Cutting head, tool shank, and cutting tool having rotationally asymmetric coupling pins

Abstract

The cutting tool (20) includes a cutting head (22) and a tool shank (24), each having axial contact surfaces (66, 76a). One of the cutting head (22) and the tool shank (24) includes a coupling pin (38), while the other includes a pin receiver (80) and a fastening through-hole (96) opening into the pin receiver. The coupling pin (38) has an engagement groove (52), and the pin receiver has an engagement ridge (90). The coupling pin is received into the pin receiver. The cutting head and the tool shank are releasably mounted together by a fastening member passing through the fastening through-hole, so that the engagement groove abuts against the engagement ridge with respect to the coupling pin, and the axial contact surfaces on each part abut against each other.

Description

[Technical Field]

[0001] The subject matter of the present invention relates to a cutting tool having two releasably mounted components, namely a cutting head having a releasably mounted cutting insert and a tool shank, more particularly to a location of one of these components having a coupling pin, and more particularly to a location where the two components are releasably mounted together by a fastening member acting on the coupling pin. [Background technology]

[0002] A cutting tool may include a coupling mechanism for securely attaching a cutting head, having a releasably mounted cutting insert, to a tool shank. Typically, such a coupling mechanism includes a coupling pin that can be received into a pin receiver. Furthermore, to securely attach the cutting head to the tool shank, the cutting tool may include a fastening member that acts on the coupling pin. An example of such a cutting tool is disclosed, for example, in US2020 / 198020, which discloses a tool holder having a tool holder body, where the tool rest for fixing the tool is formed on the tool holder body, and the tool holder connection portion for fixing the tool holder to the holder shaft is formed on the tool holder body. The tool holder connection portion includes a tool holder cone section and a tool holder cylindrical section, where the tool holder cone section has a polygonal cross-section and engages with a corresponding polygonal holder shaft cone section to establish a tangentially defined relative position between the tool rest and the holder shaft, and the tool holder cylindrical section may act together with the corresponding holder shaft cylindrical section.

[0003] In some such cutting tools, the coupling pin is non-cylindrical. An example of such a cutting tool is disclosed, for example, in DE102019111843B4, which discloses an interchangeable head, consisting of an insertion rod that can be inserted into an insertion opening of a tool holder. The insertion opening has a corner or elliptical shape, and the insertion rod is designed to fit snugly into the insertion opening. [Overview of the project] [Problems that the invention aims to solve]

[0004] One objective of the subject matter of this invention is to provide a new and improved coupling between the cutting head and the tool shank that is quick and easy to assemble, and also to provide secure attachment of the cutting head to the tool shank. [Means for solving the problem]

[0005] According to a first aspect of the subject matter of the present application, a cutting tool is provided having a tool central axis defining opposite forward and backward directions, the cutting tool is, It is a cutting head, The outer circumferential surface of the head extends circumferentially around the central axis of the tool and forms the boundary of the rearward-facing first head end face. A head axial contact surface located at the first head end face, and Insert pocket A cutting head equipped with, It is a tool shank, The outer circumferential surface of the shank extends circumferentially around the central axis of the tool and forms the boundary of the forward-facing first shank end face. Shank axial contact surface located on the first shank end face A tool shank equipped with, A coupling pin protruding from one of the first head end face and the first shank end face, The outer surface of the pin extending around the central axis of the pin, The pin perpendicular axis, which is perpendicular to the pin's central axis and intersects with it, defines the pin's perpendicular plane. A pin engagement groove is formed in a recess on the outer surface of the pin and extends along the longitudinal axis of the groove from the free end of the pin toward the fixed end of the pin, and A tightening recess is formed in the recess on the outer surface of the pin opposite the pin engagement groove, around the central axis of the pin. A coupling pin equipped with, A pin receiver formed in the other recess of the first head end face and the first shank end face, The inner circumferential surface of the receiver extending around the central axis of the receiver, A vertical axis of the receiver that is perpendicular to the central axis of the receiver and intersects with the central axis of the receiver, thereby defining the vertical plane of the receiver, and A receiving engagement ridge protrudes from the inner circumferential surface of the receiving and extends along the lateral axis of the ridge from the receiving open end to the receiving bottom end. A pin receiver equipped with, fastening through hole and The clamping through-hole is formed in either the outer circumferential surface of the head or the outer circumferential surface of the shank, where the pin receiver is formed in a recess, and opens to the pin receiver at the receiving through-hole opening located on the opposite side of the receiving engagement protrusion around the receiving central axis. The cutting tool is adjustable between a released position and a locked position, and in the locked position, The coupling pin is received into the pin receiver. The fastening member passes through the tightening through hole and into the tightening recess of the connecting pin, The pin engagement groove contacts the receiving engagement protrusion, The head axial contact surface contacts the shank axial contact surface, The cutting head and tool shank are mounted together in a releasable manner. It acts in such a way.

[0006] According to a second aspect of the subject matter of the present application, a cutting head is provided having a head central axis defining opposite forward and backward directions, the cutting head, The outer circumferential surface of the head extends circumferentially around the central axis of the head and forms the boundary of the rearward-facing first head end face, A head axial contact surface located on the first head end face, Insert pockets and, A coupling pin protruding from the first head end face, The outer surface of the pin extending around the central axis of the pin, The pin perpendicular axis, which is perpendicular to the pin's central axis and intersects with it, defines the pin's perpendicular plane. A pin engagement groove is formed in a recess on the outer surface of the pin and extends along the longitudinal axis of the groove from the free end of the pin toward the fixed end of the pin, and A tightening recess is formed in the recess on the outer surface of the pin opposite the pin engagement groove, around the central axis of the pin. A coupling pin comprising, or A pin receiver formed in a recess on the first head end face, An inner circumferential surface of the receiver extending around the receiver central axis, A receiver vertical axis that is orthogonal to the receiver central axis and intersects the receiver central axis to define a receiver vertical plane, and A receiver engaging ridge protruding from the inner circumferential surface of the receiver and extending from the open end of the receiver towards the bottom end of the receiver along the longitudinal axis of the ridge A pin receiver comprising Either of, A tightening through-hole Comprising, the tightening through-hole is a receiver through-hole opening located on the opposite side of the receiver engaging ridge around the receiver central axis, formed in a recess on the outer circumferential surface of the head, and opening to the pin receiver.

[0007] According to a third aspect of the subject matter of the present application, a tool shank having a shank central axis defining opposite forward and rearward directions is provided, the tool shank comprising A shank outer circumferential surface extending circumferentially around the shank central axis and forming a boundary of the forward first shank end face, and A shank axial contact surface located on the first shank end face, and A coupling pin protruding from the first shank end face, A pin outer circumferential surface extending around the pin central axis, A pin vertical axis that is orthogonal to the pin central axis and intersects the pin central axis to define a pin vertical plane, A pin engaging groove formed in a recess on the pin outer circumferential surface and extending from the free end of the pin towards the fixed end of the pin along the longitudinal axis of the groove, and A tightening recess formed in a recess on the pin outer circumferential surface on the opposite side of the pin engaging groove around the pin central axis A coupling pin comprising, or A pin receiver formed in a recess on the first shank end face, An inner circumferential surface of the receiver extending around the receiver central axis, A receiver vertical axis that is orthogonal to the receiver central axis and intersects the receiver central axis to define a receiver vertical plane, and A receiving engagement ridge protrudes from the inner circumferential surface of the receiving and extends along the lateral axis of the ridge from the receiving open end to the receiving bottom end. Equipped with a pin receiver One of the following, fastening through hole and The clamping through-hole is a receiving through-hole opening located on the opposite side of the receiving engagement protrusion around the receiving central axis, formed in a recess on the outer surface of the shank, and opening into the pin receiver.

