JP4081418B2 - Printed circuit board processing machine - Google Patents

Description

  The present invention relates to a printed circuit board processing machine that processes a workpiece by pressing the periphery of a workpiece processing portion with a pressure foot that is a workpiece pressing means.

  Conventionally, as a printed circuit board processing machine, there is a printed circuit board drilling machine (see, for example, Patent Document 1). There is also a printed board drilling machine shown in FIG.

  FIG. 3 is a perspective view of a printed circuit board drilling machine, which is a conventional printed circuit board processing machine. FIG. 4 is a partial front sectional view of the tip of the spindle in the printed circuit board drilling machine of FIG.

  As shown in FIG. 3, the table 1 in the printed circuit board drilling machine 100 is movably provided on a track 4 fixed on the bed 3, and reciprocates in the direction of arrow X by the X-axis motor 2. ing. The column 5 is fixed to the bed 3 across the table 1. The cross slide 6 is movably provided on a track 9 fixed to the side surface of the column 5 and is reciprocated in the direction of arrow Y by a Y-axis motor 7 and a ball screw 8. The housing 10 is movably provided on a track 13 fixed on the cross slide 6, and is moved up and down in the arrow Z-axis direction by a Z-axis motor 11 and a ball screw 12. The directions of the arrows X, Y, and Z are directions orthogonal to each other.

  A plurality of printed circuit boards 30 are stacked and fixed to the table 1. An upper plate 31 is overlaid on the uppermost printed circuit board 30. The upper plate 31 is an aluminum plate having a thickness of about 0.5 mm.

  In FIG. 4, a spindle 21 that rotatably holds a drill 20 that is a processing tool is supported by a housing 10. A bush 23 serving as a work pressing portion is provided at the tip of the pressure foot main body 22 into which the tip of the spindle 21 enters. The tip part (lower end part) of the bush 23 is formed in an annular shape. A groove 24 that connects the outer peripheral portion and the through hole 26 is formed at the lower end of the bush 23. Hereinafter, the pressure foot main body 22 and the bush 23 are collectively referred to as a pressure foot PF which is a work pressing means.

  The pressure foot PF is provided on the piston rod 41 a of the air cylinder 41 via the connection joint 40. The air cylinder 41 is held by the housing 10. The air cylinder 41 is attached to the housing 10 so that the distance between the lower end of the bush 23 and the tip of the drill 20 when the piston rod 41a is extended becomes a predetermined value g. The outer diameter of the lower end of the bush 23 is D, and the diameter of the through hole 26 is d. A space 25 formed by the spindle 21 and the pressure foot PF is connected to a dust collector 27. The NC device 28 controls the motors of the respective axes.

  The printed circuit board drilling machine 100 moves the cross slider 6 in the arrow Y direction and moves the table 1 in the arrow X direction to position the drill 20 at the processing location. Thereafter, the housing 10 descends integrally with the spindle 21 and the pressure foot PF. The pressure foot PF contacts the upper plate 31 and is prevented from descending, and the air cylinder 41 is contracted, and the printed circuit board 30 is pressed against the table 1 through the upper plate 31 by the reaction force. The spindle 21 continues to be lowered together with the housing 10, and a hole is formed at a predetermined position of the printed circuit board 30 by the rotation of the drill 20 and the lowering of the spindle 21. When making a hole in the printed circuit board 30, the dust collector 27 operates to set the space 25 to a negative pressure and collect the processing waste.

  When a hole is made in the printed circuit board 30 with the drill 20, the housing 10 rises and the spindle 21 also rises together. However, the pressure foot PF initially keeps the printed circuit board 30 pressed against the table 1 via the upper plate 31, but after the housing 10 is raised to some extent and the drill 20 comes out of the printed circuit board 30, When the cylinder 41 returns to its original length, it rises with the housing 10. Then, the lower end of the pressure foot PF (the lower end of the bush 23) is positioned at a position where it does not interfere with the upper plate 31. Finally, the drill 20 and the printed circuit board 30 are relatively moved in the horizontal direction by the cross slider 6 and the table 1, and the drill 20 is positioned at the next processing position.

