JP5028158B2 - Cutting agent supply device for machine tools - Google Patents

Description

  The present invention relates to a cutting agent supply device for a machine tool configured to supply a mist-like cutting agent obtained by mixing cutting oil and compressed air toward a processing point of a tool.

When supplying a mist-like cutting agent, which is a mixture of cutting oil and compressed air, toward the machining point of the tool, the mist-like cutting agent becomes a droplet in the middle of the path and is discharged from the tool. There is a problem that the amount decreases. As a cutting agent supply apparatus that can solve this problem, there is a conventional one disclosed in Patent Document 1, for example. In this cutting agent supply apparatus, the mist supply pipe is provided so as to extend from the base end side of the draw bar to the front end side along the axis of the draw bar and in a non-rotating state, and the mist supply pipe is provided outside the base end side of the main shaft. Is supplied from the mist supply pipe to the tool through the flow passage of the tool gripping mechanism.
JP 2005-271177 A

  By the way, since the mist supply pipe is disposed in a non-rotating state with respect to the main shaft, it is likely to be worn by friction with the main shaft. Therefore, maintenance such as periodically replacing the mist supply pipe is necessary. In addition, the amount of the necessary cutting agent may differ depending on the type of tool, the content of cutting, and the like. In such a case, it may be necessary to replace it with one having a different hole diameter.

In the conventional apparatus, when the mist supply pipe is removed from or attached to the main shaft due to maintenance or replacement, the mist supply pipe is attached to or removed from the main shaft axis from the base end side of the main shaft. Become. However, many components such as an unlocking mechanism for moving the draw bar to unlock the tool and a mixing valve for supplying mist-like lubricating oil to the mist supply pipe are disposed on the base end side of the main shaft. Therefore, there is a concern that the maintenance workability of the mist supply pipe is low.

  This invention is made | formed in view of the said conventional condition, and makes it the subject to provide the cutting agent supply apparatus of the machine tool which can improve the maintenance workability | operativity of a mist supply pipe | tube.

The invention of claim 1 comprises a spindle head, a spindle supported rotatably by the spindle head, and a tool attached to a tapered tool attachment hole formed at the tip of the spindle. In a cutting agent supply device of a machine tool configured to supply a mist-like cutting agent obtained by mixing a compressed air and a compressed air toward a processing point of the tool,
A mixing valve for generating the mist-like cutting agent is disposed on the base end side of the main shaft, and a mist supply pipe is connected to the mixing valve. The mist supply pipe is connected to the tool side end of the main shaft. When extending from the bottom surface of the tool mounting hole of the main shaft through the shaft portion so as to protrude forward, when the tool is removed from the main shaft, the mist supply pipe is moved from the tool mounting hole side to the shaft center portion of the main shaft. It is characterized by being removable.

The invention of claim 2 is characterized in that, in claim 1, the mist supply pipe can be replaced with one having a different hole diameter in accordance with the supply amount of the cutting agent.

According to a third aspect of the present invention, in the first or second aspect, the mixing valve side end of the mist supply pipe is slidable in the axial direction and supported in a non-rotating state, and the tool side end of the mist supply pipe is supported. It is characterized in that slidably and rotatably supported in the axial direction by a bearing member arranged on the tool side end portion of the drawbar.

According to a fourth aspect of the present invention, in the third aspect, the mixing valve side end of the mist supply pipe is in a non-rotating state due to the frictional force of the seal member interposed between the mixing valve side end and the non-rotating member. It is characterized by being supported by.

According to the first aspect of the present invention, when the tool is removed from the main shaft, the mist supply pipe can be attached to and detached from the shaft center portion of the main shaft from the tool mounting portion side. Maintenance and replacement of the supply pipe are possible, and the workability such as maintenance can be greatly improved. Further, when the tool is removed, the tool side end of the mist supply pipe projects forward from the bottom surface of the tool mounting hole of the spindle, so that the tool side end can be easily gripped to hold the mist supply pipe. It can be pulled out or inserted, and from this point, workability such as maintenance of the mist supply pipe can be improved.