[0008] The above is a summary, and it should be understood that the features described below can be applied to the subject matter of this application in any combination, for example, any of the following features can be applied to the cutting head, tool shank, or cutting direction.

[0009] The coupling pin may protrude from the first head end face. The pin receiver may be placed in a recess on the first shank end face. The clamping through hole may be formed within the outer circumferential surface of the shank.

[0010] The pin engagement groove may include a groove-concave curved portion extending along the longitudinal axis of the groove. The receiving engagement protrusion may include a protruding curved portion extending along the longitudinal axis of the protrusion. In the locked position, the groove-concave curved portion may abut against the protruding curved portion.

[0011] The cutting tool may comprise a coupling pin located at a single center and a pin receiver located at a single center.

[0012] A cutting tool may comprise a strictly single fastening member and a strictly single clamping through-hole for securing the cutting head to the tool shank. A coupling pin may comprise a strictly single clamping recess.

[0013] The fastening through-hole may have a female threaded portion. The fastening member may have a male threaded portion. In the locking position, the male threaded portion can be screwed into the female threaded portion.

[0014] The cutting tool may be equipped with complementary fastening screws. The cutting head may be equipped with a head fastening through-hole formed in a recess on the second head end face and opening to the first head end face. The tool shank may be equipped with a shank fastening screw hole formed in a recess on the first shank end face. In the locked position, the complementary fastening screws are located in the head fastening through-hole and can be screwed into the shank fastening screw hole.

[0015] The cutting head and tool shank may have the same hardness.

[0016] The coupling pin may protrude from the first shank end face. The pin receiver may be placed in a recess on the first head end face. The clamping through hole may be formed within the outer circumferential surface of the head.

[0017] The coupling pin may protrude from the first head end face.

[0018] The plane perpendicular to the pin may intersect with the pin engagement groove. The pin engagement groove may exhibit mirror asymmetry with respect to the plane perpendicular to the pin.

[0019] The pin engagement groove may have two opposite groove sides, which are inclined inward in the opposite width direction of the pin engagement groove such that the groove sides converge toward each other.

[0020] The two groove sides can intersect each other.

[0021] The pin engagement groove may include a groove-concave curved portion, which extends along the longitudinal axis of the groove and connects the two groove sides.

[0022] The grooved, concave curved portion can be defined by a certain groove radius. The groove radius can be between 2.8 mm and 3.6 mm.

[0023] The pin engagement groove may have a certain groove depth. The groove depth may be 0.3 mm or more and 0.7 mm or less.

[0024] The groove depth can be kept constant along the longitudinal axis of the groove.

[0025] The pin engagement groove may have a certain groove width. The groove width may be 5.0 mm or more and 5.84 mm or less.

[0026] The groove width can be kept constant along the longitudinal axis of the groove.

[0027] The pin engagement groove may extend longitudinally along the entire axial range of the coupling pin.

[0028] The longitudinal axis of the groove can be parallel to the pin's central axis.

[0029] The cutting head may further include a head coolant passage having a head coolant passage inlet and a head coolant passage outlet. The coupling pin may have a pin rear surface that is in contact with the outer surface of the pin and the boundary. The head coolant passage inlet may be located on the pin rear surface.

[0030] The pin engagement groove may extend to the rear surface of the pin.

[0031] The cutting head may further comprise a second head end face opposite the first head end face. The cutting head may further comprise a head clamping through hole, which is formed in a recess of the second head end face and opens to the first head end face.

[0032] The outer surface of the pin comprises an opposing upper and lower pin surface, and two opposing pin sides connecting the upper and lower pin surfaces. A clamping recess may be located on the upper pin surface. The clamping recess may include a clamping recess contact surface, which is inclined toward a central pin plane extending through the two opposing pin sides, including the pin central axis, in a direction toward the first head end face.

[0033] The contact surface of the clamping recess may form a certain recess inclination angle with the pin top surface. The recess inclination angle may be 6° or more and 10° or less.

[0034] The insert pocket may have a pocket seat, which is configured to mount a cutting insert, and the pocket seat faces the same direction as the top surface of the pin.

[0035] The pin receiver may be placed in a recess on the first shank end face. The clamping through-hole may be formed within the outer circumferential surface of the shank.

[0036] The receiving vertical plane may intersect with the receiving engagement protrusion. The receiving engagement protrusion may exhibit mirror asymmetry with respect to the receiving vertical plane.

[0037] The receiving engagement protrusion may have two opposite protrusion sides, which are inclined inward in the opposite width direction of the receiving engagement protrusion such that the protrusion sides converge toward each other.

[0038] The sides of the two raised areas can intersect each other.

[0039] The receiving engagement protrusion may have a convex curved portion of the protrusion, which extends along the lateral axis of the protrusion and connects the two sides of the protrusion.

[0040] The raised, convex, curved portion can be defined by a certain radius of convexity of the raised portion. The radius of convexity of the raised portion can be 2.8 mm or more and 3.6 mm or less.

[0041] The receiving engagement protrusion may have a certain protrusion height. The protrusion height may be 0.3 mm or more and 0.7 mm or less.

[0042] The height of the raised portion can be kept constant along the longitudinal axis of the raised portion.

[0043] The receiving engagement protrusion may have a certain protrusion width. The protrusion width may be 5.0 mm or more and 5.84 mm or less.

[0044] The width of the raised portion can be kept constant along the longitudinal axis of the raised portion.

[0045] The receiving engagement protrusion may extend longitudinally along the entire axial range of the pin receiver.

[0046] The axis of the raised section in the direction of the hand can be parallel to the receiving center axis.

[0047] The tool shank may have a shank coolant passage having a shank coolant passage inlet and a shank coolant passage outlet. The pin receiver may have a receiver rear surface that is in contact with the inner circumferential surface of the receiver. The shank coolant passage outlet may be located on the receiver rear surface.

[0048] The tool shank may be provided with a shank tightening screw hole formed in a recess on the first shank end face.

[0049] The clamping through-hole may be inclined away from the first shank end face in the direction from the outer circumferential surface of the shank toward the receiving through-hole opening.

[0050] The fastening through-hole may be inclined at a certain angle with respect to the receiving vertical axis. The hole inclination angle may be between 6° and 10°.

[0051] The receiving engagement protrusion may extend to the first shank end face.

[0052] The fastening through-hole may be equipped with a female threaded portion.

