JP2006181677A - Tool and method for drilling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fluctuation in the amount of cutting agent discharged from a plurality of cutting agent discharge ports. <P>SOLUTION: A taper reamer 1 is provided with cutting edges 3, 5, 7, 9 and 11 extending in the axial direction at equal intervals of the peripheral direction in a blade part 15 on the distal end side. Each of the cutting edges 3, 5, 7, 9 and 11 is provided with the three respective cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c), (9a, 9b, 9c) and (11a, 11b, 11c) as positions deviated in the axial direction. The hole diameters of the cutting agent discharge ports 3b, 5b, 7b, 9b and 11b at the center part of the axial direction are made larger than those of the cutting agent discharge ports 3a, 5a, 7a, 9a, 11a and 3c, 5c, 7c, 9c and 11c on both sides. As a result, fluctuation of discharge amount of the cutting agent from the plurality of cutting agent discharge ports is suppressed to improve machining efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drilling tool and a drilling method provided with a cutting agent flow path for flowing a cutting agent from a base end portion to a distal end side blade portion and discharging the cutting agent to the outside.

Conventionally, as a drilling tool that discharges a cutting agent from a cutting agent discharge port that is provided with a cutting agent flow path and is formed in a blade portion on the tip side, there is one described in Patent Document 1, for example. This is because the cutting agent supplied from the base end side of a cutting tool such as a reamer or drill to the through-hole serving as the cutting agent flow path is discharged from the openings serving as a plurality of cutting agent discharge ports provided on the distal end side. Is what you do.
JP 2002-36064 A

  However, in the conventional drilling tool described above, the discharge state such as the discharge amount of the cutting agent is not considered between the plurality of cutting agent discharge ports, and therefore the discharge is performed from the plurality of cutting agent discharge ports. Variations in the discharge state, such as the amount of cutting agent discharged, cause a reduction in processing efficiency.

  Accordingly, an object of the present invention is to improve machining efficiency by preventing variations in the discharge state such as the discharge amount of the cutting agent discharged from a plurality of cutting agent discharge ports.

  The present invention relates to a cutting tool formed in the blade portion along the axial direction in a drilling tool provided with a cutting agent flow path for flowing a cutting agent from a proximal end portion to a distal end blade portion and discharging the cutting agent to the outside. Correspondingly, at least three cutting agent discharge ports along the axial direction are provided in the blade portion so as to communicate with the cutting agent flow path, and at least the axial cutting ends of the at least three cutting agent discharge ports are provided. The main feature is that the hole diameter of the cutting agent discharge port in the central portion in the axial direction excluding the agent discharge port is made larger than the hole diameters of the other cutting agent discharge ports.

  Of the at least three cutting agent discharge ports provided on the cutting blade, the discharge pressure of the cutting agent discharged from the cutting agent discharge port at the central portion in the axial direction excluding at least the cutting agent discharge ports at both ends in the axial direction Since it becomes lower than the discharge pressure of the cutting agent discharged from the outlet, by making the hole diameter of the cutting agent discharge port in the central portion in the axial direction where this discharge pressure is lower than the hole diameter of other cutting agent discharge ports, This prevents a decrease in the discharge amount from the central portion in the axial direction, thereby suppressing variations in the discharge amount of the cutting agent from the plurality of cutting agent discharge ports and improving the machining efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the taper reamer 1 as a drilling tool according to the first embodiment of the present invention taken along the line A-A in FIG. Three cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c) provided corresponding to the three cutting blades 3, 5, 7, 9, 11 respectively. , (9a, 9b, 9c) and (11a, 11b, 11c). FIG. 2 is a bottom view of the taper reamer 1 as viewed from the front end side.

  The taper reamer 1 includes a base 13 that is detachably attached to a processing apparatus (not shown), and the above-described five cutting blades 3, 5, 7, 9, and 11 on the outer periphery of the shaft part 14 that are positioned on the distal end side of the base 13. It is comprised from the blade part 15 provided. The five cutting blades 3, 5, 7, 9, and 11 are all formed along the axial direction of the taper reamer 1, and are provided at equal intervals along the circumferential direction.

  A cutting agent flow path 17 is formed in the shaft core of the taper reamer 1 from the end of the base 13, that is, from the base end of the taper reamer 1 to the vicinity of the tip of the blade 15. The cutting agent flow path 17 is supplied with a cutting agent in which a small amount of cutting fluid is misted by pressurized air by a mist supply device (not shown). That is, the hole machining using the taper reamer 1 is a so-called semi-dry machining using a small amount of cutting fluid.

