JP3011303B2 - Spindle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tool for clamping and unclamping a tool by moving a drawing bolt.
The present invention relates to a spindle device configured to supply a coolant through a main passage provided on a shaft of a drawing bolt.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 54-14878 discloses that
A coolant supply device configured to supply coolant and air through a through hole provided in a drawing bolt is disclosed.

[0003] The coolant is supplied to the tool and the workpiece at the time of machining, and performs a cooling action, a wear preventing action, and the like. on the other hand,
The air is supplied when the tool is unclamped, and acts to prevent chips and the like from adhering to the shank portion of the tool holder and the tool holder supporting portion of the spindle, thereby improving the tool mounting accuracy.

[0004]

In the above-described coolant supply apparatus, a through hole for supplying coolant and air is common throughout the entire path. The outlet is also common, and both coolant and air are discharged from a common outlet on the shaft.

[0005] A hole for passing a coolant is provided on the axis of the tool holder, and the coolant discharged from the outlet is supplied to the tool and the work through the hole of the tool holder. Air is also discharged from the common outlet with the coolant along the axis.

However, the shank portion of the tool holder to be cleaned and the tool holder supporting portion of the spindle do not exist on the axis, but extend on the circumference surrounding the axis. For this reason, the cleaning operation by air is inefficient, and the setting accuracy of the tool may be insufficient.

[0007] In view of such problems of the prior art, an object of the present invention is to provide a spindle device that can efficiently clean a shank portion of a tool holder using air.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a spindle device having a configuration in which a drawing bolt is moved to clamp and unclam a tool and a coolant is supplied through a main passage provided on a shaft center of the drawing bolt.
An openable / closable coolant passage (24) is provided on an extension of the main passage (17), and an air passage (20) that can be selectively connected to the main passage (17) is provided around the coolant passage (24). To open and close the first valve (2
2), and a second valve (21) for selectively connecting the air passage (20) and the main passage (17). When the tool is clamped, the first valve (22) is opened and the coolant passage ( 24) is opened and the second valve (21) is closed to cut off the connection between the air passage (20) and the main passage (17), and when the tool is unclamped, the first valve (22) is closed and the coolant is closed. The passage (24) is closed and the second valve (21) is opened to connect the air passage (20) to the main passage (17). The first valve (22) is provided with a valve body (26). ), Valve seat (28) and spring (2)
5), wherein a valve body (26) is provided in a coolant passage (24) formed inside an inner sleeve (2 3 ) located on an extension of the drawing bolt (14). It is arranged movably,
The valve seat (28) is formed in the interior of the inner sleeve (2 3), the collet outwardly of the inner sleeve (2 3) (15) is disposed, the collet (15 on the outside of the collet (15) ) And an inner sleeve (23), an outer sleeve (19) is arranged, and a part of an air passage (20) is formed inside the outer sleeve (19). Collet (15) by passing through passage (20)
And a member having a foot (2
7) is provided at the front end of the valve body (26), and the tip of the foot abuts on the end face of the tool holder (16) when clamped to open the first valve (22) , and when unclamped, the valve body ( 26) acts on the valve seat (28) by the action of the spring (25).
And the first valve (22) is closed by being pressed against the main shaft device.

[0009]

When the tool is clamped, the first valve 22
Opens, and the second valve 21 closes. Coolant passage 24
Is released, and the connection between the main passage 17 and the air passage 20 is cut off. At this time, the coolant can be supplied through the main passage 17 and the coolant passage 24 to process the work. When the processing is completed and the tool is unclamped, the first valve 22 closes and the second valve 21 opens. That is, the coolant passage 24 is closed, and the main passage 17 and the air passage 20 communicate with each other. If air is supplied through the main passage 17 and the air passage 20 immediately before clamping a new tool, the shank portion of the tool holder and the tool holder supporting portion of the spindle can be effectively cleaned.

Further, the first valve 22 is of a slide type comprising a valve body 26, a valve seat 28 and a spring 25, and the valve body (26) is formed of an inner sleeve (2 3 ).
The valve body (26) is provided movably in a coolant passage (24) formed therein, and a member (27) having a foot is provided at a front end of the valve body (26). The first valve contacts the end face of the tool holder 16
Is released. Therefore, by the action of the foot,
A sufficiently large flow path can be secured. At the time of unclamping, the valve body is pressed against the valve seat 28 by the action of the spring 25 so that the first
Valve 22 is closed. Therefore, the first valve 22 is reliably opened and closed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of a spindle device of the present invention,
2 and 3 are enlarged sectional views showing a part of the spindle device in a clamped state and an unclamped state, respectively. FIG.
Is a sectional view taken along the line AA in FIG. 2, and FIG. 5 is a block diagram showing the flow of coolant and air. In FIG. 1, hatching indicating a cross section is omitted for easy viewing.

