JP5313615B2 - Tool holder, tool holder mounting cooling turbine and machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool holder which is inexpensive, economical, compact, and free from any obstacle during the setup change of a workpiece, a cooling turbine for attaching the tool holder thereto, and a machine tool. <P>SOLUTION: The tool holder 40 attached to a rotating spindle comprises a tool holder body 41 attached to the spindle with a tool 45 being held on its fore end, and a cooling turbine 51 provided on the outer circumference of the tool holder body 41 to suck the outside air as the spindle 18 is rotated, and to eject the sucked outside air in the axial direction of the tool holder body 41 and toward the direction of the tool 45. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a tool holder that can cool a tool or a workpiece during machining, a cooling turbine for mounting a tool holder, and a machine tool.

Conventionally, in a machine tool such as a machining center, air, oil mist (oil mixed in the air), coolant liquid toward the machining position with the tool for cooling and lubrication during cutting Etc. are sprayed (refer patent document 1).
For example, a cooling device that blows air includes a nozzle, a compressor, and a pipe that guides air from the compressor to the cooling nozzle, and is arranged so that the tip of the nozzle faces a processing position by a tool.

JP 2003-117768 A

However, in the conventional cooling device, since it is necessary to use a driving source such as a compressor, power is consumed, the price is high, and there is a difficulty in increasing the size.
In addition, since the pipe for guiding the air from the compressor to the nozzle is disposed in the vicinity of the main shaft, it may become an obstacle when changing the work setup, or the discharge of chips may be hindered.

  The object of the present invention is to solve such problems, and is inexpensive and economical, and is small in size and does not interfere with workpiece setup, a cooling turbine for mounting a tool holder, and a work tool. To provide a machine.

The tool holder of the present invention is a tool holder that is mounted on a rotating spindle, and is provided on the outer periphery of the tool holder body that is mounted on the spindle and holds a tool at the tip thereof. A cooling turbine that sucks outside air and blows out the sucked outside air in the axial direction of the tool holder body and toward the tool direction, and the cooling turbine radiates from the outer periphery of the tool holder body and A plurality of blades that are curved in the rotation direction of the main shaft, and a guide tube portion that ejects outside air sucked by the plurality of blades in the axial direction of the tool holder body and in the tool direction. The plurality of blades are formed such that portions on the outside air suction side protrude in a radial direction from the guide tube portion, and the plurality of blades have outer dimensions. There are gradually decreased from the outside air suction side to the outside air ejection side, the reduction rate of the external dimensions, characterized in that gradually decreases from the outside air suction side to the outside air ejection side.
According to such a configuration, when the spindle rotates with the tool holder attached to the spindle, the tool holder body also rotates. Then, since the cooling turbine provided in the outer periphery of the tool holder main body is rotated, the outside air is sucked into the cooling turbine by the cooling turbine. The outside air sucked into the cooling turbine is ejected in the axial direction of the tool holder main body and in the direction of the tool, and as a result, the processing portion of the workpiece by the tool or the tool is cooled.
Therefore, since the cooling turbine provided on the outer periphery of the tool holder body cools the tool or the processing part of the workpiece by the tool, that is, it does not require a conventional driving source, it is inexpensive and economical. Further, it is possible to provide a tool holder that is small in size and does not get in the way when changing the workpiece setup.

In the tool holder of the present invention, the space between the front SL blade and the blade is formed to be gradually narrower toward the inner periphery from the outer periphery of the blade, it is preferable.
According to such a configuration, when the cooling turbine is rotated, outside air is sucked into the cooling turbine from between the plurality of blades. At this time, since the space between the blades is formed so as to be gradually narrowed, the outside air sucked into the cooling turbine is increased in speed while being directed toward the tool holder body in the axial direction and in the tool direction by the guide tube portion. Is ejected. Therefore, the cooling effect is high, and chips generated by the tool can be efficiently removed from the processing site of the tool.

