JP2002154032A - Tool holder and coolant supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder that can positively supply a coolant to all machining points without causing interference with a workpiece regardless of the dimensions and shape of a tool. SOLUTION: This rotating type tool holder 1 directly mounted to a spindle of a machine tool and having at least one cutting tool 3a fixed thereto, is provided with a cutting tool mounting part provided at the peripheral edge part of the tool holder to mount the cutting tool; a coolant nozzle 4 opened to the surface of the tool holder near the cutting tool mounting part and on the rotational center side of the tool holder rather than a cutting edge of the cutting tool; a supply port 2 provided at a rear end mounting face abutting on the spindle, in a position closer to the rotational center side of the tool holder than to the nozzle 4; and a coolant supply line 5 communicating from the supply port 2 to the nozzle 4, from the center side of the tool holder toward the outer periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder to which a cutting tool is attached in an apparatus for performing processing using a rotary tool.

[0002]

2. Description of the Related Art In general, a machine tool such as a machining center is provided with a nozzle and a hose at a head end of a spindle, and supplies coolant to a processing point by changing a direction of the nozzle and a hose in accordance with a size and a shape of a tool. I have.

Alternatively, a coolant is supplied to a processing point through a spindle through a method called spindle through coolant.

As another method, Japanese Utility Model Laid-Open No. 7-15241 has been proposed.
JP, JP-A-7-17452, JP-A-6-47
There is a method disclosed in Japanese Patent No. 647.

[0005]

However, in the above-mentioned method, even if the directions of the nozzle and the hose are changed according to the size and shape of the tool, the coolant is supplied to all the processing points due to interference with the workpiece. May not be possible. In addition, it takes time and effort to set the positions and orientations of the nozzles and hoses, and requires a space for attachment around the tool. Depending on interference with a workpiece, a jig, or the like, there is a case where the setting of the nozzle and the hose cannot be maintained in a desirable state.

When the tool is rotated at a high speed, the coolant is supplied from the outside of the tool. Therefore, the coolant is repelled by the rotation of the tool, or is hindered by the air current caused by the swirling of the air due to the rotation of the tool, so that the machining point is not reached. Reliable supply is difficult and cooling and lubrication may not be sufficient.

[0007] One of the methods for reliably supplying the coolant to the processing point and cooling is a method called a high-pressure coolant. This method not only requires a special device, but also requires a special device.
When the workpiece is thin, there is a problem that the workpiece is deformed by the pressure of the coolant.

In Japanese Unexamined Utility Model Publication No. Hei 7-15241, the direction of the oil hole with respect to the cutting tool is not specified, and it is not possible to obtain appropriate cooling conditions. In addition, since it is assumed that the spindle is used with the ATC and that the cutting tool is fixed to the holder with bolts, it is difficult to keep the balance of the rotating body in a good state, which is not suitable for high precision machining.

In Japanese Utility Model Laid-Open Publication No. 7-17452, there is a possibility that a collet or the like in a holder is immersed in a coolant and corroded. In addition, because of the structure in which the coolant is ejected toward the center of rotation of the tool, the supply of the coolant to the processing point becomes insufficient due to the centrifugal force caused by the rotation of the main shaft and the tool.

In Japanese Patent Application Laid-Open No. 6-47647, a special cutting fluid supply device is required, and since it is attached to the tip of the spindle during use, it is easy to interfere with a workpiece or a jig and a machining area is limited. And it is difficult to make full use of the inherent capabilities of the processing equipment.

Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide coolant to all machining points without causing interference with a workpiece regardless of the size and shape of a tool. It is to ensure that it can be supplied.

Another object of the present invention is to eliminate the trouble of setting the positions and orientations of nozzles and hoses.

It is still another object of the present invention to eliminate the need to attach a special device around a tool.

Still another object of the present invention is to prevent the coolant from being repelled by the rotating tool even at the time of high-speed rotation of the tool, and to prevent the coolant from flowing to the processing point without being hindered by the air current caused by the swirling of air caused by the rotation of the tool. This is to ensure reliable supply.

Still another object of the present invention is to provide a cooling, lubricating, and chip discharging function sufficiently.

Still another object of the present invention is to be able to cope with a high-pressure coolant, and to supply a sufficient coolant to a processing point without using a high-pressure coolant in some cases.

Still another object of the present invention is to supply a coolant from an appropriate direction to a cutting tool so that a sufficient cooling effect can be obtained.

Still another object of the present invention is to enable high-precision machining by high-speed rotation of a spindle and a tool while maintaining a good dynamic balance.

Still another object of the present invention is to eliminate the possibility of corrosion of a tool holder or the like.

