Drilling system and method with coolant delivery device

Abstract

The present invention provides a drill assembly for drilling metal or other materials, including a holder having a mounting slot, a cutting blade located in the mounting slot, and a through-tool coolant supply system. The drill system allows coolant to be applied to the swept face of the cutting blade to help achieve a higher penetration rate while maintaining the integrity of the cutting edge of the cutting blade. The drill system includes a holder having a rotation axis and a mounting slot. A cutting blade is installed in the slot, and its side is located near the side of the mounting slot, and the cutting edge extends from the rotation axis. The blade includes a swept face adjacent to the cutting edge located above the mounting slot. At least one coolant channel is provided with at least one coolant outlet, which is directed to the side of the blade located below the swept face. The coolant outlet is configured to disperse the coolant in a curtain-like manner over the entire swept face of each cutting edge.

Description

[0001] Cross-references

[0002] This application claims priority to and the benefit of U.S. Patent Application No. 16 / 850,684, filed on April 16, 2020, and is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to a drill assembly for drilling metal or other materials, including a holder having a mounting slot and a through-tool coolant supply system, wherein a cutting insert is placed in the mounting slot. More specifically, the present invention relates to a drill system that allows coolant to be applied to the forward swept surface of the cutting insert to help achieve a higher penetration rate while maintaining the integrity of the cutting edge of the cutting insert. Background Art

[0004] In the metal cutting industry, there is a strong desire to utilize coolant to achieve better tool performance. The use of coolant provides lubricity, dissipates heat from the tool, and aids in chip evacuation. This results in faster tool speeds and longer tool life. While the use of coolant in drilling products across a variety of industries is typical, the drill tool industry continues to need a coolant delivery method that excels at targeting the interface between the chip and the swept face of the cutting geometry, especially in drill tools with two active cutting edges. Coolant delivery in such tools does not allow for higher penetration rates in drilling operations without sacrificing tool life. Achieving this is even more critical because the properties of many of the materials currently being drilled can generate undesirable heat, friction, and adhesion on the swept face of such drill tools, which can negatively impact drill performance. These undesirable effects are exacerbated by the desire to drill faster and faster in high production environments. Therefore, it is clear that there is a need to deliver coolant in a manner that can reduce heat, friction, and adhesion on the swept face during drilling operations to improve performance at speeds above similar drill design speeds. Summary of the invention

[0005] Therefore, the present invention is directed to a drill that minimizes unwanted heat, friction, and adhesion on swept surfaces of such drills. The drill system includes a holder having an axis of rotation and first and second clamp arms. Sides of the clamp arms form a mounting slot. A cutting blade is mounted in the slot with a side portion located adjacent to the side of the mounting slot and a cutting edge extending from the axis of rotation. The blade includes a swept surface adjacent to the cutting edge, and when the blade is mounted in the mounting slot, the swept surface is located above the first and second clamp arms. At least one coolant channel is disposed through the first and second clamp arms, wherein at least one coolant outlet is directed toward a side portion of the blade located below the swept surface. The coolant outlet is configured to distribute coolant in a curtain-like manner across the swept surface of each cutting edge.

[0006] According to an example, a drill assembly includes a holder having first and second ends and an axis of rotation. The second end of the holder is configured to be fixedly connected in a drilling machine, and the first end includes a holder slot, and at least a portion of the holder slot has a bottom support surface above it. At least one cutting blade having first and second sides is provided, and the first side is located in the holder slot and cooperates with the bottom support surface of the holder so that the blade and the holder have a common axis of rotation. The second side of the blade includes first and second dual effective cutting edges extending from the axis of rotation, and first and second swept faces adjacent to the cutting edges. The holder also includes at least first and second coolant holes, which extend through the holder and guide a certain amount of coolant to predetermined locations on the first and second swept faces, and spread the amount of coolant on the first and second swept faces, substantially covering the entire portion of the swept face adjacent to each cutting edge.

[0007] In one example, a drill tool assembly includes at least first and second coolant holes extending through a holder and having outlet openings in at least a portion of a holder slot and directing a volume of coolant at an angle to first and second swept faces at predetermined locations adjacent to the holder slot and at an angle to the swept faces. In one example, a drill tool assembly includes at least first and second coolant holes extending through a holder and having outlet openings in a holder slot and into at least one reservoir adjacent to the swept faces and directing a volume of coolant from the at least one reservoir to predetermined locations on the first and second swept faces.

