Drilling machine

Abstract

The present invention provides a drilling apparatus capable of detecting a decrease in the holding force that temporarily holds the drill, thereby preventing a decrease in the efficiency of the drilling process. [Solution] The drilling apparatus comprises a spindle for rotating a drill held in a first holding part, a tool post having a second holding part for temporarily holding the drill when replacing the drill held in the first holding part, a drive mechanism that allows the spindle to move between a holding position in which the first holding part can hold the drill temporarily held in the second holding part and a release position, a detection means for detecting a drive current that drives the drive mechanism in the process of moving the spindle from the holding position to the release position while the drill temporarily held in the second holding part is held in the first holding part, and a determination means for determining the holding force of the temporary holding by the tool post based on the drive current detected by the detection means.

Description

Technical Field

[0001] The present invention relates to a drilling device for performing drilling on a printed circuit board or the like.

Background Art

[0002] Conventionally, a drilling device for performing drilling on a printed circuit board or the like is known. For example, as described in Patent Document 1, the drilling device includes a tool post that temporarily holds (hereinafter referred to as "temporary holding") an old drill and a new drill when replacing the drill.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the tool post for temporarily holding the drill deteriorates over time due to repeated attachment and detachment of the drill, resulting in a decrease in the holding force for temporarily holding the drill. When performing a drill replacement operation on the drilling device, a new drill is attached to the spindle while being temporarily held by the tool post. At this time, if the holding force of the tool post is reduced, the position of the new drill is unstable and cannot be attached to the spindle. Therefore, the drill replacement operation cannot be performed, and the drilling process is interrupted, resulting in a problem of reduced efficiency of the drilling process by the drilling device.

[0005] An object of the present invention is to provide a drilling device capable of detecting a decrease in the holding force for temporarily holding a drill and preventing a decrease in the efficiency of the drilling process.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a drilling apparatus comprising: a spindle for rotating a drill held in a first holding part, a tool post located coaxially with the spindle and having a second holding part for temporarily holding a drill when replacing the drill held in the first holding part; and a drive mechanism that moves the spindle between a holding position in which the first holding part can hold a drill temporarily held in the second holding part and a separation position away from the holding position, along the axial direction of the spindle, wherein the drilling apparatus provides a detection means for detecting a drive current that drives the drive mechanism in the process of holding the drill temporarily held in the second holding part in the first holding part and moving the spindle from the holding position to the separation position by the drive mechanism, and a determination means for determining the holding force of the temporary holding by the tool post based on the drive current detected by the detection means. [Effects of the Invention]

[0007] According to the present invention, it is possible to detect a decrease in the holding force that temporarily holds the drill, thereby preventing a decrease in the efficiency of the drilling process. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of a drilling apparatus according to an embodiment. [Figure 2] This is a longitudinal cross-sectional view of the main parts of the spindle and toolpost, showing the state in which the drill is temporarily held in the toolpost and the spindle is in the separated position (A) and the held position (B). [Figure 3] This is a block diagram illustrating the schematic electrical configuration of a drilling machine. [Figure 4] This is a longitudinal cross-sectional view of the main parts of the spindle and toolpost, showing the spindle holding the drill in the holding position (A) and the spindle moving away from the holding position (A). [Figure 5]This timing chart shows the spindle vertical drive current, illustrating the conditions when the tool post holding force is appropriate (A) and when the holding force is insufficient (B). [Modes for carrying out the invention]

[0009] [Configuration of a drilling machine] As shown in Figure 1, the drilling apparatus 1 according to the present invention comprises an apparatus base 11, a processing table 12, and a gantry-type column 13. The processing table 12 is driven in the X direction by an XY direction drive mechanism 46 (see Figure 3) on the apparatus base 11. Multiple printed circuit boards 10, which are to be processed, are placed on the processing table 12 (two in this embodiment).

[0010] The gantry column 13 is mounted on the device base 11. The gantry column 13 is positioned to straddle the machining table 12, and a cross slide 15, driven in the Y direction by an XY direction drive mechanism 46, is mounted on one of the vertical surfaces of the gantry column 13. Multiple spindles 16 are provided on the cross slide 15.

