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WO2013109043A1 - Plaquette de coupe pour le tournage et ensemble d'outil de coupe comprenant cette plaquette - Google Patents

Plaquette de coupe pour le tournage et ensemble d'outil de coupe comprenant cette plaquette Download PDF

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Publication number
WO2013109043A1
WO2013109043A1 PCT/KR2013/000323 KR2013000323W WO2013109043A1 WO 2013109043 A1 WO2013109043 A1 WO 2013109043A1 KR 2013000323 W KR2013000323 W KR 2013000323W WO 2013109043 A1 WO2013109043 A1 WO 2013109043A1
Authority
WO
WIPO (PCT)
Prior art keywords
peripheral surface
cutting insert
upper peripheral
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.)
Ceased
Application number
PCT/KR2013/000323
Other languages
English (en)
Inventor
Bo Ra Na
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taegutec Ltd
Original Assignee
Taegutec Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from KR1020130004554A external-priority patent/KR20130084622A/ko
Application filed by Taegutec Ltd filed Critical Taegutec Ltd
Publication of WO2013109043A1 publication Critical patent/WO2013109043A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B23B27/1644—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 by a clamping member acting almost perpendicularly on the chip-forming plane and at the same time upon the wall of a hole in the cutting insert
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/049—Triangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/086—Rake or top surfaces with one or more grooves
    • B23B2200/087—Rake or top surfaces with one or more grooves for chip breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/086—Rake or top surfaces with one or more grooves
    • B23B2200/088—Rake or top surfaces with one or more grooves for clamping
    • 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
    • B23B2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/12—Seats for cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/16—Shims

Definitions

  • the present invention relates to a cutting insert for turning and a cutting tool assembly including such a cutting insert.
  • FIGS. 1 and 2 When cutting a thin and elongated workpiece, vibration may occur due to a radial cutting force applied to such a workpiece. To address this problem, a turning insert shown in FIGS. 1 and 2 has been introduced in the art.
  • a conventional turning insert 10 has diagonally-positioned first and second corners 11, 12 and is secured to a tool holder 30 by a clamp 20.
  • the turning insert 10 has a first cutting edge 11a at the first corner 11 and a second cutting edge 12a at the second corner 12.
  • one of the first corner 11 and the second corner 12 is selected for cutting a workpiece.
  • the second cutting edge 12a of the second corner 12 may be used for the turning operation.
  • the turning insert 10 shown in FIGS. 1 and 2 has two corners 11, 12. Thus, if all the cutting edges of the two corners are worn out, then the turning insert 10 must be replaced with a new one. This causes a frequent replacement of cutting inserts and thus increases the cutting cost.
  • the present invention is directed to solving the aforementioned problems of the prior art.
  • the present invention provides a cutting insert for turning, which provides the use of three cutting edges and minimizes vibration occurrence, and a cutting tool assembly including such a cutting insert.
  • a cutting insert for turning comprises top and bottom surfaces, three peripheral surfaces between the top and bottom surfaces and cutting edges formed at an intersection between the top surface and the peripheral surface.
  • Each of the three peripheral surfaces comprises a first upper peripheral surface and a second upper peripheral surface.
  • the first upper peripheral surface has a negative clearance angle with respect to the top surface, while the second upper peripheral surface has a positive clearance angle with respect to the top surface.
  • each of the peripheral surfaces further comprises a third upper peripheral surface located between the first upper peripheral surface and the second upper peripheral surface.
  • the negative clearance angle of the first upper peripheral surface transitions to the positive clearance angle of the second upper peripheral surface in the third upper peripheral surface.
  • the first upper peripheral surface comprises a flat surface and a curved surface protruding outwardly from the flat surface.
  • the second upper peripheral surface comprises a flat surface. Further, the positive clearance angle of the second upper peripheral surface is 7°.
  • each of the three peripheral surfaces comprises an upper peripheral surface adjacent to the top surface and a lower peripheral surface adjacent to the bottom surface.