[0008] The present invention also provides a method for delivering coolant during a drilling operation using a drill tool, the drill tool comprising a holder having first and second ends and a rotation axis. The second end of the holder is configured to be fixedly connected in a drilling machine, the first end of the holder comprises a mounting slot having a side and a cutting blade located in the mounting slot, the side of the cutting blade being located adjacent to the side of the mounting slot, and wherein the blade comprises first and second dual effective cutting edges extending from the rotation axis, and first and second swept faces adjacent to the cutting edges and located above the holder mounting slot, and wherein the holder further comprises at least first and second coolant outlets, the coolant outlets being located adjacent to the side of the blade and directing a quantity of pressurized coolant onto the side of the blade so that the coolant is substantially curtain-likely spread over the entire portion of the swept face adjacent to each cutting edge.

[0009] The coolant supply provides a constant directed coolant spray on the swept face of the cutting geometry, particularly on the swept face of the dual action cutting edge device. Typical drill designs do not target the directed coolant, but rely on the overflow effect of the coolant to reach this area. In addition, the coolant delivery system in the drill tool of the present invention also assists in chip segmentation through the thermal shock of the chips at the swept face provided by the directed coolant. The directed coolant also improves lubricity and coolant flow around the cutting area, minimizes chip re-cutting, and promotes better chip evacuation from the drill hole. It is also important to note that the coolant delivery system and method can be used in conjunction with other coolant outlets targeting other critical areas of the cutting action in the same drill body. Such additional coolant supply may depend on various factors and be application and material dependent.

[0010] Thus, the present invention provides an improved drill assembly and method that minimizes undesirable heat, friction and adhesion during drilling operations, thereby enabling the drill to be operated at higher speeds while providing extended tool life.

[0011] The above improvements and advantages, as well as other objects and advantages of the present invention, will become apparent from a reading of the detailed description of various examples taken in conjunction with the accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention and its features are described in more detail below by way of example in conjunction with the accompanying drawings, in which:

[0013] Figure 1 is a view of a drill tool holder body in one example.

[0014] Figure 2 yes Figure 1 A partial perspective view of the holder is shown.

[0015] Figure 3 It is installed in the drill assembly Figure 1 View of the cutting insert in the holder.

[0016] Figure 4 yes Figure 1 A partial cross-sectional view of the holder shown.

[0017] Figure 5 yes Figure 1 A partial cross-sectional view of the clamp shown, wherein Figure 2 The blade is installed together with the holder.

[0018] Figure 6 is a partial perspective view of an alternative example of a holder in the drill assembly of the present invention.

[0019] Figure 7 yes Figure 6A partial perspective view of the holder, wherein Figure 2 The blade is installed together with the holder.

[0020] Figure 8 yes Figure 6 A partial cross-sectional view of the clamp shown, wherein Figure 2 The blade is installed together with the holder.

[0021] Fig. 9 yes Figure 6 A partial cross-sectional view of the clamp shown, wherein Figure 2 The blade is installed together with the holder.

[0022] Fig.10 is a partial perspective view of an alternative example of a holder in the drill assembly of the present invention.

[0023] Fig.11 is a view of an alternative example of a cutting insert in a drill assembly of the present invention.

[0024] Fig.12 yes Fig.10 A partial cross-sectional view of the clamp shown, wherein Fig.11 The blade is installed together with the holder.

[0025] Fig.13 is a partial perspective view of an alternative example of a holder and cutting insert in the drill assembly of the present invention.

[0026] Fig.14 is a partial perspective view of an alternative example of a holder in the drill assembly of the present invention.

[0027] Fig.15 yes Fig.14 A partial perspective view of an example in which a cutting insert is mounted in a holder of a drill assembly of the present invention.

[0028] Fig.16 is a partial perspective view of an alternative example of a holder in the drill assembly of the present invention. Specific embodiments

[0029] Turning now to the examples of the present invention, it is noted that the coolant supply configuration has significant advantages in conjunction with a drill tool for making holes. Known coolant configurations for drill bits may include a coolant through-the-bit designed so that the coolant exits on the clearance surface of the drill bit's cutting geometry. This allows the coolant to be directed to the bottom of the drill hole. Other arrangements include a coolant outlet that exits in a drill flute and is directed toward the bottom of the drill hole. Such an arrangement is more likely to interrupt the flow of chips through the drill flute and have the coolant flow toward the bottom of the hole from a location away from the cutting end of the drill bit. In the examples of the present invention, the coolant supply configuration creates a superior coolant trajectory that better targets the entire rake face of the cutting geometry without interrupting the chip flow. These examples will be directed to improved coolant delivery systems and methods for improved drilling performance.

