WO2019021605A1 - 切削工具用ホルダ - Google Patents
切削工具用ホルダ Download PDFInfo
- Publication number
- WO2019021605A1 WO2019021605A1 PCT/JP2018/019753 JP2018019753W WO2019021605A1 WO 2019021605 A1 WO2019021605 A1 WO 2019021605A1 JP 2018019753 W JP2018019753 W JP 2018019753W WO 2019021605 A1 WO2019021605 A1 WO 2019021605A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coolant
- holder
- cutting insert
- cutting
- seating surface
- Prior art date
Links
- 239000002826 coolant Substances 0.000 claims abstract description 196
- 238000003825 pressing Methods 0.000 claims abstract description 71
- 230000007423 decrease Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 15
- 239000013256 coordination polymer Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000463 material 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
- 239000000843 powder Substances 0.000 description 1
Images
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
- B23B27/1659—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 exchangeable cutting inserts
-
- 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
- B23B27/1677—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 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 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
- B23B27/10—Cutting tools with special provision for cooling
-
- 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
Definitions
- the present disclosure relates to a holder for a cutting tool.
- This application claims the priority based on Japanese Patent Application No. 201-145605 which was filed on July 27, 2017. The entire contents of the description of the Japanese patent application are incorporated herein by reference.
- Patent Document 1 a cutting edge-replaceable cutting tool described in JP-A-2015-160266 (Patent Document 1) is known.
- the indexable cutting tool described in Patent Document 1 includes a holder body, a cutting insert, a clamp piece, and a clamp screw.
- the holder body has a mounting seat.
- the cutting insert is mounted on the mounting seat of the holder body.
- the clamp piece is attached to the holder body by a clamp screw.
- the clamp piece fixes the cutting insert to the holder body by pressing the cutting insert against the holder body.
- the holder main body is provided with a coolant supply hole.
- the coolant supply hole supplies the coolant from the flank side of the cutting insert toward the cutting edge of the cutting tool.
- a holder for a cutting tool supports a cutting insert having a rake face, a flank face continuous with the rake face, and a cutting edge constituted by a ridge line forming a boundary between the rake face and the flank face. It is a holder for cutting tools.
- a holder for a cutting tool according to an aspect of the present disclosure is a holder body having a seating surface on which a cutting insert is placed, and a pressing member for positioning and fixing the cutting insert placed on the seating surface on the holder body. And a fixing member for fixing the pressing member to the holder body.
- the pressing member has a tip end which is an end close to the cutting edge of the cutting insert placed on the seating surface side, and a base which is an end away from the cutting edge of the cutting insert placed on the seating surface And an end.
- the tip portion is provided with a first coolant spout from which the coolant spouts.
- a first flow path through which the coolant flows is provided inside the holder body.
- a coolant reservoir that is connected to the first flow path when the pressing member is fixed to the holder main body and that is supplied from the first flow path, and a coolant that is stored in the coolant reservoir And a second flow path that supplies the first coolant jet port.
- the coolant reservoir has a larger cross-sectional area in a cross section orthogonal to the flow direction of the coolant than the first flow path and the second flow path.
- the coolant reservoir is disposed on the proximal end side with respect to the position at which the pressing member is fixed to the holder body in the direction from the distal end to the proximal end.
- FIG. 1 is a perspective view of a cutting tool holder according to the first embodiment.
- FIG. 2 is a perspective view of the holder main body 1 in the cutting tool holder according to the first embodiment.
- FIG. 3 is a cross-sectional view taken along line III-III of FIG.
- FIG. 4 is a top view of the pressing member 2 in the cutting tool holder according to the first embodiment.
- FIG. 5 is a front view of the pressing member 2 in the cutting tool holder according to the first embodiment.
- FIG. 6 is a bottom view of the pressing member 2 in the cutting tool holder according to the first embodiment.
- 7 is a cross-sectional view taken along line VII-VII of FIG. FIG.