  The cutting agent discharge ports 3a, 3b, 3c corresponding to the cutting blade 3 as the first blade are opened on the outer peripheral surface of the shaft portion 14 between the cutting blade 3 and the cutting blade 5, as shown in FIG. Similarly, the cutting agent discharge ports 5a, 5b, 5c corresponding to the cutting blade 5 are between the cutting blade 5 and the cutting blade 7, and the cutting agent discharge ports 7a, 7b, 7c corresponding to the cutting blade 7 are the cutting blade 7. The cutting agent discharge ports 9a, 9b, 9c corresponding to the cutting blade 9 are between the cutting blade 9 and the cutting agent discharge ports 11a, 11b, 11c corresponding to the cutting blade 11 are between the cutting blade 9 and the cutting blade 11. Opening is made on the outer peripheral surface of the shaft portion 14 between the cutting blade 11 and the cutting blade 3.

  Moreover, as shown in FIG. 1, the cutting agent discharge ports (3a, 3b, 3c) and (9a, 9b, 9c) corresponding to the cutting blades 3 and 9 are connected to the branch flow paths (19, 21, 23), ( 20, 22, 24) communicated with the cutting agent flow path 17 described above, and the branch flow paths (19, 21, 23), (20, 22, 24) are connected to the cutting agent discharge port (3 a , 3b, 3c) and (9a, 9b, 9c) are inclined so as to be on the tip side (left side in FIG. 1) from the branching portion from the cutting agent flow path 17.

  The cutting agent discharge ports (5a, 5b, 5c), (7a, 7b, 7c), (11a, 11b, 11c) of the cutting edges 5, 7, 11 other than the cutting edges 3, 9 are also described above. Similarly to the cutting agent discharge ports (3a, 3b, 3c) and (9a, 9b, 9c) of the blades 3 and 9, as shown in FIG. 2, the branch channels (50, 51, 53), (70, 71, 73), (110, 111, 113) communicated with the cutting agent flow path 17, and these branch flow paths are the same as the branch flow paths (19, 21, 23), (20, 22, 24) described above. It is inclined to.

  Cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c), (9a, 9b) provided corresponding to the respective cutting edges 3, 5, 7, 9, 11 9c) and (11a, 11b, 11c), as shown in FIG. 1, the cutting agent discharge port 3a of the cutting blade 3 is located at the most distal side, and the cutting agent discharge port 5a of the cutting blade 5 is It is located on the more proximal side (right side in FIG. 1) with a predetermined dimension h, and hereinafter, the cutting agent discharge port 7a of the cutting blade 7, the cutting agent discharge port 9a of the cutting blade 9, and the cutting agent discharge port of the cutting blade 11. In the order of 11a, they are located on the base end side with a predetermined dimension h therebetween.

  Further, subsequently, the cutting agent discharge port 3b of the cutting blade 3, the cutting agent discharge port 5b of the cutting blade 5, the cutting agent discharge port 7b of the cutting blade 7, the cutting agent discharge port 9b of the cutting blade 9, and the cutting of the cutting blade 11 are performed. Cutting agent discharge port 11b, cutting agent discharge port 3c of cutting blade 3, cutting agent discharge port 5c of cutting blade 5, cutting agent discharge port 7c of cutting blade 7, cutting agent discharge port 9c of cutting blade 9, cutting of cutting blade 11 In the order of the agent discharge port 11c, they are located on the proximal end side with a predetermined dimension h therebetween.

  From the above, three cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c) of the five cutting blades 3, 5, 7, 9, 11 respectively. Of (9a, 9b, 9c) and (11a, 11b, 11c), the cutting agent discharge ports 3b, 5b, 7b, 9b, which are located in the central portion in the axial direction of each of the cutting blades 3, 5, 7, 9, 11 11b, as can be seen from FIG. 1, all the cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c), (9a, 9b, 9c), ( 11a, 11b, 11c), it is located at the axially central portion.

  Then, the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b located at the central portion in the axial direction have their hole diameters (for example, φ2) set to the cutting agent discharge ports 3a, 5a, and 7a located on both sides in the axial direction. 9a, 11a and the cutting agent discharge ports 3c, 5c, 7c, 9c, 11c are made larger than the hole diameter (for example, φ1).

  Here, the cutting agent fed into the cutting agent passage 17 in the base 13 in the form of a mist with the pressurized air is the cutting agent discharge port 3a at the most distal end in the cutting agent passage 17 in the blade portion 15. In consideration of the pressure from the position corresponding to 1 to the position corresponding to the cutting agent discharge port 11c on the most proximal side, the pressure is highest at the distal end side and lowest at the central portion in the axial direction.

  This is because the pressure increases on the distal end side because it is close to the closed end of the cutting agent flow path 17, and the proximal end closest to the upstream on the cutting agent supply side has the highest pressure next to the distal end side. Therefore, the central portion in the axial direction, that is, the position corresponding to the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b is the lowest pressure.

