CN109365844B - Cutting blade and cutting tool for machining inner hole - Google Patents

Cutting blade and cutting tool for machining inner hole Download PDF

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Publication number
CN109365844B
CN109365844B CN201811444619.6A CN201811444619A CN109365844B CN 109365844 B CN109365844 B CN 109365844B CN 201811444619 A CN201811444619 A CN 201811444619A CN 109365844 B CN109365844 B CN 109365844B
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Prior art keywords
cutting
central axis
rear surface
locking
equal
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CN109365844A (en
Inventor
宁华林
王东海
张京
刘孙和
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Zhuzhou Cemented Carbide Cutting Tools Co Ltd
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Zhuzhou Cemented Carbide Cutting Tools Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B23B27/1614—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
    • B23B27/1622—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert characterised by having a special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/16—Supporting or bottom surfaces
    • B23B2200/161—Supporting or bottom surfaces with projections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/28—Angles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

The invention discloses a cutting blade for processing an inner hole, which comprises a front surface, a rear surface, a main side surface, a cutting part and a mounting part, wherein the main side surface, the cutting part and the mounting part are vertically connected between the front surface and the rear surface, the cutting part is positioned on the main side surface, the mounting part is positioned on the middle part of the rear surface, more than two bosses are arranged on the rear surface, the mounting bosses are circumferentially arranged along the mounting part, and the mounting part is provided with a locking surface on the peripheral wall on one side far away from the rear surface.

Description

Cutting blade and cutting tool for machining inner hole
Technical Field
The invention relates to the technical field of metal cutting machining, in particular to a cutting blade and a cutting tool for machining an inner hole.
Background
In the small diameter bore (D)min≧ 6 mm) machining, there are many types of attachment mechanisms for detachably fastening a cutting insert to a holder, most of which are designed by providing a screw counter-bore in the center of the end face of the cutting insert, and securing the insert to the holder by a screw from the end face (for example, patent CN103347630A, U.S. Pat. No. 20110200408, german patent DE29807797U1, etc.). However, the cutting insert and the cutter bar of this type have small sectional sizes, and the screw counter bore and the screw hole greatly reduce the strength of the cutting insert and the cutter bar, thereby seriously affecting the processing efficiency and the processing stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cutting blade and a cutting tool for machining an inner hole, which have high strength and accurate positioning.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a cutting blade for hole processing, includes front surface, rear surface, connects perpendicularly in leading flank, cutting portion and the installation department between front surface and rear surface, the cutting portion is located the leading flank, the installation department is located the rear surface middle part, be equipped with more than two bosss on the rear surface, the boss sets up along installation department circumference, the installation department is equipped with the locking surface on keeping away from the periphery wall of rear surface one side.
As a further improvement to the above technical solution:
the installation department includes centering post and the locking post of being connected with centering post, the locking post is kept away from rear surface one side and is set up, the locking face sets up on the periphery wall of locking post.
The radius of the locking column is R1, the radius of the centering column is R2, and R2-R1 are more than or equal to 0.1mm and less than or equal to 0.3 mm.
The centering column is symmetrical about the central axis A, and on a projection plane which is perpendicular to the locking surface and passes through the central axis A, an included angle between a projection line of the locking surface and a projection line of the central axis A is1It should satisfy: 5 degrees or less1≤10°。
The locking post is further provided with an escape surface and a transition surface, the escape surface is connected with the locking surface through the transition surface, the escape surface is perpendicular to the locking surface and passes through the projection plane of the central shaft A, and an included angle between a projection line of the locking surface and a projection line of the locking surface is2It should satisfy:2≥100°。
the boss is including the location side surface, protruding top surface and the spiral side that connect gradually, location side surface perpendicular to rear surface sets up, protruding top surface is on a parallel with the rear surface setting, the spiral side is inclined to the rear surface and along installation department spiral setting.