- FIG. 8 is a schematic view showing the positional relationship between the pressing member 2 and the cutting insert 4 in the cutting tool holder according to the first embodiment.
- FIG. 9 is a perspective view of an embodiment of the cutting insert 4.
- FIG. 10 is a front view of the pressing member 2 in the cutting tool holder according to the second embodiment.
- the chips cut from the work material are directed from the cutting edge to the rake surface side. Therefore, in order to obtain the chip crushing effect by the coolant, it is preferable that the coolant be supplied to the cutting edge from the rake face side. However, in the indexable cutting tool described in Patent Document 1, the coolant is supplied to the cutting edge from the flank side.
- the present disclosure has been made in view of the problems of the prior art as described above. More specifically, the present disclosure provides a cutting tool holder capable of supplying coolant from the rake face side of the cutting insert while securing rigidity.
- coolant can be supplied to the cutting edge from the rake surface side of the cutting insert while securing the rigidity.
- a cutting tool holder includes a cutting face, a cutting face having a flank face continuous with the face, and a cutting edge having a ridge line forming a boundary between the face and the flank face.
- a holder for a cutting tool that supports is a holder body having a seating surface on which a cutting insert is placed, and a pressing member for positioning and fixing the cutting insert placed on the seating surface on the holder body. And a fixing member for fixing the pressing member to the holder body.
- the pressing member has a tip end which is an end close to the cutting edge of the cutting insert placed on the seating surface side, and a base which is an end away from the cutting edge of the cutting insert placed on the seating surface And an end.
- the tip portion is provided with a first coolant spout from which the coolant spouts.
- a first flow path through which the coolant flows is provided inside the holder body.
- a coolant reservoir that is connected to the first flow path when the pressing member is fixed to the holder main body and that is supplied from the first flow path, and a coolant that is stored in the coolant reservoir And a second flow path that supplies the first coolant jet port.
- the coolant reservoir has a larger cross-sectional area in a cross section orthogonal to the flow direction of the coolant than the first flow path and the second flow path.
- the coolant reservoir is disposed on the proximal end side with respect to the position at which the pressing member is fixed to the holder body in the direction from the distal end to the proximal end.
- the coolant can be supplied to the cutting edge from the rake surface side of the cutting insert while securing the rigidity.
- the pressing member is parallel to the direction from the proximal end toward the distal end when viewed from the direction perpendicular to the rake surface of the cutting insert placed on the seating surface.
- the holder main body may be in contact only at a portion opposite to the fixing member with respect to a straight line contacting the fixing member.
- the cutting insert can be more uniformly fixed by the pressing member.
- the cross-sectional area of the second flow path in the cross section orthogonal to the flow direction of the coolant decreases as it goes from the coolant reservoir to the first coolant outlet. It may be done.
- the pressure of the coolant jetted from the first coolant jet port becomes higher. Therefore, according to the holder for a cutting tool according to the above (3), the cooling effect of the cutting edge by the coolant and the chip crushing effect can be enhanced.
- the width of the first coolant jet port in a direction perpendicular to the jet direction of the coolant and parallel to the rake surface of the cutting insert placed on the seating surface May be greater than the width of the first coolant jet in the direction perpendicular to the rake surface of the cutting insert placed on the seating surface.
- the coolant ejected from the first coolant jet port is supplied near the cutting edge in a flat shape along the extending direction of the cutting edge. Therefore, in the holder for a cutting tool according to the above (4), the coolant is likely to enter between the cutting edge and the chips. As a result, according to the holder for a cutting tool of the above (4), the chip crushing effect can be further enhanced.
- the second flow path is perpendicular to the ejection direction of the coolant and in a direction parallel to the rake surface of the cutting insert placed on the seating surface. It may have a first end which is an end of two flow paths and a second end which is an end opposite to the first end.
