tool holder having a (~ jt~
_3_ D-88-2-156 plurality of cutting edges on one major surface of the insert body along the edges of all the sides thereof and a plurality of projection rows provided on said major surface along and spaced from the cutting edges so as to form chip breakers.
Adjacent projections in each projection row define chip curling zones therebetween.
Summary of the Invention It is an object of the present invention to provide a chip form for an insert which promotes breaking strain for thin and narrow chips over a wide range of operations which are encountered in different metal removal industries.
It is a further object of the present invention to configure the chip breaker so a ductile chip breaks at moderate to high speeds and low ranges of feed and depth of cut.
It is a further object of the present invention to lower the cutting forces while generating less wear and achieve improved tool life.
It i~ a further object of the present invention to achieve durable tool life and good to e~cellent resistance to crater and edge build-up.
It i8 an object of the present invention to obviate one or more disadvantage~ of the prior art.
Other and further objects of the present invention will be apparent to one of ordinary skill in the art from reading of the detailed 8pecification.
2~S5~4 _4_ D-88-2-156 With the insert of the present invention, the chip breaker recess is configured to achieve enhanced chip breaking at feed rates on the order of about 0.005 to about 0.200 inch per revolution and depth of cut on the order of from about 0.010 to about 0.125. The chip which is formed during cutting is influenced by the configuration of the control surfaces forming the chip breaker. Typically, a chip flowing over the cutting edge, first encounters a descending control surface. The flowing chip nest encounters the bottom of the chip breaker recess followed by an ascending control surface which directs the chip upwardly and outwardly. In the present invention, the chip breaker recess incorporates additional corner chip control surfaces formed by a raised land estending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surface. The additional corner chip control surfaces form a shallow groove which enhances the plastic deformation of chips at light depths of cut less than 0.05 inch.
In accordance with the present invention, an indesable cutting insert of the type having a corner radius and a corner angle adapted for finishing operations comprises a pair of substantially parallel spaced apart faces and at least one peripheral side surface being substantially normal to said faces. A pair of straight cutting edge estend away from the corner at the juncture of the peripheral side surface and a plane positioned closely adjacent and below the juncture of a respective face. To break the chips formed during cutting, a Chip breaker recess estents rearwardly and along the cutting edges. The chip breaker recess includes a descending control ~urface leading to the bottom of the recess followed by an 2C~ 8~
ascending control surface. The descending control surface comprises a first and second planar descending control surface with the first surface beina at a shallow angle and the second surface being at a steep angle. The ascending surface directs the chip upwardly toward a central island formed within the plane of a respective face and away from the insert and the cutting edge. In the present invention, the chip breaker recess incorporates additional shallow chip control recess formed by a raised land estending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surace extending above the bottom of the main chip breaker recess and around the corner. The additional chip control surfaces forming the shallow recess include an ascending corner chip control surface e~tending upwardly from the raised corner bottom control surface at a relatively steep angle. The recess is configured to change the curling motion of the chip at various depths of cut to enhance the chip breaking forces.
Detailed DescriDtion of the Drawinas Figure 1 is a top-elevational view of an embodiment of an insert of the present invention.
Fiqure 2 is a partial sectional view of a corner chip breaker along 8ection 2-2 of Figure l;
Figure 3 is a partial sectional view of a chip breaker along a portion of section 3-3 of Figure l;
Figure 4 i8 a detailed sectional view of a raised land along section 4-4 of Figure l;
ZC1~ 58~-i Figure S is a top-elevational view of another embodiment of an insert of the present invention.
Figure 6 is a partial sectional view of a corner chip breaker along section 6-6 of Figure 5;
Figure 7 is a partial sectional view of a chip breaker along a portion of section 7-7 of Figure 5;
Figure 8 is a top-elevational view of another embodiment of an insert of the present invention.
Figure 9 is a partial sectional view of a corner chip breaker along section 9-9 of Figure 8;
Figure 10 i~ a partial sectional view of a chip breaker along a portion of section 10-10 of Figure 8;
Figure 11 i~ a top-elevational view of another embodiment of an insert of the present invention.
Figure 12 is a partial sectional view of a corner chip breaker along section 12-12 of Figure 11;
Figure 13 i~ a partial sectional view of a chip breaker along a portion of ~ection 13-13 of Figure 11.
h~Lh ~ of the Preferred Embodiment As shown in Figure 1, the cutting insert 15 includes a pair of s~aced parallel faces with peripheral side sureace~ 21-23 5~ ~
positioned therebetween. One face which forms an island is shown at 17 while the other face is not shown in the figure.
The peripheral side surfaces 21-23 which lie in respective planes substantially normal to the parallel faces form straight cutting edges 41-43 which substantially lie in a cutting plane positioned just below a respective face 17. The side surfaces 21 to 23 form adjacent side surfaces which merge at the rounded corners 25-27 of the insert 15. The rounded cutting corners 25-27 for finishing operations generally a have a radius of less than 0.04, preferably less than 0.03 and more preferably less than about 0.015 inch for enhancing the accuracy of finishing operations. Pairs of adjacent side surfaces, for e~ample 21 and 22, have an included angle of less than 90 degrees to obtain the desired clearance desired for finishing operations. Polygonal shapes such as triangular or rhomboidal are preferred for obtaining inde-ability. The side clearance angle at the corners is preferably less than 90 degrees. This angle i8 the included angle between respctive side surfaces and i8 preferably less than 85 degrees.
For mounting purposes, the insert lS may be provided with a opening 35 estending entirely through the insert 15 from the one face 17 to the other face. In the interior region , the opening 35 has ~traight sides e~tending in a direction normal to the faces. In the region adjacent a respective face, the opening bevels outwardly for accommodating the head of a threaded screw which can be used to provide secure attachment of the insert 15 to a tool.
For purposes of the following discussion, inwardly or the inward direction is toward the center of the insert while outwardly or the outward direction is in a direction away from 20~3~ 8 ;~
the center of the insert. with reference to chip f low over a cutting edge, the radial direction is generally perpendicular to the cutting edge while the axial direction is parallel to the cutting edge. Unless specifically mentioned otherwise, the various angles referred to are with reference to the plane of an adjacent face surface. Also, dimensions are in inchs unless otherwise specified.
