JPH01188207A - Processing method for printed circuit board and device thereof - Google Patents

Abstract

PURPOSE:To improve the processing accuracy in the depth direction by detecting the distance between the top of a tool and the top of a pressure foot and controlling the moving amount of the tool from the relative movement start to the processing finish between a spindle head and the pressure foot based on this distance and the processing depth set in advance. CONSTITUTION:The distance l2 between the top of a drill 15 and the top of a foot 18 is obtained by the difference between the relative moving amount between a spindle head 9 and a pressure foot 18 and the reaching position of the drill 15. In a control device 34, the processing depth 13 set in advance is added to the distance l2 and the relative moving amount of the head 9 and the foot 18 necessary for processing is set as a feeding amount. In processing, when the foot 18 comes in contact on a multi-layer circuit board 1 and the relative moved amount of the head 9 and the foot 18 is equal to above feeding amount, the rotation of a servo-motor 12 is stopped or reversed. Thus, the processing with high accuracy against the processing depth l3 set in advance can be performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a printed circuit board processing method and processing apparatus, and in particular, to a method and apparatus suitable for processing blind holes and grooves with high dimensional accuracy in the depth direction. The present invention relates to a printed circuit board processing method and processing apparatus.

[Conventional technology]

As the layout of printed circuit boards and the density of mounted components become higher,
Printed circuit boards are becoming multilayered.

At the same time as this multi-layering, it has become necessary to fabricate blind holes to connect the circuits on the surface and the circuits in the inner layer, and to fabricate counterbores to attach ICs and the like.

These processes require high-precision processing with a depth of less than 95w.

For example, one of the methods for performing such processing is
There is a method disclosed in Japanese Patent Application Laid-open No. 131804/1983.

According to this method, if the inner layer circuits are exposed on the end face of a multilayer printed circuit board (hereinafter referred to as a multilayer board), holes can be accurately drilled to the required circuits.

[Problem to be solved by the invention]

However, the printed circuit board forming the inner layer of the multilayer board has a required pattern formed in advance by etching, and a crosspiece for forming a reference hole is left on the outer periphery of the printed circuit board. Therefore, controlling the machining depth by applying an electrode to the end surface of the multilayer board and establishing continuity between the drill and the electrode is as follows:
It's not funny.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a printed circuit board processing method and processing apparatus that can perform processing with high accuracy in the depth direction.

[Means for solving confusing problems]

In order to achieve the above object, in the present invention, the distance between the tip of the tool held by the spindle head and the tip of the pressure foot is detected, and based on this distance and a preset machining depth, the spindle head The amount of movement of the tool from the start of the relative movement of the pressure foot to the end of machining is controlled.

The means of the present invention will be explained based on FIG. 1, which corresponds to an embodiment.

In the figure, 1.1 is a multilayer board. A table 2 supports the multilayer substrate 1. 9 is the spindle head. A drill 15 is held by the spindle head 9. Reference numeral 16 denotes an air cylinder, which is supported by the spindle head 9 and is always supplied with air at a predetermined pressure. A pressure foot 18 is supported by a rod of the air cylinder 16.

Reference numeral 20 denotes a first detection means, which is arranged on the spindle head 9 and the pressure foot 18. A second detection means 24 is fixed on the table 2. 32 is an arithmetic circuit connected to the first detection means 20 and the second detection means 24.

34 is a control circuit, which includes the first detection means 24 and the arithmetic circuit 32.
is connected to and controls the servo motor 12.

[For production]

After the drill 15 is replaced, the drill 15 is positioned above the second detection means 24 by relative movement of the table 2 and the spindle head 9. Then, the servo motor 12 is operated to lower the spindle head 9.

Then, first, the tip of the presser foot 18 comes into contact with the second detection means 24, and the movement is stopped. On the other hand, since the spindle head 9 further descends due to the operation of the servo motor 2, relative movement between the spindle head 9 and the pressure foot 18 begins. At this time, air is discharged from the IJ-F valve interposed in the piping of the air cylinder 16 so that the pressure inside the air cylinder 16 is always maintained at the set pressure.

When the relative movement between the spindle head 9 and the pressure foot 18 begins, a pulse is detected from the first detection means 20. By counting these pulses, the amount of relative movement between the spindle head 9 and the pressure foot 18 is detected.

When the spindle head 9 descends a predetermined amount and stops in response to a command from the control device 34, the drill 15 moves to the second detection means 2.
drill 1 by the second detection means 24.
The reached position of the cutting edge No. 5 is detected.

Due to the difference in relative movement between the spindle head 9 and pressure foot 18 and the position reached by the drill 15, the drill 15
The distance t2 between the tip of the pressure foot 18 and the tip of the pressure foot 18 is determined.

