JP5276504B2 - Tool having a flow path in the tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool discharging chips generated at a machining point efficiently by air flow without leaving the chips behind. <P>SOLUTION: In this tool 5, a blade part 21 is held in a shank 20, and a tool inner flow passage 4 for sucking chips 22 and air 23 is formed inside the tool. The tool inner flow passage has a through-hole 24 in the shank, a main inflow hole 25 communicating with the through-hole formed in the blade part to suck air and chips, and an auxiliary inflow hole 26 communicating with the through-hole formed in the shank to suck air and chips. A cylindrical member 40 opened near a machining point is provided in the shank, and air passes through a space S inside the cylindrical member and flows into the auxiliary inflow hole 26 together with the chips produced at a machining point B. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a tool having a flow path in a tool that is attached to a machine tool and used to process a workpiece.

Patent Document 1 (Japanese Patent Publication No. 2005-532917) discloses a milling tool in which a chip lead-out passage is formed inside a tool so that chips (chips) generated when machining a workpiece are caused to flow together with air. Is described.
In this milling tool, a gap is formed in the milling head (blade part) at the tip. Chips generated during processing are sucked into the gap and then discharged after entering the chip lead-out passage.

JP 2005-532917 A

The milling tool described in Patent Document 1 has a large gap when the tool diameter is large, and the amount of air sucked from the gap also increases. As a result, the flow velocity of the air flowing in the chip lead-out passage is increased, and the chip is sucked together with the air and discharged well in the chip lead-out passage.
However, if the tool diameter of the milling tool is small, the cross-sectional area of the gap is also small, so that the flow rate flowing therethrough is also small. Then, the flow velocity of the air in the tip lead-out passage is also slowed and the suction force is reduced. As a result, the chips sucked together with the air from the gap gradually accumulate in the chip lead-out passage, and it may be difficult to discharge the chips well.

  In addition, in a tool having a flow path in the tool, there has been a demand for measures for efficiently discharging chips (chips) generated at a processing point where the workpiece is processed by the blade portion without leaving behind. .

  The present invention has been made to solve such problems, and efficiently removes chips generated at a machining point where a workpiece is machined by a blade portion of a tool by an air flow without leaving behind. Regardless of the size of the tool, the air that flows through the flow path in the tool at an appropriate flow rate and sucks the chips can be discharged well without the chips accumulating in the flow path in the tool. An object of the present invention is to provide a tool having an in-tool flow path.

In order to achieve the above-described object, a tool having a flow path in a tool according to the present invention has a blade portion held by a shank and sucks chips generated when machining a workpiece with the blade portion together with air. The tool internal flow path is a tool formed inside the tool, and the tool internal flow path formed in the tool sucks the chips together with the through-hole formed in the shank and the air. And at least one main inflow hole formed in the blade portion and communicated with the through hole, and at least one auxiliary inflow hole formed in the shank for sucking the chips together with the air and communicated with the through hole. A cylindrical member that opens in the vicinity of a machining point for machining the workpiece by the blade portion is provided in the shank, and the air is generated along with the chips generated at the machining point, And to flow to the auxiliary inlet hole through the interior space of the serial tubular member.
As a preferred embodiment, the shank includes a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion. And a plurality of the auxiliary inflow holes that open to the taper portion are arranged side by side in the circumferential direction of the shank, and the cylindrical member has a cylindrical shape with the same diameter with respect to the axial direction of the shank. It is preferable to be engaged and fixed to the outer peripheral surface of the large-diameter portion.
As another preferred embodiment, the shank includes a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion. And a plurality of the auxiliary inflow holes opened in the tapered portion are arranged in the circumferential direction of the shank, and the cylindrical member has a cylindrical shape (preferably a circular cross section). The cylindrical member is engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank, and the cylindrical member has an opening at the position of the small-diameter portion and has a shape along the outer shape of the shank. The internal space has substantially the same cross-sectional area with respect to a plane perpendicular to the axial direction of the cylindrical member from the position of the opening to the position of the auxiliary inflow hole.
As still another preferred embodiment, the shank includes a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a taper formed between the large diameter portion and the small diameter portion. And a plurality of the auxiliary inflow holes opened in the tapered portion are arranged in the circumferential direction of the shank, and the cylindrical member has a cylindrical shape (preferably a circular cross section). The cylindrical member is engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank, and the tubular member has a flare shape that opens at the position of the small-diameter portion and gradually expands toward the opening side.
As still another preferred embodiment, the shank includes a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a taper formed between the large diameter portion and the small diameter portion. And a plurality of the auxiliary inflow holes opened in the tapered portion are arranged in the circumferential direction of the shank, and each of the auxiliary inflow holes extends substantially in the direction of the processing point. The cylindrical members are directly connected to each other, and the plurality of cylindrical members are surrounded and held by a cylindrical cover member engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank.
In addition, it is preferable that the said cylindrical member moves to the center axis line direction of the said tool, and can adjust a position.

