JP2020179445A - Drilling device and drilling method - Google Patents

Abstract

To avoid a situation in which suction of chips becomes insufficient during machining with a drill of a certain diameter, even when an amount of discharged chips varies, and further, to avoid a drop in machining efficiency.SOLUTION: A drilling device comprises: a dust collector which is connected to a space surrounded by a spindle to which a drill is attached and a pressure foot for pressing a workpiece, and suctions chips generated during drilling with the drill; a chip amount detector which detects an amount of the chips suctioned by the dust collector; and a controller which performs control so that a clearance between a tip of the pressure foot and the workpiece is changed when the drill is moved to a next machining position, on the basis of the amount of chips detected by the chip amount detector, in conducting a machining operation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drilling apparatus and a drilling method used when, for example, drilling a printed circuit board with a drill.

In a conventional drilling apparatus, for example, as disclosed in FIG. 1 of Patent Document 1, a space surrounded by a spindle on which a drill is mounted and a pressure foot for pressing a printed circuit board to be a work is connected to a dust collector. However, the outside air is taken in from the hole for passing the drill provided in the pressure foot, and the chips generated by the processing are discharged from the printed circuit board.
In the technique of Patent Document 1, when the diameter of the drill is small, the so-called air cut is reduced by reducing the gap between the tip of the pressure foot and the printed circuit board when moving the drill to the next machining position. We are trying to improve processing efficiency.
In this conventional technique, the gap is determined depending on the diameter of the drill. Therefore, when the amount of chips discharged is unexpectedly changed during processing with a drill having a certain diameter, the above-mentioned There is a possibility that the gap becomes too large to reduce the processing efficiency, or the gap becomes too small and the suction of chips becomes insufficient.

Japanese Patent No. 4295018

Therefore, an object of the present invention is to solve the problems of the prior art so that the suction of chips does not become insufficient even when the amount of chips discharged fluctuates during processing of a certain diameter. Moreover, the purpose is not to reduce the processing efficiency.

In order to solve the above problems, among the inventions disclosed in the present application, a typical drilling apparatus is connected to a space surrounded by a spindle on which a drill is mounted and a pressure foot for pressing a work, and drills by the drill. A dust collector that sucks the chips generated in the above, a chip amount detection unit that detects the amount of the chips sucked by the dust collector, and the tip of the pressure foot when the drill is moved to the next processing position. It is characterized by having a control unit that controls the machining operation by changing the gap with the work based on the amount of chips detected by the chip amount detection unit.

Further, in a typical drilling method disclosed in the present application, a dust collector connected to a space surrounded by a spindle on which a drill is mounted and a pressure foot for pressing a work is used to suck chips generated by drilling with the drill. In the drilling method described above, the amount of the chips sucked into the dust collector is detected, and the tip of the pressure foot and the work when the drill is moved to the next machining position based on the detection result. It is characterized in that the machining operation is performed by changing the gap.

The typical features of the invention disclosed in the present application are as described above, but the features not described here are described in the form for carrying out the invention described later, and claims for patent. As shown in the range.

According to the present invention, even when the amount of chips discharged fluctuates during processing, the suction of chips does not become insufficient, and the processing efficiency can be prevented from being lowered. ..

It is a figure which shows the structure of the drilling apparatus which becomes one Example of this invention.

Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration of a drilling apparatus according to an embodiment of the present invention.
In FIG. 1, 1 is a printed circuit board to be drilled, 2 is a table on which the printed circuit board 1 is placed, 3 is a drill for drilling a hole in the printed circuit board 1, and 4 is a spindle 5 having a built-in motor for rotating the drill 3. It is a spindle unit that holds.
The table 2 is driven by the table drive unit 6 so that the drill 3 faces a position where a hole is to be drilled in the printed circuit board 1. The spindle unit 4 is driven in the vertical direction from the spindle vertical drive unit 7.

A pressure foot 9 for pressing the printed circuit board 1 during drilling is engaged on the lower side of the spindle 5. The pressure foot 9 is connected to the spindle unit 4 via a cylinder 8. When the spindle unit 4 is lowered, it is lowered together with the spindle unit 4 until it comes into contact with the upper surface position of the printed circuit board 1.
The spindle unit 4 and the pressure foot 9 are engaged with each other at a predetermined interval in the height direction, and when the spindle unit 4 is lowered, they are lowered together halfway, and the pressure foot 9 is positioned on the upper surface of the printed circuit board 1. After that, the pressure foot 9 stays at that position, and only the spindle unit 4 independently descends so that the drill 3 can make a hole. When the drilling is completed and the spindle unit 4 is raised, the pressure foot 9 is also raised from a certain position.

