Cutting insert with cooling channel feature

Abstract

A cutting insert includes a corner cutting region and a cooling channel formed in a wall cavity. The cutting insert includes a body having an upper insert surface, a lower insert surface defining a lower insert plane, and at least one sidewall extending between the upper insert surface and the lower insert surface. The corner cutting region is defined between the at least one sidewall and the upper insert surface. The at least one side wall is formed with at least one cooling channel formed in a wall cavity defining a coolant flow path having an upstream section with a coolant inlet facing the lower blade plane. The coolant flow path also has a downstream section extending below the corner cut region. The coolant flow path is at least partially exposed to an exterior of the cutting insert and includes an arcuate portion between the upstream section and the downstream section.

Description

Technical Field

[0001] The subject matter disclosed in this article generally relates to cutting tools and cutting inserts, and in particular to cutting tools and cutting inserts that include external cooling channels. Background Technology

[0002] The following is a list of references considered relevant to the background art of the currently disclosed topic: - US9095913B2 - US9656323B2 - US 2021 / 0205895A1 - WO 2023 / 079549A1 The acknowledgment of the above references in this document should not be construed as implying that these references are in any way related to the patentability of the currently disclosed subject matter. Background of the Invention It is known in the art to direct cooling fluid (i.e., coolant) to the cutting interface of the cutting tool during a cutting operation on a workpiece. During the cutting operation, directing the coolant prevents the cutting tool from contacting the workpiece and cooling the cutting interface, thereby preventing damage to both the cutting edge and the workpiece.

[0004] Generally, a cutting tool has a rake face and at least one flank face or flange face, which define the cutting edge of the tool at their intersection. Cooling fluid is typically directed onto the rake face from the side, or from the side of the flank face, or from the direction in which coolant is applied to the two faces forming the cutting edge.

[0005] Cutting tools may also include cutting inserts that perform the actual machining or cutting operations on the surface of a workpiece. Such cutting inserts are associated with a separate cooling arrangement structure configured to supply coolant to the cutting inserts from the outside.

[0006] Conventional cutting inserts may have a cutting corner region defined between a first side surface, a second side surface, and one of an upper surface and a lower surface. A cooling cavity, including a cooling surface adjacent to the cutting corner region, is configured to receive coolant therein for cooling the interface between the cutting insert and the workpiece, and thereby extracting heat from the cutting corner region.

[0007] Typically, the entire cutting corner area is coated to increase durability; however, the coating may reduce the thermal conductivity of the cooling surface, thereby diminishing its effectiveness. Therefore, the object of this disclosure is to increase the thermal conductivity of the cooling surface by leaving the coating material outside the remaining portion of the cutting corner area. Summary of the Invention

[0008] Therefore, an embodiment of the subject matter disclosed herein provides a cutting insert. The cutting insert according to the subject matter disclosed herein includes a body having an upper insert surface, a lower insert surface defining a lower insert plane, and at least one sidewall extending between the upper and lower insert surfaces. The cutting insert also includes at least one corner cutting region defined between the at least one sidewall and the upper insert surface.

[0009] In some embodiments, the at least one sidewall is formed with at least one cooling channel defining a coolant flow path extending between an upstream section and a downstream section, the upstream section having a coolant inlet facing the lower blade plane, and the downstream section extending below the at least one corner cutting area. In some embodiments, the coolant flow path is at least partially exposed to the outside of the cutting blade and includes an arcuate portion located between the upstream and downstream sections.

[0010] In some embodiments, the arcuate portion is characterized by forming a single smooth curve along at least a portion of the coolant flow path. In some embodiments, the single smooth curve extends along a planar dimension parallel to at least one sidewall. In some embodiments, the arcuate portion generates pressure in the coolant it guides, thereby increasing the coolant flow along the coolant flow path to increase heat removal at corner cutting areas. In some embodiments, the arcuate portion is rounded in at least a portion of itself in three dimensions.

[0011] In some embodiments, the arcuate portion has a decreasing radius at least along a portion of the coolant flow path extending from the upstream segment toward the downstream segment, the decreasing radius corresponding to the increased centrifugal force along that portion of the coolant flow path. In some embodiments, the single smooth curve has a radius that increases from the upstream segment toward the downstream segment in a dimension transverse to the coolant flow path.

[0012] In some embodiments, the arcuate portion extends along the coolant flow path across an arc length of at least 90 degrees. In some embodiments, the arcuate portion extends along the coolant flow path across an arc length greater than 90 degrees. In some embodiments, the arcuate portion extends across an arc length in the range of 105 to 125 degrees. In some embodiments, the arcuate portion is configured to guide coolant downward along the coolant flow path at corner cutting areas to enhance heat removal at corner cutting areas.

[0013] In some embodiments, a cooling channel is formed in a wall cavity, at least a portion of which is exposed to the outside of the cutting blade. In some embodiments, a large portion of the coolant flow path is exposed to the outside of the cutting blade. In some embodiments, a large portion of the coolant flow path is exposed towards the downstream section, and a small portion of the coolant flow path is closed towards the upstream section. In some embodiments, the coolant flow path at the upstream section is closed relative to the outside. In some embodiments, the coolant flow path thus includes an exposed portion and a closed portion along it, which together form a combined coolant flow.

[0014] In some embodiments, the coolant flow path becomes increasingly exposed from the upstream segment toward the downstream segment. In some embodiments, the outer wall portion closes the coolant inlet at the upstream segment. In some embodiments, the outer wall portion slopes toward the arcuate portion, thereby forming a smooth transition with the arcuate portion at a smooth transition point between the upstream and downstream segments. In some embodiments, the coolant inlet includes an inlet radius. In some embodiments, the outer wall portion slopes relative to the coolant inlet to increase the width of the coolant flow path relative to the inlet radius as the coolant is guided along the coolant flow path toward the downstream segment.

[0015] In some embodiments, the cooling channel further includes an arcuate-banked portion extending along the arcuate portion, the arcuate-banked portion sloping from the arcuate portion toward the inner cavity surface of the wall cavity to guide coolant along it. In some embodiments, the inner cavity surface is parallel to the coolant flow path. In some embodiments, the inner cavity surface extends parallel to the sidewall surface of the sidewall.

[0016] In some embodiments, the coolant inlet has an inlet diameter configured to receive coolant from a coolant outlet in fluid communication with the coolant inlet. In some embodiments, the coolant outlet has an outlet diameter corresponding to the inlet diameter. In some embodiments, the corner cutting region includes a corner slope portion configured to redirect coolant below the corner cutting region.

