JP2002059334A - Dustproof device of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent chips from entering the lower side of a pallet by forming a dustproof curtain of cutting fluid outside a clamper. SOLUTION: Cutting fluid passages 6B and 6C are formed in a turntable 3 and the pallet 4. A pipe 15 for connecting the passages 6B and 6C in a connecting/disconnecting manner is provided in the clamper 5. A nozzle 7 is provided in a lower surface of an outer peripheral part of the pallet 4, and the cutting fluid is discharged in a curtain shape from the position outside the clamper 5. An annular dustproof curtain 16 is formed outside the clamper 5 to prevent chips from entering the lower side of the pallet 4. While the pallet is changed, the cutting fluid is discharged from the pipe 15 to cover a conical member 12 of the clamper 5 with a flowing water film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof device for a table of a machine tool.

[0002]

2. Description of the Related Art In a machining center, for example, a pallet on which a work is to be mounted is usually exchanged by an automatic exchanging device, and is positioned on a plurality of clampers and fixed to a table. However, according to the structure of the table portion, chips enter the lower side of the pallet during processing and pallet replacement and adhere to the clamper, which adversely affects the pallet positioning accuracy. Therefore, conventionally, a technique of covering a clamper with a cover attached to a pallet, or a technique of washing out invading chips with a cutting fluid (Japanese Utility Model Laid-Open No. 4-86147, Japanese Unexamined Patent Publication No.
0-24868) has been proposed.

[0003]

However, according to the former prior art, there is a problem that the handling of the cover is inconvenient at the time of storing the pallet, and depending on the latter prior art,
The intrusion of chips into the lower side of the pallet could not be prevented.

An object of the present invention is to provide a dustproof device for a machine tool which can form a dustproof curtain for cutting fluid outside a clamper and can surely prevent chips from entering under a pallet. .

[0005]

According to a first aspect of the present invention, there is provided a dustproof device for a machine tool in which a pallet is exchangeably mounted on a table via a clamper. And a nozzle for discharging a cutting fluid in a curtain shape from a position outside the clamper on the lower surface of the pallet.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a table portion of a horizontal machining center. The table 1 includes a base 2 and a swivel 3. A pallet 4 to which a work (not shown) is attached is mounted on the swivel 3 so as to be exchangeable via a plurality of clampers 5.

The base 2, the swivel 3 and the pallet 4 are provided with cutting fluid passages 6A, 6B and 6C which communicate with each other. A nozzle 7 having a large number of holes or continuous grooves is provided on the lower surface of the outer peripheral portion of the pallet 4 so that the cutting fluid is discharged in a curtain shape from a position outside the clamper 5. Further, a discharge port 8 for the cutting fluid for cleaning is formed on the upper surface of the central portion of the swivel 3. In FIG. 1, reference numeral 3a denotes a shaft portion of the swivel base 3.

FIG. 2 shows the internal structure of the clamper 5 in detail. A pull stud bolt 10 is screwed to the lower surface of the pallet 4 in such a manner as to project into a tapered hole 11 a of the cylindrical portion 11. The upper surface of the swivel 3 has a tapered hole 11
cone-shaped member 1 that fits into a and positions pallet 4
2 is fixed. The cone-shaped member 12 includes a collet 13 for holding the pull stud bolt 10 and a collet 1.
And a piston 14 for opening and closing the piston 3.

A pipe 15 is slidably inserted through the piston 14 and is urged by a spring 17 toward the pull stud bolt 10. The pipe 15 communicates with the cutting fluid passage 6B of the swivel base 3 through the center hole 14a of the piston 14, and communicates with the cutting fluid passage 6C of the pallet 4 through the through hole 10a of the pull stud bolt 10. Liquid passage 6
This constitutes a joint member for connecting B and 6C to be detachable.

In the dustproof apparatus configured as described above, the cutting fluid is discharged from the nozzle 7 in the form of a curtain during machining, and an annular dustproof curtain 16 is formed outside the clamper 5. 4 Prevents chips from entering the lower side. While the pallet 4 is being replaced, the cutting fluid is discharged from the pipe 15 to cover the cone-shaped member 12 of the clamper 5 with a flowing water film. Therefore, there is no possibility that chips will adhere to the clamper 5 during processing and pallet replacement.
The pallet 4 can be accurately positioned on the table 1.

The present invention is not limited to a machining center, but can be applied to various pallet-exchangeable machine tools. In addition, the shape and configuration of each part can be appropriately changed without departing from the spirit of the present invention.

[0012]

As described above in detail, according to the dustproof device of the present invention, the dustproof curtain of the cutting fluid is formed outside the clamper, so that the intrusion of the cutting chips under the pallet can be reliably prevented. It has excellent effects.

[Brief description of the drawings]

FIG. 1 is an elevational view of an entire table section showing an embodiment of a dustproof device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1 showing an internal structure of the clamper.

[Explanation of symbols]

1 ... table, 2 ... base, 3 ... turn table, 4 ...
Pallets, 5 clampers, 6A, 6B, 6C cutting fluid passages, 7 nozzles, 15 pipes, 16 dustproof curtains.

Claims (1)

[Claims] In a machine tool in which a pallet is exchangeably mounted on a table via a clamper, a cutting fluid passage communicating with the table and the pallet is formed, and a cutting fluid is formed on a lower surface of the pallet from a position outside the clamper. Dustproof device provided with a nozzle that discharges in a curtain shape.