The auxiliary central axis of the auxiliary inflow hole is inclined at a predetermined angle with respect to the main central axis of the through hole, and the air flowing through the auxiliary inflow hole is inclined along the flow of air flowing through the through hole. It is preferable to flow and join.
The plurality of auxiliary inflow holes are formed side by side in the shank in the circumferential direction (preferably, evenly in the circumferential direction), and the plurality of auxiliary central axes of the auxiliary inflow holes are on the main central axis. It is preferable to intersect at one point.
The auxiliary inflow holes are formed in the shank uniformly in the circumferential direction, and the auxiliary central axes of the auxiliary inflow holes are equally eccentric with respect to the main central axis, and the auxiliary central axis It may be a case where they are different from each other.
Each cross-sectional area of the auxiliary inflow hole is preferably set to a predetermined value corresponding to each cross-sectional area of the main inflow hole.

  Since the tool having the in-tool flow path according to the present invention is configured as described above, chips generated at the machining point where the workpiece is machined by the tool blade portion are assisted by the air flow around the machining point. By guiding it to the inflow hole, the chips can be discharged efficiently without leaving behind, and the chips flow through the tool flow path at an appropriate flow rate regardless of the tool diameter. By the air, the chips are discharged well without accumulating in the tool flow path.

1 to 11 are views showing an embodiment of the present invention, and FIG. 1 is a partial cross-sectional view of a machining center showing a machining state by the tool of the present invention. It is an enlarged view of the tool concerning the 1st example of the present invention. FIG. 3 is a view taken along line III in FIG. 2. It is sectional drawing when the tool shown in FIG. 2 is seen from another direction. It is an enlarged view of the tool concerning the modification of 1st Example, and is a figure equivalent to FIG. FIG. 6 is a view corresponding to FIG. It is an enlarged view of the tool concerning 2nd Example of this invention. It is an enlarged view of the tool concerning the modification of 2nd Example. It is an enlarged view of the tool concerning other modifications of the 2nd example. It is an enlarged view of the tool concerning the further another modification of 2nd Example. It is a XI-XI line arrow line view of FIG.

The blade part is hold | maintained at the shank of the tool which has the flow path in a tool concerning this invention. A flow path in the tool for sucking together with air chips generated when the workpiece is machined by the blade portion is formed inside the tool.
The in-tool flow path includes a through-hole formed in the shank, a blade portion for sucking chips together with air, at least one main inflow hole communicating with the through-hole, and both air and chips. At least one auxiliary inflow hole formed in the shank for communication and communicating with the through hole is provided.
A cylindrical member that opens in the vicinity of a machining point where the workpiece is machined by the blade portion is provided on the shank. The air flows into the auxiliary inflow hole through the internal space of the cylindrical member together with the chips generated at the processing point.
As a result, the chips generated at the machining point where the workpiece is machined with the blade of the tool are guided to the auxiliary inflow hole by the air flow around the machining point, so that the chips can be efficiently left without leaving behind. Regardless of the size of the tool, the air that flows through the flow path in the tool at an appropriate flow rate and sucks the chips is discharged well without being accumulated in the flow path in the tool. The purpose is realized.
The tool having a flow path in the tool according to the present invention includes a rotary tool used for a machine tool such as a lathe, a multi-task machine, a lathe, and a rotary tool in addition to a tool used for a machining center (for example, a rotary tool). It may be a turning tool that does not.

Embodiments according to the present invention will be described below with reference to FIGS.
(First embodiment)
FIG. 1 is a partial cross-sectional view of a machining center showing a machining state with the tools 5, 5a to 5e of the present invention. 2 is an enlarged view of the tool 5 according to the first embodiment, FIG. 3 is a sectional view taken along the line III in FIG. 2, and FIG. 4 is a cross-sectional view of the tool 5 shown in FIG. is there. FIG. 5 is an enlarged view of the tool 5a according to the modification, and corresponds to FIG. 6 is a view taken along the line VI of FIG. 5 and corresponds to FIG.