The cutting edges 41-43 may be slightly beveled or rounded to reduce cracking when the edge impacts the work to be cut.
To break the chips formed during cutting, a chip breaker recess 33 estents rearwardly away from and along the cutting edges 41-43 around the periphery of the insert lS. The chip breaker recess 33 includes a descending control surface 34 leading to the bottom of the chip breaker recess 33 followed by an ascendinq control surface 36 leading to the central island 17.
The ascending control surface 36 directs the chip upwardly toward a respective one of the parallel faces and away from the insert 15 and the cutting edge.
As generally illustrated in the drawings, the descending control surface 34 comprises a first descending control surface 51 and a second de wending control surface 53 with the first surface being at a shallow angle and the second surface being at a steep angle. The raised land 55 estending outwardly toward a corner 25 from the central island 17 along a bisector of a respective corner 25 and a raised corner bottom control surfac'e 57 estending above the bottom of the remaining portion of chip breaker rece8s 33 and around the corner 25 form an additional shallow chip control recess 59. The shallow recess 59 is formed by additional chip control surfaces which include an ascending corner chip control surface 61 estending upwardly ~o~
_9- D-88-2-156 from the raised corner bottom colltrol surface 57 to the raised land 55 at a relatively steep angle. In the corner area, a descending corner chip control surface which extends downwardly from the cutting edge 42 at the corner 25 is formed by a portion of the descending control surface 34. The shallow recess 59 merges with a remaining portion of the chip breaker recess 33 and is configured to change the curling motion of the chip at light depths of cut to enhance the chip breaking forces. Since the corners of the insert are identical in construction, it is believed that a description of only one, as set forth above and below, will suffice.
The first descending control surface 51 is planar and estends inwardly from the cutting edge 42 at a shallow angle to add strength to the cutting edge 42. The angle is from about 9 to about 15 degrees and preferably at about 12 degrees as measured wi~h reference to the island 36. The second descending control surface 53 is planar and e~tends inwardly from the first descending control surface 51 to the bottom of the chip breaker recess 33 at a steep angle of from about 22 to about 32 degrees and preferably at about 27 degrees The first descending control surface 51 at a shallow angle lifts the chip at low ranges of feed and depth of cut. At higher ranges, the steeper second descending control surface 53 interrupts the continuou~ motion of the chip to promote curling. The width of the descending control surface 34 is from about 0.015 to about 0.04 inch, preferably about 0.0250. In the corner area, the width of the descending control surface 34 is from about 0.015 to about 0.02 inch, preferably about 0.0185. The bottom of the chip breaker recess 33 along the main portion of the chip breaker includes a bottom flat control surface 71 parallel to the re~pective face or island 17 at a distance of about 0.01 to ~o~
-lO- D-88-2-156 about 0.02 from the island or preferably a distance of about 0.0152. The width of the bottom flat control surface 71 is from about 0.01 to about 0.015 and preferably about 0.0126 inch. The ascending control surface 36 is curved concave backwall joining the bottom flat control surface 71 to the island 17 and having a radius of from about O.OS to about 0.1 inch and preferably about 0.075 inch.
The ascending corner chip control surface 61 has a width of from about 0.015 to about 0.03 and preferably about 0.023 inch as measured along a bisector of a respective corner. The ascending corner chip control surface 61 comprises a first ascending corner chip control surface 75 and second ascending corner chip control surface 77. The first surface 75 e~tends upwardly from the raised corner bottom chip control surface 57 at a relatively steep angle of from about 33 to about 47 degrees, preferable at an angle of about 40 degrees. The second surface 77 estends upwardly from the first surface 75 to the raised land 55 formed as part of the island 17 at a less steep angle of from about lS to about 31 degrees, preferable at an angle of about 23 degrees. At the corner most position, the first surface 75 joins the raised corner bottom chip control surface 57 while the rearward portion joins the ascending control surface 34. The ascending corner chip control surface 61 is present at the corner nose section of the insert 15 in the form of a pear shaped head which estends a distance of about 0.070 inch from the centra'l island 15 and along the bisector of a respective corner. The ascending corner chip control surface 61 adds strength to the nose or corner area and enhance~ the strain level to impart curl to a chip with a sufficiently large radius in such a manner so as to promote breakage of the chip.
Z~
The additional corner chip control surfaces formed by the raised corner ~ottom control surface 57 extending above the raised corner bottom chip control surface 57 and around the corner include a raised corner bottom chip control surface 57.
The raised corner bottom chip control surface 57 comprises a flat surface substantially parallel to a respective face and estends from the descending control surface 34 to the ascending corner chip control surface 61. The raised corner bottom chip control surface 57 which has a width of from about 0.015 to about 0.025 and preferably about 0.0215 inch is preferably at a depth of about 0.00523 as measured from the cutting edge or about 0.0119 as measured from the island. The shallow chip control recess 59 formed in the corner area by the raised corner bottom chip control surface 57 promotes a change in the curling motion of chips to promote breakage.
The portion of the chip breaker recess 33 formed by the descending control surface 34 and the ascending control surface 36 merges with shallow chip control recess 59 in the corner or nose area of the chip breaker recess 34. The shallow chip control recess 59 is formed by the additional corner chip control surfaces which is in turn formed by the raised land 55 and raised bottom 8urface 57. The island 17 is preferably higher than the cutting edge 42 and most preferably the island is about 0.0067 inch higher than the cutting edge 42. The narrow chip breaker recess at the nose and the difference in height~ of the variou8 chip breaker control surfaces enhance the chip breaking effect at low ranges of feed and depth of Cut.
Intermediate the corners, a raised intermediate land 81 5~
extends outwardly from the island 17 into the chip breaker recess 34. The raised intermediate land 81 which has a triangular shape includes an intermediate ascending control surface 83 extending closely adjacent the descending control surface 34 and merging with the ascending control surface 36.
The intermediate ascending control surface 83 extends upwardly at an angle of from about 30 to about 50 degrees, preferable at an angle of about 40 degrees.