On a projection plane parallel to the rear surface, an included angle between a projection line of the positioning side surface and a horizontal line is alpha, and an included angle between a projection line of the spiral side surface on one side close to the rear surface and the projection line of the positioning side surface is beta 1, which should satisfy: alpha is more than 0 degree and less than 90 degrees, beta 1 is more than or equal to 60 degrees and less than or equal to 135 degrees.
On a projection plane parallel to the rear surface, an included angle between projection lines of positioning side surfaces of two adjacent bosses is gamma, and the included angle satisfies the following conditions: gamma is more than or equal to minus 5 degrees and less than or equal to 5 degrees.
The height of installation department for the rear surface is H, the height of boss for the rear surface is H, should satisfy: h is more than or equal to 2H and less than or equal to 3H.
On a projection plane parallel to the rear surface, the radius of the circumcircle of the cutting insert is R3, which satisfies: 2R2 is not less than R3 is not less than 4R 2.
The main side surface comprises an upper plane, a lower plane and a cylindrical side surface connected between the upper plane and the lower plane, and the cutting part is arranged on the cylindrical side surface.
On the projection plane that is perpendicular to the locking face and is perpendicular to center axis A, the projection line of locking face and the arbitrary planar projection line that is on a parallel with the upper plane's contained angle be theta, should satisfy: theta is more than or equal to 3 degrees and less than or equal to 8 degrees.
The cutting part comprises a main cutting edge, an auxiliary cutting edge and a tool nose circular arc positioned between the main cutting edge and the auxiliary cutting edge.
In a projection plane vertical to the front surface, the maximum vertical distance of the arc of the tool nose close to one side of the front surface relative to the front surface is f, and the following conditions are met: f is more than or equal to 0.2mm and less than or equal to 1 mm.
As a general inventive concept, the present invention further provides a cutting tool for machining an inner hole, including a tool bar, a fastening screw, and a blade, where the blade is the aforementioned cutting blade, a positioning groove for accommodating the blade is formed at a front end of the tool bar, and a threaded hole for mounting the fastening screw is formed on an outer circumferential surface of the front end of the tool bar.
As a further improvement to the above technical solution:
the positioning groove comprises a positioning hole for accommodating the mounting part and a mounting concave part for accommodating the boss.
The mounting concave part is provided with two positioning side surfaces matched with the positioning side surfaces of the boss, the radial thicknesses of the two positioning side surfaces are respectively S1 and S2, and the following requirements are met: S1-S2 is not less than 0mm and not more than 0.8 mm.
The cutter arbor is including the cutting end that is located the cutter arbor front end and the exposed core that is located the cutter arbor rear end, the constant head tank is located the cutting end, the outer peripheral face of exposed core is the exposed core side, the exposed core side is equipped with the location plane that is used for cutting tool horizontal location.
The clamping end of the cutter bar is symmetrical about a central axis D-D, the threaded hole is symmetrical about a central axis F-F, on a projection plane perpendicular to the central axis D-D, the clamping end of the cutter bar is symmetrical about an axis E-E, the axis E-E is parallel to the projection line of the central axis F-F, and the distance between the axis E-E and the projection line of the central axis F-F is L, so that the requirements that: l is more than or equal to 0.1mm and less than or equal to 0.6 mm.
The tool holder further comprises a neck connecting the cutting end and the clamping end, the maximum outer dimension of the neck in the direction of the horizontal axis C-C is D1 and the maximum outer dimension in the direction of the axis E-E is D2 on a projection plane perpendicular to the central axis D-D, and the requirements are that: d2 is more than or equal to D1.
On a projection plane parallel to the central axis D-D and passing through the central axis F-F, an included angle between the central axis F-F and the central axis D-D is such that: =90 DEG-1。
Compared with the prior art, the invention has the advantages that:
1. the back surface of the cutting blade is provided with more than two bosses, the mounting part is provided with the locking surface, the cutting blade can be locked by adopting jackscrews, the blade is simple and convenient to mount, the bosses play a role in positioning and locking, and the mounting part plays a role in centering and locking. Because the blade does not have a central hole structure, the cutter has high strength, stable positioning and compact structure, and can finish grooving with large cutting depth in a small-diameter hole.
