Blade holder with blade receiving recesses with blade orientation protrusions and cutting tool

Abstract

A cutting tool includes a cutting blade resiliently clamped in a blade holder. The blade holder includes a forwardly positioned blade mounting portion including a blade-receiving recess extending along a recess axis. The blade holder includes a fastener component through-hole flared open to the blade-receiving recess. The blade-receiving recess includes a blade orientation protrusion. The fastener component through-hole has a through-hole angular extent about the recess axis. The blade orientation protrusion has a blade orientation protrusion angular extent about the recess axis. The blade orientation protrusion angular extent angularly overlaps the through-hole angular extent about the recess axis at least in part.

Description

Technical Field

[0001] The subject matter of this application relates to a type of cutting tool in which a cutting blade is releasably clamped in a blade receiving recess by a fastening member, and more particularly, to such a tool in which the blade receiving recess is configured to allow the cutting blade to be inserted into the blade receiving recess at a predetermined angular position of the cutting blade. Background Technology

[0002] The cutting tool may include a blade holder and a cutting blade releasably attached to a blade receiving recess. In some such cutting tools, the cutting blade is releasably held by a fastening member. Examples of such cutting tools are disclosed, for example, in EP 0 145 985, US 2006 / 048615, US 2016 / 236282, US 2,362,053, US 5,137,401, and US 7,112,020.

[0003] Some cutting tools have blade receiving recesses configured to allow a cutting blade to be inserted into the blade receiving recess at a predetermined angular position. Examples of such cutting tools are disclosed, for example, in GB 2 228 695. In some such cutting tools, the blade receiving recess may include blade orientation protrusions that prevent insertion of the cutting blade into the blade receiving recess unless oriented at a predetermined angular position. Examples of such cutting tools are disclosed, for example, in US 8,656,573 and US 9,254,525. Summary of the Invention

[0004] According to a first aspect of the subject matter of this application, an elongated blade holder is provided, having retainer longitudinal axes defining opposite forward and rearward directions, the blade holder comprising:

[0005] The outer peripheral surface of the retainer extends circumferentially around the longitudinal axis of the retainer, and intersects with the front end surface of the retainer at the front end of the blade retainer and forms the boundary of the front end surface of the retainer.

[0006] The retainer shank portion and the blade mounting portion located at its front end, the blade mounting portion including:

[0007] A blade receiving recess extending along its axis and opening toward the front end surface of the retainer, the blade receiving recess including a circumferentially extending outer peripheral surface about the recess axis and a blade orientation protrusion projecting from the outer peripheral surface into the blade receiving recess; and

[0008] The fastening component has a through-hole that opens onto the outer peripheral surface of the retainer and the outer peripheral surface of the recess, and includes an outer peripheral surface of the through-hole extending therebetween, wherein:

[0009] In the first notch cross-sectional view taken in the radial plane of the first notch passing through the through hole of the fastener:

[0010] The outer peripheral surface of the through hole forms a through hole profile, which includes two opposing through hole profile lines; and

[0011] The through-hole profile intersects the outer peripheral surface of the notch at two through-hole points, and these two through-hole points define the range of through-hole angles around the axis of the notch; and

[0012] In the cross-sectional view of the second notch taken through the radial plane of the second notch passing through the blade orientation protrusion:

[0013] The blade orientation protrusion has a range of blade orientation protrusion angles around the axis of the notch; wherein:

[0014] The second notch radial plane is axially rear of the first notch radial plane; and

[0015] The angular range of the blade orientation protrusion overlaps at least partially with the angular range of the notch axis and the through hole.

[0016] According to a second aspect of the subject matter of this application, a cutting tool is provided, comprising:

[0017] The blade holders of the types described above; and

[0018] A cutting blade extending along its longitudinal axis and comprising a cutting portion and an axially offset shank portion thereof, wherein:

[0019] The cutting tool can be adjusted between the following positions:

[0020] Initial position, where:

[0021] The cutting blade and the blade holder's blade receiving notch are spaced apart and aligned axially.

[0022] Fastening positions, including:

[0023] The blade shank portion is located within the blade receiving recess, and the protruding front end portion extends rearward beyond the blade orientation; and

[0024] The cutting blade is releasably clamped in the blade receiving recess by a fastening member located in the fastening member through-hole.

[0025] According to a third aspect of the subject matter of this application, an elongated blade holder is provided, having retainer longitudinal axes defining opposite forward and rearward directions, the blade holder comprising:

[0026] The outer peripheral surface of the retainer extends circumferentially around the longitudinal axis of the retainer, and intersects with the front end surface of the retainer at the front end of the blade retainer and forms the boundary of the front end surface of the retainer.

[0027] The retainer shank portion and the blade mounting portion located at its front end, the blade mounting portion including:

[0028] A blade receiving recess extending along its axis and opening toward the front end surface of the retainer, the blade receiving recess including a circumferentially extending outer peripheral surface about the recess axis and a blade orientation protrusion projecting from the outer peripheral surface into the blade receiving recess; and

[0029] The fastening component has a through-hole that opens onto the outer peripheral surface of the retainer and the outer peripheral surface of the recess, and includes an outer peripheral surface of the through-hole extending therebetween, wherein:

[0030] In the first notch cross-sectional view taken in the radial plane of the first notch passing through the through hole of the fastener:

[0031] The outer peripheral surface of the through hole forms a through hole profile, which includes two opposing through hole profile lines;

[0032] The outer peripheral surface of the notch includes a secondary peripheral portion extending between two opposing through-hole profiles; and

[0033] The blade orientation protrusion is formed on at least a portion of the secondary peripheral portion.

[0034] It is understood that the foregoing is a summary, and the features described below may be applied to the subject matter of this application in any combination; for example, any of the following features may be applied to a blade holder or cutting tool:

[0035] The fastening component through-hole has a through-hole width measured between two opposing through-hole profiles. The through-hole width is at its maximum at the radial plane of the first notch.

[0036] The blade receiving notch may have an imaginary outer cylinder centered on the notch axis and touching the portion of the blade receiving notch furthest from the notch axis. The blade receiving notch may also have an imaginary inner cylinder concentric with the imaginary outer cylinder and touching the portion of the blade receiving notch closest to the notch axis. In at least one of the first and second notch cross-sectional views, the region defined between the imaginary inner and outer cylinders may form an annular region, most of which is empty.

[0037] 70% of the annular region can be empty.

[0038] The imaginary inner cylinder can only touch the protrusion at the blade location.

[0039] The blade orientation protrusion may include two protruding side surfaces. In at least one of the first and second notch cross-sectional views, the two protruding side surfaces may converge toward each other in a direction from the outer peripheral surface of the notch toward the axis of the notch.