In the tool holder of the present invention, it is preferable that the guide tube portion is constituted by a plurality of sleeve nozzles that are fitted inside and outside and are slidable in the axial direction of the tool holder body.
According to such a configuration, by sliding the sleeve nozzle in the axial direction of the tool holder body, the overall length of the guide tube portion, that is, the dimension in the axial direction of the tool holder body can be varied. Thus, depending on the tool length, by setting the optimum length of the entire length of the guide tube portion, cutting the efficient cooling effect originating volatilization.

A cooling turbine for mounting a tool holder according to the present invention is a cooling turbine for mounting a tool holder that is detachably mounted on the outer periphery of a tool holder having a tool at the tip, and is a fixed cylinder portion that is detachably mounted on the outer periphery of the tool holder. When a plurality of blades being curved to radially and the direction of rotation of the tool holder from the outer periphery of the fixed cylinder portion, and the outside air that has been sucked by the plurality of blades in the axial direction of the tool Hol da look including a guide tube portion for ejecting toward the tool direction, the plurality of blades, that portion of the outside air suction side is formed to protrude respectively in the radial direction from the guide tube portion, said plurality of blades, the each gradually decreases toward the outside air ejection side outer dimensions from the outside air suction side, the reduction rate of the external dimensions, characterized in that gradually decreases from the outside air suction side to the outside air ejection side To.
According to such a configuration, if the tool holder mounting cooling turbine is fixed to the outer periphery of the existing tool holder with an appropriate fixing means, for example, a bolt or an adhesive, and the tool holder in this state is mounted on the main shaft. As the main shaft rotates, outside air is sucked into the cooling turbine and then ejected in the axial direction of the tool holder body and in the direction of the tool. As a result, the processing portion of the workpiece by the tool or the tool is cooled. Therefore, even an existing tool holder can be configured as a tool holder that can be expected to have a cooling effect by simply fixing the tool holder mounting cooling turbine to the outer periphery of the tool holder later.

A machine tool according to the present invention includes the above-described tool holder, a rotatable main shaft on which the tool holder is mounted, and a relative movement mechanism that relatively moves the main shaft and a table on which a workpiece is placed. To do.
According to such a configuration, it is possible to provide a machine tool that can expect the above-described effects.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Description of machine tool body>
FIG. 1 is a front view showing an embodiment of a machine tool of the present invention.
The machine tool includes a machine tool main body 10, a control device 30 that drives and controls the machine tool main body 10 according to a machining program, and a tool holder 40 that is attached to the machine tool main body 10 and processes a workpiece W as a workpiece. Prepare.

  The machine tool main body 10 includes a base 11, a table 12 provided on the base 11 so as to be movable in the front-rear direction (X-axis direction), and a work 12 placed on the upper surface thereof, and a pair standing upright on both sides of the base 11. Columns 13A, 13B, a cross rail 14 spanned between the upper portions of both columns 13A, 13B, and a saddle 15 provided so as to be movable in the left-right direction (Y-axis direction) along the cross rail 14. The saddle 15 is provided with a turning saddle 16 that constitutes a tilting mechanism that can be turned around an A axis parallel to the X axis, and the turning saddle 16 is provided so as to be movable up and down (Z-axis direction). The ram 17 includes a ram 17, a main shaft 18 rotatably accommodated in the ram 17, and driving means 19 that rotationally drives the main shaft 18. The X axis, the Y axis, and the Z axis are orthogonal to each other.

  The base 11 is provided with an X-axis moving mechanism 21 that moves the table 12 in the X-axis direction, and the cross rail 14 is provided with a Y-axis moving mechanism 22 that moves the saddle 15 in the Y-axis direction. Is provided with a Z-axis moving mechanism 23 for moving the ram 17 in the Z-axis direction. The X-axis moving mechanism 21, the Y-axis moving mechanism 22, and the Z-axis moving mechanism 23 constitute a control axis. From these three control axes, the table 12 (work W) and the main shaft 18 are moved in a three-dimensional direction. A three-dimensional relative movement mechanism is provided for relative movement.

