JP2011073102A - Boring bar device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensively and compactly constructible boring bar device. <P>SOLUTION: This boring bar device 6 is constituted of: a long size boring bar body 21 for arranging a tool on the tip; a housing 22 for clamping its boring bar body 21 around a main spindle 2 of a tool post 1 in a state of being arranged on a spindle head; and a holder 8 to be clamped by a tapered part 11 of the main spindle 2. When clamping the housing 22 around the main spindle 2, a coupler 9-2 on the base end of the housing 22 engages with a coupler 9-1 on the axial end of the holder 8, and a pipe 23 in the boring bar body 21 and the housing 22, a pipe 26 of the holder 8, and a supply pipe 15 in the main spindle 2, communicate with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a boring bar device used when boring a workpiece in a machine tool.

  When a deep boring or the like is performed on a workpiece in a machine tool, a long boring bar (long boring bar) device in which a blade is fixed to the tip is used. As such a boring bar device, as disclosed in Patent Document 1, a hook installed on an upper surface of a boring bar main body is engaged with a hook provided on a lower surface of a tool rest of a machine tool to be mounted below the tool rest. Things are known.

Japanese Patent No. 3908495

  However, since the boring bar device of Patent Document 1 is mounted at a position different from the machining spindle when the normal tool of the tool post is mounted, the cutting fluid is desired to be discharged from the vicinity of the tool at the tip. In this case, a dedicated distribution path for the boring bar device (distribution path for the cutting fluid) must be provided separately from the distribution path for a normal tool, so that it cannot be constructed at low cost. In addition, if a dedicated distribution path is installed separately from a normal distribution path for tools, it is difficult to design a compact distribution path.

  An object of the present invention is to provide a boring bar device that can solve the problems of the conventional boring bar device and can be constructed inexpensively and compactly.

  Among the present inventions, the invention described in claim 1 is a main spindle in a machine tool provided with a cutting fluid supply device for supplying a cutting fluid to a tool attached to the main shaft via a supply pipe provided at the shaft center of the main shaft. A boring bar device fixed to the head, comprising a long boring bar main body provided with a tool at the tip, and a housing for clamping the boring bar main body around the main shaft with the boring bar main body arranged on the main shaft head. And a pipe for connecting to the supply pipe of the main shaft is provided so as to penetrate from the base end to the front end of the boring bar main body, and the base end of the pipe is along the axial direction of the main shaft It is characterized by being movable.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the base end portion of the pipe can be clamped by a clamp device provided on the main shaft. .

  The invention described in claim 3 is the invention described in claim 2, wherein a base end portion of the pipe is provided to be separable from a boring bar main body, and a base end portion of the pipe and the boring A coupler capable of relative movement along the axial direction of the main shaft is provided between the bar main body and the bar main body.

  The boring bar device according to claim 1 supplies the cutting fluid delivered by the cutting fluid supply device to the tip of the boring bar main body using the same supply path as that used when a tool is mounted on the spindle head. Therefore, it can be constructed at a lower cost and more compact than those provided with a dedicated cutting fluid supply path. Also, because the housing is clamped around the spindle, it can be attached to the machine tool more firmly than the one where the boring bar body is directly fixed to the spindle head, and the bending stress from the drive spindle side It is possible to prevent such a situation that a burden is applied to the support structure on the machining spindle side. Furthermore, since the base end of the pipe provided so as to penetrate the boring bar main body is movable along the axial direction of the main shaft, the base end of the pipe is adjusted in accordance with the clamped state between the housing and the periphery of the main shaft. Can be flexibly connected to the supply pipe in the main shaft.

  In the boring bar device according to claim 2, since the base end portion of the pipe can be clamped by the clamp device provided on the main shaft, the same operation as that when mounting the tool on the main shaft head is performed. The proximal end can be reliably connected to the supply pipe in the main shaft.

  In the boring bar device according to claim 3, the base end portion of the pipe is provided to be separable from the boring bar main body, and between the base end portion of the pipe and the boring bar main body, in the axial direction of the main shaft. Since the coupler which can move relatively along is provided, the base end portion of the pipe can be separated from the boring bar main body and stored in the tool magazine of the machine tool. Moreover, when attaching to a machine tool, the base end part of piping and the piping in a boring bar main body can be connected very easily and reliably.

