TW202412972A - Drilling processing equipment - Google Patents

Abstract

[Topic] A drilling device having a rotating member on the lower surface of a presser foot is used to prevent the rotating member from rotating poorly due to chips accumulated in the gap between the lower surface of the presser foot and the rotating member. [Solution] A drilling device that processes a workpiece placed on the processing table with a drill bit held by the spindle by moving the processing table and the spindle relative to each other, and comprises: a press foot that is engaged with the spindle; a rotating member that is rotatably mounted on the lower surface of the press foot and has a plurality of bushings of different diameters; and an overall control unit that controls various parts of the device, wherein a cylindrical nozzle connected to a compressed air supply source and having a jet port at a predetermined height position is disposed on the processing table, and the overall control unit is controlled in such a manner that a gap between the press foot and the rotating member is located at a height position of the jet port, and compressed air is ejected from the jet port.

Description

Drilling equipment

The present invention relates to a drilling device for drilling a hole in a printed circuit board, and more particularly to a drilling device having a rotating member on the lower surface of a press foot, wherein the rotating member has a plurality of bushings with different inner diameters.

In the past, as disclosed in Patent Documents 1 and 2, a drilling processing device is known, in which a rotating member having a plurality of bushings with different inner diameters is provided on the lower surface of a press foot, and a bushing whose inner diameter matches the diameter of a drill bit used for processing is selected for processing. In addition, as disclosed in Patent Document 3, a processing device is known, in which a hole for chip discharge is provided on the press foot, and chips generated during processing are removed by suction with a dust collecting device through a hose connected thereto. [Known Technical Document] [Patent Document]

[Patent Document 1] Japanese Patent Publication No. 2015-168031 [Patent Document 2] Japanese Patent Publication No. 2008-290193 [Patent Document 3] Japanese Patent Publication No. 2002-144188

[Problem to be solved by the invention] Here, in a drilling processing device having a rotating member on the lower surface of the presser foot, even if the dust collecting device is used to remove the chips during processing, there may be a situation where fine chips that cannot be completely sucked by the dust collecting device are accumulated in the gap between the presser foot and the rotating member, and the presser foot cannot rotate. In this case, the processing device may stop due to detection of an abnormality, and processing cannot be performed until the chips are cleaned and removed, resulting in a problem of reduced productivity.

[Technical means to solve the problem] In order to solve the above-mentioned problem, the present invention is a drilling processing device, which processes the workpiece placed on the processing table with a drill head held by the spindle by moving the processing table and the spindle relative to each other, and is characterized in that it has: a press foot, which is engaged with the spindle; a rotating member, which is rotatably mounted on the lower surface of the press foot and has a plurality of bushings of different diameters; and an overall control unit, which controls various parts of the device, wherein a cylindrical nozzle connected to a compressed air supply source and provided with a jet at a predetermined height position is provided on the processing table, and the overall control unit is controlled in such a way that the gap between the press foot and the rotating member is located at the height position of the jet, and compressed air is ejected from the jet.

[Effect of the invention] According to the present invention, since the fine chips accumulated in the gap between the presser foot and the rotating member can be effectively removed, it is possible to prevent the processing device from stopping due to poor rotation of the rotating member, and to improve productivity.

[Example 1] Below, the first embodiment of the present invention is described using drawings. FIG. 1 is a schematic diagram showing the structure of a drilling processing device in the first embodiment of the present invention. In FIG. 1, a processing table 2 is provided on a device base 1 serving as a base, on which a printed substrate 3 serving as a workpiece is placed and driven in the X direction. A slide table 5 driven in the Y direction is installed in a portal column 4 mounted on the device base 1. In this slide table 5, a housing 6 supporting a spindle 7 and driven in the Z direction is installed. In addition, a press foot 30 is connected to the housing 6. In addition, the processing table 2, the slide table 5, and the housing 6 are driven in their respective directions by a driving portion not shown in the figure. Symbol 9 is a sub-chuck mounted on the housing 6. Symbols 10, 11, and 12 are respectively a supply clamping column, a discharge clamping column, and a drill cassette for distinguishing and accommodating new drill bits and old drill bits, which are respectively arranged on the processing table 2. In addition, the sub-chuck 9 can hold the drill bit at the front end and move the drill bit between the drill cassette 12 and the clamping column 10 or 11. In addition, a blower unit 40 is provided in the processing table 2. The drilling processing device is a drilling processing device that processes the workpiece (printed substrate 3) mounted on the processing table 2 with the drill bit held by the spindle 7 by moving the processing table 2 and the spindle 7 relative to each other.

