JPH0731252U - Fluid supply device for tool holder - Google Patents

Abstract

(57) [Abstract] [Purpose] A tool holder for a tool holder that can supply cutting fluid from inside and outside the tool 24, both during machining, and can also easily supply and stop cutting fluid from outside the tool. A fluid supply device is provided. [Structure] The holder body 1 mounted on the rotating shaft 25 is fitted into a non-rotating housing 6 mounted on a non-rotating member 26 arranged on the outer peripheral side of the rotating shaft 25, and from the non-rotating member 26 side,
The cutting fluid is internally supplied through the fluid passage 14 formed in the housing 6 and the holder main body 1 and the fluid supply hole 24c of the tool 24 attached to the holder main body 1, and the fluid passage 1
An operation valve mechanism 32 that can be operated externally is provided in the branch passage 17 communicating with 4. The cutting fluid is externally supplied from the housing 6 to the blade portion 24b of the tool 24 only when the operation valve mechanism 32 is opened, and the holder body 1 is supplied with the cutting fluid. Install a tool without fluid supply holes to stop the internal supply of cutting fluid.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is provided in a tool holder that is attached to a rotary shaft such as a spindle provided in a machine tool such as a machining center, and a fluid such as cutting fluid is projected by the front part protruding from the tool holder and the tool edge part. The present invention relates to a fluid supply device that supplies a processing part and a processing part.

[0002]

[Prior art]

 The applicant of the present invention has previously proposed a fluid supply device for a tool holder in Japanese Patent Application No. 4-76290 (filed on November 5, 1992). This fluid supply device has a holder main body that is detachably attached to the rotary shaft of the machine tool, and a tool mounting hole is provided in the front part of the holder main body that projects forward of the rotary shaft. In a tool holder in which the holder body is rotatably fitted in a housing (holder case) that is engaged and held by a non-rotating member provided on the side of A front end for supplying fluid toward the front of the housing is projected, and a fluid passage for sending fluid from the non-rotating member side to the external nozzle is formed inside the housing and the holder main body. The rear ends of the holes are communicated.

The fluid supply device for a tool holder having the above-described configuration provides a fluid such as cutting fluid from a non-rotating member side such as a spindle head of a machine tool through a fluid passage to provide the fluid in a housing. It is discharged from the front end of the external nozzle toward the center of the front of the holder body, and is externally supplied to the outer periphery of the front part of the tool that projects toward the front of the holder. At the same time, by connecting the fluid passage to the rear end of the tool mounting hole provided in the holder body, a fluid such as cutting fluid is fitted into the tool mounting hole through the rear end of the tool mounting hole. If a fluid supply hole is formed in the fixed tool, the fluid sent to this fluid supply hole is discharged from the front end of the tool where the front end of the fluid supply hole is opened and supplied internally to the front of the tool. Guided into the workpiece hole being machined by the part. With these, fluid such as cutting fluid can be supplied from both outside and inside of the tool front part protruding from the holder, and the front part of the tool and the machining part of the workpiece can be sufficiently cooled.

[0004]

[Problems to be solved by the device]

 However, in the fluid supply device for the tool holder previously proposed by the applicant of the present invention, it is troublesome to supply the fluid internally only through the fluid supply hole formed in the tool that is detachably fitted and fixed in the mounting hole of the tool holder. Therefore, supplying the fluid internally from the fluid supply hole and externally supplying the fluid from the external nozzle may result in wasting one fluid or reducing the pressure of the fluid such as the cutting fluid to be supplied. There was a problem.

The present invention solves the above-mentioned problems and enables the internal and external supply of the fluid from the fluid supply hole and the housing of the tool and the supply from only one of them, and stops the external supply. Provided is a fluid supply device for a tool holder, which can easily switch the supply of fluid only from the fluid supply hole of the tool and the combined use of the internal supply and the external supply by an operation from outside the holder. That is the purpose.