2. According to the cutting tool, the distance L between the axis E-E of the fastening screw and the projection line of the central shaft F-F and the included angle 1 between the projection line of the blade locking surface and the projection line of the central shaft A are adopted, the threaded hole is eccentrically designed in the blade mounting process, the fastening screw is screwed, the protruding top surface of the blade is more reliably attached to the positioning side surface of the cutter bar mounting concave part, and the locking surface is pressed tightly, so that the blade is firmly locked in the positioning groove.
Drawings
Fig. 1 is a perspective view of a cutting insert according to the present invention.
Fig. 2 is a perspective view of another perspective view of the cutting insert of the present invention.
Fig. 3 is a front view of the cutting insert of the present invention.
Fig. 4 is a top view of the cutting insert of the present invention.
Fig. 5 is a left side view of the cutting insert of the present invention.
Fig. 6 is a schematic view of an assembled structure of the cutting tool of the present invention.
Fig. 7 is an exploded view of the cutting tool of the present invention.
Fig. 8 is a schematic perspective view of the knife bar of the present invention.
Fig. 9 is a partial enlarged view at P in fig. 8.
Fig. 10 is a left side view of the tool holder of the present invention.
Fig. 11 is a structural schematic view of a threaded hole and a positioning hole of the cutter bar of the invention.
The reference numerals in the figures denote:
10. a blade; 15. a front surface; 16. a rear surface; 17. a major side; 171. an upper plane; 172. a lower plane; 173. a cylindrical side surface; 25. a cutting portion; 251. a main cutting edge; 252. a secondary cutting edge; 253. the tool nose is arc-shaped; 30. an installation part; 34. a boss; 341. a positioning side surface; 343. a helical side; 342. a convex top surface; 48. a centering post; 52. a locking post; 521. a locking surface; 523. an air avoidance surface; 524. a transition surface; 60. a cutter bar; 61. positioning a groove; 62. a mounting recess; 621. positioning the side surface; 622. positioning the bottom surface; 623. positioning the helicoid; 66. positioning holes; 70. positioning the convex surface; 82. a neck portion; 83. a clamping end side surface; 90. positioning a plane; 92. a threaded hole; 95. and (5) fastening the screw.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1 to 5, the cutting insert for machining an inner hole of the present embodiment includes a front surface 15, a rear surface 16, a main side surface 17 perpendicularly connected between the front surface 15 and the rear surface 16, a cutting portion 25, and a mounting portion 30, wherein the cutting portion 25 is located on the main side surface 17, the mounting portion 30 is located on a middle portion of the rear surface 16, two or more bosses 34 are provided on the rear surface 16, the bosses 34 are symmetrically provided along a circumferential direction of the mounting portion 30, and the mounting portion 30 is provided with a locking surface 521 on an outer circumferential wall of a side away from the rear surface 16.
According to the cutting blade, the rear surface 16 is provided with more than two bosses 34, the mounting part 30 is provided with the locking surface 521, the cutting blade can be locked by adopting jackscrews, the cutting blade is simple and convenient to mount, the bosses 34 have a positioning function and a locking function, and the mounting part 30 has a centering and locking function. The blade has no central hole structure, the cutter has high strength, stable positioning and compact structure, and can finish grooving with large cutting depth in a small-diameter hole.
The mounting portion 30 includes a centering post 48 and a locking post 52 connected to the centering post 48, the locking post 52 is disposed away from the rear surface 16, and a locking surface 521 is disposed on an outer peripheral wall of the locking post 52.
In the embodiment, the radius of the locking column 52 is R1, the radius of the centering column 48 is R2, and R2-R1 are more than or equal to 0.1mm and less than or equal to 0.3 mm.