Then, the machining depth t3 is preset in the control device 34.
By adding the distance t2 and the distance t2, the amount of relative movement between the spindle head 9 and the pressure foot 18 necessary for machining is set as the feed amount.

During processing, the pressure foot 18 comes into contact with the multilayer substrate 1, and the amount of relative movement between the spindle head 9 and the pressure foot 18 is compared with the feed amount, and when the two match, the rotation of the servo motor 12 is stopped. Or reverse it.

By doing so, it becomes possible to perform highly accurate machining for the preset machining depth t3.

In other words, the distance t2 between the tip of the drill 15 and the tip of the pressure foot 18 is a value that accumulates various factors that affect the dimensional accuracy in the depth direction, so which distance t2 should be used as a reference for processing? This enables high-precision machining.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show an example in which the present invention is applied to a drilling machine.

In the figure, 1 is a multilayer board. A table 2 is slidably supported by a guide member (not shown) and determines the amount of the multilayer substrate 1 to be placed thereon. 3 is a nut ζ fixed to the bottom surface of the table 2. Reference numeral 4 denotes a feed screw, which is arranged to be rotatable so as to be screwed into the nut 3, and is rotationally driven by a servo motor (not shown). A slider 5 is slidably supported by a guide member (not shown). A nut 6 is fixed to the back surface of the slider 5. Reference numeral 7 denotes a feed screw, which is arranged to be rotatable so as to be screwed into the nut 6, and is rotationally driven by a servo motor 8. A spindle head 9 is slidably supported by the slider 5. 10 is a nut fixed to the back surface of the spindle head 9. A feed screw 11 is rotatably supported by the slider 5 so as to be screwed into a nut 10, and is rotationally driven by the servo motor 2. A spindle 13 is rotatably supported by the spindle head 9 and rotationally driven by a motor (not shown). Reference numeral 14 denotes a collet chuck, which is slidably supported by the spindle 13 and driven by a driving means (not shown).

15 is a drill, which is detachably held in the collet chuck. An air cylinder 16 is supported by the spindle head 9 via a placket 17, and is constantly supplied with air at a constant pressure. A pressure foot 18 is attached to the rod of the air cylinder 6.

Reference numeral 20 denotes a first detection means, which is composed of a scale 21 fixed to the spindle head 9 and an operation frame 22 fixed to the pressure foot 18 and having one end in contact with a detector of the scale 21.

Then, the amount of relative movement between the spindle head 9 and the pressure foot 18 is detected.

24 is a second detection means, which includes a housing 25 fixed on the table 2, a lamp 26, a lens 27, a columnar lens 2B, and a charge-coupled device 29 arranged at a predetermined position inside the Nouji Puffer 25. A hole 30 into which the drill 15 is inserted is formed between the lens 27 and the columnar lens 28.

Then, the shadow of the drill 15 irradiated onto the lamp 25 is detected by the charge-coupled device 23, and the position reached by the drill 15 is detected.

32 is an arithmetic circuit connected to the first detection means 20 and the second detection means 24.

A control device 34 is connected to the first detection means 20 and controls the rotation of the servo motor 12.

With this configuration, the drill 15 is attached to the collet chuck 14.
After installing, move table 2 and slider 5,
It is located on the axis of the hole 30 of the second detection means 24.

In this state, the servo motor 12 is operated to lower the spindle head 9 to a preset position. At this time, as the spindle head 9 descends, the pressure foot 18 also descends.

When the pressure foot 18 comes into contact with the housing 25 of the second detection means 24, the pressure foot 18 is received by the housing 25 and stops moving. On the other hand, since the spindle head 9 continues to move further, the spindle head 9 and the pressure foot 18 move relative to each other.

Then, the scale 21 emits a number of pulses corresponding to the amount of relative movement between the spindle head 9 and the pressure foot 18. By counting the number of pulses, the amount of relative movement between the spindle head 9 and the pressure foot 18 is detected.

On the other hand, when the spindle head 9 reaches the lower end, the tip of the drill 15 is inserted into the housing 25 through the hole 30, as shown in FIG. At this time, the charge-coupled device 29 detects the position reached by the cutting edge of the drill 15.

The arithmetic circuit 32 subtracts the reached position t1 of the drill 15 from the thus detected relative movement tLo between the spindle head 9 and the pressure foot 18, thereby determining the position before the spindle head 9 and the pressure foot 18 start relative movement. The tip of the drill 15 and the pressure foot 18
The distance t2 of the tip of the signal is determined and applied to the control device 34.