[0020]

Means for Solving the Problems The above-mentioned problems are solved,
To achieve the object, the tool holder according to the invention is
A rotary tool holder that is directly attached to a main shaft of a machine tool and fixes at least one cutting tool, provided on a peripheral edge of the tool holder, and near a cutting tool mounting section for mounting the cutting tool; A coolant outlet opening on the surface of the tool holder closer to the center of rotation of the tool holder than the cutting edge of the cutting tool, and a mounting surface at a rear end abutting on the main shaft, the tool being located closer to the tool outlet. A supply port provided at a position near the rotation center of the holder, for supplying a coolant supplied from outside the tool holder, and from the supply port to the jet port from the center side of the tool holder toward the outer periphery. And a supply line for a coolant that communicates with the supply line.

Further, in the tool holder according to the present invention, the spout port is opened on a blade mounting surface of the blade mounting portion.

Further, in the tool holder according to the present invention, a plurality of the cutting tool mounting portions are provided, and at least one of the jet ports and at least one of the supply conduits are provided near each of the plurality of cutting tool mounting portions. It is characterized by being arranged.

Further, in the tool holder according to the present invention, the cutting tool mounting portion is arranged such that at least one of the ejection ports is located forward of the rake face of the cutting tool in the rotation direction of the tool holder. It is characterized by:

Further, in the tool holder according to the present invention, the cutting tool mounting portion is arranged such that the rake face of the cutting tool is located on an extension of the coolant jetting direction of at least one of the jet ports. And

Further, in the tool holder according to the present invention, at least one of the ejection ports is positioned rearward in the rotation direction of the tool holder from a flank of the cutting tool.
The cutting tool mounting portion is provided.

Further, in the tool holder according to the present invention, the ejection port is formed in a nozzle shape.

Further, in the tool holder according to the present invention, a plurality of the ejection ports and a plurality of the supply ports communicate with each other in a one-to-one correspondence.

Further, in the tool holder according to the present invention, all the ejection ports communicate with the same supply port.

Further, in the tool holder according to the present invention, the supply port is provided one-to-one corresponding to the plurality of cutting tool mounting portions, and the plurality of ejection ports for one cutting tool mounting portion are the same supply port. It is characterized by being connected to.

Further, in the tool holder according to the present invention, a plurality of the ejection ports are provided for one cutting tool mounting portion, and the ejection ports having the same radial position from the center of rotation of the tool holder are the same. The apparatus is characterized in that the apparatus is provided with the individual supply ports respectively communicating with the supply ports and corresponding to the jet ports at different radial positions.

Further, in the tool holder according to the present invention, the form of the supplied coolant is one of a liquid, a mist, and a gas, or a combination of two or more kinds.

Further, in the tool holder according to the present invention, the kind of the supplied coolant is any one of cutting oil, water, cold air, liquid nitrogen, and inert gas or a combination of two or more kinds. I have.

Further, in the tool holder according to the present invention, different coolant forms, coolant types, and combinations thereof are applied to each of the plurality of jet ports for each cutting tool.

The tool holder according to the present invention is directly attached to a main shaft of a machine tool, and is provided on a peripheral portion of the tool holder for fixing at least one cutting tool. Cutting tool mounting portion, a coolant outlet opening on the surface of the tool holder near the center of rotation of the tool holder, near the cutting tool mounting portion, and an outer peripheral surface of the tool holder Above, a supply port provided at a position closer to the rotation center of the tool holder than the ejection port, for supplying coolant supplied from outside the tool holder,
And a coolant supply pipe communicating from the supply port to the ejection port from the center side of the tool holder toward the outer peripheral direction.

Further, in the tool holder according to the present invention, the spout port is opened on a cutting tool mounting surface of the cutting tool mounting portion.

Further, in the tool holder according to the present invention, a plurality of the cutting tool mounting portions are provided, and at least one of the jet ports and at least one of the supply conduits are provided near each of the plurality of cutting tool mounting portions. It is characterized by being arranged.

Further, in the tool holder according to the present invention, the cutting tool mounting portion is arranged such that at least one of the ejection ports is located forward of the rake face of the cutting tool in the rotation direction of the tool holder. It is characterized by:

Further, in the tool holder according to the present invention, the cutting tool mounting portion is arranged such that the rake face of the cutting tool is located on an extension of the coolant jetting direction of at least one of the jet ports. And

Further, in the tool holder according to the present invention, at least one of the ejection ports is positioned rearward in the rotation direction of the tool holder from a flank of the cutting tool.
The cutting tool mounting portion is provided.

Further, in the tool holder according to the present invention, the ejection port is formed in a nozzle shape.

Further, in the tool holder according to the present invention, the plurality of ejection ports and the plurality of supply ports communicate with each other in a one-to-one correspondence.

Further, in the tool holder according to the present invention, all the ejection ports are connected to the same supply port.

Further, in the tool holder according to the present invention, the supply port is provided in one-to-one correspondence with a plurality of the blade mounting portions, and the plurality of ejection ports for one blade mounting portion are the same. It is characterized by being connected to.

