JP2006297567A - Tool holder and rotary machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely practical tool holder and a rotary machining device with excellent productivity and excellent safety. <P>SOLUTION: This tool holder comprises a tool holding part 11 mounted to a rotary main shaft 3 of a rotary machining device 2 for rotating a tool 1 for operation, and holding the tool 1. The holder has an air turbine mechanism 4 for rotating the tool holding part 11, and an air supply path 7 for pressure-supplying air is installed to the air turbine mechanism 4. The air supply path 7 is configured to be communicated with a coolant supply path 6 installed to the rotary machining device 2 for supplying a coolant such as oil mist and cutting oil to a work. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tool holder and a rotary machine device.

  In a general rotary machine, a shank portion of a tool holder that holds a tool such as a drill or an end mill is mounted on a rotating spindle (spindle), and the tool holder is rotated by the rotation of the spindle and drilled with the tool. This is a configuration for performing the machining operation.

  In addition, in order to perform various machining operations, this rotary machine device holds different tools on a plurality of tool holders, and automatically replaces and attaches the plurality of tool holders to a spindle sequentially. Is configured to do.

  On the other hand, there is a limit to the rotational speed of the spindle of the rotary machine. Therefore, if you want to rotate the tool at a rotational speed (for example, 100,000 revolutions / minute) that exceeds the limit of the spindle (for example, 40,000 revolutions / minute), incorporate a motor or air turbine as a rotation mechanism in the tool holder. A configuration in which the tool is rotated by this motor or air turbine is employed.

  By the way, the conventional tool holder incorporating the above-described air turbine is configured such that air is supplied to the air turbine, and a hose for supplying air from the compressor is connected to an air introduction path formed in a side surface of the tool holder. Therefore, if this hose is obstructive and a tool holder with a built-in air turbine and a tool holder with a non-air turbine built-in are used together, the tool holder with a built-in air turbine is attached and detached. Each time, the hose must be attached and detached, which is troublesome and inferior in workability.

  Furthermore, in the unlikely event that the rotating spindle rotates due to a program error or malfunction (when the tool is rotated by an air turbine built in the tool holder, the rotating spindle is not normally rotated), it is externally attached to the tool holder. The air supply hose and the like may be damaged.

  The present invention solves the above-described problems, and can supply air to the air turbine without the need for an air supply hose. It can be easily and inexpensively attached to a machine tool, and when performing a rotary machining operation, the tool can be rotated at high speed by an air turbine, as well as an air turbine built-in type tool holder and a non-air turbine built-in type. To provide a highly practical tool holder and rotary machine device that can be operated continuously without the need to attach and detach the hose even when the tool holder is mixed, and is excellent in productivity and safety. Is.

  The gist of the present invention will be described with reference to the accompanying drawings.

  An air turbine mechanism that is equipped with a tool holder 11 that is mounted on a rotary spindle 3 of a rotary machine device 2 that rotates a tool 1 to perform work, and holds the tool 1, and that rotates the tool holder 11. This air turbine mechanism 4 is provided with an air supply path 7 for pumping air, and this air supply path 7 uses coolant such as oil mist or cutting oil provided in the rotary machine device 2 as a workpiece. The present invention relates to a tool holder that is configured to be connected to the coolant supply path 6 to be supplied.

  The tool holder according to claim 1, wherein a shank portion 8 that fits into a tapered hole 12 provided in the rotary main shaft 3 is provided at a base end portion, and the tool holding portion 11 is provided at a distal end portion. The air turbine mechanism 4 is provided between the shank portion 8 and the tool holding portion 11, the tip of the air supply path 7 is connected to the air turbine mechanism 4, and the base end of the air supply path 7 is the shank portion. Opening is made at the base end portion of the pull stud 10 provided at the base end 8, and the shank portion 8 is fitted into the taper hole 12 to form the coolant supply path 6 provided in the rotary main shaft 3. When the shank portion 8 is fitted into and fixed to the tapered hole 12 by pulling the pull stud 10 by pulling the tube 9, the opening end portion of the coolant supply passage 6 and the base end of the air supply passage 7. To be connected to each other Those of the tool holder, characterized.