In this embodiment, the centering rod 48 is symmetrical about the central axis a, and on a projection plane perpendicular to the locking surface 521 and passing through the central axis a, an included angle between a projection line of the locking surface 521 and a projection line of the central axis a is 1, which should satisfy: 5 degrees is more than or equal to 1 degree and is less than or equal to 10 degrees, under the premise of meeting the blade locking, the structure is more compact, in the embodiment, 1=8 degrees
In this embodiment, the locking column 52 is further provided with an escape surface 523 and a transition surface 524, the escape surface 523 is connected with the locking surface 521 through the transition surface 524, on a projection plane perpendicular to the locking surface 521 and passing through the central axis a, an included angle between a projection line of the locking surface 521 and a projection line of the locking surface 521 is 2, and it should satisfy: 2 is more than or equal to 100 degrees.
The boss 34 includes a positioning side surface 341, a protrusion top surface 342, and a spiral side surface 343 connected in this order, the positioning side surface 341 being disposed perpendicular to the rear surface 16, the protrusion top surface 342 being disposed parallel to the rear surface 16, and the spiral side surface 343 being inclined to the rear surface 16 and being spirally disposed along the mounting portion 30. In the present embodiment, the number of the bosses 34 is two, and the spiral side surface 343 is connected obliquely between the rear surface 16 and the convex top surface 342, and is arranged in the circumferential direction of the rear surface 16.
In this embodiment, the number of the bosses 34 is two, and the positioning side surface 341 of one boss 34 is disposed opposite to the spiral side surface 343 of the other boss 34. On a projection plane parallel to the rear surface 16, an angle between a projection line of the positioning side surface 341 and a horizontal line is α, and an angle between a projection line of the spiral side surface 343 on a side close to the rear surface 16 and a projection line of the positioning side surface 341 is β 1, which should satisfy: alpha is more than 0 degree and less than 90 degrees, beta 1 is more than or equal to 60 degrees and less than or equal to 135 degrees. The existence of the included angle alpha can better decompose the cutting force transmitted by the blade in the cutting process, and in the embodiment, the included angle alpha =45 DEG
On a projection plane parallel to the rear surface 16, an included angle γ between projection lines of the positioning side surfaces 341 of two adjacent bosses 34 should be satisfied: -5 ° ≦ γ ≦ 5 °, which may make the positioning of the insert more reliable and avoid relative movement of the insert and the tool holder 60 in the direction of the positioning side surface 341 during machining, in this embodiment γ =1 °.
The height of the mounting portion 30 relative to the rear surface 16 is H and the height of the boss 34 relative to the rear surface 16 is H, such that: h is more than or equal to 2H and less than or equal to 3H. In a projection plane parallel to the rear surface 16, the radius of the circle circumscribed by the cutting insert is R3, which satisfies: 2R2 is not less than R3 is not less than 4R 2. The centering action of the blade centering post 48 is more reliable and the strength of the boss 34 is also satisfactory, H =2H, R3=2R2 in this embodiment.
In this embodiment, the major side surface 17 includes an upper plane 171, a lower plane 172, and a cylindrical side surface 173 connected between the upper plane 171 and the lower plane 172, and the cutting part 25 is mounted on the cylindrical side surface 173. The cutting insert is integrally formed.
In this embodiment, the upper surface 171 intersects the convex top surface 342 of one of the bosses 34, the lower surface 172 intersects the convex top surface 342 of the other boss 34, the boss 34 intersecting the upper surface 171 serves as a positioning member, and the boss 34 intersecting the lower surface 172 serves as a locking member.
The axis a-a coincides with the center line of the cylindrical side 173.
On a projection plane perpendicular to the locking surface 521 and perpendicular to the central axis a, an included angle θ between a projection line of the locking surface 521 and a plane projection line parallel to the upper plane 171 is satisfied: theta is more than or equal to 3 degrees and less than or equal to 8 degrees.
The cutting portion 25 includes a main cutting edge 251, a secondary cutting edge 252, and a nose arc 253 between the main cutting edge 251 and the secondary cutting edge 252. in the present embodiment, the nose arc 253 is tangent to the main cutting edge 251 and the secondary cutting edge 252, respectively.
In this embodiment, the maximum perpendicular distance f of the nose arc 253 on the side close to the front surface 15 relative to the front surface 15 should satisfy: f is more than or equal to 0.2mm and less than or equal to 1 mm.
