JP3035660B2 - Printed circuit board drilling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a printed circuit board punch.

[0002]

2. Description of the Related Art Conventionally, a printed board drilling machine used for mounting electronic components is provided on an upper surface of a lower support base and horizontally moves in the X-axis direction by a driving force of an X-axis servomotor. Table plate (sliding plate) for cutting material set,
A horizontal moving plate provided on the front surface of the upper support base and horizontally moving in the Y-axis direction by the driving force of the Y-axis servo motor; and a Z-moving plate provided on the front surface of the horizontal moving plate and driven by the Z-axis servo motor. A vertical moving member that moves vertically in the axial direction, a main shaft provided on the vertical moving member, and an exchange that drills a work set by a driving force of a motor that is rotatably supported by the main shaft and built in the main shaft. It is composed of a plurality of possible drills and a control device which is electrically connected to the servomotor of each axis and controls the rotation of each servomotor.

[0003] In the printed circuit board drilling machine having such a configuration, when drilling a work set, first, the X-axis and / or the Y-axis servomotor is driven, and the X-axis and / or the Position the Y axis. On the other hand, the Z-axis servomotor is driven at a “certain time” which overlaps the X-axis and / or the Y-axis before the positioning completion time of the X-axis and / or the Y-axis, and the drill is lowered. I have.

The reason why the Z-axis servomotor is driven before the completion of the positioning of the X-axis and / or the Y-axis is that when a printed circuit board is formed with a large number of holes, the number of holes is very large.
This is because even a slight change in the time for drilling one hole greatly affects the overall drilling time. .

Therefore, as shown in FIG. 5, the X-axis, Y-axis and Z
The axes are moving overlapping. Of course, at the time when the tip of the drill reaches the surface of the work material set (printed circuit board), it is necessary to complete the positioning of both the X axis and the Y axis.

Therefore, the Z-axis descent start time is generally X
X-axis, Y-axis remaining movement distance mm with respect to axis, Y-axis command coordinates
It is often determined experimentally as time t1 when a certain threshold value L is reached.

However, in the conventional printed circuit board drilling machine, the drill feed distance (meaning the gap between the tip of the drill and the surface of the work material set) A is constant, and Z is constant.
The feed speed B of the shaft descent is determined by the cutting conditions of the drill and the work material set, and the Z-axis descent timing has a different diameter despite the fact that the feed speed B is fast b1 or slow b2. It was constant regardless of the feed speeds b1 and b2 of each drill.

[0008] Therefore, for example, the one b1 having a high feed speed is the positioning completion time t2 of the X-axis and / or the Y-axis.
A waiting time t4 occurs between the time t3 and the time t3 when the Z-axis drill starts cutting the surface of the printed circuit board.

[0009] Therefore, the conventional printed circuit board drilling machine is designed so that the cutting edge of the drill in the Z axis just before the positioning of the X axis and / or the Y axis feeds each drill having a different diameter to the surface of the work material set. The disadvantage was that it could not be reached regardless of speed.

In FIG. 5, reference numeral C denotes a moving distance of a table plate (sliding plate) on the X axis or a moving plate (sliding plate) on the Y axis. Symbol D represents the overlapping time width of each of the axes X, Y, and Z from the time t1 when the descent of the Z-axis is started to the time t2 when the positioning of the X-axis and / or the Y-axis is completed.

[0011]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, the present invention has been made in consideration of the above-mentioned drawbacks, regardless of the feed speed of each drill having a different diameter, before the Z-axis and / or the Y-axis are positioned just before positioning. The drill edge of the drill can reach the surface of the work material set, thus shortening the processing time, increasing the precision of the hole position, and preventing the drill from being damaged. Is to get a chance.

[0012]

A printed board drilling machine according to the present invention is a horizontal slide plate provided on the upper surface of a lower support 1 and horizontally moved in the X-axis direction by the driving force of an X-axis servomotor 5. 3 and Y provided on the upper surface of the horizontal sliding plate.
The work material setting table plate 7 that moves horizontally in the Y-axis direction by the driving force of the axis servomotor 9, and is provided on the front surface 2 a of the upper support base 2 and is driven in the Z-axis direction by the driving force of the Z-axis servomotor 13. The workpiece set 17 is pierced by a driving force of a vertical moving member 11 that moves vertically, a main shaft 15 provided on the vertical moving member, and a motor rotatably supported by the main shaft and built in the main shaft. A plurality of exchangeable drills 16; and a control unit 23 electrically connected to the servomotors of the respective axes and controlling the rotation of the servomotors. The central processing unit 2 of the control unit
Reference numeral 4 denotes a first storage circuit 26 in which the Z-axis descending feed rates of the drills having different diameters are respectively stored, and designation of the X-axis and Y-axis for detecting the Z-axis descending start time corresponding to the Z-axis descending feed rate. A threshold of each drill electrically connected to the second storage circuit 27 storing the threshold value L of the remaining movement amount of the X axis and the Y axis with respect to the coordinate, respectively, and electrically connected to the central processing unit. The value L determination circuit 28 determines the threshold value L of the drill based on the storage signals of the first and second storage circuits.