  As described above, the printed circuit board drilling device 100 presses the upper plate 31 and the printed circuit board 30 against the table 1 by the pressure foot PF to cut the drill 20 into the upper plate 31, thereby making a hole in the printed circuit board 30. Therefore, the processing position accuracy can be improved.

Japanese Patent Laid-Open No. 10-29133 (see FIG. 1)

  By the way, the printed circuit board often has a non-uniform thickness in one printed circuit board. For this reason, when a plurality of printed circuit boards are stacked, a gap may be generated between the upper printed circuit board and the lower printed circuit board.

  When the position where the gap is generated is pressed with the pressure foot PF, the pressed position is inclined, and at least one of the upper plate 31 and the lower portion of the bush 23 serving as the work holding portion moves in the horizontal direction, and the upper plate 31 is moved. The work contact surface 23a of the bush 23 that is in contact is rubbed. Due to this rubbing, the workpiece contact surface 23a wears while the drilling process is repeated in a large number of printed boards. However, this wear does not always occur uniformly, and the workpiece contact surface 23a is often inclined.

  Therefore, the surface of the work contact surface 23a of the bush 23 that actually contacts the upper plate 1 becomes narrow, and when the pressure foot PF pressurizes the upper plate 1, the upper plate 1 is inclined, and the processing tool The tip of the drill 20 slid on the upper plate 31 and the machining position accuracy was lowered.

  Therefore, the operator has to frequently check the wear state of the workpiece contact surface, and the machining efficiency cannot be improved. Further, since the wear state of the work contact surface is usually examined by measuring the distance between the lower surface of the bush 23 and the surface of the table, it takes time to measure.

  An object of this invention is to provide the printed circuit board processing machine which enabled it to confirm the abrasion of a workpiece | work contact surface in a short time.

According to the first aspect of the present invention, there is provided a work pressing unit for pressing the work by means of a work pressing means (PF) for pressing the work, and for pressing a work tool (20) for processing the work into the work pressing means (PF). In the printed circuit board processing machine for processing the workpiece by penetrating the through hole (26) formed in (23),
Transfer means (61) for transferring the workpiece contact surface (23a) by contacting the workpiece contact surface (23a) of the workpiece pressing portion (23), which contacts the workpiece;
Measuring means (50, 51) for measuring the area of the workpiece contact surface (23a) transferred to the transfer means (61);
And a control means (52, 28) for stopping the processing of the workpiece by the processing tool (20) when the measurement area of the measuring means (50, 51) is less than a predetermined area. ).

  The invention according to claim 2 is the printed circuit board processing machine (200) according to claim 1, wherein the transfer means (61) is a pressure-sensitive sheet in which a portion where the work contact surface (23a) is pressed is changed in color. It is.

  The invention according to claim 3 is the printed circuit board processing machine (200) according to claim 1, wherein the transfer means (61) is a sheet to be transferred onto which the transfer agent applied to the work contact surface (23a) is transferred. ).

  In addition, the code | symbol in a parenthesis is attached | subjected for convenience and making it easy to contrast with drawing, Comprising: The structure of this invention is not limited at all.

  In the printed circuit board processing machine according to claim 1, the work contact surface is transferred to the transfer means, and the area of the transferred work contact surface is measured by the measurement means, and the measurement area becomes less than the predetermined area. Since the workpiece contact surface is judged to have worn so as to deviate the machining position of the workpiece, the distance between the workpiece contact surface and the table on which the workpiece is placed is measured. Unlike the conventional case where the wear state of the contact surface has been investigated, the wear state of the work contact surface can be detected quickly, and the workability of the device can be improved to improve the work efficiency of the work. Can do.

  Moreover, unlike the conventional case where the distance between the workpiece contact surface and the table on which the workpiece is placed is measured, the transfer state of the workpiece contact surface is measured, so that the wear state can be accurately detected. It is possible to maintain a high degree of machining position accuracy.

  In the printed circuit board processing machine according to claim 2, if the transfer means is a pressure-sensitive sheet in which the portion where the workpiece contact surface is pressed is changed in color, the wear state of the workpiece contact surface can be accurately measured. Thus, it is possible to accurately grasp the wear state of the work contact surface.

