JP2005335015A - Preset screw, tool holder, and fluid feeding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preset screw, a tool holder and a fluid feeding method for securing the sufficient amount of fluid consisting of a mist-like cutting oil solution and compressed gas, supplied to a contact part (a machining point) between a tool and a workpiece. <P>SOLUTION: The preset screw 100 is interposed between the tool 9 formed with a communicating hole 9a communicating a tip part with a base part, and the tool holder 1 for detachably supporting the tool, wherein the preset screw 100 is provided with a first communicating line for feeding the fluid formed of a mixture of liquid and gas, into the communicating hole 9a, and a second communicating line formed along the side face of the tool to communicate with the outside at the tip part of the tool holder and to feed the fluid to the internal space of the tool holder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes (1) a tool in which a communication hole communicating between the tip and the base is formed, and a preset screw interposed between the tool holder and (2) a detachable tool. The present invention relates to a supporting tool holder, and (3) a method of supplying fluid supplied to the tool for the purpose of lubrication or the like.

In recent years, with the aim of reducing environmental impact and further cost reduction, to reduce the amount of cutting fluid used for machining (cutting fluid used for cooling, lubrication and chip removal) Efforts are being made.
As part of such efforts, a shift from conventional wet processing to MQL (Minimum Quantity Lubrication) processing such as semi-dry processing and dry processing is being promoted.
Here, the semi-dry process is a process in which the atomized cutting fluid is pumped together with compressed gas (usually air) and supplied to the contact part (working point) between the tool used during machining and the workpiece. Refers to the method.

  In the conventional wet processing, the cutting fluid agent performs (a) lubrication, (b) cooling, and (c) chip removal, whereas in the semi-dry processing, the cutting fluid agent performs (a) lubrication. The compressed gas mainly performs (b) cooling and (c) chip removal.

As preset screws applicable to the semi-dry processing as described above, the preset screws described in Patent Document 1 and Patent Document 2 are known.
JP-A-11-333663 JP 2000-317768 A

In semi-dry machining, in order to reliably perform (a) lubrication, it is necessary to supply the cutting fluid to the processing point while maintaining the state of the cutting fluid fed together with the compressed gas in a mist state.
Further, in the semi-dry processing, in order to reliably perform (b) cooling and (c) chip removal, it is necessary to ensure a sufficient flow rate of the compressed gas.

  However, when a mixture (fluid) of atomized cutting fluid and compressed gas is ejected from the tip of the tool through the communication hole that communicates between the tip and base of the tool, it is formed in the tool by the diameter of the tool. The diameter of the communication hole is also restricted. Therefore, in order to ensure a sufficient flow rate of the compressed gas, it is necessary to increase the set value of the pressure for pumping the fluid. However, the size of the pumping means (pump) is increased, and the tip of the tool from the pumping means is increased. This leads to the complexity of countermeasures against leakage (pressure loss) in the pressure-feeding route up to the point, resulting in an increase in equipment cost.

In particular, when the pressure when the fluid is pumped is increased, the base of the tool that is configured to be detachable and the amount of protrusion of the tool from the tool holder by adjusting the amount of protrusion from the tool holder are adjusted. It is difficult to prevent leakage between the preset screw leading to the formed communication hole.
Then, when fluid leaks from the gap generated in the contact portion between the base of the tool and the preset screw, the mist-like cutting fluid aggregates in the portion and becomes liquid, and is supplied to the tip of the tool. The amount of cutting fluid decreases.

  In view of the above situation, the present invention is a preset capable of sufficiently securing the amount of fluid composed of a mist-like cutting fluid and a compressed gas supplied to a contact portion (processing point) between a tool and a workpiece. A screw, a tool holder, and a fluid supply method are provided.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, in the preset screw interposed between the tool in which the communication hole that communicates the tip portion and the base is formed and the tool holder that removably supports the tool,
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
And a second communication path that is formed along the side surface of the tool and that supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder.

According to a second aspect of the present invention, the preset screw includes an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
The first communication path is formed by communicating the bottom of a bowl-shaped contact surface that is formed on the front end surface and contacts the base of the tool, and the rear end surface.

According to a third aspect of the present invention, the preset screw includes: an outer peripheral surface that contacts the inner peripheral surface of the internal space; a front end surface that faces the internal space; and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
In the case where a plurality of the second communication paths are provided, the plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw.