  • the upper peripheral surface comprises the first upper peripheral surface and the second upper peripheral surface.
  • the upper peripheral surface and the lower peripheral surface form a stepped shape and the upper peripheral surface protrudes further outwardly than the lower peripheral surface.
  • the lower peripheral surface has a negative clearance angle with respect to the bottom surface.
  • the lower peripheral surface comprises a first lower peripheral surface and a second lower peripheral surface protruding further outwardly than the first lower peripheral surface.
  • the three peripheral surfaces are rotational symmetrical about a center of the cutting insert.
  • the cutting insert further comprises a plurality of mounting recesses at the top surface. A cross section of the mounting recess decreases toward bottom.
  • the cutting insert further comprises a mounting hole, which is located at a center of the cutting insert, in the bottom surface.
  • the cutting insert further comprises a mounting bore penetrating through the top surface and the bottom surface.
  • a cross section of the mounting bore comprises a triangular shape with rounded corners.
  • a cutting tool assembly comprises a tool holder having an insert pocket, the cutting insert according to embodiments, which is disposed in the insert pocket, and a clamp coupled to the tool holder to secure the cutting insert to the tool holder.
  • each peripheral surface of the cutting insert further comprises a third upper peripheral surface located between the first upper peripheral surface and the second upper peripheral surface.
  • the negative clearance angle of the first upper peripheral surface transitions to the positive clearance angle of the second upper peripheral surface in the third upper peripheral surface.
  • the cutting insert further comprises a plurality of mounting recesses at the top surface and the clamp comprises an engaging protrusion engaging the mounting recess.
  • the cutting insert further comprises a mounting bore penetrating through the top and bottom surfaces and the clamp comprises an engaging pin fitted to the mounting bore of the cutting insert.
  • the cutting insert according to the present embodiments includes three cutting edges.
  • three cutting edges provided in one cutting insert can be used for a cutting operation.
  • the peripheral surface of the cutting insert according to the present embodiments has both a negative clearance angle and a positive clearance angle. Accordingly, when the cutting insert is mounted to the tool holder at a rake angle of 0° (i.e., a neutral rake angle), the radial cutting force decreases and the vibration occurrence can be minimized. Further, when the cutting insert is mounted to the tool holder at a negative rake angle, strong cutting edges can be accomplished.
  • FIG. 1 is a perspective view showing a conventional turning insert and a tool holder.
  • FIG. 2 is a perspective view of the turning insert shown in FIG. 1.
  • FIG. 3 is a perspective view showing a cutting tool assembly including a cutting insert according to one embodiment of the present invention.
  • FIG. 4 is an exploded perspective view of the cutting tool assembly shown in FIG. 3.
  • FIG. 5 is a perspective view of the cutting insert shown in FIG. 4.
  • FIG. 6 is a top view showing of the cutting insert shown in FIG. 4.
  • FIG. 7 is a bottom view of the cutting insert shown in FIG. 4.
  • FIG. 8 is a side view of the cutting insert shown in FIG. 4.
  • FIG. 9 is a partial sectional view taken along the line 9-9 in FIG. 5.
  • FIG. 10 is a sectional view taken along the line 10-10 in FIG. 5.
  • FIG. 11 is a sectional view taken along the line 11-11 in FIG. 5.
  • FIG. 12 is a perspective view of the clamp shown in FIG. 4.
  • FIG. 13 is a side view of the clamp shown in FIG. 4.
  • FIG. 14 is a bottom view of the clamp shown in FIG. 4.
  • FIG. 15 is a perspective view showing a cutting tool assembly including a cutting insert according to another embodiment of the present invention.
  • FIG. 16 is an exploded perspective view of the cutting tool assembly shown in FIG. 15.
  • FIG. 17 is a perspective view of the cutting insert shown in FIG. 16.
  • FIG. 18 is a top view of the cutting insert shown in FIG. 16.