  In this state, as shown in FIG. 3, the taper reamer 1 rotates while supplying a mist-like cutting agent generated by a mist supply device (not shown) to the cutting agent passage 17 and discharging it from the cutting agent discharge port. In this state, it enters a processing hole (not shown) and finishes the tapered inner surface of the processing hole.

  At this time, the mist-like cutting agent supplied to the cutting agent flow path 17 is the cutting agent discharge port (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c), (9a, 9b, 9c), and (11a, 11b, 11c) are ejected from each to perform a lubrication and cooling function.

  At this time, in the present embodiment, the holes in the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b located at the central portion in the axial direction where the pressure in the cutting agent passage 17 at the blade portion 15 is the lowest. The diameter is made larger than the hole diameters of the cutting agent discharge ports 3a, 5a, 7a, 9a, 11a and the cutting agent discharge ports 3c, 5c, 7c, 9c, 11c located on both sides where pressure is higher.

  This prevents a decrease in the amount of the cutting agent discharged from the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b corresponding to low pressure parts, and the cutting agent discharge ports 3a, 5a, 7a, and 9a on both sides thereof. , 11a and the cutting agent discharge ports 3c, 5c, 7c, 9c, and 11c, the amount of cutting agent discharged from a plurality of cutting agent discharge ports Variation can be prevented, and the contact of the cutting edges 3, 5, 7, 9, and 11 with respect to the inner surface of the processing hole becomes appropriate, and processing efficiency is improved.

  FIG. 4 is a sectional view of a taper reamer 1 as a drilling tool according to the second embodiment of the present invention. In this embodiment, instead of increasing the hole diameter of the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b in the axial center portion in the first embodiment, the cutting agent discharge ports 3b, 5b, and 7b are used. , 9b, and 11b, the inclination angles η (for example, 60 degrees) of the branch flow paths 21, 51, 71, 22, and 111 are changed to the cutting agent discharge ports (3a, 3c), (5a, 5c), (7a , 7c), (9a, 9c), (11a, 11c) branch flow channels (19, 23), (50, 53), (70, 73), (20, 24), (110, 113), respectively. ) Is smaller than the inclination angle (α, β).

  In addition, the above-described branch channels (19, 21, 23), (50, 51, 53), (70, 71, 73), (20, 22, 24), (110, 111, 113) are tapered reamers 1. Are bent at a predetermined angle with the shaft core downstream from the branching portion from the cutting agent flow path 17 extending along the shaft core, and the bending angles are the inclination angles η, α, β described above. It corresponds to.

  As described above, by making the inclination angle η smaller than the inclination angles α and β, the branch flow passages 21, 51, 51, 51, 51, 51, 51 b, which communicate with the cutting agent discharge ports 3 b, 5 b, 7 b, 9 b, 11 b corresponding to the low pressure parts. 71, 22 and 111, the flow resistance of the cutting agent is branched on both sides (19, 23), (50, 53), (70, 73), (20, 24), (110, 113). It becomes lower than the flow path resistance of the cutting agent flowing through.

  As a result, similarly to the first embodiment, the amount of the cutting agent discharged from the cutting agent discharge ports 3b, 5b, 7b, 9b, and 11b is prevented from decreasing, and the cutting agent discharge ports 3a, 5a, and 7a on both sides thereof are prevented. , 9a, 11a and the amount of cutting agent discharged from the cutting agent discharge ports 3c, 5c, 7c, 9c, 11c. , And the contact of the cutting edges 3, 5, 7, 9, 11 with the inner surface of the processing hole becomes appropriate and the processing efficiency is improved.

  FIG. 5 is a cross-sectional view of the taper reamer 1 as a drilling tool according to the third embodiment of the present invention, taken along the line B-B in FIG. 6, and shows the first to fifth blades of the taper reamer 1 shown in FIG. 6. Three cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c) provided corresponding to the three cutting blades 3, 5, 7, 9, 11 respectively. , (9a, 9b, 9c) and (11a, 11b, 11c). FIG. 6 is a bottom view of the taper reamer 1 as viewed from the front end side.

  In this embodiment, three cutting agent discharge ports (3a, 3b, 3c), (5a, 5b, 5c), (7a, 7b, 7c), ( 9a, 9b, 9c), (11a, 11b, 11c) are provided at the same position in the axial direction (positions on the same circumference centered on the axis) between the cutting blades 3, 5, 7, 9, 11. ing.

  That is, each cutting agent discharge port 3a, 5a, 7a, 9a, 11a on the tip side of each of the cutting blades 3, 5, 7, 9, 11 is set to the same position in the axial direction, and each cutting agent discharge port 3b adjacent to this. , 5b, 7b, 9b, and 11b are set to the same axial position, and the cutting agent discharge ports 3c, 5c, 7c, 9c, and 11c are set to the same axial position.