In the invention of claim 2, since the mist supply pipe can be replaced with one having a different hole diameter according to the amount of the cutting agent supplied, the mist supply pipe can be replaced with a mist supply pipe having an appropriate hole diameter by a simple operation. An appropriate amount of cutting agent can be supplied to the processing point.

In the invention of claim 3, the mixing valve side end of the mist supply pipe is supported in an axially slidable and non-rotating state, and the tool side end is slidable in the axial direction and relatively rotatable. Since it is supported, the relatively long mist supply pipe can be reliably supported in the non-rotating state in the main shaft that rotates at high speed.

In the invention of claim 4, the mixing valve side end of the mist supply pipe is supported in a non-rotating state by the frictional force of the seal member interposed between the mixing valve side end and the non-rotating member. The mist supply pipe can be supported in a non-rotating state, and the mist supply pipe can be attached to and detached from the axial center portion of the main shaft by pulling or pushing in the axial direction against the frictional force.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1-6 is a figure for demonstrating the cutting agent supply apparatus of the machine tool which concerns on one Embodiment of this invention.

  In the figure, reference numeral 1 denotes a spindle head of a machine tool. The main shaft head 1 has a cylindrical shape, and a main shaft 2 is inserted and disposed therein, and the main shaft 2 is rotatably supported via bearings 3a and 3b.

  A drive motor 4 is disposed between the spindle 2 and the spindle head 1. In addition, a tool mounting portion including a tapered tool mounting hole 2a is formed at the tip of the main shaft 2, and a tool 5 is fitted and mounted in the tool mounting hole 2a.

  Furthermore, an insertion hole 2b is formed in the axial center portion of the main shaft 2 so as to penetrate in the axial direction, and a draw bar 6 is inserted into the insertion hole 2b so as to be able to advance and retract. A large number of disc springs 7 are arranged between the insertion hole 2 b and the draw bar 6, and the draw bar 6 is urged by the disc spring 7 in a direction to lock the tool 5.

  An unlock mechanism 8 that moves the draw bar 6 in the unlocking direction when the tool 5 is removed from the main shaft 2 is disposed on the base end (rear end) side of the main shaft 2. Further, a cutting agent supply device 9 for supplying a mist-like cutting agent obtained by mixing compressed air into the lubricating oil toward a processing point is provided from the unlock mechanism 8 into the draw bar 6 and further into the tool 5. It is formed to cross.

  The tool 5 includes a rod-shaped holder portion 5a and a cutting tool 5b inserted and fixed to the axis of the holder portion 5a. A tapered fitting portion 5c that fits into the tool mounting hole 2a is formed at the base end portion (rear end portion) of the holder portion 5a. A lock hole 5d is formed inside the fitting portion 5c, and a locking step portion 5e is formed at the rear end of the lock hole 5d. Further, a mist introduction hole 5f is formed in the shaft center of the holder portion 5a so as to follow the lock hole 5d, and a tip portion of the mist introduction hole 5f is a mist nozzle formed in the shaft center of the blade 5b. It communicates with 5g. The mist nozzle 5g opens toward a processing point by the cutting tool 5b.

  A cylindrical drive member 10a is connected to the leading end of the draw bar 6, and a lock member 10b is disposed outside the drive member 10a so as to surround it. When the draw bar 6 is urged in the locking direction by the disc spring 7, the driving member 10a urges the locking member 10b in the locking direction, and the lock cam 10c of the locking member 10b is engaged with the locking step of the holder portion 5a. The holder 5a is urged in the locking direction by engaging with the portion 5e. As a result, the fitting portion 5 c of the tool 5 is fitted into the tool mounting hole 2 a of the main shaft 2, and as a result, the tool 5 is fixed to the tip portion of the main shaft 2.

  The unlocking mechanism 8 includes a cylindrical unlocking cylinder 11 disposed and fixed in the rear part of the spindle head 1 and an unlocking piston 12 that is inserted into a cylinder hole 11a of the unlocking cylinder 11 so as to be able to advance and retreat. And a lid member 13 for closing the rear end opening 11b of the cylinder hole 11a. A front end opening 11c of the cylinder hole 11a surrounds the rear end 6b of the draw bar 6, and a flange member 6c is attached to the rear end 6b. The front end face 12a of the unlocking piston 12 is opposed to the flange member 6c with a slight gap.