[0030] See also Figure 1-5 , a first example of a drill assembly is shown in the figure, generally indicated at 10. The drill assembly 10 includes a holder 12 having a shank 14 and a head 16 coupled thereto. The holder 12 has a generally cylindrical shape, having a first end 20 and a second end 22, the second end 20 and a portion of the shank 14 being adapted to be secured for use in a drilling machine. Figure 2 As shown, the first end 20 of the holder 12 has a clamping or locating slot 30 that can extend through the entire diameter of the head 16, or at least to a central portion at the approximate rotational axis of the holder 12. The locating slot 30 has a bottom wall 32 that is substantially perpendicular relative to the rotational axis 18 of the holder 12, or the bottom wall 32 can be angled or composed of multiple surfaces. Within the locating slot 30, at least one cutting blade 50 is precisely located relative to the holder 12 and cooperates with the wall 32. The cutting blade 50 performs the desired drilling function with the holder 12 and allows the blade 50 to be replaced when worn. The blade 50 has a dual effective cutting geometry, and its point geometry includes a plurality of cutting edges 56 that are precisely located relative to the rotational axis of the holder 12 to minimize errors in drilling operations performed using the assembly 10.

[0031] The holder 12 can be configured to include a pair of clamp arms 34 and 36 at its first end 20, the clamp arms extending to the locating slot 30. The clamp arms 34 and 36 include holes 38 that receive screws to secure the cutting insert 50 in position within the locating slot 30. The holes 38 are threaded holes and cooperate with screw holes 52 formed in the cutting insert 50 to accurately position the cutting insert 50 in a predetermined position within the locating slot 30. Each clamp arm 34 and 36 also includes first and second swept face coolant supply outlets 40, which are positioned to at least partially overlap the upper edge 44 of the upright wall 46 of each clamp arm 34 and 36, adjacent to the position of the side of the blade 50 below the swept face 54 associated with each cutting edge 56 in the cutting blade 50. The cutting edge 55 formed adjacent to the cutting edge 56 provides a geometry that can produce curled metal chips for evacuation. The size and shape of the chips can be controlled by changing the geometry of the cutting edge 55, such as the location, size and configuration. The swept face 54 may be formed as a flat, concave or curved surface and may have a rake angle of the swept face 54 formed at the cutting edge 56, which may be uniform or variable. The notch formed near the axis of rotation provides a notched cutting edge and a swept face adjacent to the cutting tip. The arms 34 and 36 may also include an inclined or curved surface that facilitates the removal of debris through the chip flutes 37 on each side of the holder 12, corresponding to one of the cutting edges 56. The bottom surface 58 of the cutting blade 50 mates with the support surface 32, and although a planar surface 32 is shown, it may also be another configuration corresponding to the shape of the bottom surface 32. A locating boss or locating pin (not shown) may be inserted into a hole formed in the bottom surface 32 of the locating slot 30 in the holder 12, which is precisely located relative to the axis of rotation of the holder 12. The cutting blade 50 includes a locating slot 60 that cooperates with the locating boss to precisely locate the blade 50 relative to the axis of rotation of the holder 12.

[0032] The cutting insert 50 may be a spade drill insert having a side edge 62 substantially parallel to the axis of rotation 18 of the holder 12 once the insert 50 is positioned and secured with the holder 12. The axis of rotation of the cutting insert 50 is preferably coaxial with the axis of rotation of the holder 12 when secured with the holder 12. The cutting insert 50 has a width and may include a lip 64 on the edge 62 to facilitate machining a hole having a desired finish characteristic. The cutting edge 56 on the cutting insert 50 is blunt V-shaped with a cutting edge 56 on each side of the axial center. The cutting edge 56 may include a plurality of cutting portions and chip breakers 66 that cooperate to provide a desired dual-effect cutting surface for the material and / or drilling application. Typically, the insert 50 is designed to cut when driven in rotation with the holder 12 in a predetermined direction and is non-reversible, although such drilling insert configurations are known to those skilled in the art and may be used with the present invention if desired. The mounting holes 52 cooperate with the holes 38 in the clamp arms 34 and 36 to secure the insert 50 within the locating slot 30 and against the bearing surface 32. The locating slot 60 allows for the positioning of a locating pin therein and an attachment screw (not shown) to bias the insert 50 and the slot 60 toward the locating pin so as to properly and accurately position the insert 50 relative to the holder 12 as desired. Other configurations are also contemplated to properly position the insert 50 relative to the holder. In this example, the cutting edge 56 is substantially parallel to the thickness of the insert 50 and is located below the thickness of the insert 50 by a certain amount, such as about 0.01 to 0.025 inches. The coolant is diffused from the coolant holes 40 so that the coolant impinges on the fusion interface of the chip being formed and just away from the forward swept surface 54.