[0017] In some embodiments, the sidewalls include opposing sidewall portions that are angled relative to each other. In some embodiments, the opposing sidewall portions together define a bifurcated wall cavity below the corner cutting region. In some embodiments, the bifurcated wall cavity includes opposing cooling channels that are in fluid communication with each other. In some embodiments, the opposing cooling channels together define a bifurcated cooling channel flow path, the opposing portions of which are angled relative to each other and toward the corner cutting region.

[0018] In some embodiments, the intermediate insert plane extends orthogonally relative to the upper and lower insert surfaces. In some embodiments, the bifurcation cavity is symmetrical about the intermediate insert plane. In some embodiments, the opposing cooling channels formed in the bifurcation cavity are symmetrical about the intermediate insert plane. In some embodiments, the corner cutting region includes a rake face located on the upper insert surface and a flank face located on the sidewall surface, thereby providing at least one cutting edge on the upper insert surface. In some embodiments, at least one cooling channel extends from the flank face to the lower insert surface.

[0019] In some embodiments, the corner cutting region includes opposing cutting edges that are angled relative to each other. In some embodiments, the corner cutting region includes a curved cutting edge located between the opposing cutting edges. In some embodiments, the corner cutting region includes a tapered portion spaced apart from the curved cutting edge above a corner slope portion. In some embodiments, the body is rhomboid in shape, having an acute angle at the corner cutting region and a blade corner opposite the corner cutting region.

[0020] In some embodiments, the cooling channel is configured to be opposite the workpiece during cutting operations. In some embodiments, the workpiece includes an inner workpiece surface. In some embodiments, the cooling channel and the inner workpiece surface are configured together to redirect coolant within the space defined therebetween. Attached Figure Description

[0021] Other features and purposes of the subject matter disclosed herein will become clearer by taking into account the following accompanying drawings submitted to support this specification.

[0022] Figure 1 This is a front top perspective view of a first cutting tool with a cutting insert mounted according to this disclosure.

[0023] Figure 2 This is a top plan view of a first cutting tool with a cutting insert mounted according to this disclosure.

[0024] Figure 3 This is a side front view of a first cutting tool with a cutting insert mounted according to this disclosure.

[0025] Figure 4 It is an exploded top perspective view of a first cutting tool according to the present disclosure, wherein the cutting insert is shown as disassembled from various parts of the cutting tool.

[0026] Figure 5 This is a top perspective view of a cutting tool holder on which a cutting insert is mounted, according to the present disclosure.

[0027] Figure 6 This is a top plan view of a cutting tool holder on which a cutting insert is mounted, according to the present disclosure.

[0028] Figure 7 This is a front perspective view of a cutting tool holder on which a cutting insert is mounted, according to the present disclosure.

[0029] Figure 8 This is a rear perspective view of a cutting tool holder on which a cutting insert is mounted, according to the present disclosure.

[0030] Figure 8 This is a rear perspective view of a cutting tool holder on which a cutting insert is mounted, according to the present disclosure.

[0031] Figure 9 This is a rear perspective view of a cutting tool holder on which a cutting insert is mounted according to the present disclosure, depicting in dashed lines the internal structure according to the present disclosure, which includes conduits for delivering coolant to the cutting insert.

[0032] Figure 10 This is a bottom perspective view of the blade holder on which the cutting blade is mounted, according to the present disclosure.

[0033] Figure 11 This is a top perspective view of the insert holder on which the cutting insert is mounted, according to the present disclosure.

[0034] Figure 12 This is an enlarged front-top perspective view of the cutting insert according to the present disclosure, which depicts the cooling cavity formed therein.

[0035] Figure 13 The front view of the cutting insert according to this disclosure depicts the cooling cavity formed therein.

[0036] Figure 14 It is a top view of the cutting insert according to this disclosure.

[0037] Figure 15 It is a bottom view of the cutting insert according to this disclosure.

[0038] Figure 16 This is a partially enlarged bottom perspective view of the upper part of the cooling chamber of the cutting blade, which is magnified to show the associated features in more detail.

[0039] Figure 17 This is an enlarged partial side front view of the cutting blade according to the present disclosure, to show the features of its cooling channels in more detail.

[0040] Figure 18 This is an enlarged partial bottom view of the cutting blade according to the present disclosure, to show the features of its cooling channels in more detail.

[0041] Figure 19This is a front top perspective view of a cutting insert and insert holder in an assembly relationship according to this disclosure.

[0042] Figure 20 This is a side top perspective view of a cutting insert and insert holder in an assembly relationship according to this disclosure.

[0043] Figure 21 This is a partially enlarged top perspective view of the lower part of the cooling chamber of the cutting blade, which is magnified to show the associated features in more detail.

[0044] Figure 22 This is a bottom perspective view of a cutting insert and insert holder that are arranged adjacent to a workpiece in an assembly relationship according to this disclosure.

[0045] Figure 23 This is a top perspective view of the cutting insert and insert holder, which are arranged adjacent to the workpiece in an assembly relationship according to this disclosure.

[0046] Figure 24 This is a side front view of a cutting insert and insert holder that are arranged adjacent to a workpiece in an assembly relationship according to this disclosure.

[0047] Figure 25 yes Figures 22 to 24 The other depiction is a top perspective view of the workpiece, which shows the inner surface of the workpiece with chips partially removed.

[0048] Figure 26 yes Figures 22 to 25 The workpiece is also depicted in a side front view, showing the inner surface of the workpiece with chips partially removed.

[0049] Figure 27 This is a side front view of a milling tool with an array of mounted cutting blades, based on the subject matter disclosed herein.

[0050] Figure 28 This is a top plan view of a milling tool with an array of mounted cutting blades, based on the subject matter disclosed herein.

[0051] Figure 29 This is a bottom view of a milling tool with an array of cutting blades mounted on it, based on the subject matter disclosed herein.

[0052] Figure 30 This is a partial top perspective view of a milling tool according to the subject matter disclosed herein, showing the coolant inlet located at the tool end.

[0053] Figure 31 This is a bottom perspective view of a milling tool with an array of cutting blades mounted on it, based on the subject matter disclosed herein.

[0054] Figure 32 This is a first enlarged bottom perspective view of an exemplary cutting insert mounted to a milling tool according to the subject matter disclosed herein.

[0055] Figure 33 This is a second enlarged bottom perspective view of an exemplary cutting insert mounted on a milling tool according to the subject matter disclosed herein.

[0056] Figure 34 This is an enlarged bottom perspective view of an exemplary insert support portion of a milling tool, from which the cutting insert is removed to better expose the coolant outlet formed in the insert support portion.