  • FIG. 19 is a partial sectional view taken along the line 19-19 in FIG. 17.
  • FIG. 20 is a sectional view taken along the line 20-20 in FIG. 17.
  • FIG. 21 is a sectional view taken along the line 21-21 in FIG. 17.
  • FIG. 22 is a perspective view of the clamp shown in FIG. 16.
  • FIG. 23 is a side view of the clamp shown in FIG. 16.
  • FIG. 24 is a bottom view of the clamp shown in FIG. 16.
  • the cutting tool assembly comprises: a cutting insert 100, 400; a tool holder 200 to which the cutting insert is mounted; and a clamp 300, 500 securing the cutting insert to the tool holder 200.
  • the tool holder 200 includes: an insert pocket 210 formed in a leading end of the tool holder 200; a shim 220 placed on the insert pocket 210; and a shim pin 230 passing through the shim 220 and engaging the cutting insert 100, 400.
  • the cutting insert 100, 400 is disposed in the insert pocket 210 via the shim 220.
  • the insert pocket 210 has a bottom surface 211, on which the shim 220 is seated, and a vertical surface 212 vertical to the bottom surface 211.
  • the bottom surface 211 has a triangular shape to correspond to a planar shape of the cutting insert 100, 400.
  • the vertical surface 212 is configured to complementarily contact a peripheral surface of the cutting insert (this will be described below).
  • a pin hole 213, to which the shim pin 230 is inserted or fitted, is pierced or drilled in the bottom surface 211 of the insert pocket 210.
  • the shim 220 has a bore 221 through which the shim pin 230 passes.
  • the shim 220 is interposed between the bottom surface 211 of the insert pocket 210 and the cutting insert 100, 400 and provides a predetermined elastic force therebetween. Further, the shim 220 prevents the bottom surface of the cutting insert 100, 200 from sliding relative to the insert pocket 210.
  • a lower section 231 of the shim pin 230 is fitted to the pin hole 213 of the insert pocket 210.
  • An upper section 232 of the shim pin 230 is inserted to and then engages a mounting hole 150 of the cutting insert 100 ( see FIG. 7) or a mounting bore 450 of the cutting insert 400 ( see FIG. 18), thereby fixing the cutting insert 100, 400 to the insert pocket 210.
  • a cross section of the upper section 232 of the shim pin 230 may have a circular shape.
  • the cutting insert 100, 400 is mounted to the tool holder 200 as interposed between the shim 220 and the clamp 300, 500.
  • the clamp 300, 500 is coupled to the top portion of the tool holder 200 and urges or presses the cutting insert 100, 400 against the insert pocket 210 of the tool holder 200.
  • the tool holder 200 has a concave engaging portion 240, which an engagement projection 312, 521 of the clamp 300, 500 ( see FIGS. 13 and 23) engages, and a pin hole 241, to which an insertion pin 322, 522 of the clamp 300, 500 ( see FIGS. 13 and 23) is inserted of fitted (said pin hole 241 is not shown in FIG. 4 but shown in FIG. 16).
  • the tool holder 200 includes a threaded hole 250 adjacent to the vertical surface 212 of the insert pocket.
  • a clamp screw 340, 540 for mounting the clamp 300, 500 screw-engages the threaded hole 250.
  • the cutting insert 100 includes: a top surface 110 and a bottom surface 120 parallel to each other; a peripheral surface 130 extending between the top surface 110 and the bottom surface 120; and cutting edges 140 formed at an intersection between the top surface 110 and the peripheral surface 130.
  • a shape of the cutting insert 100 in top view includes a triangle.
  • the cutting insert 100 has three corners.
  • a corner angle ⁇ see FIG. 6) of each corner is determined such that the cutting insert can have a predetermined mechanical strength. In this embodiment, said corner angle ⁇ is 55°.
  • the top surface 110 has a triangular shape in top view.