[0033] In this example, the arrangement of the first and second swept face coolant supply outlets 40 allows lubricating coolant to be applied and flowed directly to the swept face 54 near the cutting edge 56 of the cutting insert 50, thereby minimizing unwanted heat, friction, and adhesion of the machined material to the swept face 54 generated by the cutting edge 56 in this type of tool assembly. This allows higher drilling speeds to be achieved during drilling operations. The clamping arms 34 and 36 may optionally include additional coolant outlets 48, which are provided on the top surface of the clamping arms 34 or 36 to provide additional coolant directed to the bottom of the hole to facilitate chip removal. During machining operations, the cutting edge 56 deforms and cuts the material, which generates a lot of heat and produces material debris. The material debris must be removed from the swept face and flushed out of the hole. The first and second swept face coolant supply outlets 40 provide a powerful flow of lubricating coolant directly to the surface of the blade 50 at a location spaced from the swept face 54 adjacent to the cutting edge 56 of the cutting insert 50. In this way, the coolant flow is dispersed in a curtain configuration and then impacts the interface between the material chip being formed and the swept face 54. The metal material undergoes mechanical and chemical processes at the fusion boundary of the formed chip, generating heat. The metal material is plastically deformed by the cutting edge 54. The coolant curtain flow provided by the first and second swept face coolant supply outlets 40 helps to penetrate the fusion barrier more directly by causing the coolant to flow to the swept face and cutting edge interface at an offset angle, impacting the side of the insert 50 below the swept face 54 in a dispersed manner at 70. The coolant flow from the outlet 40 also does not interfere with the flow of chips into the grooves in the holder 12, as the chips are formed and discharged from the grooves or other areas. The location of the outlet 40 maintains a substantially uniform flow direction between the swept face and the formed chip, which is achieved by the coolant flowing in the form of a curtain over the swept face 54 from an offset position near the center of the insert 50. The spread of the impinging coolant on the swept face 54 extends to the outer diameter of the cutting edge 56. The distance from the swept face 54 of the initial impact depends on the size of the blade 50, but is typically spaced about 0.2 to 1 inch above the centerline height of the blade 50, but may be any suitable size based on the size of the blade 50. The outlet 40 is angled relative to the side of the blade 50, such as an angle between 10 and 40 degrees, or any suitable angle based on the size of the blade 50, to produce a coolant dispersion, such as Figure 5As shown. For some applications, an angle of between 20 and 30 degrees is considered effective. The coolant holes 40 are also at a certain angle to the rotational axis of the insert, such as an angle of between 10 and 40 degrees, which is based on the width of the insert 50 to allow the coolant curtain to expand from adjacent locations near the rotational axis of the insert 50 and spread across the interface between the swept face and the chip formed during machining. For some applications, an angle of between 20 and 30 degrees is considered effective. The size and location of the coolant holes 40 at the junction between the clamp arms 34 and 36 and the side of the insert 50 also enables the required coolant volume to be dispersed at the junction of the swept face 54 and the fusion boundary of the chip formed at the cutting edge 56. The coolant can be supplied at a pressure of, for example, 500 to 1000 psi, but other pressures may be suitable or preferred depending on the application and the material being processed. Therefore, during operation, the chips formed along the swept face from the center along the cutting edge 56 are curled by the cutting edge 55 and the chip breaker 66 on the swept face 54, which generates stress, and then the chips are impacted by the coolant curtain supplied by the first and second coolant outlets 40 to impact the material, and the material is deformed at the cutting edge 56, thereby facilitating chip splitting. The coolant flowing out of the outlet 40 fans through the blade face and enters the swept face 54 to impact the fusion boundary when the chip is formed, and thermally shock the material when the chip is formed at the swept face interface.

[0034] In this example, the configuration of the first and second coolant outlet holes 40 at the junction of the clamp arms 34 and 36 with the side of the blade 50 has a portion, such as half of the diameter as shown, providing the desired dispersion of coolant along the entire swept face 54 to the outer diameter. The coolant outlet 40 forms a partial coolant hole out of the groove 30 and is directly located at the fusion boundary of the chip being formed. The coolant outlet 40 directs the coolant to the swept face and disperses the coolant on the swept face near the cutting edge 56, which is where the material chips are formed during the machining process. The configuration of the coolant hole 40 combined with the groove 30 and joined with the side of the blade 50 to provide a partial outlet at the junction causes turbulence and dispersion of the coolant flowing out of the partial orifice, thereby producing a larger dispersion of coolant relative to the diameter. This helps and produces the desired fan-shaped dispersion of coolant on the rake face 54. The half-hole structure in this example causes a left and right dispersion when leaving the orifice, and the reduced flow generated at the junction causes turbulence at the edge, thereby increasing the dispersion effect. Although a single coolant outlet 40 may provide the desired coolant dispersion across the swept face 54 , additional coolant holes or outlets may be used to cover the swept face if desired, or other configurations of partial outlets 40 may be used instead of the illustrated half circular hole.