[0057] Figure 35 It is installed based on the topic disclosed in this article. Figure 34 A third enlarged bottom perspective view of an exemplary cutting blade, depicting the blade support portion, is shown in the image. Detailed Implementation

[0058] Now, please refer to the accompanying diagram for more specific details. The reader should first refer to... Figures 1 to 4 The document generally depicts an arrangement of a first cutting tool 10 incorporating cutting inserts 11 according to the subject matter disclosed herein. The cutting inserts 11 are securely mounted to a cutting tool holder 12 of the first cutting tool 10. It should be noted that the cutting inserts 11 according to the subject matter disclosed herein can be used in any type of cutting operation.

[0059] In some embodiments, the cutting blade 11 is disposed on a substrate or blade holder 13, which is located between the cutting blade 11 and the opening seat surface 14 of the cutting tool holder 12, within the blade space 50 formed at the first holder end 51 of the cutting tool holder 12. In some embodiments, the opening seat surface 14 is angled relative to the bottom surface 46 of the cutting tool holder 12. It should be understood that features described herein with reference to the accompanying drawings and / or illustrated in the drawings and / or recited in the appended claims as constituent elements of the blade holder 13 may be disposed on the cutting tool holder 12, and vice versa, and should not be construed as limiting.

[0060] In some embodiments, the first cutting tool 10 further includes a clamping device 15 attached to the cutting tool holder 12 by a fastener 16. The clamping device 15 and the fastener 16 together securely attach the cutting insert 11 to the first cutting tool 10. In some embodiments, the fastener 16 may be threaded and received in a threaded hole 48, such as... Figure 9The image is generally depicted and referenced in the figure. In some embodiments, the cutting insert 11 is mounted on top of the insert holder 13 to the cutting tool holder 12. In some embodiments, the clamping device 15 has a leading tip 17 configured to be received in a mounting hole 18 formed in the cutting insert 11. The mounting hole 18 may be configured such that a portion of the clamping device 15 can be received therein, while applying force to at least one of the sidewalls and / or bottom of the mounting hole 18 to securely attach the cutting insert 11 to the cutting tool holder 12. The clamping device 15 is also connected to the cutting tool holder via a fastener 16 and a spring pin 49. In some embodiments, the fastener 16 and the spring pin 49 are received in holes 48 and 47 formed in the cutting tool holder 12, respectively.

[0061] It should be noted that the first cutting tool 10 provides a cooling supply arrangement that cooperates with at least one cooling channel 31 provided by the cutting insert 11 to cool the corner cutting area 28 of the cutting insert 11. In some embodiments, the cutting insert 11 may include opposing cooling channels 31 for each corner cutting area 28. For the purposes of these specifications, the first cooling channel 31 and the first corner cutting area 28 are discussed in detail, and their details can be further referred to with reference to similar features of the cutting insert 11, as further specified as needed after the discussion of the cooling channel 31 and the corner cutting area 28.

[0062] Returning to the cooling supply layout structure based on the topic disclosed in this article, the reader is guided to... Figure 9 Further reference Figure 9 The reader will then consider the overall cooling supply arrangement there. The cooling supply arrangement includes a conduit 19 that extends along the length of the cutting tool holder 12 or extends through the length of the cutting tool holder, and has a coolant discharge port 20 at an opening seat surface 14 at a first holder end 51. The first cutting tool 10 also provides a coolant inlet 25 at a second holder end 52 of the cutting tool holder 12. In those embodiments that include a blade holder 13, the coolant discharge port 20 is aligned with a through-hole formed in the blade holder 13.

[0063] More specifically, the lower surface 21 of the blade holder 13 facing the tool has a liquid inlet 22, and the upper surface 23 of the blade holder 13 facing the blade has a liquid outlet 24, which is in fluid communication with a coolant inlet 74 located in the upstream section 30 of at least one cooling channel 31. In other words, a through-hole interconnects the liquid inlet 22 and the liquid outlet 24, and the liquid outlet 24 is in fluid communication with the coolant inlet 74 of at least one cooling channel 31. (See reference...) Figure 8The reader will consider the coolant path through the cutting tool holder 12 as indicated by arrow 105. Coolant enters the cutting tool holder 12 at coolant inlet 25 and is conducted via conduit 19 to a coolant discharge port 20 or outlet formed in the opening surface 14. When used with the insert holder 13, the liquid discharge port 20 is in fluid communication with a liquid inlet 22 of the insert holder 13, which is in fluid communication with a liquid outlet 24 of the insert holder 13, at which the liquid discharge port discharges coolant into at least one cooling channel 31 located in the upstream section 30 of the cutting insert 11, which descends adjacent to the corner cutting area 28 of the cutting insert 11, for cooling the corner cutting area.

[0064] At the heart of the practice of the subject matter disclosed herein is a cutting insert 11. The cutting insert 11 according to the subject matter disclosed herein includes a body 70 having an upper insert surface 35 defining an upper insert plane 109, a lower insert surface 36 defining a lower insert plane 108, and at least one sidewall 71 extending between the upper and lower insert surfaces. In some embodiments, the cutting insert 11 includes opposing sidewalls 71 extending opposite to the front insert plane 110, such as… Figure 14 The image is generally depicted and referenced in the figure. In some embodiments, each sidewall 71 includes two sidewall portions 73 that are angled relative to each other around the central blade plane 100. Thus, in some embodiments, the cutting blade 11 includes two sidewalls 71 and four sidewall portions 73. In some embodiments, the body 70 of the cutting blade 11 is rhomboid or square, having a series of sidewall surfaces 37 extending between the upper blade surface 35 and the lower blade surface 36. In some embodiments, the cutting blade 11 also includes at least one corner cutting region 28 defined between at least one sidewall 71 and the upper blade surface 35.

[0065] In some embodiments, at least one sidewall 71 is formed with at least one cooling channel 31, which defines a coolant flow path 101 extending between its upstream sections 30 and has a coolant inlet 74 facing the lower blade plane 108. The cooling channel 31 also includes a downstream section 72 extending below the corner cutting region 28. In some embodiments, the coolant flow path 101 is at least partially exposed to the exterior 111 of the cutting blade 11, such as... Figure 12 , Figure 14 and Figure 15 Referenced in the text. The coolant passage 31 also includes an arcuate portion 32 located between the upstream section 30 and the downstream section 72. The coolant flow path 101 follows through... Figure 18 The imaginary center line 112 of the coolant flow path 101, depicted as a dashed line, characterizes the coolant flow path. In some embodiments, the coolant flow path 101 is as follows: Figure 13 , Figure 17 and Figure 20 The roughly depicted arc-shaped path.