  In Claim 4, said 2nd communication path consists of a notch formed in the outer peripheral surface of a preset screw, and a side path which connects this notch and said 1st communication path. .

  In claim 5, the side of the tool holder is positioned so that the junction of the side path and the notch is located on the tip side of the tool holder with respect to the junction of the side path and the first communication path. The direction path is inclined.

  According to a sixth aspect of the present invention, the cross-sectional shape of the first communication path is formed in a substantially hexagonal shape.

In claim 7, in the tool holder that removably supports the tool in which the communication hole that communicates the tip and the base is formed,
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
A second communication path that is formed along the side surface of the tool and supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder;
Is interposed between the tool and the tool holder.

In the eighth aspect of the invention, the preset screw includes an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
The first communication path is formed by communicating the bottom of a bowl-shaped contact surface that is formed on the front end surface and contacts the base of the tool, and the rear end surface.

According to a ninth aspect of the present invention, the preset screw includes: an outer peripheral surface that is in contact with an inner peripheral surface of the inner space; a front end surface that faces the inner space; and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
In the case where a plurality of the second communication paths are provided, the plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw.

  In Claim 10, said 2nd communicating path consists of a notch formed in the outer peripheral surface of a preset screw, and a side path which connects this notch and said 1st communicating path. .

  The side of the tool holder according to claim 11, wherein a merging point of the side path and the notch is positioned closer to a tip side of the tool holder than a merging point of the side path and the first communication path. The direction path is inclined.

  According to a twelfth aspect of the present invention, the cross-sectional shape of the first communication path is formed in a substantially hexagonal shape.

According to a thirteenth aspect of the present invention, in the fluid supply method of supplying a fluid composed of a mixture of liquid and gas to a tool that is detachably supported by the tool holder and has a communication hole that communicates the tip and the base.
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
A second communication path that is formed along the side surface of the tool and supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder;
A preset screw comprising a tool and a tool holder,
The fluid is ejected from the tip portion of the tool, and the fluid is ejected toward the side surface and the tip portion of the tool protruding from the tool holder.

According to a fourteenth aspect of the present invention, the preset screw includes an outer peripheral surface that abuts on an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
The first communication path is formed by communicating the bottom of a bowl-shaped contact surface that is formed on the front end surface and contacts the base of the tool, and the rear end surface.

According to a fifteenth aspect of the present invention, the preset screw includes an outer peripheral surface that contacts the inner peripheral surface of the inner space, a front end surface that faces the inner space, and a rear end surface that is a surface opposite to the front end surface. A substantially cylindrical shape comprising:
In the case where a plurality of the second communication paths are provided, the plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw.

  In Claim 16, said 2nd communication path consists of a notch formed in the outer peripheral surface of a preset screw, and a side path which connects this notch and said 1st communication path. .

  In Claim 17, it is this side so that the confluence of the said side path and the said notch is located in the front end side of a tool holder rather than the confluence of this side path and the said 1st communicating path. The direction path is inclined.

  According to an eighteenth aspect of the present invention, the cross-sectional shape of the first communication path is formed in a substantially hexagonal shape.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to increase the amount of fluid supplied to the tool (more precisely, the processing point that is the contact portion between the tool and the workpiece).

  According to the second aspect, even when a tool having a different outer diameter is supported (fixed) on the tool holder, it is possible to maintain airtightness at the contact portion between the base portion of the tool and the contact surface of the preset screw.

  In claim 3, the supply of fluid to the internal space is performed substantially uniformly, the mist-like cutting fluid is prevented from aggregating and liquefying in the internal space, and the mist ejected from the tip of the tool holder It is possible to increase the amount of the cutting fluid.

  According to the fourth aspect of the present invention, the second communication path can be easily formed.

  In claim 5, the pressure loss of the compressed gas passing through the second communication path is suppressed, the mist-like cutting fluid is prevented from aggregating and liquefying, and the mist-like shape ejected from the tip of the tool holder It is possible to increase the amount of cutting fluid.

  In claim 6, when the preset screw is attached to or detached from the tool holder or the position of the preset screw attached to the tool holder is adjusted, it can be easily rotated with a tool such as a hexagon wrench. Excellent in properties.

  According to the seventh aspect of the present invention, it is possible to increase the amount of fluid supplied to the tool (more precisely, the processing point that is the contact portion between the tool and the workpiece).

