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WO2019145335A1 - Porte-outil et système porte-outil ainsi que procédé d'usinage - Google Patents

Porte-outil et système porte-outil ainsi que procédé d'usinage Download PDF

Info

Publication number
WO2019145335A1
WO2019145335A1 PCT/EP2019/051578 EP2019051578W WO2019145335A1 WO 2019145335 A1 WO2019145335 A1 WO 2019145335A1 EP 2019051578 W EP2019051578 W EP 2019051578W WO 2019145335 A1 WO2019145335 A1 WO 2019145335A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
plane
free surface
coolant
receiving portion
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/EP2019/051578
Other languages
German (de)
English (en)
Inventor
Matthias Bauz
Uwe Bölke
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.)
MAS GmbH
Original Assignee
MAS GmbH
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
Application filed by MAS GmbH filed Critical MAS GmbH
Publication of WO2019145335A1 publication Critical patent/WO2019145335A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/02—Cutting tools with straight main part and cutting edge at an angle
    • 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
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04—Tool holders for a single cutting tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2250/00—Compensating adverse effects during turning, boring or drilling
    • B23B2250/12—Cooling and lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2250/00—Compensating adverse effects during milling
    • B23C2250/12—Cooling and lubrication

Definitions

  • the present invention relates to a tool holder for a
  • Tool for machining a workpiece in particular for a
  • a turning tool for turning comprising a shank portion having a chucking end and a tool end, having a tool receiving portion connected to the shank
  • Tool end is connected, and on which a tool can be fixed, wherein the tool receiving portion defines a horrschnei- the plane and an open-plane for a tool thereon, wherein a supply channel for coolant is integrated in the tool holder and wherein via the supply channel, a coolant toward the Tool receiving portion is feasible to cool a tool fixed thereto.
  • the present invention relates to a tool system with such a tool holder and with a tool attached thereto.
  • the present invention relates to a method for machining a workpiece, in particular by means of a tool system of the type mentioned, with the steps to produce a relative movement between a workpiece and a tool, wherein the tool has a tool cutting edge, and wherein on the Tool an open space is formed, wherein the
  • Tool is brought into engagement with the workpiece, and wherein cooling means for cooling the tool is provided.
  • Typical methods for machining workpieces of the type described above include turning, milling, grinding, but also drilling, sawing, broaching, honing or lapping.
  • the energy used is at least partially, but typically predominantly converted into heat energy.
  • the tool wear can be reduced.
  • an improved dimensional accuracy of the workpieces can be achieved.
  • the surface quality of the workpieces can be improved.
  • a chip removal can be supported, and the heat load for the machine tool can possibly also be reduced.
  • the coolant which may also be referred to as a cooling lubricant, may be a mineral oil-based coolant, but may also be water, the corrosion inhibiting additives are optionally added. Also emulsions of water-miscible mineral oils and water are known, wherein the proportion of mineral oil is typically less than 10%. Furthermore, the refrigerants typically include a variety of additives.
  • the coolant is typically supplied at a flow rate of 10 to 100 l / min.
  • the volume flow can also be less than 50 ml / h. The volume flow in the case of minimum quantity lubrication lies between these limit values.
  • Tool holder which can also be referred to as a clamping holder in connection with rotary tools, serve on the one hand for fixed and referential clamping of the tool system. On the other hand, they have a tool receiving section for receiving a replaceable tool which can be fixed to the tool holder.
  • the tool can for example be an insert, in particular special an indexable insert.
  • the inserts usually have several cutting edges. By turning and / or turning the cutting edges can each be brought into a working position.
  • Cutting inserts are made of cermets
  • Cutting ceramic made of CBN (cubic drill nitrite) or made of diamond.
  • the clamping of the tool to the tool holder can be done via a hole with a screw, a bore with toggle, a clamping finger or a bore and clamping fingers.
  • Tool holder to integrate a supply channel for coolant.
  • the feed channel can be drilled in the material of the tool holder.
  • the integration can be carried out by attaching a coolant supply accessory to the tool holder. It is also known to direct the supplied via an integrated feed channel coolant to the rake face to cool the tool.
  • the cooling of the tool in the present case should also include that the area around the tool and / or the engagement between the tool and the workpiece is cooled.
  • cooling should also include lubrication alternatively or additionally.
  • the above object is achieved with the tool holder mentioned above in that the feed channel is connected to an outlet channel through which the coolant can be guided to a region of the free surface level, which corresponds to a free space of the tool with a fixed tool. Furthermore, the above object is achieved by a tool system with a tool holder according to the invention and a tool fixed thereto.