  • the cutting insert 100 includes first to third mounting recesses 111a, 111b, 111c that are located in sides of the top surface 110 (sides of a triangle) respectively.
  • the first to third mounting recesses111a, 111b, 111c are rotational symmetrical about a center of the cutting insert 100. Thus, descriptions are made as to only the first mounting recess 111a.
  • the first mounting recess 111a is concave downwardly from the top surface 110. Further, a cross section of the first mounting recess 111a becomes smaller from the top surface 110 toward the bottom surface 120. That is, a surface of the first mounting recess 111a is inclined downwardly with respect to the top surface 110.
  • Two mounting recesses among the first to third mounting recesses111a, 111b, 111c engage a first engaging protrusion 331and a second engaging protrusion 332 of the clamp 300 ( see FIG. 12) respectively.
  • the bottom surface 120 has a triangular shape in bottom view and is parallel to the top surface 110.
  • the bottom surface 120 comes into surface contact with a top end surface of the shim 220.
  • the bottom surface 120 is formed with a mounting hole 150 which the upper section 232 of the shim pin 230 engages.
  • the mounting hole 150 is located at the center of the cutting insert 100 and is formed from the bottom surface 120 toward the top surface 110 at a predetermined depth.
  • a planar shape of the mounting hole 150 is a triangle with linear portions 151 and rounded corners. The linear portions 151 come into contact with a peripheral surface of the upper section 232 of the shim pin 230.
  • Three peripheral surfaces 130 extend between the top surface 110 and the bottom surface 120.
  • the three peripheral surfaces 130 are rotational symmetrical with respect to one another about the center of the cutting insert 100. Thus, descriptions are made as to one peripheral surface 130.
  • the peripheral surface 130 comprises an upper peripheral surface 131 adjacent to the top surface 110 and a lower peripheral surface 133 adjacent to the bottom surface 120.
  • the upper peripheral surface 131 and the lower peripheral surface 133 form a stepped shape.
  • the upper peripheral surface 131 protrudes further outwardly than the lower peripheral surface 133.
  • the upper peripheral surface 131 comprises first upper peripheral surfaces 131a1, 131a2, a second upper peripheral surface 131b and a third upper peripheral surface 131c.
  • the first upper peripheral surface 131a1, 131a2 includes a flat surface 131a1 and a curved surface 131a2 that protrudes outwardly from the flat surface 131a1. As shown in FIGS. 9 and 10, the first upper peripheral surfaces 131a1, 131a2 are perpendicular to the top surface 110 and the bottom surface 120. That is, the first upper peripheral surfaces 131a1, 131a2 have a negative clearance angle with respect to the top surface 110.
  • the second upper peripheral surface 131b is flat and is located between the corner and the mounting recess of the cutting insert 100. As shown in FIG. 11, the second upper peripheral surface 131b has a positive clearance angle ⁇ with respect to the top surface 110. In this embodiment, said positive clearance angle ⁇ is 7°. That is, the second upper peripheral surface 131b is at an angle of 83°with respect to the top surface 110.
  • the third upper peripheral surface 131c is located between the curved surface 131a2 of the first upper peripheral surface and the second upper peripheral surface 131b.
  • the third upper peripheral surface 131c comprises a curved surface that extends or protrudes further outwardly from a right end of the curved surface 131a2 of the first upper peripheral surface.
  • the third upper peripheral surface 131c has both a negative clearance angle and a positive clearance angle with respect to the top surface 110. That is, the third upper peripheral surface 131c comprises a curved surface wherein the negative clearance angle of the first upper peripheral surface 131a1, 131a2 transitions to the positive clearance angle of the second upper peripheral surface 131b.
  • the lower peripheral surface 133 comprises a first lower peripheral surface 133a, a second lower peripheral surface 133b and a third lower peripheral surface 133c.
  • the first and second lower peripheral surfaces 133a, 133b are flat and are parallel to the flat surface 131a1 of the first upper peripheral surface.