  The printed circuit board processing machine according to claim 3 can accurately measure the wear state of the workpiece contact surface when the transfer means is a transfer sheet onto which the transfer agent applied to the workpiece contact surface is transferred. Thus, the wear state of the workpiece contact surface can be accurately grasped.

  Hereinafter, a printed circuit board processing machine according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a printed circuit board drilling machine which is a printed circuit board processing machine according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a transfer example of the workpiece contact surface. The printed circuit board punching machine 200 of the present embodiment has a configuration in which a camera 50, an image processing device 51, a determination device 52, a cradle 60, and pressure-sensitive paper 61 are provided in the conventional printing punching device 100. Since the portions are the same as those of the conventional print punching machine 100, the same portions are denoted by the same reference numerals as those of the conventional print punching machine 100, and the description thereof is omitted. 4 is the same as the tip of the spindle of the printed circuit board drilling machine of the present embodiment, so FIG. 4 is also used as a diagram of the present embodiment. To do.

  The camera 50 is attached to the housing 10 so that the optical axis is parallel to the axis of the drill 20. The input side of the image processing device 51 is connected to the camera 50, and the output side is connected to the determination device 52. The output side of the determination device 52 is connected to the NC device 28. The camera 50 and the image processing device 51 constitute a measuring unit. The determination device 52 and the NC device 28 constitute control means.

  A cradle 60 is provided on the table 1. The cradle 60 can be replaced with a pressure sensitive paper 61 (for example, “Prescale” sold by FUJIFILM Business Supply Co., Ltd.), which is a transfer means that develops color according to the pressing force of the work contact surface 23a. It is provided. The lengths of the pressure sensitive paper 61 in the directions of arrows X and Y are set to be longer than the outer diameter D of the tip of the bush 23.

  Next, operation | movement of the printed circuit board drilling machine 200 of this embodiment is demonstrated.

  When the bush 23 is replaced with a new one or when a predetermined number of holes have been drilled, the operator removes the drill 20 from the spindle 21 and operates the NC device 28 to sense the axis of the spindle 21. The pressure paper 61 is positioned at a position not used for pressure measurement. Further, the operator operates the NC device 28 to lower the housing 10, press the bush 23 against the pressure sensitive paper 61, and move the spindle 21 to a position where the spindle 21 is lowered relative to the bush 23 by, for example, about 2 mm. At that time, the housing 10 is raised.

  When the housing 10 is lowered (pressurized), the pressure-sensitive paper 61 sandwiched between the lower surface of the bush 23 and the cradle 60 is pressurized and color is developed according to the applied pressure.

  FIG. 2 is a diagram illustrating a transfer example of the workpiece contact surface. The hatched portion is a colored portion, and the work contact surface is a portion in contact with the pressure sensitive paper 61. The portion not shaded is a portion where the workpiece contact surface is not in contact with the pressure sensitive paper 61 and is a portion that is worn more than the shaded portion.

  FIG. 2A is a transfer diagram when the entire workpiece contact surface comes into contact with the pressure sensitive paper 61, and shows that the workpiece contact surface is evenly worn. FIG. 2B is a transfer diagram when a part of the work contact surface is not in contact with the pressure-sensitive paper 61, and shows that a part of the work contact surface is worn much. FIG. 2C is a transfer diagram in the case where most of the workpiece contact surface is not in contact with the pressure-sensitive paper 61. A part of the workpiece contact surface is left and most of the workpiece contact surface is worn. Show. In this case, it is indicated that the workpiece contact surface does not completely serve as the workpiece contact surface. 2A, 2 </ b> B, and 2 </ b> C, portions indicated by reference numerals S <b> 1 a, S <b> 1 b, and S <b> 1 c are portions where the work contact surface is in contact with the pressure sensitive paper 61.