[0040] The range of the blade orientation protrusion angle can be defined by two protrusion points, which are the points where the two protrusion side surfaces begin to deviate from the imaginary outer cylinder when they converge toward each other.

[0041] In at least one of the first and second notched cross-sectional views, the two protruding side surfaces may be concavely curved.

[0042] The two protruding side surfaces may intersect each other at the protruding ridges extending along the axis of the notch.

[0043] The protruding ridge can be parallel to the axis of the notch.

[0044] The blade orientation protrusion angle range includes the protrusion range angle at the axis of the notch. The protrusion range angle can be greater than or equal to 70° and less than or equal to 110°.

[0045] The blade orientation protrusion is mirror-symmetric about an axially bisecting plane, which includes the notch axis and bisects the protrusion's range.

[0046] The blade orientation protrusion can be axially spaced from the front end surface of the retainer.

[0047] The fastening component through hole can protrude from the blade position and open towards the outer peripheral surface of the recess.

[0048] The blade orientation protrusion may include a front portion and a rear portion, as well as a middle portion extending between them, with the front portion positioned closer to the front surface of the retainer than the rear portion. A fastening member through-hole may open toward the outer peripheral surface of the recess adjacent to the front portion of the protrusion.

[0049] The blade orientation protrusion can be integrated with the blade holder to have an integral monolithic structure with respect to the blade holder.

[0050] The blade retainer may include exactly one fastening member through hole that opens toward the outer peripheral surface of the retainer and the outer peripheral surface of the notch.

[0051] The blade receiving notch may include a plurality of notch-adjacent protrusions that protrude from the outer peripheral surface of the notch opposite to the fastening member through hole. The plurality of notch-adjacent protrusions are angularly spaced from each other and angularly spaced from the blade orientation protrusions about the axis of the notch. Each notch-adjacent protrusion includes a notch-adjacent surface.

[0052] Multiple notches adjacent to protrusions can extend in the forward direction toward the front end surface of the retainer.

[0053] The adjacent surfaces of each notch can be planar.

[0054] The adjacent surface of the notch can extend along the axis of the notch in the forward to backward direction.

[0055] Multiple notch-adjacent protrusions may include exactly two notch-adjacent protrusions.

[0056] In the end view of the blade holder, exactly two notched abutment surfaces form an abutment clamping angle between them, which is greater than 45° and less than 135°.

[0057] The outer peripheral surface of a through hole may include an internal thread portion.

[0058] The retainer handle portion may include at least one handle peripheral connection arrangement, each handle peripheral connection arrangement including two pairs of diametrically opposed planar handle peripheral abutment surfaces located on the retainer peripheral surface, the components of each pair being parallel to each other and parallel to the longitudinal axis of the retainer.

[0059] At least one shank peripheral connection arrangement includes exactly two shank peripheral connection arrangements oriented at 90° to each other about the longitudinal axis of the retainer.

[0060] The fastening component may include an externally threaded portion. In the fastened position of the cutting tool, the externally threaded portion may engage with the internally threaded portion.

[0061] The cutting blade may include two blade end surfaces and a blade outer peripheral surface extending between them about a longitudinal axis of the blade. The blade outer peripheral surface at the blade shank portion may include a planar blade shank flat surface extending to the blade end surfaces, which are positioned opposite the blade cutting portion to form an insertion cut. The blade outer peripheral surface at the blade shank portion may include a blade shank cylindrical surface located on an imaginary shank cylinder and connecting the opposite circumferential ends of the blade shank flat surface.

[0062] The flat surface of the blade shank can be parallel to the longitudinal axis of the blade.

[0063] The blade orientation protrusion can be axially spaced from the front end surface of the retainer. The cutting tool can also be adjusted to a partial insertion position between the initial position and the fastened position, and in the partial insertion position, the blade shank portion can be partially inserted rearward into the blade receiving recess until the protruding front end portion of the blade orientation protrusion.

[0064] The cutting tool can also be adjusted to an insertion position between the initial position and the tightened position, and in the insertion position, the insertion notch can be angled with the blade orientation protrusion around the notch axis. The blade shank portion can be located in the blade receiving notch, extending rearward beyond the front end of the protrusion of the blade orientation protrusion.

[0065] Each notch abuts a corresponding portion of the cylindrical surface of the blade shank. The fastening component abuts a portion of the flat surface of the blade shank.

[0066] In the fastened position of the cutting tool, the cutting tool may include at least one coolant channel formed by the gap between the outer peripheral surface of the blade and the outer peripheral surface of the notch. The at least one coolant channel may include a coolant channel inlet opening and a coolant channel outlet opening that are in fluid communication with each other.

[0067] The coolant passage outlet opening can be located on the front end surface of the retainer.

[0068] The cutting tool can be a non-rotating drill rod.

[0069] The blade orientation protrusion can be formed on the entire secondary peripheral portion.

[0070] The fastening component through-hole may have a through-hole width measured between two opposing through-hole profiles. The through-hole width may be maximum at the radial plane of the first notch. Attached Figure Description

[0071] To better understand this application and to illustrate how the invention can be practiced, reference will now be made to the accompanying drawings, in which:

[0072] Figure 1 Perspective view of the cutting tool;

[0073] Figure 2 For the initial position Figure 1 An exploded view of the cutting tool shown in the image;

[0074] Figure 3 for Figure 2 The front view of the blade holder is shown in the image;

[0075] Figure 4 for Figure 2 The rear view of the blade holder is shown in the image;

[0076] Figure 5 For along Figure 3 A cross-sectional view of the blade holder taken by line VV in the image;

[0077] Figure 6a For along Figure 5 A cross-sectional view of the first notch of the blade holder, taken by line VIa-VIa in the middle;

[0078] Figure 6b For along Figure 5 The second notch cross-sectional view of the blade holder is taken by line VIb-VIb, with the through hole outline superimposed on the second notch cross-sectional view.

