JP2017047517A - Arbor and fastener for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arbor which unfailingly supplies a coolant to an internal passage of a cutting tool with an inexpensive structure.SOLUTION: An arbor 1 includes: an arbor body 10 which is formed so that a coolant passage 12 penetrates through the arbor body 10 along an axis; and a fastener 40 which fixes a cutting tool 50 having an internal passage 54 to a tip of the arbor body 10. The fastener 40 includes: a fastener body 20 having a shaft part 21 which is threadedly engaged with a tip opening part of the coolant passage 12 to be attached thereto, and a head part 22 which is provided at a tip of the shaft part 21 and sandwiches the cutting tool 50 with the arbor body 10; and a fastening assistant tool 30 which is detachably attached to the fastener body 20 and is rotated integrally with the fastener body 20 by a rotary tool T. The fastener body 20 has a communication passage 23 which allows the coolant passage 12 and the internal passage 54 to communicate with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an arbor and an arbor fastener.

  Conventionally known is a center-through system in which a coolant flow path for supplying coolant to the cutting part is formed along the axis as an arbor on which cutting tools such as face mills and shell end mills are mounted by fasteners such as clamp bolts. It has been. The coolant is injected from an injection port formed at the center of the fastener located at the tip of the coolant channel. However, since the injection direction is the axial direction, it is difficult to distribute the coolant to the cutting portion. Therefore, recently, a configuration is known in which an internal flow path communicating with a coolant flow path is formed in a cutting tool, and coolant is supplied to a cutting portion from an injection port of the internal flow path.

  For example, Patent Document 1 discloses a configuration in which a groove is formed along the axial direction on the outer peripheral surface of the bolt portion of the fastener, and the internal flow path of the cutting tool communicates with the coolant flow path via the groove. . Patent Document 2 discloses a configuration in which a branch channel branched from the coolant channel is formed inside the arbor body, and this branch channel is communicated with the internal channel of the cutting tool.

Japanese Patent Laid-Open No. 2004-237401 JP 2008-12599 A

  The arbor disclosed in Patent Document 1 has a problem that the fastening strength of the cutting tool is lowered because a groove is formed in the threaded portion of the fastener. Further, the arbor disclosed in Patent Document 2 has a complicated formation of the branch flow path, which may increase the manufacturing cost.

  Therefore, an object of the present invention is to provide an arbor and an arbor fastener that can reliably supply coolant to an internal flow path of a cutting tool with an inexpensive configuration.

  The object of the present invention is an arbor provided with an arbor body formed so that a coolant channel penetrates along an axis, and a fastener for fixing a cutting tool having an internal channel to the tip of the arbor body. The fastener includes a shaft portion that is screwed into the distal end opening of the coolant channel, and the cutting tool that is provided at the distal end of the shaft portion and sandwiches the cutting tool between the arbor body. A fastener main body having a head, and a fastening auxiliary tool that is detachably attached to the fastener main body and rotates integrally with the fastener main body by a rotating tool, and the fastener main body includes: This is achieved by an arbor having a communication channel that communicates the coolant channel with the internal channel.

  In this arbor, it is preferable that the fastening aid has a tool hole into which a rotating tool is inserted.

  Moreover, it is preferable that the said fastener main body has a some engagement hole in the peripheral part of a front end surface, and the said fastening auxiliary tool is provided with the some engagement pin engaged with each said engagement hole.

  Further, the object of the present invention is an arbor fastener for fixing a cutting tool having an internal flow path to a distal end portion of an arbor body formed so that a coolant flow path penetrates along an axis, A shaft body mounted by screwing on the front end opening of the coolant flow path, and a fastener body having a head provided at the front end of the shaft section and sandwiching the cutting tool between the arbor body; A fastening aid that is detachably attached to the fastener body and rotates integrally with the fastener body by a rotating tool, the fastener body comprising the coolant channel and the internal channel; This is achieved by an arbor fastener having a communication flow path for communicating with each other.

  ADVANTAGE OF THE INVENTION According to this invention, the supply of the coolant to the internal flow path of a cutting tool can be reliably performed with an inexpensive structure, and the arbor and fastener for arbor can be provided.

It is a disassembled front view which shows the arbor which concerns on one Embodiment of this invention in a partial cross section. It is a side view of the fastener main body with which the arbor shown in FIG. 1 is provided. It is a side view of the fastening auxiliary tool with which the arbor shown in FIG. 1 is provided. It is a front view which shows the assembly | attachment state of the arbor shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded front view showing a part of a cross section of an arbor according to an embodiment of the present invention. The arbor 1 shown in FIG. 1 includes an arbor body 10 and a fastener 40, and a cutting tool 30 is fixed to the distal end portion of the arbor body 10 by the fastener 40. The arbor 1 of this embodiment is a center-through type face mill arbor, and a coolant channel 12 penetrating along the axis is formed in the arbor body 10.

  In the coolant channel 12, coolant can be introduced from the inlet 12 a on the proximal end side of the arbor body 10 in which the tapered shank portion 11 is formed, and is formed in the fitting portion 13 that protrudes from the tip of the arbor body 10. The coolant is discharged from the leading end opening 12b. The coolant is normally liquid, but may be in the form of a mist or gas. A screw portion 12c is formed on the inner peripheral surface of the tip opening portion 12b.

  The fastener 40 includes a fastener body 20 and a fastening aid 30. The fastener body 20 includes a shaft portion 21 having a screw portion 21 a that is screwed into the screw portion 12 c of the coolant channel 12, and a head portion 22 provided at the tip of the shaft portion 21. The head 22 is a disk-shaped member having a diameter larger than the diameter of the shaft portion 21.