[0053] To better understand this application and to show how it can be actually implemented, please refer to the attached drawings. [Brief explanation of the drawing]

[0054] [Figure 1] This is a perspective view of a cutting tool according to the first embodiment of the present application. [Figure 2] Figure 1 is an exploded perspective view of the cutting tool shown. [Figure 3] Figures 1 and 2 are perspective views of the cutting head. [Figure 4] Figure 3 is a rear view of the cutting head, showing the hidden clamping recess. [Figure 4A] This is a detailed view of Figure 4. [Figure 5] Figure 3 is a front view of the cutting tool. [Figure 6] Figure 3 is a top view of the cutting head. [Figure 7] Figure 3 is a bottom view of the cutting head. [Figure 8] Figure 3 is a side view of the cutting head, showing the head clamping through-hole and head coolant passage of the hidden clamping recess. [Figure 9] Figures 1 and 2 are perspective views of the front end of the tool shank. [Figure 10] Figure 9 is another perspective view of the front end of the tool shank. [Figure 11] Figure 9 is a top view of the front end of the tool shank shown. [Figure 12] Figure 9 is a front view of the tool shank. [Figure 12A] This is a detailed view of Figure 12. [Figure 13] Figure 9 is a side view of the front end of the tool shank, showing the hidden clamping through-hole, shank clamping through-hole, and shank coolant passage. [Figure 14] Figure 9 is a top view of the front end of the cutting tool. [Figure 15] Figure 14 shows a cross-sectional view of the cutting tool taken along the line XV-XV. [Figure 15A] This is a detailed view of Figure 15. [Figure 16] Figure 14 shows a cross-sectional view of the cutting tool taken along the line XVI-XVI. [Figure 17] This is an exploded view of a rotary cutting tool according to a second embodiment of the present application. [Modes for carrying out the invention]

[0055] For the sake of simplicity and clarity, it should be understood that the elements shown in the drawings are not necessarily drawn to a consistent scale. For example, for clarity, the dimensions of some elements may be emphasized relative to others, or several physical components may be included within a single functional block or element. Furthermore, where deemed appropriate, reference numbers may be repeated in the drawings to indicate corresponding or similar elements.

[0056] In the following description, various aspects of the subject matter of the present application will be explained. For illustrative purposes, certain configurations and details will be described in sufficient detail to provide a complete understanding of the subject matter of the present application. However, it will be apparent to those skilled in the art that the subject matter of the present application can be carried out without the specific configurations and details presented herein.

[0057] First, please draw attention to Figures 1 and 2, which show cutting tools 20 and 120 of a type used in turning operations according to embodiments of the subject matter of this application. In this non-limiting example shown, the cutting tools 20 and 120 are groove cutting tools for cutting an internal diameter groove. The cutting tools 20 and 120 are directed in the opposite forward direction D F and rearward direction D R It has a tool center axis A that defines the area.

[0058] Please understand that throughout the specification and claims, the terms "front" and "back" refer to relative positions in the direction of the tool's central axis A, which points to the right and left, respectively, in Figure 8.

[0059] The cutting tools 20, 120 include two parts, namely cutting heads 22, 122 and complementary tool shanks 24, 124 that are releasably mounted to the cutting heads 22, 122. Both parts can typically be made from the same material, e.g., steel. Therefore, both parts can have the same hardness. The cutting inserts 26 are releasably mounted to the cutting heads 22, 122 within insert pockets 27. Thus, the cutting tools 20, 120 are modular. In this non-limiting example, the cutting tools 20, 120 include a single cutting insert 26. However, the cutting tools 20, 120 can have multiple cutting inserts. Each cutting insert 26 can typically be made from cemented carbide and is mounted within an insert pocket 27, which may be located at the front end of the cutting heads 22, 122. The cutting tools 20, 120 are adjustable between a released position and a locked position. In the locked position of the cutting tools 20 and 120, the cutting heads 22 and 122 are releasably attached to the tool shanks 24 and 124 by fastening members 28.

[0060] Referring particularly to Figure 3, the insert pocket 27 includes a pocket seating surface 27a configured to accommodate a cutting insert 26. In the non-limiting examples shown in Figures 1 to 4, the insert pocket 27 is in the form of a small hole with an elastic upper arm that clamps the cutting insert. However, as shown in Figure 17 illustrating a turning tool, the insert pocket 27 can be a typical turning pocket that clamps the cutting insert 26 by fastening screws (not shown).

[0061] Referring to Figures 3 to 8, the cutting heads 22 and 122 include opposite first head end faces 34a and second head end faces 34b, and a head outer peripheral surface 36 extending between the first head end face 34a and the second head end face 34b. The first head end face 34a is in the rearward direction D F The head faces in the opposite direction and is therefore backward-facing. The outer circumferential surface 36 of the head extends circumferentially around the tool axis A and forms the boundary between the first head end face 34a and the second head end face 34b. The tool axis A intersects with the first head end face 34a and the second head end face 34b. The cutting heads 22, 122 have their own head axis B which coincides with (i.e., is aligned with) the tool axis A when the cutting tools 20, 120 are in the locked position.

[0062] According to some embodiments of the subject matter of this application, the cutting heads 22, 122 can be additively manufactured. The cutting heads 22, 122 can be integrally formed to have a single, integrated structure. It should be noted that the use of the term “additive manufacturing” throughout the specification and claims refers to a process used to produce a three-dimensional object in which multiple layers of material are formed to produce a single object. Examples of such processes include, but are not limited to, selective laser melting (SLM), selective laser sintering (SLS), direct metal laser sintering (DMLS), fused deposition modeling (FDM), and 3D printing.

[0063] Referring to Figures 9 to 13, the tool shanks 24 and 124 include opposite first shank end faces 76a and second shank end faces 76b, and a shank outer peripheral surface 78 extending between the first shank end face 76a and the second shank end face 76b. The first shank end face 76a faces forward in the D direction. F The shank outer surface 78 extends circumferentially around the tool axis A and forms the boundary between the first shank end face 76a and the second shank end face 76b. The tool axis A intersects with the first shank end face 76a and the second shank end face 76b. The tool shanks 24, 124 have their own shank axis C which coincides with (i.e., is aligned with) the tool axis A when the cutting tools 20, 120 are in the locked position.

[0064] As best shown in Figure 1, the cutting tools 20, 120 include a coupling pin 38 extending along the pin central axis D. The coupling pin 38 protrudes from either the first head end face 34a or the first shank end face 76a. According to a first embodiment of the subject matter of this application (i.e., Figure 2), the coupling pin 38 may protrude from the first head end face 34a. Alternatively, according to a second embodiment of the subject matter of this application (i.e., Figure 17), the coupling pin 38 may protrude from the first shank end face 76a. The coupling pin 38 has a pin fixed end 40 (the coupling pin 38 is fixed from the pin fixed end 40 to either the first head end face 34a or the first shank end face 76a from which the coupling pin 38 protrudes) and a pin free end 41 axially opposite to the pin fixed end 40.

[0065] The coupling pin 38 has two purposes. The first purpose is to position the cutting heads 22, 122 precisely in place relative to the tool shanks 24, 124. The second purpose is to provide a coupling means between the cutting heads 22, 122 and the tool shanks 24, 124. The coupling pin 38 includes an outer pin surface 44 that extends around the pin central axis D.

[0066] As can be seen in Figures 3 and 4, the coupling pin 38 has a non-cylindrical cross-sectional shape along most of its length along the pin central axis D. Therefore, the outer surface 44 of the pin does not have helical threads extending in the direction along the pin central axis D, and can therefore be considered a non-threaded pin outer surface 44.

[0067] According to some embodiments of the subject matter of this application, the outer surface of the pin 44 does not need to be tapered. That is, the outer surface of the pin 44 is in the rear direction D R The pin does not need to be inclined toward (or away from) the pin central axis D. The coupling pin 38 may include a pin rear surface 42 that is separated from the first head end face 34a by the pin outer surface 44. That is, the pin outer surface 44 may extend between the pin rear surface 42 and the first head end face 34a. The pin rear surface 42 may be bounded by the pin outer surface 44. The pin central axis D may intersect the pin rear surface 42. The cutting tools 20, 120 may include a single coupling pin 38 that can be centrally located (that is, the coupling pin 38 may extend along the head central axis B). The pin central axis D may coincide with the head central axis B.