According to an embodiment illustrated in Figures 5 to 7, the first descending control surface 51 is planar as previously described with reference to the embodiments shown in Figures 1 to 4. The second descending control surface 53 e~tends inwardly from the first descending control surface 51 at a steep angle. As illustrated, a concave portion of the second surface 53 may be formed by an arc with the cord of the arc being at an angle of about 27 degrees to the bottom flat control surface 71 or the island 17. In Figure 7, the concave portion of the second descending control surface 53 is formed by a radius of about 0.0431 inch. The bottom flat control surface 71 is parallel to the respecti~e face or island 17 and e~tends to the ascending control surface 36. The ascending control surface 36 is a straight planar backwall joining the bottom flat control ~urface 71 to the island 17.
The embodiment illustrated in Figure 6, includes the additional corner chip control surfaces formed by a raised land 55 and includes an ascending corner chip control surface 61 e~tending upwardly at an angle of about 40 degrees from the raised corner bottom chip control surface 57. The ascending corner chip control surface 61 follows the contours of the cutting edges 41 and 42 forming a 60 degree angle at corner 25 2~
of the insert 15. The raised land 55 includes a pair of leg portions which extend raised land 55 outwardly along the bisector of a respective corner 2S.
According to the preferred embodiment of the invention illustrated in Figures 8 to 10, the raised corner bottom control surface 57 which has a width of about 0.029 inch includes a projection 91 directly adjacent the ascending chip control surface 36. The projection 91 as illustrated in the drawings has a conves shape in the form of a ridge. The purpose of the raised projection is to promote the lifting of chips to enhance chip breakage and strengthen the nose or corners. The width of the raised projection in the most preferred embodiment is about 0.0089 inch.
According to the preferred embodiment of the invention illustrated in Figures 11 to 13, the descending control surface 34 comprises a first and second descending control surfaces 51 and 53 as described with reference to Figure 13. The bottom of the chip breaker recess includes a concave control surface 93 e~tending to the flat bottom control surface 71. The concave portion having a radius of about 0.0610 joins the flat portion having a width of about 0.037 inch which in turn joins the a~cending control surface 36. The lowermost portion of the bottom control surface 71 is at a distance of about 0.01 to about 0.25 from the island or preferably a distance of about 0.0188. This latter distance corresponds with a distance of 0.0122 inch from the cutting edge 42. The width of the flat bottom control surface 71 is shown as being about 0.0126 inch.
The ascending control surface 36 which is a straight flat planar backwall joining the bottom control surface 71 to the island 17 ha8 an angle of from about 30 to about 50 degrees, preferable an angle of about 40 degrees.
As shown in Figure 12, the ascending corner chip control surface 61 includes a first ascending corner chip control surface 95 joining a second ascending corner chip control surface 97. The first surface 95 extends upwardly at the angle previously described with respect to the ascending corner chip control surface 61 and the second surface 97 extends upwardly at an angle of from about 3 to about 9 degrees, preferable at an angle of about 6 degrees frsm the first corner ascending control surface 95 to the top of the raised land 55 which is at an elevation comparable to the island 17. The ascending corner chip control surface 61 is present at the corner nose section of the insert in the form of a triangular shaped head. The raised corner bottom chip control surface 57 which has a width of from about 0.015 to about 0.025 and preferably about 0.0215 inch is preferably at a depth of about 0.0052 as measured ~rom the cutting edge 42 or about 0.0119 as measured from the island 17.
The island 17 is preferably higher than the cutting edge 42 as previously discussed. The junction 99 of the island 17 and the ascending chip control surface 36 tapers inwardly away from a respective corner 25 and the cutting edges 41 and 42 toward the center of the insert 15 so that the chip breaker recess 33 becomes wider toward the center of the insert 15. The inward taper is such that the angle between adjacent junctions 99, 101 is rom about 5 to about 20 degrees less than the included angle of the corner. In Figure 11, the included angle is shown as being about 52 degrees.
While there have been shown and described what are at present believed to be the preferred embodiments of the present ~oo~
invention, it will be obvious to those of ordinary skill in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
U.S. Patent 4,685,844 to McCreery describes an indesable and invertible cutting insert having cutting edges and a positive rake surface which appears conves when viewed in cross section.
U.S. Patent 4,214,845 to Yoshikatsu describes a polygonal throw away insert including an insert body having two opposite, parallel major surfaces and a plurality of sides. A cutting edge is formed along a line where each of the sides joins each of the surfaces. A ramp estends from each cutting edge downwardly towards the center of at least one of the two major surface~ of the insert body. A pair of first chip breaking projsctions are provided on the ramp adjacent each corner of the insert body in a symmetrical relationship with respective to the bisector of the corner and a second chip breaking projection is provided on the bisector behind the first projection~.
U.S. Patent 3,815,192 to Ohtsu describes a polygonal throw away in8ert to be detachably mounted in a tool holder having a (~ jt~
_3_ D-88-2-156 plurality of cutting edges on one major surface of the insert body along the edges of all the sides thereof and a plurality of projection rows provided on said major surface along and spaced from the cutting edges so as to form chip breakers.
Adjacent projections in each projection row define chip curling zones therebetween.
Summary of the Invention It is an object of the present invention to provide a chip form for an insert which promotes breaking strain for thin and narrow chips over a wide range of operations which are encountered in different metal removal industries.
It is a further object of the present invention to configure the chip breaker so a ductile chip breaks at moderate to high speeds and low ranges of feed and depth of cut.
It is a further object of the present invention to lower the cutting forces while generating less wear and achieve improved tool life.
It i~ a further object of the present invention to achieve durable tool life and good to e~cellent resistance to crater and edge build-up.
It i8 an object of the present invention to obviate one or more disadvantage~ of the prior art.
Other and further objects of the present invention will be apparent to one of ordinary skill in the art from reading of the detailed 8pecification.