[0066] In some embodiments, the arcuate portion 32 is characterized by forming a single smooth curve along at least a portion of the coolant flow path 101, which extends within a flow plane defined by the X-axis 113 and the Y-axis 114, such as... Figure 17 Referenced in [the text]. Comparatively referenced. Figure 18 The reader will see that the coolant flow path 101 is linear along an imaginary centerline 112 within the flow plane, as defined by the X-axis 113 and Y-axis extending into the page. Figure 18 Further reference is made to the Z-axis 115 extending transversely to the sidewall 71 and sidewall portion 73 to aid the reader's understanding. In some embodiments, the shape of the arcuate portion 32 generates pressure in the coolant along which it is guided due to centrifugal force 120 directed radially outward from the coolant flow path 101, thereby increasing the coolant flow along the coolant flow path 101 to enhance the strength at the corner cutting region 28 in the downstream section 72.

[0067] In some embodiments, the single smooth curve defined by the arcuate portion 32 is rounded in at least three dimensions along a portion thereof. In this respect, the reader is further guided to... Figure 17 and 18 For example, refer to Figure 17 The reader will see that the radius of the coolant flow path 101 at the upstream section 30 is maximized or virtually infinite, such that no centrifugal force 120 occurs at the upstream section 30. In other words, the coolant flow path 101 is more linear at the upstream section 30. As the coolant flow path 101 advances towards the downstream section 72, the radius of the arcuate portion 32 decreases smoothly corresponding to the progressively increasing centrifugal force 120. Thus, in some embodiments, a single smooth curve has a decreasing radius at least along a portion of the coolant flow path 101 extending from the upstream section 30 towards the downstream section 72, the decreasing radius corresponding to the progressively increasing centrifugal force 120 along said portion of the coolant flow path 101.

[0068] Comparative reference Figure 18 The reader will further consider the upstream segment 30 and the coolant flow path 101 from it. In some embodiments, a single smooth curve has a radius that increases from the upstream segment 30 toward the downstream segment 72 in a dimension transverse to the coolant flow path 101. More specifically, Figure 18An inlet radius 116 is depicted at the coolant inlet 74. The arcuate portion 32 also includes at least a first rounded portion 75 and at least a second rounded portion 76 downstream of the first rounded portion 75 along the length of the arcuate portion 32. The first rounded portion 75 has a radius 117 greater than the inlet radius 116, and the second rounded portion 76 has a radius 118 greater than the radius 117. The radii 116, 117, and 118 increase incrementally as the inclined inner wall surface 77 of the outer wall portion 54 extends along the wall length 125. In other words, the inclined inner wall surface 77 is angled to the inner cavity surface 39 of the wall cavity 79 in which the cooling channel 31 is formed. In some embodiments, the inner cavity surface 39 is parallel to the outer sidewall surface 37 of the sidewall 71.

[0069] return Figure 17 In some embodiments, the reader will see that the arcuate portion 32 extends along the coolant flow path 100 through an arc length of at least 90 degrees relative to the lower blade surface 36 and the lower blade plane 108. In some embodiments, the arcuate portion 32 extends from the lower blade plane 108 along the coolant flow path 100 through an arc length greater than 90 degrees. In some embodiments, the arcuate portion 32 extends from the lower blade plane 108 through an arc length ranging from 105 degrees to 125 degrees. Thus, in some embodiments, the arcuate portion 32 is configured to guide coolant downward along the coolant flow path 101 relative to the upper blade plane 109 at the corner cutting region 28, such as at 119, to enhance heat removal at the corner cutting region 28 and to guide coolant downward into the workpiece 26 during the cutting operation, as described in more detail below.

[0070] As described above, it should be understood that the cooling channel 31 is formed within a wall cavity 79 exposed to the exterior 111 of the cutting blade 11 and has an arcuate portion 32. The arcuate portion 32 guides the coolant along a coolant flow path 101 that follows a centerline 112. In some embodiments, the coolant flow path 101 is an arcuate path formed within the cooling channel 31 in the wall cavity 79. In other words, in some embodiments, the cooling channel 31, which is in fluid communication with the liquid outlet 24, is curved or arcuate in its upper portion, such that the coolant is subjected to a centrifugal force 120 against the arcuate portion 32 to bring as much coolant volume as possible as close as possible to the cutting edge 27 at the corner cutting region 28. The cooling channel 31 is substantially configured to extend between the upstream sections 30 of the cutting blade 11 toward the downstream section 72 at the corner cutting region 28.

[0071] The cutting insert 11 according to the subject matter disclosed herein includes at least one cutting edge 27 associated with a corner cutting region 28 of the cutting insert 11. Each cutting edge 27 is formed between a rake face 57 and a flank face 58, the rake face typically being the upper cutting face of the cutting insert 11, and the flank face typically being the upper portion of the sidewall surface 37' of the sidewall 71 of the cutting insert 11, such as... Figures 16 to 20 Generally and comparatively, in some embodiments, the wall cavity 79 is associated with and formed below the corner cutting region 28 within a sidewall surface 37 defined inwardly by the inner cavity surface 39 relative to the outer surface 111. The externally exposed wall cavity 79 is configured to draw heat from the cutting corner 28 during the cutting operation of the workpiece 26.

[0072] In other words, the corner cutting area 28 has at least one rake face 57 at the upper insert surface 35 and at least one flank face 58 at the sidewall surface 37', thereby providing at least one cutting edge 27. In some embodiments, a cooling channel 31 extends from the flank face 58 to the lower insert surface 36. In some embodiments, such as Figures 22 to 26 The externally exposed cavity 79, generally depicted and referenced, is configured to allow coolant to be introduced into it during cutting operations performed on the workpiece 26. During such cutting operations, the corner cutting area 28 is continuously heated to a high temperature due to the high friction between itself and the workpiece 26. The coolant is intended to flow into the cavity 79 through the cooling channel 31, thereby absorbing and removing the heat transferred to it from the corner cutting area 28. Thus, the corner cutting area 28 is effectively cooled during cutting operations, and wear due to its operation is reduced.

[0073] The cavity 79 is positioned between the corner cutting region 28 and the upper seat surface 23 of the insert holder 13 to allow the coolant to effectively extract heat from the corner cutting region 28. To enable efficient heat extraction from the cutting edge 27 and the corner cutting region 28, at least a portion of the cavity 79 is positioned adjacent to, but spaced from, the corner cutting region 28 to minimize structural damage to the cutting edge 27 and maintain its structural integrity. A cooling channel 31 formed in the cavity 79 is configured to receive coolant at the liquid outlet 24 of the insert holder 13 in the upstream section 30 for removing heat from the corner cutting region 28, the cutting edge 27, and particularly from the structure of the cutting insert 11 positioned between the cutting edge 27 and the cavity 79.