[0006]

[Means for Solving the Problems]

 This invention has a holder main body that is detachably attached to the rotary shaft of a machine tool, and has a tool mounting hole at the front of the holder main body to engage and hold a non-rotating member on the outer peripheral side of the rotary shaft of the machine tool. In a fluid supply device for a tool holder in which the holder main body is rotatably fitted in a housing, a fluid passage for sending a fluid from the non-rotating member side to the rear end portion of the tool attachment hole is formed in the housing and the holder main body. A branch passage that is formed inside and communicates with the fluid passage is formed inside the housing, and a fluid supply passage that supplies fluid to a plurality of locations on the outer periphery of the front portion of the tool that is detachably fitted and fixed in the tool mounting hole is provided. The operation valve mechanism for opening and closing the branch passage is provided in the housing so as to be communicated with the branch passage.

[0007]

With the fluid supply device for the tool holder according to the present invention, when the operation valve mechanism for opening and closing the branch passage is opened, the fluid such as cutting fluid is passed through the fluid passage, the branch passage, and the fluid supply passage to the holder main body. Can be externally supplied to the outer periphery of the front part of the tool installed in the tool mounting hole of, and if the tool has a fluid supply hole, the fluid is passed through the fluid passage, the tool mounting hole, and the fluid supply hole, and the tip of the tool Part can be internally supplied to the machining part of the workpiece by the tool, and if the tool is not provided with the fluid supply hole, the fluid can not be internally supplied but only the external supply.

Further, when the operation valve mechanism is closed, a fluid such as a cutting fluid is not externally supplied, and a workpiece is machined by a tool through a fluid passage, a tool mounting hole, and a fluid supply hole formed in the tool. It is only possible to supply the parts internally. Then, by opening and closing one operation valve mechanism by an operation from the outside of the tool holder, it is possible to supply or stop the external supply of the fluid.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a holder main body of a tool holder. The holder main body 1 is provided with a grip portion 3 for automatic tool change in front of a tapered shank portion 2 and a front portion 4 in front of the grip portion 3. The tool mounting hole 5 is formed, and the front end of the tool mounting hole 5 is opened in the front end surface of the holder body 1.

A housing 6 of the tool holder is rotatably fitted and held on the front part of the holder body 1 via front and rear bearings 7. The housing 6 is restrained in the front-rear direction with respect to the holder body 1. The front end is located behind the front end of the holder body 1.

In the housing 6, a liquid supply plate 8 is fixed to a front end surface of a housing body 6a, a guide cylinder 9 extending in the front-rear direction is fixed to a lower portion of the housing main body 6a, and a clutch member is provided to a rear portion of the housing main body 6a. Ten are arranged. The lower part of the clutch member 10 is fitted to the rear part of the guide cylinder 9 protruding rearward of the housing main body 6a so as to be movable in the front-rear direction, and is urged rearward by an outer spring 11 provided between the housing main body 6a and the guide cylinder 9. Has been done. The upper portion of the clutch member 10 is supported on the front side of the grip portion 3 of the holder body 1 via a ring 13, and is fitted to the positioning pin 12 protruding rearward of the housing body 6a so as to be movable in the front-rear direction. Further, the clutch pin 13a fixed to the holder main body 1 via the ring 13 is configured to engage with the notch 10a formed in the upper end of the clutch member 10.

A fluid introduction hole 9a is opened at the rear end surface of the guide cylinder 9, and a fluid passage 14 having the introduction hole 9a as an upstream end is formed inside the guide cylinder 9, the housing main body 6a, and the holder body 1. The fluid passage 14 is configured to connect a positioning block 15 on the machine tool side, which will be described later, and a rear end portion of the tool mounting hole 5 of the holder body 1. An annular groove 17a is formed on the inner peripheral surface of the housing main body 6a, and the fluid passage 17 is always connected to the internal portion of the housing main body 6a and the internal portion of the holder body 1. A spherical valve 31 that opens and closes the introduction hole 9a and an inner spring 16 that biases the spherical valve 31 in the closing direction are provided in the guide cylinder 9.