As shown in fig. 6 to 11, the cutting tool for machining an inner hole according to the present invention includes a tool holder 60, a fastening screw 95, and an insert 10, wherein the insert 10 is a cutting insert according to any one of claims 1 to 14, a positioning groove 61 for receiving the insert 10 is formed at a front end of the tool holder 60, and a threaded hole 92 for mounting the fastening screw 95 is formed in an outer circumferential surface of the front end of the tool holder 60.
The insert 10 is removably retained in the positioning slot 61 by a fastening screw 95. The tightening screw 95 passes through the threaded hole 92 and presses the front end surface of the tightening screw 95 against the locking surface 521 of the insert 10, thereby locking the cutting insert 10.
The tool shank 60 may be made of one material or a plurality of materials and the blade 10 is made of a harder material. For example, the tool shank 60 may be made of steel, or of steel together with cemented carbide, and the insert 10 may be made of cemented carbide.
As shown in fig. 9, the positioning groove 61 includes a positioning hole 66 for accommodating the mounting portion 30 and a mounting recess 62 for accommodating the boss 34.
In this embodiment, the mounting recess 62 is provided with two positioning side surfaces 621 matching with the positioning side surface 341 of the boss 34, and the radial thicknesses of the two positioning side surfaces 621 are S1 and S2, respectively, which should satisfy: S1-S2 which are more than or equal to 0mm and are beneficial to improving the rigidity of the cutting tool, wherein the positioning side surface 621 with smaller radial thickness is arranged close to one side of the cutting part 25 and is contacted with the convex top surface 342 of one boss 34 of the blade 10.
In this embodiment, the mounting recesses 62 are further provided with a positioning bottom surface 622 matching with the raised top surface 342 of the boss 34, a positioning spiral surface 623 matching with the spiral side surface 343 of the boss 34, and a positioning convex surface 70 matching with the rear surface 16 of the insert 10 is further provided between the two mounting recesses 62.
The positioning side surface 621 contacts the positioning side surface 341, the positioning bottom surface 622 contacts the convex top surface 342, and the positioning convex surface 70 contacts the rear surface 16.
The inner wall of the positioning hole 66 contacts the outer peripheral surface of the centering post 48 of the insert 10, and the bottom surface of the fastening screw 95 contacts the locking surface 521 of the locking post 52 by a screw action.
In this embodiment, the tool bar 60 includes a cutting end located at the front end of the tool bar 60 and a clamping end located at the rear end of the tool bar 60, the positioning groove 61 is located at the cutting end, the outer peripheral surface of the clamping end is a clamping end side surface 83, and the clamping end side surface 83 is provided with a positioning plane 90 for horizontally positioning the cutting tool.
In this embodiment, the clamping end of the tool bar 60 is symmetrical about the central axis D-D, the threaded hole 92 is symmetrical about the central axis F-F, and on the projection plane perpendicular to the central axis D-D, the clamping end of the tool bar 60 is symmetrical about the axis E-E, the axis E-E is parallel to the projection line of the central axis F-F, and the distance between the axis E-E and the projection line of the central axis F-F is L, which should satisfy: l is more than or equal to 0.1mm and less than or equal to 0.6mm, the threaded hole 92 adopts an eccentric design, when the fastening screw 95 is screwed down, the convex top surface 342 of the blade 10 is more reliably attached to the positioning side surface 621 of the mounting concave part 62 of the cutter bar 60, the locking surface 521 is pressed tightly, and the blade 10 can be more reliably fixed in the positioning groove 61 of the cutter bar 60, wherein in the embodiment, theta =5 degrees and L =0.4 mm.
In this embodiment, on a projection plane parallel to the central axis D-D and passing through the central axis F-F, an included angle between a projection line of the central axis F-F and the central axis D-D should satisfy: =90 DEG-1。
The tool holder 60 further comprises a neck 82 connecting the cutting end and the holding end, the threaded bore 92 is located on the outer peripheral wall of the neck 82 and is located adjacent to the cutting end, the cross-section of the neck 82 is non-circular and approximately elliptical, and the neck 82 has a minimum dimension D1 and a maximum dimension D2 in a projection plane perpendicular to the central axis D-D, wherein the minimum dimension D1 coincides with the projection line C-C and the maximum dimension D2 coincides with the projection line E-E, and D2 > D1 is required for improving the rigidity of the tool.
