JPS6279906A - Drilling method of printed board - Google Patents

Abstract

PURPOSE:To permit to check and enhance drill machining precision by making use of the shaft center of a drill to be loaded on a work stage as the origin of coordinates for positioning in the numerical control. CONSTITUTION:A board 15 is loaded on a work stage 10. A position detection portion 5 which can previously detect a drill spindle position is arranged on the face of the work stage 10. A drill is inserted in the portion 5 which is regarded as the origin of coordinates of work stage machining to be carried out later. By the portion 5, a coordinate point is established always once on a sensor hole before punching and then machining is executed whereby high reliable punching can be accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The drilling of a large printed circuit board on which a high-density wiring pattern is formed presents a means for setting a coordinate origin to improve processing accuracy.

[Industrial application field]

The present invention relates to a printed circuit board forming method.

Recently, computer printed circuit boards have improved in their wiring storage capacity, and at the same time, the pattern width has increased.

On the one hand, pattern spacing is decreasing and on the other hand, substrates are becoming larger. Accordingly, the hole diameter of printed circuit board drilling is 1, for example, 0.35 to 5.0 mmφ.

Positioning for drilling holes also requires processing using a highly accurate numerical control device.

The present invention embodies a reliable machining method that maintains specified machining accuracy and always guarantees the accuracy.

[Conventional technology]

Figure 2 shows the conventional numerically controlled two-axis drilling system in which the processing board on the work stage of a drilling machine and the drill axis for drilling the board hole (
FIG. 3 is a front view showing the main part of spindle positioning.

In the second front view, 10 is a work stage on which a substrate is placed, 11 is a motor that moves the plane of the work stage 10 in the Y direction via a ball screw shaft 12, and 13 is a motor that moves the plane of the work stage 10 in the Y direction via a ball screw shaft 14. A motor moves the drill spindle in the X direction, and 15 is the target substrate placed on the work stage.

Reference numeral 16 denotes a saddle on which two drill spindles 18 and 19 are integrally attached, and limit switches 17 and 18 respectively, switch 17 moves the stage 10 in the Y direction, and switch 18 moves the stage 10 in the X direction. These are switches that regulate each.

[Problem that the invention seeks to solve]

By the way, during actual drilling, the origin of positioning the workpiece board is determined by a limit switch, but the position of the drill spindle is 0.08% due to the thermal influence due to rotation and the expansion and contraction of the ball screw due to the repeated movement of the stage in both the X and Y directions.
It is known that it changes by about mm.

In order to avoid such changes in the spindle position, Komei performs a break-in operation for a certain period of time, for example, about 1.5 hours, before starting steady processing.

The problem is that the processing conditions are not stable and the specified substrate drilling is not accurate.

[Means for Solving the Problems] FIG. 1 shows means for setting a coordinate origin for a work substrate according to the present invention. As shown in the figure, a position detecting section 5 is provided on the surface of the work stage 10 on which the substrate 15 is placed, so that the position of the drill spindle can be detected in advance.

A drill is inserted here to serve as the coordinate origin for subsequent work stage machining.

[For production]

Regarding the conventional drill spindle positioning using limit switches attached to the work stage and the spindle mounting saddle.

Since the drill spindle position detection unit of the present invention is a coordinate system based on the axis of the drill itself, which is directly performed on the work stage of drilling, reliable and highly integrated drilling can be performed. It will be enforced.

〔Example〕

Hereinafter, five aspects of the present invention will be explained with reference to an embodiment diagram shown in FIG. The illustration is a front view of the work stage for drilling shown in FIG. 2.

In the figure, reference pin 7 fixes the substrate to the work stage 10. And 5 is a sensor hole forming part for detecting the spindle position provided on the surface of the work stage 10.

Although not shown in the sensor hole forming section 5 on the XY stage plane 10, there may be a positional deviation of the drill spindle inserted along the Z-axis direction along the hole axis or an XY error of the spindle.
A magnetic sensor is embedded that can accurately detect the amount of deviation on a plane.

Then, the positional deviation of the drill spindle is transferred to the numerical control device, and the origin of the coordinates during machining of the drill hole is set. A position detection unit based on the drill itself is provided on the work stage 10, and Komei sets the coordinate origin once before using a standard drill or sensor rod that is saddle-mounted in the sensor hole. do,
After that, if you do the actual machining, you will be able to perform highly reliable machining.

The example diagram shows a case where two printed circuit boards 15 and 15 are simultaneously drilled on the work stage 10, and independent coordinate systems are set for detecting the positions of two standard drill axes. Needless to say, it is also applicable to a drilling machine with a four-axis configuration, for example.

Further, the sensor hole forming portion 5 shown in the embodiment diagram is not limited to a circular shape, but may be formed in a rectangular shape.

〔Effect of the invention〕

As described above, according to the method of the present invention, substrate drilling is performed using the axis of the drill itself on the actual workpiece stage as the origin of the positioning coordinates of the numerical control, thereby improving the drilling accuracy. Also, there is a remarkable effect that checking the accuracy of drilling can be carried out very easily from time to time.

[Brief explanation of drawings]

Figure 2 is an example of setting the coordinate origin for drilling according to the present invention. FIG. 2 is a front view of the main part of conventional drill positioning. In the figure, 5 is a spindle position detection hole (sensor hole). 10 is the work stage. and 15 is a printed circuit board.

Claims (1)

[Claims] A work stage (10) that fixes the substrate (15) is provided with at least a detection hole (5) for the drill spindle position, and before drilling, a rod is inserted into the detection hole (5) to drill the substrate (15). A method for drilling holes in a printed circuit board, characterized in that the drilling method is performed by setting a coordinate origin.