The fluid passage 14 is communicated with the rear end of the tool mounting hole 5 from the guide cylinder 9 through the inside of the housing main body 6 a and the holder main body 1, and is formed in the lower portion of the housing main body 6 a along the axial direction thereof. The rear end of one of the branched passages 17 communicates with each other, and the front end of the branch passage 17 communicates with the rear end of the fluid supply passage 18. The fluid supply path 18 includes an arc-shaped rear portion 18a centered on the tool mounting hole 5 and a lower flow passage 18c extending below the rear portion 18a between the front end surface of the housing main body 6a and the rear end surface of the liquid supply plate 8. And is connected to six front portions 18b that are formed through the liquid supply plate 8 in the axial direction, and the front portions 18b are located at four locations in a circumferential direction that is concentric with the axis of the holder body 1 and its tool mounting hole 5. And are arranged at two places below in the direction orthogonal to the axis.

As shown in detail in FIG. 3, the oil supply bushes 19 are fitted and fixed to the front portion 18b of the fluid supply passage 18, and the oil supply bushes 19 rotate with a required resistance. 20 is rotatably held, and the liquid supply ball 20 is formed with an ejection hole 20a penetrating therethrough.

A ball valve 21 for opening and closing the branch passage 17 and a valve spring 22 for urging the ball valve 21 forward are built in the branch passage 17, and the ball valve 21 is provided at a front end portion of the branch passage 17. Further, an opening / closing operation screw 23 is screwed into the liquid supply plate 8 supported by the valve seat portion 17a, and an operation valve mechanism 32 for opening / closing the branch passage 17 is provided in the housing 6. The head 23a of the opening / closing operation screw 23 is arranged on the front side of the liquid supply plate 8 and the leg 23b extends rearward. The leg 23b is inserted into the branch passage 17 with a gap, and the rear end thereof is the ball valve 21. Is abutted against.

Then, the shank 24 a of the tool 24, which is a drill, is fitted into the tool mounting hole 5, and the clamp bolt 35 is screwed into the front end portion of the holder body 1 protruding forward of the housing 6, and the tool bolt is used by these bolts 25. 24 shanks 24a are detachably fixed to the holder body 1. The tool 24 is provided with a fluid supply hole 24c which is opened at the rear end face thereof, is branched into a plurality of pieces, and is provided with an injection port 24d at the tip of the blade portion 24b.

Further, in FIG. 2, 25 is a rotary shaft such as a spindle provided in a numerical control type machine tool such as a machining center, 26 is a non-rotating member such as a spindle head in which the rotary shaft 25 is fitted, The positioning block 15 is fixed to the lower surface of the front end of the non-rotating member 26, and the rear chamber 27 provided in the block 15 has a fluid supply source (not shown) provided in an appropriate place and a flexible hose 28. A push rod 30 fixed to the rear chamber 27 is projected into a cylindrical positioning portion 29 that communicates with the rear chamber 27 via a flow path.

Next, the operation of the fluid supply device for the tool holder according to the above-described embodiment will be described. The shank 24a of the tool 24 is fitted and fixed in advance in the tool mounting hole 5 provided in the holder body 1 of the tool holder. In this state, the grip part 3 of the holder body 1 is gripped by the automatic tool changer (not shown) provided on the machine tool, and the tapered shank portion 2 of the holder body 1 is attached to the front end of the rotary shaft 25 of the machine tool. It fits in the taper hole 25a provided.

Subsequently, the taper shank of the holder main body 1 is operated by the automatic attachment / detachment mechanism by operating the automatic attachment / detachment mechanism (not shown) provided at the back of the taper hole 25a of the rotary shaft 25 and the automatic tool changer. The pull stud bolt provided on the portion 2 is gripped, the shank portion 2 is pulled to a predetermined position, and the guide tube 9 provided on the housing 6 is pulled to a predetermined position.