Then, the control device 34 adds the preset machining depth ts and the distance t2, and sets the amount of relative movement between the spindle head 9 and the pressure foot 18 during machining as the feed amount.

On the other hand, after the servo motor 12 is reversed and the spindle head 9 is raised to a predetermined position, the table 2 and slider 5 are moved to position the drill 15 and the multilayer substrate 1.

Next, the servo motor 12 is activated to lower the spindle head 9 based on a command from the control device R34. Then, when the pressure foot 18 presses the multilayer board 1,
The relative movement between the spindle head 9 and the pressure foot 18 begins. At this time, the number of pulses output from the scale 20 is counted, and the spindle head 9 and pressure foot 18 are
When the relative summer movement amount reaches a preset feed amount, the servo motor 12 is reversed, the spindle head 9 is raised, and the machining of one hole is completed.

As mentioned above, the distance t2 between the tip of the drill bit 15 held on the spindle head 9 and the tip of the pressure foot 18 is
is determined, and the preset machining depth ts is determined for this distance t2.
By setting the amount added as the feed amount during processing and controlling the relative movement amount between the spindle head 9 and the pressure foot 18, variations in the length of the drill 15 used and the mounting position of the drill 15 with respect to the spindle 13, Absorbs all instability factors such as wear on the tip of the pressure foot 18, variations in the thickness of the multilayer board 1, and thermal displacement of the machine, and creates a blind hole with high precision in the depth direction from the surface of the multilayer board 1. can be processed.

Note that by detecting the distance t2 every time the drill 15 for machining a blind hole is installed or replaced, highly accurate machining can be performed without reducing work efficiency.

In the above embodiment, an optical sensor is used as the scale 21 in the first detection means 20, so that the relative movement between the spindle head 9 and the pressure foot 18 can be detected by moving the detector by 1 to several μm. Use a structured book.

3 and 4 show other embodiments of the present invention, in which the same parts as in FIG. 1 and FIG.
They are indicated by the same reference numerals.

12a is a pulse xy attached to the servo motor 12
5 w, J". 21m is a switch, when the spindle head 9 and pressure foot 18 start relative movement,
It detects it and sends a signal. A counter 31 is connected to the pulse encoder 12a and the switch 21a, and after a signal is applied from the switch 21a, the pulse encoder 12a counts the applied Salerhals. In addition, the pulse encoder 12m, the switch 21a, and the counter 3
1 constitutes a first detection means.

32 is an arithmetic circuit that calculates the distance t2 between the tip of the drill 15 held by the spindle head 9 and the tip of the pressure foot 18 based on the output of the counter 31 and the output of the second detection means 24.

33 is a setting circuit for setting the machining depth ts.

35 is an arithmetic circuit, and the distance t applied from the arithmetic circuit 32 is
2 and the machining depth ts applied from the setting circuit 33, the amount of relative movement between the spindle head 9 and the pressure foot 1B required for machining is determined and set as the feed amount.

36 is a comparison circuit that compares the feed angle set in the arithmetic circuit 35 with the relative movement amount of the spindle head 9 and pressure foot 18 counted by the counter 31, and when the two match, generates a signal indicating the end of cutting. do.

34 is a control device that reverses the rotation direction of the servo motor 12 based on a signal applied from a comparison circuit 36.

Even if such a configuration is used and the machining depth is controlled based on the output of the pulse encoder 12 & attached to the servo motor 12, highly accurate machining in the depth direction can be performed as in the previous embodiment. be able to.

In each of the above embodiments, the case where drilling is performed is described, but when performing counterbore processing, the movement of the tool in the cutting direction is stopped and the multilayer board and tool are moved in the horizontal direction. Just do it.

〔Effect of the invention〕

As described above, according to the present invention, the distance between the tip of the pressure foot and the tip of the tool is determined, and the feed rate of the spindle head is controlled based on this distance, which affects the machining accuracy in the depth direction. It is possible to perform machining while correcting all the instability factors that cause

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main parts of a printed circuit board processing apparatus according to the present invention, FIG. 2 is a block diagram showing the second detection means in FIG. 1, and FIG. FIG. 2 is a configuration diagram showing an example. DESCRIPTION OF SYMBOLS 1...Multilayer board, 2...Table, 9...Spindle spatula)', 12...Servo motor, 12a...
Pulse encoder, 15... Trill, 16... Air cylinder, 18... Pressure foot, 20... First detection means, 21... Scale, 21 &... Switch, 22... Operation Frame, 31...Counter, 24...
...Second detection means, 32...Arithmetic circuit, 33...
Setting circuit, 34... Control circuit, 35... Arithmetic circuit,
36... Comparison circuit. Representative Patent Attorney Ogawa Ogawa