A tool storage device 25 and an ATC (automatic tool changer) 26 are provided on one column 13A side of the pair of columns 13A and 13B.
The tool storage device 25 stores different types of tool holders (tool holders having tools) 40. An ATC (automatic tool changer) 26 exchanges tools between the tool storage device 25 and the main shaft 18. For example, when the main shaft 18 is moved closer to the left end in FIG. 1 by driving the Y-axis moving mechanism 22, the tool holder 40 in use attached to the main shaft 18 and the tool holder 40 in the tool storage device 25. Replace automatically.
The control device 30 drives and controls the driving means 19, the X-axis moving mechanism 21, the Y-axis moving mechanism 22, and the Z-axis moving mechanism 23 according to a preset machining program.

<Description of tool holder>
FIG. 2 is a perspective view of the tool holder 40, and FIG. 3 is a cross-sectional view of the tool holder 40.
The tool holder 40 includes a tool holder main body 41, a tool 45 provided at the tip of the tool holder main body 41, and a tool holder mounting cooling turbine 51 detachably mounted on the outer periphery of the tool holder main body 41.
The tool holder body 41 has a tapered shank portion 42 as a main shaft mounting portion mounted on the main shaft 18 of the machine tool, and a disk shape that is formed integrally with the lower end of the tapered shank portion 42 and has the tapered shank portion 42 as the center. The formed flange portion 43 and a tool holding portion 44 that extends downward from the center of the flange portion 43 and holds the tool 45 at the tip.

As shown in FIGS. 4 and 5, the cooling turbine 51 is detachably attached to the outer periphery of the tool holder body 41, and a fixed cylinder portion 52 detachably attached to the outer periphery of the tool holding portion 44. A plurality of (six) blades 53 that are formed radially from the outer periphery of the fixed cylindrical portion 52 and curved in the rotational direction of the main shaft 18 and the outside air sucked by the blades 53 in the axial direction of the tool holder main body 41 and And a guide tube portion 54 ejected in the direction of the tool 45.
The fixed cylinder 52 includes a fitting cylinder 52A that is fitted to the outer periphery of the tool holding part 44, and a flange 52B that extends outward from the upper end of the fitting cylinder 52A.

The plurality of blades 53 are formed in an inverted conical shape such that the outer diameter dimension gradually decreases after being formed in the fixed cylinder portion 52 with a predetermined length substantially the same diameter as the flange 52B from the flange 52B toward the guide cylinder portion 54. In addition, the space between the blade 53 and the blade 53 is formed so as to gradually narrow from the outer periphery to the inner periphery of the blade 53.
The guide tube portion 54 is formed in a ring shape with a gap 55 between the lower end of the plurality of blades 53 and the fitting tube 52A of the fixed tube portion 52 with an annular shape.

<Processing>
When processing the workpiece W, a tool holder 40 having a tool 45 at the tip is attached to the main shaft 18. When the spindle 18 rotates in a state where the tool holder 40 is attached to the spindle 18, the tool holder body 41 is also rotated. Then, since the cooling turbine 51 provided on the outer periphery of the tool holder main body 41 is rotated, the outside air is sucked into the cooling turbine 51 by the cooling turbine 51.

At this time, since the space between the blades 53 is formed so as to be gradually narrowed, the outside air sucked into the cooling turbine 51 is increased in speed while being guided in the axial direction of the tool holder main body 41 by the guide tube portion 54. It is ejected toward the tool 45 direction. As a result, the tool 45 or the processing part of the workpiece W by the tool 45 is cooled.
Further, since the chips generated by the tool 45 are blown out by the outside air ejected from the gap 55 of the guide cylinder portion 54, the chips can be discharged efficiently.