- the second extension line which extends from the first coolant outlet a straight line indicating the second end when viewed from the direction perpendicular to the rake face, refers to the direction perpendicular to the rake face of the cutting insert placed on the seating surface
- the cutting edge of the cutting insert placed on the seating surface may intersect with each other.
- the coolant ejected from the first coolant jet port is supplied to the cutting edge in the most converged state. Therefore, according to the cutting tool of the above (5), the cooling effect of the cutting edge by the coolant and the chip crushing effect can be partially maximized.
- the second flow path is perpendicular to the ejection direction of the coolant and is parallel to the rake surface of the cutting insert placed on the seating surface. It may have a first end which is an end of two flow paths and a second end which is an end opposite to the first end.
- the second extension line which extends from the first coolant outlet a straight line indicating the second end when viewed from the direction perpendicular to the rake face, refers to the direction perpendicular to the rake face of the cutting insert placed on the seating surface And may intersect at a position deviated from the cutting edge.
- the coolant jetted from the first coolant jet port is supplied to the cutting edge in a state where it spreads along the extending direction of the cutting edge. Therefore, according to the holder for a cutting tool according to (6), the coolant can cool a wider area of the cutting edge.
- the second to eject the coolant from the flank side of the cutting insert placed on the seating surface to the cutting edge of the cutting insert A coolant jet may be provided.
- a third flow passage for supplying the coolant flowing through the first flow passage to the second coolant outlet may be provided inside the holder body.
- the coolant can be supplied to the cutting edge of the cutting insert from both the rake face side of the cutting insert and the flank face side of the cutting insert. Therefore, according to the holder for a cutting tool according to (7), the cooling effect by the coolant and the lubricating effect by the coolant can be further enhanced.
- FIG. 1 is a perspective view of a cutting tool holder according to the first embodiment.
- the cutting tool holder according to the first embodiment supports the cutting insert 4.
- the cutting tool holder according to the first embodiment has a holder body 1, a pressing member 2 and a fixing member 3.
- the cutting tool holder according to the first embodiment may further have a washer 5.
- the cutting tool holder according to the first embodiment supports the cutting insert 4, but the cutting tool holder according to the present disclosure is not limited to this, and can be applied to applications that support various cutting tools.
- FIG. 2 is a perspective view of the holder main body 1 in the cutting tool holder according to the first embodiment.
- the holder body 1 has a first end 1 a and a second end 1 b.
- the second end 1 b is an end opposite to the first end 1 a.
- the first end 1a is an end provided with a seating surface 11 described later.
- the second end 1 b is an end on the shank side.
- the holder main body 1 has a shape extending from the second end 1 b toward the first end 1 a.
- the holder main body 1 has a first surface 1c, a second surface 1d, and a third surface 1e.
- the second surface 1d is the opposite surface of the first surface 1c.
- the third surface 1e is continuous with the first surface 1c and the second surface 1d.
- the holder body 1 has a seating surface 11.
- the seating surface 11 is provided on the first surface 1 c of the holder body 1 and is a surface one step lower than the first surface 1 c.
- the cutting insert 4 is placed on the seating surface 11.
- the washer 5 is disposed between the cutting insert 4 and the seating surface 11, but the washer 5 may be omitted.
- the holder body 1 is provided with a screw hole 12.
- the screw hole 12 extends in a direction from the first surface 1 c of the holder body 1 to the inside of the holder body 1.
- the holder body 1 is provided with an insertion portion 13.
- the first surface 1 c of the holder body 1 is recessed in the insertion portion 13 in the direction toward the inside of the holder body 1.
- FIG. 3 is a cross-sectional view taken along line III-III of FIG. In FIG. 3, the flow of the coolant is indicated by an arrow.
- the holder main body 1 is provided with a first flow path 14.
- One end of the first flow passage 14 is connected to the outside of the holder body 1 at the insertion portion 13.
- the other end of the first flow path 14 is connected to the outside of the holder body 1 at, for example, the second surface 1 d of the holder body 1.
- the coolant flows in the first flow path 14.