2~S5~4 _4_ D-88-2-156 With the insert of the present invention, the chip breaker recess is configured to achieve enhanced chip breaking at feed rates on the order of about 0.005 to about 0.200 inch per revolution and depth of cut on the order of from about 0.010 to about 0.125. The chip which is formed during cutting is influenced by the configuration of the control surfaces forming the chip breaker. Typically, a chip flowing over the cutting edge, first encounters a descending control surface. The flowing chip nest encounters the bottom of the chip breaker recess followed by an ascending control surface which directs the chip upwardly and outwardly. In the present invention, the chip breaker recess incorporates additional corner chip control surfaces formed by a raised land estending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surface. The additional corner chip control surfaces form a shallow groove which enhances the plastic deformation of chips at light depths of cut less than 0.05 inch.
In accordance with the present invention, an indesable cutting insert of the type having a corner radius and a corner angle adapted for finishing operations comprises a pair of substantially parallel spaced apart faces and at least one peripheral side surface being substantially normal to said faces. A pair of straight cutting edge estend away from the corner at the juncture of the peripheral side surface and a plane positioned closely adjacent and below the juncture of a respective face. To break the chips formed during cutting, a Chip breaker recess estents rearwardly and along the cutting edges. The chip breaker recess includes a descending control ~urface leading to the bottom of the recess followed by an 2C~ 8~
ascending control surface. The descending control surface comprises a first and second planar descending control surface with the first surface beina at a shallow angle and the second surface being at a steep angle. The ascending surface directs the chip upwardly toward a central island formed within the plane of a respective face and away from the insert and the cutting edge. In the present invention, the chip breaker recess incorporates additional shallow chip control recess formed by a raised land estending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surace extending above the bottom of the main chip breaker recess and around the corner. The additional chip control surfaces forming the shallow recess include an ascending corner chip control surface e~tending upwardly from the raised corner bottom control surface at a relatively steep angle. The recess is configured to change the curling motion of the chip at various depths of cut to enhance the chip breaking forces.
Detailed DescriDtion of the Drawinas Figure 1 is a top-elevational view of an embodiment of an insert of the present invention.
Fiqure 2 is a partial sectional view of a corner chip breaker along 8ection 2-2 of Figure l;
Figure 3 is a partial sectional view of a chip breaker along a portion of section 3-3 of Figure l;
Figure 4 i8 a detailed sectional view of a raised land along section 4-4 of Figure l;
ZC1~ 58~-i Figure S is a top-elevational view of another embodiment of an insert of the present invention.
Figure 6 is a partial sectional view of a corner chip breaker along section 6-6 of Figure 5;
Figure 7 is a partial sectional view of a chip breaker along a portion of section 7-7 of Figure 5;
Figure 8 is a top-elevational view of another embodiment of an insert of the present invention.
Figure 9 is a partial sectional view of a corner chip breaker along section 9-9 of Figure 8;
Figure 10 i~ a partial sectional view of a chip breaker along a portion of section 10-10 of Figure 8;
Figure 11 i~ a top-elevational view of another embodiment of an insert of the present invention.
Figure 12 is a partial sectional view of a corner chip breaker along section 12-12 of Figure 11;
Figure 13 i~ a partial sectional view of a chip breaker along a portion of ~ection 13-13 of Figure 11.
h~Lh ~ of the Preferred Embodiment As shown in Figure 1, the cutting insert 15 includes a pair of s~aced parallel faces with peripheral side sureace~ 21-23 5~ ~
positioned therebetween. One face which forms an island is shown at 17 while the other face is not shown in the figure.
The peripheral side surfaces 21-23 which lie in respective planes substantially normal to the parallel faces form straight cutting edges 41-43 which substantially lie in a cutting plane positioned just below a respective face 17. The side surfaces 21 to 23 form adjacent side surfaces which merge at the rounded corners 25-27 of the insert 15. The rounded cutting corners 25-27 for finishing operations generally a have a radius of less than 0.04, preferably less than 0.03 and more preferably less than about 0.015 inch for enhancing the accuracy of finishing operations. Pairs of adjacent side surfaces, for e~ample 21 and 22, have an included angle of less than 90 degrees to obtain the desired clearance desired for finishing operations. Polygonal shapes such as triangular or rhomboidal are preferred for obtaining inde-ability. The side clearance angle at the corners is preferably less than 90 degrees. This angle i8 the included angle between respctive side surfaces and i8 preferably less than 85 degrees.
For mounting purposes, the insert lS may be provided with a opening 35 estending entirely through the insert 15 from the one face 17 to the other face. In the interior region , the opening 35 has ~traight sides e~tending in a direction normal to the faces. In the region adjacent a respective face, the opening bevels outwardly for accommodating the head of a threaded screw which can be used to provide secure attachment of the insert 15 to a tool.
For purposes of the following discussion, inwardly or the inward direction is toward the center of the insert while outwardly or the outward direction is in a direction away from 20~3~ 8 ;~
the center of the insert. with reference to chip f low over a cutting edge, the radial direction is generally perpendicular to the cutting edge while the axial direction is parallel to the cutting edge. Unless specifically mentioned otherwise, the various angles referred to are with reference to the plane of an adjacent face surface. Also, dimensions are in inchs unless otherwise specified.
The cutting edges 41-43 may be slightly beveled or rounded to reduce cracking when the edge impacts the work to be cut.
To break the chips formed during cutting, a chip breaker recess 33 estents rearwardly away from and along the cutting edges 41-43 around the periphery of the insert lS. The chip breaker recess 33 includes a descending control surface 34 leading to the bottom of the chip breaker recess 33 followed by an ascendinq control surface 36 leading to the central island 17.
The ascending control surface 36 directs the chip upwardly toward a respective one of the parallel faces and away from the insert 15 and the cutting edge.
As generally illustrated in the drawings, the descending control surface 34 comprises a first descending control surface 51 and a second de wending control surface 53 with the first surface being at a shallow angle and the second surface being at a steep angle. The raised land 55 estending outwardly toward a corner 25 from the central island 17 along a bisector of a respective corner 25 and a raised corner bottom control surfac'e 57 estending above the bottom of the remaining portion of chip breaker rece8s 33 and around the corner 25 form an additional shallow chip control recess 59. The shallow recess 59 is formed by additional chip control surfaces which include an ascending corner chip control surface 61 estending upwardly ~o~
_9- D-88-2-156 from the raised corner bottom colltrol surface 57 to the raised land 55 at a relatively steep angle. In the corner area, a descending corner chip control surface which extends downwardly from the cutting edge 42 at the corner 25 is formed by a portion of the descending control surface 34. The shallow recess 59 merges with a remaining portion of the chip breaker recess 33 and is configured to change the curling motion of the chip at light depths of cut to enhance the chip breaking forces. Since the corners of the insert are identical in construction, it is believed that a description of only one, as set forth above and below, will suffice.
