JP2013146651A - Method for removing foreign matter inside hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technology for removing foreign matter inside a hole, allowing certain discharge of the foreign matter present inside the hole outside the hole with small man-hours.SOLUTION: Foreign matter removal is executed in a process of inserting a nozzle 20 into a hole 25 in (b), and jetting air to the bottom 26 of the hole 25 from the nozzle 20; and a process of moving the nozzle 20 outside the hole 25 while jetting air in (d). When moving the nozzle 20 outside the hole 25 in a state that the air becomes easy to flow out from inside the hole 25, foreign matter 27 present inside the hole 25 can be carried outside the hole 25 by the air, and the foreign matter 27 is certainly discharged outside the hole 25. A fluid is jetted from the nozzle 20 inside the hole 25, and the nozzle 20 is only moved outside the hole 25 as it is, so that the foreign matter 27 present inside the hole 25 can be certainly discharged outside the hole 25 with small man-hours.

Description

  The present invention relates to a technique for removing foreign matter in a hole.

  When a bottomed hole is drilled in the workpiece, foreign matter such as chips remains in the hole. Various devices for discharging the foreign matter out of the hole have been proposed (see, for example, Patent Document 1 (FIG. 3)).

Patent document 1 is demonstrated based on the following figure.
FIG. 5 is a diagram for explaining the basic principle of the prior art. By inserting the fluid ejection nozzle 101 of the air blowing device 100 into the bottomed hole 102 and ejecting the air 103 from the fluid ejection nozzle 101, the air 103 Chip 104 is discharged out of the hole.

By the way, even if air blow is applied to the bottomed hole 102, chips may remain in the hole. Next, the movement of the remaining chips will be described.
FIG. 6 is a diagram for explaining the movement of chips in a conventional hole. As shown in FIG. 6A, a rounded chip 105 is left at the bottom of the bottomed hole 102.

When air is ejected from the fluid ejection nozzle 101 as indicated by the arrow (1), the chips 105 rounded up by the air flow rise.
Small chips are discharged out of the hole, but large chips remain in the hole, and the chips 105 are entangled to form a lump 106 as shown in FIG.
By continuing the ejection of air from the fluid ejection nozzle 101 as indicated by the arrow (2), the lump 106 is carried out of the hole by the fluid.

  However, if the chip lump 106 is large, the chip lump 106 fits into the fluid ejection nozzle 101 and the wall 107 of the bottomed hole 102 as shown in FIG. Work man-hours increase.

  Therefore, it is required that foreign matter in the hole can be reliably discharged out of the hole with a small number of man-hours.

JP 2002-96034 A

  An object of the present invention is to provide a technique for removing foreign matter in a hole that can reliably discharge foreign matter in the hole to the outside of the hole with a small number of man-hours.

  The invention according to claim 1 is a foreign matter removal method for removing foreign matter from a hole with a bottom, wherein a fluid ejection nozzle is inserted into the hole, and fluid is passed from the fluid ejection nozzle toward the bottom of the hole. It is characterized by comprising a fluid ejecting step of ejecting and a nozzle moving step of moving the fluid ejecting nozzle out of the hole while ejecting the fluid.

  In the invention according to claim 2, when the tip of the fluid ejection nozzle is brought close to the bottom of the hole in the fluid ejection step, and the fluid ejection nozzle is moved out of the hole in the nozzle movement step, The distance from the tip of the fluid ejection nozzle is greater than the gap between the hole wall and the fluid ejection nozzle.

  The invention according to claim 3 is characterized in that the fluid ejection step and the nozzle movement step are repeated a predetermined number of times in order.

  In the invention according to claim 1, in the fluid ejection step, the fluid ejection nozzle is inserted into the hole, the fluid is ejected from the fluid ejection nozzle to the bottom of the hole, and the fluid is ejected from the fluid ejection nozzle in the nozzle movement step. The fluid ejection nozzle is moved from the inside of the hole to the outside of the hole.