[0035] As described below with reference to other examples, the insert 50 may also have a coolant guide structure on the insert surface to help direct the coolant to the swept face, as well as to form chips. The coolant flow along the swept face 54 also directly reaches the fusion boundary of the chip formed on the swept face 54. The coolant curtain supplied to the swept face further does not hinder the movement of the chips as they are formed in the grooves for discharge, but rather helps to curl and break up the chips as they are formed and leave the swept face. The coolant is directed from a position offset from the grooves to flow evenly across the surface of the insert 50 and the swept face 54 so that the formed chip flow crosses the top of the coolant flow and flows into the grooves for effective discharge, even with a large depth-to-diameter ratio. This arrangement also provides dispersion of the coolant to the outer diameter of the swept face 54, while still providing dispersion in the center of the tool.

[0036] See also Figure 6-9, shows another example of the drilling system 110 of the present invention. In this example, the configuration of the clamp 112 is similar to that described in the previous example, but includes additional structure at its first end 120. The clamp arms 134 and 136 include first and second swept coolant supply holes 140 that open into at least one chamber or pocket 180 formed adjacent to the inner surface 182 of the groove 130. The chamber 180 in this example is configured to have a certain triangle shape, with its top surface intersecting the junction between the side 182 and the top surface 184 of the arms 134 and 136 to create a partial opening at the junction. Other suitable shapes of the chamber 180 are also contemplated. In this example, the partial opening extends from approximately the center of the clamp arms 134 and 136 at a location 186 to a location 188 near the inner edge of the clamp arms 134 and 136. Thus, the coolant supplied through the first and second swept face coolant supply holes 140 flows into the chamber 180 and then disperses from the chamber 180, out of the top and partial opening of the chamber 180. The partial opening is formed near the side of the cutting blade 150 located in the groove 130. This allows the lubricating coolant to be directly applied and flow to the swept face 154 and the cutting edge 155, which is adjacent to the cutting edge 156 of the cutting blade 150. This again minimizes the unwanted heat, friction, and adhesion of the swept face 154 of the machined material generated by the cutting edge 156 to achieve a higher penetration rate. The partial opening of the chamber 180 formed near the side of the cutting blade 150 can also include a barrier structure 190 for preventing possible material debris in the chamber 180 during machining and / or facilitating the dispersion of the coolant in the chamber 180 into the swept face as needed. The structure 190 can have inclined sides to help guide the coolant flow as needed. Although not shown, additional outlets may be provided on the top surfaces of the arms 134 and 136 to provide additional coolant directed at the bottom of the hole as needed. Also in this example, the first and second swept face coolant supply outlets 140 provide a powerful flow of lubricating coolant directly to the surface of the blade 150 at a location spaced from the swept face 154 adjacent to the cutting edge 156 of the cutting blade 150. In this way, the coolant flow is dispersed into a curtain configuration and then impinges on the interface between the material debris being formed and the swept face 154. The coolant curtain flow provided by the first and second swept face coolant supply outlets 140 in conjunction with the chamber 180 is used to disperse the coolant more directly onto the fusion boundary at an offset angle to reach the swept face and cutting edge interface, as in the previous example. Similarly, the coolant flow in the partial opening formed by the chamber 180 does not interfere with the flow of debris into the groove of the holder 112 because the debris is formed and discharged from the groove or other area. The location of the outlet 140 and the chamber 180 maintains a substantially uniform flow of coolant to the junction between the forward swept surface and the formed chip, forming a coolant curtain that spans the forward swept surface 154 from the offset location of the groove.The spread of coolant impinging on the swept face 154 extends to the outer diameter of the cutting edge 156. The distance of the swept face of initial impact depends on the size of the insert 150, but is spaced a distance to allow for ideal spread of coolant. Fig. 9 As shown, the outlet 140 is angled relative to the side of the insert 150 to create a coolant dispersion. In this example, the coolant hole 140 may be substantially parallel to the axis of rotation of the insert, but then during machining, the chamber 180 is angled to create a coolant dispersion that is spread across the interface between the swept face and the chip being formed. Thus, as shown in the previous example, in operation, the chip formed from the center along the cutting edge 156 and the swept face 154 is subjected to thermal shock as the material deforms at the cutting edge 156 to aid in chip splitting.