The first descending control surface 51 is planar and estends inwardly from the cutting edge 42 at a shallow angle to add strength to the cutting edge 42. The angle is from about 9 to about 15 degrees and preferably at about 12 degrees as measured wi~h reference to the island 36. The second descending control surface 53 is planar and e~tends inwardly from the first descending control surface 51 to the bottom of the chip breaker recess 33 at a steep angle of from about 22 to about 32 degrees and preferably at about 27 degrees The first descending control surface 51 at a shallow angle lifts the chip at low ranges of feed and depth of cut. At higher ranges, the steeper second descending control surface 53 interrupts the continuou~ motion of the chip to promote curling. The width of the descending control surface 34 is from about 0.015 to about 0.04 inch, preferably about 0.0250. In the corner area, the width of the descending control surface 34 is from about 0.015 to about 0.02 inch, preferably about 0.0185. The bottom of the chip breaker recess 33 along the main portion of the chip breaker includes a bottom flat control surface 71 parallel to the re~pective face or island 17 at a distance of about 0.01 to ~o~
-lO- D-88-2-156 about 0.02 from the island or preferably a distance of about 0.0152. The width of the bottom flat control surface 71 is from about 0.01 to about 0.015 and preferably about 0.0126 inch. The ascending control surface 36 is curved concave backwall joining the bottom flat control surface 71 to the island 17 and having a radius of from about O.OS to about 0.1 inch and preferably about 0.075 inch.
The ascending corner chip control surface 61 has a width of from about 0.015 to about 0.03 and preferably about 0.023 inch as measured along a bisector of a respective corner. The ascending corner chip control surface 61 comprises a first ascending corner chip control surface 75 and second ascending corner chip control surface 77. The first surface 75 e~tends upwardly from the raised corner bottom chip control surface 57 at a relatively steep angle of from about 33 to about 47 degrees, preferable at an angle of about 40 degrees. The second surface 77 estends upwardly from the first surface 75 to the raised land 55 formed as part of the island 17 at a less steep angle of from about lS to about 31 degrees, preferable at an angle of about 23 degrees. At the corner most position, the first surface 75 joins the raised corner bottom chip control surface 57 while the rearward portion joins the ascending control surface 34. The ascending corner chip control surface 61 is present at the corner nose section of the insert 15 in the form of a pear shaped head which estends a distance of about 0.070 inch from the centra'l island 15 and along the bisector of a respective corner. The ascending corner chip control surface 61 adds strength to the nose or corner area and enhance~ the strain level to impart curl to a chip with a sufficiently large radius in such a manner so as to promote breakage of the chip.
Z~
The additional corner chip control surfaces formed by the raised corner ~ottom control surface 57 extending above the raised corner bottom chip control surface 57 and around the corner include a raised corner bottom chip control surface 57.
The raised corner bottom chip control surface 57 comprises a flat surface substantially parallel to a respective face and estends from the descending control surface 34 to the ascending corner chip control surface 61. The raised corner bottom chip control surface 57 which has a width of from about 0.015 to about 0.025 and preferably about 0.0215 inch is preferably at a depth of about 0.00523 as measured from the cutting edge or about 0.0119 as measured from the island. The shallow chip control recess 59 formed in the corner area by the raised corner bottom chip control surface 57 promotes a change in the curling motion of chips to promote breakage.
The portion of the chip breaker recess 33 formed by the descending control surface 34 and the ascending control surface 36 merges with shallow chip control recess 59 in the corner or nose area of the chip breaker recess 34. The shallow chip control recess 59 is formed by the additional corner chip control surfaces which is in turn formed by the raised land 55 and raised bottom 8urface 57. The island 17 is preferably higher than the cutting edge 42 and most preferably the island is about 0.0067 inch higher than the cutting edge 42. The narrow chip breaker recess at the nose and the difference in height~ of the variou8 chip breaker control surfaces enhance the chip breaking effect at low ranges of feed and depth of Cut.
Intermediate the corners, a raised intermediate land 81 5~
extends outwardly from the island 17 into the chip breaker recess 34. The raised intermediate land 81 which has a triangular shape includes an intermediate ascending control surface 83 extending closely adjacent the descending control surface 34 and merging with the ascending control surface 36.
The intermediate ascending control surface 83 extends upwardly at an angle of from about 30 to about 50 degrees, preferable at an angle of about 40 degrees.
According to an embodiment illustrated in Figures 5 to 7, the first descending control surface 51 is planar as previously described with reference to the embodiments shown in Figures 1 to 4. The second descending control surface 53 e~tends inwardly from the first descending control surface 51 at a steep angle. As illustrated, a concave portion of the second surface 53 may be formed by an arc with the cord of the arc being at an angle of about 27 degrees to the bottom flat control surface 71 or the island 17. In Figure 7, the concave portion of the second descending control surface 53 is formed by a radius of about 0.0431 inch. The bottom flat control surface 71 is parallel to the respecti~e face or island 17 and e~tends to the ascending control surface 36. The ascending control surface 36 is a straight planar backwall joining the bottom flat control ~urface 71 to the island 17.
The embodiment illustrated in Figure 6, includes the additional corner chip control surfaces formed by a raised land 55 and includes an ascending corner chip control surface 61 e~tending upwardly at an angle of about 40 degrees from the raised corner bottom chip control surface 57. The ascending corner chip control surface 61 follows the contours of the cutting edges 41 and 42 forming a 60 degree angle at corner 25 2~
of the insert 15. The raised land 55 includes a pair of leg portions which extend raised land 55 outwardly along the bisector of a respective corner 2S.
