Drilling equipment

Abstract

To provide a drilling processing device having a turning member on a lower surface of a pressure foot, which can prevent the turning member from being poorly turned due to chips accumulated in a gap between the lower surface of the pressure foot and the turning member.SOLUTION: A drilling processing device comprises a pressure foot 30 engaging with a spindle, a turning member 36 having a plurality of bushes 38b with different diameters turnably mounted on a lower surface of the pressure foot, and an overall control part that controls sections of the device, in which a cylindrical nozzle 42 connected to a supply source for compressed air and having jet orifices 43a-c formed at predetermined height positions thereof is arranged on a processing table, where the overall control part performs control so that a gap between the pressure foot and the turning member is positioned at the height position of the jet orifices to jet compressed air through the jet orifices.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a drilling device for drilling holes in a workpiece such as a printed circuit board, and more particularly to a drilling device having a rotating member with a plurality of bushes with different inner diameters on the underside of a pressure foot. [Background technology]

[0002] Conventionally, drilling machines have been known in which a rotating member having a plurality of bushes with different inner diameters is provided on the underside of a pressure foot, and a bush with an inner diameter suitable for the diameter of the drill used for drilling is selected for drilling, as disclosed in Patent Document 1 and 2. Also, as disclosed in Patent Document 3, a drilling machine is known in which a hole for discharging chips is provided in the pressure foot, and chips generated during drilling are sucked and removed by a dust collector via a hose connected to the hole. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-168031 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-290193 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-144188 Summary of the Invention [Problem to be solved by the invention]

[0004] In drilling machines that have a rotating member on the underside of the pressure foot, even if chips are removed by a dust collector during drilling, fine chips that cannot be removed by the dust collector can accumulate in the gap between the pressure foot and the rotating member, preventing the machine from rotating. In such cases, the machine detects an abnormality and stops, making it impossible to drill until the machine is cleaned and the chips are removed, resulting in reduced productivity. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a drilling device that processes a workpiece placed on a processing table with a drill held by the spindle by moving the processing table and the spindle relative to each other, the drilling device comprising: a pressure foot engaged with the spindle; a rotating member rotatably attached to the underside of the pressure foot and having a plurality of bushes of different diameters; and an overall control unit that controls each part of the device; wherein a cylindrical nozzle connected to a compressed air supply source and having an outlet at a predetermined height is provided on the processing table; and the overall control unit controls the gap between the pressure foot and the rotating member to be positioned at the height of the outlet, and to inject compressed air from the outlet. [Effects of the Invention]

[0006] According to the present invention, it is possible to effectively remove fine chips accumulated in the gap between the pressure foot and the rotating member, thereby preventing the machining device from stopping due to poor rotation of the rotating member and improving productivity. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic configuration diagram of a drilling device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view of the vicinity of a pressure foot in the first embodiment of the present invention. [Figure 3] FIG. 2 is a schematic bottom view of a pressure foot and a rotating member in the first embodiment of the present invention. [Figure 4] 1 is a schematic cross-sectional view of an air blow unit according to a first embodiment of the present invention. [Figure 5] 5A and 5B are diagrams illustrating the positional relationship between a nozzle and a pressure foot during a cleaning operation in the first embodiment of the present invention. [Figure 6] FIG. 5 is a schematic cross-sectional view of an air blow unit according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a horizontal cross-sectional view of the nozzle outlet position in the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION [Example]

[0008] A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a drilling machine according to the first embodiment of the present invention. In FIG. 1, a workpiece (printed circuit board 3) is placed on a machine base 1, which serves as a base. A machining table 2 is mounted on the machine base 1 and driven in the X direction. A cross slide 5 driven in the Y direction is mounted on a gantry column 4 attached to the machine base 1. A housing 6 supporting a spindle 7 and driven in the Z direction is mounted on the cross slide 5. A pressure foot 30 is connected to the housing 6. The machining table 2, cross slide 5, and housing 6 are driven in their respective directions by a drive unit (not shown). 9 denotes a sub-chuck attached to the housing 6. 10, 11, and 12 denote a supply tool post, a discharge tool post, and a drill cassette for storing new and old drills separately, respectively. These are installed on the machining table 2. The sub-chuck 9 can hold a drill at its tip and moves the drill between the drill cassette 12 and the tool post 10 or 11. In addition, an air blow unit 40 is installed on the processing table 2.