  Further, in the tool holder according to claim 1, the air supply path 7 is provided inside the air turbine mechanism 4 for driving air for driving the air turbine mechanism 4. The present invention relates to a tool holder in which a lubricant such as oil mist supplied to a bearing portion is supplied.

  In addition, the rotary tool is a rotary machine device that is equipped with a tool holder 5 having a tool holder 11 that holds the tool 1 and rotates the tool 1 to rotate the tool 1. 1-3. The rotary machine apparatus which employ | adopted the tool holder of any one of 1-3.

  Since the present invention is configured as described above, air can be supplied to the air turbine without the need for an air supply hose. In addition, it is possible to rotate the tool at high speed by an air turbine when performing a rotary machining operation, and of course, a tool holder with a built-in air turbine and a tool holder with a non-air turbine built-in type Therefore, it is not necessary to attach and remove the hose one by one, and it is possible to perform continuous operation, and it becomes an extremely practical tool holder and rotating machine device that excels in productivity and safety.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  Air can be supplied to the air turbine mechanism 4 by connecting the air supply path 7 provided in the air turbine mechanism 4 to the existing coolant supply path 6 provided in the rotary machine device 2. There is no need to attach a hose, so that this hose does not get in the way, and the work of connecting the hose to the rotary machine device 2 can be omitted, and the hose can be easily attached. Therefore, the rotary machine device 2 to which the tool holder 5 is mounted can rotate the tool 1 at a high speed by the air turbine mechanism 4 and, of course, the air turbine built-in tool holder 5 and the non-air turbine built-in type. Even if the tool holder is mixed, it is not necessary to attach and detach the hose one by one, and it is excellent in productivity capable of continuous operation.

  Also, if the rotating spindle rotates due to a program error or malfunction, there has been a risk of damaging an externally supplied air supply hose, but in the present invention that does not require the hose, There is no such fear, and therefore the safety is excellent.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a rotary machine device in which a tool holder 5 having a tool holder 11 for holding a tool 1 is mounted on a rotary spindle 3 (spindle) and the tool 1 is rotated to perform the work. The body 5 includes an air turbine mechanism 4 that rotates the tool holding portion 11. The air turbine mechanism 4 is provided with an air supply path 7 that pumps air, and the air supply path 7 includes the rotary machine device. 2 employs a tool holder 5 configured to be connected to a coolant supply path 6 for supplying coolant such as oil mist or cutting oil provided to 2 to a workpiece.

  Each part will be specifically described.

  A shank portion 8 that fits into a tapered hole 12 provided in the rotary main shaft 3 is provided at the base end portion of the tool holder 5, and the tool holding portion 11 is provided at a tip portion of the tool holder 5, A known air turbine mechanism 4 is provided between the shank portion 8 and the tool holding portion 11, the tip of the air supply path 7 is connected to the air turbine mechanism 4, and the base end of the air supply path 7 is the shank portion. Opening is made at the base end portion of the pull stud 10 provided at the base end 8, and the shank portion 8 is fitted into the taper hole 12 to form the coolant supply path 6 provided in the rotary main shaft 3. When the shank portion 8 is fitted and fixed in the tapered hole 12 by pulling the pull stud 10 by pulling the cylinder 9, the opening end portion of the coolant supply passage 6 and the opening end portion of the air supply passage 7 are connected. It is configured to be installed.

  Specifically, a steel ball 13 is provided in a tapered hole 27 formed at the tip of the pulling cylinder 9 so as to protrude and retract, and the pulling cylinder 9 is advanced to the diameter-expanding portion 24 in the spindle, and this diameter expansion is performed. The base end diameter large portion 25 of the pull stud 10 is inserted into the distal end opening of the traction cylinder 9 located at the portion 24, and the steel ball 13 is immersed. It protrudes inwardly and engages with the base end diameter large portion 25 of the pull stud 10 to connect the pulling cylinder 9 and the pull stud 10.