[0013]

First, the central processing unit of the controller reads the Z-axis descent feed speed of the drill selected from the first storage circuit.

Next, the central processing unit stores the remaining movement of the X-axis and Y-axis relative to the designated coordinates of the X-axis and Y-axis for detecting the Z-axis descent start time corresponding to the Z-axis descent feed speed from the second storage circuit. The "threshold L" of the quantity is read through the threshold L determination circuit.

The threshold L determining circuit determines the threshold L of the drill by associating the information stored in the first storage circuit with the information stored in the second storage circuit. Then, the central processing unit temporarily stores the threshold value L of the drill in the third storage circuit based on the determination of the threshold value L determining circuit, and rotates the spindle at high speed.

Next, the central processing unit activates the X-axis and / or Y-axis servomotors based on a command of the machining program.

Thus, the central processing unit is provided with an X-axis or /
Then, the Z-axis servomotor is started based on the threshold value L stored in the third storage circuit before the positioning completion time of the Y-axis. Then, the drill descends toward the surface of the work set, and at the same time when the X-axis and / or Y-axis positioning is completed, the drill reaches the surface of the work set and immediately starts cutting.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings.

In one embodiment shown in FIGS.
Reference numeral 50 denotes a printed circuit board drilling machine used for making a hole in a printed circuit board.

That is, 1 is a lower support, 2 is an upper support mounted on the rear upper surface of the lower support 1, and 3 is a pair of first supports provided in parallel with the upper surface of the lower support 1. It is a horizontal sliding plate guided by the guide rails 4.

This horizontal sliding plate 3 is a servomotor 5 for X-axis.
With the driving force of, the actuator horizontally moves in the X-axis direction via the first screw rod 6.

Reference numeral 7 denotes a work material setting table plate guided by a pair of second guide rails 8 provided in parallel with the upper surface of the horizontal slide plate 3. The table plate 7 is horizontally moved in the Y-axis direction intersecting the X-axis via the second screw 10 by the driving force of the Y-axis servo motor 9 fixedly provided at one end of the horizontal sliding plate. The second screw rod 10 is appropriately supported on the horizontal slide plate 3 so as to be located between the second guide rails 8. Therefore, the first guide rails 4, 4 and the second guide rails 8, 8 and the first screw rod 6 and the second screw rod 10 are arranged so as to cross each other.

Reference numeral 11 denotes a vertical moving member (spindle saddle) guided by a pair of third guide rails 12, 12 provided on the front surface 2a of the upper support 2. Usually, two or more vertical movement members 11 are provided.
By the driving force of No. 3, it vertically moves in the Z-axis direction via the third screw rod 14.

Reference numeral 15 denotes a main shaft provided on the vertical moving member 11. The main shaft 15 has a built-in motor, and the drill 16 rotates at high speed by the driving force of the motor.

As shown in FIG. 2, reference numeral 17 denotes a work material set mainly composed of a printed circuit board.
Are laid on each other, and a bakelite floor plate 17b is used thereunder, and an aluminum backing plate 17c is used thereover. The work material set 17 is fixed to the table plate 7 via reference pins 18 provided on the upper surface of the table plate 7.

Reference numeral 19 denotes a pressure foot, which is mounted on the vertical moving member 11 via a pair of air cylinders 20. Replacement drill groups 21 having different diameters from each other are arranged on the table plate 7 via a tool post group 22.

A control device 23 controls the rotation of the Z-axis servomotor 5, the Y-axis servomotor 9, the Z-axis servomotor 13 and the motor of the main shaft 15, respectively.

FIG. 3 shows a main part of the control device 23.
Therefore, the control device 23 will be described in more detail. Reference numeral 24 denotes a central processing unit CPU, which includes an X-axis servo motor 5, a Y-axis servo motor 9, and a Z-axis servo motor 13, respectively. Connected.

Reference numeral 25 denotes a storage medium such as a floppy disk containing the work program of the work material set 17.

Reference numeral 26 denotes a first storage circuit which is electrically connected to the central processing unit 24 and stores the Z-axis downward feed speed of each drill having a different diameter. The first storage circuit 26 stores a Z-axis descending feed speed mm corresponding to the type of drill (drill 1, drill 2, drill 3,..., Drill n).
/ Min (1000, 2500, 3000... N).

