JPH06198509A - Nc perforating machine having bush for holding work attached/detached thereto/titerefrom - Google Patents

Abstract

PURPOSE:To provide an NC perforating machine which can have an adaptable bush to drill diameter, attached thereto/detached thereform when performating work is carried out while holding a work such as a printed board etc., by means of a bush. CONSTITUTION:A dust collecting cup 2 is arranged in such a way as covering the tool part of a spindle 1. A drill 3 provided with a collar is held by a collet chuck 1A. A counter sunk hole 2A into which the outer diameter of a magnet bush 4 can enter is formed on the bottom of the collecting cup 2, and an electromagnetic coil 6 which magnetizes the counter sunk hole 2A is attached to the collecting cup 2. Plural magnet bushes 4 with different inner diameters are stored in a bush stand 5, and the collecting cup 2 moves to the bush stand 5 and has the magnet bush 4 of its inner diameter fitted to the tool diameter of the drill 3. attached/detached thereto/therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC drilling machine for attaching and detaching a bush adapted to a drill diameter when a work such as a printed circuit board is pressed by a bush for drilling.

[0002]

2. Description of the Related Art Next, the construction of a conventional NC drilling machine will be described with reference to FIG. 4, 1 is a spindle, 2 is a dust collecting cup, 10 is a work, 11 is a table, 12 is a column, 13 is a saddle, and 14 is a headstock.

In FIG. 4, a table 1 on which a work 10 is placed is shown.
1 moves in the X-axis direction, and the saddle 13 held by the column 12 moves in the Y-axis direction. The headstock 14 held by the saddle 13 is capable of moving the machining spindle 1 in the Z-axis direction, and a tool is attached to the tip of the spindle 1. The dust collecting cup 2 is arranged so as to cover the tool portion of the spindle 1.

In FIG. 4, the spindle 1 moves in the XY directions together with the dust collecting cup 2 in response to a command from an NC device (not shown). Further, the spindle 1 attaches and detaches a tool instructed by the NC device from a tool cassette as shown in the automatic tool changing device of Japanese Patent Publication No. 2-29456. The dust collecting cup 2 is for connecting with a dust collecting device to suck out the processing dust, and the bottom portion of the dust collecting cup 2 contacts the work 10.

[0005]

Next, the tool portion of FIG. 4 will be described with reference to FIG. Generally, when drilling, good quality drilling can be performed by holding the work with a bush with holes to prevent vibration and lifting of the work. However, in the drilling machine using the drill 3 with the collar 3A shown in FIG.
Since the collar 3A passes through B, the work 10 is pressed by the hole 2B having a larger diameter than the drill diameter for processing. In the NC drilling machine, since a plurality of drills are attached to and detached from the collet chuck 1A for processing, there is a problem that it is difficult to machine a good quality hole with a small diameter drill.

[0006] It is an object of the present invention to provide an NC drilling machine for magnetically attaching and detaching a bush having an inner diameter matching the tool diameter of a drill to a dust collecting cup and pressing a work with the bush to machine a high quality hole.

[0007]

To achieve this object, in the first invention, a plurality of magnet bushes 4 having the same outer diameter but different inner diameters are accommodated in a bush stand 5 made of a non-magnetic material. 4 is formed in the bottom portion of the dust collecting cup 2 and the electromagnetic coil 6 for magnetizing the spot facing hole 2A is attached to the dust collecting cup 2 to form the dust collecting cup 2
Moves to the bush stand 5 and attaches and detaches the magnet bush 4 having an inner diameter that matches the tool diameter of the drill 3.

In the second invention, a plurality of magnetic bushes 7 having the same outer diameter but different inner diameters are provided.

[0009]

Next, the structure of the NC drilling machine according to the first invention will be described with reference to FIGS. 1 and 2. 4 in FIG. 1 is a magnet bush,
Reference numeral 6 is an electromagnetic coil, and the others are the same as those in FIG. In FIG. 1, a counterbore 2A into which the outer diameter of the magnet bush 4 is inserted is formed at the bottom of the dust collecting cup. An electromagnetic coil 6 that magnetizes the counterbore 2A is attached to the dust collecting cup 2.