[0037] like Figure 10-11As another example, the holder 212 may be configured similarly to that described in the previous example, but includes additional structure at its first end 220. The clamp arms 234 and 236 include first and second swept coolant supply holes 240 that open onto the inner surface 282 of the slot 230. In this example, the outlet 240 leads to a chamber or pocket 280 formed on the side of the blade 250. The chamber 280 is configured in a somewhat triangular shape, with the top side opening into the top of the blade 250, intersecting the junction between the side 282 and the top surface 284 of the arms 234 and 236 to create a partial opening at the junction. Other suitable shapes for the chamber 280 are also contemplated. In this example, the partial opening extends from approximately the center 286 of the clamp arms 234 and 236 to a location near the inner edge of the clamp arms 233 and 236 at 288. Thus, the coolant supplied through the first and second swept face coolant supply holes 240 enters the chamber 280 and then disperses from the chamber 280, exiting from the top and the partial opening of the chamber 280. The partial opening is located in the groove 230, formed near the side of the cutting blade 250. This allows the lubricating coolant to be directly applied and flow to the swept face 254 and the cutting edge 255 near the cutting edge 256 of the cutting blade 250. This will again minimize the unwanted heat, friction, and adhesion of the machined material to the swept face 254 generated by the cutting edge 256 to achieve a higher penetration rate. A coolant flow diversion structure 290 may also be formed between the sides of the cutting blade 250, near the partial opening formed by the chamber 280, to control the flow and diffusion of the coolant across the swept face 254. The structure 290 may be perpendicular to the side of the blade 250, tapering downward toward the swept face 254, but other suitable configurations such as curved members or grooves may be used to control the coolant flow if desired. In the illustrated configuration of the structure 290 or other suitable configurations, the structure 290 may also function as a chip breaker to facilitate chip formation when material is curled by the cutting edge 255 and the swept face 254. The replaceable cutting head 250 is responsible for shearing material from the workpiece, and the chip separator produces two or more chips, which are formed along the swept face 254 and are further broken or split by the structure 290 that functions as a chip breaker. The chip breaker 290 causes the chips to curl, creating stress that ultimately aids in chip splitting. The coolant delivery system provides a coolant chamber 280 that helps to arouse and disperse the coolant to impact all cutting edges of the cutting head 250. To further aid in the spread of coolant and aid in chip formation, the structure 290 also functions as a ridge for the chip breaker, and the structure 290 also allows the coolant to be introduced directly into the chip breaking zone through the coolant channels 292 formed between the ridges 290. While other tools deliver coolant parallel to the tool axis, supplying coolant to the cutting head by flooding holes formed in the tool, this and other designs of the present invention are intended to provide the ability to stir coolant across the blade surface and deliver it to the entire cutting edge.

[0038] Although not shown, additional outlets may be provided on the top surfaces of the arms 234 and 236 to provide additional coolant at the bottom of the hole as needed. Also in this example, the first and second swept face coolant supply outlets 240 supply a powerful flow of lubricating coolant directly to the chamber 280. The chamber 280 is formed at a location on the surface of the blade 150 spaced from the swept face 254. In this way, the coolant flow is dispersed into a curtain structure and then impinges on the interface between the material chip being formed and the swept face 254. The coolant curtain flow provided by the first and second swept face coolant supply outlets 240 together with the chamber 280 is used to disperse the coolant more directly onto the fusion boundary at an offset angle to the swept face and cutting edge interface, as in the previous example. The coolant flow in the partial opening created by the chamber 280 also does not interfere with the flow of chips into the grooves of the holder 212, because the chips are formed and discharged from the grooves or other areas. The location of the outlet 240 and the chamber 280 maintains a substantially uniform flow of coolant to the junction between the swept face and the formed chips, forming a coolant curtain across the swept face 254 from a location offset from the groove. The spread of impinging coolant on the swept face 254 extends to the outer diameter of the cutting edge 256. The distance from the initial impact swept face 254 depends on the size of the insert 250, but is spaced a certain distance to allow for ideal spread of coolant. The outlet 240 is angled relative to the side of the insert 250 to produce the desired coolant dispersion. In this example, the coolant hole 240 can be generally parallel or angled to the axis of rotation of the insert 250, and then combined with the chamber 280 to produce the desired coolant dispersion. Therefore, as shown in the previous example, in operation, the chips formed along the cutting edge 256 and along the swept face 254 are thermally shocked starting from the center as the material deforms at the cutting edge 256 to help chip splitting.