- the coolant is, for example, a cutting oil.
- the first flow passage 14 has a cross-sectional area A1.
- the cross-sectional area A1 is a cross-sectional area of the first flow passage 14 in a cross section orthogonal to the flow direction of the coolant. There is no portion between the one end and the other end of the first flow passage 14 in which the cross-sectional area A1 is partially larger than the circumference. That is, the cross-sectional area A1 is monotonically decreasing, monotonously increasing or constant from one end side to the other end side. From another point of view, no coolant reservoir is provided inside the holder body 1.
- the coolant outlet 15 may be further provided in the holder body 1.
- a third flow path 16 may be further provided inside the holder body 1.
- the coolant jet port 15 is provided on the first end 1 a side of the holder main body 1.
- the holder body 1 is open at the coolant jet port 15.
- the third flow path 16 is connected to the first flow path 14 at one end, and is connected to the coolant spout 15 at the other end. Therefore, a part of the coolant flowing through the first flow passage 14 is jetted from the coolant jet port 15 through the third flow passage 16.
- the coolant spout 15 be disposed to face a cutting edge 43 provided on the cutting insert 4. That is, the coolant spouted from the coolant spout 15 is supplied to the vicinity of the cutting edge 43 from the flank surface 42 side.
- FIG. 4 is a top view of the pressing member 2 in the cutting tool holder according to the first embodiment.
- FIG. 5 is a front view of the pressing member 2 in the cutting tool holder according to the first embodiment.
- the pressing member 2 is a member for positioning and fixing the cutting insert 4 (see FIGS. 1 and 9) placed on the seating surface 11 in the holder main body 1.
- the pressing member 2 has a distal end portion 2a and a proximal end portion 2b.
- the front end portion 2 a is an end portion of the pressing member 2 positioned on the seating surface 11 side when the pressing member 2 is attached to the holder main body 1 (see FIG. 1).
- the tip 2 a is an end closer to the cutting edge 43 of the cutting insert 4 placed on the seating surface 11 of the holder body 1.
- the proximal end 2 b is an end opposite to the distal end 2 a.
- the base end 2 b is an end remote from the cutting edge 43 of the cutting insert 4 placed on the seating surface 11 of the holder body 1.
- the pressing member 2 is inserted into the insertion portion 13 of the holder main body 1 at the proximal end 2 b.
- the pressing member 2 is provided with a coolant jet port 21.
- the coolant jet port 21 is provided at the front end 2 a of the pressing member 2.
- the number of coolant jets 21 may be plural.
- the pressing member 2 is open at the coolant jet port 21.
- the pressing member 2 is provided with a coolant inlet 22.
- FIG. 6 is a bottom view of the pressing member 2 in the cutting tool holder according to the first embodiment. As shown in FIG. 6, the coolant inlet 22 is provided at the proximal end 2 b of the pressing member 2.
- the pressing member 2 is open at the coolant inlet 22. The coolant flows into the inside of the pressing member 2 from the coolant inlet 22.
- FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. As shown in FIG. 7, the holding member 2 is provided with a coolant reservoir 23 and a second flow path 24. The coolant reservoir 23 and the second flow path 24 are provided inside the pressing member 2.
- the coolant reservoir 23 is located closer to the proximal end 2 b than the second flow passage 24 inside the pressing member 2.
- the coolant reservoir 23 is connected to the outside of the pressing member 2 at the coolant inlet 22.
- the coolant reservoir 23 is connected to the second flow passage 24 at an end opposite to the coolant inlet 22.
- the second flow path 24 is located closer to the tip 2 a than the coolant reservoir 23 inside the pressing member 2.
- the second flow passage 24 is connected to the outside of the pressing member 2 at the coolant jet port 21.
- the base end portion 2 b of the pressing member 2 is inserted into the insertion portion 13, whereby the coolant reservoir 23 and the first flow path 14 are connected. Therefore, the coolant flowing through the first flow passage 14 is supplied to the coolant reservoir 23 and is stored in the coolant reservoir 23.