[0011] Each spindle 16 corresponds to a printed circuit board 10 placed on the processing table 12 and is slidably mounted on the gantry column 13. The multiple spindles 16 are driven synchronously in the vertical direction (Z direction) by a spindle vertical drive mechanism 45 (see Figure 3).

[0012] A drill 17 is held on the spindle 16. The drill 17 is used to drill holes in the printed circuit board 10. A sub-chuck 18 is attached to the spindle 16. The sub-chuck 18 moves in the Z direction together with the spindle 16. A supply tool post 19, an ejection tool post 20, a drill cassette 21, and a drill inspector 22 are installed on the processing table 12. The drill cassette 21 stores new and old drills separately. The drill inspector 22 has the function of detecting the diameter and cutting edge position of the drill 17 held by the spindle 16, and is operated by inserting the drill 17 from above. The supply tool post 19, ejection tool post 20, drill cassette 21, and drill inspector 22 are each installed near the printed circuit board 10 to be processed, corresponding to the spindle 16.

[0013] Each part of the drilling machine 1 is controlled by a control device 25. The control device 25 is implemented, for example, by a program-controlled processor. A display unit 26 is connected to the control device 25. The display unit 26 displays various information to be communicated to the operator.

[0014] The control device 25 includes a storage unit 27. The storage unit 27 stores programs, display data, and predetermined thresholds, and is, for example, a non-volatile memory. The control device 25 detects the drive current of the spindle vertical drive mechanism 45 when the spindle 16 withdraws the drill 17 from the supply tool post 19, and determines the holding force of the drill 17 by the supply tool post 19 based on the detected drive current. These controls performed by the control device 25 will be described later.

[0015] [Spindle 16 configuration] As shown in Figures 2(A) and 2(B), the spindle 16 comprises a rotor shaft 31, a collet chuck 32 (first holding part), a spring 33, a guide bush 34, and a piston rod 35. The spindle 16 is controlled by a control device 25 and has an integrated structure with a motor (not shown). The rotor shaft 31 is rotatably supported by bearings (not shown). The rotor shaft 31 is coupled to a rotor (not shown). The rotor is rotatable relative to a stator coil (not shown), and when power is supplied to the stator coil under the control of the control device 25, the rotor and rotor shaft 31 rotate together. As a result, rotation is transmitted from the motor to the rotor shaft 31.

[0016] The rotor shaft 31 has a first tapered surface 31A formed on its inner circumferential surface. The first tapered surface 31A is a tapered surface whose inner diameter widens towards the lower end of the rotor shaft 31 (the side where the drill 17 is located). The collet chuck 32 is provided at the lower end of the rotor shaft 31, specifically at a position surrounded by the inner circumferential surface of the rotor shaft 31. The spring 33 is provided inside the rotor shaft 31.

[0017] The collet chuck 32 is connected to the piston rod 35 via a guide bush 34. The guide bush 34 is slidably fitted to the rotor shaft 31 in the axial direction (Z direction). This restricts the radial movement of the piston rod 35. The rotor shaft 31, collet chuck 32, and drill 17 are arranged coaxially. When a new drill 17 is held in the collet chuck 32, the supply tool post 19 is also arranged coaxially with the rotor shaft 31 and the collet chuck 32. Therefore, in the following, the axial direction of the rotor shaft 31, collet chuck 32, drill 17, and supply tool post 19 will simply be referred to as "axial direction". Furthermore, in the following, the axial direction from the rotor shaft 31 toward the drill 17 attached to the collet chuck 32 will be defined as "downward", and the opposite side will be defined as "upward".

[0018] The spring 33 is provided inside the rotor shaft 31. Specifically, the spring 33 is disposed between the abutting surface 31B provided near the lower end on the inner peripheral side of the rotor shaft 31 and the guide bush 34. Thereby, the spring 33 biases the collet chuck 32, via the guide bush 34, toward the closed state described later, that is, toward the upper end side in the axial direction (opposite side to the drill 17).

[0019] The piston rod 35 is coupled to a pressing mechanism (not shown). The pressing mechanism is, for example, an air cylinder, and presses the piston rod 35 toward the open state described later, that is, toward the lower end side in the axial direction, against the biasing force of the spring 33. When the pressing mechanism presses the piston rod 35, the collet chuck 32 moves toward the lower end side in the axial direction. Further, when the pressing mechanism releases the pressing on the piston rod 35, the collet chuck 32 moves toward the upper end side in the axial direction due to the biasing force of the spring 33.