Reference numeral 20 is an overall control unit for controlling various parts of the drilling processing device. The overall control unit 20 is configured, for example, to control the processing table 2, the slide table 5, and the drive unit of the housing 6 with a program-controlled processing device as the center. In addition, the overall control unit 20 also controls the air valve 45 and the rotating member drive unit described later.

Fig. 2 is a schematic cross-sectional view of the vicinity of the press foot in the first embodiment of the present invention. A press foot 30 for pressing the printed circuit board 3 during the hole drilling process is engaged at the lower side of the main shaft 7. The press foot 30 is connected to the housing 6 through a cylinder 31.

The press foot 30 is provided with a discharge hole 32, which is connected to a dust collecting device 34 through a dust collecting pipe 33, and by activating the dust collecting device 34, the chips generated during the machining can be discharged. In addition, a lower through hole 35 is formed in the press foot 30 at a position concentric with the center axis of the main shaft 7, through which the drill bit 8 passes.

FIG3 is a schematic bottom view of the press foot and the rotating member of the drilling processing device in the first embodiment of the present invention. As shown in FIG2 and FIG3, on the lower surface of the press foot 30, the rotating member 36 is rotatably supported on the support shaft 37 through a bearing not shown in the figure. Two through holes 38 and 39 are formed in the rotating member 36, and bushings 38b and 39b with different inner diameters are fixed respectively. The rotating member 36 is connected to the rotating member driving part not shown in the figure, so that it can rotate in the R direction. The overall control unit 20 controls the rotating member driving unit, and selects one of the bushings 38b and 39b based on the diameter of the drill bit used for processing, and rotates the rotating member 36 and stops it at its position so that the center of the selected bushing coincides with the center of the lower through hole 35. Then, the substrate 3 is pressed against the processing table 2 through the selected bushing to perform processing. In addition, in the past, fine chips were easily accumulated in the gap between the press foot 30 and the rotating member 36, especially near the lower opening end of the lower through hole 35 shown by the dotted circle in FIG. 2, which became a cause of poor rotation.

FIG4 is a schematic cross-sectional view of the blower unit in the first embodiment of the present invention. As shown in FIG4, the blower unit 40 has an air block 41 fixed to the upper surface of the processing table 2, and a cylindrical nozzle 42 erected on the upper surface of the air block 41. Four nozzles 43a to 43d are provided at a predetermined height position on the outer side of the nozzle 42 at equal intervals. The nozzles 43a to 43d are formed as through holes perpendicular to the axis of the nozzle 42 in a plane parallel to the axis of the nozzle 42 or in a plane perpendicular to the axis, and reach the inner side of the nozzle 42. The internal space of the nozzle 42 is connected to an air supply source 44 for supplying compressed air through an air flow path formed inside the air block 41. An air valve 45 is provided between the air supply source 44 and the nozzle 42, and compressed air is ejected and stopped from the ejection ports 43a to 43d by opening and closing the air valve 45.

Next, the cleaning operation using the air blowing unit 40 is described. Before the rotating member 36 needs to be rotated, for example, before the drill bit 8 held by the spindle 7 is replaced with a drill bit of a different diameter, the overall control unit 20 controls the operation of each part as follows to clean the gap between the press foot 30 and the rotating member 36.

First, the processing table 2 and the sliding table 5 are moved relative to each other, and the center of the lower through hole 35 of the press foot 30 is located on the axis of the nozzle 42. Then, the housing 6 is lowered, as shown in FIG5, so that the injection ports 43a to 43d of the nozzle 42 are located at the height of the gap between the press foot 30 and the rotating member 36, and the air valve 45 is opened. In this way, compressed air is injected from the injection ports 43a to 43d and enters the gap between the press foot 30 and the rotating member 36, and the accumulated chips can be discharged by the wind pressure.

[Example 2] Next, the second embodiment of the present invention is described. The structure of the blower unit of this embodiment is different from that of the first embodiment, and the nozzle itself rotates when the air is ejected.