  According to the eighth aspect of the present invention, even when a tool having a different outer diameter is supported (fixed) on the tool holder, it is possible to maintain airtightness at the contact portion between the base portion of the tool and the contact surface of the preset screw.

  In claim 9, the fluid is supplied to the internal space substantially uniformly, the mist-like cutting fluid is prevented from aggregating and liquefying in the internal space, and the mist ejected from the tip of the tool holder It is possible to increase the amount of the cutting fluid.

  In the tenth aspect, the second communication path can be easily formed.

  In claim 11, the pressure loss of the compressed gas passing through the second communication path is suppressed, the mist-like cutting fluid is prevented from aggregating and liquefying, and the mist-like shape ejected from the tip end portion of the tool holder It is possible to increase the amount of cutting fluid.

  In claim 12, when the preset screw is attached to or detached from the tool holder or the position of the preset screw attached to the tool holder is adjusted, it can be easily rotated with a tool such as a hexagon wrench. Excellent in properties.

  According to the thirteenth aspect, it is possible to increase the amount of fluid supplied to the tool (more precisely, the processing point that is the contact portion between the tool and the workpiece).

  According to the fourteenth aspect, even when a tool having a different outer diameter is supported (fixed) on the tool holder, it is possible to maintain airtightness at the contact portion between the base portion of the tool and the contact surface of the preset screw.

  In claim 15, the supply of fluid to the internal space is performed substantially uniformly, the mist-like cutting fluid is prevented from aggregating and liquefying in the internal space, and the mist ejected from the tip of the tool holder It is possible to increase the amount of the cutting fluid.

  In the sixteenth aspect, it is possible to easily form the second communication path.

  In claim 17, the pressure loss of the compressed gas passing through the second communication path is suppressed, the mist-like cutting fluid is prevented from aggregating and liquefying, and the mist-like shape ejected from the tip of the tool holder It is possible to increase the amount of cutting fluid.

  In claim 18, when the preset screw is attached to and detached from the tool holder or the position of the preset screw attached to the tool holder is adjusted, it can be easily rotated with a tool such as a hexagon wrench. Excellent in properties.

Below, the whole structure of the tool holder 1 which comprises the preset screw 100 which is the 1st Example of the preset screw which concerns on this invention using FIG. 1 is demonstrated.
In the following description, the direction of the arrow A shown in FIG. 1 is defined as “front” for convenience.

  Further, the preset screw according to the present invention functions as a protruding amount adjusting member that adjusts the amount of the tool protruding from the tip of the tool holder (attachment position with respect to the tool holder) and a supply path for supplying fluid to the tool. In addition to a preset screw having a relative rotation prevention function for locking the tool against relative rotation with respect to the tool holder, and a function as a supply path for supplying fluid to the tool. Including a tool driver provided or the like includes “a function provided as a supply path that is interposed between a tool and a tool holder and supplies a fluid to the tool”.

  Here, the “fluid” in the present embodiment is a mixture of the cutting fluid and the compressed gas, but is not limited thereto. That is, the “fluid” in the following description includes a mixture of liquid and gas capable of performing lubrication, cooling, and chip removal at a processing point.

The tool holder 1 can be attached to and detached from a drive shaft (main shaft) of a machine tool or the like, and mainly includes a main body 2, a collet 3, a collet nut 4, a preset screw 100, and the like.
The tool 9 attached to the tool holder 1 is rotationally driven by a machine tool or the like to machine a workpiece. The tool 9 is formed with a communication hole 9 a that communicates the end surface on the base (part attached to the tool holder 1) side and the tip (part protruding from the tool holder 1).
In addition, although the tool 9 in a present Example is a drill which makes a hole in a workpiece, it is not limited to this, A tap, an end mill, a reamer, etc. may be sufficient.

  In the main body 2, a tool attachment portion 21, a flange portion 22, and a tapered shank portion 23 are formed in order from the front to the rear.

The tool attachment portion 21 has a substantially cylindrical shape, and a male screw for screwing the collet nut 4 is formed at the front end portion of the outer peripheral surface thereof. Further, a tool accommodation hole 21a is formed from the front end surface of the tool mounting portion 21 toward the rear, and a female screw 21b for screwing the preset screw 100 is formed on the inner peripheral surface of the tool accommodation hole 21a.
Furthermore, a tapered surface 21c having a diameter increasing toward the front is formed at the front end portion of the inner peripheral surface of the tool accommodation hole 21a.