[0020] [Configuration of the collet chuck 32] The collet chuck 32 has a second tapered surface 32A, a plurality of slits 32B arranged parallel to the axial direction, and an inner peripheral surface 32C adapted to the outer peripheral surface of the drill 17. The second tapered surface 32A is formed on the outer peripheral surface of the collet chuck 32 and expands toward the lower end of the collet chuck 32. The second tapered surface 32A contacts the first tapered surface 31A of the rotor shaft 31.

[0021] When the collet chuck 32 is pressed toward the lower end side by the pressing mechanism via the piston rod 35, it protrudes from the lower end of the rotor shaft 31 against the biasing force of the spring 33. When the collet chuck 32 protrudes from the lower end of the rotor shaft 31, the second tapered surface 32A separates from the first tapered surface 31A and the dimension in the radial direction expands, and it becomes an open state (the state shown in Fig. 2(A)). When the inner diameter of the inner peripheral surface 32C of the collet chuck 32 expands, the collet chuck 32 separates from the outer peripheral surface of the drill 17 and can release the holding of the drill 17.

[0022] On the other hand, when the pressure from the pressing mechanism via the piston rod 35 is released, the collet chuck 32 receives bias from the spring 33 toward the upper end in the axial direction, as described above. As a result, the collet chuck 32 retracts into the rotor shaft 31, causing the second tapered surface 32A to be pressed against the first tapered surface 31A, reducing its radial dimension and putting it into a closed state (as shown in Figures 4(A) and 4(B)). The collet chuck 32, by reducing the inner diameter of its inner circumferential surface 32C, comes into close contact with the outer circumferential surface of the drill 17, holding the drill 17 facing downwards. "Downward" means that the tip of the drill 17, where the drill bit is formed, is located downwards, and the base end held by the collet chuck 32 is located upwards.

[0023] By holding the drill 17 in the collet chuck 32, rotation is transmitted from the motor of the spindle 16 to the drill 17 via the rotor shaft 31 and the collet chuck 32. In the drilling machine 1, when replacing the drill 17 held in the collet chuck 32 with a new one, the drill 17 is temporarily held in the supply tool post 19. "Temporary holding" refers to the temporary holding during the drill replacement operation in the drilling machine 1.

[0024] [Structure of Drill 17] In this embodiment, the drill 17 has a ring 30 attached to its outer circumferential surface. The ring 30 is positioned between the tip portion of the drill 17 where the drill bit is formed and the base portion held by the collet chuck 32. The ring 30 is made of, for example, a hard synthetic resin.

[0025] [Configuration of the supply toolpost 19] As shown in Figures 2(A) and 2(B), the supply tool post 19 consists of a sleeve 51, a holder 52, and a spring 53. The supply tool post 19 is located below the spindle 16. The discharge tool post 20 has the same configuration as the supply tool post 19, and its description is omitted.

[0026] The inner circumferential surface of the sleeve 51 has a small-diameter section 56a and a large-diameter section 56b. The small-diameter section 56a is an opening located on the upper end side in the axial direction of the sleeve 51. The large-diameter section 56b is coaxially connected to the end of the small-diameter section 51a and has a larger inner diameter than the small-diameter section 51a.

[0027] The holder 52 is positioned inside the sleeve 51. The outer circumferential surface of the holder 52 has a small diameter portion 57a ​​and a large diameter portion 57b. The large diameter portion 57b has an outer diameter slightly smaller than the large diameter portion 56b of the sleeve 51, and its axial length is shorter than the large diameter portion 56b of the sleeve 51. The small diameter portion 57a ​​is coaxially connected to the end of the large diameter portion 57b. The small diameter portion 57a ​​has an outer diameter slightly smaller than the small diameter portion 56a of the sleeve 51, and its axial length is longer than the axial length of the small diameter portion 56a of the sleeve 51. The small diameter portion 57a ​​protrudes from the upper end of the sleeve 51.