  • the tool system comprising the steps of (i) generating a relative movement between a workpiece and a tool, wherein the tool has a tool cutting edge and wherein a free surface is formed on the tool, (ii) the tool is engaged on the workpiece and (iii) direct coolant to the open area.
  • the tool receiving portion is preferably designed in the tool holder according to the invention that a tool in a certain position is replaceable therein in which the tool at least one aligned transversely to a top side rake face cutting surface and an aligned transversely to the cutting surface free face are exposed So are accessible from the outside with inserted tool.
  • the cutting surface is a surface parallel to a cutting edge of the tool adapted to engage the workpiece.
  • the cutting edge can also be referred to as the main cutting edge.
  • the transverse to the cutting surface and the cutting plane i. at an angle of more than 0 ° and less than or equal to 180 °, in particular less than or equal to 90 °, aligned free surface plane is generally parallel to an edge of the
  • Open plane and the rake surface is defined, preferably at least adjacent to the cutting edge not designed for cutting machining. At the end remote from the cutting edge of this open-space edge turn in the clamped state not coming into engagement cutting edge may be formed, depending on the basic shape of the cutting plate, which may be formed in particular as an indexable insert.
  • the tool can be fixed on the tool holder to a multiplicity of different clamping types, for example by means of clamping with a clamping finger, via a bore, via a toggle lever tension, a combination thereof, etc.
  • Free surface plane is preferably less than / equal to 90 ° and preferably greater than 15 °.
  • the shank portion is preferably polygonal in cross-section, in particular quadrangular, preferably square.
  • the clamping end of the shaft portion can be clamped to a machine tool in a number of different ways.
  • the feed channel preferably extends from the clamping end to the tool end of the shank portion and there goes over into the outlet channel.
  • the feed channel may be connected to a plurality of exit passages for directing coolant from a number of different directions to the tool or engagement area between the tool and the workpiece.
  • the outlet channel defines a beam axis which at an angle in a range of 0 ° to 20 °, in particular a range of 0 ° -3 °, preferably in a range of greater than 0 ° -3 ° in Is aligned with respect to the free surface plane.
  • the coolant is therefore preferably directed at an acute angle to the free surface, preferably in the direction of the edge which is defined by the cutting edge plane and the plane of the free surface.
  • the exit channel defines a beam axis which extends at an angle in a range of 3 ° to 45 °, preferably in a range of 0 ° -90 °, in particular in a range of 15 ° -45 ° °, preferably in a range of 25 ° -35 ° with respect to a tool reference plane, which is defined over the tool receiving portion.
  • the tool reference plane is usually a plane that is aligned parallel to the chip surface, so preferably transverse to both
  • the coolant is directed at an acute angle with respect to the tool reference plane to the free surface of an inserted tool, which in particular a rejection of chips can be supported.
  • outlet channel is oriented such that coolant emerging therefrom is directed generally obliquely upwards.
  • the rake face is generally referred to as the upper surface of the
  • An outlet opening of the outlet channel is therefore preferably below the tool reference plane, which is defined by the tool or the tool receiving section.
  • the outlet channel defines an outlet opening from which the coolant emerges, wherein the outlet opening is arranged below a tool support surface of the tool receiving section.
  • the outlet opening is consequently arranged on a side of the tool support surface opposite the tool reference plane.
  • the tool receiving portion has an open space side associated with the free surface, wherein on the free surface side, a dome portion is formed, with respect to the free surface of the plane
  • Tool receiving portion protrudes and on which an outlet opening of the Austrittska- is arranged.
  • the tool holder defines a feed direction along which the tool holder is advanced in a machining operation, wherein a cutting corner lies in a cutting line of the tool cutting plane and the free surface plane, and wherein the tool receiving portion is formed such that the cutting corner of a in the tool receiving portion specified
  • Tool lies in the feed direction in front of an outlet opening of the outlet channel.
  • the feed direction is preferably a main feed direction.
  • the free surface plane is preferably the free surface plane in the skin advancement direction.
  • the outlet opening of the outlet channel preferably does not protrude out of the free surface plane or is not in the feed direction opposite to this.
  • a flat turning can be performed with the tool holder and a tool inserted therein, which would not work if the exit opening of the exit channel would protrude out of the free surface plane.