  The flange portion 22 is a projecting portion for fixing the tool holder 1 to a drive shaft (main shaft) of a machine tool or the like. Further, the taper shank portion 23 is a part that comes into contact with a taper surface formed on the drive shaft (main shaft) side of a machine tool or the like, and the rotation axis of the tool holder 1 and the rotation axis of the drive shaft of the machine tool or the like. It is formed to make it approximately match easily.

  As shown in FIGS. 1 and 2, the collet 3 is a substantially cylindrical member for detachably attaching the tool 9 to the tool holder 1. The collet 3 is formed with a through hole 31 penetrating from the front end surface to the rear end surface thereof, and a tapered surface 32 having a diameter reduced from the front / rear midway portion to the rear on the outer peripheral surface of the collet 3. Further, communication grooves 33, 33... Cut from the front end surface to the rear end surface of the collet 3 are formed on the inner peripheral surface of the through hole 31. Further, the collet 3 is formed with a plurality of slits 34.

The collet nut 4 is locked to the collet 3 so as to be relatively rotatable, and is screwed to a male screw formed at the front end portion of the outer peripheral surface of the tool mounting portion 21. When the collet nut 4 is screwed onto the tool attachment portion 21, the tapered surface 32 of the collet 3 is pressed against the tapered surface 21 c formed on the tool attachment portion 21. At this time, since a plurality of slits 34, 34... Are formed in the collet 3, the collet 3 is elastically deformed inward to reduce the gap between the slits 34, 34. That is, the diameter of the through hole 31 is reduced.
Therefore, the tool 9 inserted through the through hole 31 is in strong contact with the through hole 31 and is fixed to the tool holder 1.

Below, the detailed structure of the preset screw 100 which is the 1st Example of the preset screw which concerns on this invention is demonstrated using FIG.1, FIG.3 and FIG.4.
The preset screw 100 has a function as a protruding amount adjusting member that adjusts an amount of the tool 9 protruding from the tip of the tool holder 1 (attachment position with respect to the tool holder 1), and a fluid (in the case of the present embodiment, a mist) And a function as a supply path for supplying a mixture of a cutting fluid and a compressed gas.

  The preset screw 100 is a substantially cylindrical member including an outer peripheral surface 101, a front end surface 102, and a rear end surface 103 that is a surface opposite to the front end surface. The preset screw 100 is interposed between the tool 9 and the tool holder 1 that detachably supports the tool 9.

A male screw 101 a is formed on the outer peripheral surface 101. The male screw 101a and the female screw 21b formed on the inner peripheral surface of the tool housing hole 21a of the tool holder 1 are screwed together to fix the preset screw 100 at a desired position in the tool housing hole 21a. Is possible.
Further, when the preset screw 100 is screwed into the tool accommodation hole 21a, the outer peripheral surface 101 of the preset screw 100 and the inner peripheral surface of the tool accommodation hole 21a come into contact with each other.

A contact member accommodation hole 102a is formed in the front end surface 102, and the contact member 104 is accommodated in the corresponding contact member accommodation hole 102a.
The contact member 104 has a bowl-shaped contact surface 104a, and the base of the tool 9 contacts the contact surface 104a as shown in FIG. By forming the contact surface 104a in a bowl shape, the airtightness at the contact portion between the base portion of the tool 9 and the contact surface 104a even when the tool 9 having a different outer diameter is supported (fixed) on the tool holder 1 is used. It is possible to hold
Moreover, since it is not necessary to replace the preset screw 100 according to the outer diameter of the tool 9, the time required for the replacement work of the tool 9 can be shortened, and the workability is excellent.

  The contact member 104 is made of a material that does not elastically deform, such as metal or hard plastic, or a material that elastically deforms to some extent, such as rubber or resin. At this time, the material used for the contact member 104 is appropriately selected according to the type and application of the tool 9. That is, when the load applied in the axial direction of the tool 9 during machining is large, a material (for example, metal) that does not elastically deform due to little wear on the contact surface 104a is selected, and in the axial direction of the tool 9 during machining. When such a load is small, a material (such as rubber or resin) that is elastically deformed is selected with emphasis on airtightness on the contact surface 104a.

As shown in FIG. 4A, even when the edge (peripheral edge) of the base side end surface of the tool 9 stands, the edge contacts the contact surface 104a of the contact member 104 to maintain airtightness. However, as shown in FIG. 4 (b), the tool 9 and the contact surface are formed by forming a tapered surface 9b at the edge portion of the base side end surface of the tool 9 so as to match the contact surface 104a. The airtightness at the contact portion with 104a is further improved.
Further, in the present embodiment, the main body of the preset screw 100 and the contact member 104 are separated, but they may be integrally formed.