- the coolant reservoir 23 and the second flow path 24 are connected to each other. Therefore, the coolant stored in the coolant reservoir 23 spouts from the coolant spout 21 via the second flow path 24.
- the coolant reservoir 23 has a cross-sectional area A2 in a cross section orthogonal to the coolant flow direction.
- the second flow path 24 has a cross-sectional area A3 in a cross section orthogonal to the coolant flow direction.
- Cross-sectional area A2 is larger than cross-sectional area A3.
- Cross-sectional area A2 is larger than cross-sectional area A1. From this point of view, the coolant reservoir for storing the coolant is provided not in the holder main body 1 but in the pressing member 2.
- the cross-sectional area A3 becomes smaller as it goes from the coolant reservoir 23 side to the coolant jet port 21 side.
- the second flow path 24 has a tapered shape in which the cross-sectional area decreases from the coolant reservoir 23 toward the coolant jet port 21.
- FIG. 8 is a schematic view showing the positional relationship between the pressing member 2 and the cutting insert 4 in the cutting tool holder according to the first embodiment. As shown in FIG. 8, preferably, the coolant spout 21 is arranged to face a cutting edge 43 provided on the cutting insert 4.
- the second flow passage 24 has a first end 24 a and a second end 24 b.
- the first end 24 a is an end of the second flow passage 24 in a direction perpendicular to the ejection direction of the coolant and parallel to the rake surface 41 of the cutting insert 4 mounted on the seating surface 11.
- the cutting insert 4 is disposed so that the opposite surface of the rake surface 41 faces the seating surface 11, when the rake surface 41 is parallel to the opposite surface of the rake surface 41, the seating surface 11 is The direction perpendicular to the plane coincides with the direction perpendicular to the rake face 41.
- the second end 24 b is the opposite end of the first end 24 a.
- first end 24a When viewed in the direction perpendicular to the rake surface 41 of the cutting insert 4 placed on the seating surface 11, the first end 24a is indicated by a first straight line L1.
- the second end 24b is indicated by a second straight line L2 when viewed from the direction perpendicular to the rake surface 41 of the cutting insert 4 mounted on the seating surface 11.
- a first extension line EL1 which is an extension line extending the first straight line L1 from the coolant jet port 21
- second extension line EL2 which is an extension line extending the second straight line L2 from the coolant jet port 21.
- intersection point CP preferably overlaps the cutting edge 43 as viewed in a direction perpendicular to the rake surface 41 of the cutting insert 4 placed on the seating surface 11.
- the intersection point CP may be at a position shifted from the cutting edge 43. That the intersection point CP is at a position deviated from the cutting edge 43 means that the intersection point CP is at a position deviated from the cutting edge 43 in the flow direction of the coolant jetted from the coolant ejection port 21 or the intersection point CP is a coolant ejection port It means that it is in the direction shifted from the cutting edge 43 in the direction orthogonal to the direction of the flow of the coolant ejected from the nozzle 21.
- the pressing member 2 is provided with a through hole 25.
- the through hole 25 is arranged to overlap with the position of the screw hole 12.
- the fixing member 3 is passed through the through hole 25.
- the fixing member 3 is, for example, a screw.
- the fixing member 3 is fastened to the screw hole 12.
- the pressing member 2 is fixed to the holder main body 1.
- the position of the pressing member 2 fixed to the holder body 1 is referred to as a fixed position FP.
- the fixing position FP coincides with the position of the central axis of the fixing member 3.
- the width of the through hole 25 in the direction from the distal end 2a toward the proximal end 2b is preferably larger than the width of the through hole 25 in the direction orthogonal to the direction from the distal end 2a toward the proximal end 2b.
- the planar shape of the through hole 25 is, for example, an oval shape having a major axis in the direction from the distal end 2a to the proximal end 2b.