According to the preferred embodiment of the invention illustrated in Figures 8 to 10, the raised corner bottom control surface 57 which has a width of about 0.029 inch includes a projection 91 directly adjacent the ascending chip control surface 36. The projection 91 as illustrated in the drawings has a conves shape in the form of a ridge. The purpose of the raised projection is to promote the lifting of chips to enhance chip breakage and strengthen the nose or corners. The width of the raised projection in the most preferred embodiment is about 0.0089 inch.
According to the preferred embodiment of the invention illustrated in Figures 11 to 13, the descending control surface 34 comprises a first and second descending control surfaces 51 and 53 as described with reference to Figure 13. The bottom of the chip breaker recess includes a concave control surface 93 e~tending to the flat bottom control surface 71. The concave portion having a radius of about 0.0610 joins the flat portion having a width of about 0.037 inch which in turn joins the a~cending control surface 36. The lowermost portion of the bottom control surface 71 is at a distance of about 0.01 to about 0.25 from the island or preferably a distance of about 0.0188. This latter distance corresponds with a distance of 0.0122 inch from the cutting edge 42. The width of the flat bottom control surface 71 is shown as being about 0.0126 inch.
The ascending control surface 36 which is a straight flat planar backwall joining the bottom control surface 71 to the island 17 ha8 an angle of from about 30 to about 50 degrees, preferable an angle of about 40 degrees.
As shown in Figure 12, the ascending corner chip control surface 61 includes a first ascending corner chip control surface 95 joining a second ascending corner chip control surface 97. The first surface 95 extends upwardly at the angle previously described with respect to the ascending corner chip control surface 61 and the second surface 97 extends upwardly at an angle of from about 3 to about 9 degrees, preferable at an angle of about 6 degrees frsm the first corner ascending control surface 95 to the top of the raised land 55 which is at an elevation comparable to the island 17. The ascending corner chip control surface 61 is present at the corner nose section of the insert in the form of a triangular shaped head. The raised corner bottom chip control surface 57 which has a width of from about 0.015 to about 0.025 and preferably about 0.0215 inch is preferably at a depth of about 0.0052 as measured ~rom the cutting edge 42 or about 0.0119 as measured from the island 17.
The island 17 is preferably higher than the cutting edge 42 as previously discussed. The junction 99 of the island 17 and the ascending chip control surface 36 tapers inwardly away from a respective corner 25 and the cutting edges 41 and 42 toward the center of the insert 15 so that the chip breaker recess 33 becomes wider toward the center of the insert 15. The inward taper is such that the angle between adjacent junctions 99, 101 is rom about 5 to about 20 degrees less than the included angle of the corner. In Figure 11, the included angle is shown as being about 52 degrees.
While there have been shown and described what are at present believed to be the preferred embodiments of the present ~oo~
invention, it will be obvious to those of ordinary skill in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (36)
1. A indexable cutting insert of the type having a corner radius and a corner angle adapted for finishing operations comprises a pair of substantially parallel spaced apart faces and a plurality of peripheral side surfaces being substantially normal to said faces, a plurality of straight cutting edges positioned in a plane closely adjacent and below the plane of a respective face, adjacent pairs of cutting edges forming corners and extending away from corners at the junction of said plane and said respective peripheral side surfaces, a chip breaker recess extending along a respective cutting edge and including a descending control surface and an ascending control surface, said descending control surface comprises a first and second planar descending control surfaces, said first planar descending control surface being at a shallow angle and said second planar descending control surface being at a steep angle, said chip breaker recess comprising a shallow corner chip control recess formed by said descending control surface and additional chip control surfaces, said additional chip control surfaces being formed by a raised land extending outwardly toward a corner from the central island along a bisector of a respective corner and a raised bottom surface extending around said corner above the bottom of a remaining portion of said chip breaker recess, said raised land including an ascending corner chip control surface extending upwardly from the raised corner bottom control surface at a relatively steep angle for enhancing the curling motion of the chips at light depths of cut to enhance the chip breaking forces.
2. An indexable cutting insert according to claim 1 wherein said faces form respective islands.
3. An indexable cutting insert according to claim 1 wherein said rounded cutting corners preferable have a radius of less than about 0.015 inche for enhancing the accuracy of finishing operations
4. An indexable cutting insert according to claim 1 wherein said insert has a triangular or rhomboidal shape with a side clearance angles less than 85 degrees.
5. An indexable cutting insert according to claim 1 wherein said cutting edges have a slightly beveled or rounded edge for reducing cracking when the edge impacts the work to be cut
6. An indexable cutting insert according to claim 1 wherein said chip breaker recess extents rearwardly away from and along said cutting edges entirely around the periphery of said insert
7. An indexable cutting insert according to claim 1 wherein said first descending control surface extends inwardly from the cutting edge at a shallow angle from about 9 to about 15 degrees.
8. An indexable cutting insert according to claim 1 wherein said second descending control surface extends inwardly from the first descending control surface to the bottom of the chip breaker recess at a steep angle of from about 22 to about 33 degrees.
9. An indexable cutting insert according to claim 8 wherein said width of the descending control surface is from about 0.015 to about 0.04 inch.
10. An indexable cutting insert according to claim 1 wherein said bottom flat control surface has a width of from about 0.01 to about 0.02.
11. An indexable cutting insert according to claim 1 wherein said ascending control surface is a curved concave backwall joining.
12. An indexable cutting insert according to claim 11 wherein said ascending corner chip control surface has a width of from about 0.015 to about 0.03.
13. An indexable cutting insert according to claim 1 wherein said ascending corner chip control surface comprises a first ascending corner chip control surface and second ascending corner chip control surface, said first surface ascending corner chip control surface extends upwardly from the raised corner bottom chip control surface at a relatively steep angle of from about 33 to about 47 degrees, said second ascending corner chip control surface extends upwardly from the first surface to said raised at a less steep angle of about 15 to about 23 degrees.
14. An indesable cutting insert according to claim 13 wherein said first ascending corner chip control surface estends upwardly from the raised corner bottom chip control surface at a relatively steep angle of about 40 degrees.
15. An indexable cutting insert according to claim 13 wherein said second ascending corner chip control surface extends upwardly from the first surface to said raised at a less steep angle of about 23 degrees.