[0028] The holder 52 has a fitting hole 57c (second holding portion) and a storage hole 57d formed inside. The fitting hole 57c is an opening located on the upper end side in the axial direction of the holder 52. The storage hole 57d is coaxially connected to the fitting hole 57c and has a smaller inner diameter than the fitting hole 57c. In addition, the small diameter portion 57a ​​of the holder 52 has multiple slits 57e (see Figure 4(B)) that penetrate radially through a portion of the fitting hole 57c and the storage hole 57d.

[0029] The fitting hole 57c engages with the ring 30 of the drill 17. This allows the holder 52 to temporarily hold the drill 17. In other words, the engagement force between the fitting hole 57c and the ring 30 is the holding force of the drill 17 by the supply tool post 19. If the holder 52 deteriorates over time, for example, due to wear on the surface of the fitting hole 57c, the holding force of the drill 17 will decrease. The tip of the drill 17 is stored in the storage hole 57d. The orientation in which the holder 52 temporarily holds the drill 17 is the same as the orientation in which the collet chuck 32 holds the drill 17, which is "downward".

[0030] The spring 53 is located inside the sleeve 51 and between the holder 52 and the machining table 12. The spring 53 biases the holder 52 upward. Due to the biasing from the spring 53, the upper end of the large diameter portion 57b of the holder 52 comes into contact with the upper end of the large diameter portion 56b of the sleeve 51.

[0031] When the holder 52 is pressed from above, it descends against the biasing force of the spring 53. In other words, the small diameter portion 57a ​​of the holder 52 is pushed into the inside of the sleeve 51. The pressure on the holder 52 from above compresses the spring 53, biasing the holder 52 upward.

[0032] [Electrical configuration of control device 25] Next, the electrical configuration of the control device 25 will be explained using Figure 3. As shown in Figure 3, the control device 25 controls each part of the drilling machine 1 by reading and executing a control program that is pre-stored in the memory unit 27. The control device 25 includes a spindle vertical drive control unit 41 (detection means), a spindle control unit 42, an XY direction drive control unit 43, and a determination unit 44 (determination means).

[0033] The spindle control unit 42 controls the motor and pressing mechanism of the spindle 16. In other words, the spindle control unit 42 controls the rotation of the rotor shaft 31 and the opening and closing of the collet chuck 32.

[0034] The XY direction drive control unit 43 controls the drive of the XY direction drive mechanism 46. As described above, the XY direction drive mechanism 46 drives the machining table 12 in the X direction and drives the cross slide 15 on which the spindle 16 is provided in the Y direction. In other words, the XY direction drive mechanism 46 changes the relative position of the spindle 16 and the machining table 12 in the X and Y directions.

[0035] The spindle vertical drive control unit 41 controls the drive of the spindle vertical drive mechanism 45. The spindle vertical drive mechanism 45 is a mechanism that moves the spindle 16 along the axial direction and is composed of, for example, an electric cylinder. The spindle vertical drive mechanism 45 can move the spindle 16 between a holding position (described later) and a separation position (away from the holding position).

[0036] The spindle vertical drive control unit 41 operates the spindle vertical drive mechanism 45 when replacing the drill 17 held in the collet chuck 32. More specifically, when the collet chuck 32 holds the drill 17 which has been temporarily held in the supply tool post 19, the spindle vertical drive control unit 41 provides feedback control of the drive current (hereinafter referred to as the spindle vertical drive current) that drives the spindle vertical drive mechanism 45 to move the spindle 16 in the direction of pulling the drill 17 out of the supply tool post 19 (upwards).

[0037] The spindle vertical drive control unit 41 calculates the amount of movement of the spindle 16 per unit time based on the axial position of the spindle 16 detected by the position detection sensor 47. The position detection sensor 47 is composed of, for example, a magnetic sensor. However, if the spindle vertical drive mechanism 45 is an electric cylinder, the amount of movement of the spindle 16 per unit time may be calculated from the rotation angle of the rotating body constituting the electric cylinder. In this case, a rotation angle sensor is provided to detect the rotation angle of the rotating body. The rotation angle sensor is, for example, a rotary encoder.