[0079] Figure 7 For partial insertion positions Figure 1 The front view of the cutting tool shown in the image;

[0080] Figure 7a This is a cross-sectional view of the cutting tool, which is along... Figure 7 The line VIIa-VIIa is cut off, and it shows that the cutting blade is blocked in the rearward direction by the blade orientation protrusion;

[0081] Figure 7b For along Figure 7 A cross-sectional view of the cutting tool taken by line VIIb-VIIb in the diagram;

[0082] Figure 7c For along Figure 7b A cross-sectional view of the cutting tool taken by line VIIc-VIIc in the diagram;

[0083] Figure 8a A longitudinal cross-sectional view of the cutting tool at the insertion position;

[0084] Figure 8b For along Figure 8a The radial section view of the cutting tool intercepted by line IIXb-IIXb in the middle;

[0085] Figure 8c Another radial section view of the cutting tool, taken along line IIXb-IIXb after the cutting blade has rotated, shows the cutting blade being blocked in the direction of rotation by the blade orientation protrusion;

[0086] Figure 9 For the fastening position Figure 1 The front view of the cutting tool shown in the image;

[0087] Figure 10a For along Figure 9 A cross-sectional view of the cutting tool taken by line Xa-Xa in the diagram;

[0088] Figure 10b For along Figure 9 A cross-sectional view of the cutting tool taken by line Xb-Xb in the diagram;

[0089] Figure 11 This is a cross-sectional view of the cutting tool, which is along... Figure 10aThe line XI-XI is cut off and shows the entire radial section of the blade holder, blade, and fastening components, with the through-hole outline superimposed on this cross-sectional view;

[0090] Figure 12 for Figure 2 A perspective view of the cutting blade shown in the image;

[0091] Figure 13 for Figure 12 The rear view of the cutting blade shown in the image; and

[0092] Figure 14 for Figure 12 The image shows a side view of the cutting blade.

[0093] It will be recognized that, for the sake of simplicity and clarity, the elements shown in the figures are not necessarily drawn to scale. For example, for clarity, the dimensions of some elements may be enlarged relative to other elements, or several physical components may be included in a single functional block or element. Where deemed appropriate, reference numerals may be repeated in the figures to indicate corresponding or similar elements. Detailed Implementation

[0094] In the following description, various aspects of the subject matter of this application will be described. For purposes of explanation, specific constructions and details are set forth in sufficient detail to provide a thorough understanding of the subject matter of this application. However, it will also be apparent to those skilled in the art that the subject matter of this application can be practiced without the specific constructions and details set forth herein.

[0095] First, pay attention Figure 1 The figure illustrates a cutting tool 20 for chip removal according to an embodiment of the subject matter of this application. The cutting tool 20 has a cutting blade 22, which is typically made of cemented carbide. The cutting tool 20 also has a blade holder 24, which is typically made of steel. In this non-limiting example shown in the figures, the cutting tool 20 is a drill rod, and the cutting blade 22 is an elongated internal turning insert. The cutting tool 20 is non-rotating. That is, when a cutting operation is performed, the cutting tool 20 remains stationary while the workpiece rotates. The cutting tool 20 is adjustable between a released position and a locked position. In the locked position of the cutting tool 20, the cutting blade 22 is releasably attached to the blade holder 24 via a fastening member 25.

[0096] Now pay attention Figure 3-6b These show a blade retainer 24 according to this application. The blade retainer 24 extends along a retainer longitudinal axis B, which defines an opposite forward direction D. F and backward direction D RThe blade retainer 24 includes a retainer outer peripheral surface 26 extending circumferentially about a retainer longitudinal axis B. The retainer outer peripheral surface 26 intersects with a retainer front end surface 28 at the front end of the blade retainer 24 and forms the boundary of the retainer front end surface 28. According to some embodiments of the subject matter of this application, the blade retainer 24 may include a retainer rear end surface 29. The retainer outer peripheral surface 26 may extend between the retainer front end surface 28 and the retainer rear end surface 29. The retainer longitudinal axis B may intersect with the retainer front end surface 28 and the retainer rear end surface 29. It should be understood that the terms "front" and "rear" throughout the specification and claims refer to... Figure 5 The relative positions of the retainers on the longitudinal axis B, which faces left and right respectively.

[0097] Further reference Figure 2 The blade holder 24 includes a holder shank portion 30 and a blade mounting portion 32 located at its front end. Both the holder shank portion 30 and the blade mounting portion 32 are defined circumferentially by an outer peripheral surface 26 of the holder. According to some embodiments of the subject matter of this application, the holder shank portion 30 and the blade mounting portion 32 may be integrally formed together to have an integral, single-piece structure.

[0098] Special reference Figure 3 and Figure 4 The retainer outer peripheral surface 26 at the blade mounting portion 32 may be convexly curved. Generally, in this non-limiting example shown in the figures, the retainer outer peripheral surface 26 may have a cylindrical blade mounting portion cross-section, which is cut in a plane perpendicular to the retainer longitudinal axis B passing through the blade mounting portion 32. The retainer outer peripheral surface 26 at the retainer shank portion 30 may also be convexly curved. Furthermore, like the blade mounting portion 32, the retainer outer peripheral surface 26 at the retainer shank portion 30 may have a cylindrical shank portion cross-section, which is cut in a plane perpendicular to the retainer longitudinal axis B passing through the retainer shank portion 30. Although the fastening member through-hole and shank outer peripheral connection arrangement are described later in the specification, the retainer outer peripheral surface 26 as seen in the blade mounting portion cross-section and the retainer shank portion cross-section may be the same.

[0099] Reference Figure 4According to some embodiments of the subject matter of this application, the retainer shank portion 30 may include at least one shank peripheral engagement arrangement 34. Each shank peripheral engagement arrangement 34 is used to provide a robust and rigid connection with a tool retainer (not shown). Each shank peripheral engagement arrangement 34 may include two pairs of diametrically opposed planar shank peripheral abutment surfaces 36 located on the retainer peripheral surface 26. Components of each pair of shank peripheral abutment surfaces 36 may be parallel to each other and parallel to the longitudinal axis B of the retainer. At least one shank peripheral engagement arrangement 34 may include exactly two shank peripheral engagement arrangements 34a, 34b oriented (i.e., angularly offset, i.e., rotated 90 degrees) about the longitudinal axis B of the retainer and relative to each other. Advantageously, this allows the blade retainer 24 to be mounted to the tool retainer in two different orientations.

[0100] Reference Figure 3 and Figure 5-6b The blade mounting portion 32 includes a blade receiving recess 38. The blade receiving recess 38 is designed to receive a cutting blade 22. The blade receiving recess 38 extends along a recess axis L. The blade receiving recess 38 opens toward the front end surface 28 of the retainer. The blade receiving recess 38 includes a recess outer peripheral surface 40 that extends circumferentially about the recess axis L. The recess outer peripheral surface 40 faces radially inward. The blade receiving recess 38 includes a generally forward-facing recess stop surface 41 for positioning the cutting blade 22 in a defined axial position. The blade receiving recess 38 has a recess length R, as measured in a direction parallel to the recess axis L, between the front end surface 28 of the retainer and the recess stop surface 41. According to some embodiments of the subject matter of this application, the blade receiving recess 38 and the recess outer peripheral surface 40 may be rotationally asymmetric about the recess axis L. The recess axis L may coincide with the longitudinal axis B of the retainer.