Further, in the tool holder according to the present invention, a plurality of the ejection ports are provided for one cutting tool mounting portion, and the ejection ports having the same radial position from the rotation center of the tool holder are made to be the same. The apparatus is characterized in that the apparatus is provided with the individual supply ports respectively communicating with the supply ports and corresponding to the jet ports at different radial positions.

Further, the tool holder according to the present invention is characterized in that the form of the supplied coolant is a liquid, a mist, a gas or a state in which two or more kinds are combined.

Further, in the tool holder according to the present invention, the kind of coolant to be supplied is one of cutting oil, water, cold air, liquid nitrogen, and inert gas or a combination of two or more kinds. I have.

Further, in the tool holder according to the present invention, different coolant forms, coolant types, and combinations thereof are applied to each of the plurality of jet ports for each cutting tool.

Further, a coolant supply method according to the present invention is characterized in that coolant is supplied during machining using the tool holder.

[0049]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First, an outline of the embodiment will be described.

The present embodiment relates to a tool holder which is directly attached to the tip of a spindle of a processing apparatus, has a pipeline for supplying coolant to a cutting tool therein, and ensures the supply of coolant to a processing point. It is.

The tool holder is directly mounted on the main shaft and fixed. Coolant can be supplied from the center of the spindle using a spindle through mechanism. Coolant supplied from the center of the main shaft passes through a supply pipe extending toward the tool mounting portion, and is jetted from a jet port opened on the surface of the tool holder toward the cutting tool and the cutting edge. The jet port may be open to the cutting tool mounting surface, in which case a high cooling effect can be obtained for the cutting tool.

In addition to the spindle through method, the coolant can be supplied by an oil hole holder method or via a rotary joint. The coolant can be supplied not only in the axial direction of the main shaft but also in the direction perpendicular to the axis. It may pass through a supply path. When coolant is supplied through a supply path in a direction perpendicular to the axis, the main shaft and the tool holder are rotated by taking an arrangement in which the ejection port is located farther from the center of the tool holder than the supply port in the radial direction as in the present embodiment. The smooth supply of the coolant is possible by utilizing the centrifugal force, and the coolant can be surely supplied without the necessity of increasing the supply pressure of the coolant in accordance with the increase in the rotation speed as in the related art.

When the ejection port is opened for each cutting tool, the effects of cooling, lubrication, and chip discharge are high.

The opening position of the ejection port may be in the vicinity of the cutting tool, and may be located in front of the rake face, or may be located so that the ejection direction is toward the rake face, may be located behind the flank face, or may be in the ejection direction. It is effective to be located toward the surface.

The jet outlet not only opens to the surface of the tool holder but also has a nozzle-like tip, so that the jet pressure can be increased, and more effective coolant supply is possible.

By providing a plurality of ejection ports for one blade, it is more effective to supply to the processing point and cool the blade.

A supply port for supplying a coolant is provided to each of the ejection port and the supply pipe, and a coolant is individually supplied from a coolant supply source to thereby provide a state in which chips near each cutting tool being worked are clogged. As a result, a stable supply of coolant can be provided without being affected by each cutting tool, which is more effective.

A plurality of ejection ports are provided for each cutting tool, a supply port and a supply conduit are provided for each cutting tool, and the plurality of ejection ports for each cutting tool are communicated with one supply port for each cutting tool. If the coolant is supplied individually, it is possible to easily manufacture the tool holder.

A plurality of ejection ports are provided for each cutting tool, and supply pipes for ejection ports having the same radial position from the center of the tool holder communicate with the same supply port to correspond to each of the ejection port groups having different radial positions. A supply port is provided, and coolant is individually supplied to each supply port.Even if there is a difference in centrifugal force due to a difference in the radial position of a plurality of nozzles with respect to each cutting tool, individual nozzle groups with different radial positions are individually provided. Since the coolant is supplied to the nozzles, there is no interference between the nozzle groups having different radial positions, and the coolant can be supplied stably from each nozzle group. Further, by adjusting the supply pressure of the coolant to each of the ejection port groups according to the machining mode, it is possible to more effectively supply the coolant to the machining point.

The coolant to be supplied is in a state of liquid, mist, gas or a combination of two or more kinds, and the most suitable coolant form for the processing form is selected.
Irrespective of situations considered to be disadvantageous to the supply of coolant in the past, such as high-speed rotation of the spindle and the tool holder or chip discharge, the supply and arrival of the coolant to the cutting tool and the processing point are stable and reliable.

The type of coolant supplied is a cutting oil,
Any of water, cold air, liquid nitrogen, inert gas or 2
Combining more than one type, select the optimal coolant type for the machining mode, and regardless of the situation that is conventionally considered disadvantageous for coolant supply, such as high-speed rotation of the spindle and tool holder or chip removal, The supply and arrival of the coolant is stable and reliable.

By combining the above-mentioned form and the kind of the supplied coolant and selecting the optimum coolant supply for the processing form, the supply and arrival of the coolant to the cutting tool and the processing point can be stably and reliably performed.