Numeral 27 is electrically connected to the central processing unit 24, and the X-axis and Y-axis corresponding to the designated X-axis and Y-axis coordinates for detecting the Z-axis descent start time corresponding to the Z-axis descent feed speed.
This is a second storage circuit that stores the “threshold L” of the remaining movement amount of the axis. In this embodiment, when the Z-axis descending feed speed mm / min is 0 to 1,000, the threshold value Lmm is 0.05, and the Z-axis descending feed speed mm / min.
When the minute is 1,001 to 2,000, the threshold value Lmm is 0.
04, Z-axis descending feed speed mm / min is 2,001 to 3,0
At the time of 00, the threshold Lmm is set to 0.03... N, and the “threshold L” is set corresponding to each group of the Z-axis descending feed speed.

Reference numeral 28 denotes a threshold L determining circuit for determining the "threshold L" of the drill based on the stored signals of the first and second storage circuits. This threshold L determination circuit 2
8, as shown in FIG. 4, immediately after the positioning completion time of the X-axis and / or the Y-axis (time t2) and the start of the Z-axis descent (time t1), immediately before the surface 30 of the work material set. Overlap time (the same as at time t2) (D1
Alternatively, the threshold value L of the drill is determined as D2).

Reference numeral 29 denotes a third memory which is electrically connected to the central processing unit 24 and temporarily stores the "threshold L" determined for the drill 16 by the threshold L determining circuit 28. Circuit.

In the above configuration, a basic operation mode of the printed board drilling machine 50 will be described.

First, when the control device 23 starts operating, it reads a machining program from the storage medium 25. Drilling machine 5
0 indicates that when the drill exchange is necessary after the completion of the reading of the machining program, the drill of the program command is selected from the exchange drill group 21 in the tool post 22 and the spindle 1 thereof is selected.
Set to 5.

Next, the central processing unit 24 of the control unit 23
Is the drill 16 selected from the first storage circuit 26
Of the Z-axis descending feed speed is read. For example, the drill 16
Is "drill 2", it is read that the Z-axis descending feed speed is "2,500 mm / min".

Next, the central processing unit 24 stores the X-axis and Y-axis corresponding to the specified coordinates of the X-axis and the Y-axis for detecting the Z-axis descent start time corresponding to the Z-axis descent feed speed from the second storage circuit 27.
The “threshold L” of the remaining movement amount of the axis is read via the threshold L determination circuit 28. The threshold value L determination circuit 28 associates the storage information of the first storage circuit 26 with the storage information of the second storage circuit 27. For example, if the Z-axis descent feed speed is “2,500 mm / min” If the threshold L is 0.
It is determined to be 03 mm. When the central processing unit 24 reads the threshold value L of the drill 16 based on the determination of the threshold value L determining circuit 28, the central processing unit 24 temporarily stores the “threshold value L (for example, 0 .03mm) "
And the main shaft 15 is rotated at high speed.

Next, the central processing unit 24 activates the X-axis and / or Y-axis servomotors 5, 9 based on a command of the machining program. Then, for example, the horizontal sliding plate 3
The horizontal movement of the table and the table plate 7 allows the X axis,
The planar positioning of the Y axis is performed.

The central processing unit 24 sets the Z-axis servo motor 13 based on the "threshold value L (for example, 0.03 mm)" before the completion of the planar positioning of the X-axis and / or the Y-axis. Start. Then, drill 1
Numeral 6 descends toward the surface 30 of the work material set 17 (the surface of the backing plate), the X-axis or Y-axis positioning completion time and the drill 16 reach the work material set surface 30 and start cutting. Drilling processing is started substantially at the same time when the positioning is completed.

Here, based on FIG.
The case of the fast b1 (virtual line) and the slow b2 (solid line) will be described.

FIG. 4 is the same as the conventional explanatory diagram (FIG. 5), and therefore, reference numerals will be briefly described here for convenience.

That is, the horizontal axis represents time t. The vertical axis represents the movement amount mm of the X axis or the Y axis indicated by a solid line above. t1 is the third
At the time when the "threshold value L (for example, L1, L2)" of the drill is temporarily stored in the storage circuit 29 of FIG. This time t
1 corresponds to the diameter of the drill selected from the replacement drill group 21 and has a high Z-axis descending feed speed B shown below, b1
(Virtual line) and variable speed b2 (solid line) are variable. Therefore, for example, the X-axis corresponding to the thresholds L2 and L1,
D1 when the overlapping time width of Y axis and Z axis is long
There is D2 when it is short. A is the fantasy distance of the drill. C is the actual amount of movement on the X or Y axis. 30 is the surface of the work material set.