Accordingly, the cooling turbine 51 provided on the outer periphery of the tool holder main body 41 cools the tool 45 or the processing portion of the workpiece W by the tool 45, that is, it does not require a conventional driving source, and is inexpensive. It is economical and small in size, and does not get in the way when changing the workpiece W.
In addition, the cooling effect is high, and chips and the like generated by the tool 45 can be efficiently removed from the processing portion of the tool 45.

  Further, if the tool holder mounting cooling turbine 51 is fixed to the outer periphery of the existing tool holder with an appropriate fixing means, for example, a bolt or an adhesive, and the tool holder 40 in this state is mounted on the main shaft 18, the main shaft 18. As a result of the outside air being sucked into the cooling turbine 51 as a result of the rotation of the tool 45, the tool 45 or the tool 45 is processed by the tool 45 or the tool 45. To be cooled. Therefore, even with an existing tool holder, a tool holder that can be expected to have a cooling effect can be configured simply by fixing the tool holder mounting cooling turbine 51 to the outer periphery of the tool holder later.

<Modification>
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the said embodiment, although the cooling turbine 51 was comprised with respect to the tool holder main body 41 so that attachment or detachment was possible, it is not restricted to this. For example, the cooling turbine 51 may be integrally formed on the outer periphery of the tool holder main body 41.

In the said embodiment, although the guide cylinder part 54 of the cooling turbine 51 was comprised by the single sleeve nozzle, it is not restricted to this. For example, as shown in FIG. 6, a plurality of sleeve nozzles 54 </ b> A, 54 </ b> B, 54 </ b> C that are fitted inside and outside and are slidable in the axial direction of the tool holder body may be used. The sleeve nozzle 54B is slidable with respect to the sleeve nozzle 54A, and the sleeve nozzle 54C is slidable with respect to the sleeve nozzle 54B, and can be fixed at an arbitrary position (for example, fixed with frictional resistance).
In this way, by sliding the sleeve nozzles 54 </ b> B and 54 </ b> C in the axial direction of the tool holder main body 41, the overall length of the guide tube portion 54, that is, the axial dimension of the tool holder main body 41 can be varied. Therefore, an efficient cooling effect can be exhibited by setting the overall length of the guide tube portion 54 to an optimum length according to the tool length.

In the above-described embodiment, the cooling turbine 51 includes the fixed cylinder portion 52, the plurality of (six) blades 53, and the guide cylinder portion 54, but is not limited thereto. For example, as long as the outside air sucked by the blade 53 can be ejected in the direction of the axis of the tool holder body 41 and in the direction of the tool 45, the guide tube portion 54 need not be provided. That is, only the fixed cylinder portion 52 and the blade 53 may be used.
In particular, in order to inject the outside air sucked by the blade 53 in the axial direction of the tool holder body 41 and in the direction of the tool 45, if the diameter of the fixed cylinder portion 52 is tapered to be gradually narrowed from the upper end toward the lower end, There is an advantage that the outside air can be converted in the axial direction of the tool holder body 41 and in the direction of the tool 45.

In the above-described embodiment, an example in which the main shaft 18 is applied to a machine tool in which the main shaft 18 rotates forward (clockwise rotation) has been described. However, in the case of application to a machine tool in which the main shaft 18 rotates in the reverse direction (counterclockwise rotation), the blade 53 What is necessary is just to form so that it may curve radially from the outer periphery of the fixed cylinder part 52 of this, and the rotation direction (counterclockwise direction) of the main shaft 18.
Furthermore, in order to apply to a machine tool in which the main shaft 18 rotates in the forward and reverse directions, a tool holder 40 for normal rotation and a tool holder 40 for reverse rotation are prepared in advance, and according to the rotation direction of the main shaft 18. The tool holder 40 may be selected.