  Thereby, the variation of the cutting agent discharge amount for each of the cutting blades 3, 5, 7, 9, and 11 is suppressed and uniformized, and the surface of the cutting blades 3, 5, 7, 9, and 11 on the inner surface of the processing hole in the taper reamer processing. The processing efficiency is improved with a proper hit.

FIG. 2 is a cross-sectional view of the tapered reamer according to the first embodiment of the present invention taken along the line AA in FIG. 2 and shows the positional relationship of cutting agent discharge ports provided corresponding to the five cutting edges of the tapered reamer. It is the bottom view seen from the front end side of the taper reamer of FIG. It is operation | movement explanatory drawing which shows the state which is supplying the cutting agent to the cutting agent flow path in the taper reamer of FIG. It is sectional drawing of the taper reamer concerning the 2nd Embodiment of this invention. FIG. 6B is a cross-sectional view of the tapered reamer according to the third embodiment of the present invention, taken along line B-B in FIG. 6, along with the positional relationship of the cutting agent discharge ports provided corresponding to the five cutting edges of the tapered reamer. It is the bottom view seen from the front end side of the taper reamer of FIG.

Explanation of symbols

1 Taper reamer (hole drilling tool)
3, 5, 7, 9, 11 Cutting blades 3a, 3b, 3c, 5a, 5b, 5c, 7a, 7b, 7c, 9a, 9b, 9c, 11a, 11b, 11c Cutting agent discharge port 15 Cutting portion 17 Cutting agent Channel 19, 21, 23, 50, 51, 53, 70, 71, 73, 20, 22, 24, 110, 111, 113 Branch channel η, α, β Inclination angle (bending angle)

Claims (5)

  In the drilling tool provided with a cutting agent flow path for discharging the cutting agent from the proximal end portion to the cutting edge portion on the distal end side and discharging it to the outside, corresponding to the cutting blade formed in the blade portion along the axial direction, At least three cutting agent discharge ports along the axial direction are provided in the blade portion so as to communicate with the cutting agent flow path, and at least the cutting agent discharge ports at both ends in the axial direction among the at least three cutting agent discharge ports. A drilling tool characterized in that the hole diameter of the cutting agent discharge port in the central portion excluding the axial direction is larger than the hole diameter of other cutting agent discharge ports.   In the drilling tool provided with a cutting agent flow path for discharging the cutting agent from the proximal end portion to the cutting edge portion on the distal end side and discharging it to the outside, corresponding to the cutting blade formed in the blade portion along the axial direction, At least three cutting agent discharge ports along the axial direction are provided in the blade portion so as to communicate with the cutting agent passage through branch passages, and each branch passage extends along the axis. Bending at a predetermined angle with the axial center downstream from the branch portion from the cutting agent flow path, and this bending angle is at least in the axial direction excluding the branch flow paths communicating with the cutting agent discharge ports at both ends in the axial direction A drilling tool characterized in that a branch channel communicating with a cutting agent discharge port in a central portion is set smaller than other branch channels.   In a drilling tool provided with a cutting agent flow path for flowing a cutting agent from a base end portion to a distal end side blade portion and discharging the cutting agent to the outside, a cutting blade extending in the axial direction is provided on the blade portion in a circumferential direction. A plurality of cutting blades are provided at predetermined intervals along the cutting blades, and a cutting agent discharge port communicating with the cutting agent flow path is provided corresponding to the plurality of cutting blades. A drilling tool characterized by being provided at the same axial position between each other.   In a hole drilling method for drilling with a drilling tool provided with a cutting agent flow path for flowing a cutting agent from a proximal end portion to a distal end blade portion and discharging the cutting agent to the outside, the blade portion is provided along an axial direction. And a plurality of cutting agent discharge ports communicating with the cutting agent flow path in the blade portion, and the amount of cutting agent discharged from the plurality of cutting agent discharge ports is equal to each other. A hole drilling method characterized by performing hole drilling.   In a hole drilling method for drilling with a drilling tool provided with a cutting agent flow path for flowing a cutting agent from a proximal end portion to a distal end blade portion and discharging the cutting agent to the outside, the blade portion is provided along an axial direction. A plurality of cutting blades extending at predetermined intervals along the circumferential direction, and corresponding to the plurality of cutting blades, there are provided cutting agent discharge ports respectively communicating with the cutting agent flow paths, A hole drilling method comprising: drilling holes in a state in which the discharge positions of the cutting agents discharged from the respective cutting agent discharge ports corresponding to the above are equal to each other in the axial direction.

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