By applying different coolant forms, coolant types, and combinations thereof to each of the plurality of ejection ports for each cutting tool, it is possible to more effectively supply coolant to the cutting tool and the processing point most suitable for the processing form. .

By adopting a coolant supply method for supplying coolant during machining with the tool holder having the above-mentioned features, the supply and arrival of the coolant to the cutting tool and the vicinity of the cutting tool become stable, so that reliable machining can be performed. it can.

Hereinafter, the embodiment will be described in detail.

(First Embodiment) FIG. 1 is a view showing a tool holder according to a first embodiment of the present invention.

FIG. 1A is a sectional view of a tool holder 1 of the present embodiment. The tool holder 1 has a supply port 2 for supplying a coolant from outside the tool holder. The supplied coolant 7 is ejected from the ejection port 4 to the vicinity of the cutting tool 3a through the supply conduit 5. Here, the supply port 2 coincides with the rotation center of the tool holder 1, but it is not always necessary to coincide with the rotation center. Tool holder 1
Coolant 7 is supplied to supply port 2 by centrifugal force with rotation of
Is supplied to the supply pipe 5 and is supplied from the ejection port 4 to the cutting tool 3.
It is ejected near a. Therefore, a supply device such as a pump that generates a high pressure in supplying the coolant 7 is not particularly required.

FIG. 1B is a view taken in the direction of arrows AA in FIG. 1A, and also shows a supply pipe in the tool holder for easy understanding. Spout 4 for easy understanding
An example is shown in which the supply conduit 5 is provided only for the cutting tool 3a and a cutting tool (not shown) in a direction opposite to the cutting tool 3a. The arrow 6 in the figure indicates the rotation direction of the spindle and the tool holder 1. The coolant 7 is quickly supplied to the cutting tools 3a, 3b, 3c by the centrifugal force acting with the rotation of the main shaft and the tool holder 1 and is jetted from the jet port 4, and is jetted by the generation of the airflow accompanying the rotation of the tool holder 1. The cooled coolant reaches the cutting tools 3a, 3b, 3c and the processing point without fail.

FIG. 13 is a view for explaining the state in which the tool holder of the present embodiment is attached to the main shaft in more detail.
FIG. 13A shows the embodiment of FIG. 1, and FIG.
In the embodiment, the tool holder is attached to the main shaft. Here, the present invention is applied to a spindle-through system in which a coolant 7 is supplied through the main shaft 6. Since the tool holder 1 is directly attached to the main shaft 6, the vicinity of the supply port 2 can be sealed by performing a simple treatment such as an O-ring, and no special coupling or joint is required. Therefore, there is no fear that the coolant 7 leaks, and no contamination or corrosion of the device by the coolant occurs.

The tool holder 1 is directly connected to the main spindle 6 as compared with a spindle capable of exchanging tools such as a general machining center.
Since there is no change in the mounting accuracy of the tool and the spindle due to tool change, the dynamic balance during rotation is not disrupted, and the vibration of the tool side is reduced, so the life of tools and cutting tools is extended and high-precision machining is possible It is.

Further, in recent years, a two-face constrained type tool shank has become widespread for high-speed machining. In this embodiment, however, a problem such as a decrease in tool gripping force does not occur by directly attaching the tool holder to the main spindle. . Also, since the coolant is supplied from the inside of the cutting tool, the centrifugal force and the air current act to make the coolant reach the cutting tool even at high speed rotation, and the coolant is supplied from the outer periphery of the conventional tool holder. Does not reach the machining point, and reliable supply of coolant to the machining point is possible.

Although the figure assumes a tool holder having six blades, the number of blades is not limited. In addition to the use of the tool holder according to the present embodiment, the coolant is supplied by the conventional method of supplying the coolant from the outer periphery of the tool holder. High effects can be obtained.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

In the present embodiment, the ejection port 4 communicating with the supply pipe line 5 is opened on the cutting tool mounting surface. FIG. 2A is a cross-sectional view of the tool holder according to the present embodiment, in which the ejection port 4 is opened at a position hidden by the cutting tool 3. FIG. 2B is a perspective view of the tool holder. Here, the spout 4 is hidden by the cutting tool 3 and is not shown. FIG. 2C shows the cutting tool 3 from FIG.
Is removed, the jet port 4 is positioned adjacent to the tap 6 for attaching and fixing the tool 3. Generally 3 tools
Does not have a uniform flat surface, so that the coolant can be sufficiently ejected only by opening the ejection port 4 on the mounting surface of the cutting tool 3. When the mounting surface of the blade 3 is flat, the coolant can be ejected by adding a groove or the like to the opening of the ejection port 4. Here, since the coolant jetted from the jet port 4 is directly applied to the cutting tool 3, higher cooling, lubrication and chip discharge effects can be expected.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

FIG. 3 is a cross-sectional view of the main shaft and the tool holder at a right angle to the axis. The supply port 2 is provided in the tool holder 1 and the cutting tools 3a to 3c.
d is provided with ejection ports 4a to 4d and supply pipes 5a to 5d, respectively, and the supply pipes 5a to 5d communicate with the same supply port 2.