  • Tool receiving portion to a tool reference plane associated reference plane side, wherein on the reference plane side, another dome portion is formed, which protrudes from a clamping surface defined by the tool receiving portion and to which a further outlet opening of a further Austrittska- is arranged, wherein from the further outlet channel escaping coolant the rake surface is directed or directed.
  • the further outlet channel has a further channel or beam axis, which is aligned at an acute angle with respect to the rake surface and / or the tool reference plane.
  • the tool holder may be formed for a variety of different tools, such as a milling tool, for a drilling tool, etc. It is particularly preferred, however, if the tool is a turning tool.
  • Fig. 1 is a schematic side view of a machine tool with a
  • FIG. 2 is a plan view of the tooling system of Fig. 1;
  • FIG. 3 shows a further side view of the tool system of FIGS. 1 and 2 on one side of the side view shown in FIG. 1;
  • FIG. 4 is a side view of another embodiment of a tooling system according to one embodiment of the present invention.
  • Fig. 5 is a plan view of the tooling system of Fig. 4;
  • FIGS. 4 and 5 shows an exploded view of a tool receiving section and a tool of the tool system of FIGS. 4 and 5;
  • FIG. 8 shows a plan view corresponding to FIG. 5 of the tool receiving section with a tool fastened thereto by means of a claw;
  • FIG. 9 is a side view of another embodiment of a
  • Fig. 10 is a plan view of the tooling system of Fig. 9;
  • Fig. 11 is a perspective view of a tool receiving portion and a tool of the tooling system of Figs. 9 and 10;
  • FIG. 13 shows a plan view corresponding to FIG. 10 of the tool receiving section with a tool fastened thereto by means of a claw.
  • a machine tool is shown in schematic form and generally designated 10.
  • the machine tool 10 has a workpiece clamping device 12, by means of which a workpiece 14 can be clamped and by means of which the workpiece 14 can be driven to rotate about a rotation axis 16.
  • the machine tool 10 further includes a tool holder 18 which is clamped in a workpiece clamping device 20.
  • the axis of rotation 16 is aligned along a z-axis.
  • the tool holder 18 is mounted movably by means of the workpiece clamping device 20 at least in an x-axis and in a y-axis.
  • the machine tool 10 is a lathe, by means of which the workpiece 14 can be machined in rotation.
  • FIG. 3 schematically shows that the turning process takes place in the feed direction V on an outer surface of the workpiece 14. In the same way, the turning process can take place on an inner surface.
  • the tool holder 18 has a shank portion 24 extending along a longitudinal axis 26.
  • the longitudinal axis 26 is aligned transversely to the axis of rotation 16.
  • the shank portion 24 has an unspecified clamping end, by means of which the shank portion 24 can be clamped in the workpiece clamping device 20.
  • the shank portion 24 has an unspecified tool end, which merges into a tool receiving portion 28 of the tool holder 18.
  • a tool 30 is inserted and releasably fixed thereto.
  • the tool 30 is a turning tool, in particular a cutting plate, preferably a turning plate.
  • the tool 30 defines a tool reference plane 32 which is aligned substantially parallel to the longitudinal axis 26.
  • the tool receiving portion 28 has at least one tool support surface 34, which is typically aligned parallel to the tool reference plane 32. Furthermore, the
  • Tool receiving portion 28 a tool abutment surface 36 which transversely to the
  • Tool reference plane 32 and / or transverse to the longitudinal axis 26 is aligned.
  • the tool is polygonal in plan view, for example, triangular, but preferably square, in particular rhombic.
  • the tool 30 is shown as irregular polygonal.
  • the tool 30 is preferably regularly polygonal, that is to say in particular rhombic, trapezoidal, rectangular or square.
  • the tool 30 has a tool cutting edge 40 which is formed by an edge of the tool 30 facing away from the shank portion 24 of the tool holder 18.
  • the tool cutting edge 40 which can also be referred to as a tool main cutting edge, is aligned parallel to a cutting surface 41, which in one
  • Tool cutting plane 44 is located and ends in a cutting edge 42.
  • the tool 30 further has an open-space edge 48, which converges in the cutting edge 42 with the cutting tool 40.
  • the free surface edge 48 is located in an open space 50 of the tool 30.
  • the free surface 50 is located in a
  • Open-plane 52 which at an angle equal to or less than 90 ° with respect to
  • Tool cutting plane 44 is aligned and which is the free surface level in the main feed direction.
  • An upper side of the tool 30 forms a rake surface 54.
  • the free surface 50 merges with the flank surface 54 via the flank edge 48.
  • the cutting surface 41 passes over the tool cutting edge 40 into the clamping surface 54.
  • the shank portion 24 has a reference plane side 57, which is aligned approximately parallel to the tool reference plane 32.
  • a first dome portion 58 is formed which projects upwardly relative to the reference plane side 57 and the tool reference plane 32 and the rake surface 54.
  • the shank portion 24 further has an open-face side 59, which is associated with the free surface plane 52 and extends parallel or at an acute angle thereto.
  • a second dome portion 60 is formed on the free surface side 59, which is preferably adjacent to the reference plane side 57.
  • the second dome section 60 protrudes laterally with respect to the free surface side 59 and also projects laterally with respect to the free surface plane 52.