16. An indexable cutting insert according to claim 1 wherein said the first descending surface joins said raised corner bottom chip control surface adjacent a respective corner.
17. An indexable cutting insert according to claim 2 wherein said ascending corner chip control surface extents from a respective island and along the bisector of a respective corner.
18. An indexable cutting insert according to claim 17 wherein said ascending corner chip control surface is in the shape of a pear shaped head which extends a distance of about 0.070 inch from the central island and along the bisector of a respective corner.
19. An indexable cutting insert according to claim 1 wherein said raised corner bottom chip control surface comprises a flat surface substantially parallel to a respective face and extends from the descending control surface to the ascending corner chip control surface.
20. An indexable cutting insert according to claim 2 wherein said raised corner bottom chip control surface has a width of from about 0.015 to about 0.025.
21. An indexable cutting insert according to claim 1 wherein said descending control surface and said ascending control surface merges with said shallow chip control recess in the corner area of the chip breaker recess.
22. An indexable cutting insert according to claim 1 wherein said a raised intermediate land extends outwardly from the island into the chip breaker recess intermediate the corners.
23. An indexable cutting insert according to claim 22 wherein said raised intermediate land has a triangular shape and includes an intermediate ascending control surface extending closely adjacent to said descending control surface and merging with the said ascending control surface.
24. An indexable cutting insert according to claim 22 wherein said intermediate ascending control surface extends upwardly at an angle of from about 30 to about 40 degrees.
25. An indexable cutting insert according to claim 1 wherein said ascending corner chip control surface follows the contours of said cutting edges.
26. An indexable cutting insert according to claim 25 wherein said ascending corner chip control surface forms a 60 degree angle adjacent respective corners of said insert.
27. An indexable cutting insert according to claim 1 wherein said raised land includes a pair of leg portions which extend said raised land outwardly along the bisector of a respective corner.
28. An indexable cutting insert according to claim 1 wherein said raised corner bottom control surface includes a projection directly adjacent the ascending chip control surface.
29. An indexable cutting insert according to claim 28 wherein said raised corner bottom control surface has a width of from about 0.015 to about 0.025.
30. An indexable cutting insert according to claim 28 wherein said projection has a convex shape in the form of a ridge.
31. An indexable cutting insert according to claim 1 wherein said bottom of the chip breaker recess includes a concave control surface extending to said flat bottom control surface.
32. An indexable cutting insert according to claim 22 wherein said ascending control surface comprises a straight flat planar backwall joining said bottom control surface to said island at an angle of from about 30 to about 50 degrees.
33. An indexable cutting insert according to claim 1 wherein said the ascending corner chip control surface includes a first ascending corner chip control surface joining a second ascending corner chip control surface, said first ascending corner chip control surface extends upwardly at the angle of from about 30 to about 50 and said second ascending corner chip control surface extends upwardly at an angle of from about 3 to about 9 degrees.
34. An indexable cutting insert according to claim 1 wherein said ascending corner chip control surface 61 is present adjacent a respective corner of the insert in the form of a triangular shaped head.
35. An indexable cutting insert according to claim 34 wherein said said island and said ascending chip control surface form a junction, said junction tapers inwardly away from a respective corner and the cutting edges toward the center of the insert whereby said chip breaker recess becomes wider toward the center of the insert.
36. An indexable cutting insert according to claim 35 wherein said inward taper is at an angle between adjacent junctions from about 5 to about 20 degrees less than the included angle at a respective corner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/288,493 US5000626A (en) | 1988-12-22 | 1988-12-22 | Cutting insert for low ranges of feed and depth of cut |
| US07/288,493 | 1988-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2005584A1 true CA2005584A1 (en) | 1990-06-22 |
Family
ID=23107353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002005584A Abandoned CA2005584A1 (en) | 1988-12-22 | 1989-12-14 | Cutting insert for low ranges of feed and depth of cut |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5000626A (en) |
| EP (1) | EP0374800A3 (en) |
| CA (1) | CA2005584A1 (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082401A (en) * | 1990-12-18 | 1992-01-21 | Kennametal Inc. | Cutting insert for light feed rate |
| US5192171A (en) * | 1991-01-07 | 1993-03-09 | Gte Valenite Corporation | Chip control insert |
| US5122017A (en) † | 1991-02-19 | 1992-06-16 | Kennametal Inc. | Cutting insert with chip control |
| US5222843A (en) * | 1992-06-22 | 1993-06-29 | Valenite Inc. | Insert for light feed, light depth of cut |
| SE508452C2 (en) * | 1992-07-02 | 1998-10-05 | Sandvik Ab | Cuts for chip separating processing |
| US5230591A (en) * | 1992-08-10 | 1993-07-27 | Gte Valenite Corporation | Insert for light feed, light depth of cut |