[0068] Referring to Figure 4, according to some embodiments of the subject matter of this application, the outer surface of the pin 44 includes opposing pin upper surfaces 46 and pin lower surfaces 48, and two opposing pin side surfaces 50 connecting the pin upper surfaces 46 and pin lower surfaces 48. According to some embodiments of the subject matter of this application, the pin upper surface 46 may be flat. The two pin side surfaces 50 may be curved in a convex shape.

[0069] The coupling pin 38 includes a pin vertical axis VP, which is perpendicular to the pin central axis D, intersects with the pin central axis D, and also intersects with the pin upper surface 46 and the pin lower surface 48. The pin vertical axis VP is perpendicular to the opposing upward direction D U and downward D DThe pin 38 includes a pin horizontal axis HP, which intersects the pin central axis D and also intersects the two pin sides 50. The pin central axis D, the pin vertical axis VP and the pin horizontal axis HP are mutually orthogonal to each other. The pin 38 has a pin central plane MP that includes the pin central axis D and the pin horizontal axis HP, which extends through the two pin sides 50 (i.e., intersects the two pin sides 50). The pin 38 has a pin vertical plane PVP that includes the pin central axis D and the pin vertical axis VP, which is therefore defined by the line of intersection of the pin central axis D and the pin vertical axis VP, and extends through the pin top surface 46 and the pin bottom surface 48 (i.e., intersects the pin top surface 46 and the pin bottom surface 48).

[0070] Please understand that the terms “upward” and “downward” throughout the specification and claims refer to the relative positions in the direction of the pin perpendicular VP upward and downward in Figure 4, respectively.

[0071] Referring to Figures 3 and 4, the coupling pin 38 includes a pin engagement groove 52 formed in a recess of the pin's outer circumferential surface 44. More specifically, the pin engagement groove 52 is located on the pin's lower surface 48. The pin engagement groove 52 extends from the pin's free end 41 to the pin's fixed end 40. The pin engagement groove 52 extends along the groove's longitudinal axis G. The pin engagement groove 52 is formed between two pin protrusions 53. According to some embodiments of the subject matter of this application, the groove's longitudinal axis G may be parallel to the pin's central axis D. In some embodiments, the pin perpendicular plane PVP may include both the groove's longitudinal axis G and the pin's central axis D.

[0072] The pin engagement groove 52 may extend linearly along the longitudinal axis G of the groove. The pin engagement groove 52 may have a U-shaped cross-section in a plane perpendicular to the longitudinal axis G of the groove and / or the pin center axis D. The pin engagement groove 52 may extend to the rear surface 42 of the pin (i.e., intersect with the rear surface 42 of the pin).

[0073] Referring to Figure 4A, the two pin protrusions 53 may have different heights (i.e., downward D D(and may extend to different positions). Alternatively, in some embodiments, the two pin protrusions 53 may have different shapes and / or circumferential lengths. The pin engagement groove 52, and therefore the coupling pin 38 itself, may exhibit mirror asymmetry with respect to the pin perpendicular plane PVP. The longitudinal axis G of the groove may be offset from the pin perpendicular plane PVP (i.e., not contained within the pin perpendicular plane PVP) and parallel to the pin perpendicular plane PVP.

[0074] Referring to Figure 4A, according to some embodiments of the subject matter of the present application, the pin engagement groove 52 may include two opposing groove sides 54, which are inclined inward (i.e., toward the pin central axis D) toward the opposite width direction of the pin engagement groove 52 such that the groove sides 54 converge toward each other. The two groove sides 54 may intersect each other. The longitudinal axis G of the groove may be defined by the line of intersection of the two groove sides 54.

[0075] According to some embodiments of the subject matter of the present application, the pin engagement groove 52 may include a groove-concave curved portion 56. The groove-concave curved portion 56 may connect two groove sides 54. The groove-concave curved portion 56 may extend along the groove longitudinal axis G. The groove-concave curved portion 56 includes the lowest point on the pin engagement groove 52.

[0076] According to some embodiments of the subject matter of this application, the coupling pin 38 may have a basic bean-shaped outline in the front view of the cutting heads 22, 122 (i.e., Figure 4). Note that the coupling pin 38 may exhibit rotational symmetry about the pin axis D only 360°. Therefore, the coupling pin 38 is considered to be "rotationally asymmetric" about the pin axis D.

[0077] Referring again to Figure 4A, the grooved concave curved portion 56 can be defined by the grooved concave radius GR. The grooved concave radius GR can satisfy the condition: 2.8 mm ≤ GR ≤ 3.6 mm. Preferably, the grooved concave radius GR can be equal to 3.2 mm.

[0078] The grooved concave curved portion 56 has a concave portion width GCW. The concave portion width GCW is measured along the groove horizontal axis HG. According to some embodiments of the subject matter of this application, the concave portion width GCW may satisfy the condition: 2.84 mm ≤ GCW ≤ 3.24 mm. Preferably, the concave portion width GCW may be equal to 3.04 mm. The concave portion width GCW may be constant along the groove longitudinal axis G.

[0079] The pin engagement groove 52 has a groove depth GD. The groove depth GD is measured along the pin vertical axis VP (between the point closest to and furthest from the pin central plane MP of the pin engagement groove). According to some embodiments of the subject matter of this application, the groove depth GD may satisfy the condition: 0.3 mm ≤ GD ≤ 0.7 mm. Preferably, the groove depth GD may satisfy the condition: 0.4 mm ≤ GD ≤ 0.6 mm. More preferably, the groove depth GD may be equal to 0.5 mm. The groove depth GD may be constant along the groove longitudinal axis G.

[0080] The pin engagement groove 52 has a groove width GW. The groove width GW is measured along the pin horizontal axis HP (between the furthest points on each side of the pin vertical plane PVP of the pin engagement groove). According to some embodiments of the subject matter of this application, the groove width GW may satisfy the condition: 5.0 mm ≤ GW ≤ 5.84 mm. Preferably, the groove width GW may be equal to 5.42 mm. The groove width GW may be constant along the groove longitudinal axis G. The groove width GW may exceed the concave portion width GCW.

[0081] Referring to Figure 7, the pin engagement groove 52 has a groove length GL. The groove length GL is measured along the pin central axis D. According to some embodiments of the subject matter of the present application, the pin engagement groove 52 may extend longitudinally along the entire axial range of the coupling pin 38.

[0082] As shown in Figure 6, the outer circumferential surface 44 of the pin includes a clamping recess 58. In other words, the clamping recess 58 is located on the outer circumference of the coupling pin 38. More specifically, the clamping recess 58 is located on the top surface 46 of the pin. The clamping recess 58 is designed to receive a portion of the fastening member 28. As seen in Figures 3 and 4, the clamping recess 58 is located opposite the pin engagement groove 52 around the pin central axis D. Thus, according to some embodiments of the subject matter of this application, the pin vertical plane PVP may intersect the clamping recess 58 and the pin engagement groove 52. The top surface 46 of the pin (the clamping recess 58 is located above the top surface 46 of the pin) may face the same direction as the pocket seat surface 27a.

[0083] Referring to Figure 8, according to some embodiments of the subject matter of the present application, the coupling pin 38 may include exactly one clamping recess 58. The clamping recess 58 may be spaced apart from the rear surface 42 of the pin. Similarly, the clamping recess 58 may be spaced apart from the first head end face 34a. The clamping recess 58 may include a clamping recess contact surface 60 that contacts the fastening member 28. The clamping recess contact surface 60 may be flat. The clamping recess contact surface 60 may be inclined toward the pin central plane MP in the direction toward the first head end face 34a.