  • the tool holder 18 also has a coolant device 64.
  • the coolant device 64 includes a supply channel 66 in the shank portion 24, the supply channel 66 extending from the chuck end toward the tool end.
  • the tool clamping device 20 is designed so that coolant in the region of the tool clamping device 20 can be fed into the feed channel 66.
  • the machine tool 10 includes a coolant supply device for this purpose.
  • the feed channel 66 is connected to a first outlet channel 38 in the interior of the tool holder 18.
  • the first outlet channel 68 is formed within the first dome section 58 and has a first outlet opening 72, via which a first coolant jet 70 can be directed onto the tool 30, namely at an acute angle to its rake face 54, as can be seen in particular in FIG is.
  • the first outlet channel 68 is connected to the feed channel 66 in the interior of the tool holder 18.
  • the feed channel 66 is further connected in the interior of the tool holder 18 with a second outlet channel 74.
  • the second outlet channel lies within the second dome section 60 and has a second outlet opening 78, via which a second coolant jet 76 can be directed onto the tool 30, namely at an acute angle to the free surface 50, as can be seen in FIG.
  • the second exit channel 74 is aligned along a second beam axis 80, which is aligned at an acute angle to the free surface plane 52.
  • the first outlet channel 68 is aligned along a first beam axis, which is not designated in detail in FIGS. 1 to 3.
  • the tool holder defines the feed direction V, along which the tool holder 18 is moved in a machining, wherein in a section line of the cutting plane 44 and the plane of the plane 52, the cutting edge 42 is located, and wherein the tool receiving portion 28 is formed so that the cutting edge 42 of a located in the tool receiving portion 28 tool 30 in the feed direction V in front of the second outlet opening 78 of the second e-exit channel 74.
  • the machining can also be done in hard to reach places.
  • the second beam axis 80 may be aligned approximately parallel to the tool reference plane 32, as can be seen in particular in Fig. 3. Preferably, however, the second beam axis 80 is aligned at an acute angle to the tool reference plane 32, from bottom to top. In this case, the second outlet opening 78 is preferably located below the tool support surface 34 or on a side of the tool support surface 34 opposite the tool 30.
  • the coolant exiting via the second outlet opening 78 can be used efficiently for cooling / lubricating the tool 30.
  • a rejection of chips from the engagement area between the tool 30 and workpiece 14 can also be supported in an advantageous manner.
  • FIGS. 4 to 8 A further embodiment of a tool holder is shown in FIGS. 4 to 8 and designated generally by 18 '.
  • the tool holder 18 ' corresponds in terms of structure and operation generally to that shown in FIGS. 1 to 3
  • Tool holder 18 'of Fig. 1 to 6 the tool 30 is fixed via a bore with a clamping screw.
  • an intermediate layer 84 is first placed on the tool receiving portion 28 ', whose shape corresponds to that of the workpiece 30 in plan view.
  • the intermediate layer 84 is fixed to the tool holder 18 'by means of a clamping screw insert 86.
  • the tool 30 is placed and this is screwed by means of a clamping screw 88 in the clamping screw insert 86.
  • the type of clamping is also referred to as clamping type "S" ("screw-on").
  • the second beam axis 80 is aligned at an angle a with respect to the plane of the open plane 52.
  • the angle a is preferably in a range of 0 ° -20 °.
  • the second beam axis 80 is aligned at an angle ⁇ with respect to the tool reference plane 32.
  • the value of ⁇ is preferably in a range of 0 ° -90 °.
  • FIG. 7 is an orthogonal view of the free surface plane 52 such that whose normal vector protrudes perpendicularly from the plane of the drawing.
  • Fig. 8 is a view perpendicular to the tool reference plane 32 so that its normal vector protrudes perpendicularly from the plane of the drawing. It can be seen that the angle ⁇ is preferably greater than the angle a. This ratio also applies to all the above and below embodiments.
  • the angle a is 0 °, although the angle a is in many cases greater than 0 °.
  • Figs. 9 to 13 is another embodiment of a
  • Tool holder 18 " which generally corresponds in terms of construction and operation to the tool holder 18 of Figures 1 to 3 and the same elements are therefore designated by like reference numerals.
  • the tool holder 18 " has a tool 30 which is attached to the tool holder 18" after the clamping system "T".
  • the clamping takes place via a clamping screw 88 ", which is aligned offset parallel to a central axis of the workpiece 30, and via a clamping lever or toggle 92, which engages below the tool 30 in a radial groove of the clamping screw 88".
  • Fig. 11 it can be seen that the second beam axis 80 "at an angle a" of 0 ° -20 ° with respect to the free surface plane 52 is aligned. Furthermore, it can be seen in FIG. 9 that the second beam axis 80 is aligned at an angle ⁇ with respect to the tool reference plane 32, wherein the value of ⁇ may be in a range of 0 ° -90 °.
  • the tool reference plane 32 is preferably aligned at an angle greater than zero to the longitudinal axis 26 of the shaft section 24.
  • FIGS. 12 and 13 the above-described angles are shown once again more clearly. As in the previous embodiments, the value of a "is less than ⁇ .