[0038] The spindle vertical drive control unit 41, for example, provides feedback control to the spindle vertical drive mechanism 45 so that the amount of movement of the spindle 16 per unit time approaches the target amount of movement. More specifically, as feedback control, the spindle vertical drive control unit 41 monitors the amount of movement of the spindle 16 per unit time, and increases the spindle vertical drive current if the amount of movement per unit time is less than the target amount of movement, and decreases the spindle vertical drive current if the amount of movement per unit time is more than the target amount of movement. The target amount of movement is stored in advance in the storage unit 27.

[0039] The spindle vertical drive control unit 41 also functions as a detection unit for detecting the spindle vertical drive current. More specifically, the spindle vertical drive control unit 41 detects the spindle vertical drive current when the spindle vertical drive mechanism 45 moves the spindle 16 in the direction of pulling the drill 17 out of the supply tool post 19. The spindle vertical drive current detected by the spindle vertical drive control unit 41 is output to the determination unit 44.

[0040] The determination unit 44 determines the holding force of the temporary holding by the supply tool post 19 based on the spindle vertical drive current detected by the spindle vertical drive control unit 41. The determination of the holding force by the determination unit 44 will be described later.

[0041] [Drill replacement operation in drilling machine 1] The drill replacement procedure in the drilling machine 1 will be explained with reference to Figures 2, 4, and 5.

[0042] When performing a drill replacement operation on the drilling machine 1, the first step is to discharge the used old drill 17 into the discharge tool post 20. In this discharge step, the control device 25 drives the XY direction drive mechanism 46 under the control of the XY direction drive control unit 43, moving the machining table 12 in the X direction and the spindle 16 in the Y direction, and aligning the discharge tool post 20 with the position of the spindle 16.

[0043] Next, the control device 25 drives the spindle vertical drive mechanism 45 under the control of the spindle vertical drive control unit 41, lowering the spindle 16 to a position where the ring 30 of the old drill 17 fits into the fitting hole of the discharge tool post 20. After the ring 30 is fitted into the fitting hole of the discharge tool post 20, the control device 25 changes the collet chuck 32 from a closed state to an open state under the control of the spindle control unit 42. This releases the collet chuck 32 from holding the old drill 17.

[0044] After the collet chuck 32 releases the old drill 17, the control device 25 drives the spindle vertical drive mechanism 45 under the control of the spindle vertical drive control unit 41, causing the spindle 16 to move away from the discharge tool post 20. With the collet chuck 32 no longer holding the drill 17, the old drill 17 is held in the discharge tool post 20. This completes the discharge of the old drill 17. The old drill 17 held in the discharge tool post 20 is discarded after the drill replacement operation.

[0045] After the discharge process, a mounting process is performed to hold the new drill 17 in the collet chuck 32. In the mounting process, the operator fits the ring 30 of the new drill 17 into the fitting hole 57c of the supply tool post 19. In other words, the new drill 17 is temporarily held facing downwards in the supply tool post 19. Then, the control device 25 drives the XY direction drive mechanism 46 under the control of the XY direction drive control unit 43, moving the machining table 12 in the X direction and the spindle 16 in the Y direction, to align the supply tool post 19 with the spindle 16 at a position coaxial with the spindle 16 (the position shown in Figure 2(A)). At this time, the control device 25 also changes the collet chuck 32 from a closed state to an open state under the control of the spindle control unit 42.

[0046] Next, the control device 25 drives the spindle vertical drive mechanism 45 under the control of the spindle vertical drive control unit 41, lowering the spindle 16 to a holding position (shown in Figure 2(B)) where the new drill 17, which is temporarily held in place on the supply tool post 19, can be held by the collet chuck 32. When the spindle 16 is lowered to the holding position, the small diameter portion 57a ​​of the holder 52 is pushed into the inside of the sleeve 51. As the holder 52 is pressed, the spring 53 is compressed, biasing the holder 52 upward.

[0047] After lowering the spindle 16 to the holding position, the control device 25, under the control of the spindle control unit 42, changes the collet chuck 32 from an open state to a closed state. As a result, the collet chuck 32 reduces its radial dimension and holds the new drill 17 (position shown in Figure 4(A)). At this time, the collet chuck 32 retracts into the rotor shaft 31, releasing the pressure from the spindle 16 onto the holder 52. Therefore, the biasing force of the spring 53 returns the holder 52 to its initial position.