1 to 6, the machine tool 1 according to this embodiment is a machining center. The spindle head 2 of the machine tool 1 supports the spindle 3 to be rotatable. The tool 5 (or the tool 5a) has an in-tool flow path 4, and is attached to a tool holder 6 that is detachably attached to the main shaft 3. The tools 5 and 5a are rotated to cut the workpiece 8 placed on the table 7.
In the tools 5 and 5a, the shank 20 holds the blade portion 21. The in-tool flow path 4 is formed inside the tools 5 and 5 a in order to suck the chips 22 generated at the processing point B together with the air 23 when the workpiece 8 is processed by the blade portion 21.
The in-tool flow path 4 is formed in the blade portion 21 in order to suck the chip 22 together with the through hole 24 formed in the shank 20 and the air 23, and is connected to the through hole 24 (in this embodiment, in this embodiment). Two main inflow holes 25 and at least one (4 in this embodiment) formed in the shank 20 for sucking chips 22 (or only the air 23) together with the air 23 and communicating with the through holes 24. Two auxiliary inflow holes 26 (or auxiliary inflow holes 26a).

The shank 20 is provided with a cylindrical member 40 that opens in the vicinity of a processing point B where the workpiece 8 is processed by the blade portion 21. The air 23 flows into the auxiliary inflow hole 26 (or the auxiliary inflow hole 26a) from the opening 1 of the cylindrical member 40 located in the vicinity of the processing point B, through the internal space S of the cylindrical member 40.
As a result, a curtain of a flow of air 23 having a high flow velocity is formed so as to surround the periphery of the processing point B. Therefore, the chip 22 generated at the processing point B where the workpiece 8 is processed by the blade portion 21 of the tool 5, 5 a is caused by the curtain of the flow of the air 23 around the processing point B and the opening 41 of the cylindrical member 40. Then, it is guided to the auxiliary inflow hole 26 (or the auxiliary inflow hole 26a) through the internal space S of the cylindrical member 40. Thereby, the chip 22 can be efficiently discharged without leaving the chip 22 at and around the processing point B.

According to the experiments conducted by the present inventors, the wind speed at the tip of the blade portion 21 and the wind speed at a position 10 mm away from the tip of the blade portion when there is no cylindrical member 40 are 3.0 m / s, respectively. It was 1.3 m / s.
In contrast, when the tubular member 40 is provided on the shank 20, the wind speed at the tip of the blade portion 21 and the wind speed at a position 10 mm away from the tip of the blade portion are 5.5 m / s, 2. As a result, when the tubular member 40 is provided on the shank 20, the wind speed of the air flowing through the blade portion 21 and its surroundings is significantly increased.

The air 23 and chips 22 that have flowed through the tool flow path 4 of the tools 5 and 5 a are formed in the flow path 11 in the tool holder 6, the flow path 13 in the draw bar 12 of the spindle 3, the spindle 3, and the spindle head 2. Then, it flows in the order of the discharge flow path 14 and flows into the suction device 15.
The suction device 15 includes a vacuum pump for sucking the air 23 and the chips 22 with the tools 5 and 5a, and a collection device for collecting the chips 22 carried by the air 23. .

When the tool diameter of the tools 5 and 5a is large, the cross-sectional area of the main inflow hole 25 is large, so that the flow rate of the air 23 flowing from the main inflow hole 25 increases. As a result, since the flow velocity of the air 23 including the chips 22 increases through the flow path 4 in the tool and exerts a strong suction force, the chips 22 are discharged well without accumulating in the flow path 4 in the tool. Is done.
However, when the tool diameter of the tools 5 and 5a is small, the cross-sectional area of the main inflow hole 25 is small, and the flow rate of the air 23 flowing in from the main inflow hole 25 is reduced. In general, the cross-sectional area of the through hole 24 is larger than the cross-sectional area of the main inflow hole 25. As a result, the flow velocity of the air 23 and the chips 22 flowing in from the main inflow hole 25 becomes slow in the through holes 24, so that the chips 22 stay in the through holes 24 and easily accumulate.

Therefore, in the present invention, the auxiliary inflow holes 26 and 26a are provided in the shank 20 of the tools 5 and 5a, and the chips 22 are sucked together with the air 23 from the auxiliary inflow holes 26 and 26a. To join.
As a result, the flow velocity of the air 23 in the tool flow path 4 is increased, and an appropriate suction force is exhibited. As a result, the chips 22 that have flowed together with the air 23 from the main inflow hole 25 flow together with the air 23 having a high flow velocity.
Therefore, in the tools 5 and 5a, the chips 22 are accumulated in the tool flow path 4 by the air 23 that flows through the tool flow path 4 at an appropriate flow rate and sucks the chips 22 regardless of the tool diameter. It is discharged well without doing.