  • the second lower peripheral surface 133b protrudes further outwardly than the first lower peripheral surface 133a and thus the first and second lower peripheral surfaces 133a, 133b form a stepped shape.
  • the third lower peripheral surface 133c interconnects the first lower peripheral surface 133a and the second lower peripheral surface 133b.
  • the third lower peripheral surface 133c includes a curved surface which extends outwardly from the first lower peripheral surface 133a to the second lower peripheral surface 133b. As shown in FIGS. 9 to 11, the lower peripheral surface 133 (i.e., the first to third lower peripheral surfaces 133a, 133b, 133c) is perpendicular to the top surface 110 and the bottom surface 120.
  • the cutting edge 140 comprises a major cutting edge 141, which is formed at an intersection between the first upper peripheral surface 131a1, 131a2 and the top surface 110, and a minor cutting edge 142, which is formed at an intersection between the second upper peripheral surface 131b and the top surface 110.
  • the major cutting edge 141 and the minor cutting edge 142 have a height lower than the top surface 110. Further, the height of the major cutting edge 141 from the bottom surface 120 decreases from one end toward the opposite end of the first upper peripheral surface 131a1, 131a2.
  • a chip breaker 143 is formed in a portion interconnecting the opposite end of the major cutting edge 141 and the top surface 110. Chips generated during cutting a workpiece flow along the major cutting edge 141 and are then broken by the chip breaker 143. With the configuration and arrangement of the major cutting edge 141 and the chip breaker 143, a cutting resistance acting on the cutting insert 100 can be reduced.
  • the major cutting edge 141 has a negative clearance angle
  • the minor cutting edge 142 has a positive clearance angle.
  • a radial cutting force acting on the cutting insert 100 decreases due to the positive clearance angle in the minor cutting edge 142, thereby minimizing the vibration of a workpiece.
  • the rigidity or stiffness of the cutting edge can increase due to the negative clearance angle of the major cutting edge 141.
  • the clamp 300 of this embodiment includes a mounting bore 310, an engagement projection 321, an insertion pin 322 and first and second engaging protrusions 331, 332.
  • the clamp 300 is coupled to the tool holder 200 by a clamp screw 340 ( see FIGS. 3 and 4) passing through the mounting bore 310.
  • the engagement projection 321 is located at the rear of the clamp 300 and protrudes downwardly.
  • the engagement projection 321 engages the concave engaging portion 240 of the tool holder 200.
  • the insertion pin 322 is located in the engagement projection 321 and protrudes downwardly from the engagement projection 321.
  • the insertion pin 322 is inserted or fitted to the pin hole 241 of the tool holder 200, thus fixing the clamp 300 to the tool holder 200.
  • the clamp screw 340 passes through the mounting bore 310 and then screw-engages the threaded hole 250 of the tool holder 200.
  • the first and second engaging protrusions 331, 332 are spaced apart from each other at the front of the clamp 300 and protrude downwardly.
  • the first and second engaging protrusions 331, 332 engage any two mounting recesses of the first to third mounting recesses111a, 111b, 111c of the cutting insert 100.
  • the first engaging protrusion 331 engages the first mounting recess 111a
  • the second engaging protrusion 332 engages the third mounting recess 111c.
  • the cross section of the first to third mounting recesses111a, 111b, 111c decreases.
  • the first and second engaging protrusions 331, 332 can strongly fix the cutting insert 100 to the tool holder 200.
  • centers of the mounting bore 310, the insertion pin 322 and the first engaging protrusion 331 reside on a straight line.
  • the first engaging protrusion 331and the second engaging protrusion 332 are positioned at an acute angle about the center of the mounting bore 310. That is, the insertion pin 322 and the first and second engaging protrusions 331, 332 are asymmetrical with respect to one another about the center of the mounting bore 310. Further, a distance between the center of the mounting bore 310 and the insertion pin 322, a distance between the center of the mounting bore 310 and the first engaging protrusion 331 and a distance between the center of the mounting bore 310 and the second engaging protrusion 332 are different.