It is explanatory drawing (vertical sectional drawing in alignment with the axis line of a main axis | shaft) which shows the tool post of the machine tool with which the tool was mounted | worn. It is explanatory drawing which expands and shows the front-end | tip part of the main axis | shaft of a tool post. It is explanatory drawing (vertical sectional drawing in alignment with the axis line of a main axis | shaft) which shows the tool post of the machine tool equipped with the boring bar apparatus.

  Hereinafter, an embodiment of a boring bar device according to the present invention will be described in detail with reference to the drawings.

<Structure of the tool post for mounting the boring bar device>
FIG. 1 shows a tool post (a state in which a tool is mounted) of a machine tool to which a boring bar device according to the present invention can be mounted. The shaft hole 2a is provided so as to penetrate the front and rear. A tapered portion 11 is provided at the distal end of the main shaft 2 so as to gradually increase in diameter from the proximal end side to the distal end side, and the tapered portion 11 is in communication with the shaft hole 2a.

  FIG. 2 is an enlarged view of the tip end portion of the main shaft 2, and a cylindrical collet having a plurality of collet pieces functioning as a clamping device inside a connecting portion with the tapered portion 11 of the shaft hole 2a. A nail 4 is provided. The tool 3 is held by the collet claw 4. Note that the base end of the tool 3 is formed in a truncated cone shape that matches the tapered portion 11 of the main shaft 2, and a pull stud 12 is provided at the tip of the truncated cone portion. A pipe 13 for circulating the cutting fluid is provided at the center of the tool 3.

  A draw bar 5 is provided in the shaft hole 2a of the main shaft 2 so as to be movable in the axial direction, and is urged rearward by a disc spring provided in the shaft hole 2a. . A pressing body is fixed to the leading end of the draw bar 5, and the leading end of the pressing body is engaged with the hook-shaped portion of the base end of the collet claw 4. On the other hand, a concave groove 14 is provided on the outer periphery of the connecting portion with the tapered portion 11 of the shaft hole 2a. Further, a supply pipe 15 for circulating the cutting fluid is provided at the center of the shaft hole 2a, and is connected to a cutting fluid supply device (not shown) provided outside the tool post 1. It has become.

  In addition, a plurality of (four) collet claws 7, 7,... For holding the boring bar device are scattered around the circumference centered on the main shaft 2 at equal intervals on the outside of the main shaft 2. Is provided. The structure of the collet claws 7 and 7 is substantially the same as the structure of the collet claw 4 described above, and the structure around the collet claws 7 and 7 is also substantially the same as the structure of the collet claw 4 described above. That is, the draw bar is provided in the shaft hole provided with the collet claw 7 so as to be movable along the axial direction, and is urged rearward by the disc spring. Further, a pressing body is fixed to the leading end of the draw bar, and the leading end of the pressing body is engaged with the hook-shaped portion of the base end of the collet claw 7.

  In the tool post 1 configured as described above, when the draw bar of the main shaft 2 is slid to the base end side by the urging force of the disc spring, the tip of the collet claw 4 is disengaged from the concave groove 14 of the shaft hole 2a. By pulling the pull stud 12 into the inside (base end side), the base end of the tool 3 is fixed to the taper portion 11. As described above, in a state where the base end of the tool 3 is fixed to the tapered portion 11, the supply pipe 15 in the shaft hole 2a and the pipe 13 in the tool 3 are in communication with each other, and are supplied from the cutting fluid supply device. The cutting fluid discharged from the tip of the tool 3 can wash away the cutting waste of the workpiece (the state shown in FIGS. 1 and 2).

  On the other hand, when the draw bar of the main shaft 2 is slid to the tip side against the urging force of the disc spring, the tip of the holding body pushes the pull stud 12 and pushes the tool 3 forward, and the concave of the shaft hole 2a. Since the tip of the collet claw 4 fits into the groove 14 and the engagement state between the pull stud 12 and the tip of the collet claw 4 is released, the tool can be removed.

<Structure of boring bar device>
FIG. 3 shows a state in which a long boring bar device (long boring bar device) 6 is held on the tool post 1 described above. The boring bar device 6 includes a boring bar main body 21, a housing 22, and a holder 8 connected to the base end side of the housing 22.