  Further, in this embodiment, the base end diameter large portion 25 of the pull stud 10 is set to a diameter that substantially fits into the distal end opening of the pulling cylinder 9, and the pulling cylinder 9 and the pull stud 10 are connected. At this time, the coolant supply path 6 and the air supply path 7 are configured to be connected in a state where air does not leak as much as possible. Reference numeral 26 denotes an O-ring, and the leakage of the air is also prevented by this O-ring.

  In addition, the air supply path 7 of the present embodiment is formed by partially diverting the air introduction path 20 formed in the side surface of the conventional air turbine built-in type tool holder. Specifically, the air is formed by a straight hole 22 drilled in the pull stud 10 and a connection hole 23 drilled in the tool holder 5 so that the straight hole 22 communicates with the air introduction path 20. A supply path 7 is formed. Note that the opening end of the air introduction path 20 is closed by a closing body 21.

  Therefore, not only can the existing coolant supply path 6 provided in advance in the rotary machine 2 be diverted, but also a part of the air introduction path 20 can be diverted, so that the conventional (existing) air turbine built-in type tool holder can be used. The air supply path 7 can be formed simply by drilling the straight hole 22 and the connection hole 23 in the body.

  The air supply path 7 is supplied with driving air for driving the air turbine mechanism 4 and a lubricant such as oil mist supplied to a bearing portion provided inside the air turbine mechanism 4. The

  Specifically, an air supply device 14 that supplies driving air for driving the air turbine mechanism 4 is formed in the pulling cylinder 9 via an oil mist generator 15 that supplies oil mist as the lubricant. The coolant supply path 6 is connected to the base end of the coolant supply path 6. Reference numeral 16 is a hose through which air or the like passes, and 17 is a rotary joint that connects the hose 16 and the base end of the coolant supply path 6.

  The air supply device 14 includes a compressor (not shown) and a main shaft air blow control valve 18. The main shaft air blow control valve 18 is set to open and close in accordance with a machining program appropriately set in the NC device 19.

  Further, in the rotary machine device 2 of the present embodiment, a predetermined tool holder 5 is selected from a plurality of tool holders 5 held by a tool holder (not shown) according to the machining program, An attachment / detachment mechanism (not shown) for attaching / detaching the selected tool holder 5 to / from the taper hole 12 is provided. In this embodiment, the selected tool holder 5 performs different work for each tool holder 5. It is configured.

  The tool holding holder holds the air turbine built-in type tool holding body 5 and the air turbine non-built-in type tool holding body in a mixed state.

  Hereinafter, the operation of this embodiment will be described.

  A predetermined tool holder 5 is selected in accordance with the machining program, and the tool holder 5 is gripped by the attachment / detachment mechanism.

  When a non-air turbine built-in tool holder is selected, a pull stud of the tool holder is inserted into the traction cylinder 9 and the traction cylinder 9 is moved so that the shank portion of the tool holder is tapered. After the tool holder is mounted on the rotary spindle 3, the tool holder is rotated by rotating the rotary spindle 3, and the tool 1 is rotated by the tool holder to perform machining work. I do.

  When the air turbine built-in type tool holder 5 is selected, the pull stud 10 of the tool holder 5 is inserted into the traction cylinder 9 and the traction cylinder 9 is moved to move the shank portion of the tool holder 5. When the tool holder 5 is attached to the rotating spindle 3 and the opening 8 of the coolant supply path 6 provided in the moving cylinder 9 and the air provided in the tool holder 5 are fixed. The opening end of the supply path 7 is in communication with the coolant supply path 6 and the air supply path 7 so that air can be supplied to the air turbine mechanism 4, and the air turbine (not shown) is driven by this air. The tool 1 is rotated at a high speed to perform a machining operation (the spindle air blow control valve 18 is always open during the machining operation, and the rotating spindle 3 is not rotated).

  Accordingly, since the air supply route for driving the air turbine can be constructed simply by mounting the tool holder 5 on the rotating spindle 3, the air supply hose is externally attached to the side surface of the tool holder one by one as in the prior art. There is no need, and even if the air turbine built-in type tool holder 5 and the air turbine non-built-in type tool holder are mixed, it is not necessary to attach and detach the hose at the time of replacement. become.