  An oil chamber a is formed by the rear end portions of the unlock cylinder 11 and the unlock piston 12 and the lid member 13. The oil chamber a is supplied with a hydraulic pressure a 'when unlocked. An oil chamber b is formed in the middle of the unlock cylinder 11 and the unlock piston 12. The oil chamber b is supplied with a hydraulic pressure b ′ at the time of returning to move the unlock piston 12 backward.

  The cutting agent supply device 9 includes a mist supply pipe 14 that is inserted in an insertion hole 6d formed in the axial center of the draw bar 6 so as to be able to advance and retreat, and a connection member 16 connected to the mist supply pipe 14. And a mixing valve 17 connected to the flange 16c of the connecting member 16. The flange 16c of the connection member 16 is fixed to the lid member 13 of the unlock mechanism 8, and is thus supported in a non-rotating state.

  The mist supply pipe 14 is composed of a straight pipe having a circular cross section, and a portion in the vicinity of the tool side end 14b can be relatively rotated by a tool side bearing member 6e disposed in the drive member 10a and is axially oriented. Is slidably supported. The tool side end 14b is supported by a slide bearing 5i so as to be relatively rotatable and slidable in the axial direction. The sliding bearing 5i is press-fitted into the rear end portion of the nozzle 5h that is press-fitted into the axial center portion of the holder portion 5a of the tool 5. The nozzle hole of the nozzle 5h is coaxial with the mist introduction hole 5f.

  The mixing valve side end 14 a of the mist supply pipe 14 is inserted into the connection hole 16 b of the connection member 16. A plurality (4 to 5 in this embodiment) of O-rings 18 are interposed between the connection hole 16b and the mixing valve side end 14a so as to be adjacent to each other. The O-ring 18 is made of metal and has a ring-shaped holding member 18a having a mist supply pipe insertion hole 18b and a ring arrangement step 18c, and a rubber ring arranged on the ring arrangement step 18c of the holding member 18a. It consists of a main body 18d.

  The holding member 18 a is press-fitted into the connection hole 16 b of the connection member 16, and is pressed in the axial direction by the lid 15 fixed to the distal end surface of the connection member 16. The ring body 18d is sandwiched between a pair of adjacent holding members 18a, 18a and the mixing valve side end portion 14a of the mist supply pipe 14. The mist supply pipe 14 is fixed to the connecting member 16 by the frictional force generated by the clamping, and therefore the mist supply pipe 14 does not rotate even when the draw bar 6 rotates. On the other hand, the mist supply pipe 14 can be pulled out in the axial direction against the frictional force of the O-ring 18 or can be inserted into the O-ring 18. Further, a portion of the mist supply pipe 14 between the tool side end portion 14b and the mixing valve side end portion 14a, that is, the axial center portion is supported by the central bearing member 21 so as to be relatively rotatable and slidable in the axial direction. Yes. The central bearing member 21 is composed of a plurality of (three in the present embodiment) bearing pipes 21 a, and one end of each bearing pipe 21 a is slightly larger than the outer diameter of the mist supply pipe 14. A sliding bearing portion 21b having a diameter is formed. The three bearing pipes 21a are sequentially inserted between the insertion hole 6d of the draw bar 6 and the mist supply pipe 14 with the flange member 6c screwed to the rear end of the draw bar 6 removed, and again. By screwing the flange member 6c, the mist supply pipe 14 is supported so as to be relatively rotatable and slidable in the axial direction.

  Here, the tool side end portion 14b of the mist supply pipe 14 is located in the tip end portion 10a 'of the drive member 10a and in the rear end portion of the nozzle 5h as described above, and therefore the tool 5 When removed, the main shaft 2 is positioned so as to be visible from the outside A on the tool mounting portion side.

  A mist supply hole 16a is formed in the axial center of the connecting member 16 on the mixing valve 17 side, and the front end of the mist supply hole 16a communicates with the opening on the mixing valve side of the mist supply pipe. The rear end portion of the mist supply hole 16 a communicates with the outlet of the mixing valve 17.