The auxiliary center axis CL2 of the auxiliary inflow holes 26 and 26a is inclined with respect to the main center axis CL1 of the through hole 24 by a predetermined angle θ (preferably, angle θ = 10 degrees). The air 23 flowing through the auxiliary inflow holes 26, 26 a (for example, the air 23 including the chips 22) flows obliquely along the flow of the air 23 flowing through the through holes 24 and merges.
In this manner, the auxiliary inflow holes 26 and 26 a are inclined with respect to the through hole 24, and the air 23 and the chips 22 flowing through the auxiliary inflow holes 26 and 26 a smoothly merge with the air flowing through the through hole 24. . Therefore, the possibility that the air 23 flows backward in the through hole 24 is reduced. As a result, there is little possibility that the chips 22 stay in the through hole 24.

In the tool 5 shown in FIGS. 1 to 4, the auxiliary inflow holes 26 are arranged in the shank 20 in the circumferential direction (here, the circumferential direction) (preferably equally in the circumferential direction). 4) formed.
A plurality of auxiliary central axes CL2 of the auxiliary inflow hole 26 intersect at one point P1 on the main central axis CL1. The auxiliary center axis CL2 of the auxiliary inflow hole 26 is usually a straight line, but may be a curved line.
With such a tool 5, the air 23 and the chips 22 flowing through the plurality of auxiliary inflow holes 26 can merge well with the air 23 flowing through the through holes 24. Therefore, there is less risk of backflow or stagnation of the air 23 and the chips 22, and the air 23 and the chips 22 flow through the in-tool flow path 4 in the discharge direction and are smoothly discharged to the outside.
In addition, although the hole diameter of the some auxiliary | assistant inflow hole 26 formed in the tool 5 is generally the same dimension, a different dimension may be sufficient as it. For example, out of the four auxiliary inflow holes 26 that are equally spaced 90 degrees apart, the diameters of the two auxiliary inflow holes 26 that face each other 180 degrees apart are increased, and the remaining two auxiliary holes 26 that face each other 180 degrees apart. You may make the hole diameter of the inflow hole 26 small. The number of auxiliary inflow holes 26 may be two or other plural numbers.

In the tool 5a according to the modification shown in FIGS. 1, 5, and 6, the auxiliary inflow holes 26a are arranged in the circumferential direction (here, in the circumferential direction) on the shank 20 (preferably evenly in the circumferential direction). A plurality (four in this embodiment) are formed.
The plurality of auxiliary central axes CL2 of the auxiliary inflow holes 26a are equally decentered with respect to the main central axis CL1, and the auxiliary central axes CL2 are different from each other. That is, the auxiliary center axis CL2 of each auxiliary inflow hole 26a does not intersect with the main center axis CL1, and the plurality of auxiliary center axes CL2 are neither parallel nor intersect. The auxiliary center axis CL2 of the auxiliary inflow hole 26a is usually a straight line, but may be a curved line.
As described above, in the tool 5a, the plurality of auxiliary central axes CL2 of the auxiliary inflow holes 26a are evenly decentered with respect to the main central axis CL1, and the auxiliary central axes CL2 are different from each other. As a result, when the air 23 and the chips 22 flowing through the plurality of auxiliary inflow holes 26 a flow out to the through hole 24 and merge with the air 23 flowing through the through hole 24, a swirling vortex is generated in the through hole 24.
Then, the chip 22 carried by the air 23 is sucked into the through hole 24 by this vortex, flows in the discharge path 4 in the tool, and is smoothly discharged to the outside. In this way, a swirl-like vortex is generated in the in-tool flow path 4 and this vortex moves downstream, so that a suction force by the vortex is applied, and there is a possibility that the air 23 and the chips 22 may flow backward or stay. Less.
In addition, although the hole diameter of the some auxiliary | assistant inflow hole 26a formed in the tool 5a is usually the same dimension, a different dimension may be sufficient as it. For example, among the four auxiliary inflow holes 26a that are equally spaced 90 degrees apart, the diameters of the two auxiliary inflow holes 26a that face each other 180 degrees apart are increased, and the remaining two auxiliary holes 26 that face each other 180 degrees apart. You may make the hole diameter of the inflow hole 26a small. The number of auxiliary inflow holes 26a may be two or other plural numbers.