[0101] Reference Figure 3 The blade receiving recess 38 includes a blade orientation protrusion 42 that projects radially inward from the outer peripheral surface 40 into the blade receiving recess 38. Generally, the blade orientation protrusion 42 projects toward the recess axis L. The blade orientation protrusion 42 is used only at a predetermined angular position (i.e., orientation) of the cutting blade 22 relative to the blade holder 24 to allow the cutting blade 22 to move in the rearward direction D. RThe cutting blade 22 is inserted into the blade receiving recess 38 beyond the front end of the blade orientation protrusion 42 (so that the cutting blade 22 can be releasably held in the blade receiving recess 38, wherein the cutting edge of the cutting blade is angled and positioned in the correct position for cutting operation), as described later in the specification. In other words, the blade holder 24 is designed to prevent errors (i.e., when the cutting tool 20 is in the fastening portion, the cutting blade 22 cannot be held in the blade receiving recess 38 such that its cutting edge is in the incorrect position for cutting operation). Note that the predetermined angular position can be defined by an angular range (about the longitudinal axis A of the blade) that allows the cutting blade 22 to be inserted into the blade receiving recess 38. Once the cutting blade 22 is in the rearward direction D R The cutting blade 22 is inserted beyond the front end of the blade orientation protrusion 42 (i.e., when the cutting tool 20 is in the inserted position), and the blade orientation protrusion 42 also serves to prevent rotation of the cutting blade 22. This ensures that the cutting blade 22 remains in a predetermined angular position when the fastening member 25 is actuated to clamp the cutting blade 22.

[0102] According to some embodiments of the subject matter of this application, the blade orientation protrusion 42 can be integrally formed with the blade holder 24 to have a single-piece structure with respect to the blade holder 24. Therefore, advantageously, after the manufacture of the blade holder 24, the assembly of the blade holder 24 is not required.

[0103] Reference Figure 5 According to some embodiments of the subject matter of this application, the blade orientation protrusion 42 may be axially spaced from the front end surface 28 of the retainer. Advantageously, this allows the cutting blade 22 to be partially inserted (i.e., in the rearward direction D). R The cutting blade 22 extends up to, but not beyond, the front end of the blade orientation protrusion 42 into the blade receiving recess 38, as further described in the specification. Alternatively, the blade orientation protrusion 42 may be axially positioned adjacent to the front end surface 28 of the retainer (not shown). Note that, as discussed above, in both configurations, the cutting blade 22 may be inserted into the blade receiving recess 38 beyond the front end of the blade orientation protrusion 42 only at a predetermined angular position.

[0104] Reference Figure 6a and Figure 6b According to some embodiments of the subject matter of this application, such as a first notch cross-sectional view taken in the first notch radial plane RP1 passing through the fastener through-hole 54 ( Figure 6a The view seen in the image, or the cross-sectional view of the second notch taken in the radial plane RP2 of the second notch passing through the blade orientation protrusion 42. Figure 6bAs seen in [reference needed], the outer periphery of the blade receiving recess 38 lacks any drilled radial grooves designed as cooling channels, such as those disclosed, for example, in US 6,059,296. It is understood that the first recess radial plane RP1 and the second recess radial plane RP2 are perpendicular to the recess axis L, wherein the second recess radial plane RP2 is axially rearward of the first recess radial plane RP1. It is also noted that the manufacturing of the blade receiving recess 38 does not require internal grinding or drilling. Therefore, the manufacturing of the blade holder 24 is simple and inexpensive.

[0105] Reference Figure 3 and Figure 6a , Figure 6b According to some embodiments of the subject matter of this application, the blade orientation protrusion 42 may include two protruding side surfaces (a first protruding side surface 44a and a second protruding side surface 44b). The first protruding side surface 44a may extend from the outer peripheral surface 40 of the notch toward the second protruding side surface 44b, and vice versa. In the first notch cross-sectional view and the second notch cross-sectional view (i.e., Figure 6a and Figure 6b In at least one of the following configurations, the two protruding side surfaces 44a and 44b may converge toward each other in a direction from the outer peripheral surface 40 of the notch toward the axis L of the notch. The two protruding side surfaces 44a and 44b may be concavely curved. The two protruding side surfaces 44a and 44b may intersect each other. The two protruding side surfaces 44a and 44b may intersect each other at a protruding ridge 46. The protruding ridge 46 may form an axially extending edge. The protruding ridge 46 may extend axially parallel to the axis L of the notch.

[0106] like Figure 5 As seen in some embodiments of the subject matter of this application, the blade orientation protrusion 42 may include a front protrusion portion 48, a rear protrusion portion 50, and a middle protrusion portion 52 extending therebetween. The front protrusion portion 48 is positioned closer to the front end surface 28 of the retainer than the rear protrusion portion 50. Two protrusion side surfaces 44a, 44b and a protrusion ridge 46 may extend between the front protrusion portion 48 and the rear protrusion portion 50.

[0107] Based on some embodiments of the subject matter of this application, refer to Figure 3 and Figure 6a , Figure 6bThe blade receiving recess 38 may have an imaginary outer cylinder OC centered at the recess axis L (i.e., having its axis). The imaginary outer cylinder OC may touch the portion of the blade receiving recess 38 furthest from the recess axis L. In this non-limiting example shown in the figures, the imaginary outer cylinder OC may touch two portions of the blade receiving recess 38 on either side of the blade orientation protrusion 42. The blade receiving recess 38 may have an imaginary inner cylinder IC concentric with the imaginary outer cylinder OC and touch the portion of the blade receiving recess 38 closest to the recess axis L. In this non-limiting example shown in the figures, the imaginary inner cylinder IC may only touch the blade orientation protrusion 42. Therefore, the blade orientation protrusion 42 may be closer to the recess axis L than the rest of the blade receiving recess 38. In particular, the imaginary inner cylinder IC may only touch the protrusion ridge 46. In at least one of the first and second notched cross-sectional views, an annular region AA is formed in the area defined between the imaginary inner cylinder IC and the imaginary outer cylinder OC. The majority of the annular region AA may be empty (i.e., lacking material). Specifically, 70% of the annular region AA may be empty.

[0108] Second notch cross-sectional view ( Figure 6b In this embodiment, the blade orientation protrusion 42 defines a blade orientation protrusion angle range PE about the notch axis L. The blade orientation protrusion 42 extends circumferentially between two protrusion points PP. Specifically, the two protrusion points PP define a protrusion angle range PE about the notch axis L. According to some embodiments of the subject matter of this application, the two protrusion points PP may be the points where the two protrusion side surfaces 44a, 44b begin to deviate from the imaginary outer cylinder OC when they converge toward each other (where the two protrusion points PP are located on the imaginary outer cylinder OC). That is, the blade orientation protrusion 42 may protrude radially inward from the imaginary outer cylinder OC. The blade orientation protrusion angle range PE has a protrusion range angle α at the notch axis L. In other words, the two protrusion points PP may be opposite the protrusion range angle α from the notch axis L. The protrusion range angle α may be greater than or equal to 70° and less than or equal to 110°. The blade orientation protrusion 42 is mirror-symmetric about the axially bisecting plane BP, which includes the notch axis L and bisects the protrusion's range at angle α. Similarly, the blade receiving notch 38 is mirror-symmetric about the axially bisecting plane BP.