  FIG. 2 is a side view of the fastener body 20 shown in FIG. 1 as viewed from the distal end side. As shown in FIGS. 1 and 2, a communication channel 23 is formed inside the fastener body 20. The communication channel 23 communicates with the opening 23 a formed on the base end surface of the shaft portion 21 on the base end side. The leading end side of the communication channel 23 is branched and communicates with a plurality of openings 23 b formed on the base end side of the head portion 22. A plurality of engagement holes 24 are formed in the peripheral edge portion of the distal end surface of the head portion 22.

  FIG. 3 is a side view of the fastening aid 30 shown in FIG. 1 as viewed from the distal end side. As shown in FIGS. 1 and 3, a plurality of fastening assisting tools 30 can be engaged with the respective engagement holes 24 of the fastening tool main body 20 on the proximal end side of the auxiliary tool main body 31 formed in a disc shape. The engaging pin 32 is provided. The fastening assisting tool 30 only needs to be detachable with respect to the fastening body 20 and can be rotated together with the fastening body 20 at the time of mounting, and the configuration thereof is not necessarily related to the engagement hole 24 and the engagement pin 32. It is not limited.

  A tool hole 33 formed of a through hole is formed in the center of the auxiliary tool body 31. The tool hole 33 is a hole for inserting the rotation tool T and rotating the fastening aid 30. In the present embodiment, the tool hole 33 is a hexagonal hole that can be engaged with a hexagon wrench. The fastening assisting tool 30 may be configured to be rotatable using a rotating tool. For example, instead of forming the tool hole 33 in the fastening assisting tool 30, a columnar part is provided, and a rotating tool such as a spanner is provided in this columnar part. The fastening assisting tool 30 may be configured to be engaged with each other.

  The cutting tool 50 has a mounting hole 51 formed of a through hole into which the fitting portion 13 of the arbor body 10 is inserted, and the base end surface 52 abuts on the step portion 14 formed around the fitting portion 13. Held. The cutting tool 50 is formed with a plurality of internal flow paths 54 that connect the attachment holes 51 and the vicinity of the chips 53. As the cutting tool 50 having such an internal flow path 54, for example, a commercially available tool such as a face mill cutter can be used.

  The arbor 1 having the above configuration inserts the fitting portion 13 of the arbor main body 10 into the mounting hole 51 of the cutting tool 50, rotates the fastening aid 30 attached to the fastener main body 20 with the rotation tool T, The fastener body 20 can be attached to the tip opening 12b of the arbor body 10 by screwing. Thereafter, by removing the fastening aid 30 from the fastening body 20, the cutting tool 50 is sandwiched between the step 14 of the arbor body 10 and the head 22 of the fastening body 20 as shown in FIG. 4. be able to.

  As shown in FIG. 4, the communication channel 23 of the fastener body 20 communicates with the coolant channel 12 of the arbor body 10 on the base end side. On the other hand, the front end side of the communication flow path 23 communicates with each internal flow path 54 of the cutting tool 50 via the internal space S of the cutting tool 50 closed by the fastener body 20. Thus, the coolant flow path 12 and the internal flow path 54 are communicated with each other via the communication flow path 23, and the coolant C supplied from the base end side of the arbor body 10 is supplied to each tip 53 of the cutting tool 50 as indicated by an arrow. It can be ejected from the vicinity.

  In the arbor 1 of this embodiment, a fastener 40 for fastening and fixing the cutting tool 50 to the arbor body 1 is detachably attached to the fastener body 20 and the fastener body 20 so that the fastener body 20 can be rotated. Since the fastening auxiliary tool 30 is provided, the communication flow path 23 for communicating the coolant flow path 12 and the internal flow path 54 can be easily formed inside the fastener main body 20. Therefore, unlike the prior art, there is no need to form a communication channel in the outer peripheral surface of the fastener body or the arbor body, and the coolant can be reliably supplied to the internal channel 54 with an inexpensive configuration.

DESCRIPTION OF SYMBOLS 1 Arbor 10 Arbor main body 12 Coolant flow path 12b Tip opening part 20 Fastener main body 21 Shaft part 22 Head part 23 Communication flow path 24 Engagement hole 30 Fastening auxiliary tool 32 Engagement pin 33 Tool hole 40 Fastening tool 50 Cutting tool 54 Inside Flow path

Claims (4)

An arbor body formed so that the coolant channel penetrates along the axis;
An arbor comprising a fastener for fixing a cutting tool having an internal flow path to the tip of the arbor body,
The fastener includes a shaft portion that is screwed into a distal end opening of the coolant channel, and a head that is provided at the distal end of the shaft portion and sandwiches the cutting tool between the arbor body. A fastener body having;
A fastening aid that is detachably attached to the fastener body and rotates integrally with the fastener body by a rotating tool;
The said fastener main body is an arbor which has a communicating flow path which connects the said coolant flow path and the said internal flow path.   The arbor according to claim 1, wherein the fastening aid has a tool hole into which a rotating tool is inserted. The fastener body has a plurality of engagement holes in the peripheral edge of the tip surface,
The arbor according to claim 1 or 2, wherein the fastening aid includes a plurality of engagement pins that engage with the respective engagement holes. An arbor fastener for fixing a cutting tool having an internal flow path to a distal end portion of an arbor body formed so that a coolant flow path penetrates along an axis,
A fastener body having a shaft portion screwed into a distal end opening of the coolant channel, and a head portion provided at a distal end of the shaft portion and sandwiching the cutting tool between the arbor body and ,
A fastening aid that is detachably attached to the fastener body and rotates integrally with the fastener body by a rotating tool;
The said fastener main body is a fastener for arbors which has a communicating flow path which connects the said coolant flow path and the said internal flow path.

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