As yet another modification, even if the auxiliary inflow hole 26 of the tool 5 and the auxiliary inflow hole 26a of the tool 5a are combined to form a plurality of (for example, four in total) auxiliary inflow holes. Good.
For example, of the four auxiliary inflow holes in total, the two auxiliary inflow holes 26 facing each other are formed 180 degrees apart in the circumferential direction (here, in the circumferential direction) in the shank 20. The center axis CL2 intersects at one point P1 on the main center axis CL1.
The remaining two auxiliary inflow holes 26a are formed 180 degrees apart in the circumferential direction (here, in the circumferential direction) in the shank 20, and the two auxiliary central axes CL2 of the auxiliary inflow holes 26a are the main central axis CL1. The auxiliary central axes CL2 are offset from each other evenly. That is, the auxiliary center axis CL2 of each auxiliary inflow hole 26a does not intersect with the main center axis CL1, and the two auxiliary center axes CL2 are neither parallel nor intersect.
If it is such a tool, there exists the same effect as the tools 5 and 5a.

  In the tools 5 and 5 a shown in FIGS. 1 to 6, the auxiliary inflow holes 26 and 26 a are as close as possible to the blade portion 21 in order to prevent the chips 22 from staying in the through hole 24 of the small diameter portion 30. Has been placed. Thereby, there is no possibility that the chips 22 sucked from the main inflow hole 25 are accumulated in the through holes 24 of the small diameter portion 30 having a cross-sectional area wider than that of the main inflow hole 25.

The shank 20 has a small diameter portion 30 to which the blade portion 21 is attached, a large diameter portion 31 to be attached to the tool holder 6, and a tapered portion 32 formed between the large diameter portion 31 and the small diameter portion 30. doing.
A plurality (four in this embodiment) of auxiliary inflow holes 26, 26a opening in the tapered portion 32 are arranged in the circumferential direction (here, the circumferential direction) of the shank 20 (preferably, evenly in the circumferential direction). ) Is arranged.
In this way, the opening 27 of the auxiliary inflow holes 26 and 26 a is arranged in the tapered portion 32. Accordingly, when the auxiliary inflow holes 26 and 26a are formed in the shank 20, the auxiliary inflow holes 26 and 26a can be formed from a direction substantially perpendicular to the surface of the tapered portion 32 or a direction close thereto. Work is easy.

Each cross-sectional area of the auxiliary inflow holes 26 and 26 a is set to a predetermined value corresponding to each cross-sectional area of the main inflow hole 25. Thereby, according to the tool diameter of the tools 5 and 5a, the flow volume of the air 23 which flows in from the auxiliary inflow holes 26 and 26a can be set appropriately.
Therefore, the suction force for sucking the chips 22 is made appropriate by the flow velocity of the air flowing through the tool flow path 4, and the chips 22 are discharged well without accumulating in the tool flow path 4.

Next, the operation of the machine tool 1 will be described with reference to FIGS.
The tools 5 and 5 a of the tool holder 6 are rotated by the spindle 3 attached to the spindle head 2. The workpiece 8 placed on the table 7 is in a non-rotating state. At this time, the suction device 15 is set in an operating state in advance.
By driving the suction device 15, the air 23 is sucked from the two main inflow holes 25 of the blade portion 21.
The opening 41 of the tubular member 40 is located in the vicinity of the machining point B where the workpiece 8 is machined by the blade 21. Accordingly, the air 23 flows in the vicinity of the processing point B at high speed, and then enters the internal space S of the cylindrical member 40 and is sucked from the four auxiliary inflow holes 26 (or auxiliary inflow holes 26a) of the shank 20. The
Then, the air 23 exits from the two main inflow holes 25 and the four auxiliary inflow holes 26 (or the auxiliary inflow holes 26a), passes through the through holes 24 of the shank 20, and then the flow path 11, It flows in the order of the flow path 13 and the discharge flow path 14 of the draw bar 12 and is discharged to the outside by the suction device 15.

In this state, when the tools 5 and 5a are moved in the three orthogonal directions (X axis, Y axis and Z axis) relative to the workpiece 8, the workpiece 8 is cut by the rotating tools 5 and 5a. Processed. When the workpiece 8 is cut by the blade 1, chips 22 are generated at the processing point B.
Chips 22 generated at the processing point B when machining the workpiece 8 with the blade 21 are sucked together with the air 23 from the main inflow hole 25 of the blade 21 and pass through the main inflow hole 25 to form the shank 20. It enters the through hole 24.
In addition, during the time when the cutting operation is not performed on the workpiece 8, the chips 22 are not temporarily generated in the blade portion 21 of the tools 5 and 5a. At this time, since the amount of chips 22 contained in the air 23 sucked from the main inflow hole 25 is small or zero, only the air 23 passes through the main inflow hole 25.

A part of the chip 22 generated at the processing point B when the workpiece 8 is processed by the blade portion 21 passes through the internal space S of the cylindrical member 40 together with the air 23, and is sucked from the auxiliary inflow holes 26 and 26a. It penetrates into the through hole 24 of the shank 20 through the auxiliary inflow holes 26 and 26a.
The opening of the cylindrical member 40 is positioned in the vicinity of the processing point B. As a result, the curtain of the flow of air 23 is formed so as to surround the processing point B. Therefore, the chips 22 generated at the processing point B where the workpiece 8 is processed by the blade portion 21 of the tools 5 and 5a are blocked by the curtain of the flow of air 23 around the processing point B. It enters the inside of the cylindrical member 40 from the opening 1 of the cylindrical member 40 without scattering in the direction.
Thereafter, the air 23 and the chips 22 are guided to the auxiliary inflow hole 26 (or the auxiliary inflow hole 26a) through the internal space S of the cylindrical member 40. As a result, the chips 22 are efficiently discharged without remaining around the processing point B and its periphery.
Depending on the processing conditions, the chip 22 may not be included in the air 23 flowing through the auxiliary inflow holes 26 and 26a.

Next, after the chips 22 flow into the through hole 24 of the shank 20 together with the air 23, the chips 22 ride on the flow of the air 23 in the order of the flow path 11 of the tool holder 6, the flow path 13 of the draw bar 12, and the discharge flow path 14. After flowing, it is collected by the suction device 15.
Since the chips 22 are not included in the air discharged from the suction device 15, the discharged air is clean.

In the tools 5 and 5 a, the cross-sectional area of the through hole 24 is larger than the cross-sectional area of the main inflow hole 25. Therefore, when the air 23 and the chip 22 flow into the through hole 24 from the main inflow hole 25, the flow velocity of the air 23 and the chip 22 becomes slow.
However, the air 23 (that is, the air 23 that may include the chips 22) is sucked separately from the main inflow holes 25 from the auxiliary inflow holes 26 and 26 a. Therefore, the flow velocity of the air 23 (air 23 that may contain the chips 22) flowing into the through-hole 24 from the main inflow hole 25 is immediately changed from a low speed to a high speed and exhibits a strong suction force. As a result, the chips 22 contained in the air 23 can flow well downstream without being retained in the through holes 24.

(Second embodiment)
FIG. 7 is an enlarged view of a tool 5b according to a second embodiment of the present invention, FIG. 8 is an enlarged view of a tool 5c according to a modification of the second embodiment, and FIG. 9 is another modification of the second embodiment. 10 is an enlarged view of the tool 5d according to the example, FIG. 10 is an enlarged view of the tool 5e according to still another modified example of the second embodiment, and FIG. 11 is a view taken along the line XI-XI in FIG.

Each of the tools 5b to 5e shown in FIGS. 7 to 10 is a relatively small diameter tool. Inside the tools 5b to 5e, an in-tool flow path 4 is formed. The in-tool flow path 4 is a flow path for sucking chips 22 generated together with the air 23 when the blade portion 21 is held by the shank 20 b and the workpiece 8 is processed by the blade portion 21.
The in-tool flow path 4 formed in the tools 5 b to 5 e is formed in the blade portion 21 for sucking the chip 22 together with the through hole 24 formed in the shank 20 b and the air 23, and communicates with the through hole 24. At least one main inflow hole 25 and at least one auxiliary inflow hole 26 formed in the shank 20 b for sucking the chips 22 together with the air 23 and communicating with the through hole 24 are provided.

Since the tools 5b to 5e are all small-diameter tools, the auxiliary inflow hole 26 is located away from the processing point B where the workpiece 8 is processed by the blade portion 21. Therefore, cylindrical members 40b, 40c, 40d, and 40e that open in the vicinity of the processing point B are provided in the shank 20b. The cylindrical members 40b to 40e are made of plastic or metal. The air 23 flows into the auxiliary inflow hole 26 through the internal space S of the cylindrical members 40b to 40e together with the chips 22 generated at the processing point B.
As a result, a curtain of air 23 is formed so as to surround the processing point B. Therefore, the chips 22 generated at the processing point B where the workpiece 8 is processed by the blade portion 21 of the tools 5b to 5e are caused by the curtain of the flow of the air 23 around the processing point B, so that the cylindrical members 40b, 40c, 40d. , 40e through the internal space S of the tubular member from the openings 41b, 41c, 41d, 41e. Thereby, the chip 22 can be efficiently discharged without leaving the processing point B and its surroundings.

In the tool 5b shown in FIG. 7, the shank 20b includes a small diameter portion 30 to which the blade portion 21 is attached, a large diameter portion 31 to be attached to the tool holder 6 (FIG. 1), and the large diameter portion 31 and the small diameter portion 30. And a tapered portion 32 formed therebetween. A plurality of auxiliary inflow holes 26 opening in the tapered portion 32 are arranged side by side in the circumferential direction of the shank 20b.
The tools 5c, 5d, and 5e shown in FIGS. 8, 9, and 10 also have the same shank 20b, blade portion 21, and auxiliary inflow hole 26 as the tool 5b.
In the tool 5b, the cylindrical member 40b has a cylindrical shape with the same diameter in the axial direction, and is engaged and fixed to the outer peripheral surface of the large-diameter portion 31 of the shank 20b. Since the tool 5b is a small-diameter tool, the auxiliary inflow hole 26 is located away from the processing point B. However, since the cylindrical member 40b is provided, the chip 22 is sucked at a location close to the processing point B. Can be done effectively.

In the tool 5c shown in FIG. 8, the cylindrical member 40c is engaged with and fixed to the outer peripheral surface of the large-diameter portion 31 of the shank 20b in a cylindrical shape.
The cylindrical member 40c has a shape that opens at the position of the small diameter portion 30 and that conforms to the outer shape of the shank 20b. The internal space S of the cylindrical member 40c has substantially the same cross-sectional area with respect to the plane orthogonal to the axial direction of the cylindrical member 40c from the position of the opening 41c to the position of the auxiliary inflow hole 26.
As a result, the air 23 that has entered the cylindrical member 40 c through the opening 41 c of the cylindrical member 40 c flows into the auxiliary inflow hole 26 after flowing through the internal space S at substantially the same wind speed. Accordingly, the chips 22 contained in the air 23 also flow into the auxiliary inflow hole 26 satisfactorily on the flow of the air 23 in the internal space S without accumulating on the way.

In the tool 5d shown in FIG. 9, the cylindrical member 40d is engaged with and fixed to the outer peripheral surface of the large-diameter portion 31 of the shank 20b in a cylindrical shape. The cylindrical member 40b has a flare shape that opens at the position of the small diameter portion 30 and gradually expands toward this opening side. Here, the “flare shape” is a shape corresponding to the spread of the morning glory at the bottom of the clothes.
Since the opening 41d of the tubular member 40d is wide, the chips 22 scattered around the processing point B are efficiently collected by the flow of the wind 23 around the processing point B toward the opening 41d. The wind 23 and the chips 22 flow into the auxiliary inflow hole 26 after flowing through the internal space S of the cylindrical member 40d.

In the tool 5e shown in FIGS. 10 and 11, each auxiliary inflow hole 26 is directly connected to a pipe-shaped tubular member 40e extending substantially in the direction of the processing point B. These plural (here, four) cylindrical members 40e are surrounded and held by a cylindrical cover member 42 engaged and fixed to the outer peripheral surface of the large-diameter portion 31 of the shank 20b.
Since the cover member 42 is provided, the plurality of cylindrical members 40e can be firmly pressed and positioned so as not to move.
The gaps between the inner peripheral surface of the cover member 42, the outer peripheral surface of the small diameter portion 30, and the plurality of tubular members 40 e are closed by a lid member 43 provided at the end of the cover member 42. Therefore, there is no possibility that the chips 22 enter the gap.
In the tool 5e, by adjusting the shape and the number of the cylindrical members 40e and adjusting the air volume and the air speed of the wind 23 flowing around the processing point B, the efficiency of discharging the chips 22 is set to an optimum state. be able to.

In the tools 5, 5 a to 5 e shown in FIGS. 1 to 10, the cylindrical members 40, 40 b to 40 e are moved in the central axis direction of the tools 5, 5 a to 5 e so that the position can be adjusted.
For example, the cylindrical members 40, 40b to 40e may be made of plastic, and the cylindrical members 40, 40b to 40e may be brought into close contact with the shank 20, 20b using the elasticity of the plastic. In this case, if the cylindrical members 40, 40b to 40e are pulled in the central axis direction of the tool against their elasticity, the cylindrical members 40, 40b to 40e can be moved and adjusted.

As an example, in the drilling of the workpiece 8, the blade portion 21 of the machining tool may go deep into the workpiece. In such a tool, it is preferable to adjust the position of the cylindrical members 40, 40 b to 40 e so as to move to positions away from the blade portion 21.
In this way, the chip 22 generated at the processing point B due to the rotation operation of the blade portion 21 enters the internal space S of the cylindrical members 40, 40b to 40e through the inside of the hole together with the air 23, and then assists. It flows into the inflow hole 26.
Since the cylindrical members 40, 40b to 40e can be adjusted in position, and the cylindrical members 40, 40b to 40e are located away from the blade portion 21, the cylindrical members 40, 40b to 40e are disposed at the blade portion. The processing operation by 21 is not disturbed.

On the other hand, in the processing of the surface and side surfaces of the workpiece 8, the blade portion 21 of the tool for processing does not enter deeply into the workpiece. In such a tool, it is preferable to adjust the position of the cylindrical members 40, 40b to 40e so as to be moved to a position adjacent to the blade portion 21.
By doing so, the chips 22 generated at the processing point B by the blade portion 21 immediately enter the internal space S of the cylindrical members 40, 40 b to 40 e together with the air 23, and then flow into the auxiliary inflow hole 26.
Since the cylindrical members 40, 40b to 40e can be adjusted in position, and the cylindrical members 40, 40b to 40e are located beside the blade portion 21, the chips 22 generated at the processing point B are located around the periphery. Without being scattered, it is immediately sucked into the cylindrical members 40, 40b to 40e together with the air 23.
In this way, by adjusting the positions of the cylindrical members 40, 40b to 40e according to the type of processing, the type of tool, etc., an optimum tool for efficiently discharging without leaving any chips afterwards is obtained. be able to.

Although the embodiments of the present invention (including modifications, the same applies hereinafter) have been described above, the present invention is not limited to the above-described embodiments, and various modifications, additions, and the like are within the scope of the present invention. Is possible.
In the drawings, the same reference numerals denote the same or corresponding parts.

  The configuration of the tool having the in-tool flow path according to the present invention includes a rotating tool used for a machine tool such as a lathe, a multi-tasking machine, and a lathe in addition to a tool used for a machining center, a turning tool that does not rotate, and the like. It is applicable to.

4 Flow path in tool 5, 5 a to 5 e Tool 6 Tool holder 8 Work piece 20, 20 b Shank 21 Blade part 22 Chip 23 Air 24 Through hole 25 Main inflow hole 26, 26 a Auxiliary inflow hole 30 Small diameter part 31 Large diameter part 32 Taper part 40, 40b-40e Cylindrical member 41c Opening part 42 Cover member B Processing point

Claims (6)

A tool in which a blade portion is held by a shank and a flow path in the tool for sucking together with air chips generated when machining a workpiece with the blade portion,
The flow path in the tool formed in this tool is
A through hole formed in the shank;
At least one main inflow hole formed in the blade portion for sucking the chips together with the air and communicating with the through hole;
At least one auxiliary inflow hole formed in the shank for sucking the chips together with the air and communicating with the through hole;
A cylindrical member that opens in the vicinity of a machining point for machining the workpiece with the blade portion is provided in the shank,
The tool having a flow path in the tool, wherein the air flows into the auxiliary inflow hole through the internal space of the cylindrical member together with the chips generated at the processing point. The shank has a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion,
A plurality of the auxiliary inflow holes opening in the tapered portion are arranged side by side in the circumferential direction of the shank,
2. The in-tool flow path according to claim 1, wherein the cylindrical member has a cylindrical shape with the same diameter in the axial direction, and is engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank. Tool with The shank has a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion,
A plurality of the auxiliary inflow holes opening in the tapered portion are arranged side by side in the circumferential direction of the shank,
The tubular member is tubularly engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank,
The tubular member has an opening at the position of the small diameter portion and a shape along the outer shape of the shank;
The internal space of the cylindrical member has substantially the same cross-sectional area with respect to a plane orthogonal to the axial direction of the cylindrical member from the position of the opening to the position of the auxiliary inflow hole. The tool which has a flow path in a tool of 1. The shank has a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion,
A plurality of the auxiliary inflow holes opening in the tapered portion are arranged side by side in the circumferential direction of the shank,
The tubular member is tubularly engaged and fixed to the outer peripheral surface of the large-diameter portion of the shank,
The tool having a flow passage in the tool according to claim 1, wherein the cylindrical member has a flare shape that opens at the position of the small diameter portion and gradually expands toward the opening side. . The shank has a small diameter portion to which the blade portion is attached, a large diameter portion to be attached to a tool holder, and a tapered portion formed between the large diameter portion and the small diameter portion,
A plurality of the auxiliary inflow holes opening in the tapered portion are arranged side by side in the circumferential direction of the shank,
Each auxiliary inflow hole is directly connected to each of the pipe-shaped cylindrical members extending substantially in the direction of the processing point,
2. The inside of the tool according to claim 1, wherein the plurality of cylindrical members are surrounded and held by a cylindrical cover member engaged and fixed to an outer peripheral surface of the large-diameter portion of the shank. A tool having a flow path.   The tool having a flow path in a tool according to any one of claims 1 to 5, wherein the cylindrical member is movable in a central axis direction of the tool and can be adjusted in position.

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