[0074] In some embodiments, a large portion of the coolant flow path 101 is exposed to the exterior 111 of the cutting blade 11. In this respect, the coolant inlet 74 at the upstream section 30 includes or is partially defined by an outer wall portion 54. Therefore, in some embodiments, the upstream section 30 may include an outer wall portion 54 that defines the liquid inlet 74 and is located on the side of the liquid outlet 24 for guiding coolant from the liquid outlet 24 to the cooling channel 31. In some embodiments, the upstream section 30 at the outer wall portion 54 is connected to the inner cavity surface 39 at a rounded portion 55.

[0075] In some embodiments, the rounded portion 55 may be configured to correspond to the outlet diameter 107 of the liquid outlet 24. In other words, in some embodiments, the liquid inlet 74 has an inlet diameter corresponding to the outlet diameter. In some embodiments, the outer wall portion 54 slopes toward the arcuate portion 32, thereby forming a smooth transition with the arcuate portion at the smooth transition point 56 between the upstream section 30 and the downstream section 72 at the corner cutting region 28. In some embodiments, the downstream section 72 extends from the arcuate portion 32 toward the slope portion 40. To reiterate, the arcuate portion 32 is designed to centrifugally apply coolant against it, thereby increasing the coolant flow along the coolant flow path 101 at the corner cutting region 28 for removing heat therefrom. The slope portion 40, as indicated by arrow 121, redirects the coolant toward the workpiece 26 for absorbing heat from the workpiece.

[0076] In some embodiments, a large portion of the coolant flow path 101 is exposed towards the downstream section 72, while the remainder or a small portion of the coolant flow path 101 is unexposed or closed at or near the upstream section 30. In some embodiments, the upstream section 30 may include an outer wall portion 54 located on the side of the outer portion of the coolant inlet 74 for guiding coolant from the coolant outlet 24 into the cooling channel 31. In some embodiments, the outer wall portion 54 is progressively sloped towards a smooth transition point 26, such that a large portion of the coolant flow path 101 is exposed to the exterior 111 of the cutting blade 11. In other words, in some embodiments, the coolant flow path 101 at the upstream section 30 is unexposed or closed as included at the inner wall surface 77 of the outer wall portion 54, which slopes towards the smooth transition point 56. The coolant flow path 101 may be said to include both exposed and closed portions along the coolant flow path 101, which together form a combined exposed / closed coolant flow along it. In some embodiments, the coolant flow path 101 becomes increasingly exposed from the upstream section 30 toward the downstream section 72.

[0077] In some embodiments, the coolant inlet 74 includes an inlet radius such as radius 116. In some embodiments, the outer wall portion 54 is angled or inclined relative to the inner cavity surface 39 of the wall cavity 79 to increase the coolant flow path width 123 relative to the inlet radius 116 as the coolant is guided along the coolant flow path 101 toward the downstream section 72. In some embodiments, the upstream section 30 at the outer wall portion 54 is rounded or sized corresponding to the diameter 107 of the coolant outlet 24 outside the cutting blade 11 and is in fluid communication with it. In some embodiments, the outer wall portion 54 is inclined toward the arcuate portion 32, thereby forming a smooth transition with the arcuate portion at the smooth transition point 56 between the upstream section 30 and the downstream section 72 at the corner cutting region 28.

[0078] In some embodiments, the coolant flow path 101 may be further guided or influenced by an arcuate slope portion 53 extending along the arcuate portion 32. In some embodiments, the arcuate slope portion 53 slopes from the arcuate portion 32 toward the inner cavity surface 39 of the wall cavity 79 to facilitate, for example... Figure 17 The coolant is guided along its path as indicated by arrow 122. The bow-shaped portion 32 terminates at the downstream section 72 at the intermediate blade plane 100 at the ramp portion 40. In some embodiments, the ramp portion 40 is centrally located at the intermediate plane 100, which further guides the coolant flow toward the workpiece 26 and the wall cavity 79 as indicated by arrow 121. In some embodiments, the cooling channel 31 is configured to cooperatively oppose the inner workpiece surface 33 during cutting operations to redirect coolant within the space defined between the inner workpiece surface 33 and the corner cutting area 28.

[0079] In some embodiments, as described above, the cutting insert 11 according to the subject matter disclosed herein may include at least one sidewall 71, the at least one sidewall comprising two sidewall portions 73 angled relative to each other. In some embodiments, the two sidewall portions 73 together define a bifurcated wall cavity 29 below a corner cutting region 28. In other words, the bifurcated wall cavity 29 comprises cavities 79 in fluid communication with each other. In some embodiments, the cutting insert 11 includes a corner cutting region 28 defined between two adjacent sidewall surfaces, a first sidewall surface 37' and a second sidewall surface 37'', and an upper insert surface 35. In some embodiments, at least one cooling channel 31 is formed within the bifurcated wall cavity 29, at least a portion of which is exposed to the insert exterior 111. In some embodiments, opposing cooling channels 31 are formed in the bifurcated wall cavity 29.

[0080] In some embodiments, opposing cooling channels 31 in fluid communication with each other are formed in the bifurcation wall cavity 29. In some embodiments, the bifurcation wall cavity 29 is characterized by two opposing externally exposed cooling channels 31 extending symmetrically about an intermediate blade plane 100, which extends orthogonally to the plane 102 of the cutting blade 11 and intersects diagonally with the lateral half of the intermediate triangle of the cutting blade 11. In some embodiments, the opposing cooling channels 31 together define a bifurcation cooling channel flow path, the opposing portions of which are angled relative to each other and at least in the downstream section 72 toward the corner cutting region 28. In some embodiments, the intermediate blade plane 100 extends orthogonally to the upper blade surface 35 and the lower blade surface 36, and the bifurcation wall cavity 29 is symmetrical about the intermediate blade plane 100. In some embodiments, the opposing cooling channels 31 formed in the bifurcation wall cavity 29 are symmetrical about the intermediate blade plane 100.

[0081] In some embodiments, the upper cutting surface 35 of the cutting insert 11 is generally rhomboid in shape, such as... Figure 14 The cutting blade 11 is generally depicted in the figures. In these embodiments, the cutting blade 11 includes an acute angle 103 at the corner cutting region 28 and a blade corner 45 opposite the corner cutting region 28, wherein there is an obtuse angle 104 at the laterally opposite corner 44 of the cutting blade 11. In some embodiments, the intermediate blade plane 100 extends through the acute angle 103 at the corner cutting region 28 and the blade corner 45. In some embodiments, the cutting blade 11 may have different shapes (e.g., square). In other words, although the illustrated shape of the cutting blade 11 has been depicted as generally rhomboid, the illustrated embodiments are exemplary and should not be construed as limiting.

[0082] In some embodiments, the corner cutting region 28 includes opposing cutting edges 27 angled relative to each other. In some embodiments, the corner cutting region 28 includes a curved cutting edge 59 located between the opposing cutting edges 27. In some embodiments, the corner cutting region 28 includes a tapered portion 60 spaced apart from the curved cutting edge 59 above the corner slope portion 40. Coolant is further directed within the cooling channel 31 such that at least a portion of the internal workpiece surface 33 contains coolant or, as at arrow 106, redirects coolant during cutting operations to facilitate heat removal from the corner cutting region 28, the cutting edges 27, and the workpiece 26.

[0083] Further reference Figures 22 to 26The reader will now consider the workpiece 26 being machined. It should be noted that during the cutting operation, the workpiece 26 itself helps to contain or redirect coolant within the bifurcation cavity 29, as indicated by arrow 106. As the cutting edge 27 removes the chip 34 from the workpiece 26, the internal workpiece surface 33 of the workpiece 26 contains and / or redirects the coolant flowing within the bifurcation cavity 29. Depending on the dimensional characteristics of the workpiece 26, in some applications, the bifurcation cavity 29 may be at least partially open to the outside of the cutting insert 11 to allow coolant to flow through it during the cutting operation, such as... Figures 24 to 26 It is roughly described in Chinese.

[0084] It will be appreciated that, in this disclosure and claims, unless otherwise indicated or clearly stated from the context, direction-related terms (such as top and bottom, upper and lower, up and down, etc.) and similar / related terms are used with reference to the drawings and should not be construed as limiting. The term "horizontal" relative to a surface or line of an element (e.g., a cutting blade) generally means that the surface / line is substantially horizontal when the element in its working orientation is located on a horizontal base, and the term "vertical" relative to a surface / line of an element means that the surface / line is substantially vertical when the element in its normal orientation is located on a horizontal base. The term "front" (and similar terms) refers to the direction toward workpiece 26, and the term "back" (and other similar terms) refers to the direction away from workpiece 26.

[0085] As previously described, the cutting insert 11 according to the subject matter disclosed herein may include an upper insert surface 35, a lower insert surface 36, and a plurality of sidewall surfaces 37 extending between them. In some embodiments, the upper insert surface 35 and the lower insert surface 36 may be horizontally oriented, and the sidewall surfaces 37 may be vertically oriented. The plurality of sidewall surfaces 37 includes a first sidewall surface 37' and a second sidewall surface 37'' adjacent to the first sidewall surface 37'. A corner cutting region 28 is defined between an upper portion of the first sidewall surface 37', an upper portion of the second sidewall surface 37'', and a corner portion of the horizontal upper insert surface 35. A bifurcated cavity 29 is disposed below the corner cutting region 28, with an arcuate upper portion 32 of a relative cooling channel 31 extending below it. In some embodiments, a rake face 57 provided by the horizontal upper insert surface 35 and a flank face 58 provided by the upper portions of the first sidewall surface 37' and the second sidewall surface 37'' may define relative cutting edges 27.

[0086] In some embodiments, at least the corner cutting region 28 may be coated with a first coating material having a reduced thermal conductivity relative to the corner cutting region 28 to provide greater heat resistance at the corner cutting region 28, thereby reducing the impact of heat generated during the cutting process in the corner cutting region 28 and increasing the effective life of the cutting insert 11. In some embodiments, the wall cavity 79 and the bifurcated wall cavity 29 may have a cooling surface defined by the inner cavity surface 39, which may be without the first coating material to achieve the opposite effect, enhancing heat transfer between the coolant flowing within the wall cavity 79 and the bifurcated wall cavity 29 and the corner cutting region 28, i.e., enhancing thermal conductivity, thereby enhancing heat absorption from the corner cutting region 28.

[0087] In some embodiments, the cutting insert 11 may further include a mounting component, such as a mounting hole 18, configured to engage certain fastening elements, such as clamping devices 15 and fasteners 16, through which the cutting insert 11 may be securely held on the cutting tool holder 12 and / or the insert holder 13. The mounting hole 18 may be in the form of a vertical through-hole, and the fastening element may be in the form of a fastener 16 configured to be received therein and inserted into a corresponding fastener receiving hole 48 formed in the cutting tool holder 12. The mounting hole 18 is a centrally located through-hole extending between the horizontal cutting surface 35 and the horizontal lower cutting surface 36 of the cutting insert 11, and has an axis constituting the central axis of the cutting insert 11.

[0088] In some embodiments, the cutting insert 11 is double-sided and has at least a corner cutting region 28 at its leading edge, the corner cutting region being defined at the intersection of one of the horizontal upper insert surface 35 and the horizontal lower insert surface 36 with associated regions of two adjacent sidewall surfaces 37' and 37''. In some embodiments, the cutting insert 11 has at least one cutting edge 27. In some embodiments, the cutting insert 11 may have different configurations and multiple indexable corner cutting regions 28 with cutting edges 27. For example, the cutting insert 11 may have an indexable cutting edge at its upper insert surface 35, or it may have a polygonal shape other than a rhombus (e.g., a square).

[0089] It should be understood that the description of at least one cutting edge 27 and its associated cooling channel 31 should be considered applicable to each of the cutting edges 27 of the cutting insert 11. In other words, in some embodiments, the bifurcated wall cavity 29 may include opposing cooling channels 31, at least a portion of which extends along at least one cutting edge 27 while being spaced apart from the cutting edge 27. In this specification and claims, the term "channel" means a region having at least one coolant guiding wall, at least a portion of which is spaced apart from the remainder of the upper insert surface 35 associated with the cutting edge 27 in a direction toward another lower insert surface 36. The cooling channels 31 according to the subject matter disclosed herein each have an arcuate upper portion 32 that guides coolant along an arcuate coolant flow path 101 within the respective wall cavity 79, functioning in a manner similar to a ramp turn, wherein a substantially flat inner cavity surface 39 extends substantially parallel to the side wall surfaces 37' and 37''.

[0090] As described differently, the corner cutting region 28 is positioned above the relative external cooling channels 31, which together form a bifurcated wall cavity 29, which in some embodiments may be described as a bifurcated cooling cavity 29. Each cooling channel 31 has an upstream section 30 positioned above a liquid outlet 24 to provide fluid communication between the upstream section and the liquid outlet. The bifurcated cooling cavity or wall cavity 29 includes a central corner ramp portion 40, a relative arcuate portion 32, and a relative inner cavity surface 39. Each cooling channel 31 includes a downstream section 72 extending toward the corner cutting region 28 away from the upstream section 30 and positioned along the cutting edge 27 in a spaced-apart relationship.

[0091] In some embodiments, the blade holder 13 may include two through-holes for introducing coolant at a similar upstream section 30 positioned above the liquid outlet 24 to guide the coolant toward the central slope portion 40 along the arcuate portion 32 and the inner cavity surface 39. The cooling channel 31, particularly its geometry and orientation relative to the upstream section 30, may be configured such that coolant can flow directionally along the inner surface of the cooling channel 31 at a desired rate to provide a sufficient amount of surface area exposed to the coolant and to reduce the amount of fluid escaping from the cooling channel 31 according to the size of the workpiece 26. The inner workpiece surface 33 of the workpiece facilitates the reception of coolant flow within the bifurcated cooling cavity 29 and / or, as at arrow 106, when one or more cutting edges 27 remove chips 34 from the workpiece 26. In some embodiments, the corner cutting region 28 may also include a curved cutting edge 59 located between opposing cutting edges 27. In some embodiments, the corner cutting region 28 may include a tapered portion 60 spaced apart from the curved cutting edge 59 above the corner slope portion.

[0092] If the insert holder 13 is used to mount a cutting insert 11 to a cutting tool holder 12, such an insert holder 13 may have an insert-facing surface 23, a tool-facing surface 21, and a base sidewall 41 extending between the two, on which the corresponding cutting insert 11 can be mounted. The insert-facing surface 23 may be formed correspondingly to the lower insert surface 36 and the sidewall surface 37 of the corresponding cutting insert 11. The insert-facing surface 23 may have at least one liquid outlet 24 formed therein, which is configured to provide fluid communication with an upstream section 30 of at least one cooling passage 31. In some embodiments, the insert-facing surface 23 may have at least two liquid outlets 24 formed therein, which are configured to provide fluid communication with an upstream section 30 of an opposing cooling passage 31 formed within a bifurcated cooling cavity or wall cavity 29. In these embodiments, corresponding through-holes may be formed in each such insert holder 13 to allow a conduit 19 to communicate with the liquid outlet 24.

[0093] refer to Figures 27 to 35 The reader will consider a second cutting or milling tool 200 according to the subject matter disclosed herein. The milling tool 200 includes an array of cutting inserts 11 arranged around the periphery of the milling tool at a cutting end 201. In some embodiments, coolant can be guided into the milling tool 200 through a tool end 211 opposite the cutting end 201. The coolant then exits the milling tool 200 via the cutting inserts 11 at the cutting end 201, substantially as previously described. In some embodiments, the milling tool 200 can be rotated about a tool rotation axis 202 as indicated by arrow 204, such that the cutting inserts 11 can cut into a millable surface 203 for milling the millable surface. In some applications, the cutting inserts 11 are adapted to be formed and used as positive cutting inserts 11, wherein a single surface-facing cooling channel 31' of each cutting insert 11 is operable to cool the cutting corner region 28 of each cutting insert as each cutting insert 11 rotates 204 about the tool rotation axis 202 into the millable surface 203.

[0094] refer to Figure 30 The reader will consider more specifically the tool end 211 of the milling tool 200. In some embodiments, a coolant inlet 205 is formed at or near the tool end 211 in the main tool body 206 of the milling tool 200. Coolant can be directed into the coolant inlet 205 and directed toward the cutting end 201 via a conduit passage 207 formed in the main tool body 206 toward a coolant outlet 208 formed in a blade support portion 209 constructed around the periphery of the milling tool 200 at the cutting end 201. For example, refer to... Figure 34 The reader will consider a substantially flat blade support portion 209 configured to support the lower blade surface 36 of the cutting blade, wherein a single coolant outlet 208 is formed.

[0095] In some embodiments, the cutting insert 11 is mounted to the insert support portion 209 such that the coolant inlet 74 at the upstream section 30 of the surface-facing cooling channel 31' is aligned with the coolant outlet 208 of the insert support portion 209. In some embodiments, the insert support portion 209 further includes a fastener receiving hole 210 that mates with a mounting hole 18 formed in the cutting insert 11. Fasteners 212 securely fasten the respective cutting insert 11 to the respective insert support portion 209 via the coaxially aligned fastener receiving hole 210 and mounting hole 18.

[0096] In other words, in some embodiments, each cutting insert 11 that can be mounted to the milling tool 200 is adapted to be formed and used as a positive cutting insert having a single cutting edge 27 at a corner cutting region 28 opposite to the millable surface 203. The array of cutting inserts 11 of the milling tool 200 is arranged and configured such that coolant can be guided into a surface-facing cooling channel 31' facing the millable surface 203 of the milling tool 200, which generally extends laterally relative to the tool rotation axis 202. Coolant enters the surface-facing cooling channel 31' at the upstream section 30 of the cutting insert 11 and is guided along the coolant flow path 101 toward the corner cutting region 28 of the cutting insert 11 for cooling the corner cutting region 28 when the milling tool 200 mills or cuts the millable surface 203.

[0097] In some embodiments, the outward-facing cooling channel 31'', which faces outward 111 and extends substantially parallel to the tool rotation axis 202, is not necessarily configured to guide coolant therein to direct coolant toward the central corner cutting region 28. In other words, in some applications, the outward-facing cooling channel 31'' is not configured to include a coolant inlet aligned with a coolant outlet formed in the insert support portion 209 of the milling tool 200. That is, the bifurcated wall cavity 29 adjacent to the corner cutting region 28 can still allow coolant to enter the space defined by both the surface-facing cooling channel 31' and the outward-facing cooling channel 31'', thereby facilitating heat transfer from the corner cutting region 28. In some embodiments, the cutting insert 11 of the milling tool 200 is further configured to operate substantially as described above.

Claims

1. A cutting insert comprising a body having an upper insert surface, a lower insert surface defining a lower insert plane, and at least one sidewall extending between the upper insert surface and the lower insert surface, and the cutting insert including at least one corner cutting region defined between the at least one sidewall and the upper insert surface; The at least one sidewall is formed with at least one cooling channel defining a coolant flow path that extends between an upstream section and a downstream section of the coolant flow path. The upstream section has a coolant inlet facing the lower blade plane, and the downstream section extends below the at least one corner cutting area. The coolant flow path is at least partially exposed to the outside of the cutting blade and includes an arcuate portion located between the upstream and downstream sections.

2. The cutting insert according to claim 1, wherein, The bow-shaped portion is characterized by having at least a single smooth curve along at least a portion of the coolant flow path.

3. The cutting insert according to claim 2, wherein, The single smooth curve extends along a plane dimension parallel to the sidewall.

4. The cutting insert according to any one of the preceding claims, wherein, The bow-shaped portion generates pressure in the coolant guided along the bow-shaped portion, thereby increasing the coolant flow along the coolant flow path to increase heat removal at the corner cutting area.

5. The cutting insert according to any one of the preceding claims, wherein, The bow-shaped portion is rounded in at least three dimensions along a portion of the bow-shaped portion.

6. The cutting insert according to claim 5 when claim 4 is referenced, wherein, The arc-shaped portion has a reduced radius at least along a portion of the coolant flow path extending from the upstream section toward the downstream section, the reduced radius corresponding to an increased centrifugal force along that portion of the coolant flow path.

7. The cutting insert according to any one of claims 5 or 6 when claim 4 is referenced, wherein, The arc-shaped portion has a radius that increases from the upstream section toward the downstream section in a dimension transverse to the coolant flow path.

8. The cutting insert according to any one of the preceding claims, wherein, The arc-shaped portion extends along the coolant flow path through an arc length of at least 90 degrees.

9. The cutting insert according to any one of the preceding claims, wherein, The arc-shaped portion extends along the coolant flow path through an arc length greater than 90 degrees.

10. The cutting insert according to any one of the preceding claims, wherein, The arc-shaped portion extends through an arc length ranging from 105 degrees to 125 degrees.

11. The cutting insert according to any one of the preceding claims, wherein, The bow-shaped portion is configured to guide the coolant downward along the coolant flow path at the corner cutting area to enhance heat removal at the corner cutting area.

12. The cutting insert according to any one of the preceding claims, wherein, The cooling channel is formed in the wall cavity, at least a portion of which is exposed to the outside of the cutting blade.

13. The cutting insert according to claim 12, wherein, Most of the coolant flow path is exposed to the outside of the cutting blade.

14. The cutting insert according to claim 13, wherein, Most of the coolant flow path is exposed towards the downstream section, and a small portion of the coolant flow path is closed towards the upstream section.

15. The cutting insert according to claim 14, wherein, The coolant flow path in the upstream section is closed relative to the outside, and the coolant flow path thus includes an exposed portion and a closed portion along the coolant flow path, the exposed portion and the closed portion together forming a combined coolant flow.

16. The cutting insert according to any one of claims 12 to 15, wherein, The coolant flow path becomes increasingly exposed from the upstream section toward the downstream section.

17. The cutting insert according to any one of claims 12 to 16, wherein, The outer wall portion seals the coolant inlet in the upstream section.

18. The cutting insert according to claim 17, wherein, The outer wall portion is inclined toward the bow-shaped portion, thereby forming a smooth transition with the bow-shaped portion at a smooth transition point between the upstream section and the downstream section.

19. The cutting insert according to any one of claims 17 or 18, wherein, The coolant inlet has an inlet radius, and the outer wall portion is inclined relative to the coolant inlet to increase the width of the coolant flow path relative to the inlet radius as the coolant is guided toward the downstream section along the coolant flow path.

20. The cutting insert according to any one of claims 12 to 19, comprising an arcuate bevel portion extending along the arcuate portion and inclined from the arcuate portion toward the inner cavity surface of the wall cavity for guiding coolant along the inner cavity surface.

21. The cutting insert according to claim 20, wherein, The inner cavity surface is parallel to the coolant flow path.

22. The cutting insert according to any one of claim 20 or 21, wherein, The inner cavity surface extends in parallel with the sidewall surface of the sidewall.

23. The cutting insert according to any one of the preceding claims, wherein, The coolant inlet has an inlet diameter configured to receive coolant from a coolant outlet in fluid communication with the coolant inlet.

24. The cutting insert according to claim 23, wherein, The coolant outlet has an outlet diameter corresponding to the inlet diameter.

25. The cutting insert according to any one of the preceding claims, wherein, The corner cutting area includes a corner slope portion that is configured to redirect coolant below the corner cutting area.

26. The cutting insert according to any one of the preceding claims, wherein, The sidewalls include opposing sidewall portions that are angled relative to each other.

27. The cutting insert according to claim 26, wherein, The opposing sidewall portions together define a bifurcated wall cavity below the corner cutting area.

28. The cutting insert according to claim 27, wherein, The bifurcated wall cavity includes opposing cooling channels that are in fluid communication with each other.

29. The cutting insert according to claim 28, wherein, The relative cooling channels together define the flow paths of the bifurcated cooling channels, the relative portions of which are angled relative to each other and toward the corner cutting area.

30. The cutting insert according to any one of claims 27 to 29, wherein, The intermediate blade plane extends orthogonally relative to the upper blade surface and the lower blade surface, and the bifurcated wall cavity is symmetrical about the intermediate blade plane.

31. The cutting insert according to any one of claims 28 to 30 when claim 27 is referenced, wherein, The relative cooling channels formed in the bifurcated wall cavity are symmetrical about the plane of the intermediate blade.

32. The cutting insert according to any one of the preceding claims, wherein, The corner cutting area includes a rake face located on the surface of the upper blade and a flank face located on the surface of the sidewall, thereby providing at least one cutting edge on the surface of the upper blade.

33. The cutting insert according to claim 32, wherein, At least one cooling channel extends from the flank face to the lower blade surface.

34. The cutting insert according to any one of claims 32 or 33, wherein, The corner cutting area includes opposing cutting edges that are angled relative to each other.

35. The cutting insert according to claim 34, wherein, The corner cutting area includes a curved cutting edge located between the opposing cutting edges.

36. The cutting insert according to claim 35, wherein, The corner cutting area includes a tapered portion above the corner slope portion that is spaced apart from the curved cutting edge.

37. The cutting insert according to any one of the preceding claims, wherein, The main body is rhomboid in shape, has an acute angle at the corner cutting area, and has a blade corner opposite to the corner cutting area.

38. The cutting insert according to any one of the preceding claims, wherein, The cooling channel is configured to be opposite the workpiece during the cutting operation.

39. The cutting insert according to claim 38, wherein, The workpiece includes an inner workpiece surface, and the cooling channel and the inner workpiece surface are configured together to redirect coolant within a space defined between the cooling channel and the inner workpiece surface.

Images