  Since the present embodiment is configured as described above, by connecting (connecting) the air supply path 7 of the air turbine built-in type tool holder 5 to the existing coolant supply path 6 provided in the rotary machine device 2, Since it is possible to construct an air supply route from the compressor, there is no need to connect an air supply hose to the outside as in the prior art, and this hose does not get in the way and the hose is connected to the rotary machine 2. It can be omitted and it can be installed easily. Therefore, the rotary machine device 2 to which the tool holder 5 is mounted can rotate the tool 1 at a high speed by the air turbine mechanism 4 and, of course, the air turbine built-in tool holder 5 and the non-air turbine built-in type. Even if the tool holder is mixed, it is not necessary to attach and detach the hose one by one, and it is excellent in productivity capable of continuous operation.

  Also, if the rotating spindle rotates due to a program error or malfunction, there has been a risk of damaging an externally supplied air supply hose, but in the present invention that does not require the hose, There is no such fear, and therefore the safety is excellent.

  Moreover, since the existing coolant supply path 6 and the existing air turbine mechanism 4 of the rotary machine device 2 can be used, it is very easy to simply form the straight hole 22 and the connection hole 23 in the tool holder 5. In addition, the cost can be reduced.

  Further, since the coolant supply path 6 and the air supply path 7 can be connected only by mounting the tool holder 5 on the rotary spindle 3, continuous operation of an ATC (auto tool changer) is not required. Is not disturbed.

  Furthermore, since air leakage from the connecting portion (communication portion) between the coolant supply path 6 and the air supply path 7 is prevented as much as possible, the air turbine can be driven more efficiently.

  In addition, since oil mist can be supplied to the bearing portion of the tool holder, it is possible to maintain good sliding of the bearing portion, and precise continuous high-speed rotation is possible.

  Therefore, in this embodiment, when the rotary machining operation is performed, the tool can be rotated at high speed by the air turbine, and the tool holder with a built-in air turbine and the tool holder with a non-air turbine built-in are mixed. Even if this is done, it is not necessary to attach and detach the hose one by one, and continuous operation is possible, resulting in an extremely practical rotary machine device that is excellent in productivity and safety.

It is a schematic explanatory drawing of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool 2 Rotating machine 3 Rotation main shaft 4 Air turbine mechanism 5 Tool holder 6 Coolant supply path 7 Air supply path 8 Shank part 9 Pulling cylinder
10 Pull stud
11 Tool holder
12 Taper hole

Claims (4)

  A tool holder that includes a tool holder that is mounted on a rotary spindle of a rotary machine that rotates a tool to hold the tool and holds the tool, and has an air turbine mechanism that rotates the tool holder. The turbine mechanism is provided with an air supply path for pressure-feeding air, and this air supply path is connected to a coolant supply path for supplying coolant such as oil mist and cutting oil provided in the rotary machine to the workpiece. It is comprised in the tool holder characterized by the above-mentioned.   The tool holder according to claim 1, wherein a shank portion that fits into a taper hole provided in the rotation main shaft is provided at a base end portion, and the tool holding portion is provided at a distal end portion. The air turbine mechanism is provided between the holding portion, the tip of the air supply path is connected to the air turbine mechanism, and the base end of the air supply path is the base end of the pull stud provided at the base end of the shank portion. The shank portion is opened at the portion, the shank portion is fitted into the tapered hole, the pulling stud is moved by moving the pulling cylinder that forms the coolant supply path provided on the rotating main shaft, and the shank portion is tapered. A tool holder configured to connect an opening end portion of a coolant supply path and an opening end portion of a base end of an air supply path in a continuous manner when fitted and fixed to each other.   The tool holder according to any one of claims 1 and 2, wherein the air supply path is supplied to driving air for driving the air turbine mechanism and a bearing portion provided inside the air turbine mechanism. A tool holder that is supplied with a lubricant such as oil mist. A rotary machine device that performs a work by mounting a tool holder having a tool holding part for holding a tool on a rotary spindle and rotating the tool, wherein the tool holder is any one of claims 1 to 3. A rotary machine device using the described tool holder.

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