[0009] Reference numeral 20 denotes an overall control unit that controls each part of the drilling device. The overall control unit 20 is configured, for example, around a program-controlled processing device, and controls the drive units for the machining table 2, cross slide 5, and housing 6. It also controls an air valve 45 and a rotary member drive unit, which will be described later.

[0010] 2 is a schematic cross-sectional view of the vicinity of the pressure foot in the first embodiment of the present invention. A pressure foot 30 is engaged with the lower side of the spindle 7 to press the printed circuit board 3 during drilling. The pressure foot 30 is connected to the housing 6 via a cylinder 31.

[0011] The pressure foot 30 is provided with a discharge hole 32 which is connected to a dust collector 34 via a dust collection pipe 33, and by operating the dust collector 34, chips generated during machining can be discharged. In addition, the pressure foot 30 is formed with a lower through-hole 35, through which the drill 8 passes, at a position concentric with the central axis of the spindle 7.

[0012] FIG. 3 is a schematic bottom view of the pressure foot and rotating member of the drilling device according to the first embodiment of the present invention. As shown in FIGS. 2 and 3, a rotating member 36 is rotatably supported on a support shaft 37 via a bearing (not shown) on the underside of the pressure foot 30. Two through holes 38 and 39 are formed in the rotating member 36, and bushings 38b and 39b with different inner diameters are fixed to the through holes. The rotating member 36 is connected to a rotating member drive unit (not shown) and is rotatable in the R direction. The overall control unit 20 controls the rotating member drive unit to select either bushing 38b or 39b based on the diameter of the drill used for processing, rotates the rotating member 36 so that the center of the selected bushing is aligned with the center of the lower through hole 35, and stops the rotating member 36 at that position. Then, the substrate 3 is pressed against the processing table 2 via the selected bushing to perform processing. In the past, fine chips were prone to accumulate in the gap between the pressure foot 30 and the rotating member 36, particularly near the lower opening end of the lower through-hole 35 shown in the dashed circle in Figure 2, causing poor rotation.

[0013] FIG. 4 is a schematic cross-sectional view of an air blow unit according to a first embodiment of the present invention. As shown in FIG. 4, the air blow unit 40 includes 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 nozzle holes 43a-d are provided at equal intervals on the outer surface of the nozzle 42 at a predetermined height. The nozzle holes 43a-d are formed as through-holes perpendicular to the axial line of the nozzle 42, both in a plane parallel to the axial line of the nozzle 42 and in a plane perpendicular thereto, and reach the inner surface of the nozzle 42. The interior space of the nozzle 42 is connected to an air supply source 44 that supplies compressed air via 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 opening and closing the air valve 45 starts and stops the ejection of compressed air from the nozzle holes 43a-d.

[0014] Next, we will explain the cleaning operation using the air blow unit 40. Before it becomes necessary to rotate the rotating member 36, for example, before replacing the drill 8 held by the spindle 7 with a drill of a different diameter, the overall control unit 20 controls each unit to operate as follows, and cleans the gap between the pressure foot 30 and the rotating member 36.

[0015] First, the machining table 2 and the cross slide 5 are moved relative to each other so that the center of the lower through-hole 35 of the pressure foot 30 is aligned with the axis of the nozzle 42. Next, the housing 6 is lowered, and as shown in FIG. 5, the outlets 43a to 43d of the nozzle 42 are positioned at the height of the gap between the pressure foot 30 and the rotating member 36, and the air valve 45 is opened. Compressed air is then ejected from the outlets 43a to 43d, entering the gap between the pressure foot 30 and the rotating member 36, and the air pressure causes the accumulated chips to be expelled. [Example]

[0016] Next, a second embodiment of the present invention will be described. This embodiment differs from the first embodiment in the configuration of the air blow unit, in that the nozzle itself rotates when spraying air.