As compared with the embodiment shown in FIGS. 1 and 2, the coolant is supplied to all the cutting tools and their machining points, so that higher cooling, lubrication and chip discharging effects can be obtained. Further, since the supply pipes are evenly arranged in the tool holder 1, not only the cutting tool and the processing point but also the tool holder itself are uniformly cooled, and the axial elongation due to heat generation from the main spindle side can be suppressed. , High-precision processing can be performed.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

The arrow in the figure indicates the rotation direction of the tool holder 1, and the ejection port 4a is located forward of the blade tools 3a to 3d in the rotation direction.
To 4d are arranged. As a result, the coolant can be supplied to the surface of the workpiece before the cutting tools 3a to 3d and the cutting tools 3a to 3d perform processing, and high effects can be obtained by cooling, lubrication, and chip discharge of the cutting tool and the processing point.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment. The ejection ports 4a to 4d are arranged such that the rake faces of the cutting tools 3a to 3d are positioned on the extension line in the ejection direction. This enables more effective cooling of the rake face of the cutting tool, and contributes to an improvement in the tool life and an improvement in the chip dischargeability.

(Sixth Embodiment) FIG. 6 shows a sixth embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

The arrow in the drawing indicates the rotation direction of the tool holder 1, and the ejection port 4a is positioned rearward in the rotation direction with respect to the cutting tools 3a to 3d.
To 4d are arranged. As a result, the coolant can be supplied to the surface of the workpiece after the cutting tools 3a to 3d and the cutting tools 3a to 3d perform the processing, and the cooling of the cutting tool and the processing point, the improvement of the lubrication and chip discharge performance, and the cooling of the processing surface by the cooling of the processing surface. Temperature rise can be further suppressed, and high-precision processing is possible.

(Seventh Embodiment) FIG. 7 shows a seventh embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

The ejection ports 4a to 4d are arranged so that the flank faces of the cutting tools 3a to 3d are located on the extension of the ejection direction. This enables more effective cooling of the flank of the cutting tool, which contributes to an improvement in the tool life and an improvement in chip evacuation.

(Eighth Embodiment) FIG. 8 shows an eighth embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

The ejection port 4 has a nozzle shape. Here, the nozzle-like shape of the nozzle 4 may be such that the hole at the opening on the surface of the tool holder 1 is smaller than the supply pipe line 5 and a throttle is formed inside the tool holder 1, as shown in the figure. Alternatively, a tool extending from the surface of the tool holder 1 to the vicinity of the cutting tool 3 may be used. As a result, the directivity of the jet of the coolant 7 is increased, and the coolant can be supplied to the cutting tool and the processing point accurately.

(Ninth Embodiment) FIG. 9 shows a ninth embodiment of the present invention.
It is a figure showing a tool holder concerning an embodiment.

Since the supply port 2 communicates with all the supply pipes, it is possible to easily process the tool holder when producing the tool holder.

(Tenth Embodiment) FIG. 10 is a view showing a tool holder according to a tenth embodiment of the present invention.

The coolants 7a and 7b pass through the conduits 8a and 8b provided outside the tool holder 1, and pass through the tool holder 1
From the supply ports 2a and 2b arranged on the outer periphery of the tool holder 1
The gas is supplied to the internal supply pipes 5a and 5b,
b toward the cutting tools 3a and 3b. Spout 4
Supply pipes 5a and 5b are respectively connected to a and 4b, and further communicate with the respective supply ports 2a and 2b. Further, the ejection ports 4a and 4b are located closer to the outer periphery than the supply ports 2a and 2b. Since the supply of the coolant is performed individually for each injection port, even if a trouble occurs in the piping of the supply system, the entire coolant supply system is a strong system that does not go down. Further, since the ejection port is located closer to the outer periphery than the supply port, the coolant can be supplied to the cutting tool and the processing point even if the supply pressure is not particularly high due to centrifugal force.

(Eleventh Embodiment) FIG. 11 is a view showing a tool holder according to an eleventh embodiment of the present invention.
Coolant is supplied from the outer periphery of the tool holder as in FIG. The coolants 7a and 7b are independently supplied into the tool holder 1 from supply ports 2a and 2b arranged on the outer periphery of the tool holder 1 through conduits 8a and 8b provided outside the tool holder 1. The coolants 7a, 7b supplied from the supply ports 2a, 2b pass through relay portions 6a, 6b independently installed in the tool holder 1, and from the relay portion 6a, the coolant of the tool holder 1 is supplied through supply pipes 5a1, 5a2. The nozzle 4a1 is opened at the end face near the blade 3a and the nozzle 4a2 is opened at the mounting surface of the blade 3a. From the relay section 6b, the cutting tool 3b is connected to the end face of the tool holder 1 through the supply pipes 5b1 and 5b2.
The nozzle 4b1 is opened in the vicinity and the nozzle 4b2 is opened in the mounting surface of the cutting tool 3b, and is jetted to the vicinity of the cutting tool 3b and its processing point.