The preset screw 100 is formed with a central path 105 that communicates the bottom of the contact surface 104 a and the rear end surface 103.
The central path 105 is a fluid pressure-feed path formed in the rear half of the tool holder 1 at the end on the rear end face 103 side (more precisely, the pull stud 6 screwed on the rear end of the tool holder 1). The through hole 6a communicates with a fluid pressure feed pipe 7) fitted in the through hole 6a in an airtight and slidable manner.
Therefore, the fluid made of a mixture of the mist-like cutting fluid and the compressed gas fed from the machine tool side to which the tool holder 1 is attached passes through the through hole 6a → the fluid pressure feeding pipe 7 → the central path 105 → the communication hole 9a. It is ejected to the outside from the tip of the tool 9 and supplied to the contact portion (working point) between the tool 9 and the workpiece. Then, the tip portion of the tool 9 is lubricated and cooled, and chips of the work piece staying at the processing point are blown off and removed.
Moreover, the tool 9 is cooled from the inside by the fluid passing through the communication hole 9 a formed inside the tool 9.

On the other hand, when the tool 9 is supported (fixed) on the tool holder 1, the tool holder 1 mainly includes an inner peripheral surface of the tool mounting hole 21a, a side surface of the tool 9, a rear end surface of the collet 3, and a preset. An annular (tube-shaped) internal space 50 surrounded by the front end face 102 of the screw 100 is formed. The internal space 50 communicates with the outside of the tool holder 1 through communication grooves 33, 33... Formed in the collet 3.
Two notches 106 and 106 are formed on the outer peripheral surface 101 of the preset screw 100, and two side paths 107 and 106 that communicate with the notches 106 and 106 and the central path 105 are formed. 107 is formed. At this time, the notches 106 and 106 are cut through to the front end face 102 side (inside the internal space 50 side) and are not cut through to the rear end face 103 side.
Therefore, the fluid composed of the mixture of the mist-like cutting fluid and the compressed gas fed from the machine tool side to which the tool holder 1 is attached passes through the hole 6a → the fluid pumping pipe 7 → the central path 105 → the side path 107 → It is supplied to the internal space 50 through the notch 106, and is further ejected from the front end surface of the collet 3 (that is, the front end portion of the tool holder 1) through the communication grooves 33, 33. . Then, the side surface of the tool 9 is lubricated and cooled, and chips of the workpiece staying around the processing point are blown off and removed.

As described above, the preset screw 100, which is the first embodiment of the preset screw according to the present invention, supports the tool 9 in which the communication hole 9a communicating the tip portion and the base portion is formed, and the tool 9 is detachable. It is interposed between the tool holder 1 and
A first communication path for supplying fluid to the communication hole 9a (in this embodiment, the central path 105 corresponds to the first communication path);
A second communication path (mainly) that supplies fluid to the internal space 50 of the tool holder 1 that is formed along the side surface of the tool 9 and communicates with the outside through the communication grooves 33, 33. In the case of the embodiment, the side path 107 and the notch 106 correspond to a second communication path).

Such a configuration has the following advantages.
That is, the preset screw 100 of the present embodiment ejects a fluid composed of a mist-like cutting fluid and compressed gas from the tip portion of the tool 9 and toward the side surface and the tip portion of the tool 9 protruding from the tool holder 1. The fluid can be ejected, and to the tool 9 (more precisely, the processing point that is the contact portion between the tool 9 and the workpiece) than when the fluid is ejected only from the tip portion of the tool 9. It is possible to increase the supply amount of the fluid (to ensure a sufficient supply amount).

Further, the pressure acting on the fluid passing through the internal space 50 communicating with the second communication path (the side path 107 and the notch 106) becomes a back pressure, and the communication hole 9a of the tool 9 and the first series communication path. It is possible to suppress leakage of fluid from the connecting portion (corresponding to a space surrounded by the base-side end surface of the tool 9 and the contact surface 104a) to the internal space 50.
Thereby, the mist-like cutting fluid contained in the fluid passing through the first communication path at the leakage portion is prevented from aggregating and liquefying, and the mist-like cutting fluid ejected from the tip of the tool 9 It is possible to increase the amount (to ensure a sufficient supply amount).