[0039] like Figure 12-13As another example, system 310 includes a holder 312 including additional structure at a first end 320 thereof. Clamp arms 334 and 336 include first and second swept-face coolant supply holes 340 that open on the inner surface 382 of slot 330. In this example, outlet 340 leads to a chamber or pocket 380 formed on the side of blade 350. Chamber 380 is configured in a triangular shape with the top side open toward the top of blade 350, intersecting the intersection between the side 382 and the top surface 384 of arms 334 and 336, thereby forming a partial opening at the intersection. The opening is wide and thin to cause coolant to spread in a curtain-like manner as desired while preventing the ingress of chips or debris. Other suitable shapes of chamber 380 are also contemplated. In this example, the partial opening extends approximately from the center of clamp arms 334 and 336 at 386 to a position 388 near the inner edge of clamp arms 333 and 336. Thus, the coolant supplied through the first and second swept face coolant supply holes 340 enters the chamber 380 and then disperses from the top of the chamber 380 and the partial opening formed near the side of the cutting insert 350. This allows the lubricating coolant to be directly applied and flow to the swept face 354 near the cutting edge 356 of the cutting insert 350. In this example, the cutting edge 356 extends outward from the thickness of the insert body, and the coolant flow directly impacts the swept face 354 and contacts the cutting edge 356 to impact and promote chip formation. Again, this will minimize the unwanted heat, friction and adhesion of the machined material generated by the cutting edge 356 to the swept face 354, thereby achieving a higher penetration rate. The side of the insert 350 may also have a coolant diversion structure 390 to facilitate directing the coolant flow through the entire swept face and / or chamber 380 as needed. The structure 390 can be one or more grooves on the side surface of the insert 350, or other suitable configurations to control the coolant flow as needed. Other coolant holes in the top of the clamp arms 334 and 336 can be used as desired. The partial opening formed by the chamber 380 between the sides of the cutting blade 350 controls the flow and diffusion of the coolant over the entire forward swept surface 354.

[0040] See also Figure 14-15, the clamp 412 includes additional structure at its first end 420. The clamp arms 434 and 436 include first and second swept-face coolant supply holes 440 that open on the inner surface 482 of the groove 430. For example, the outlet 440 opens into a chamber or groove 480 machined into the side of the clamp arm 440, near the tool centerline. The chamber 480 is configured in a triangular shape with the top side opening toward the top of the clamp arms 434 and 436, intersecting the intersection between the side 482 and the top surface 484 of the clamp arm 436, thereby forming a partial opening at the intersection. The opening is wide and thin, which can be used to spread the coolant in a curtain-like manner as desired while preventing chips or debris from entering. Other suitable shapes of the chamber 480 are also contemplated. In this example, the partial opening extends from approximately the center of the clamp arms 434 and 436 to a position near the inner edge of the clamp arms 436 and 436. Thus, coolant supplied through the first and second swept face coolant supply holes 440 enters the chamber 480 and then disperses from the top of the chamber 480 and the partial opening near the side of the cutting insert mounted in the slot 430. This allows the lubricating coolant to be directly applied to and flow to the swept face near the cutting edge of the cutting insert. The side of the cutting insert may also have a coolant diversion structure to direct the coolant flow across the swept face and / or chamber 480 as desired. Additional coolant holes in the top of the clamp arms 434 and 436 may be used as desired. The partial opening between the sides of the cutting insert formed by the chamber 480 controls the flow and diffusion of coolant across the swept face of the cutting insert.

[0041] See also Fig.16, the holder 512 includes additional structure at its first end. The clamp arms 534 and 536 include first and second swept face coolant supply holes 540 that open to the inner surface 582 of the slot 530. The outlet 540 leads to a chamber or pocket 580 formed by additive manufacturing techniques associated with coolant channels and outlets 540, formed within the clamp arm 512 and, for example, the inner portion of the clamp arms 534 and 536. The chamber 580 and outlet 540 are configured to direct coolant from the chamber 580 in a dispersed pattern to the entire swept face of the cutting insert located in the slot 530. The top of the chamber 580 is open toward the top of the clamp arms 534 and 536, intersecting the intersection between the side 582 and the top surface 584 of the arms 534 and 536, thereby forming a partial opening at the intersection. The opening is directional and thin to allow the coolant to spread in a curtain shape as needed while preventing chips or debris from entering. Other suitable shapes of chamber 580 are also contemplated. Additive manufacturing or molding techniques allow outlet 540 to be directed to spread along the entire swept face of the cutting edge as needed. Other coolant diversion structures associated with outlet 540 or chamber 580 may also be used and / or located on the blade in the holder 512. Additional coolant holes at the top of clamp arms 534 and 536 may be used as needed. The directional outlet 540 and partial opening control the flow and diffusion of coolant throughout the entire swept face of the cutting blade as needed. The partial opening is formed by chamber 580 between the sides of the cutting blade.

[0042] The terms "comprising," "including," and "having" as used in the claims and description herein should be deemed to indicate an open group that may include other unspecified devices. The terms "a," "an," and words in the singular should be deemed to include the plural form of the same words, thus these terms mean that one or more objects are provided. The terms "at least one" and "one or more" can be used interchangeably. The term "single" should be used to indicate one and only one of an object. Similarly, when a specific number of objects is required, other specific integer values, such as "two," are used. The terms "preferably," "preferred," "best," "optional," "may," and similar terms are used to indicate that the referred item, condition, or step is an optional (i.e., not required) feature of an embodiment.

