Gear cutting – milling – or planing – Milling – With means to control temperature or lubricate
Patent
1995-11-02
1997-08-26
Howell, Daniel W.
Gear cutting, milling, or planing
Milling
With means to control temperature or lubricate
408 56, 409137, 409233, B23Q 1110
Patent
active
056605102
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a spindle device which is so designed that a drawing bolt is moved to clamp and unclamp a tool, and a coolant is supplied through a main passage provided along a diametrically central part of the drawing bolt.
BACKGROUND ART
Japanese Patent Laid-Open Publication No. 54-114878 discloses a coolant supply device in which a coolant and air is supplied through a through-hole provided in a drawing bolt.
A coolant is supplied to a tool and a work during working to provide a cooling action, an abrasion preventive action and the like. On the other hand, air is supplied when the tool is unclamped to prevent chips or the like from adhering to a shank portion of a tool holder and a tool holder support portion of a spindle, thus enhancing the mounting accuracy of the tool.
In the aforementioned coolant supply device, the through-hole through which a coolant and air are supplied is used in common over the whole channel. An outlet is also used in common, and both the coolant and air are discharged out of the common outlet on the diametrically central part.
A hole for allowing a coolant to flow is provided on the diametrically central part of the tool holder, and the coolant moved out of the outlet is supplied to the tool and the work through the hole of the tool holder. The air as well as the coolant are discharged along the diametrically central part from the common outlet.
The shank portion of the tool holder and the tool holder support portion of the spindle to be cleaned are not present on the diametrically central part but are spread on the circumference encircling the diametrically central part. Because of this, it sometimes occurred that the cleaning operation by way of air discharged is not sufficient so that a improper setting of the tool is brought forth.
SUMMARY OF THE INVENTION
In view of the problem as noted above with respect to prior art, it is an object of the present invention to provide a spindle device which can selectively supply a coolant and air and can efficiently clean a tool holder shank portion with air.
The present invention provides a spindle device in which a drawing bolt is moved to clamp and unclamp a tool, and a coolant is supplied through a main passage provided on a diametrically central part of the drawing bolt. This arrangement is characterized in that a coolant passage 26, capable of being selectively connected to a main passage 17, is provided at downstream of the main passage 17, an air passage 32, capable of being selectively connected to the main passage 17, is provided externally of the coolant passage 26. A first open-close means 20 is provided between the main passage 17 and the coolant passage 26, and a second open-close means 30 is provided between the main passage 17 and the air passage 32, whereby, when the tool is clamped, the first open-close means 20 is opened to connect the main passage 17 with the coolant passage 26 and the second open-close means 30 is closed to cut-off the connection between the main passage 17 and the air passage 32 whereas when the tool is unclamped, the first open-close means 20 is closed to cut-off the connection between the main passage 17 and the coolant passage 26 and the second open-close means 30 is opened to connect the main passage 17 with the air passage 32.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view showing main portions of a spindle device according to the present invention, an upper side of a center line showing a clamped state whereas a lower side thereof showing an unclamped state.
FIG. 2 is an enlarged sectional view showing the clamped state of the spindle device of FIG. 1.
FIG. 3 is an enlarged sectional view showing the unclamped state of the spindle device of FIG. 1.
FIG. 4 is a block diagram showing a flow of a coolant and air in the spindle device of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
When a drawing bolt (bar) is actuated to clamp a tool, a first open-close means 20 is opened and a second open-close means 30 is closed. That is, a co
REFERENCES:
patent: 4951578 (1990-08-01), von Haas et al.
patent: 5039261 (1991-08-01), Takada
patent: 5174692 (1992-12-01), Martin
Taniguchi Katsuji
Yamada Shigeru
Howell Daniel W.
Kananen Ronald P.
Kitamura Machinery Co. Ltd.
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