  In the spindle head 1 of the present embodiment, at the time of machining, the spindle 2 is rotationally driven by the motor 4, whereby the tool 5 is rotated and machining is performed by the cutting tool 5b. At the time of machining, the tool side end 14b of the mist supply pipe 14 of the cutting agent supply device 9 is supported by a slide bearing 5i in the nozzle 5h of the holder 5a so as to be relatively rotatable, and the front end opening thereof is interposed through the mist introduction hole 5f. The mist-like cutting agent generated by the mixing valve 17 is supplied to the processing point by the cutting tool 5b. In this case, the mixing valve side end portion 14a of the mist supply pipe 14 is supported by the connecting member 16 in a non-rotating state by the frictional force of the O-ring 18 and can be relatively rotated by the tool side bearing member 6e and the central bearing member 21. It is supported by.

  At the time of tool change, first, the hydraulic pressure a ′ is supplied to the oil chamber a. As a result, the unlock piston 12 moves forward to move the draw bar 6 forward, and the draw bar 6 moves the drive member 10a forward. Accordingly, the lock of the holder portion 5a by the lock member 10b is released. Subsequently, a tool changer (not shown) pulls out the tool 5 from the tool mounting hole 2a of the spindle 2 and mounts another tool in the tool mounting hole 2a.

  In this embodiment, the mist supply pipe 14 connected to the mixing valve 17 via the connecting member 16 is extended to the tool 5 side mounted on the main shaft 2, and the tool side end portion 14b of the mist supply pipe 14 is connected to the nozzle 5h. Since the mist nozzle 5g of the blade 5b is communicated with the mist introduction hole 5f of the holder portion 5a, the flow path diameter does not change from large to small, and since it is supported in a non-rotating state, the influence of centrifugal force is eliminated. be able to. Therefore, it is possible to prevent the mist-like cutting agent from becoming droplets in the middle of the path, and to avoid a reduction in the amount of mist discharged from the tool. As a result, the cutting agent can be reliably supplied to the processing point of the tool 5. . In addition, a mist-like cutting agent can be instantaneously supplied to the processing point after the tool change.

Furthermore, when changing the tool, the tool side end 14b of the mist supply pipe 14 is located in the front end of the drive member 10a and does not protrude outward, so that a tool changer or the like interferes with the mist supply pipe 14. Can be avoided, and damage to the mist supply pipe 14 can be reliably prevented.

On the other hand, when the tool 5 is removed from the tool mounting hole 2a of the main shaft 2, the tool side end portion 14b of the mist supply pipe 14 moves forward from the front end portion of the driving member 10a disposed on the tool mounting portion side of the front end portion of the main shaft 2. However, the tool-side end portion 14b can be easily and reliably gripped. Further, since the mist supply pipe 14 is slidable in the axial direction with respect to the tool side bearing member 6e, the central bearing member 21 and the O-ring 18 that support the mist supply pipe 14, the tool side end of the mist supply pipe 14 is supported. By grasping and pulling the portion 14b, the mist supply pipe 14 can be easily removed from the draw bar 6 and thus the main shaft 2, and can be easily mounted in the draw bar 6 by being pushed in.

Incidentally, when the mist supply pipe 14 is pulled out from the mixing valve 17 side, it is necessary to remove a large number of parts, and workability during replacement and maintenance of the mist supply pipe 14 is deteriorated.

  Further, since the mist supply pipe 14 can be easily attached and detached as described above, it can be replaced with a mist supply pipe having an appropriate hole diameter by a simple operation, and as a result, an appropriate amount of cutting agent can be supplied to the processing point.

Furthermore, since the tip opening of the tool side end portion 14b is located in the tip portion 10a 'of the drive member 10a protruding slightly forward from the front end of the tool mounting hole 2a, the cutting agent ejected from the tip opening. Is hardly attached to the taper surface of the tool mounting hole 2a, and the problem that the locking force of the tool 5 is reduced by the cutting agent does not occur.