  Next, the relative movement between the cross slider 6 and the table 1 positions the optical axis of the camera 50 to the axis of the drill (spindle) in the portion of the pressure-sensitive paper 61 that has been pressurized this time. Image. The image processing device 51 binarizes the imaging data output from the camera 50, calculates the area of the image data, that is, the area S1 of the workpiece contact surface based on the binarized data, and the calculated result is NC. Output to the device 28. The NC device 28 is a value obtained by subtracting the area of the groove 24 from the area S1 and the area S of the design contact surface that has been input in advance (in the case of the figure, the annular area of the outer diameter D and the inner diameter d). For example, if (S1 / S) ≧ about 0.8, the drill 20 is mounted and the next machining is started. In other cases, when (S1 / S) <about 0.8, the NC device 28 displays an alarm and stops processing.

  When an alarm is displayed, the operator replaces the bushing 23 with a new one, re-grinds the lower surface of the bushing 23, or adjusts the length of the pair of connecting joints 40, and then the same as described above. After confirming that (S1 / S) ≧ 0.8, machining is resumed.

  In this embodiment, since the cradle 60 and the pressure sensitive paper 61 are sufficiently larger than the diameter D of the lower end of the bush 23, the replacement frequency of the pressure sensitive paper 61 can be reduced and the work efficiency can be improved.

  It is also possible to provide a means for replacing the pressure sensitive paper 61 and replace the pressure sensitive paper every time the area of the workpiece contact surface is confirmed.

  Further, in this embodiment, the work contact surface is confirmed by pressure-sensitive paper.For example, a transfer agent such as vermilion having a fluidity, a stamp ink, and the transfer agent are easily transferred. It is also possible to prepare a transfer sheet such as paper and transfer the workpiece contact surface to the transfer sheet in a so-called way of marking, and check the wear state of the workpiece contact surface.

  In the present embodiment, the determination is made based on the ratio of the transfer area S1a, S1b, S1c of the workpiece contact surface to the designed workpiece contact area S. For example, (S1 / S) <0. .8, when the inner diameter d portion (the portion excluding the edge of the through hole) 26a is in full contact with the through hole 26, it is often possible to continue processing in practice. Whether to continue the processing may be determined in consideration of not only the area but also the shape of the workpiece contact surface.

It is a perspective view of the printed circuit board drilling machine which is the printed circuit board processing machine of embodiment of this invention. It is a figure which shows the example of transcription | transfer of a workpiece contact surface. It is a perspective view of the printed circuit board drilling machine which is the conventional printed circuit board processing machine. FIG. 4 is a partial front cross-sectional view of a tip portion of a spindle in the printed circuit board drilling machine of FIGS. 1 and 3.

Explanation of symbols

S1 Actual area of workpiece contact surface PF Pressure foot (work holding means)
1 table 3 bed 6 cross slider 10 housing 11 Z-axis motor 12 ball screw 13 track 20 drill (working tool)
21 Spindle 22 Pressure foot body 23 Bush (work holding part)
23a Workpiece contact surface 24 Groove 26 Through hole 28 NC device (control means)
30 Printed Circuit Board 31 Upper Plate 40 Connection Joint 41 Air Cylinder 41a Piston Rod 50 Camera (Measuring Means)
51 Image processing device (measuring means)
52 Judgment device (control means)
60 cradle 61 pressure sensitive paper (transfer means)
100 Conventional Printed Circuit Board Processing Machine 200 Printed Circuit Board Processing Machine of the Present Invention

Claims (3)

A printed circuit board that processes the workpiece by penetrating a through hole formed in a workpiece pressing portion that presses the workpiece and presses the workpiece with a workpiece pressing means that holds the workpiece and processes the workpiece. In the processing machine,
Transfer means for transferring the workpiece contact surface by contacting the workpiece contact surface that contacts the workpiece of the workpiece pressing portion;
Measuring means for measuring the area of the workpiece contact surface transferred to the transfer means;
Control means for stopping machining of the workpiece by the machining tool when the measurement area of the measurement means is less than a predetermined area;
A printed circuit board processing machine comprising: The transfer means is a pressure-sensitive sheet in which a portion where the work contact surface is pressed is changed in color.
The printed circuit board processing machine according to claim 1. The transfer means is a transfer sheet onto which a transfer agent applied to the workpiece contact surface is transferred.
The printed circuit board processing machine according to claim 1.

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