[0048] After the collet chuck 32 closes and holds the new drill 17, the control device 25 drives the spindle vertical drive mechanism 45 under the control of the spindle vertical drive control unit 41, moving the spindle 16 from the holding position to the release position (the position shown in Figure 4(B)). In other words, the spindle vertical drive mechanism 45 moves the spindle 16 upward, thereby pulling out the new drill 17 that was temporarily held in the fitting hole 57c. As a result, the new drill 17 is held in the drilling machine 1, and the replacement work is completed.

[0049] When moving the spindle 16 from the holding position to the release position, the control device 25 detects the spindle vertical drive current using the spindle vertical drive control unit 41. The determination unit 44 then determines the holding force of the temporary holding by the supply tool post 19 based on the spindle vertical drive current detected by the spindle vertical drive control unit 41. More specifically, the determination unit 44 determines that the holding force by the supply tool post 19 is appropriate if the peak value of the spindle vertical drive current exceeds a predetermined threshold, and determines that the holding force by the supply tool post 19 is insufficient if the spindle vertical drive current is below the predetermined threshold. The predetermined threshold is set, for example, to the lower limit of the spindle vertical drive current detected by the spindle vertical drive control unit 41 when the position of the drill 17 temporarily held by the supply tool post 19 is stable.

[0050] Figure 5(A) is a timing chart of the drive current when the holding force of the supply tool post 19 is appropriate. The determination unit 44 monitors the spindle vertical drive current IS from time t0 when the spindle 16 starts moving from the holding position to the release position. As described above, the spindle vertical drive control unit 41 increases the spindle vertical drive current IS in order to pull out the new drill 17 that is temporarily held in the supply tool post 19.

[0051] The spindle vertical drive mechanism 45 moves the spindle 16 against the holding force (fitting force) of the supply tool post 19 (fitting hole 57c). Therefore, if the holding force of the supply tool post 19 is strong, in other words, if the resistance when pulling out the new drill 17 is large, the amount of movement of the spindle 16 per unit time is small. Consequently, the spindle vertical drive current IS increases due to feedback control by the spindle vertical drive control unit 41. From time t0 when the spindle 16 starts to move, the holding force of the supply tool post 19 acts, and the spindle vertical drive current IS rises to its peak value P1.

[0052] After the spindle vertical drive current IS rises to its peak value P1, the holding force of the supply tool post 19 gradually weakens. In other words, the resistance to pulling out the new drill 17 gradually decreases, and the amount of movement of the spindle 16 per unit time gradually increases. Therefore, the spindle vertical drive current IS decreases from its peak value P1 due to the feedback control of the spindle vertical drive control unit 41.

[0053] As shown in Figure 5(A), if the peak value P1 of the spindle vertical drive current IS exceeds a predetermined threshold, the determination unit 44 determines that the holding force by the supply tool post 19 is appropriate (normal determination). If a normal determination is made, the control device 25 starts drilling holes in the printed circuit board 10 using the drilling device 1.

[0054] Figure 5(B) is a timing chart of the drive current when the holding force of the supply tool post 19 is insufficient. The determination unit 44 monitors the spindle vertical drive current IS from time t0 when the spindle 16 starts moving from the holding position to the release position. In order to move the spindle 16 against the holding force (fitting force) of the supply tool post 19 (fitting hole 57c), the spindle vertical drive current IS rises to its peak value P2. In this case, the holding force of the supply tool post 19 is weaker than when it is appropriate. In other words, the resistance when pulling out the new drill 17 is smaller and the amount of movement of the spindle 16 per unit time is greater than when the holding force of the supply tool post 19 is appropriate. Therefore, the peak value P2 of the spindle vertical drive current IS is also lower.

[0055] As shown in Figure 5(B), if the peak value P2 of the spindle vertical drive current IS is below a predetermined threshold, the determination unit 44 determines that the holding force of the supply tool post 19 is insufficient (error determination). When the determination unit 44 determines an error, the control device 25 issues a warning, such as by generating an error sound or displaying an error on the display unit 26, and stops the operation of the drilling machine 1. The operator recognizes that the holding force of the supply tool post 19 has decreased due to the stopping of the drilling machine 1 (machine stop) and the error determination warning. After replacing the supply tool post 19, the operator releases the stop of the drilling machine 1 by the control device 25 and restarts it.