[0017] Fig. 6 is a schematic cross-sectional view of an air blow unit in the second embodiment, and Fig. 7 is a horizontal cross-sectional view of the nozzle outlet position in the second embodiment. Note that in this embodiment, explanations of configurations that are the same as those in the first embodiment will be omitted. As shown in Fig. 6, a cylindrical nozzle 46 is installed on an air block 41 via bearings 48 and 49 so as to be rotatable about the axis of the nozzle 46.

[0018] 6 and 7, four jet ports 47a to 47d are provided at a predetermined height on the outer surface of the nozzle 46, spaced at equal intervals from one another. Unlike the first embodiment, the jet ports 47a to 47d are formed as through-holes that are perpendicular to the axial line of the nozzle 46 in a plane parallel to the axial line, and are inclined at a predetermined angle relative to the axial line in a plane perpendicular to the axial line, and reach the inner surface of the nozzle 46. Because the jet ports 47a to 47d are thus formed as through-holes inclined relative to the axial line, when air is jetted, the nozzle 46 rotates due to the reaction force.

[0019] In the first embodiment, the nozzle is fixed, which means that there is a possibility that some areas of the cleaning area will not face the jet nozzle and will have weak air pressure. However, in this embodiment, the nozzle 46 rotates, so the jet nozzle faces the entire cleaning area, eliminating areas with weak air pressure and enabling chips to be discharged more effectively.

[0020] In the first and second embodiments described above, the cleaning operation is performed before replacing the drill with one of a different diameter, but the present invention is not limited to this. The cleaning operation may be performed at any timing, such as when the machining time reaches a certain value, or before or after machining.

[0021] The overall control unit may also control the pressure foot to swing up and down a predetermined distance during air injection. In this way, even if the position of the gap between the pressure foot and the rotating member and the height position of the nozzle outlet are misaligned due to the assembly of the components that make up the air blow unit, the vertical swinging motion will ensure that air is injected into the gap. [Explanation of symbols]

[0022] 1: Machine base, 2: Processing table, 3: Printed circuit board, 4: Gate column, 5: Cross slide, 6: Housing, 7: Spindle, 8: Drill, 9: Sub-chuck, 10: Supply tool post, 11: Discharge tool post, 12: Drill cassette, 20: Overall control unit, 30: Pressure foot, 31: Cylinder, 32: Discharge hole, 33: Dust collection pipe, 34: Dust collector, 35: Lower through-hole, 36: Rotating member, 37: Support shaft, 38, 39: Through-hole, 38b, 39b: Bushing, 40: Air blow unit, 41: Air block, 42, 46: Nozzle, 43a-d, 47a-d: Injection port, 44: Air supply source, 45: Air valve, 48, 49: Bearing

Claims

1. A drilling apparatus for machining a workpiece placed on a machining table with a drill held by the spindle by moving a machining table and a spindle relative to each other, the drilling apparatus comprising: a pressure foot engaged with the spindle; a rotating member rotatably attached to a lower surface of the pressure foot and having a plurality of bushes with different diameters; and an overall control unit for controlling each unit of the apparatus, a cylindrical nozzle connected to a compressed air supply source and having an ejection port at a predetermined height is provided on the processing table; the overall control unit controls the pressure foot and the rotary member to be positioned at a height position of the injection port, and controls the compressed air to be injected from the injection port. A drilling device characterized by:

2. The nozzle is provided rotatably around the axis of the nozzle.

2. The drilling device according to claim 1.

3. The injection port is formed as a through hole that is perpendicular to the axis of the nozzle in a plane parallel to the axis of the nozzle and is inclined with respect to the axis of the nozzle in a plane perpendicular to the axis of the nozzle.

3. The drilling device according to claim 2.

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