The spindle device 10 of the present invention has a feature in a coolant and air supply system, and other configurations can employ the configuration of the spindle device in a normal machining center as it is. Therefore, the following description focuses on the coolant and air supply system.

The spindle device 10 has a spindle 11 which can be driven at high speed. Spindle 11 is bearing 12
And is installed in the bearing housing 13 via the.

The spindle 11 has a through hole on its axis, and a tapered portion for supporting the tool holder is formed at the tip of the through hole. A drawing bolt 14 is inserted into the through hole. A large number of disc springs 18 are inserted in the space between the spindle 11 and the drawing bolt 14. The disc spring 18 presses the drawing bolt 14 backward. A main passage 17 is provided on the axis of the drawing bolt 14, and a coolant supply means 31 and an air supply means 32 (see FIG. 5) are provided at the downstream end (not shown).
Are connected in parallel. A mechanism (not shown) for pushing out the drawing bolt 14 against the spring force of the disc spring 18 is provided behind the drawing bolt 14.

A tubular inner sleeve 23 is hermetically connected to a leading end of the drawing bolt 14. A collet 15 for gripping the tool holder is supported at the tip of the inner sleeve 23 .
A coolant passage 24 is provided on the axis of the inner sleeve 23.
Are formed. The coolant passage 24 is located on an extension of the main passage 17.

An outer sleeve 19, which is longer than the inner sleeve 23, is disposed outside the inner sleeve 23. The outer sleeve 19 is located in the through hole of the spindle, and extends from the tip of the disc spring 18 to the tapered portion of the spindle. Inside the outer sleeve,
Tip of drawing bolt 14, inner sleeve 2
3. The collet 15 is disposed so as to be slidable in the axial direction. From the clamped state in FIG.
When the collet 15 moves forward by the stroke width B, the tip of the collet 15 opens as shown in FIG.

The outer sleeve 19 has an air passage 20b.
Are formed. The air passage 20 b extends from the inner periphery of the outer sleeve 19 near the rear to the front end surface of the outer sleeve 19. The opening at the front end face is the air discharge port 2.
0c. Near the front end of the drawing bolt 14, an air passage 20a that is paired with the air passage 20b is formed. The air passages 20a and 20b constitute the air passage 20, and both can selectively communicate with each other. That is, when the drawing bolt 14 is at the unclamping position as shown in FIG. 3, the air passages 20a and 20b communicate with each other. And
The connection between the two is cut off in the clamped state shown in FIG. Thus, the air passages 20a and 20b constitute a kind of valve.

That is, the air passage 20a of the drawing bolt 14 and its periphery, and the rear end portion of the air passage 20b of the outer sleeve and its periphery constitute a slide type valve 21. The valve 21 is closed when the tool is clamped, and the air passage 20 and the main passage 17 do not communicate with each other. The valve 21 is opened at the time of unclamping, and the air passage 20 is opened.
And the main passage 17 communicate with each other.

Incidentally, for example, eight air passages can be provided at equal intervals in the circumferential direction.

On the other hand, near the front end of the coolant passage 24 of the inner sleeve 23, a valve 22 for opening and closing the coolant passage 24 is provided. The valve 22 is also of a slide type and includes a valve body 26, a valve seat 28, and a spring 25. A member 2 having a U-shaped cross section is provided at the front end of the valve body 26.
2, the tip of the foot abuts against the end face of the tool holder 16 during clamping as shown in FIG. 2 to secure a sufficiently large flow path. A plurality of grooves 26a serving as coolant passages are formed in the large diameter portion of the valve body 26. As shown in FIG. 3, at the time of unclamping, the valve body 26
By the action of 5, the valve 22 is pressed against the valve seat 28 of the inner sleeve 23, and the valve 22 is closed.

Next, the operation of supplying coolant and air in the spindle device 10 will be described.

When the tool is clamped as shown in FIG. 2, the end face of the tool holder 16 pushes the U-shaped member 27 and the valve body 26 backward against the spring force, and the valve body 26 floats from the valve seat 28. The valve 22 opens. On the other hand, the valve 21
Is closed because the air passages 20a and 20b do not communicate with each other. In this state, the coolant supply means 31 is operated to supply the coolant to the tool and the work via the main passage 17 in the drawing bolt, the coolant passage 24 in the inner sleeve, the groove 26a of the valve body, and the passage 16a in the tool holder.

On the other hand, when the tool is unclamped as shown in FIG. 3, the valve body 26 is pressed against the valve seat 28 by the action of the spring 25, and the valve 22 is closed. Therefore, the coolant passage 24 is closed. On the other hand, the valve 21 is opened, and the air passages 20a and 20b communicate with each other. As a result, the main passage 17 and the air passage 20 are connected. In this state, the air supply means 3
2 is operated to discharge air from the air discharge port 20c through the main passage 17 and the air passage 20.