Therefore, according to the present invention, as is apparent from FIG. 4, the selected drill is either a high b1 (virtual line) or a low b2 (solid line) Z-axis lowering feed speed B. , The X-axis or Y-axis positioning completion time t2 substantially coincides with the time t2 at which the drill 16 reaches the surface 30 of the workpiece set and starts cutting.

When the vertical moving member 11 moves down to the Z axis in this manner, the pressure foot 19 presses the work material set 17 with an appropriate pressure, and the drill 1 rotating at a high speed is rotated.
6 makes a hole in the work material set 17.

[0045]

As is apparent from the above description, in the present invention, regardless of the feed speed of each drill having a different diameter, the Z-axis is positioned just before the X-axis and / or the Y-axis is positioned. The cutting edge of the drill can reach the surface of the workpiece set.

Therefore, it is possible to shorten the processing time, increase the accuracy of the hole position, prevent the drill from being damaged, and the like.

In the case of the embodiment in which the vertical moving member is provided with a pressure foot capable of pressing the work material set via an air cylinder, the work material set can be pressed with an appropriate pressure. .

[0048]

[Brief description of the drawings]

[0049]

FIG. 1 is a perspective view showing the entire apparatus of the present invention.

[0050]

FIG. 2 is a schematic explanatory view showing a main part of the apparatus of the present invention.

[0051]

FIG. 3 is a block diagram of an electric circuit of a main part of the present invention.

[0052]

FIG. 4 is an explanatory diagram relating to a threshold value L of the present invention.

[0053]

FIG. 5 is an explanatory diagram relating to a conventional threshold value L.

[0054]

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lower support stand, 2 ... Upper support stand, 3 ... Horizontal sliding plate, 4
... first guide rail, 5 ... X-axis servo motor, 6 ... first screw rod, 7 ... table plate, 8 ... second guide rail, 9 ...
Y-axis servo motor, 10: second screw rod, 11: vertical moving member, 12: third guide rail, 13: Z-axis servo motor, 14: third screw rod, 15: spindle, 16: drill, 1
7: Workpiece set, 19: Pressure foot, 20: Air cylinder, 21: Replacement drill group, 22: Tool post group, 23: Control device, 24: Central processing unit, 26
.. A first storage circuit, 27 a second storage circuit, 28 a threshold L determination circuit, 29 a third storage circuit, and 30 a surface.

Continuation of the front page (51) Int.Cl. ⁷ identification code FI H05K 3/00 H05K 3/00 M (58) Field surveyed (Int.Cl. ⁷ , DB name) B26F 1/16 B23B 41 / 00,47 / 18 B26D 5/06 H05K 3/00

Claims (3)

(57) [Claims] 1. A horizontal sliding plate 3 provided on the upper surface of a lower support base 1 and horizontally moved in the X-axis direction by the driving force of an X-axis servo motor 5, and provided on an upper surface of the horizontal sliding plate. A work material setting table plate 7 which moves horizontally in the Y-axis direction by the driving force of a Y-axis servo motor 9;
Moving member 11 which is provided on the front surface 2a of the motor and moves vertically in the Z-axis direction by the driving force of the Z-axis servo motor 13.
A spindle 15 provided on the vertical moving member; and a plurality of replaceable drills 16 rotatably supported by the spindle and drilling a work material set 17 by a driving force of a motor built in the spindle. And a control device 23 electrically connected to the servomotors of the respective axes to control the rotation of the servomotors. The central processing unit 24 of the control device includes a Z-axis of each drill having a different diameter. A first storage circuit 26 in which the descending feed speeds are stored, and the remaining movement amounts of the X-axis and the Y-axis with respect to the designated coordinates of the X-axis and the Y-axis for detecting the Z-axis descending start time corresponding to the Z-axis descending feed speed The threshold L determination circuit 28 of each drill electrically connected to the second storage circuit 27 storing the threshold L of each of the drills and electrically connected to the central processing unit, respectively. Description of the second storage circuit Based on the signal, the printed circuit board drilling machine, characterized by determining the threshold value L of the drill. 2. The control device according to claim 1, wherein the central processing unit of the control device is connected to a third storage circuit 29 for temporarily storing the threshold value of the drill determined by the threshold value L determination circuit. Printed circuit board drilling machine. 3. The printed circuit board hole according to claim 1, wherein the vertical moving member is provided with a pressure foot 19 capable of pressing the work material set 17 via an air cylinder 20. Dawning machine.