When the guide cylinder 9 is pulled in as described above, the spherical valve 31 in the guide cylinder 9 is moved by the push rod 30 fixed to the positioning block 15 to the front side against the spring force of the inner spring 16 to open, The rear chamber 27 of the positioning block 15 communicates with the introduction hole 9a provided in the rear end surface of the guide cylinder 9, that is, the upstream end of the fluid passage 14. At the same time, the clutch member 10 is pressed against the front end surface of the positioning block 15, moves forward against the spring force of the outer spring 11, and the notch portion 10 a provided at the upper end portion of the clutch member 10 and the holder body 1 are moved. The clutch pin 13a fixed through the mounting ring 13 is disengaged, and the holder body 1 becomes freely rotatable with respect to the housing 6.

In this state, the rotary shaft 25 is driven to rotate the holder body 1 and the tool 24 integrally. At this time, the housing 6 does not rotate because the rear end of the guide tube 9 is held by the positioning portion 29 of the positioning block 15. Subsequently, a flow path (not shown) that connects the positioning block 15 and the fluid supply source is opened, and the cutting fluid is pumped to the rear chamber 27 of the positioning block 15.

As shown in FIG. 4, the cutting fluid pressure-fed to the rear chamber 27 is in a state where the ball valve 21 of the operation valve mechanism 32 is open, and from the introduction hole 9 a of the guide cylinder 9 to the gas of the fluid passage 14. It is sent to the branch passage 17 through the id tube 9 and the portion inside the housing main body 6a, and further to the six front portions 18b of the branch passage 17 through the fluid supply passage 18 and the ejection of the liquid supply balls 20 provided therein. It is jetted from the hole 20a toward the center side of the holder body 1 in the diagonally forward direction.

At the same time, the cutting fluid enters the fluid supply hole 24 c of the tool 24 from the downstream side of the branch passage 17 of the fluid passage 14 through the portion inside the holder body 1 and the rear end portion of the tool mounting hole 5. It is sent and ejected to the outer peripheral side of the tool 24 obliquely from the injection port 24d opened at the front end of the tool 24.

In the above-described state, the rotary shaft 25 and the tool holder are advanced together with the non-rotating member 26 of the machine tool, and the blade portion 24b of the tool 24 is pressed against the workpiece to carry out drilling, while the front end of the tool 24 is being machined. Of the cutting edge 24b by the cutting fluid jetted from the jet port 24d of the nozzle section 24d by the cutting fluid jetted from the jet hole 20a of the feed ball 20 at the same time as being supplied internally to the front end of the blade section 24b and the machining part of the workpiece. External supply of the face and the back of the work piece cools the tool 24 and the work piece.

After the machining of the workpiece is completed, the rotary shaft 25 and the tool holder are retracted together with the non-rotating member 26, the blade portion 24b of the tool 24 is extracted from the workpiece, and the non-rotating member 26 is returned to the original position. The rotation of the rotary shaft 25 is stopped, and the supply of cutting fluid from the fluid supply source to the positioning block 15 is also stopped.

The rotating shaft 25 is held at a position where the clutch pin 13 a fixed to the holder body 1 via the ring 13 and the notch 10 a of the clutch member 10 provided in the housing 6 face each other, and the rotation shaft 25 of the holder body 1 is held. The rotation with respect to the housing 6 is restrained, the grip portion 3 is gripped by the automatic tool changer, the shank portion 2 of the holder body 1 is pulled out from the tapered hole 25a of the rotary shaft 25, and the guide tube 9 provided in the housing 6 is removed. The tool holder is pulled out from the positioning block 15, and the tool holder is returned to a predetermined position outside the rotary shaft 25 and the positioning block 15.

In this embodiment, before the tool holder is mounted on the rotary shaft 25, the rod 33 is inserted into the ejection hole 20a of the liquid supply ball 20 to roll the liquid supply ball 20, as shown in FIG. By previously changing the inclination angle of the ejection hole 20a with respect to the axial direction of the tool 24 and extracting the rod 33 from the ejection hole 20a, the cutting fluid ejected from the ejection hole 20a can be appropriately supplied to the required position.