Reference numeral 10 denotes a substrate top surface sensor composed of a detector 11 fixed to the spindle unit 4 and a rod 12 fixed to the pressure foot 9. When the pressure foot 9 rises and the detector 11 optically detects the tip of the rod 12, an ON signal is output, and when the pressure foot 9 descends and the detector 11 does not detect the tip of the rod 12, an OFF signal is output. It has become.
Therefore, when the spindle unit 4 is lowered, the pressure foot 9 reaches the upper surface position of the printed circuit board 1, only the pressure foot 9 cannot be lowered any further, and the spindle unit 4 and the pressure foot 9 are vertically displaced from each other. When it is detected, the substrate top surface sensor 10 outputs an ON signal. Further, when the spindle unit 4 is raised thereafter, the substrate top surface sensor 10 outputs an OFF signal when the pressure foot 9 moves away from the top surface position of the printed circuit board 1.
The chips generated by the drilling are guided from the drill hole 13 provided in the pressure foot 9 to the space 14 surrounded by the spindle 5 and the pressure foot 9, and are guided to the dust collector 16 through the pipe 15. A chip counter 17 for detecting the amount of chips is provided in the middle of the pipe 15.

Reference numeral 18 denotes an overall control unit that controls the operations of the table drive unit 6, the spindle vertical drive unit 7, and the dust collector 16. The overall control unit 18 also performs other controls, but since it is not directly related to this embodiment, description thereof will be omitted here.
The overall control unit 18 controls the table drive unit 6 while recognizing the two-dimensional position information of the table 2 based on the feed position information inside the table drive unit 6.
Further, the overall control unit 18 controls the spindle vertical drive unit 7 while recognizing the height information of the current tip position of the pressure foot 9 at the tip of the drill 3 based on the feed position information inside the spindle vertical drive unit 7. Therefore, it is possible to control the gap between the tip of the pressure foot 9 and the printed circuit board 1 (hereinafter, this is referred to as a pressure foot gap) after making one hole.

The detection signal from the substrate top surface sensor 10 is input to the overall control unit 18, and the overall control unit 18 is the position where the pressure foot 9 comes into contact with the top surface position of the printed circuit board 1 from the feed position information inside the spindle vertical drive unit 7. It is possible to recognize the height information of.
The detection signal from the chip counter 17 is input to the overall control unit 18, and based on this, the overall control unit 18 changes the dust collection pressure of the dust collector 16.
The overall control unit 18 is realized by, for example, a program control processing device, has a control function other than that described here, and is also connected to a block (not shown).

In the above drilling apparatus, when the amount of chips detected from the chip counter 17 becomes small, the overall control unit 18 lowers the dust collection pressure of the dust collector 16. As a result, the suction force to the printed circuit board 1 is weakened, so that the overall control unit 18 operates so as to set the pressure foot gap small and perform the subsequent drilling process.
On the other hand, when the amount of chips detected from the chip counter 16 increases, the overall control unit 18 raises the dust collection pressure of the dust collector 16. As a result, the suction force to the printed circuit board 1 becomes stronger, so that the overall control unit 18 operates so as to set a large pressure foot gap to suppress the floating of the printed circuit board 1 and then perform the drilling process.

According to the above embodiment, since the pressure foot gap is changed according to the amount of chips discharged, the amount of chips discharged during processing with a drill having a certain diameter fluctuates unexpectedly. Even when this is done, the pressure foot gap corresponding to the drill can be provided, there is no risk of insufficient suction of chips, and the processing efficiency can be maintained.

1: Printed circuit board, 2: Table, 3: Drill, 4: Spindle unit,
5: Spindle, 6: Table drive, 7: Spindle vertical drive,
9: Pressure foot, 10: Board top sensor, 15: Pipe, 16: Dust collector,
17: Chip counter, 18: Overall control unit

Claims (4)

A dust collector that is connected to the space surrounded by the spindle on which the drill is mounted and the pressure foot for pressing the work and sucks the chips generated by drilling with the drill, and the amount of the chips sucked by the dust collector is detected. The gap between the chip amount detection unit and the tip of the pressure foot and the work when the drill is moved to the next machining position is changed based on the amount of chips detected by the chip amount detection unit. A drilling apparatus characterized by having a control unit for controlling the drilling operation. In the drilling apparatus according to claim 1, the control unit makes the gap smaller when the amount of chips detected by the chip amount detecting unit is small than when the amount of chips is large. apparatus. In a drilling method in which a dust collector connected to a space surrounded by a spindle on which a drill is mounted and a pressure foot for pressing a work is used to suck chips generated by drilling with the drill, the dust collector sucks the chips. The amount of the chips is detected, and based on the detection result, the gap between the tip of the pressure foot and the work when the drill is moved to the next machining position is changed so that the machining operation is performed. A characteristic drilling method. The drilling method according to claim 3, wherein the gap is made smaller when the amount of the chips sucked into the dust collector is small than when the amount is large.

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