[0084] The contact surface 60 of the clamping recess can form a recess inclination angle θ with the upper surface 46 of the pin. The recess inclination angle θ can be 6° or more and 10° or less. Preferably, the recess inclination angle θ can be equal to 8°. Therefore, the clamping recess 58 may be shallow and will not excessively reduce the overall strength of the connecting pin 38.

[0085] As can be seen in Figures 6 and 7, the cutting heads 22, 122 include a head axial contact surface 66 located on the first head end face 34a. The head axial contact surface 66 is intended to contact the corresponding surface on the tool shank 24, 124. According to some embodiments of the subject matter of the present application, the head axial contact surface 66 may extend radially outward with respect to the head circumferential surface 36. The head axial contact surface 66 may be flat and extend perpendicular to the head central axis B.

[0086] According to some embodiments of the subject matter of this application, the cutting heads 22, 122 may include a head tightening through-hole 62, which is formed in a recess of the second head end face 34b and opens to the first head end face 34a. The head tightening through-hole 62 is designed to receive a tightening screw that is tightened complementarily, as will be described later in this specification. As best shown in FIG. 4, the pin engaging groove 52 allows the diameter of the head tightening through-hole 62 to be larger than the diameter allowed when there is no groove and the coupling pin extends further downward (i.e., in a direction away from the pin central plane MP).

[0087] Referring to FIG. 8, according to some embodiments of the subject matter of this application, the cutting heads 22, 122 may include a head coolant passage 70. The head coolant passage 70 has a head coolant passage inlet 72i and a head coolant passage outlet 72o. The head coolant passage outlet 72o is in fluid communication with the head coolant passage inlet 72i through the head coolant passage 70. The head coolant passage outlet 72o is positioned to direct the coolant towards the cutting area. The head coolant passage inlet 72i may be located on the pin rear face 42. In this non-limiting example shown in the figure, the cutting heads 22, 122 include two head coolant passages 70.

[0088] As best shown in FIGS. 9 to 13, the cutting tools 20, 120 include a pin receiver 80 that extends along the receiving central axis E. The pin receiver 80 is formed in a recess of the other of the first head end face 34a and the first shank end face 76a (i.e., in a recess of the first head end face 34a or the first shank end face 76a where the coupling pin 38 does not protrude). According to the first embodiment of the subject matter of this application, the pin receiver 80 may be placed in a recess of the first shank end face 76a. As can be seen in the figure, in the first embodiment, the pin receiver 80 projects forward from the shank axial contact surface 104 located on the first shank end face 76a in the forward direction D F and can be placed in a recess of the shank protrusion 39. Alternatively, according to the second embodiment of the subject matter of this application, the pin receiver 80 may be placed in a recess of the first head end face 34a.

[0089] Referring to Figure 13, the pin receiver 80 includes a receiver open end 82 (opening to either the first head end face 34a or the first shank end face 76a, in which the pin receiver 80 is formed in a recess) and a receiver bottom end 84 opposite the receiver open end 82 in the axial direction. The pin receiver 80 includes a receiver inner circumferential surface 86 extending around the receiver central axis E. In the illustrated embodiment, the inner circumferential surface 86 does not have helical threads extending in the direction along the receiver central axis E and can therefore be considered a non-screwed inner circumferential surface 86. According to some embodiments of the subject matter of the present application, the pin receiver 80 may include a receiver rear surface 88 that is tangent to the receiver inner circumferential surface 86. The receiver central axis E may intersect the receiver rear surface 88. Cutting tools 20, 120 may include a single pin receiver 80 that may be centrally located (i.e., the pin receiver 80 may extend along the shank central axis C). The receiving axis E may coincide with the shank axis C.

[0090] Referring to Figure 12, the inner circumferential surface 86 of the receiving surface includes opposing receiving upper surface 116 and receiving lower surface 118, and two opposing receiving side surfaces 119 connecting the receiving upper surface 116 and receiving lower surface 118. According to some embodiments of the subject matter of the present application, the receiving upper surface 116 may be flat. The two receiving side surfaces 119 may be concavely curved.

[0091] The pin receiver 80 includes a receiver vertical axis VR, which is perpendicular to the receiver central axis E, intersects with the receiver central axis E, and also intersects with the receiver upper surface 116 and the receiver lower surface 118. The pin receiver 80 includes a receiver horizontal axis HP, which intersects with the receiver central axis E and also intersects with the two receiver sides 119. The receiver central axis E, the receiver vertical axis VR, and the receiver horizontal axis HR are mutually orthogonal to each other. The pin receiver 80 has a receiver central plane MR, which includes the receiver central axis E and the receiver horizontal axis HR, and extends through the two receiver sides 119 (i.e., intersects with the two receiver sides 119). The pin receiver 80 has a receiver vertical plane RVP, which includes the receiver central axis E and the receiver vertical axis VR, and is therefore defined by the line of intersection of the receiver central axis E and the receiver vertical axis VR. The receiving vertical plane RVP extends through the receiving upper surface 116 and the receiving lower surface 118 (i.e., intersects with the receiving upper surface 116 and the receiving lower surface 118).

[0092] The pin receiver 80 may include a receiver engagement ridge 90 protruding from the inner circumferential surface 86 of the receiver. In detail, the receiver engagement ridge 90 is located on the lower surface 118 of the receiver. The receiver engagement ridge 90 extends along the longitudinal axis R of the ridge from the open end 82 of the receiver toward the bottom end 84 of the receiver. The receiver engagement ridge 90 is formed between two receiver grooves 91. According to some embodiments of the subject matter of the present application, the longitudinal axis R of the ridge may be parallel to the receiver central axis E. In some embodiments, the receiver vertical plane RVP may include both the longitudinal axis R of the ridge and the receiver central axis E, as well as the receiver vertical axis VR.

[0093] The receiving engagement protrusion 90 may extend linearly along the longitudinal axis R of the protrusion. The receiving engagement protrusion 90 may have a U-shaped cross-section in a plane perpendicular to the longitudinal axis R of the protrusion and / or the receiving center axis E. The receiving engagement protrusion 90 may extend to the first shank end face 76a (and may intersect with the first shank end face 76a).

[0094] Referring to Figure 12A, the two receiving grooves 91 may have different depths (i.e., downward D D (and may extend to different positions). Alternatively, in some embodiments, the two receiving grooves 91 may have different shapes and / or circumferential lengths. The receiving engagement ridge 90, and therefore the pin receiving 80 itself, may exhibit mirror asymmetry with respect to the receiving vertical plane RVP. The lateral axis R of the ridge length may be offset from the receiving vertical plane RVP (i.e., not contained within the receiving vertical plane RVP) and parallel to the receiving vertical plane RVP.

[0095] Referring to Figure 12, according to some embodiments of the subject matter of the present application, the receiving engagement ridge 90 may include two opposing ridge side surfaces 92, the ridge side surfaces 92 inclined inward (i.e., toward the receiving central axis E) in the opposite width direction of the receiving engagement ridge 90 such that the ridge side surfaces 92 converge toward each other. The two ridge side surfaces 92 may intersect each other. The lateral axis R of the ridge may be defined by the intersection line of the two ridge side surfaces 92.

[0096] According to some embodiments of the subject matter of the present application, the receiving engagement protrusion 90 may include a convex curved portion 94 of the protrusion. The convex curved portion 94 may connect two protrusion sides 92. The concave curved portion 94 may extend along the longitudinal axis R of the protrusion. The convex curved portion 94 includes the highest point on the receiving engagement protrusion 90.