Further, by independently rolling the six liquid supply balls 20, the inclination angles of the ejection holes 20a are made different from each other to cool the entire blade portion 24b of the tool 24 from the outer peripheral side, It is possible to favorably remove the cutting chips attached to the blade portion 24b.

In this embodiment, as shown in FIG. 5, with the ball 21 of the operation valve mechanism 32 open, the shank 34 a of the tool 34 having no fluid supply hole is attached to or detached from the tool mounting hole 5 of the holder body 1. When the same operation as the case of using the tool 24 having the fluid supply hole 24c described above is performed by fitting and fixing as much as possible, the cutting fluid is ejected only from the ejection hole 20a of the liquid supply ball 20, and the tool 34 Only external supply to the outer peripheral surface of the blade portion 34b can be performed.

Further, as shown in FIG. 6, the opening / closing operation screw 23 provided in the operation valve mechanism 32 is rotated from the front of the tool holder by using a screwdriver or the like, and the operation screw 23 is moved forward from the liquid supply plate 8. The ball valve 21 is moved forward by the spring force of the valve spring 22, is supported by the valve seat portion 17a, and the branch passage 17 is closed. In this state, when the shank 24a of the tool 24 having the fluid supply hole 24c is detachably fitted and fixed to the tool mounting hole 5 of the holder body 1 and the same operation as described above is performed, the fluid supply hole 24c The cutting fluid can be jetted only from the jetting port 24d of the above, and only the internal supply for cooling the front end portion of the blade portion 24b of the tool 24 and the processed portion of the workpiece can be performed.

When the cutting fluid is externally and internally supplied as shown in FIGS. 5 and 6, compared with the case where both the external supply and the internal supply are shown in FIG. 4, use of the cutting fluid is performed. Can be used in a small amount, and the jetting force of cutting fluid can be increased.

Further, the opening / closing operation screw 23 is moved in the direction of pushing backward from the liquid supply plate 8, and the leg portion 23 b of the opening / closing operation screw 23 causes the ball valve 21 to resist the spring force of the valve spring 22 and the valve seat portion 17 a. The cutting fluid can be jetted from the jet holes 20a of the liquid supply ball 20 by separating the space and opening the branch passage 17. Therefore, the external supply of the cutting fluid can be stopped or performed by a simple operation of advancing and retracting the single opening / closing operation screw 23.

In the present invention, the number and position of the liquid supply balls are not necessarily limited to those in the above-mentioned embodiment, and the number can be changed as appropriate, for example, the number can be changed to three, and the tool is not limited to a drill, but a reamer or the like. It can be changed as appropriate, the tool shank and mounting hole can be changed by tapering, and the operation valve mechanism for the branch passage is limited to one location if it can be operated from the outside of the tool holder. The fluid supply passage 18 formed continuously in the circumferential direction of the housing main body 6a without being formed is provided as a discontinuous fluid supply passage 18 at each of a plurality of positions, and the like, and can be appropriately changed.

The shank portion of the holder main body is not necessarily limited to the one provided with the pull-up bolt, and the tool mounting hole is not limited to the straight hole, but the tapered shank with the tool is not limited to the straight hole. May be fixed to the holder body by an appropriate means, and the tool is not limited to a drill, and a reamer or the like can be used.

[0035]

[Effect of device]

 As described above, the present invention has a holder main body that is detachably attached to the rotary shaft of a machine tool, has a tool mounting hole in the front of the holder main body, and is provided on the outer peripheral side of the rotary shaft of the machine tool. In a fluid supply device for a tool holder in which the holder body is rotatably fitted in a housing that is engaged with and held by a rotating member, a fluid passage for sending fluid from the non-rotating member side to the rear end of the tool mounting hole. Is formed inside the housing and the holder main body, a branch passage communicating with the fluid passage is formed inside the housing, and is flowed to a plurality of locations on the outer periphery of the front part of the tool that is detachably fitted and fixed in the tool mounting hole. Since the fluid supply path for supplying the body is communicated with the branch passage and the operation valve mechanism for opening and closing the branch passage is provided on the housing so as to be externally operated, the following effects can be obtained.