[0109] The blade mounting portion 32 includes a fastening member through-hole 54 that opens toward the outer peripheral surface 26 of the retainer and the outer peripheral surface 40 of the recess. The fastening member through-hole 54 is designed to receive a fastening member 25 such that the fastening member 25 can be pressed against and hold the cutting blade 22. According to some embodiments of the subject matter of this application, the blade mounting portion 32 may include exactly one fastening member through-hole 54 that opens toward the outer peripheral surface 26 of the retainer and the outer peripheral surface 40 of the recess. The fastening member through-hole 54 may open toward the outer peripheral surface 40 of the recess adjacent to the blade orientation protrusion 42 (just axially anterior to the blade orientation protrusion 42). Preferably, the fastening member through-hole 54 may open toward the outer peripheral surface 40 of the recess adjacent to the leading end portion 48 of the protrusion. Advantageously, with this configuration, the blade retainer 24 is reinforced in areas where the blade retainer 24 is weakened by removing material required for the fastening member through-hole 54. In this type of construction, the fastening member through hole 54 is located between the front end surface 28 of the retainer and the blade orientation protrusion 42.

[0110] The fastening component through-hole 54 extends along the through-hole axis T. According to some embodiments of the subject matter of this application, the through-hole axis T may be oriented perpendicular to and intersect with the notch axis L. The through-hole axis T may be contained within an axially bisecting plane BP.

[0111] The fastening member through-hole 54 includes a through-hole outer peripheral surface 56 extending between the retainer outer peripheral surface 26 and the recess outer peripheral surface 40. The through-hole outer peripheral surface 56 extends circumferentially about the through-hole axis T. According to some embodiments of the subject matter of this application, the through-hole outer peripheral surface 56 may include an internal threaded portion 58 for threaded engagement of a corresponding threaded portion on the fastening member 25.

[0112] Reference Figure 6aAccording to some embodiments of the subject matter of this application, in a first notch cross-sectional view, the outer peripheral surface 56 of the through hole forms a through hole profile 60, which includes two opposing through hole profile lines 61. The two through hole profile lines 61 are located on either side of the through hole axis T. Each through hole profile line 61 extends to (intersects with) the outer peripheral surface 40 of the notch at a corresponding one of the two through hole points TP. The two through hole points TP define a through hole angle range TE about the notch axis L. The through hole angle range TE has a through hole range angle δ at the notch axis L. Each through hole profile line 61 extends along a corresponding imaginary through hole line 61a. The fastening member through hole 54 has a through hole width W, which is measured between the two opposing through hole profile lines 61 (and therefore between the protruding imaginary through hole lines 61a). The through hole width W is measured perpendicular to both the notch axis L and the through hole axis T. The outer peripheral surface 40 of the notch includes a secondary peripheral portion 63 that extends between the two opposing through hole profile lines 61. In other words, the secondary peripheral portion 63 is located between the two through-hole points TP. It is understood that the secondary peripheral portion of the notch peripheral surface 40 is a part whose angular range around the notch axis L is smaller than the angular range of the remaining (primary) portion of the notch peripheral surface 40.

[0113] In the first notch section view (i.e., Figure 6a In this embodiment, the blade orientation protrusion 42 is formed on at least a portion of the secondary outer peripheral portion 63. According to some embodiments of the subject matter of this application, the blade orientation protrusion 42 may be formed over the entire secondary outer peripheral portion 63. The first notch radial plane RP1 may be located where the fastening member through-hole 54 has its maximum width. That is, the through-hole width W may be maximum at the first notch radial plane RP1. The first notch radial plane RP1 may include the through-hole axis T.

[0114] The blade orientation protrusion angle range PE overlaps at least partially at an angle with the through-hole angle range TE about the notch axis L. In this non-limiting example shown in the figures, the through-hole angle range TE is completely contained within the blade orientation protrusion angle range PE. In other words, the blade orientation protrusion angle range PE overlaps completely at an angle with the through-hole angle range TE about the notch axis L. In this configuration, the through-hole range angle δ is smaller than the protrusion range angle α.

[0115] Reference Figure 3According to some embodiments of the subject matter of this application, the blade receiving notch 38 may include a plurality of notch-adjacent protrusions 62 that project from the outer peripheral surface 40 of the notch relative to the fastening member through-hole 54. The plurality of notch-adjacent protrusions 62 are designed to abut corresponding surfaces on the cutting blade 22. The plurality of notch-adjacent protrusions 62 are located on the side of a diametrical plane D opposite to the blade orientation protrusion 42, wherein the diametrical plane D is perpendicular to the axially bisecting plane BP in an end view of the blade holder 24 and extends through the diameter of the imaginary outer cylinder OC. Generally, the plurality of notch-adjacent protrusions 62 project toward the notch axis L. Figure 8b As seen in the image, multiple notches adjacent to protrusions 62 can be positioned in the forward direction D. F It extends upward toward the front end surface 28 of the retainer.

[0116] Back Figure 3 According to some embodiments of the subject matter of this application, a plurality of notch-adjacent protrusions 62 may be angularly spaced from each other about the notch axis L and angularly spaced from the blade orientation protrusion 42.

[0117] According to some embodiments of the subject matter of this application, each notch abutment protrusion 62 may include a notch abutment surface 64 for abutting a corresponding surface on the cutting blade 22. The notch abutment surface 64 may be symmetrical about the axially bisecting plane BP. Each notch abutment surface 64 may be planar. The notch abutment surface 64 may be planar along the notch axis L in the forward to backward direction D. F D R Extending upwards. Each notch abutment surface 64 may include two notch abutment sub-surfaces (not shown) axially spaced apart from each other along the notch axis L by a recessed surface (also not shown). In the axial direction, a fastening member through-hole 54 may be located between the two notch abutment sub-surfaces. Each notch abutment surface 64 may define an abutment surface angle range AE about the notch axis L. The abutment surface angle range AE has an abutment surface range angle γ at the notch axis L.