[0097] According to some embodiments of the subject matter of this application, the pin receiver 80 may have a basic shape that matches the shape of the coupling pin 38 (the coupling pin 38 is at least slightly smaller to allow free insertion into the pin receiver 80). That is, the pin receiver 80 may have a bean-shaped outline in the front view of the tool shanks 24, 124 (i.e., Figure 12), and thus the pin receiver 80 may exhibit rotational symmetry about the receiver axis E only 360°. Thus, the pin receiver 80 is considered to be "rotationally asymmetric" about the pin axis D.

[0098] Referring to Figure 12A, the raised convex curved portion 94 can be defined by the raised convex radius RR. The raised convex radius RR can satisfy the condition: 2.8 mm ≤ RR ≤ 3.6 mm. Preferably, the raised convex radius RR can be equal to 3.2 mm. The raised convex radius RR can have the same value as the groove convex radius GR.

[0099] The raised convex curved portion 94 has a convex portion width RCW. The convex portion width RCW is measured along the horizontal axis HR of the raised portion. According to some embodiments of the subject matter of this application, the convex portion width RCW may satisfy the condition: 2.84 mm ≤ RCW ≤ 3.24 mm. Preferably, the convex portion width RCW may be equal to 3.04 mm. The convex portion width CW may be constant along the lateral axis R of the raised portion.

[0100] The receiving engagement ridge 90 has a ridge height RH. The ridge height RH is measured along the pin vertical axis VP (between the point closest to and furthest from the receiving central plane MR of the receiving engagement ridge). According to some embodiments of the subject matter of this application, the ridge height RH may satisfy the condition: 0.3 mm ≤ RH ≤ 0.7 mm. Preferably, the ridge height RH may satisfy the condition: 0.4 mm ≤ RH ≤ 0.6 mm. More preferably, the ridge height RH may be equal to 0.5 mm. The ridge height RR may be constant along the lateral axis R of the ridge length.

[0101] The receiving engagement ridge 90 has a ridge width RW. The ridge width RW is measured along the horizontal axis HR of the ridge (between the furthest points on each side of the receiving vertical plane RVP of the receiving engagement ridge). According to some embodiments of the subject matter of this application, the ridge width RW may satisfy the condition: 5.0 mm ≤ RW ≤ 5.84 mm. Preferably, the ridge width RW may be equal to 5.42 mm. The ridge width RW may be constant along the lateral axis R of the ridge length. The ridge width RW may exceed the convex portion width RCW.

[0102] Referring to Figure 9, the receiving engagement ridge 90 has a ridge length RL. The ridge length RL is measured along the receiving central axis E. According to some embodiments of the subject matter of the present application, the receiving engagement ridge 90 may extend longitudinally along the entire axial range of the pin receiver 80.

[0103] Referring to Figures 9 to 11, the cutting tools 20, 120 include a clamping through-hole 96, which is formed in either the head outer circumferential surface 36 or the shank outer circumferential surface 78, in which a pin receiver 80 is formed in a recess. The clamping through-hole 96 is designed to receive a fastening member 28, as will be described later in this specification. According to the first embodiment, the clamping through-hole 96 is formed in the shank outer circumferential surface 78, and according to the second embodiment, the clamping through-hole 96 is formed in the head outer circumferential surface 36.

[0104] The clamping through-hole 96 opens into the pin receiver 80 at the receiving through-hole opening 98 (i.e., the clamping through-hole 96 is formed on the same component as the pin receiver 80). More specifically, the receiving through-hole opening 98 is located on the receiver upper surface 116. The receiving through-hole opening 98 is located on the opposite side of the receiver engagement protrusion 90 around the receiver central axis E. Thus, according to some embodiments of the subject matter of this application, the receiver vertical plane RVP may intersect the receiving through-hole 98 and the receiver engagement protrusion 90.

[0105] According to some embodiments of the subject matter of the present application, the cutting tools 20, 120 may include exactly one clamping through-hole 96. The clamping through-hole 96 may include a female threaded portion 100. As seen in Figure 13, the clamping through-hole 96 may be inclined away from the first shank end face 76a in the direction from the shank outer circumferential surface 78 to the receiving through-hole opening 98. The clamping through-hole 96 may be inclined with respect to the receiving vertical axis VR at a hole inclination angle α. The hole inclination angle α may be 6° or more and 10° or less. Preferably, the hole inclination angle α may be equal to 8°.

[0106] As shown in Figures 1 and 13, the tool shanks 24, 124 include the aforementioned shank axial contact surface 104 located on the first shank end face 76a. According to some embodiments of the subject matter of the present application, the shank axial contact surface 104 may extend radially outward with respect to the shank outer circumferential surface 78. The shank axial contact surface 104 may be flat and extend perpendicular to the shank central axis C.

[0107] According to some embodiments of the subject matter of this application, the tool shanks 24, 124 may include a shank clamping through-hole 102, which is formed in a recess of the first shank end face 76a. The shank clamping through-hole 102 may be located below a receiving engagement ridge 90 and / or intersect with the receiving vertical plane RVP and / or the receiving vertical axis VR. The shank clamping through-hole 102 is designed for screwing in a clamping screw, as will be described later herein.

[0108] Referring to Figure 13, according to some embodiments of the subject matter of the present application, the tool shanks 24, 124 may include a shank coolant passage 106. The shank coolant passage 106 has a shank coolant passage inlet 107i and a shank coolant passage outlet 107o. The shank coolant passage outlet 107o is in fluid communication with the shank coolant passage inlet 107i through the shank coolant passage 106. The shank coolant passage inlet 107i is connected to a coolant supply source. The shank coolant passage outlet 107o may be located on a receiving rear surface 88.

[0109] Returning to Figure 1, according to some embodiments of the subject matter of the present application, the cutting heads 20, 120 may include strictly one fastening member 28. The fastening member 28 may be rigidly formed. The fastening member 28 may include a male threaded portion 108. The fastening member 28 includes a clamping portion 110 designed to act on a clamping recess 58. The clamping portion 110 may have a flat shape. The clamping portion 110 and the male threaded portion 108 may be located at both ends of the fastening member 28. In this non-limiting example shown, the fastening member 28 is a grub screw. Advantageously, the grub screw does not protrude from the clamping through hole 62.

[0110] The assembly of the cutting tools 20 and 120 (i.e., adjustment of the cutting tools 20 and 120 to their locking positions) is achieved by performing the following steps: Insert the coupling pin 38 into the pin receiver 80 until the head axial contact surface 66 contacts the shank axial contact surface 104. During insertion, the receiving engagement protrusion 90 slides along the pin engagement groove 52. The coupling pin 38 only needs to be inserted into the pin receiver 80 at a single rotatable position around the head central axis B. Next, pass the fastening member 28 through the tightening through hole 96 so that the tightening portion 110 enters the pin receiver 80 and contacts the tightening recess 58 with the tightening recess contact surface 60.

[0111] Referring to Figures 14 and 16, due to the orientation and position of the clamping recess contact surface 60, further insertion of the fastening member 28 generates a first clamping force F1 and a second clamping force F2 acting simultaneously on the clamping recess 58 of the coupling pin 38. As seen in Figure 14, the first clamping force F1 acts axially, causing the cutting heads 22, 122 and the tool shanks 24, 124 to displace each other, so that the head axial contact surface 66 makes firm contact with the shank axial contact surface 104. The second clamping force F2 acts downward, causing the cutting heads 22, 122 to move downward, so that the pin engagement groove 52 makes firm contact with the receiving engagement protrusion 90. In this way, the cutting tools 22, 122 are releasably attached to the tool shanks 24, 124 by the fastening member 28. Advantageously, the engagement of the grooves / ridges prevents the cutting heads 22 and 122 from being displaced laterally, particularly in the lower region of the pins / receivers, during cutting operations.