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

Abstract

L'invention concerne un porte-outil (18) d'un outil (30) servant à l'usinage d'une pièce (14), notamment pour un outil de rotation pour tourner, pourvu d'une partie d'arbre (24) qui comporte une extrémité de serrage et une extrémité d'outil, d'une partie de réception d'outil (28) qui est reliée à l'extrémité d'outil et qui peut être fixée sur l'outil (30), la partie de réception d'outil (28) définit un niveau de tranchants d'outil (44) et un niveau d'espace disponible (52) pour un outil (30) pouvant y être fixé. Un canal d'alimentation (66) pour fluide de refroidissement est intégré dans le porte-outil (18). Un fluide de refroidissement peut être guidé par le canal d'alimentation (66) en direction de la partie de réception d'outil (28), pour pouvoir refroidir un outil (30) pouvant y être fixé. Le canal d'alimentation (66) est relié à un canal de sortie (76) par lequel le fluide de refroidissement peut être guidé sur une zone du niveau d'espace disponible (52), qui correspond, lorsque l'outil (30) est fixé, à une surface libre (46) de l'outil (30).
PCT/EP2019/051578 2018-01-25 2019-01-23 Porte-outil et système porte-outil ainsi que procédé d'usinage Ceased WO2019145335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018101637.9A DE102018101637A1 (de) 2018-01-25 2018-01-25 Werkzeughalter und Werkzeugsystem sowie Zerspanungsverfahren
DE102018101637.9 2018-01-25

Publications (1)

Publication Number Publication Date
WO2019145335A1 true WO2019145335A1 (fr) 2019-08-01

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PCT/EP2019/051578 Ceased WO2019145335A1 (fr) 2018-01-25 2019-01-23 Porte-outil et système porte-outil ainsi que procédé d'usinage

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DE (1) DE102018101637A1 (fr)
WO (1) WO2019145335A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114786848A (zh) * 2019-10-07 2022-07-22 穆里投资管理公司 用于切削加工的切削工具和方法以及用于切削工具的加工头

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0825110A (ja) * 1994-07-08 1996-01-30 Toshiba Tungaloy Co Ltd 旋削工具
JPH0871813A (ja) * 1994-09-06 1996-03-19 Unisia Jecs Corp 切削工具
EP3059034A1 (fr) * 2013-10-18 2016-08-24 NGK Sparkplug Co., Ltd. Porte-outil et outil de coupe
DE102015219786A1 (de) * 2015-10-13 2017-04-13 Schaeffler Technologies AG & Co. KG Hartbearbeitungseinrichtung und Verfahren zur Hartbearbeitung eines Werkstoffs unter Einsatz einer solchen Hartbearbeitungseinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014119295B4 (de) * 2014-12-19 2023-08-10 Kennametal Inc. Werkzeughalter für einen Schneideinsatz sowie Verfahren zur Herstellung des Werkzeughalters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0825110A (ja) * 1994-07-08 1996-01-30 Toshiba Tungaloy Co Ltd 旋削工具
JPH0871813A (ja) * 1994-09-06 1996-03-19 Unisia Jecs Corp 切削工具
EP3059034A1 (fr) * 2013-10-18 2016-08-24 NGK Sparkplug Co., Ltd. Porte-outil et outil de coupe
DE102015219786A1 (de) * 2015-10-13 2017-04-13 Schaeffler Technologies AG & Co. KG Hartbearbeitungseinrichtung und Verfahren zur Hartbearbeitung eines Werkstoffs unter Einsatz einer solchen Hartbearbeitungseinrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114786848A (zh) * 2019-10-07 2022-07-22 穆里投资管理公司 用于切削加工的切削工具和方法以及用于切削工具的加工头

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