- a straight line parallel to the direction from the proximal end 2b to the distal end 2a and in contact with the fixing member 3 when viewed from the direction perpendicular to the rake surface 41 of the cutting insert 4 is a straight line L3 (see FIG. 4) ). It is preferable that the pressing member 2 is in contact with the holder main body 1 only at a portion located on the opposite side of the fixing member 3 with respect to the straight line L3.
- the coolant reservoir 23 is located closer to the proximal end 2 b than the fixed position FP in the direction from the distal end 2 a toward the proximal end 2 b. More specifically, the coolant reservoir 23 is located closer to the proximal end 2b than the central axis of the fixing member 3 in the direction from the distal end 2a to the proximal end 2b.
- the pressing member 2 can be formed by, for example, a 3D printer or MIM method (Metal Injection Molding, metal powder injection molding method).
- FIG. 9 is a perspective view of an embodiment of the cutting insert 4.
- the cutting insert 4 has a rake face 41, a flank 42 and a cutting edge 43.
- the cutting insert 4 is placed on the seating surface 11 such that the opposite surface of the rake surface 41 faces the seating surface 11.
- the cutting insert 4 is fixed to the seating surface 11 by being pressed by the pressing member 2 positioned on the tip end 2 a side.
- the flank 42 is connected to the rake face 41.
- the cutting edge 43 is constituted by a ridge line forming a boundary between the rake face 41 and the flank face 42.
- the coolant includes the first flow passage 14 provided inside the holder main body 1 and the coolant reservoir 23 and the second flow passage 24 provided inside the pressing member 2.
- the coolant is spouted from the coolant spout 21 and supplied to the cutting insert 4. Therefore, in the holder for a cutting tool according to the first embodiment, the coolant can be supplied to the cutting edge 43 from the rake surface 41 side.
- the thickness of the holder main body 1 becomes thin at the portion where the coolant reservoir is provided. Further, when the coolant reservoir is provided inside the holder main body 1, the entire length of the holder main body 1 becomes longer by that amount. Therefore, when the coolant reservoir is provided inside the holder main body 1, the rigidity of the holder main body 1 is reduced. If the rigidity of the holder body 1 is reduced, the holder body 1 may be elastically deformed during cutting, which may cause vibration (vibration) and the like, which may lead to a reduction in the precision of the cutting.
- the coolant reservoir 23 is disposed not inside the holder main body 1 but inside the pressing member 2. Therefore, in the holder for a cutting tool according to the first embodiment, it is possible to suppress the decrease in the rigidity of the holder main body 1 accompanying the formation of the coolant reservoir.
- the coolant reservoir 23 is disposed closer to the proximal end 2b than the fixed position FP in the direction from the distal end 2a to the proximal end 2b.
- What mainly contributes to the fixation of the cutting insert 4 is the portion of the pressing member 2 which is closer to the tip 2a than the fixing position FP. Therefore, in the holder for a cutting tool according to the first embodiment, the rigidity of the pressing member 2 necessary to fix the cutting insert 4 can be secured.
- the coolant can be supplied to the cutting edge 43 from the rake surface 41 side of the cutting insert 4 while securing the rigidity of the cutting tool holder.
- the coolant when the intersection point CP is at a position overlapping the cutting edge 43, the coolant is supplied to the cutting edge 43 in the most converged state. Therefore, in this case, the cooling effect by the coolant and the chip crushing effect can be partially maximized.
- the coolant when the intersection point CP is at a position shifted from the cutting edge 43, the coolant is supplied to the cutting edge 43 in a state where the coolant spreads along the extending direction of the cutting edge 43. Ru. Therefore, in this case, a wider area of the cutting edge 43 can be cooled by the coolant.
- the rake surface 41 side and the flank surface Coolant can be supplied to the cutting edge 43 from both sides 42. Therefore, the cooling effect by the coolant and the lubricating effect by the coolant can be further enhanced.