[0112] According to some embodiments of the subject matter of this application, the grooved concave curved portion 56 may abut against the raised convex curved portion 94. Each pin side surface 50 may abut against its respective receiving side surface 199. The portion of the pin lower surface 48 where the pin engagement groove 52 is not located may be spaced apart from the portion of the receiving lower surface 118 where the receiving engagement raised portion 90 is not located. In particular, the portion of the pin engagement groove 52 where the grooved concave curved portion 56 is not located may be spaced apart from the portion of the pin receiving 80 where the raised convex curved portion 90 is not located.

[0113] According to some embodiments of the subject matter of the present application, in the locked position, the male threaded portion 108 can be screwed into the female threaded portion 100.

[0114] In high-load cutting or roughing operations with high cutting force, the complementary tightening screw 114 can be used to provide complementary tightening of the cutting heads 22, 122 to the tool shanks 24, 124. In such a configuration, in the locked position, the complementary tightening screw 114 is located within the head tightening through hole 62 and screws into the shank tightening screw hole 102.

[0115] According to some embodiments of the subject matter of the present application, the head coolant passage 70 and the shank coolant passage 106 can be in fluid communication with each other at the locking position of the cutting tools 20, 120. The head coolant passage inlet 72i can be aligned with the shank coolant passage outlet 107o. As shown in Figure 16, the head coolant passage 70 and the shank coolant passage 106 can be in fluid communication with each other via a coolant tank 112 defined by a gap formed between a coupling pin 38 and a pin receiver 80.

[0116] From the above, it can be seen that in one embodiment, the coupling pin 38 is formed on the cutting head 22, and the pin receiver 80 and the tightening through hole 96 are formed on the tool shank 24, while in another embodiment, the coupling pin 38 is formed on the tool shank 124, and the pin receiver 80 and the tightening through hole 96 are formed on the cutting head 122.

[0117] Unlike cylindrical, square, or elliptical coupling pins, it should be noted that the coupling pin of the present invention can be inserted into the pin receiver in only one rotational position.

[0118] It should be further noted that in a configuration where the upper surface 46 of the pin faces the same direction as the pocket seat surface 27a, the second tightening force F2 acts in a direction substantially perpendicular to the pocket seat surface 27a.

[0119] It should also be noted that the above-mentioned rotary cutting tools 20 and 120 are easy and quick to assemble.

[0120] While the subject matter of this application has been described in some detail, it should be understood that various modifications and alterations can be made without departing from the spirit or scope of the invention as claimed below. For example, the tool shanks 24, 124 may be formed from a plurality of parts joined together via the type of coupling mechanism described above.

Claims

1. Opposite forward direction (D Ｆ ) and rearward (D Ｒ A cutting tool (20, 120) having a tool central axis (A) that defines ), wherein the cutting tool (20, 120) A cutting head (22, 122), The head outer circumferential surface (36) extends circumferentially around the tool central axis (A) and forms the boundary of the rearward-facing first head end face (34a), The head axial contact surface (66) located on the first head end face (34a), Insert pockets (27) and A cutting head (22, 122) is provided, The tool shank (24, 124) is The shank outer surface (78) extends circumferentially around the tool central axis (A) and forms the boundary of the forward-facing first shank end face (76a), The shank axial contact surface (104) located on the first shank end face (76a), It has a tool shank (24, 124) and A coupling pin (38) protruding from one of the first head end face (34a) and the first shank end face (76a), The outer surface of the pin (44) extends around the central axis (D) of the pin, A pin vertical axis (VP) that is perpendicular to the pin central axis (D) and intersects with the pin central axis (D), thereby defining the pin vertical plane (PVP), A pin engagement groove (52) is formed in a recess on the outer surface (44) of the pin and extends along the longitudinal axis (G) of the groove from the free end (41) of the pin toward the fixed end (40) of the pin, A tightening recess (58) is formed in a recess on the outer surface (44) of the pin opposite to the pin engagement groove (52) around the pin central axis (D), A coupling pin (38) is provided, A pin receiver (80) formed in the other recess of the first head end face (34a) and the first shank end face (76a), The inner circumferential surface (86) of the receiver extends around the central axis (E), A vertical receiving axis (VR) that intersects the aforementioned central receiving axis (E) perpendicularly, thereby defining the vertical receiving plane (RVP), A receiving engagement protrusion (90) protrudes from the receiving inner circumferential surface (86) and extends along the longitudinal axis (R) of the protrusion from the receiving open end (82) toward the receiving bottom end (84), A pin receiver (80) and A fastening through hole (96) and Equipped with, The clamping through hole (96) is formed in the outer circumferential surface of the head (36) or the outer circumferential surface of the shank (78) where the pin receiver (80) is formed in a recess, and opens to the pin receiver (80) at the receiving through hole opening (98) located on the opposite side of the receiving engagement protrusion (90) around the receiving central axis (E). The cutting tools (20, 120) are adjustable between a released position and a locked position, and in the locked position, The coupling pin (38) is received by the pin receiver (80). The fastening member (28) passes through the fastening through hole (96) and into the fastening recess (58) of the connecting pin (38), The pin engagement groove (52) comes into contact with the receiving engagement protrusion (90), The head axial contact surface (66) contacts the shank axial contact surface (104), The cutting heads (22, 122) and the tool shanks (24, 124) act to be releasably mounted together. Cutting tools (20, 120).

2. The coupling pin (38) protrudes from the first head end face (34a), The pin receiver (80) is formed in a recess of the first shank end face (76a), The clamping through hole (96) is formed within the outer circumferential surface (78) of the shank. The cutting tool (20) according to claim 1.

3. The pin engagement groove (52) includes a groove-concave curved portion (56) that extends along the longitudinal axis (G) of the groove, The receiving engagement protrusion (90) includes a convex curved portion (94) of the protrusion that extends along the lateral axis (R) of the protrusion, At the locking position, the groove-shaped curved portion (56) abuts against the raised portion-shaped curved portion (94). The cutting tool (20) according to claim 1 or 2.

4. The cutting tool (20, 120) comprises a coupling pin (38) disposed at a single center and a pin receiver (80) disposed at a single center. A cutting tool (20, 120) according to any one of claims 1 to 3.

5. The cutting tool (20, 120) comprises a single fastening member (28) that secures the cutting head (22, 122) to the tool shank (24, 124), and a single fastening through hole (96), The coupling pin (38) has exactly one clamping recess (58), A cutting tool (20, 120) according to any one of claims 1 to 4.

6. The aforementioned fastening through hole (96) is provided with a female thread portion (100), The fastening member (28) is equipped with a male threaded portion (108), In the aforementioned locking position, the male thread portion (108) is screwed into the female thread portion (100). A cutting tool (20, 120) according to any one of claims 1 to 5.

7. The coupling pin (38) protrudes from the first shank end face (76a), The pin receiver (80) is formed in a recess of the first head end face (34a), The clamping through hole (96) is formed within the outer circumferential surface (36) of the head. A cutting tool (120) according to any one of claims 1 to 6.