  The boring bar main body 21 is formed in a long cylindrical shape, and a blade (tool) is provided at the tip. A housing 22 formed in a flange shape (hollow and flat cylindrical shape) is fixed to the base end of the boring bar main body 21 concentrically with the boring bar main body 21. A plurality (six) of pull studs 24, 24... Are installed at equal intervals along the circumferential direction (collet claws 7, 7.・ It is installed in the same arrangement. Each of the pull studs 24, 24... Protrudes outward in a concave portion formed on the bottom surface of the housing 22. The boring bar main body 21 and the housing 22 are provided with a pipe 23 for circulating the cutting fluid so as to penetrate the front and rear along the axis, and the coupler 9 provided at the base end of the housing 22. -2 (for example, the male side of a Pascal mini coupler).

  The structure of the holder 8 is the same as the structure of the base end side of the tool 3 described above, and the base end side is formed in a truncated cone shape that matches the tapered portion 11 of the main shaft 2. A pull stud 25 is provided at the tip of the. Further, a pipe 26 for circulating the cutting fluid is provided in the axial center of the holder 8 so as to penetrate the front and rear, and a coupler 9-1 (for example, a mini coupler manufactured by Pascal, Inc.) provided at the tip of the axial center. The female side).

  The coupler 9-2 provided at the proximal end of the housing 22 and the coupler 9-1 provided at the distal end of the holder 8 are formed so as to be able to engage with each other along the axial direction of the main shaft 2. In the engaged state, the valve body located at the axis of each of the couplers 9-1 and 9-2 is pushed into the inside, and the valve body located around the axis of the coupler 9-1 is pushed into the inside. Therefore, when the cutting fluid can be passed and the engagement between the two is released, the valve body is closed in each of the couplers 9-1 and 9-2, and the liquid does not flow out. .

  When the boring bar device 6 configured as described above is mounted on the tool post 1, the draw bar of the main shaft 2 is moved to the base end side by the biasing force of the disc spring with the holder 8 inserted into the tapered portion 11 of the main shaft 2. Slide to. When the draw bar is slid to the base end side in this way, the tip of the collet claw 4 is detached from the concave groove 14 of the shaft hole 2a, and the pull stud 25 of the holder 8 is pulled into the inside (base end side). 2 is fixed (clamped) to the second taper portion 11.

  The pull studs 24, 24,... Provided on the bottom surface of the housing 22 are provided around the spindle 2 of the tool post 1 with the holder 8 fixed to the tapered portion 11 of the spindle 2 as described above. Engage with the collet claws 7, 7,... (That is, slide the draw bar to the base end side, and place the pull studs 24, 24,... Inside the tool rest 1 by the tips of the collet claws 7, 7,. Pull in). When the pull studs 24, 24... On the bottom surface of the housing 22 are engaged with the collet claws 7, 7... Of the tool post 1, the coupler 9-2 is attached to the holder at the shaft center of the boring bar device 6. 8 is engaged with the coupler 9-1 provided at the tip of the pipe 8, the pipe 23 in the boring bar body 21 and the housing 22, the pipe 26 of the holder 8, and the supply pipe 15 in the main shaft 2 are in communication with each other. The cutting fluid supplied from the cutting fluid supply device can be discharged from the tip of the boring bar main body 21 to wash away the cutting waste of the workpiece (state of FIG. 3).

  On the other hand, when removing the boring bar device 6 from the tool post 1, when the draw bar is slid toward the tip side against the biasing force of the disc spring in the installation part of the collets 7, 7. The pull studs 24, 24,... Of the housing 22 are disengaged from the tips of the collet claws 7, 7, and the housing 22 can be removed from the tool rest 1. When the draw bar is slid to the tip side against the biasing force of the disc spring in the main shaft 2, the engagement state between the pull stud 25 of the holder 8 and the tip of the collet claw 4 is released, and the holder 8 is moved to the blade. It can be removed from the base 1.