[0118] According to some embodiments of the subject matter of this application, a plurality of notched adjacent protrusions 62 may include exactly two notched adjacent protrusions 62 spaced at an angle. For example... Figure 3 As seen in the image, the two adjacent surfaces 64 of the notch can form an adjacency clamping angle β between them. The adjacency clamping angle β can be greater than 45° and less than 135°. This provides a robust and accurate mounting of the cutting blade 22 in the blade receiving notch 38. Each adjacent blade orientation protrusion 42 and the notch abutment surface 64 can be angularly spaced about the notch axis L.

[0119] Now refer to Figures 12 to 14This illustration shows a cutting blade 22 according to the subject matter of a second aspect of this application. The cutting blade 22 is integrally formed to have a monolithic, one-piece structure. The cutting blade 22 includes two opposing blade end surfaces 86 and a blade outer peripheral surface 88 extending between the two blade end surfaces 86. The blade outer peripheral surface 88 intersects with the two blade end surfaces 86 and forms the boundary of the two blade end surfaces 86. The blade outer peripheral surface 88 extends circumferentially about a longitudinal axis A of the blade. The blade longitudinal axis A defines the length direction of the cutting blade 22, i.e., the direction in which the cutting blade 22 extends and has its longest dimension. According to some embodiments of the subject matter of this application, the cutting blade 22 may lack a through hole for receiving a retaining screw.

[0120] The cutting blade 22 includes a cutting portion 90 and a shank portion 92 offset therefrom in an axial direction. The cutting portion 90 is located at the leading end of the cutting blade 22. In the illustrated embodiment, the cutting portion 90 is oriented eccentrically relative to the shank portion 92. In other words, the cutting portion 90 and the shank portion 92 are not connected at the center of the latter.

[0121] The cutting portion 90 of the blade includes a cutting edge 96 formed at the intersection of the front cutting surface 97a and the clearance surface 97b. The cutting edge 96 is oriented to perform internal grooving or drilling.

[0122] Reference Figure 13 According to some embodiments of the subject matter of this application, the outer peripheral surface 88 of the blade at the blade shank portion 92 may include a planar blade shank flat surface 102. The blade shank flat surface 102 may extend to the blade end surface 86, which is positioned opposite the blade cutting portion 90, thereby forming an insertion notch 104. The blade shank flat surface 102 may be parallel to the blade longitudinal axis A. The outer peripheral surface 88 of the blade at the blade shank portion 92 may include a blade shank cylindrical surface 100 located on an imaginary cylinder having the blade longitudinal axis A as its central axis. The blade shank cylindrical surface 100 may connect to the opposite circumferential ends of the blade shank flat surface 102. Thus, the insertion notch 104 may constitute a chordal surface formed on the cylindrical shank portion 92. Cutting blades of the type described above are known in the art. For example, DE202017005713 U1 discloses such cutting blades. By using spacers, the blade receiving notch 38 can be configured to receive different cutting blades 22 having blade shank portions 92 of different lengths.

[0123] Now return to the reference. Figure 2According to some embodiments of the subject matter of this application, the fastening member 25 may include an externally threaded portion 106. The fastening member 25 may be a clamping screw. The fastening member 25 may include a fastening member end abutment surface 108 and a fastening member actuating portion 110, located on either side of the externally threaded portion 106. The fastening member actuating portion 110 is designed to receive a key (such as an Allen wrench) for moving the fastening member 25 along the through-hole axis T. The fastening member end abutment surface 108 is designed to clamply engage the cutting blade 22. The fastening member end abutment surface 108 may be planar.

[0124] Now refer to Figures 7 to 11 The image shows a cutting tool 20 according to the subject matter of a third aspect of this application. The cutting tool 20 is adjustable between an initial position and a fastened position.

[0125] At the initial position of the cutting tool 20 (i.e., Figure 2 The cutting blade 22 is spaced apart from and axially aligned with the blade receiving recess 38 of the blade holder, in preparation for insertion into the latter.

[0126] In a configuration (not shown) in which the blade orientation protrusion 42 is axially adjacent to the front end surface 28 of the retainer, the blade orientation protrusion 42 can prevent the cutting blade 22 from being inserted into the blade receiving recess 38.

[0127] Reference Figure 7-7c In the configuration where the blade orientation protrusion 42 and the front end surface 28 of the retainer are axially spaced apart, the cutting blade 22 can be partially inserted (in the rearward direction D) R The cutting tool 20 is partially inserted into the blade receiving recess 38, extending up to (i.e., adjacent to, but not exceeding) the front portion 48 of the blade orientation protrusion 42. Advantageously, once partially inserted, the cutting blade 22 is less likely to fall out of the blade holder 24. Furthermore, the blade orientation protrusion 42 prevents the cutting blade 22 from further inserting into the blade receiving recess 38. Figures 7a-7c In the non-limiting example shown, the cutting blade 22 is "inverted" (i.e., the insertion cut 104 is offset by an angle of up to 180° from the blade orientation protrusion 42).

[0128] From the initial or partial insertion position, the cutting blade 22 is rotated about its longitudinal axis as needed, such that the insertion cut 104 is positioned adjacent to and angled to the blade orientation protrusion 42 (i.e., achieving a predetermined angular position). The blade shank portion 92 then moves in the rearward direction D RInserted into the blade receiving recess 38, beyond the protruding front portion 48 of the blade orientation protrusion 42, until the blade end surface 86 at the blade shank portion 92 contacts the recess stop surface 41. This results in the insertion position of the cutting tool 20 ( Figure 8a ).

[0129] Reference Figure 8b In the insertion position of the cutting tool 20, the flat surface 102 of the blade shank can face the blade orientation protrusion 42. The blade orientation protrusion 42 can be located in the insertion notch 104. The fastening member 25 is not located in the fastening member through hole 54 (or at least does not protrude into the blade receiving recess 38). Figure 8c As shown, the blade orientation protrusion 42 prevents the cutting blade 22 from rotating about the blade's longitudinal axis A. According to some embodiments of the subject matter of this application, a portion of the flat surface 102 of the blade shank may be spaced apart from the blade orientation protrusion 42. A portion of the cylindrical surface 100 of the blade shank may contact the recessed abutment surface 64.

[0130] Reference Figure 9-11 In the fastened position of the cutting tool 20, the cutting blade 22 is releasably attached to the blade holder 24 via the fastening member 25. Specifically, the blade shank portion 92 is located in the blade receiving recess 38, in the rearward direction D R The protruding front portion 48 extends beyond the blade orientation protrusion 42. The cutting blade 22 is releasably held in the blade receiving recess 38 by a fastening member 25 located in the fastening member through-hole 54. According to some embodiments of the subject matter of this application, the external threaded portion 106 may thread-engage with the internal threaded portion 58. Each recess abutment surface 64 may abut a corresponding portion of the cylindrical surface 100 of the blade shank. The fastening member 25 may abut a portion of the flat surface 102 of the blade shank. Preferably, the end abutment surface 108 of the fastening member may form face-to-face contact with the flat surface 102 of the blade shank, thereby providing a precise center height position to the cutting blade 22. The longitudinal axis A of the blade may coincide with the axis L of the recess (and the longitudinal axis B of the retainer).