Furthermore, the fluid pressure feeding path in the tool holder 1 is a path for ejecting fluid from the tip of the tool 9, and the fluid is ejected from the tip of the tool holder 1 toward the side surface and the tip of the tool 9. And the function of branching to the path (that is, the first communication path, the second communication path, and these branch points) are concentrated in the preset screw 100. Therefore, it is not necessary to perform special processing on the main body side of the tool holder 1, and the number of manufacturing steps can be reduced as a whole.
In addition, since no special processing is required on the main body side of the tool holder 1, the preset screw of the existing tool holder is replaced with the preset screw 100 of the present embodiment, and a communication path to the outside is formed in the existing collet. Or replacing the collet 3 to easily increase the amount of fluid supplied to the tool 9 (more precisely, the machining point that is the contact portion between the tool 9 and the workpiece) (sufficient supply amount) Can be ensured).

The preset screw 100, which is a first embodiment of the preset screw according to the present invention, includes an outer peripheral surface 101 that contacts the inner peripheral surface of the inner space 50 (the inner peripheral surface of the tool receiving hole 21), and the inner space 50. A substantially cylindrical shape comprising a front end surface 102 facing the front end surface 102 and a rear end surface 103 which is a surface opposite to the front end surface 102,
A central path 105 that is a first communication path communicates the bottom of a bowl-shaped contact surface 104 a that is formed on the front end surface 102 and contacts the base of the tool 9 and the rear end surface 103. .

With this configuration, even when a tool 9 having a different outer diameter is supported (fixed) on the tool holder 1, it is possible to maintain airtightness at the contact portion between the base portion of the tool 9 and the contact surface 104a. It is.
In addition, since the airtightness at the contact portion between the base portion of the tool 9 and the contact surface 104a is maintained, the responsiveness at the start of fluid ejection is improved (the fluid pumping means such as a pump is driven to The time required for the fluid to actually be ejected from the tip of the tool after the start of the ejection of is reduced.
Furthermore, it is not necessary to replace the preset screw 100 according to the outer diameter of the tool 9, and the time required for the replacement work of the tool 9 can be shortened, resulting in excellent workability.

  The preset screw 100, which is a first embodiment of the preset screw according to the present invention, includes two second communication paths (consisting of a notch 106 and a side path 107). The second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface 101 of the preset screw 100. That is, as shown in FIG. 3A, when the preset screw 100 is viewed from the front, the two second communication paths (consisting of the notch 106 and the side path 107) are the first communication. It arrange | positions in the position rotated 180 degree | times centering on the path | route (center path | route 105).

  With this configuration, the fluid is supplied to the internal space 50 substantially uniformly, and the mist-like cutting fluid is prevented from aggregating and liquefying in the internal space 50, and the tip of the tool holder 1. It is possible to increase the amount of the mist-like cutting fluid sprayed from the communication grooves 33, 33... Formed in the collet 3 (ensure a sufficient supply amount).

  In addition, the second communication path in the preset screw 100 which is the first embodiment of the preset screw according to the present invention includes a notch 106 formed on the outer peripheral surface 101 of the preset screw 100, and the notch 106 and the first communication path. And a side path 107 communicating with the path (central path 105).

With this configuration, it is possible to easily form the second communication path.
In the present embodiment, specifically, a part of the outer peripheral surface 101 of the preset screw 100 is cut to form a notch 106, and then a side path 107 is drilled from the notch 106 toward the central path 105. Set up.

Below, the detailed structure of the preset screw 200 which is a 2nd Example of the preset screw which concerns on this invention is demonstrated using FIG.
The basic configuration of the preset screw 200 is substantially the same as the preset screw 100.
That is, the preset screw 200 has an outer peripheral surface 201 that contacts the inner peripheral surface of the internal space 50 (the inner peripheral surface of the tool receiving hole 21), a front end surface 202 that faces the internal space 50, and the opposite of the front end surface 202. A substantially cylindrical shape having a rear end surface 203 which is a side surface,
A central path 205, which is a first communication path, communicates the bottom of a bowl-shaped contact surface 204a that is formed on the front end surface 202 and contacts the base of the tool 9, and the rear end surface 203,
The second communication path includes notches 206, 206, 206, and 206 formed on the outer peripheral surface 201 of the preset screw 200, the notches 206, 206, 206, and 206, and the first communication path (central path 105). Side paths 207, 207, 207 and 207 communicating with each other.