In addition to the features of the embodiment described above, the supply of the coolant is performed individually for each blade, so that even if a trouble occurs in the piping of the supply system, the entire coolant supply system does not go down. It is a strong system. Furthermore, since the supply to each cutting tool is individual, it is easier to adjust than the embodiment shown in FIG. 9, and more effective coolant supply is possible. The independent conduits 8a and 8b for the coolants 7a and 7b can be provided in the spindle housing, or can be in the form of an attachment attached to the spindle head end face.

(Twelfth Embodiment) FIG. 12 is a view showing a tool holder according to a twelfth embodiment of the present invention.

As in FIG. 11, the coolant is supplied from the outer periphery of the tool holder. The coolants 7a and 7b are independently supplied into the tool holder 1 from supply ports 2a and 2b arranged on the outer periphery of the tool holder 1 through conduits 8a and 8b provided outside the tool holder 1. The coolants 7a, 7b supplied from the supply ports 2a, 2b pass through relay sections 9a, 9b, 10a, 10b independently installed by pipes 11a, 11b independently installed in the tool holder 1. It is supplied to the cutting tools 3a and 3b.

Here, the pipeline 11a is connected to the relays 9a and 9b,
The conduit 11b communicates with the relays 10a and 10b. As shown in FIG. 12 (b), the relay portions 9a and 9b are in communication with each other, and the spout 4 is opened at the end face of the tool holder 1 through the supply conduits 5a1 and 5b1 inwardly of the cutting tools 3a and 3b.
The coolant 7a can be supplied and jetted to the vicinity of the cutting tools 3a and 3b and the processing points thereof by communicating with the cutting tools a1 and 4b1.

As can be seen in FIG. 12B, the relay portions 10a and 10b are in communication with each other, and are outside the ejection ports 4a1 and 4b1 through the supply pipes 5a2 and 5b2.
4 that is open on the mounting surface of the blade tools 3a, 3b
The coolant 7b can be supplied and jetted to the vicinity of the cutting tools 3a and 3b and the processing points thereof by communicating with the cutting tools a2 and 4b2.

Since the ejection ports having the same radial position in the tool holder communicate with the same supply port, there is no difference in the supply pressure between the ejection ports, and there is no interference between the ejection port groups having different radial positions. Even when the spindle and the tool holder are rotating at a high speed, a stable and smooth supply of coolant can be achieved from each of the ejection port groups. Furthermore, by adjusting the supply pressure of coolant to each jet port group according to the processing form,
A more effective supply of coolant to the processing point is possible.

(Thirteenth Embodiment) In a thirteenth embodiment, the form of the supplied coolant is set to a state of any one of liquid, mist and gas or a combination of two or more kinds, and a coolant form most suitable for a working form is determined. Select, spindle,
Irrespective of situations that are conventionally considered disadvantageous to the supply of coolant, such as high-speed rotation of the tool holder or chip discharge, the supply and arrival of the coolant to the cutting tool and the processing point are stable and reliable.

(Fourteenth Embodiment) In the fourteenth embodiment, the type of coolant to be supplied is one of cutting oil, water, cold air, liquid nitrogen, and inert gas, or a combination of two or more types. Select the optimal coolant type, supply the coolant to the cutting tools and machining points, regardless of the situation that is considered disadvantageous to the coolant supply, such as high-speed rotation of the spindle and tool holder or chip discharge.
Reaching is stable and reliable.

(Fifteenth Embodiment) In the fifteenth embodiment, by combining the above-mentioned form and the kind of the supplied coolant, it is possible to select a coolant supply most suitable for the processing form, so that the cutting tool and the processing point can be selected. The supply and arrival of the coolant is stable and reliable.

(Sixteenth Embodiment) In the sixteenth embodiment, by applying different coolant forms, coolant types, and combinations thereof to each of the plurality of ejection ports for each cutting tool, the optimum cutting tool and cutting tool can be used. The coolant can be more effectively supplied to the processing point.

(Seventeenth Embodiment) In the seventeenth embodiment, a coolant supply method for supplying coolant during machining using the tool holder of the above-described embodiment is employed, so that a coolant is provided near the blade and the blade. The processing can be performed in a state where the supply and the arrival of the material are stable and reliable, and further higher precision processing and higher speed processing can be realized.

Although various embodiments of the tool holder of the present invention have been described above, the present invention is not limited to these embodiments, and can take various forms without departing from the gist thereof. It is.

As described above, according to the above embodiment, it is possible to reliably supply the coolant to all the processing points without causing interference with the workpiece regardless of the size and shape of the tool. Becomes

Further, it is possible to eliminate the trouble of setting the positions and orientations of the nozzle and the hose.

Further, it is not necessary to attach a special device around the tool.