[0131] Note that the fastening position of the cutting tool 20 is not a shrink-fit connection, as disclosed, for example, in US 8,656,573 and US9,254,525. Therefore, the cutting tool 20 is a non-shrink-fit cutting tool, and the blade 22 and the blade holder 24 form a non-shrink-fit connection.

[0132] It should also be noted that cutting blades with shank portions of different diameters can be mounted to the same blade holder 24. That is, even when a smaller diameter shank is inserted, the fastening member 25 will be further screwed into the fastening member through hole 54 until it finally reaches and engages the flat surface 102 of the shank and clamps the blade 22 into contact with the recessed abutment surface 64.

[0133] Reference Figure 8a , Figure 8b and Figure 11 According to some embodiments of the subject matter of this application, in the fastened position of the cutting tool 20, the cutting tool 20 may include at least one coolant channel 112 formed by a gap 123 between the outer peripheral surface 88 of the blade and the outer peripheral surface 40 of the notch. The coolant channel 112 serves to guide cooling fluid to the cutting edge 96. At least one coolant channel 112 includes a coolant channel inlet opening 114, through which cooling fluid enters the coolant channel 112. The coolant channel inlet opening 114 may be located at the rear end surface 29 of the retainer. At least one coolant channel 112 also includes a coolant channel outlet opening 116, through which cooling fluid exits the coolant channel 112. The coolant channel inlet opening 114 and the coolant channel outlet opening 116 are in fluid communication with each other. The coolant channel outlet opening 116 may be located at the front end surface 28 of the retainer. Note that in such embodiments, the blade receiving notch 38 is a through-hole, wherein the blade receiving notch 38 opens toward the rear end surface 29 of the retainer.

[0134] By means of the aforementioned overlap of the blade orientation protrusion angle range PE and the through-hole angle range TE, the fastening member 25, when actuated, moves freely through the insertion notch 104 and initially abuts the flat surface 102 of the blade shank (or the intersection of the flat surface 102 of the blade shank and the cylindrical surface 100 of the blade shank). Further actuation of the fastening member 25 causes the cutting blade 22 to rotate about the blade's longitudinal axis A. Note that the fastening member 25 does not initially abut the cylindrical surface 100 of the shank, which would not cause the aforementioned rotation. In the configuration where the end abutment surface 108 of the fastening member is planar, the cutting blade 22 rotates until surface-to-surface contact is achieved between the end abutment surface 108 of the fastening member and the flat surface 102 of the blade shank, which provides a secure clamping.

[0135] Although the subject matter of this application is described with a degree of specificity, it should be understood that various changes and modifications can be made without departing from the spirit or scope of the invention as claimed below.

Claims

1. A blade holder (24) having a blade receiving recess with a blade orientation protrusion, having defined opposite forward directions (D) F ) and backward direction (D) R The blade retainer (24) comprises: longitudinal axis (B) of the retainer. The retainer outer peripheral surface (26) extends circumferentially about the longitudinal axis (B) of the retainer, the retainer outer peripheral surface (26) intersects with the retainer front end surface (28) at the front end of the blade retainer (24) and forms the boundary of the retainer front end surface (28); The retainer shank portion (30) and the blade mounting portion (32) located at its front end, the blade mounting portion (32) comprising: A blade receiving recess (38) extending along a recess axis (L) and opening toward the front end surface (28) of the retainer, the blade receiving recess (38) including a recess outer peripheral surface (40) extending circumferentially about the recess axis (L) and a blade orientation protrusion (42) protruding from the recess outer peripheral surface (40) into the blade receiving recess (38); and The fastening component has a through-hole (54) that opens toward the outer peripheral surface (26) of the retainer and the outer peripheral surface (40) of the recess, and includes a through-hole outer peripheral surface (56) extending therebetween, wherein: In the first notch cross-sectional view taken in the radial plane (RP1) of the first notch passing through the through hole (54) of the fastening component: The outer peripheral surface (56) of the through hole forms a through hole profile (60), which includes two opposing through hole profile lines (61); and The through-hole profile (61) intersects the outer peripheral surface (40) of the notch at two through-hole points (TP), the two through-hole points (TP) defining the through-hole angle range (TE) around the axis (L) of the notch; and In the second notch cross-sectional view taken in the radial plane (RP2) of the second notch passing through the blade orientation protrusion (42): The blade orientation protrusion (42) has a blade orientation protrusion angle range (PE) around the axis (L) of the notch; wherein: The second notch radial plane (RP2) is axially rearward of the first notch radial plane (RP1); and The blade orientation protrusion angle range (PE) overlaps at least partially with the through hole angle range (TE) around the notch axis (L); The blade receiving notch (38) has an imaginary outer cylinder (OC) centered at the notch axis (L) and touching the part of the blade receiving notch (38) furthest from the notch axis (L). The blade receiving recess (38) has an imaginary inner cylinder (IC) that is concentric with the imaginary outer cylinder (OC) and touches the portion of the blade receiving recess (38) closest to the recess axis (L); and In at least one of the first notch cross-sectional view and the second notch cross-sectional view, an annular region (AA) is formed in the area defined between the imaginary inner cylinder (IC) and the imaginary outer cylinder (OC), and the annular region (AA) is mostly empty.

2. The blade holder (24) according to claim 1, wherein: The fastening component through-hole (54) has a through-hole width (W) measured between two opposing through-hole profiles (61); and The width (W) of the through hole is the largest at the radial plane (RP1) of the first notch.

3. The blade holder (24) according to claim 1, wherein, 70% of the annular region (AA) is empty.

4. The blade holder (24) according to claim 1, wherein, The imaginary inner cylinder (IC) only touches the blade orientation protrusion (42).

5. The blade holder (24) according to claim 1, wherein: The blade orientation protrusion (42) includes two protrusion side surfaces (44a, 44b); and In at least one of the first and second notch cross-sectional views, the two protruding side surfaces (44a, 44b) converge toward each other in a direction from the outer peripheral surface (40) of the notch toward the notch axis (L).

6. The blade holder (24) according to claim 5, wherein, The blade orientation protrusion angle range (PE) is defined by two protrusion points (PP), which are the points where the two protrusion side surfaces (44a, 44b) begin to deviate from the imaginary outer cylinder (OC) as they converge toward each other.

7. The blade holder (24) according to claim 5, wherein, In at least one of the first notch cross-sectional view and the second notch cross-sectional view, the two protruding side surfaces (44a, 44b) are concavely curved.