[0056] [Effects of the Embodiment] According to the above embodiment, in the process of moving the spindle 16 from the holding position to the release position, the spindle vertical drive current is detected, and based on the detected spindle vertical drive current, the determination unit 44 determines the holding force by the supply tool post 19, so that the user can recognize that the holding force of the drill 17 by the supply tool post 19 has decreased. The user who recognizes the decrease in the holding force of the supply tool post 19 can perform maintenance such as replacing the supply tool post 19. If maintenance is not performed and the supply tool post 19 with reduced holding force of the drill 17 is used continuously, it will become impossible to replace the drill 17, and the efficiency of drilling by the drilling device 1 will decrease. In contrast, with the drilling device 1, the user can perform maintenance before it becomes impossible to replace the drill 17. Therefore, it is possible to prevent a decrease in the efficiency of drilling by the drilling device 1.

[0057] Furthermore, in the drilling device 1, the control device 25 issues a warning and stops the drilling device 1 if the peak value of the spindle vertical drive current exceeds a predetermined threshold, so the user can reliably recognize that the holding force of the drill 17 by the supply tool post 19 has decreased. Therefore, it is possible to prevent the use of a supply tool post 19 with reduced holding force of the drill 17, thereby preventing a decrease in the efficiency of drilling by the drilling device 1.

[0058] In the above embodiment, the configuration of the supply tool post 19 for temporarily holding the ring 30 of the drill 17 is illustrated, but it is not limited to this, and a supply tool post that temporarily holds the drill 17 by fitting it with the outer surface of the drill 17 may also be used, even if the drill 17 does not have a ring 30. Furthermore, the configuration of the spindle vertical drive mechanism is not limited to the electric cylinder described above, but any actuator (e.g., a solenoid) that drives the spindle vertically and can detect the drive current may be used.

[0059] In this embodiment, the control device 25 issues both a warning and stops the device when the peak value of the spindle vertical drive current is below a predetermined threshold. However, the present invention is not limited to this, and at least one of these actions may be performed.

[0060] The embodiments described above are illustrative for explaining the present invention and are not intended to limit the scope of the present invention to those embodiments only. Those skilled in the art can modify the invention as appropriate without departing from the spirit of the invention. [Explanation of Symbols]

[0061] 1. Drilling machine 10 Printed circuit boards 11 Equipment base 12 Machining Tables 13 Gantry column 15 Cross slide 16 spindles 17 Drill 17A Outer surface 18 Subchuck 19 Supply Toolpost 20 Discharge Toolposts 21 Drill Cassette 22 Drill Inspection Machine 25 Control device 26 Display section 27 Memory section 31 Rotor Shaft 31A First tapered surface 31B Buttock surface 32. Collet chuck (first holding part) 32A Second tapered surface 32B Slit 32C Inner surface 33 Springs 34 Guide bush 35 Piston Rod 36 Pressing mechanism 41 Spindle vertical drive control unit 42 Spindle control unit 43 XY Direction Drive Control Unit 44 Judgment section 45. Spindle vertical drive mechanism 46 XY Direction Drive Mechanism 47 Position detection sensor 51 sleeves 52 Holder 53 springs 57c mating hole

Claims

1. A spindle comprising a first holding portion for holding a drill, and the drill held in the first holding portion for rotating the drill, A tool post having a second holding portion located coaxially with the spindle and which temporarily holds the drill when replacing the drill held by the first holding portion, A drilling apparatus comprising a drive mechanism that allows the spindle to move along the axial direction of the spindle between a holding position in which the first holding portion can hold the drill temporarily held in the second holding portion and a separation position away from the holding position, In the process of moving the spindle from the holding position to the separated position by the drive mechanism, while the drill temporarily held in the second holding part is held in the first holding part, a detection means for detecting the drive current that drives the drive mechanism is provided. A drilling apparatus characterized by comprising: a determination means for determining the holding force of the tool post based on the drive current detected by the detection means.

2. In the drilling apparatus according to claim 1, The drilling apparatus is characterized in that the determination means issues a warning and stops the device if the peak value of the drive current is less than or equal to a predetermined threshold.

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