Further, the coolant is not repelled by the rotating tool even at the time of high-speed rotation of the tool, so that the coolant can be reliably supplied to the processing point without being hindered by the air current caused by the swirling of air caused by the rotation of the tool. Can be.

In addition, the functions of cooling, lubrication, and chip discharge can be sufficiently exhibited.

Further, it is possible to cope with a high-pressure coolant, and in some cases, it is possible to supply a sufficient coolant to a processing point without using a high-pressure coolant.

Further, a sufficient cooling effect can be obtained by supplying a coolant to the blade from an appropriate direction.

Further, it is possible to perform high-precision machining by high-speed rotation of the spindle and the tool while maintaining a good dynamic balance.

In addition, there is no need to worry about corrosion of the tool holder and the like.

Further, since the tool holder is directly attached to the main shaft, the vicinity of the supply port can be sealed by applying a simple treatment such as an O-ring, and no special coupling or joint is required. Therefore, there is no fear that the coolant leaks, and no contamination or corrosion of the device by the coolant occurs. Furthermore, there is no change in the mounting accuracy of the tool and the spindle due to tool change, and at the same time, the dynamic balance at the time of rotation is not disrupted. By reducing vibration on the tool side, the life of the tool and the cutting tool is extended and high-precision machining is possible. .

Further, in recent years, a two-face restraint type tool shank has become widespread in order to cope with high-speed machining. However, in the above-described embodiment, there is also a problem that the tool holding force is reduced by directly attaching the tool holder to the main spindle. Does not occur.

In addition to the use of the tool holder according to the above-described embodiment, the coolant is supplied by the conventional method of supplying the coolant from the outer periphery of the tool holder. Even higher effects can be obtained on the emission of debris.

Further, since the supply pipes are evenly arranged in the tool holder, not only the cutting tool and the processing point but also the tool holder itself are uniformly cooled, and the axial elongation due to heat generation from the main spindle is suppressed. High-precision processing.

[0118]

As described above, according to the present invention, coolant can be reliably supplied to all machining points without interference with a workpiece regardless of the size and shape of a tool. Becomes

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a view showing an example having a jet port on an end face of a tool holder.

FIG. 2 is a view showing a second embodiment of the present invention, and is a view showing an example having an ejection port on a cutting tool mounting surface.

FIG. 3 is a view showing a third embodiment of the present invention, and is a view showing an example having an ejection port for each cutting tool.

FIG. 4 is a view showing a fourth embodiment of the present invention, and is a view showing an example in which an ejection port is located forward of a cutting tool rake face.

FIG. 5 is a view showing a fifth embodiment of the present invention, and is a view showing an example in which a cutting tool rake face is positioned in a jetting direction of a jet port.

FIG. 6 is a view showing a sixth embodiment of the present invention, and is a view showing an example in which an ejection port is located behind a cutting tool flank.

FIG. 7 is a view showing a seventh embodiment of the present invention, and is a view showing an example in which a cutting tool flank is positioned in a jetting direction of a jet port.

FIG. 8 is a view showing an eighth embodiment of the present invention, in which an ejection port has a nozzle shape.

FIG. 9 is a view showing a ninth embodiment of the present invention, and is a view showing an example in which all ejection ports communicate with the same supply port.

FIG. 10 is a view showing a tenth embodiment of the present invention, and is a view showing an example having a supply port for each ejection port.

FIG. 11 is a view showing an eleventh embodiment of the present invention, and is a view showing an example in which a jet port for each cutting tool communicates with the same supply port.

FIG. 12 is a view illustrating a twelfth embodiment of the present invention, and is a view illustrating an example in which a group of ejection ports having the same radial position communicates with the same supply port.

FIG. 13 is a diagram showing a state in which a tool holder is attached to a spindle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool holder 2 Supply port 3a, 3b, 3c Cutting tool 4 Injection port 5 Supply pipeline 6 Tool holder, rotation direction of main shaft 7 Coolant to be supplied

Claims (29)