  Further, the tool side end 14b of the mist supply pipe 14 is supported by the tool side bearing member 6e so as to be axially slidable and relatively rotatable, and the mixing valve side end 14a is O-ring in the connecting member 16. Since it is supported in a non-rotating state and slidable in the axial direction by the frictional force of 18, the mist supply pipe 14 can be supported without hindering the rotation of the main shaft during processing.

  A portion between the tool side end portion 14b and the mixing valve side end portion 14a of the mist supply pipe 14 is slidable in the axial direction by a central bearing member 21 inserted and arranged in the axial center portion of the draw bar 6 and Since it supported so that relative rotation was possible, while making the mist supply pipe | tube 14 long, it can support without trouble and can be attached or detached.

  The connecting member 16 is disposed in the cylinder hole 12b formed in the unlocking piston 12 of the unlocking mechanism 8 disposed on the base end side of the main shaft 2, and the mixing valve 17 is connected to the connecting member 16. Therefore, the mist supply pipe 14 can be arranged in a non-rotating state and slidable in the axial direction using the internal space of the unlock mechanism 8, and the cutting agent supply device 9 can be configured compactly.

  In the above embodiment, the case where the mist supply pipe 14 is supported in the non-rotating state has been described. However, the present invention is also applicable to the case where the mist supply pipe is supported in the rotating state.

Further, the specific position of the tool side end portion 14b of the mist supply pipe 14 is not limited to the above-described embodiment. In short, the mist supply pipe 14 can be attached and detached when the tool is removed, and the mist supply pipe 14 can be replaced when the tool is changed. What is necessary is just to position in the position which can avoid that the supply pipe | tube 14 interferes with a tool change apparatus. In this case, the detachability can be improved as the tool side end portion 14b of the mist supply pipe 14 protrudes forward, and damage to the mist supply pipe 14 can be surely avoided as the tool is inserted inward.

It is a side view of the spindle head provided with the cutting agent supply apparatus which concerns on one Embodiment of this invention. It is a cross-sectional side view of the tool side part at the time of the process of the said spindle head. It is a cross-sectional side view of the mixing valve side part at the time of processing of the spindle head. It is a cross-sectional side view of the tool side part at the time of the tool removal of the said spindle head. It is a cross-sectional side view of the bearing member in the said cutting agent supply apparatus. It is a cross-sectional side view of the O-ring part for fixing the mist supply pipe | tube in the said cutting agent supply apparatus.

Explanation of symbols

1 Spindle head 2 Spindle 2a Tool mounting hole (tool mounting part)
5 Tool 9 Cutting Agent Supply Device 14 Mist Supply Pipe 14a Mixing Valve Side End 14b Tool Side End 16 Connection Member (Non-Rotating Member)
17 Mixing valve 18 O-ring (seal member)

Claims (4)

A spindle head, a spindle supported rotatably by the spindle head, and a tool attached to a tapered tool attachment hole formed at the tip of the spindle, and mixed with cutting oil and compressed air In a cutting agent supply device for a machine tool configured to supply a mist-shaped cutting agent to a machining point of the tool,
A mixing valve that generates the mist-like cutting agent is disposed on the base end side of the main shaft, and a mist supply pipe is connected to the mixing valve.
The mist supply pipe is extended so that the tool side end portion protrudes forward from the bottom surface of the tool attachment hole of the spindle through the axial center of the spindle , and the mist supply pipe is removed when the tool is removed from the spindle. A cutting agent supply device for a machine tool , wherein the tube is attachable to and detachable from the tool attachment hole side with respect to the axial center portion of the spindle. The cutting agent supply device for a machine tool according to claim 1, wherein the mist supply pipe can be replaced with one having a different hole diameter in accordance with a supply amount of the cutting agent. 3. The mixing valve side end of the mist supply pipe is supported in an axially slidable and non-rotating state in claim 1, and the tool side end of the mist supply pipe is placed in the tool side end of the draw bar. A cutting agent supply device for a machine tool, which is supported so as to be slidable in an axial direction and capable of relative rotation by a bearing member disposed on the machine tool. 4. The mixing valve side end of the mist supply pipe is supported in a non-rotating state by a frictional force of a seal member interposed between the mixing valve side end and the non-rotating member. A cutting agent supply device for machine tools.

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