In the spindle device of the present invention, an openable / closable coolant passage 24 is provided on an extension of the main passage 17, and an air passage 20 which can be selectively connected to the main passage 17 is provided therearound to open / close the coolant passage 24. And a second valve 21 for selectively connecting the air passage 20 and the main passage 17 is provided. When the tool is clamped, the first valve 22 opens to open the coolant passage 24, and The second valve 21 is closed to cut off the connection between the air passage 20 and the main passage 17, and when the tool is unclamped, the first valve 22 is closed to close the coolant passage 24 and the second valve 21 is opened to open the air Passage 20 and main passage 17
Are connected. Therefore, the work can be processed while supplying the coolant through the main passage 17 and the coolant passage 24 at the time of clamping. At the time of unclamping, air can be supplied through the main passage 17 and the air passage 20 to clean the shank portion of the tool holder and the tool holder supporting portion of the spindle.
At this time, since the air passage 20 is disposed around the coolant passage 24, the air flow is discharged from a circumferential position surrounding the axis of the spindle. Therefore, it is possible to effectively clean the shank portion of the tool holder and the support portion of the spindle, which are spread circumferentially around the axis. Moreover, valve seat 2
8 is formed in the interior of the inner sleeve 2 3 positioned on the extension of the draw bolt 14, and the collet 15 is disposed on the outside of the inner sleeve 2 3,
An outer sleeve 19 is arranged outside the collet 15 so as to surround the collet and the inner sleeve,
A part of the air passage 20 is formed inside the outer sleeve 19, and the air is discharged by bypassing the collet 15 by passing through the air passage.
The flow of the exhaust air is very effective for cleaning.

The valve body (26) is connected to the inner sleeve (2).
3 ) A member (27) having a foot is provided at a front end of the valve body (26) so as to be movable in a coolant passage (24) formed in the inside of the valve body. the in the time of clamping contact with the end face of the tool holder 16 equivalents 1
Valve 22 is released. Therefore, a flow path of a sufficient size can be secured by the action of the foot. At the time of unclamping, the valve body is pressed against the valve seat 28 by the action of the spring 25.
The first valve 22 is closed. Therefore, the first valve 2
2 is reliably opened and closed.

The present invention is not limited to the above embodiment. For example, the air discharge port can be formed seamlessly over the entire circumference. Further, an air passage may be arranged so that air is swirled around the axis and discharged.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a spindle device of the present invention.

FIG. 2 is an enlarged sectional view showing a clamped state of the spindle device of FIG. 1;

FIG. 3 is an enlarged sectional view showing an unclamped state of the spindle device of FIG. 1;

FIG. 4 is a sectional view taken along the line AA of FIG. 2;

FIG. 5 is a block diagram showing flows of coolant and air in the spindle device of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 Main spindle device 11 Spindle 14 Drawing bolt 16 Tool holder 17 Main passage 19 Outer sleeve 20a, 20b Air passage 20c Air discharge port 21, 22 Valve 23 Inner sleeve 31 Coolant supply means 32 Air supply means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-8450 (JP, A) JP-A-64-46149 (JP, U) JP-A-4-51349 (JP, U) JP-A-5-49 44406 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 11/00 B23Q 11/10

Claims (1)

(57) [Claims] In a spindle device having a configuration in which a drawing bolt is moved to perform clamping and unclamping of a tool and supply coolant through a main passage provided on an axis of the drawing bolt, an extension of a main passage (17) is provided. A coolant passage (24) that can be opened and closed is provided in the air passage (24), an air passage (20) that can be selectively connected to the main passage (17) is provided around the coolant passage (24), and a first valve ( 22), and a second valve (21) for selectively connecting the air passage (20) and the main passage (17). When the tool is clamped, the first valve (22) opens to open the coolant passage ( 24) is opened and the second valve (21) is closed to cut off the connection between the air passage (20) and the main passage (17), and the first valve is opened when the tool is unclamped. The valve (22) is closed, the coolant passage (24) is closed, and the second valve (21) is opened to connect the air passage (20) and the main passage (17). Reference numeral 22) denotes a slide type comprising a valve body (26), a valve seat (28), and a spring (25), and the valve body (26) is located on an extension of the drawing bolt (14). Sleeve (2 3 )
The valve seat (28) is formed inside the inner sleeve (2 3 ), and is movably disposed in a coolant passage (24) formed inside the inner sleeve (2 3 ). A collet (15), and an outer sleeve (19) is arranged outside the collet (15) so as to surround the collet (15) and the inner sleeve (23), and the outer sleeve (19). A part of an air passage (20) is formed inside the air passage, and the air is discharged by bypassing the collet (15) by passing through the air passage (20); (27) is provided at the front end of the valve body (26), that when the tip of the foot clamping the first valve in contact with the end face of the tool holder (16) This (22) is released to open <br/>, Ankh Pump at the time of the valve body (26) spring (2
The first valve is pressed against the valve seat (28) by the action of 5).
(22) The main spindle device, wherein the main shaft device is closed.