  The preset screw 200 is different from the preset screw 100 in that the outer peripheral surface of the preset screw 200 has four second communication paths including notches 206 and side paths 207, and the four second screws. That is, the communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface 201 of the preset screw 200. That is, as shown in FIG. 5A, when the preset screw 200 is viewed from the front, the four second communication paths rotate 90 degrees about the first communication path (central path 105). It is arranged at the position.

As described above, the number of the second communication paths included in the preset screw can be appropriately selected in consideration of the balance of the amount of fluid distributed to the first communication path and the second communication path. is there. That is, like the preset screw 100 and the preset screw 200, the number of second communication paths is not limited to two and four, and may be one, three, or five or more.
However, as seen from the front, the smaller the phase difference between the communication grooves 33, 33... Formed in the collet 3 and the second communication path, the smaller the mist that is ejected from the communication grooves 33, 33. Since the amount of the cutting fluid tends to increase, it is preferable to provide the same number of communication grooves and second communication paths and match the phases when viewed from the front of the communication grooves and the second communication paths.

Below, the detailed structure of the preset screw 300 which is the 3rd Example of the preset screw based on this invention is demonstrated using FIG.
The basic configuration of the preset screw 300 is substantially the same as that of the preset screw 100.
That is, the preset screw 300 includes an outer peripheral surface 301 that contacts the inner peripheral surface of the internal space 50 (the inner peripheral surface of the tool receiving hole 21), a front end surface 302 that faces the internal space 50, and the opposite of the front end surface 302. A substantially cylindrical shape having a rear end surface 303 which is a side surface,
A central path 305 that is a first communication path communicates the bottom of a bowl-shaped contact surface 304 a that is formed on the front end surface 302 and contacts the base of the tool 9, and the rear end surface 303.
The second communication path includes notches 306 and 306 formed on the outer peripheral surface 301 of the preset screw 300, and side paths 307 and 307 that communicate the notches 306 and 306 with the first communication path (central path 305). 307.

  The preset screw 300 is different from the preset screw 100 in that the joining point of the side path 307 and the notch 306 forming the second communication path is the side path 307 and the first communication path (central path 305). ) And the side path 307 is inclined so as to be positioned closer to the tip end side of the tool holder 1 than the merging point.

  By comprising in this way, the pressure loss of the compressed gas which passes a 2nd communication path is suppressed, it prevents that a mist-like cutting fluid aggregates and liquefies, and is ejected from the front-end | tip part of the tool holder 1. It is possible to increase the amount of atomized cutting fluid.

Below, the detailed structure of the preset screw 400 which is the 4th Example of the preset screw based on this invention is demonstrated using FIG.
The basic configuration of the preset screw 400 is substantially the same as that of the preset screw 100.
That is, the preset screw 400 includes an outer peripheral surface 401 that contacts the inner peripheral surface of the internal space 50 (the inner peripheral surface of the tool receiving hole 21), a front end surface 402 that faces the internal space 50, and the opposite of the front end surface 402. A substantially cylindrical shape having a rear end surface 403 which is a side surface,
A central path 405 that is a first communication path communicates the bottom of a bowl-shaped contact surface 404a that is formed on the front end surface 402 and contacts the base of the tool 9, and the rear end surface 403,
The second communication path includes notches 406 and 406 formed on the outer peripheral surface 401 of the preset screw 400, and side paths 407 and 407 that connect the notches 406 and 406 to the first communication path (central path 405). 407.

The preset screw 400 is different from the preset screw 100 in that the cross-sectional shape of the first communication path (central path 405) is formed in a substantially hexagonal shape (see FIG. 7A).
With this configuration, the preset screw 400 can be easily rotated with a tool such as a hexagon wrench when the preset screw 400 is attached to or detached from the tool holder 1 or the position where the preset screw 400 is attached to the tool holder 1 is adjusted. Is possible and has excellent workability.

  The cross-sectional shape of the first communication path is not limited to a substantially circular shape or a substantially hexagonal shape as in the present embodiment, and may be a square shape or other shapes as long as the preset screw can be rotated by some tool.