In order to improve the shock resistance of the cutter bar 60, the section of the cutting end of the cutter bar 60 adopts a non-circular design, the size value in the direction perpendicular to the axis C-C is increased, and the radial thickness of the positioning side surface 621 arranged on one side far away from the cutting part 25 is increased, so that the strength of the cutter bar can be improved as much as possible on the premise of meeting the machining requirement.
In fig. 7, axis B-B lies in the plane of front surface 15 and is perpendicular to central axis a-a and parallel to upper and lower planes 171, 172. The center line C-C is parallel to the locating plane 90 and also parallel to the axis B-B, and the axis D-D coincides with the axis of the clamping end of the tool holder 60 and with the axis a-a, but not necessarily.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (20)

1. A cutting insert for internal bore machining, comprising a front surface (15), a rear surface (16), a major side surface (17) perpendicularly connected between the front surface (15) and the rear surface (16), a cutting portion (25) and a mounting portion (30), characterized in that: the cutting part (25) is positioned on the main side surface (17), the mounting part (30) is positioned on the middle part of the rear surface (16), more than two bosses (34) are arranged on the rear surface (16), the bosses (34) are arranged along the circumferential direction of the mounting part (30), and a locking surface (521) is arranged on the outer circumferential wall of the mounting part (30) on one side far away from the rear surface (16); the height of the mounting portion (30) relative to the rear surface (16) is H, and the height of the boss (34) relative to the rear surface (16) is H, such that: h is more than or equal to 2H and less than or equal to 3H.
2. The cutting insert according to claim 1, wherein: installation department (30) are including centering post (48) and locking post (52) be connected with centering post (48), rear surface (16) one side setting is kept away from in locking post (52), locking face (521) set up on the periphery wall of locking post (52).
3. The cutting insert as set forth in claim 2, characterized in that the locking post (52) has a radius R1, and the centering post (48) has a radius R2, 0.1mm ≦ R2-R1 ≦ 0.3 mm.
4. The cutting insert according to claim 2, wherein: the centering column (48) is symmetrical about the central axis A, and on a projection plane which is perpendicular to the locking surface (521) and passes through the central axis A, an included angle between a projection line of the locking surface (521) and a projection line of the central axis A is1It should satisfy: 5 degrees or less1≤10°。
5. The cutting insert according to claim 4, wherein: locking post (52) still are equipped with and keep away sky face (523) and transition face (524), keep away sky face (523) and be connected with locking surface (521) through transition face (524), on perpendicular to locking surface (521) and the projection plane through center axis A, the contained angle between the projection line of locking surface (521) and the projection line of keeping away sky face (523) is2It should satisfy:2≥100°。
6. the cutting insert according to any one of claims 1 to 5, wherein: boss (34) are including the location side surface (341), protruding top surface (342) and the spiral side (343) that connect gradually, location side surface (341) are perpendicular to rear surface (16) and set up, protruding top surface (342) set up in parallel with rear surface (16), spiral side (343) slope in rear surface (16) and along installation department (30) spiral setting.
7. The cutting insert according to claim 6, wherein: on a projection plane parallel to the rear surface (16), an included angle between a projection line of the positioning side surface (341) and a horizontal line is alpha, and an included angle between a projection line of the spiral side surface (343) on a side close to the rear surface (16) and a projection line of the positioning side surface (341) is beta1It should satisfy: alpha is more than 0 degree and less than 90 degrees, beta is more than 60 degrees and less than or equal to1≤135°。
8. The cutting insert according to claim 6, wherein: on a projection plane parallel to the rear surface (16), an included angle gamma between projection lines of the positioning side surfaces (341) of two adjacent bosses (34) satisfies: gamma is more than or equal to minus 5 degrees and less than or equal to 5 degrees.