FIG. 6 is a schematic cross-sectional view of the air blowing unit in the second embodiment. FIG. 7 is a horizontal cross-sectional view of the injection port position of the nozzle in the second embodiment. In addition, in this embodiment, the same structure as the first embodiment is omitted. As shown in FIG. 6, the cylindrical nozzle 46 is provided with the air block 41 through bearings 48 and 49 so as to be rotatable around the axis of the nozzle 46.

As shown in Figs. 6 and 7, four ejection ports 47a to 47d are provided at equal intervals at predetermined height positions on the outer side surface of the ejection nozzle 46. Unlike the first embodiment, the ejection ports 47a to 47d are formed as through holes that reach the inner side surface of the ejection nozzle 46. The through holes are perpendicular to the axis in a plane parallel to the axis of the ejection nozzle 46 and are inclined at a predetermined angle relative to the axis in a plane perpendicular to the axis. In this way, each ejection port 47a to 47d is formed as a through hole inclined relative to the axis, so that when air is ejected, the ejection nozzle 46 rotates due to its reaction force.

In the first embodiment, since the nozzle is fixed, there is a possibility that a portion of the cleaning target area where the wind pressure is weak is generated because the nozzle is not facing the nozzle. However, in this embodiment, since the nozzle 46 rotates and the nozzle faces the entire cleaning target area, the portion with weak wind pressure can be eliminated and the chips can be discharged more effectively.

In the first and second embodiments described above, although the cleaning operation is performed before the drill bit is replaced with a drill bit of a different diameter, the present invention is not limited thereto, and the cleaning operation may be performed at any time point, such as when the processing time reaches a certain value or before or after processing.

Furthermore, the overall control unit can also control the presser foot to swing a predetermined amplitude in the vertical direction during air injection. In this way, even if the position of the gap between the presser foot and the rotating member and the height position of the injection port of the nozzle are offset due to the assembly of the components constituting the blower unit, air can be injected into the gap portion reliably by swinging it up and down.

1: Device base 2: Processing table 3: Printed circuit board 4: Gate column 5: Slide table 6: Housing 7: Spindle 8: Drill head 9: Sub-chuck 10: Supply clamping column 11: Discharge clamping column 12: Drill head cassette 20: Overall control unit 30: Press foot 31: Cylinder 32: Discharge hole 33: Dust collecting pipe 34: Dust collecting device 35: Lower through hole 36: Rotating member 37: Support shaft 38,39: Through hole 38b,39b: Bushing 40: Blower unit 41: Air block 42,46: Nozzle 43a~43d,47a~47d: Injection port 44: Air supply source 45: Air valve 48,49: Bearing

FIG. 1 is a schematic diagram of the drilling processing device in the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the vicinity of the press foot in the first embodiment of the present invention. FIG. 3 is a schematic bottom view of the press foot and the rotating member in the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the blower unit in the first embodiment of the present invention. FIG. 5 is a diagram illustrating the positional relationship between the nozzle and the press foot during the cleaning action in the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the blower unit in the second embodiment of the present invention. FIG. 7 is a horizontal cross-sectional view of the nozzle position of the nozzle in the second embodiment of the present invention.

8: Drill bit

30: Foot press

35: Bottom through hole

36: Rotating component

38:Through hole

38b: lining

42: Spray nozzle

43a~43d: Injection port

Claims (3)

A drilling device, which processes a workpiece placed on the processing table with a drill head held by the spindle by moving the processing table and the spindle relative to each other, is characterized in that it has: a press foot, which is engaged with the spindle; a rotating member, which is rotatably mounted on the lower surface of the press foot and has a plurality of bushings of different diameters; and an overall control unit, which controls various parts of the device, wherein a cylindrical nozzle connected to a compressed air supply source and having a jet at a predetermined height position is disposed on the processing table, and the overall control unit is controlled in such a way that the gap between the press foot and the rotating member is located at the height position of the jet and compressed air is jetted from the jet. As in claim 1, the drilling apparatus, wherein the nozzle is configured to be rotatable about the axis of the nozzle. A drilling apparatus as claimed in claim 2, wherein the ejection port is formed as a through hole which is perpendicular to the axis line in a plane parallel to the axis line of the ejection nozzle and which is inclined to the axis line in a plane perpendicular to the axis line of the ejection nozzle.

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