[0043] Although the present invention is described with reference to embodiments of the present invention, it should be understood that such description is by way of example only and should not be construed as limiting the scope of the claimed embodiments. Therefore, the scope and content of the embodiments are defined solely by the terms of the claims. In addition, it should be understood that, unless otherwise stated, the features of any embodiment discussed herein may be combined with one or more features of any one or more embodiments discussed or contemplated herein.

Claims

1. A drilling system, comprising: A clamp having a rotation axis and first and second clamp arms, the sides of the clamp arms forming a mounting slot, a cutting insert having a side portion, a cutting edge, and a swept face, wherein when the insert is mounted in the mounting slot, the side portion is located adjacent to a side of the mounting slot, the cutting edge extends from the rotation axis, and the swept face is located adjacent to the cutting edge above the first and second clamp arms; wherein the holder includes at least one coolant hole arranged through the first and second clamping arms and at a certain angle to one side of the insert, and has a coolant outlet from the coolant hole at a position below the forward swept surface of the insert, wherein the coolant directly contacts the side of the insert at the angle of the at least one coolant hole, thereby dispersing the coolant over the entire forward swept surface of each cutting edge after impacting the side of the insert from the coolant outlet, wherein the holder has a groove near the first and second clamping arms for discharging chips formed by the cutting edge of the insert, and the coolant outlet is located near the groove.

2. The drilling system according to claim 1, wherein the coolant outlet is an opening formed at an upper edge of a side surface of a mounting groove formed by the first and second clamp arms.

3. The drilling system according to claim 1, wherein the coolant outlet is formed only on a portion of the top of the side surface in the first and second clamping arms below the forward swept surface.

4. The drilling system of claim 1, wherein top edges of the first and second clamp arms and the mounting slot sides below the forward swept surface are angled from top to bottom, and the coolant outlet is located near the bottom.

5. The drilling system of claim 1 , wherein the coolant outlet is located approximately at the top of the first and second clamp arms, at the junction of the side of the mounting slot and the side of the blade, and the side of the blade extends a predetermined distance above the coolant outlet to the forward swept surface of the blade.

6. The drilling system of claim 1 , wherein the coolant hole on each of the first and second clamp arms is provided by at least one coolant channel formed through the clamp, and the diameter of the at least one coolant channel formed through the clamp is greater than the diameter of the coolant hole on each of the first and second clamp arms.

7. The drilling system of claim 1, wherein the coolant holes are angled between 10 and 40 degrees relative to a plane of the insert side and between 10 and 30 degrees relative to the axis of rotation.

8. The drilling system of claim 1, wherein the coolant outlet is generated by at least one chamber associated with the blade in the mounting slot and the side surfaces of the first and second clamp arms; At least one additional coolant hole is also provided in the first and second clamp arms to supply coolant to other portions of the hole during drilling.

9. A drilling system comprising: A clamp having a rotation axis and first and second clamp arms, the sides of the clamp arms forming a mounting slot, A cutting insert having a side portion, a cutting edge and a front swept surface, wherein when the insert is mounted in the mounting slot, the side portion is located near a side of the mounting slot, the cutting edge extends from the rotation axis, and the front swept surface is located near the cutting edge above the first and second clamp arms, wherein the holder includes at least one coolant hole extending through the first and second clamp arms, the hole being angled with respect to one side of the insert, having a coolant outlet from the coolant hole at a position below the swept face of the insert, wherein the coolant directly contacts the side of the insert at the angle of the at least one coolant hole so as to be dispersed over the entire swept face of each cutting edge after impacting the side of the insert from the coolant outlet, wherein the top edge of the side of the groove formed in the first and second clamp arms below the swept face is angled from top to bottom, and the coolant outlet is located near the bottom.

10. A method of delivering coolant using a drill tool during a drilling operation, the drill tool comprising a holder having a first and a second end and a rotation axis, the second end of the holder being configured to be fixedly connected to a drilling machine, the first end of the holder comprising a mounting slot having a side and a cutting blade located in the mounting slot, the side of the cutting blade being located adjacent to the side of the mounting slot, wherein the blade comprises a first and a second cutting edge extending from the rotation axis, and a first and a second swept-forward surface adjacent to the cutting edge and located above the holder mounting slot, and wherein the holder further comprises at least one coolant hole, the coolant hole being disposed through the first and second clamp arms, at an angle to one side of the blade, having a coolant outlet from the coolant hole at a position below the swept-forward surface of the blade, wherein The holder has a groove near the first and second clamping arms for discharging chips generated by the cutting edge of the insert, the coolant outlet is located near the groove, and is used to supply coolant to each coolant hole to the coolant outlet to disperse the coolant to the side of the insert and throughout the forward swept surface of the first and second cutting edges.

Images