That is, in the tool holder fluid supply device according to the present invention, when the operation valve mechanism for opening and closing the branch flow path is opened, a fluid such as cutting fluid is passed through the fluid passage, the branch passage and the fluid supply passage, If the tool can be externally supplied to the outer periphery of the front of the tool installed in the tool mounting hole of the holder body, and the fluid supply hole is formed in the tool, the fluid will flow through the fluid passage, the tool mounting hole, and the fluid supply hole. It is possible to supply the fluid internally from the tip of the tool to the machining part of the workpiece by the tool, and if the fluid supply hole is not formed in the tool, the fluid can not be internally supplied but only the external supply.

Further, when the operation valve mechanism is closed, machining of a workpiece by a tool is performed without supplying a fluid such as cutting fluid to the outside through a fluid passage, a tool mounting hole and a fluid supply hole formed in the tool. It is only possible to supply the parts internally. Then, by opening and closing one operation valve mechanism by an operation from the outside of the tool holder, it is possible to supply or stop the external supply of the fluid.

Therefore, it is possible to easily switch between the internal supply and the external supply of the fluid such as the cutting fluid and the supply of both of them, and when only the internal supply and the external supply are performed, the supply of the fluid is wasted. It eliminates the need for a small amount and can be used to increase the fluid ejection force, and switching operations are simple.

[Brief description of drawings]

FIG. 1 is a front view showing a fluid supply device for a tool holder according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram showing a relationship between an oil supply bush, an oil supply ball, and a rod for changing the ejection holes of the cutting fluid of the tool holder shown in FIG.

FIG. 4 is an explanatory diagram of internal and external liquid supply states of the fluid supply apparatus shown in FIG.

5 is an explanatory diagram of an external liquid supply state of the fluid supply apparatus shown in FIG.

6 is an explanatory diagram of an internal liquid supply state of the fluid supply apparatus shown in FIG.

[Explanation of symbols]

 1 Tool holder holder body 2 Tapered shank portion 3 Grip portion 4 Front portion of holder body 5 Tool mounting hole 6 Housing 6a Housing main body 8 Liquid supply plate 9 Guide cylinder 10 Clutch member 11 Outer spring 12 Positioning pin 13 Mounting ring 13a Clutch pin 14 fluid passage 15 positioning block 16 inner spring 17 branch passage 17a valve seat portion 18 fluid supply passage 19 oil supply bush 20 liquid supply ball 20a ejection hole 21 ball valve 22 valve spring 23 opening / closing operation screw 24 tool 24a shank portion 24b blade portion 24c fluid Supply hole 24d Injection port 25 Rotating shaft 26 Non-rotating member 27 Rear chamber 29 Positioning part 30 Push rod 31 Spherical valve 32 Operation valve mechanism 34 Tool without fluid supply hole

Claims (1)

[Scope of utility model registration request] 1. A holder main body that is detachably attached to a rotary shaft of a machine tool, and a tool mounting hole is provided in a front portion of the holder main body to engage with a non-rotating member on the outer peripheral side of the rotary shaft of the machine tool. In a fluid supply device for a tool holder in which the holder body is rotatably fitted in a held housing, a fluid passage for sending fluid from the non-rotating member side to a rear end portion of the tool mounting hole is provided in the housing and the holder body. A fluid supply path for supplying fluid to a plurality of locations on the outer periphery of the front part of the tool, which is formed inside the housing and has a branch passage communicating with the fluid passage formed inside the housing and which is detachably fitted and fixed in the tool mounting hole. Is connected to the branch passage, and an operation valve mechanism for opening and closing the branch passage is provided on the housing so as to be externally operated.