  • a resultant force which acts on the cutting insert 100 through the first and second engaging protrusions 331, 332, is asymmetrical with a force that acts on the tool holder 200 through the insertion pin 322. Accordingly, the cutting insert 100 can be firmly fixed to the tool holder 200 by the clamp 300.
  • FIGS. 15 and 16 show a cutting tool assembly with the cutting insert 400 according to another embodiment of the present invention.
  • the cutting insert 400 comprises a top surface 410, a bottom surface 420, a peripheral surface 430 and the cutting edges 140.
  • the cutting insert 400 of this embodiment has the same configuration as the cutting insert 100, which is described with reference to FIGS. 3 to 11, except that the cutting insert 400 does not include the mounting recesses111a, 111b, 111c shown in FIG. 4 and the cutting insert 400 includes a mounting bore 450 penetrating through the top surface 410 and the bottom surface 420 for securement of the cutting insert 400.
  • the cutting insert 400 of this embodiment descriptions are mainly made as to the peripheral surface 430 and the mounting bore 450.
  • the peripheral surface 430 comprises an upper peripheral surface 431 adjacent to the top surface 410 and the lower peripheral surface 133 adjacent to the bottom surface 420.
  • the lower peripheral surface 133 of the cutting insert 400 according to this embodiment is identical to the lower peripheral surface 133 of the foregoing embodiment shown in FIGS. 3 to 11.
  • the upper peripheral surface 431 comprises a first upper peripheral surface 431a1, 431a2, a second upper peripheral surface 431b and a third upper peripheral surface 431c.
  • the first upper peripheral surface 431a1, 431a2 includes a flat surface 431a1 and a curved surface 431a2 that extends or protrudes outwardly from the flat surface 431a1.
  • the first upper peripheral surface 431a1, 431a2 is perpendicular to the top surface 410 and the bottom surface 420. That is, the first upper peripheral surfaces 431a1, 431a2 have a negative clearance angle with respect to the top surface 410.
  • the second upper peripheral surface 431b is flat and is located adjacent to the corner of the cutting insert 400. As shown in FIG. 21, the second upper peripheral surface 431b has a positive clearance angle ⁇ with respect to the top surface 410. In this embodiment, said positive clearance angle ⁇ is 7°. Thus, the second upper peripheral surface 431b is at an angle of 83° with respect to the top surface 410.
  • the third upper peripheral surface 431c is located between the curved surface 431a2 of the first upper peripheral surface and the second upper peripheral surface 431b.
  • the third upper peripheral surface 431c includes a curved surface, which extends or protrudes further outwardly from a right end of the curved surface 431a2 of the first upper peripheral surface.
  • the third upper peripheral surface 431c has both a negative clearance angle and a positive clearance angle with respect to the top surface 410. That is, the third upper peripheral surface 431c includes a curved surface wherein the negative clearance angle of the first upper peripheral surface 431a1, 431a2 transitions to the positive clearance angle of the second upper peripheral surface 431b.
  • the cutting insert 400 has a mounting bore 450 for securement of the cutting insert 400.
  • the mounting bore 450 penetrates through the top surface 410 and the bottom surface 420.
  • the mounting bore 450 is perpendicular to the top surface 410 and the bottom surface 420.
  • the mounting bore 450 penetrates from the top surface 410 to the bottom surface 420 or from the bottom surface 420 to the top surface 410 in the form of a triangular prism having rounded corners.
  • a planar shape or cross-sectional shape of the mounting bore 450 is a triangle with linear portions 451 and rounded corners.
  • the clamp 500 which is employed in the cutting tool assembly according to this embodiment.
  • the clamp 500 includes mounting bore 510, an engagement projection 521, an insertion pin 522 and an engaging pin 530.
  • the clamp 500 is coupled to the tool holder 200 through a clamp screw 540 ( see FIG. 16), which passes through the mounting bore 510.