[Claims] 1. A rotary tool holder which is directly attached to a main shaft of a machine tool and fixes at least one cutting tool, provided at a peripheral portion of the tool holder, and a cutting tool mounting portion for mounting the cutting tool, A coolant outlet opening on the surface of the tool holder in the vicinity of the blade mounting portion and closer to the rotation center of the tool holder than the cutting edge of the blade; and It is provided at a position closer to the rotation center of the tool holder than the outlet,
A supply port for supplying a coolant supplied from the outside of the tool holder; and a coolant supply pipe communicating from the supply port to the jet port from a center side of the tool holder toward an outer peripheral direction. A tool holder, characterized in that: 2. The tool holder according to claim 1, wherein the ejection port is opened on a blade mounting surface of the blade mounting portion. 3. The apparatus according to claim 2, further comprising a plurality of said blade mounting portions, wherein at least one of said ejection ports and at least one of said supply pipes are arranged near each of said plurality of said blade mounting portions. The tool holder according to claim 1. 4. The cutting tool mounting portion is arranged so that at least one of the ejection ports is located forward of the rake face of the cutting tool in the rotation direction of the tool holder. Tool holder according to 1. 5. The cutting tool mounting portion according to claim 1, wherein the cutting tool mounting portion is arranged such that a rake face of the cutting tool is located on an extension of at least one of the jet ports in a coolant jetting direction. Tool holder. 6. The cutting tool mounting portion according to claim 1, wherein the at least one ejection port is located behind the flank surface of the cutting tool in the rotational direction of the tool holder. Tool holder as described. 7. The tool holder according to claim 1, wherein the ejection port is formed in a nozzle shape. 8. The tool holder according to claim 1, wherein the plurality of ejection ports and the plurality of supply ports communicate with each other in a one-to-one correspondence. 9. The tool holder according to claim 1, wherein all the ejection ports communicate with the same supply port. 10. A supply port corresponding to one of the plurality of blade mounting portions, and a plurality of ejection ports for one blade mounting portion communicate with the same supply port. The tool holder according to claim 1, wherein 11. A plurality of nozzles having a plurality of nozzles with respect to one cutting tool mounting portion, wherein nozzles having the same radial position from the rotation center of the tool holder are communicated with the same supply port, and are different from each other. The tool holder according to claim 1, further comprising the individual supply ports corresponding to the ejection ports at radial positions. 12. The form of the supplied coolant is liquid,
2. The tool holder according to claim 1, wherein one of mist and gas or a combination of two or more types is used. 13. The tool according to claim 1, wherein the kind of the supplied coolant is any one of cutting oil, water, cold air, liquid nitrogen, and inert gas, or a combination of two or more kinds. holder. 14. The tool holder according to claim 1, wherein different coolant forms, coolant types, and combinations thereof are applied to each of the plurality of jet ports for each cutting tool. 15. Directly attached to the main shaft of the machine tool,
A rotary tool holder for fixing at least one cutting tool, comprising: a cutting tool mounting portion provided on a peripheral portion of the tool holder for mounting the cutting tool; and a cutting edge of the cutting tool near the cutting tool mounting portion. A coolant outlet opening on the surface of the tool holder near the center of rotation of the tool holder; provided on the outer peripheral surface of the tool holder at a position closer to the center of rotation of the tool holder than the outlet. A supply port for supplying a coolant supplied from the outside of the tool holder; and a supply pipe for a coolant communicating from the supply port to the ejection port from a center side of the tool holder toward an outer peripheral direction. A tool holder. 16. The tool holder according to claim 15, wherein the ejection port is opened on a cutting tool mounting surface of the cutting tool mounting portion. 17. The apparatus according to claim 17, further comprising: a plurality of the blade mounting portions, wherein at least one of the ejection ports and at least one of the supply conduits are arranged near each of the plurality of blade mounting portions. The tool holder according to claim 15, wherein 18. The cutting tool mounting part is arranged so that at least one of the ejection ports is located forward of the rake face of the cutting tool in the rotation direction of the tool holder. Tool holder according to 1. 19. The cutting tool mounting portion according to claim 15, wherein the cutting tool mounting portion is arranged such that a rake face of the cutting tool is located on an extension of at least one of the jet ports in a coolant jetting direction. Tool holder. 20. The cutting tool mounting portion according to claim 15, wherein the cutting tool mounting portion is arranged such that at least one of the ejection ports is located behind a flank of the cutting tool in a rotational direction of the tool holder. Tool holder as described. 21. The tool holder according to claim 15, wherein the ejection port is formed in a nozzle shape. 22. The tool holder according to claim 15, wherein the plurality of ejection ports and the plurality of supply ports communicate with each other in a one-to-one correspondence. 23. The tool holder according to claim 15, wherein all the ejection ports communicate with the same supply port. 24. The apparatus according to claim 24, wherein the plurality of cutting tool mounting portions have the supply ports corresponding one-to-one, and the plurality of ejection ports for one cutting tool mounting portion communicate with the same supply port. The tool holder according to claim 15, wherein 25. A plurality of nozzles having a plurality of nozzles for one blade tool mounting portion, and nozzles having the same radial position from the center of rotation of the tool holder are connected to the same supply port, and are different from each other. The tool holder according to claim 15, further comprising the individual supply ports respectively corresponding to the ejection ports at a radial position. 26. The coolant supplied is in the form of a liquid,
The tool holder according to claim 15, wherein one of mist and gas or a combination of two or more types is used. 27. The tool according to claim 15, wherein the kind of the supplied coolant is any one of cutting oil, water, cold air, liquid nitrogen, and inert gas, or a combination of two or more kinds. holder. 28. The tool holder according to claim 15, wherein different coolant forms, coolant types, and combinations thereof are applied to each of the plurality of jet ports for each cutting tool. 29. A coolant supply method using the tool holder according to claim 1 to supply coolant during machining.