The side view of a tool holder. (A) The figure which looked at the collet from the front, and (b) Side surface sectional drawing of a collet. (A) The figure which looked at the 1st Example of the preset screw which concerns on this invention from the front, (b) Side surface sectional drawing of a 1st Example similarly. (A) The figure which shows the state which the tool with which the end surface of the base part was not chamfering contact | abutted to the 1st Example of the preset screw which concerns on this invention, and (b) The end surface of a base part is also chamfered similarly to the 1st Example. The figure which shows the state which the tool which contacted contacted. The figure which looked at the 2nd example of the preset screw concerning the present invention from the front. (A) The figure which looked at 3rd Example of the preset screw which concerns on this invention from the front, (b) Side surface sectional drawing of 3rd Example similarly. (A) The figure which looked at 4th Example of the preset screw which concerns on this invention from the front, (b) Side surface sectional drawing of 4th Example similarly.

Explanation of symbols

1 Tool holder 9 Tool 9a Communication hole 50 Internal space 100 Preset screw 105 Central path (first communication path)
106 Notch (second communication path)
107 Side route (second communication route)

Claims (18)

In a preset screw interposed between a tool in which a communication hole that communicates the tip and the base is formed, and a tool holder that removably supports the tool,
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
A second communication path that is formed along the side surface of the tool and supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder;
A preset screw characterized by comprising: The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
The said 1st communicating path | route connects the bottom of the bowl-shaped contact surface formed in this front end surface, and contact | abutted with the base of a tool, and this rear end surface. Preset screw. The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
3. When the plurality of second communication paths are provided, the plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw. Preset screw as described in.   The second communication path includes a notch formed in an outer peripheral surface of a preset screw, and a side path that communicates the notch with the first communication path. The preset screw according to any one of claims 3 to 4.   The side path is inclined so that the confluence of the side path and the notch is located closer to the tip side of the tool holder than the confluence of the side path and the first communication path. The preset screw according to claim 4.   The preset screw according to any one of claims 1 to 5, wherein a cross-sectional shape of the first communication path is formed in a substantially hexagonal shape. In a tool holder that removably supports a tool in which a communication hole that communicates the tip and the base is formed,
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
A second communication path that is formed along the side surface of the tool and supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder;
A tool holder, comprising: a preset screw comprising: a tool and a tool holder. The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
The first communication path communicates a bottom of a bowl-shaped contact surface that is formed on the front end surface and contacts a base portion of the tool, and the rear end surface. Tool holder. The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
The plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw when the plurality of second communication paths are provided. Tool holder according to   The second communication path includes a notch formed on an outer peripheral surface of a preset screw, and a side path that communicates the notch with the first communication path. The tool holder according to any one of claims 9 to 10.   The side path is inclined so that the confluence of the side path and the notch is located closer to the tip side of the tool holder than the confluence of the side path and the first communication path. The tool holder according to claim 10.   The tool holder according to any one of claims 7 to 11, wherein a cross-sectional shape of the first communication path is formed in a substantially hexagonal shape. In a fluid supply method for supplying a fluid composed of a mixture of a liquid and a gas to a tool that is detachably supported by a tool holder and has a communication hole that communicates a tip portion and a base portion.
A first communication path for supplying a fluid composed of a mixture of liquid and gas to the communication hole;
A second communication path that is formed along the side surface of the tool and supplies the fluid to the internal space of the tool holder that communicates with the outside at the tip of the tool holder;
A preset screw comprising a tool and a tool holder,
A fluid supply method characterized by ejecting the fluid from a tip portion of a tool and ejecting the fluid toward a side surface and a tip portion of the tool protruding from the tool holder. The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
The first communication path communicates a bottom of a bowl-shaped contact surface that is formed on the front end surface and contacts a base portion of the tool, and the rear end surface. Fluid supply method. The preset screw has a substantially cylindrical shape including an outer peripheral surface that is in contact with an inner peripheral surface of the internal space, a front end surface that faces the internal space, and a rear end surface that is a surface opposite to the front end surface. There,
15. When the plurality of second communication paths are provided, the plurality of second communication paths are arranged at substantially equal intervals in the circumferential direction of the outer peripheral surface of the preset screw. The fluid supply method described in 1.   The second communication path includes a notch formed on an outer peripheral surface of a preset screw, and a side path that communicates the notch with the first communication path. The fluid supply method according to claim 15.   The side path is inclined so that the confluence of the side path and the notch is located closer to the tip side of the tool holder than the confluence of the side path and the first communication path. The fluid supply method according to claim 16.   The fluid supply method according to any one of claims 13 to 17, wherein a cross-sectional shape of the first communication path is formed in a substantially hexagonal shape.

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