- the cutting tool holder according to the second embodiment includes a holder body 1, a pressing member 2 and a fixing member 3.
- the cutting tool holder according to the second embodiment is common to the cutting tool holder according to the first embodiment.
- the cutting tool holder according to the second embodiment is different from the cutting tool holder according to the first embodiment in the configuration of the coolant jet nozzle 21.
- FIG. 10 is a front view of the pressing member 2 in the cutting tool holder according to the second embodiment.
- the coolant jet nozzle 21 has a first width W1 and a second width W2.
- the first width W1 is the width of the coolant jet port 21 in the direction perpendicular to the jet direction of the coolant and parallel to the rake surface 41 of the cutting insert 4 mounted on the seating surface 11.
- the second width W2 is the width of the coolant jet port 21 in the direction perpendicular to the rake surface 41 of the cutting insert 4 placed on the seating surface 11.
- the first width W1 is larger than the second width W2.
- the planar shape of the coolant jet nozzle 21 is, for example, an elliptical shape. However, the shape of the coolant jet nozzle 21 is not limited to this.
- the planar shape of the coolant jet nozzle 21 may be, for example, a rectangular shape.
- the coolant has a flat shape along the cutting edge 43 and in the vicinity of the cutting edge 43 Supplied. As a result, the coolant can easily enter between the cutting edge 43 and the chips. Therefore, in this case, the chip crushing effect by the coolant can be further enhanced.
- SYMBOLS 1 Holder main body 1a 1st end, 1b 2nd end, 1c 1st surface, 1d 2nd surface, 11 seating surface, 12 screw hole, 13 insertion part, 14 1st flow path, 15 coolant spout, 16 3rd Flow path, 2 pressing member, 2a tip, 2b base end, 21 coolant jet, 22 coolant inlet, 23 coolant reservoir, 24 second flow path, 24a first end, 24b second end, 25 through hole, Reference Signs List 3 fixing member, 4 cutting insert, 41 rake face, 42 flank face, 43 cutting edge, 5 washer, A1, A2, A3 cross sectional area, CP intersection point, EL1 first extension line, EL2 second extension line, FP fixing position, L1 first straight line, L2 second straight line, L3 straight line, W1 first width, W2 second width.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
切削の際に、被削材から切り出される切屑は、切れ刃からすくい面側に向かう。そのため、クーラントによる切屑破砕効果を得るためには、クーラントは、すくい面側から切れ刃に供給されることが好ましい。しかしながら、特許文献1に記載の刃先交換式バイトにおいては、クーラントは逃げ面側から切れ刃に供給されることになる。