8. The blade holder (24) according to claim 5, wherein, The two protruding side surfaces (44a, 44b) intersect each other at the protruding ridge (46) extending along the axis (L) of the notch.

9. The blade holder (24) according to claim 8, wherein, The protruding ridge (46) is parallel to the axis (L) of the notch.

10. The blade holder (24) according to claim 1, wherein: The blade azimuth protrusion angle range (PE) has a protrusion range angle (α) at ​​the notch axis (L); and The protrusion range angle (α) is greater than or equal to 70° and less than or equal to 110°.

11. The blade holder (24) according to claim 1, wherein, The blade orientation protrusion (42) is axially spaced from the front end surface (28) of the retainer.

12. The blade holder (24) according to claim 1, wherein, The fastening component through hole (54) opens toward the outer peripheral surface (40) of the notch adjacent to the blade orientation protrusion (42).

13. The blade holder (24) according to claim 12, wherein: The blade orientation protrusion (42) includes a front end portion (48) and a rear end portion (50) and a middle portion (52) extending therebetween, the front end portion (48) being positioned closer to the front end surface (28) of the retainer than the rear end portion (50); and The fastening member through hole (54) opens toward the outer peripheral surface (40) of the recess adjacent to the front end portion (48) of the protrusion.

14. The blade holder (24) according to claim 1, wherein, The blade orientation protrusion (42) is integrated with the blade holder (24) to have an integral monolithic structure with respect to the blade holder (24).

15. The blade holder (24) according to claim 1, wherein, The blade receiving recess (38) includes a plurality of recess-adjacent protrusions (62) that protrude from the outer peripheral surface (40) of the recess opposite to the fastening member through hole (54). The plurality of recess-adjacent protrusions (62) are angularly spaced from each other and angularly spaced from the blade orientation protrusion (42) about the recess axis (L). Each recess-adjacent protrusion (62) includes a recess-adjacent surface (64).

16. The blade holder (24) according to claim 15, wherein, The plurality of notched adjacent protrusions (62) extend toward the front end surface (28) of the retainer along the forward direction (DF).

17. The blade holder (24) according to claim 15, wherein, The plurality of notched adjacent protrusions (62) includes exactly two notched adjacent protrusions (62).

18. The blade holder (24) according to claim 1, wherein, The outer peripheral surface (56) of the through hole includes an internal thread portion (58).

19. The blade holder (24) according to claim 1, wherein, The retainer handle portion (30) includes at least one handle peripheral connection arrangement (34), each handle peripheral connection arrangement (34) including two pairs of diametrically opposed planar handle peripheral abutment surfaces (36) located on the retainer peripheral surface (26), the components of each pair being parallel to each other and parallel to the longitudinal axis (B) of the retainer.

20. A cutting tool (20) comprising: The blade holder (24) according to claim 1; as well as A cutting blade (22) extends along the longitudinal axis (A) of the blade and includes a cutting portion (90) and a shank portion (92) offset axially from it, wherein: The cutting tool (20) can be adjusted between the following positions: Initial position, where: The cutting blade (22) is spaced apart from and axially aligned with the blade receiving recess (38) of the blade holder, and Fastening positions, including: The blade shank portion (92) is located in the blade receiving recess (38), in the rearward direction (D R The front portion (48) of the protrusion extending beyond the blade orientation protrusion (42); and The cutting blade (22) is releasably held in the blade receiving recess (38) by a fastening member (25) located in the fastening member through hole (54).

21. The cutting tool (20) according to claim 20, wherein: The fastening component through hole (54) includes an internal thread portion (58); The fastening component (25) includes an externally threaded portion (106); and At the fastened position of the cutting tool (20), the external thread portion (106) is threadedly engaged with the internal thread portion (58).

22. The cutting tool (20) according to claim 20, wherein: The cutting blade (22) includes two blade end surfaces (86) and a blade outer peripheral surface (88) extending therebetween about the longitudinal axis (A) of the blade, the blade outer peripheral surface (88) at the blade shank portion (92) including: A planar blade shank flat surface (102) extends to the blade end surface (86), the blade end surface (86) being positioned opposite the blade cutting portion (90), thereby forming an insertion notch (104); and A cylindrical surface (100) of the blade shank is located on an imaginary shank cylinder and connects to the opposite circumferential end of the flat surface (102) of the blade shank.

23. The cutting tool (20) according to claim 22, wherein, The flat surface (102) of the blade shank is parallel to the longitudinal axis (A) of the blade.

24. The cutting tool (20) according to claim 22, wherein: The blade orientation protrusion (42) is axially spaced from the front end surface (28) of the retainer; The cutting tool (20) can also be adjusted to a partial insertion position between the initial position and the fastening position; and wherein in the partial insertion position; The blade shank portion (92) in the rearward direction (D) R The upper part is inserted into the blade receiving recess (38) until the protruding front end portion (48) of the blade orientation protrusion (42).

25. The cutting tool (20) according to claim 22, wherein: The cutting tool (20) can also be adjusted to an insertion position between the initial position and the fastening position, and in the insertion position: The insertion notch (104) is angled to the blade orientation protrusion (42) around the notch axis (L), and the blade receiving notch (38) extends along the notch axis (L); as well as The blade shank portion (92) is located in the blade receiving recess (38), in the rearward direction (D R The front end portion (48) of the protrusion that extends beyond the blade orientation protrusion (42).

26. The cutting tool (20) according to claim 22, wherein: The blade receiving recess (38) includes a plurality of recess-adjacent protrusions (62) that protrude from the outer peripheral surface (40) of the recess opposite to the fastening member through hole (54). The plurality of recess-adjacent protrusions (62) are angularly spaced from each other and from the blade orientation protrusion (42) about the recess axis (L). The blade receiving recess (38) extends along the recess axis (L), and each recess-adjacent protrusion (62) includes a recess-adjacent surface (64). At the fastening position of the cutting tool (20): Each notch abutting surface (64) abuts a corresponding portion of the cylindrical surface (100) of the blade shank; and The fastening component (25) is adjacent to a portion of the flat surface (102) of the blade shank.

27. The cutting tool (20) according to claim 24, wherein: At the fastened position of the cutting tool (20), the cutting tool (20) includes at least one coolant channel (112) formed by a gap (123) between the outer peripheral surface (88) of the blade and the outer peripheral surface (40) of the notch; and The at least one coolant passage (112) includes a coolant passage inlet opening (114) and a coolant passage outlet opening (116) that are in fluid communication with each other.

28. The cutting tool (20) according to claim 27, wherein, The coolant channel outlet opening (116) is located on the front end surface (28) of the retainer.

Images