<Effect of boring bar device>
As described above, the boring bar device 6 includes a long boring bar main body 21 provided with a tool at the tip, and a housing 22 for clamping the main body 2 around the main shaft 2 in a state where the boring bar main body 21 is disposed at the main shaft head. And a pipe (pipe 23 and pipe 26) for connecting to the supply pipe 15 of the main shaft 2 is provided so as to penetrate from the base end to the tip end of the boring bar main body 21. The base end (pipe 26) is movable along the axial direction of the main shaft 2. Therefore, the cutting fluid sent by the cutting fluid supply device can be supplied to the tip of the boring bar main body 21 using the same supply path as when the tool 3 is mounted on the spindle head. It can be constructed cheaper and more compactly than those provided with a supply path. Further, since the housing 22 is clamped around the spindle 2, it can be firmly attached to the tool post 1 as compared with the case where the boring bar main body 21 is directly fixed to the spindle head, and the drive spindle side By suppressing the transmission of bending stress and the like, it is possible to prevent a situation in which a burden is applied to the support structure on the main shaft 2 side. Further, since the base end (pipe 26) of the pipe provided so as to penetrate the boring bar main body 21 is movable along the axial direction of the main shaft 2, the housing 22 and the periphery of the main shaft 2 are clamped. In addition, the base end (pipe 26) of the pipe can be flexibly connected to the supply pipe 15 in the main shaft 2.

  Moreover, since the holder 8 provided with the base end portion (pipe 26) of the pipe can be clamped by the clamp device (clamp claw 4) provided on the main shaft 2, the boring bar device 6 can be used to fix the tool 3 to the main shaft. The base end portion (pipe 26) of the pipe can be reliably connected to the supply pipe 15 in the main shaft 2 by the same operation as that when mounting on the head.

  Further, the boring bar device 6 is provided with a holder 8 provided with a base end portion (pipe 26) of the pipe so as to be separable from the boring bar main body 21, and a base end portion (pipe 26) of the pipe and the boring bar. Since the couplers 9-1 and 9-2 that are relatively movable along the axial direction of the main shaft 2 are provided between the main body 21 and the holder 8 provided with the base end portion (pipe 26) of the pipe, It can be separated from the boring bar main body 21 and stored in the tool magazine of the machine tool. Further, when mounting on a machine tool, the base end portion (pipe 26) of the pipe and the pipe 23 in the boring bar main body 21 can be connected very easily and reliably.

<Example of changing the boring bar device>
The configuration of the boring bar device according to the present invention is not limited to the aspect of the above embodiment, and the configuration of the shape and structure of the boring bar main body, housing, holder, piping, coupler, etc. is the gist of the present invention. As long as it does not deviate from the above, it can be changed as necessary. Further, the configuration of the machine tool (tool post) on which the boring bar device is mounted is not limited to the aspect of the above embodiment, and the shape and structure of the clamping means (collet claw), supply pipe, coupler, etc. The configuration can be appropriately changed as necessary without departing from the spirit of the present invention.

  For example, the boring bar device and the tool post are not limited to the one that discharges the cutting fluid sent from the supply device from the tip of the boring bar main body, and the one that discharges the air sent from the compressor or the like from the tip of the boring bar main body. It is also possible to change to

  Further, the boring bar device is not limited to the one that is attached to the tool post by engaging the pull stud provided on the bottom surface of the housing with the collet claw provided around the spindle, and the collet claw on the bottom surface of the housing. It is also possible to change the collet claw to one that is attached to the tool post by engaging a pull stud protruding around the main shaft with the collet claw.

  Since the boring bar device of the present invention has excellent effects as described above, it can be suitably used as an attachment for a machine tool when boring or the like.

DESCRIPTION OF SYMBOLS 1 .... Tool post 2. Spindle 3. Tool 4. Collet claw 6. Boring bar device 8. Holder 9-1, 9-2. Coupler 15. Supply pipe 21. Boring bar body 22.・ ・ Housing 23 ・ ・ Piping 26 ・ ・ Piping

Claims (3)

A boring bar device fixed to the spindle head in a machine tool provided with a cutting fluid supply device for supplying a cutting fluid to a tool attached to the spindle via a supply pipe provided at the center of the spindle,
A long boring bar body with a tool at the tip,
A housing for clamping the boring bar body around the spindle in a state where the boring bar body is arranged at the spindle head,
A pipe for connecting to the supply pipe of the main shaft is provided so as to penetrate from the base end to the front end of the boring bar main body, and the base end of the pipe is movable along the axial direction of the main shaft. A boring bar device characterized by that.   The boring bar device according to claim 1, wherein a proximal end portion of the pipe can be clamped by a clamp device provided on a main shaft. The base end portion of the pipe is provided so as to be separable from the boring bar main body,
The boring bar device according to claim 2, wherein a coupler is provided between the proximal end portion of the pipe and the boring bar main body so as to be relatively movable along the axial direction of the main shaft.

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