9. The cutting insert according to any one of claims 3 to 5, wherein: on a projection plane parallel to the rear surface (16), the radius of the circumcircle of the cutting insert is R3, which satisfies: 2R2 is not less than R3 is not less than 4R 2.
10. The cutting insert according to any one of claims 1 to 5, wherein: the main side surface (17) comprises an upper plane (171), a lower plane (172) and a cylindrical side surface (173) connected between the upper plane (171) and the lower plane (172), and the cutting part (25) is arranged on the cylindrical side surface (173).
11. The cutting insert according to claim 10, wherein: on a projection plane which is vertical to the locking surface (521) and vertical to the central axis A, the included angle between the projection line of the locking surface (521) and any plane projection line which is parallel to the upper plane (171) is theta, and the following requirements are met: theta is more than or equal to 3 degrees and less than or equal to 8 degrees.
12. The cutting insert according to claim 10, wherein: the cutting portion (25) includes a main cutting edge (251), a secondary cutting edge (252), and a nose arc (253) located between the main cutting edge (251) and the secondary cutting edge (252).
13. The cutting insert according to claim 12, wherein: in a projection plane perpendicular to the front surface (15), the maximum perpendicular distance f of the nose arc (253) on the side of the front surface (15) relative to the front surface (15) is satisfied: f is more than or equal to 0.2mm and less than or equal to 1 mm.
14. A cutting tool for internal bore machining, comprising a tool shank (60), a fastening screw (95) and an insert (10), characterized in that: the insert (10) is a cutting insert according to any one of claims 1 to 13, the front end of the tool holder (60) is provided with a positioning groove (61) for accommodating the insert (10), and the outer peripheral surface of the front end of the tool holder (60) is provided with a threaded hole (92) for mounting a fastening screw (95).
15. The cutting tool of claim 14, wherein: the positioning groove (61) includes a positioning hole (66) for accommodating the mounting portion (30) and a mounting recess (62) for accommodating the boss (34).
16. The cutting tool of claim 15, wherein: the mounting concave part (62) is provided with two positioning side surfaces (621) matched with the positioning side surfaces (341) of the bosses (34), the radial thicknesses of the two positioning side surfaces (621) are respectively S1 and S2, and the following requirements are met: S1-S2 is not less than 0mm and not more than 0.8 mm.
17. The cutting tool according to any one of claims 14 to 16, wherein: cutter arbor (60) are including the cutting end that is located cutter arbor (60) front end and the exposed core that is located cutter arbor (60) rear end, constant head tank (61) are located the cutting end, the outer peripheral face of exposed core is exposed core side (83), exposed core side (83) are equipped with location plane (90) that are used for cutting tool horizontal location.
18. The cutting tool according to any one of claims 14 to 16, wherein: the clamping end of the cutter rod (60) is symmetrical about a central axis D-D, the threaded hole (92) is symmetrical about a central axis F-F, on a projection plane perpendicular to the central axis D-D, the clamping end of the cutter rod (60) is symmetrical about an axis E-E, the axis E-E is parallel to a projection line of the central axis F-F, and the distance between the axis E-E and the projection line of the central axis F-F is L, so that the following requirements are met: l is more than or equal to 0.1mm and less than or equal to 0.6 mm.
19. The cutting tool of claim 18, wherein: the tool bar (60) further comprises a neck portion (82) connecting the cutting end and the clamping end, and on a projection plane perpendicular to the central axis D-D, the maximum outer dimension of the neck portion (82) along the horizontal axis C-C is D1, and the maximum outer dimension along the axis E-E is D2, so that: d2 is more than or equal to D1.
20. The cutting tool of claim 18, wherein: on a projection plane parallel to the central axis D-D and passing through the central axis F-F, an included angle between the central axis F-F and the central axis D-D is such that: =90 DEG-1。
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US11883888B2 (en) 2021-06-28 2024-01-30 Kennametal Inc. Modular drill with enhanced bump-off capability

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