  The X-axis moving mechanism 21 moves the table 12 in the X-axis direction, the Y-axis moving mechanism 22 moves the saddle 15 in the Y-axis direction, and the Z-axis moving mechanism 23 moves the ram 17 in the Z-axis direction. However, the present invention is not limited to this. For example, the X-axis moving mechanism 21, the Y-axis moving mechanism 22, and the Z-axis moving mechanism 23 may be any mechanism that relatively moves the table 12 and the main shaft 18 (tool holder 40) in the three-dimensional direction.

  INDUSTRIAL APPLICABILITY The present invention can be used for a tool holder that can cool a tool or a workpiece during machining, a cooling turbine for mounting a tool holder, a machine tool, and the like.

The front view which shows the machine tool which concerns on embodiment of this invention. The perspective view which shows the tool holder used in the said embodiment. Sectional drawing which shows the said tool holder. The perspective view which shows the cooling turbine with which the outer periphery of the said tool holder is mounted | worn. The cross-sectional view of the cooling turbine. Sectional drawing which shows the modification of the said tool holder.

Explanation of symbols

10 ... Machine tool body,
12 ... table,
18 ... Spindle,
19: Drive mechanism,
21 ... X-axis movement mechanism (control axis constituting a relative movement mechanism),
22 ... Y-axis moving mechanism (control axis constituting a relative moving mechanism),
23... Z-axis movement mechanism (control axis constituting a relative movement mechanism),
30 ... Control device,
40 ... Tool holder,
41 ... tool holder body,
51. Cooling turbine for mounting tool holder,
52 ... fixed cylinder part,
53 ... Blade,
54 ... guide tube,
54A, 54B, 54C ... Sleeve nozzle,
55 ... Gap,
W ... Work.

Claims (5)

A tool holder mounted on a rotating spindle,
A tool holder body mounted on the spindle and holding a tool at the tip;
A cooling turbine that is provided on the outer periphery of the tool holder body , sucks outside air as the main shaft rotates, and blows out the sucked outside air in the axial direction of the tool holder body and in the tool direction ;
The cooling turbine has a plurality of blades formed radially from the outer periphery of the tool holder body and curved in the rotation direction of the main shaft, and outside air sucked by the plurality of blades in the axial direction of the tool holder body. And a guide tube portion that ejects toward the tool direction,
The plurality of blades are formed such that portions on the outside air suction side protrude in the radial direction from the guide tube portion.
The plurality of blades have respective outer dimensions that gradually decrease from the outside air suction side toward the outside air ejection side, and a reduction rate of the outside dimension gradually decreases from the outside air suction side toward the outside air ejection side. Tool holder to be used. The tool holder according to claim 1, wherein
Tool holder, characterized in that it is formed so as gradually narrower as the space between the front SL blade and the blade is directed from the outer circumference to the inner circumference of the blade. The tool holder according to claim 2,
The tool holder is constituted by a plurality of sleeve nozzles fitted inside and outside and slidable in the axial direction of the tool holder body. A tool holder mounting cooling turbine that is detachably mounted on an outer periphery of a tool holder having a tool at a tip,
A fixed cylinder part detachably attached to the outer periphery of the tool holder;
A plurality of blades formed radially from the outer periphery of the fixed cylinder portion and curved in the rotation direction of the tool holder;
Look including a guide tube portion for ejecting the outside air sucked by the plurality of blades toward the tool Hol da and the tool direction in the axial direction,
The plurality of blades are formed such that portions on the outside air suction side protrude in a radial direction from the guide tube portion,
The outer dimensions of the plurality of blades gradually decrease from the outside air suction side toward the outside air ejection side, and the reduction rate of the outside dimension gradually decreases from the outside air suction side toward the outside air ejection side. Cooling turbine for tool holder mounting. The tool holder according to any one of claims 1 to 3,
A rotatable spindle equipped with this tool holder,
A machine tool comprising a relative movement mechanism for relatively moving the spindle and a table on which a workpiece is placed.

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