8. Opposite forward direction (D Ｆ ) and rearward (D Ｒ A cutting head (22, 122) having a head central axis (B) that defines ), wherein the cutting head (22, 122) The head outer circumferential surface (36) extends circumferentially around the head central axis (B) and forms the boundary of the rearward-facing first head end face (34a), The head axial contact surface (66) located on the first head end face (34a), Insert pockets (27) and Either a coupling pin (38) protruding from the first head end face (34a) or a pin receiver (80) formed in a recess of the first head end face (34a), A fastening through hole (96) and Equipped with, The aforementioned coupling pin (38) is The outer surface of the pin (44) extends around the central axis (D) of the pin, A pin vertical axis (VP) that is perpendicular to the pin central axis (D) and intersects with the pin central axis (D), thereby defining the pin vertical plane (PVP), A pin engagement groove (52) is formed in a recess on the outer surface (44) of the pin and extends along the longitudinal axis (G) of the groove from the free end (41) of the pin toward the fixed end (40) of the pin, A tightening recess (58) is formed in a recess on the outer surface (44) of the pin opposite to the pin engagement groove (52) around the pin central axis (D), Equipped with, The aforementioned pin receiver (80) is The inner circumferential surface (86) of the receiver extends around the central axis (E), A vertical receiving axis (VR) is perpendicular to the aforementioned receiving central axis (E) and intersects with the aforementioned receiving central axis (E), thereby defining the receiving vertical plane (RVP), A receiving engagement protrusion (90) protrudes from the receiving inner circumferential surface (86) and extends along the longitudinal axis (R) of the protrusion from the receiving open end (82) toward the receiving bottom end (84), Equipped with, The aforementioned fastening through hole (96) is a receiving through hole opening (98) located on the opposite side of the receiving engagement protrusion (90) around the receiving central axis (E), formed in a recess on the outer circumferential surface (36) of the head, and opening into the pin receiver (80). Cutting head (22, 122).

9. The coupling pin (38) protrudes from the first head end face (34a), The cutting head (22) according to claim 8.

10. The pin engagement groove (52) comprises two opposing groove sides (54), and the groove sides (54) are inclined inward in the width direction opposite to the pin engagement groove (52) such that the groove sides (54) converge toward each other. The cutting head (22, 122) according to claim 9.

11. The two groove sides (54) intersect each other. The cutting head (22, 122) according to claim 10.

12. The pin engagement groove (52) is provided with a groove-shaped curved portion (56), The groove-shaped curved portion (56) extends along the longitudinal axis (G) of the groove and connects the two groove sides (54). The cutting head (22, 122) according to claim 10.

13. The pin engagement groove (52) extends longitudinally along the entire axial range of the coupling pin (38). A cutting head (22, 122) according to any one of claims 9 to 12.

14. The longitudinal axis of the groove (G) is parallel to the pin center axis (D). A cutting head (22, 122) according to any one of claims 9 to 13.

15. The head coolant passage (70) further comprises a head coolant passage inlet (72i) and a head coolant passage outlet (72o), The coupling pin (38) has a pin rear surface (42) that is in contact with the outer surface (44) of the pin, The head coolant passage inlet (72i) is located on the rear surface (42) of the pin, A cutting head (22, 122) according to any one of claims 9 to 14.

16. The pin engagement groove (52) extends to the rear surface (42) of the pin. The cutting head (22, 122) according to claim 15.

17. The outer surface of the pin (44) comprises an opposing upper pin surface (46) and a lower pin surface (48), and two opposing pin sides (50) connecting the upper pin surface (46) and the lower pin surface (48). The tightening recess (58) is located on the upper surface (46) of the pin, The clamping recess (58) comprises a clamping recess contact surface (60), the clamping recess contact surface (60) inclined toward the pin central plane (MP), the pin central plane (MP) including the pin central axis (D) and extending through two opposing pin sides (50) toward the first head end face (34a). A cutting head (22, 122) according to any one of claims 9 to 16.

18. The insert pocket (27) is provided with a pocket seat surface (27a), The aforementioned pocket seat surface (27a) is configured to mount a cutting insert (26), The pocket seat surface (27a) faces the same direction as the pin upper surface (46). The cutting head (22, 122) according to claim 17.

19. Opposite forward direction (D Ｆ ) and rearward (D Ｒ A tool shank (24, 124) having a shank central axis (C) defining the ), wherein the tool shank (24) is The shank outer circumferential surface (78) extends circumferentially around the shank central axis (C) and forms the boundary of the forward-facing first shank end face (76a), The shank axial contact surface (104) located on the first shank end face (76a), Either a coupling pin (38) protruding from the first shank end face (76a) or a pin receiver (80) formed in a recess of the first shank end face (76a), A fastening through hole (96) and Equipped with, The aforementioned coupling pin (38) is The outer surface of the pin (44) extends around the central axis (D) of the pin, A pin vertical axis (VP) that is perpendicular to the pin central axis (D) and intersects with the pin central axis (D), thereby defining the pin vertical plane (PVP), A pin engagement groove (52) is formed in a recess on the outer surface (44) of the pin and extends along the longitudinal axis (G) of the groove from the free end (41) of the pin toward the fixed end (40) of the pin, A tightening recess (58) is formed in a recess on the outer surface (44) of the pin opposite to the pin engagement groove (52) around the pin central axis (D), Equipped with, The aforementioned pin receiver (80) is The inner circumferential surface (86) of the receiver extends around the central axis (E), A vertical receiving axis (VR) is perpendicular to the aforementioned receiving central axis (E) and intersects with the aforementioned receiving central axis (E), thereby defining the receiving vertical plane (RVP), A receiving engagement protrusion (90) protrudes from the receiving inner circumferential surface (86) and extends along the longitudinal axis (R) of the protrusion from the receiving open end (82) toward the receiving bottom end (84), Equipped with, The aforementioned clamping through hole (96) is a receiving through hole opening (98) located on the opposite side of the receiving engagement protrusion (90) around the receiving central axis (E), formed in a recess on the outer circumferential surface (78) of the shank, and opening into the pin receiver (80). Tool shank (24, 124).

20. The pin receiver (80) is formed in a recess of the first shank end face (76a), The clamping through hole (96) is formed within the outer circumferential surface (78) of the shank. The tool shank (24) according to claim 19.

21. The receiving engagement protrusion (90) comprises two opposing protrusion side surfaces (92), The raised portion sides (92) are inclined inward in the width direction opposite to the receiving engagement raised portion (90) so that the raised portion sides (92) converge toward each other. The tool shank (24, 124) according to claim 20.

22. The two aforementioned raised side surfaces (92) intersect each other. The tool shank (24, 124) according to claim 21.

23. The receiving engagement protrusion (90) includes a convex curved portion (94) of the protrusion, The raised convex curved portion (94) extends along the longitudinal axis (R) of the raised portion and connects the two raised side surfaces (92). The tool shank (24, 124) according to claim 21.

24. The receiving engagement protrusion (90) extends longitudinally along the entire axial range of the pin receiver (80). A tool shank (24, 124) according to any one of claims 20 to 23.

25. The aforementioned lateral axis (R) of the raised section is parallel to the aforementioned central axis (E). A tool shank (24, 124) according to any one of claims 20 to 24.

26. The clamping through hole (96) is inclined away from the first shank end face (76a) in the direction from the outer circumferential surface of the shank (78) to the receiving through hole opening (98). A tool shank (24, 124) according to any one of claims 20 to 25.

27. The receiving engagement protrusion (90) extends to the first shank end face (76a), A tool shank (24, 124) according to any one of claims 20 to 26.

28. The aforementioned fastening through hole (96) is provided with a female threaded portion (100). A tool shank (24, 124) according to any one of claims 20 to 27.

Images