本開示の一態様に係る切削工具用ホルダによると、剛性を確保しながら切削インサートのすくい面側から切れ刃にクーラントを供給することができる。
まず、本開示の実施態様を列記して説明する。
次に、本開示の実施形態の詳細を、図面を参照して説明する。なお、各図中同一又は相当部分には同一符号を付している。また、以下に記載する実施の形態の少なくとも一部を任意に組み合わせてもよい。
以下に、第1実施形態に係る切削工具用ホルダの構成を説明する。
第1実施形態に係る切削工具用ホルダにおいては、クーラントは、ホルダ本体1の内部に設けられた第1流路14並びに押さえ部材2の内部に設けられたクーラント溜まり23及び第2流路24を介して、クーラント噴出口21から噴出されて、切削インサート4に供給される。そのため、第1実施形態に係る切削工具用ホルダにおいては、クーラントをすくい面41側から切れ刃43に供給することができる。
以下に、第2実施形態に係る切削工具用ホルダを説明する。なお、以下においては、第1実施形態に係る切削工具用ホルダと異なる点を主に説明し、重複する説明は繰り返さないものとする。
Claims (7)
- すくい面と、前記すくい面に連なる逃げ面と、前記すくい面と前記逃げ面との境界を成す稜線により構成される切れ刃とを有する切削インサートを支持する切削工具用ホルダであって、
前記切削インサートが載置される着座面を有するホルダ本体と、
前記着座面に載置される前記切削インサートを前記ホルダ本体に位置決めして固定するための押さえ部材と、
前記押さえ部材を前記ホルダ本体に固定する固定部材とを備え、
前記押さえ部材は、前記着座面側に載置される前記切削インサートの前記切れ刃に近い方の端部である先端部と、前記着座面に載置される前記切削インサートの前記切れ刃から遠い方の端部である基端部とを有し、
前記先端部には、クーラントが噴出する第1クーラント噴出口が設けられ、
前記ホルダ本体の内部には、前記クーラントが流れる第1流路が設けられ、
前記押さえ部材の内部には、前記押さえ部材が前記ホルダ本体に固定されたときに前記第1流路に接続されるとともに前記第1流路から供給される前記クーラントを貯留するクーラント溜まりと、前記クーラント溜まりに貯留された前記クーラントを前記第1クーラント噴出口に供給する第2流路とが設けられ、
前記クーラント溜まりは、前記第1流路及び前記第2流路よりも前記クーラントの流れ方向に直交する断面における断面積が大きく、
前記クーラント溜まりは、前記先端部から前記基端部に向かう方向において、前記押さえ部材が前記ホルダ本体に固定される位置よりも前記基端部側に配置される、切削工具用ホルダ。 - 前記押さえ部材は、前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て前記基端部から前記先端部に向かう方向に平行かつ前記固定部材に接する直線に関して前記固定部材と反対側に位置する部分においてのみ、前記ホルダ本体に接触する、請求項1に記載の切削工具用ホルダ。
- 前記第2流路の前記クーラントの流れ方向に直交する断面における断面積は、前記クーラント溜まりから前記第1クーラント噴出口に向かうにしたがって小さくなる、請求項1又は請求項2に記載の切削工具用ホルダ。
- 前記クーラントの噴出方向に垂直かつ前記着座面に載置される前記切削インサートの前記すくい面に平行な方向における前記第1クーラント噴出口の幅は、前記着座面に載置される前記切削インサートの前記すくい面に垂直方向における前記第1クーラント噴出口の幅よりも大きい、請求項1~請求項3のいずれか1項に記載の切削工具用ホルダ。
- 前記第2流路は、前記クーラントの噴出方向に垂直かつ前記着座面に載置される前記切削インサートの前記すくい面に平行な方向における前記第2流路の端である第1端と、前記第1端の反対側の端である第2端とを有し、
前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て前記第1端を示す直線を前記第1クーラント噴出口から延長した第1延長線と、前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て前記第2端を示す直線を前記第1クーラント噴出口から延長した第2延長線とは、前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て、前記着座面に載置される前記切削インサートの前記切れ刃と重なる位置において交差する、請求項1~請求項4のいずれか1項に記載の切削工具用ホルダ。 - 前記第2流路は、前記クーラントの噴出方向に垂直かつ前記着座面に載置される前記切削インサートの前記すくい面に平行な方向における前記第2流路の端である第1端と、前記第1端の反対側の端である第2端とを有し、
前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て前記第1端を示す直線を前記第1クーラント噴出口から延長した第1延長線と、前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て前記第2端を示す直線を前記第1クーラント噴出口から延長した第2延長線とは、前記着座面に載置される前記切削インサートの前記すくい面に垂直な方向から見て、前記切れ刃からずれた位置において交差する、請求項1~請求項4のいずれか1項に記載の切削工具用ホルダ。 - 前記ホルダ本体には、前記着座面に載置される前記切削インサートの前記逃げ面側から前記切削インサートの前記切れ刃へ前記クーラントを噴出する第2クーラント噴出口が設けられ、
前記ホルダ本体の内部には、前記第2クーラント噴出口に前記第1流路を流れる前記クーラントを供給する第3流路が設けられる、請求項1~請求項6のいずれか1項に記載の切削工具用ホルダ。
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