Claims (1)

[Claims] 1. Find the position of the tip of the tool relative to the tip of the pressure foot before the pressure foot comes into contact with the printed circuit board, and calculate the required machining depth based on this tip position and a preset machining depth. A printed circuit board processing method characterized by setting a relative movement amount between a pressure foot and a tool, and processing the printed circuit board using this relative movement amount as a feed amount. 2. A spindle head that holds and rotates the tool and moves in the axial direction of the tool, and this spindle head,
In the printed circuit board processing apparatus, which includes a pressure foot that is movably supported in the axial direction of the tool and presses down a printed circuit board placed on a table during processing, a A first detecting means for detecting the amount of movement is provided, and a second detecting means is provided on the table for receiving a pressure foot and detecting the reached position of the tip of the tool when the spindle head is moved by a predetermined amount; From the relative movement amount detected by the first detection means and the reached position of the tool tip detected by the second detection means, the distance between the tip position of the tool held by the spindle head and the tip position of the pressure foot is calculated. It is characterized by being provided with a calculation means for determining the processing depth, and a control means for setting the feed amount necessary for machining and controlling the feed amount of the spindle head based on a preset machining depth and the distance obtained by the calculation means. Printed circuit board processing equipment. 3. A spindle head that holds and rotates the tool and moves in the axial direction of the tool, and this spindle head,
In the printed circuit board processing apparatus, which includes a pressure foot that is movably supported in the axial direction of the tool and that is placed on a table during processing and presses down the printed circuit board, these A first detecting means for detecting the amount of relative movement is provided, and a second detecting means is provided for receiving a pressure foot when the spindle head is moved to the table and detecting the reached position of the tip of the tool.
A detection means is provided, and the tip position of the tool held by the spindle head and the pressure foot are determined from the relative movement amount detected by the first detection means and the reached position of the tool tip detected by the second detection means. A calculation means for calculating the distance of the tip position of the machine, and a setting for setting the relative movement amount of the spindle head and pressure foot necessary for machining as the feed amount based on the preset machining depth and the distance calculated by the calculation means. Comparing means is provided to compare the relative movement amount detected by the first detection means during machining with the feed amount set in the setting means, and to generate a cut end signal when the two match, What is claimed is: 1. A printed circuit board processing apparatus comprising: a control means for oscillating a control signal to proceed to the next operation when receiving an end signal. 4. A spindle head that holds and rotates the tool and moves in the axial direction of the tool by the operation of a servo motor;
In the printed circuit board processing apparatus in which the spindle head is equipped with a pressure foot that presses the printed circuit board placed on the table, a first detection means for detecting the start of relative movement between the spindle head and the pressure foot; The device includes a counter that counts pulses output from a pulse encoder attached to the servo motor based on the detection signal of the detection means, and detects the amount of relative movement between the spindle head and the pressure foot based on the counted value of the counter. A first detection means is provided on the table, and a second detection means is provided on the table to receive a pressure foot and detect a position reached by the tip of the tool when the spindle head is moved, and the first detection means detects the reached position. A calculation means is provided for calculating the distance between the tip position of the tool held by the spindle head and the tip position of the pressure foot based on the relative movement amount detected by the second detection means and the reached position detected by the second detection means. A printed circuit board processing apparatus, comprising a control means for setting a feed amount necessary for processing and controlling the feed amount of a spindle head based on a set processing depth and a distance determined by the calculation means. 5. A spindle head that holds and rotates the tool and moves in the axial direction of the tool by the operation of a servo motor;
In the printed circuit board processing apparatus, the spindle head is provided with a pressure foot that is movably supported in the axial direction of the tool and presses down a printed circuit board placed on a table during processing. a first detection means for detecting the start of movement;
A counter is provided to count the pulses output from the pulse encoder attached to the servo motor based on the detection signal of the detection means, and the amount of relative movement between the spindle head and the pressure foot is detected based on the count value of the counter. a first detection means for detecting
A second detection means is provided which receives the pressure foot when the spindle head is moved and detects the reached position of the tip of the tool, and detects the relative movement amount detected by the first detection means and the second detection means. A calculation means is provided to calculate the distance between the tip position of the tool held in the spindle head and the tip position of the pressure foot from the reached position of the tool tip detected by the spindle head and pressure foot required for preset machining. A setting means is provided for setting the relative movement amount of as the feed amount, and when the relative movement amount detected by the first detection means and the feed amount set in the setting means are compared during machining, and the two match. , a comparison means for oscillating a cutting end signal is provided, and when receiving the cutting end signal,
1. A printed circuit board processing apparatus comprising a control means for oscillating a control signal in order to proceed to the next operation.