  • the engagement projection 521 is located at the rear of the clamp 500 and protrudes downwardly.
  • the engagement projection 521 engages the concave engaging portion 240 of the tool holder 200.
  • the insertion pin 522 is located in the engagement projection 521 and protrudes downwardly from the engagement projection 521.
  • the insertion pin 522 may have a cylindrical shape.
  • the insertion pin 522 is inserted or fitted to the pin hole 241 ( see FIG. 16) of the tool holder 200, thus fixing the clamp 500 to the tool holder 200.
  • the clamp screw 540 passes through the mounting bore 510 and then screw-engages the threaded hole 250 of the tool holder 200.
  • the engaging pin 530 is located at the front of the clamp 500 and protrudes downwardly.
  • the engaging pin 530 is inserted or fitted to the mounting bore 450 of the cutting insert 400 to thus engage the mounting bore 450.
  • the mounting bore 510, the insertion pin 522 and the engaging pin 530 may lie on a straight line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
PCT/KR2013/000323 2012-01-17 2013-01-16 Plaquette de coupe pour le tournage et ensemble d'outil de coupe comprenant cette plaquette Ceased WO2013109043A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20120005124 2012-01-17
KR10-2012-0005124 2012-01-17
KR1020130004554A KR20130084622A (ko) 2012-01-17 2013-01-15 선삭용 절삭인서트 및 이를 구비하는 절삭공구 조립체
KR10-2013-0004554 2013-01-15

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Publication Number Publication Date
WO2013109043A1 true WO2013109043A1 (fr) 2013-07-25

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PCT/KR2013/000323 Ceased WO2013109043A1 (fr) 2012-01-17 2013-01-16 Plaquette de coupe pour le tournage et ensemble d'outil de coupe comprenant cette plaquette

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4046731A1 (fr) * 2021-02-19 2022-08-24 Tungaloy Corporation Outil de coupe, insert de coupe et outil de fixation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5246315A (en) * 1990-12-03 1993-09-21 Sandvik Ab Cutting insert and cutting tool for a peeling operation
JP2000296402A (ja) * 1999-04-14 2000-10-24 Toshiba Tungaloy Co Ltd スローアウェイ式バイトのクランプ構造
US7488143B2 (en) * 2006-01-10 2009-02-10 Sandvik Intellectual Property Ab Turning insert and a turning tool
EP1549450B1 (fr) * 2002-06-25 2009-11-18 Seco Tools Ab Piece de coupe pour machine d'enlevement de copeaux
US20100266354A1 (en) * 2007-06-21 2010-10-21 Wolfgang Zitzlaff Negative insert having double-positive clearance surface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5246315A (en) * 1990-12-03 1993-09-21 Sandvik Ab Cutting insert and cutting tool for a peeling operation
JP2000296402A (ja) * 1999-04-14 2000-10-24 Toshiba Tungaloy Co Ltd スローアウェイ式バイトのクランプ構造
EP1549450B1 (fr) * 2002-06-25 2009-11-18 Seco Tools Ab Piece de coupe pour machine d'enlevement de copeaux
US7488143B2 (en) * 2006-01-10 2009-02-10 Sandvik Intellectual Property Ab Turning insert and a turning tool
US20100266354A1 (en) * 2007-06-21 2010-10-21 Wolfgang Zitzlaff Negative insert having double-positive clearance surface

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4046731A1 (fr) * 2021-02-19 2022-08-24 Tungaloy Corporation Outil de coupe, insert de coupe et outil de fixation
CN114951718A (zh) * 2021-02-19 2022-08-30 株式会社泰珂洛 切削工具、切削刀片及保持件
US11786976B2 (en) 2021-02-19 2023-10-17 Tungaloy Corporation Cutting tool, cutting insert and holding tool
CN114951718B (zh) * 2021-02-19 2024-02-02 株式会社泰珂洛 切削工具、切削刀片及保持件

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