FIG. 2 is a perspective view of FIG. 1, in which the bush stand 5 is arranged outside the table 11 of FIG. 4, and the bush stand 5 has a plurality of magnets having the same outer diameter and different inner diameters. The bush 4 is accommodated. The bush stand 5 is a non-magnetic material, and the magnet bush 4 is not attracted.

Next, the operation of FIGS. 1 and 2 will be described with reference to the flow chart of FIG. In step 101 of FIG. 3, the drill 3 is attached to the collet chuck 1A without attaching the magnet bush 4 to the dust collecting cup 2. Step 1
In 02, the spindle 1 and the dust collecting cup 2 move to the bush stand 5 and are located on the magnet bush 4 which fits the drill 3. In step 103, the dust collecting cup 2 descends to attract the magnet bush by magnetic force.

At step 104, the spindle 1 and the dust collecting cup 2 are moved to the processing position of the work 10. In step 105, the dust collecting cup 2 descends and the magnet bush 4 holds the work 10. In step 106, the drill 3 descends to drill the work 10. In step 107, if the drilling process is to be ended, a series of processing operations is ended. If the drilling is not completed in step 107, the process proceeds to step 108.

At step 108, the spindle 1 and the dust collecting cup 2 are moved to the bush mount 5. Step 10
At 9, the magnet bush 4 moves to the original storage position of the bush mount 5. In step 110, the dust collecting cup 2 is lowered, and the electromagnetic coil 6 excites the dust collecting cup 2 in a polarity opposite to that of the magnet bush 4. In step 111, the magnet bush 4 is separated from the dust collecting cup 2 and is housed in the bush stand 5. A series of operations ends. Step 1
After step 11, the drilling process is performed with a drill diameter different from that in step 101, and therefore the process returns to step 101.

Next, the second invention will be described. Second
In the invention, the magnetic bush 7 is used instead of the magnet bush 4 used in the first invention. Therefore, the second
In step 103 of FIG. 3, the electromagnetic coil 6 excites the dust collecting cup 2 to adsorb the magnetic bush 7,
In step 110, the dust collecting cup 2 is demagnetized by the electromagnetic coil 6 and the magnetic bush 7 is housed in the bush mount 5.

[0015]

According to the present invention, a bush having an inner diameter that matches the tool diameter of a drill is magnetically attached to and detached from the dust collecting cup, and the work is held by the bush, so that a good quality hole can be machined.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an NC drilling machine according to a first invention.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a flowchart illustrating the operation of FIGS. 1 and 2.

FIG. 4 is a configuration diagram of an NC drilling machine according to a conventional technique.

5 is an enlarged view of a main part of a tool portion of FIG. 4. FIG.

[Explanation of symbols]

 1 Spindle 2 Dust collecting cup 2A Counterbore hole 3 Drill 4 Magnet bush 5 Bush stand 6 Electromagnetic coil 7 Magnetic bush

Claims (2)

[Claims] 1. An NC for processing a workpiece (10) by arranging a dust collecting cup (2) so as to cover a tool portion of a spindle (1) and holding a collared drill (3) on a collet chuck (1A).
In a hole puncher, multiple magnet bushes with the same outer diameter but different inner diameters (4)
Is housed in a non-magnetic bush stand (5), and a counterbore (2A) is formed in the bottom of the dust collecting cup (2) to accommodate the outer diameter of the magnet bush (4). Dust cup with magnetizing magnet coil (6)
Attach it to (2) and move the dust collection cup (2) to the bush stand (5) and drill.
NC for attaching / detaching a work clamp bush characterized by attaching / detaching a magnet bush (4) having an inner diameter matching the tool diameter of (3)
Hole puncher. 2. The NC hole punching machine for attaching and detaching a work holding bush according to claim 1, further comprising a plurality of magnetic bushes (7) having the same outer diameter and different inner diameters.