| US5324144A (en) * | 1992-09-21 | 1994-06-28 | Valenite Inc. | High sheer, ultra light duty insert |
| US5249894A (en) * | 1992-12-07 | 1993-10-05 | Gte Valenite Corporation | High sheer, ultra light duty insert |
| US5456557A (en) * | 1994-08-09 | 1995-10-10 | Valenite Inc. | Cutting insert |
| EP0879111B1 (en) * | 1996-01-31 | 2000-11-22 | Widia GmbH | Cutter insert for roughing and finishing |
| DE19627990C5 (en) * | 1996-07-11 | 2004-07-01 | MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG | Cutting insert designed as a polygon |
| US6238151B1 (en) * | 1998-09-28 | 2001-05-29 | Mitsubishi Materials Corporation | Drilling tool and throw-away tip for use in drilling work |
| JP4155838B2 (en) * | 2003-02-14 | 2008-09-24 | 住友電工ハードメタル株式会社 | Replaceable blade tip and cutting tool using the same |
| US7438324B2 (en) | 2003-06-30 | 2008-10-21 | Keiper Michael C | Method and components for repairing broken conduit extending from concrete foundations |
| JP5092865B2 (en) * | 2008-04-17 | 2012-12-05 | 株式会社タンガロイ | Throwaway tip |
| JP5206905B2 (en) * | 2010-05-11 | 2013-06-12 | 株式会社タンガロイ | Cutting insert |
| SE535166C2 (en) | 2010-08-25 | 2012-05-08 | Sandvik Intellectual Property | Double-sided, indexable lathe cutter with pointed chip angle |
| JP6096895B2 (en) * | 2013-05-28 | 2017-03-15 | 京セラ株式会社 | Cutting insert, cutting tool, and method of manufacturing a cut product using the same |
| US10195673B2 (en) * | 2015-12-11 | 2019-02-05 | Kennametal Inc. | Ceramic cutting insert and method of making same |
| EP3260225B1 (en) * | 2016-06-20 | 2022-11-30 | Sandvik Intellectual Property AB | Turning insert |
| CN113260474A (en) * | 2019-03-07 | 2021-08-13 | 硬质金属工具厂保罗霍恩有限公司 | Cutting insert and tool for machining a workpiece |
| JP7381599B2 (en) * | 2019-11-13 | 2023-11-15 | 京セラ株式会社 | Manufacturing method for cutting inserts, cutting tools, and cut products |
| DE102020117101A1 (en) | 2020-06-29 | 2021-12-30 | Kennametal Inc. | Cutting insert and cutting tool |
| CN114309682A (en) | 2020-09-30 | 2022-04-12 | 肯纳金属公司 | Cutting insert |
| EP4066973A1 (en) * | 2021-03-31 | 2022-10-05 | Pramet Tools, S.R.O. | Double-sided tangential cutting insert |
| JP2024015617A (en) * | 2022-07-25 | 2024-02-06 | 三菱マテリアル株式会社 | Cutting tools |
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| 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. |
| US3399442A (en) * | 1966-09-08 | 1968-09-03 | Kennametal Inc | Cutting insert |
| US3733644A (en) * | 1971-07-16 | 1973-05-22 | Deering Milliken Res Corp | Scraper member for drafting system |
| SE349758B (en) * | 1971-10-27 | 1972-10-09 | Sandvik Ab | |
| SE349760C (en) * | 1971-10-27 | 1974-03-11 | Sandvik Ab | Cuts for chip cutting processing |
| US3733664A (en) * | 1971-11-23 | 1973-05-22 | Kennametal Inc | Cutting insert |
| SE354593C (en) * | 1972-05-17 | 1975-01-20 | Sandvik Ab | |
| US3841785A (en) * | 1972-06-09 | 1974-10-15 | K Werther | Boring bar |
| SE361609B (en) * | 1973-01-08 | 1973-11-12 | Sandvik Ab | |
| US3885281A (en) * | 1974-06-10 | 1975-05-27 | Iscar Ltd | Cutting insert with chip control |
| CH590099A5 (en) * | 1975-01-14 | 1977-07-29 | Stellram Sa | |
| DE2544991C2 (en) * | 1975-10-08 | 1981-06-04 | Hertel, Karl, 8500 Nürnberg | Cutting insert for machining |
| US4056871A (en) * | 1976-10-21 | 1977-11-08 | Kennametal Inc. | Cutting insert |
| SE7710434L (en) * | 1977-09-19 | 1979-03-20 | Sandvik Ab | HAPPENS FOR SPANISH WORKING |
| JPS5464384U (en) * | 1977-10-17 | 1979-05-07 | ||
| US4218160A (en) * | 1978-09-15 | 1980-08-19 | Fansteel Inc. | Heavy duty cutting insert |
| US4189265A (en) * | 1978-09-15 | 1980-02-19 | Fansteel Inc. | Positive chip control insert |
| IL58006A (en) * | 1979-08-08 | 1983-02-23 | Iscar Ltd | Cutting insert with chip control means |
| IL58861A (en) * | 1979-12-04 | 1981-11-30 | Iscar Ltd | Interchangeable insert with a chip breaker |
| US4334808A (en) * | 1980-07-07 | 1982-06-15 | Gte Products Corporation | Cutting insert |
| US4340324A (en) * | 1980-08-28 | 1982-07-20 | Kennametal Inc. | Cutting insert |
| US4318645A (en) * | 1980-09-02 | 1982-03-09 | Kennametal Inc. | Cutting insert |
| US4335984A (en) * | 1980-11-05 | 1982-06-22 | Raymond Zweekly | Metalcutting insert for roughing and finishing |
| US4359300A (en) * | 1980-12-29 | 1982-11-16 | General Electric Co. | Cutting insert with improved chip control |
| CA1194684A (en) * | 1981-01-30 | 1985-10-08 | Kennametal Inc. | Cutting insert |
| US4411565A (en) * | 1981-05-08 | 1983-10-25 | General Electric Company | Finishing insert with improved chip control |
| AT372320B (en) * | 1981-09-09 | 1983-09-26 | Plansee Metallwerk | CUTTING TOOL, IN PARTICULAR INSERT |
| USRE32636E (en) * | 1982-09-30 | 1988-04-05 | Gte Valenite Corporation | Cutting insert with chip control |
| US4507024A (en) * | 1982-09-30 | 1985-03-26 | Gte Valeron Corporation | Cutting insert with chip control |
| JPS6112611U (en) * | 1984-06-28 | 1986-01-24 | 住友電気工業株式会社 | Throwaway tip |
| US4626141A (en) * | 1985-01-23 | 1986-12-02 | Gte Valeron Corporation | Chip control insert |
| US4705434A (en) * | 1986-12-22 | 1987-11-10 | Gte Valenite | Scalloped polygonal cutting insert |
| US4787784A (en) * | 1987-08-03 | 1988-11-29 | Gte Valenite Corporation | Polygonal cutting insert |
| US4859112A (en) * | 1988-03-03 | 1989-08-22 | Toshiaki Nakayama | Device for joining frame members for picture frame |
-
1988
- 1988-12-22 US US07/288,493 patent/US5000626A/en not_active Expired - Fee Related
-
1989
- 1989-12-14 CA CA002005584A patent/CA2005584A1/en not_active Abandoned
- 1989-12-18 EP EP19890123399 patent/EP0374800A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US5000626A (en) | 1991-03-19 |
| EP0374800A2 (en) | 1990-06-27 |
| EP0374800A3 (en) | 1991-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |