DRILLING SYSTEMS WITH COOLANT DISTRIBUTION ARRANGEMENTS AND METHODS

Abstract

A drilling tool assembly is provided for drilling metallic or other materials, comprising a holder having a mounting slot in which a cutting insert is placed and a coolant delivery system through the tool. The drilling tool system allows coolant to be applied to the rake surfaces of the cutting insert in a manner that facilitates higher penetration rates while maintaining the integrity of the cutting edges of the cutting insert. The drilling tool system comprises a holder having a rotation axis and a mounting slot. A cutting insert with sides positioned adjacent to the lateral surfaces of the mounting slot and cutting edges extending from the rotation axis is mounted in the slot. The insert includes rake surfaces adjacent to the cutting edges that are positioned above the mounting slot.At least one coolant channel is provided with at least one coolant outlet directed to the sides of the insert in a position below the rake surfaces. The coolant outlet is configured to disperse coolant in a spray across the entire rake face of each cutting edge.

Description

DRILLING SYSTEMS WITH COOLANT DISTRIBUTION ARRANGEMENTS AND METHODS Cross-reference with related application This application claims priority and the benefit of U.S. patent application Serial No. 16 / 850,684 filed on April 16, 2020 and is incorporated herein by reference in its entirety. Technical Field The present invention relates to a drilling tool assembly for drilling metallic or other materials, comprising a holder having a mounting groove in which a cutting insert is placed and a coolant delivery system through the tool. More specifically, this invention relates to a drilling tool system that allows coolant to be applied to the rake face or inclined face (the face or surface through which the chips flow) of the cutting insert in a manner that facilitates higher penetration rates while maintaining the integrity of the cutting edges of the cutting insert. Background of the Invention In the metal cutting industry, the use of coolant is highly desirable for improved tool performance. Coolant provides lubrication, dissipates heat from the tool, and aids in chip evacuation. This results in a tool that can operate faster and achieve a longer tool life. Although coolant use in drilling products for various industries is common, there is still a need in the drilling tool industry for a coolant delivery method that excels at targeting the chip interface and the rake face of the cutting geometry, particularly in drills with two effective cutting edges. Coolant delivery in such tools has not yet allowed for higher penetration rates in drilling operations without sacrificing tool life.Achieving this is even more critical because the properties of many materials drilled today generate undesirable heat, friction, and adhesion to the scrap face of these types of drill tools, negatively impacting drilling performance. These undesirable effects are amplified by the increasing desire to drill wells faster in high-production environments. Therefore, there is a clear need for coolant delivery in a way that excels at reducing heat, friction, and adhesion on the scrap face during drilling operations, enabling improved performance at high speeds compared to similar drill designs. Brief Description of the Invention Therefore, the invention relates to a drilling tool that achieves the beneficial effects of minimizing undesirable heat, friction, and adhesion to the rake face of drilling tools of this type. The drilling tool system comprises a holder having a rotation axis and first and second clamping arms with lateral surfaces forming a mounting groove. A cutting insert with sides positioned adjacent to the lateral surfaces of the mounting groove and cutting edges extending from the rotation axis is mounted in the groove. The insert includes rake surfaces adjacent to the cutting edges that are positioned above the first and second clamping arms when the insert is mounted in the mounting groove.At least one coolant channel is arranged through the first and second clamping arms with at least one coolant outlet directed to the sides of the insert in a position below the peel surfaces. The coolant outlet is configured to disperse coolant in a spray across the entire peel face of each cutting edge. A drilling tool assembly according to one example includes a holder having first and second ends and a rotation axis. The second end of the holder is configured for fixed mounting in a drilling machine, and the first end comprises a support groove having a lower seating surface over at least a portion of the support groove. At least one cutting insert is provided having first and second sides, with the first side positioned in the support groove in seating engagement with the lower seating surface of the holder, such that the insert has a common rotation axis with the holder. The second side of the insert includes double effective first and second cutting edges extending from the rotation axis and first and second rake faces adjacent to the cutting edges.The holder also includes at least first and second cooling holes that extend through the holder and direct a quantity of coolant over the first and second peel faces at a predetermined location and a volume of coolant that is distributed over the first and second peel faces substantially over the entire portion of the peel face adjacent to each cutting edge. In one example, the drilling tool assembly comprises at least first and second cooling holes extending through the holder and having an outlet opening at least partially in the holder slot and angled to direct a quantity of coolant onto the first and second peel faces at a predetermined location adjacent to the holder slot and at an angle to the peel face. In another example, the drilling tool assembly comprises at least first and second cooling holes extending through the holder and having an outlet opening in the holder slot and at least one reservoir adjacent to the peel face, directing a quantity of coolant to the first and second peel faces at a predetermined location from the at least one reservoir. The invention also provides a method for supplying coolant in a drilling operation using a drilling tool comprising a holder having first and second ends and a rotation axis.The second end of the holder is configured to be fixed to a drilling machine, and the first end of the holder comprises a mounting groove with side surfaces and a cutting insert positioned in the mounting groove with side surfaces positioned adjacent to the side surfaces of the mounting groove, wherein the insert includes first and second effective double cutting edges extending from the axis of rotation and first and second rake faces adjacent to the cutting edges and above the mounting groove of the holder, and wherein the holder further includes at least first and second coolant outlets positioned adjacent to the sides of the insert and directing a quantity of coolant under pressure onto the side surfaces of the insert to cause the coolant to disperse in a curtain over substantially the entire portion of the rake face adjacent to each edge.The coolant delivery system provides a constant, directed atomization of coolant across the rake face of the cutting geometry, particularly across the rake face of a double-acting cutting edge arrangement. Typical drilling designs do not target this critical cutting zone with directed coolant and instead rely on a flooding effect of coolant to attempt to reach this area. Furthermore, the coolant delivery system in the drilling tool of the invention aids in chip segmentation by thermal shock of the chip on the rake face provided by the directed coolant. The directed coolant also improves the lubricity and flow of the coolant around the cutting area, minimizing chip shear and promoting superior chip evacuation from the drilled hole.It is also important to note that this coolant delivery system and method can be used in conjunction with additional coolant outlets directed to other critical areas of the cutting action within the same drill body. Such additional coolant supply may depend on various factors, including the application and material. Accordingly, this invention provides an improved drilling tool assembly and method to allow the minimization of undesirable heat, friction, and adhesion to the material's peel face during a drilling operation, resulting in the ability to operate the drilling tool at higher speeds while providing exceptional tool life. The above improvements and advantages, together with other objects and advantages of the present invention, will become readily apparent from reading the detailed description of several examples taken in conjunction with the drawings and the claims. Brief Description of the Drawings The invention and its features are described in more detail below by way of examples with reference to the drawings, in which: Figure 1 is a view of the body of the drilling tool holder in an example. Figure 2 is a partial perspective view of the support shown in Figure 1. Figure 3 is a view of the cutting insert for mounting in the holder of Figure 1 in the tool assembly of MA / t / áUZJ / UI drilling. Figure 4 is a partial cross-sectional view of the support shown in Figure 1. Figure 5 is a partial cross-sectional view of the support shown in Figure 1, with the insert of Figure 2 mounted in association with the support. Figure 6 is a partial perspective view of an alternative example of tool holders in the drilling tool assembly of the invention. Figure 7 is a partial perspective view of the support in Figure 6, with the insert in Figure 2 mounted in association with the support. Figure 8 is a partial cross-sectional view of the support shown in Figure 6, with the insert of Figure 2 mounted in association with the support. Figure 9 is a partial cross-sectional view of the support shown in Figure 6, with the insert of Figure 2 mounted in association with the support. Figure 10 is a partial perspective view of an alternative example of a holder in the drilling tool assembly of the invention. Figure 11 is a view of an alternative example of a cutting insert in the drilling tool assembly of the invention. Figure 12 is a partial cross-sectional view of the support shown in Figure 10, with the insert of Figure 11 mounted in association with the support. Figure 13 is a partial perspective view of an alternative example of a cutting support and insert in the drilling tool assembly of the invention. Figure 14 is a partial perspective view of an alternative example of a holder in the drilling tool assembly of the invention. Figure 15 is a partial perspective view of the example in Figure 14 with a cutting insert mounted in the holder in the drilling tool assembly of the invention. Figure 16 is a partial perspective view of an alternative example of a holder in the drilling tool assembly of the invention. Description of the Invention Returning now to the examples of the invention, it will be noted that the coolant delivery configurations provide distinct advantages in conjunction with the drilling tools used to make holes. Known coolant configurations for drill bits include through-cooled bits, which are designed with coolant exiting through the parting surface of the bit's cutting geometry. This results in the coolant being directed to the bottom of the drilled hole. Other arrangements include coolant outlets that emerge from the flutes of the drill bit and are directed or pointed to the bottom of the well. Such arrangements have a greater potential to disrupt chip flow through the flutes of the bit, and the coolant is directed to the bottom of the well from a distance away from the cutting end of the bit.In the examples of the invention, the coolant delivery arrangement creates a superior coolant path that better targets the entire rake face of the cutting geometry without interrupting chip flow. The examples are directed toward improved coolant delivery systems and methods to enhance drilling performance. Returning to Figures 1-5, a first example of a drilling tool assembly in general, as indicated in 10, is illustrated. The drilling tool assembly 10 comprises a holder 12 having a shank 14 and a head portion 16 associated therewith. The holder 12 is generally cylindrical in shape with a first end 20 and a second end 22, the second end 22 and shank portion 14 being adapted for fixed attachment to a drilling machine for use. As shown in Figure 2, the first end 20 of the holder 12 has a clamping groove or location 30 that can extend through the entire diameter of the head portion 16 or at least over a central portion thereof at the general location of the holder's axis of rotation. 12.The locating groove 30 has a lower wall 32 positioned substantially perpendicular to the rotation axis 18 of the support 12, or this wall 32 may be angled or comprise multiple surfaces. Within the locating groove 30, at least one cutting insert 50 is precisely positioned relative to the support 12 and engages with the wall 32. The cutting insert 50 performs the desired drilling function in conjunction with the support 12 and allows for replacement of the insert 50 when worn. The insert 50 has a double effective cutting geometry with a tip geometry comprising a majority of cutting edges 56 that are precisely positioned relative to the rotation axis of the support 12 to minimize errors in a resulting drilling operation using the assembly 10. The support 12 can be configured to include at its first end 20 a pair of clamping arms 34 and 36 that extend around the locating slot 30. The clamping arms 34 and 36 include openings 38 that accommodate screws to secure the cutting insert 50 in position within the locating slot 30. The holes 38 are threaded and align with screw holes 52 formed in the cutting insert 50 to precisely locate the cutting insert 50 in a predetermined location within the locating slot 30.Each of the clamping arms 34 and 36 also includes first and second coolant supply vent holes for the inclined surface 40, which are positioned to overlap at least partially with the upper edge 44 of the vertical wall 46 of each clamping arm 34 and 36 adjacent to the insert side position 50 below the inclined surface 54 associated with each cutting edge 56 on the cutting insert 50. A cutting flange 55 formed adjacent to the cutting edge 56 provides a geometry capable of producing a wavy metal chip for evacuation. The size and shape of the chip can be controlled by altering the geometry of the cutting flange 55, such as its position, size, and configuration. The inclined surface 54 can be formed to have a flat, concave, or curved surface and forms the rake angle of the rake face 54 on the cutting edges 56, which can be uniform or variable.A notch formed adjacent to the axis of rotation provides a notched cutting edge and a rake surface adjacent to the insert tip. The clamping arms 34 and 36 may also include angled or curved surfaces that facilitate chip removal through chip evacuation grooves 37 on each side of the holder 12, corresponding to one of the cutting edges 56. The lower surface 58 of the cutting insert 50 mates with the seating surface 32 and, although shown to be flat like the surface 32, could have another configuration corresponding to the shape of the lower surface 32. A locating protrusion or pin (not shown) may be inserted into an opening formed in the lower surface 32 of the locating groove 30 in the holder 12, precisely positioned with respect to the axis of rotation of the holder 12.The cutting insert 50 includes a locating groove 60 that engages with the locating protrusion to precisely position the insert 50 relative to the rotation axis of the support 12. The cutting insert 50 may be in the form of a spade drill blade, with the blade's side edges 62 generally parallel to the rotation axis 18 of the holder 12 once the insert 50 is positioned and secured with the holder 12. When secured with the holder 12, the cutting insert 50 will have a rotation axis that is desirably coaxial with the rotation axis of the holder 12. The cutting insert 50 has a width and may include margins 64 on the edges 62 to facilitate machining the hole to the desired finish characteristics. The cutting edges 56 on the cutting insert 50 are obtusely V-shaped, with cutting edges 56 on each side of the axial center. The cutting edges 56 may include a plurality of cutting and chip-breaker sections 66, which cooperate to provide the desired double effective cutting surface for the drilling material and / or application.In general, the insert 50 is designed to cut when driven in rotation in conjunction with the support 12 in a predetermined direction and is not reversible, although those experienced in the art are familiar with such configurations of drill blades and they could be used in conjunction with the present invention, if desired. The mounting openings 52 cooperate with the openings 38 in the clamping arms 34 and 36 to secure the insert 50 within the locating groove 30 and seat against the seating surface 32. The locating groove 60 allows a locating bolt to be inserted therein, and clamping screws (not shown) deflect or tilt the insert 50 and groove 60 against the locating bolt for correct and precise positioning of the insert 50 with respect to the support 12 as desired. Other arrangements for properly positioning the insert 50 with respect to the support are contemplated.In this example, the cutting edges 56 are substantially parallel to the thickness of the insert 50 and are recessed from the thickness of the insert 50 by an amount, such as, for example, from approximately 0.25 millimeters (0.01 inches) to 0.635 millimeters (0.025 inches). The coolant dispersion from the coolant holes 40 allows the coolant to impinge on the fusion interface of the forming chip at and just away from the rake face 54. In this example, the arrangement of the first and second coolant supply vent holes 40 on the rake face allows the application and flow of lubricating coolant directly to the rake face 54 adjacent to the cutting edges 56 of the cutting insert 50. This minimizes unwanted heat, friction, and adhesion to the rake face 54 of machined materials created by the cutting edges 56 in a tool set of this type. This enables higher penetration rates in the drilling operation. The clamping arms 34 and 36 can optionally include additional coolant outlets 48 provided on their upper surfaces to supply extra coolant directed to the bottom of the hole to facilitate chip removal.In the machining operation, the cutting edges 56 deform and cut the material, generating significant heat and producing chips that must be removed from the rake face and ejected from the hole. The first and second rake face coolant supply vent holes 40 deliver a powerful flow of lubricating coolant directly to the insert face 50, separate from the rake face 54 adjacent to the cutting edges 56 of the cutting insert 50. In this way, the coolant flow is dispersed in a curtain configuration that then impinges on the interface between the forming chip and the rake face 54. The metal material, plastically deformed by the cutting edges 54, undergoes mechanical and chemical processes at the melting point of the formed chip, generating heat.The coolant curtain flow provided by the first and second rake face coolant supply vents 40 serves to penetrate the melt barrier more directly by causing coolant flow towards the melt boundary from an offset angle with respect to the rake face and cutting edge interface, dispersed due to the impact on the side surface of the insert 50 below the rake face 54 in 70. The coolant flow from the vents 40 also does not interrupt the flow of chips towards the channels in the holder 12 as they form and are evacuated through the channels or other areas.The position of the vents 40 maintains a substantially uniform flow of coolant to the interface between the rake face and the forming chip, by the coolant flowing in a curtain across the rake face 54 from the offset position adjacent to the center of the insert 50. The dispersion of the incident coolant across the rake face 54 extends to the outer diameter of the cutting edges 56. The distance from the initial impact on the rake face 54 depends on the size of the insert 50, but is generally spaced a distance of approximately 0.5 centimeters (0.2 inches) to 2.5 centimeters (1 inch), in a position above the centerline of the insert 50 height, but can have any appropriate dimension based on the size of the insert 50.The vent holes 40 are angled relative to the sides of the insert 50 at an angle of between 10 and 40 degrees, for example, or any appropriate angle based on the size of the insert 50 to produce the coolant dispersion as shown in Figure 5. For some applications, an angle of between 20 and 30 degrees has been found to be effective. The coolant holes 40 are also angled relative to the axis of rotation of the insert at an angle of between 10 and 40 degrees, for example. This angle is based on the width of the insert 50 to allow the coolant curtain to disperse from the adjacent position near the axis of rotation of the insert 50 and across the entire interface between the rake face and the chip as it forms during machining. For some applications, an angle of between 20 and 30 degrees has been found to be effective.The size and position of the cooling holes 40 at the interface between the clamping arms 34 and 36 and the insert side 50 also allow the desired volume of coolant to be dispersed over the interface of the rake face 54 and the melt boundary of the chip formed at the cutting edges 56. The coolant can be supplied under pressures from 3.45 MPa (500 psi) to 6.9 MPa (1000 psi), for example, but other pressures may be appropriate or preferred depending on the application and materials being machined.Therefore, in operation, the chips formed along the cutting edges 56 from the center and along the rake face are rippled by the cutting flange 55 on the rake face 54 and the chip divider 66, which introduces tension. This tension then impinges on the curtain of coolant supplied by the first and second vent holes 40, shaking the material as it deforms at the cutting edges 56 to aid in chip segmentation. The coolant from the vent holes 40 passes through the insert face and the rake face 54 to impinge on the melt boundary of the chip as it forms, causing thermal shock to the material as the chip forms at the rake surface interface. In this example as well, the configuration of the first and second coolant outlet holes 40, with a portion, such as approximately half the diameter as shown, at the interface of the clamping arms 34 and 36 and the sides of the insert 50, provides the desired coolant dispersion along the entire rake face 54 to the outer diameter. The coolant outlets 40 form a partial coolant hole extending from the groove 30, directing coolant to the rake face and dispersing it across the face alongside the cutting edges 56 where the material chip forms during machining, and directly at the melt boundary of the forming chip.The configuration of the coolant holes 40, in combination with the slot 30 and the interface with the insert's side surface 50, provides partial outlets at the interface. This creates turbulence and fringes of coolant outside the partial hole, resulting in greater coolant dispersion relative to the diameter. This facilitates and creates the desired fan-like dispersion of coolant across the peel face 54. The half-hole configuration in this example causes left and right fringes as the coolant exits the hole, and the reduced flow at the interface creates turbulence at the edges, further enhancing the fringe effect.Although a single coolant outlet 40 provides the desired dispersion of coolant through the peel face 54, additional coolant holes or outlets may be used to cover the peel face if desired, or other configurations of partial outlets 40 may be used instead of half of a circular hole, for example. As will be described with reference to other examples, insert 50 may also have coolant directing structures on the insert face to help direct coolant flow to the rake and chip-forming face. Coolant flow along the rake face 54 also directly reaches the melting limit of the forming chip on the rake face 54. The curtain of coolant supplied to the rake face 54 does not impede chip movement as it forms in the evacuation groove, but rather helps to curl and break the chip as it forms on and exits the rake face.The coolant is directed to this location from the offset location of the flute so that it flows flat across the insert face 50 and the rake face 54, such that the formed chips flow over the top of the coolant flow to enter the flute for effective discharge, even with large depth-to-diameter ratios. This arrangement also provides coolant dispersion to the outer diameter of the rake face 54, while continuing to disperse it in the center of the tool. Returning to Figures 6-9, another example of the drilling system 110 of the invention is shown. In this example, the support 112 can be configured similarly to that described in the previous example, but includes additional structures at its first end 120. The clamping arms 134 and 136 include first and second coolant supply holes in the release surface 140 that open into at least one chamber or cavity 180 formed adjacent to the inner surface 182 of the groove 130. The chamber 180 in this example is configured to have a somewhat triangular shape, with its upper side intersecting the interface between the side surface 182 and the upper surface 184 of the arms 134 and 136, to create a partial opening at the interface. Other suitable shapes of the chamber 180 are contemplated.In this example, the partial opening extends approximately from the center of the clamping arms 134 and 136 at 186 to a position adjacent to the inner edge of the clamping arms 134 and 136 at 188. In this way, the coolant supplied through the first and second coolant supply holes in the peel surface 140 flows into chamber 180 and then disperses from chamber 180 to the top of chamber 180, forming a partial opening adjacent to the side surface of a cutting insert 150 positioned in the groove 130. This allows the application and flow of lubricating coolant directly to the peel face 154 and cutting edge 155 adjacent to the cutting edges 156 of the cutting insert 150.This, again, minimizes undesirable heat, friction, and adhesion to the rake face 154 of the machined materials created by the cutting edges 156, allowing for higher penetration rates. The partial opening formed adjacent to the side surface of a cutting insert 150 created by the chamber 180 may also include barrier structures 190 to prevent the possible entry of material chips into the chamber 180 during machining and / or to facilitate the dispersion of coolant from the chamber 180 to the rake face 154 as desired. The structures 190 may have sloped sides to help direct the coolant flow as desired. Although not shown, additional outlets may be provided on the upper surface of the clamping arms 134 and 136 to provide additional coolant directed to the bottom of the hole if desired.Again in this example, the first and second coolant supply outlets of the rake face 140 deliver a powerful flow of lubricating coolant directly to the face of the insert 150 at a position separate from the rake face 154 adjacent to the cutting edges 156 of the cutting insert 150. In this way, the coolant flow is dispersed in a curtain configuration that then impinges on the interface between the chip of material being formed and the rake face 154. The coolant curtain flow provided by the first and second coolant supply outlets of the rake face 140 in conjunction with the chamber 180 serves to disperse the coolant more directly onto the melt boundary from an offset angle to the rake face and cutting edge interface, as in the previous example.The coolant flow from the partial openings created by chamber 180 does not interrupt the flow of chips to the flutes of the support 112 as they form and are evacuated through the flutes or other areas. The position of the vents 140 and chambers 180 maintains a substantially uniform flow of coolant to the interface between the rake face and the forming chip, creating a coolant curtain across the rake face 154 from the offset position of the flutes. The dispersion of the incident coolant across the rake face 154 extends to the outer diameter of the cutting edges 156. The distance from the initial impact on the rake face 154 depends on the size of the insert 150, but is spaced to allow for the desired coolant dispersion.The outlets 140 are angled with respect to the sides of the insert 150 to produce coolant dispersion as shown in Figure 9. In this example, the coolant holes 140 can be substantially parallel to the insert's axis of rotation, but the chamber 180 then produces coolant dispersion at an angle across the entire interface between the rake face and the chip as it forms during machining. Thus, in operation, as in the previous example, the chips formed along the cutting edges 156 from the center and along the rake face 154 receive thermal shock as the material deforms at the cutting edges 156 to aid in chip segmentation. In another example, as shown in Figures 10-11, the support 212 can be configured similarly to that described in the previous example, but includes additional structures at its first end 220. The clamping arms 234 and 236 include first and second peel-surface coolant supply holes 240 that open onto the inner surface 282 of the groove 230. The outlets 240 lead to a chamber or cavity 280 formed in the side surface of the insert 250 in this example. The chamber 280 is configured to have a somewhat triangular shape, with its upper side opening into the top of the insert 250, intersecting the interface between the side surface 282 and the top surface 284 of the arms 234 and 236, to create a partial opening at the interface. Other suitable forms of the 280 camera are contemplated. In this example, the partial aperture extends approximately from the center. The clamping arms 234 and 236 are extended to a position adjacent to the inner edge of the clamping arms 234 and 236 at point 286. In this way, the coolant supplied through the first and second coolant supply holes of the rake face 240 flows into chamber 280 and then disperses from chamber 280 to the top of chamber 280, forming a partial opening next to the side surface of a cutting insert 250 positioned in the groove 230. This allows the application and flow of lubricating coolant directly to the rake face 254 and the cutting edge 255 adjacent to the cutting edges 256 of the cutting insert 250. This, again, minimizes undesirable heat, friction, and adhesion to the rake face 254 of the machined materials created by the cutting edges. 256, to allow for higher penetration speeds.Coolant flow diversion structures 290 may also be formed adjacent to the partial opening between the side surface of a cutting insert 250 created by the chamber 280, to control the flow and dispersion of coolant along the entire rake face 254. The structures 290 may be upright from the side surface of the insert 250 and taper towards the rake face 254, but other suitable configurations, such as curved elements or grooves, may be used to control coolant flow if desired. In the configuration shown or other suitable configurations of the structures 290, the structures 290 also serve as chip breakers, to facilitate chip formation as the cutting edge 255 and rake face 254 ripple or curl the material.The replaceable cutting tip 250 is responsible for cutting the workpiece material, and the chip breakers create two or more chips formed along the rake face 254, which are further broken or segmented by the chip-breaking structures 290. The chip breakers 290 curl the chip, introducing stress or tension, ultimately aiding in chip segmentation. The coolant delivery system provides a coolant cavity 280, which helps to ventilate and disperse the coolant to strike all the cutting edges of the cutting tip 250. To further assist with coolant distribution and aid chip formation, the structures 290 that serve as additional chip-breaking ridges or protrusions also allow coolant to be directed directly to the chip-breaking zone via the coolant channels 292 formed between the ridges or protrusions 290.While other tools supply coolant parallel to the tool axis, supplying coolant to the cutting tip by flooding the hole created by the tool, the purpose of this and other designs of the invention is to provide the ability to vent the coolant through the face of the insert, carrying it to the entire cutting edge. Although not shown, additional outlets can be provided on the upper surface of the clamping arms 234 and 236 to supply additional coolant directed to the bottom of the hole if desired. Again in this example, the first and second sloped surface coolant supply outlets 240 deliver a powerful flow of lubricating coolant directly to the chamber 280 formed on the face of the insert 150, separate from the rake face 254. In this way, the coolant flow is dispersed into a curtain configuration that then impinges on the interface between the chip of material being formed and the rake face 254.The coolant curtain flow provided by the first and second rake face coolant supply outlets 240, in conjunction with chamber 280, serves to disperse the coolant more directly over the melt boundary at an offset angle to the rake face and cutting edge interface, as in the previous examples. The coolant flow from the partial opening created by chamber 280 does not interrupt the flow of chips to the tool holder 212 channels as they form and are evacuated through the channels or other areas. The position of the vents 240 and chambers 280 maintains a substantially uniform coolant flow to the interface between the rake face and the forming chip, creating a coolant curtain across the rake face 254 from the offset position of the flutes.The dispersion of the incident coolant through the rake face 254 extends to the outer diameter of the cutting edges 256. The distance from the initial impact on the rake face 254 depends on the size of the insert 250, but is spaced to allow for the desired coolant dispersion. The outlets 240 are angled with respect to the sides of the insert 250 at an angle to produce the desired coolant dispersion. In this example, the coolant holes 240 can be substantially parallel or angled with respect to the axis of rotation of the insert 250, which, in conjunction with the chamber 280, produces the desired coolant dispersion.Thus, in operation, as in the previous examples, the chips formed along the cutting edges 256 from the center and along the rake face 254 receive a thermal shock as the material deforms at the cutting edges 256 to aid in chip segmentation. Another example is shown in Figures 12-13, with the system 310 including the support 312, which includes additional structures at its first end 320. The clamping arms 334 and 336 include first and second coolant supply holes on the inclined surface 340, opening onto the inner surface 382 of the groove 330. The outlets 340 lead to a chamber or cavity 380 formed in the side surface of the insert 350 in this example. The chamber 380 is configured to have a somewhat triangular shape, with the upper side opening onto the top of the insert 350. This intersects the interface between the side surface 382 and the top surface 384 of the arms 334 and 336, creating a partial opening at the interface. The opening is wide and narrow to allow the coolant to disperse in a curtain as desired while preventing the entry of chips or debris. Other appropriate forms of the 380 camera are being considered.In this example, the partial opening extends approximately from the center of the clamping arms 334 and 336 in 386 to a position adjacent to the inner edge of the clamping arms 334 and 336 in 388. In this way, the coolant supplied through the first and second coolant supply holes of the peel surface 340 flows into chamber 380 and then disperses from chamber 380 to the top of the chamber, forming a partial opening adjacent to the side surface of a cutting insert 350. This allows the application and flow of lubricating coolant directly to the peel face 354 adjacent to the cutting edges 356 of the cutting insert 350.In this example, the cutting edges 356 extend outward from the thickness of the insert body, and the coolant flow impinges directly on the rake face 354 and interacts with the cutting edges 356 to strike and facilitate chip formation. Again, this results in the minimization of undesirable heat, friction, and adhesion to the rake face 354 of the machined materials created by the cutting edges 356, allowing for higher penetration rates. Coolant flow diversion structures 390 may also be present on the side of the insert 350 to facilitate directing the coolant flow across the entire rake face, if desired, and / or into the chamber 380. The structures 390 may be one or more grooves on the side surface of the insert 350 or other appropriate configurations to control the coolant flow as desired.If desired, additional cooling holes can be used on the top of the clamping arms 334 and 336. The partial opening between the side surface of a cutting insert 350 created by the chamber 380 controls the flow and dispersion of the coolant through the entire peel face 354. Returning to Figures 14-15, the support 412 includes additional structures at its first end 420. The clamping arms 434 and 436 include first and second sloped coolant supply holes 440 that open into the inner surface 482 of the groove 430. The outlets 440 lead to a chamber or cavity 480 machined into the side surface of the clamping arms 440 adjacent to the tool centerline, for example. The chamber 480 is configured to have a somewhat triangular shape with its upper side opening into the top of the clamping arms 434 and 436, intersecting the interface between the side surface 482 and the top surface 484 of the arms 434 and 436, to create a partial opening at the interface. The opening is wide and thin to cause the coolant to disperse in a curtain as desired while preventing the entry of chips or debris.Other suitable shapes of chamber 480 are contemplated. In this example, the partial opening extends approximately from the center of the clamping arms 434 and 436 to a position adjacent to the inner edge of the clamping arms 434 and 436. In this way, the coolant supplied through the first and second sloped coolant supply holes 440 exits into chamber 480 and then disperses from chamber 480 to the top of the chamber, forming a partial opening adjacent to the side surface of a cutting insert mounted in the groove 430. This allows the application and flow of lubricating coolant directly to the rake face adjacent to the cutting edges of the cutting insert.Coolant flow diversion structures may also be formed on the side of the cutting insert to facilitate directing the coolant flow across the entire rake face, if desired, and / or in chamber 480. Additional coolant holes on the top of clamping arms 434 and 436 may be used if desired. The partial opening between the side surface of a cutting insert, created by chamber 480, controls the flow and dispersion of coolant across the entire rake face of the cutting insert. Returning to Figure 16, the support 512 includes additional structures at its first end. The clamping arms 534 and 536 include first and second sloped coolant supply ports 540 that open onto the inner surface 582 of the groove 530. The outlets 540 lead into a chamber or cavity 580 formed by additive manufacturing techniques in conjunction with the coolant channel and outlet 540, formed in the support 512 and the inner side portion of the clamping arms 534 and 536, for example. The chamber 580 and outlet 540 are configured to direct the coolant out of the chamber 580 in a dispersed pattern across the entire peel face of a cutting insert positioned in the groove 530. The top of the chamber 580 opens toward the top of the clamping arms. 534 and 536, which intersects the interface between the side surface 582 and the top surface 584 of the arms 534 and 536, to create a partial opening at the interface. The opening is directed and narrow to cause the coolant to disperse in a curtain as desired, while preventing the entry of chips or debris. Other suitable chamber shapes 580 are contemplated. Manufacturing or additive molding techniques allow the outlet 540 to be directed so that it disperses along the entire rake face of a cutting edge as desired. Other coolant flow diversion structures formed in conjunction with the outlet 540 or chamber 580 and / or in an insert placed in the support 512 may be used. If desired, additional coolant holes may be used in the upper portion of the clamping arms 534 and 536.The directed outlet 540 and partial opening between the side surface of a cutting insert created by the chamber 580 controls the flow and dispersion of coolant across the entire peel face of a cutting insert as desired. The terms comprising, including, and having, as used in the claims and specification herein, shall be deemed to refer to an open group that may include other unspecified items. The terms a, one, and the singular form of the words shall be deemed to include the plural form of the same words, such that the terms signify that one or more of something is provided. The terms at least one and one or more are used interchangeably. The term single shall be used to indicate that one and only one of something is intended. Similarly, other specific whole numbers, such as two, are used when a specific number of things is intended. The terms preferably, preferred, prefer, optionally, may, and similar terms are used to indicate that a referenced item, condition, or step is an optional (i.e., not required) feature of the modalities. Although this invention has been described with reference to embodiments thereof, such description is for illustrative purposes only and shall not be construed as limiting the scope of the claimed embodiments. Accordingly, the scope and content of the embodiments shall be defined solely by the terms of the following claims. Furthermore, it is understood that the features of any embodiment discussed herein may be combined with one or more features of any one or more embodiments discussed or otherwise contemplated herein, unless otherwise stated.

Claims

1. A drilling system, characterized in that it comprises a support having a rotation axis and first and second clamping arms with lateral surfaces forming a mounting groove, a cutting insert with sides positioned adjacent to the lateral surfaces of the mounting groove and cutting edges extending from the rotation axis and rake surfaces adjacent to the cutting edges positioned above the first and second clamping arms when the insert is mounted in the mounting groove, wherein the support comprises at least one coolant hole disposed through the first and second clamping arms oriented at an angle to one side of the insert, with a coolant outlet from the coolant hole in a position below the rake surfaces of the insert,wherein the coolant is dispersed across the entire rake face of each cutting edge after impacting the coolant outlet side of the insert, wherein the holder has channels adjacent to the first and second clamping arms for evacuation of chips formed by the cutting edges of the insert and the coolant outlet is positioned adjacent to the channel.

2. The drilling system of claim 1, characterized in that the coolant outlet is an opening in the upper edge of the side surfaces of the groove formed in the first and second clamping arms.

3. The drilling system of claim 1, characterized in that the coolant outlet is formed on only a portion of the extension of the upper part of the side surface of the mounting groove in the first and second clamping arms below the release surfaces.

4. The drilling system of claim 1, characterized in that the upper edge of the side surfaces of the groove formed in the first and second clamping arms below the peel faces is angled from top to bottom and the coolant outlet is positioned adjacent to the bottom.

5. The drilling system of claim 1, characterized in that the support comprises at least one coolant hole arranged through the first and second clamping arms, with a coolant outlet substantially at the intersection of the upper edge of the side surfaces of the groove formed in the first and second clamping arms, with the insert side in a position below the peel surfaces of the insert.

6. The drilling system of claim 1, characterized in that the coolant hole in each of the first and second clamping arms is supplied by at least one coolant channel formed in the support and the at least one coolant channel formed through the support has a larger diameter than the coolant holes in each of the first and second clamping arms.

7. The drilling system of claim 1, characterized in that the coolant hole is directed at an angle of between 10 and 40 degrees to the plane of the lateral surface of the insert and angled relative to the axis of rotation at an angle of between 10 and 30 degrees.

8. The drilling system of claim 1, characterized in that a second coolant hole is provided in each of the first and second clamping arms, having a second outlet positioned in association with the first and second clamping arms to direct the coolant to additional areas of a hole as it is formed.

9. The drilling system of claim 1, characterized in that the coolant outlet is created by at least one chamber in association with the insert and the side surface of the first and second clamping arms in the mounting groove.

10. The drilling system of claim 9, characterized in that at least one chamber is formed on the lateral surfaces of the insert and / or on the lateral surfaces of the mounting groove.

11. A drilling system, characterized in that it comprises a support having a rotation axis and first and second clamping arms with lateral surfaces forming a mounting groove, a cutting insert with sides positioned adjacent to the lateral surfaces of the mounting groove and cutting edges extending from the rotation axis and rake surfaces adjacent to the cutting edges positioned above the first and second clamping arms when the insert is mounted in the mounting groove, wherein the support comprises at least one coolant hole disposed through the first and second clamping arms, oriented at an angle to one side of the insert, with a coolant outlet from the coolant hole in a position below the rake surfaces of the insert, wherein the coolant is dispersed across the entire rake face of each cutting edge,after impacting the side of the coolant outlet insert, where the upper edge of the side surfaces of the groove formed in the first and second clamping arms, below the release faces, is angled from top to bottom and the coolant outlet is positioned adjacent to the bottom.

12. A method for supplying coolant in a drilling operation using a drilling tool comprising a holder having first and second ends and a rotation axis, the second end of the holder configured to be fixedly clamped in a drilling machine, and the first end of the holder comprising a mounting groove with side surfaces and a cutting insert positioned in the mounting groove, with side surfaces positioned adjacent to the side surfaces of the mounting groove and wherein the insert includes first and second cutting edges extending from the rotation axis and first and second peel faces adjacent to the cutting edges and above the mounting groove of the holder, and wherein the holder further includes at least one coolant orifice disposed through the first and second clamping arms oriented at an angle to one side of the insert,with a coolant outlet from the coolant hole in a position below the rake surfaces of the insert, wherein the holder has channels adjacent to the first and second clamping arms to evacuate chips formed by the cutting edges of the insert and the coolant outlet is positioned adjacent to the channel and supplies coolant to each of the coolant holes to the coolant outlets to disperse the coolant against the side of the insert and transverse to the rake surface of the first and second cutting edges.

13. The method of claim 12, characterized in that the coolant outlet is positioned substantially at the intersection of the upper edge of the side surfaces of the groove formed in the first and second clamping arms and with the insert side in a position below the release surfaces of the insert to disperse fluid against the insert side at the intersection.

14. The method of claim 12, characterized in that the upper edge of the side surfaces of the groove formed in the first and second clamping arms, below the release faces, is angled from top to bottom and the coolant outlet is positioned adjacent to the bottom.

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