  The fluid ejected to the bottom of the hole once strikes the bottom and changes its direction to flow out of the hole. That is, the fluid easily flows from the inside of the hole to the outside of the hole. If the fluid ejection nozzle is moved from the inside of the hole to the outside of the hole while maintaining the flow of the fluid, the foreign matter in the hole can be carried out of the hole by the fluid, and the foreign matter is reliably discharged out of the hole. Since the fluid is ejected from the fluid ejection nozzle inserted into the hole and the fluid ejection nozzle is simply moved out of the hole while the fluid is ejected, the foreign matter in the hole can be reliably discharged out of the hole with a small number of man-hours. Can do.

In the invention which concerns on Claim 2, the front-end | tip of a fluid ejection nozzle is brought close to the bottom of a hole at a fluid ejection process.
The fluid ejected to the bottom of the hole immediately hits the bottom and flows out of the hole. Since it becomes easier for the fluid to flow from the inside of the hole to the outside of the hole, the foreign matter in the hole can be more reliably discharged out of the hole.

In addition, when the fluid ejection nozzle is moved out of the hole in the nozzle moving step, the distance between the hole opening and the tip of the fluid ejection nozzle is larger than the gap between the hole wall and the fluid ejection nozzle. did.
If the foreign matter in the hole is large, the foreign matter is pushed by the fluid and enters the gap between the hole wall and the fluid ejection nozzle. In the present invention, when the fluid ejection nozzle is moved out of the hole, the distance between the opening of the hole and the tip of the fluid ejection nozzle is larger than the gap between the hole wall and the fluid ejection nozzle. Can be smoothly discharged out of the hole.

In the invention according to claim 3, the fluid ejection process and the nozzle movement process are repeated a predetermined number of times in order.
By repeating the fluid ejection process and the nozzle movement process a predetermined number of times in order, even if a foreign object remains in the hole in the first foreign object removal operation, the foreign object can be discharged out of the hole in the next foreign object removal operation.

It is a general view of the foreign material removal apparatus which enforces the foreign material removal method in the hole which concerns on this invention. It is a figure explaining a fluid ejection process. It is a figure explaining a nozzle movement process. It is a flowchart of the foreign material removal method in a hole. It is a figure explaining the basic principle of the prior art. It is a figure explaining the movement of the chip within the conventional hole.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

A method for removing foreign matter in a hole according to the present invention will be described with reference to the drawings.
First, the configuration of a foreign matter removing apparatus that performs the foreign matter removing method in the hole will be described with reference to FIG.
As shown in FIG. 1, the foreign matter removing apparatus 10 includes a support member 12 provided at the tip of a robot arm 11 for supporting each component, a cylinder 13 supported by the support member 12, and a piston rod 14 of the cylinder 13. And a fluid ejection nozzle 20 that extends in the axial direction of the piston rod 14 and ejects air, and is supported by the support member 12 and connected to the inside of the fluid ejection nozzle 20 via a hose 21 and the fluid ejection nozzle 20. A compressor 22 for sending air into the interior of the compressor, and a control unit 23 that is supported by the support member 12 and controls the cylinder 13 and the compressor 22.

  A workpiece to be removed by the foreign matter removing apparatus 10 is a mold 24. A small-diameter hole 25 used for component mounting and positioning is opened in the mold 24 by a drill. At that time, chips 27 as foreign matters often remain on the bottom 26 of the small-diameter hole 25. Therefore, the fluid ejection nozzle 20 is pushed out by driving the cylinder 13, and the fluid ejection nozzle 20 is inserted into the small diameter hole 25. Next, the compressor 22 is activated to supply air from the fluid ejection nozzle 20 to the bottom 26 of the small diameter hole 25. That is, the chip 27 is removed from the small-diameter hole 25 having the bottom 26 by air blowing the small-diameter hole 25.

  In the embodiment, the mold 24 is applied to the target workpiece, but a pump casing or a cylinder block of an engine in which a small-diameter hole is formed by a drill is also applicable, and general mechanical parts may be applied.

A method for removing foreign matter in a hole performed using the foreign matter removing apparatus 10 will be described below.
First, the fluid ejection process will be described with reference to FIG.
As shown in FIG. 2A, by driving the cylinder 13, the fluid ejection nozzle 20 is pushed out toward the small-diameter hole 25 as indicated by an arrow (3).

  As shown in (b), the fluid ejection nozzle 20 is inserted into the small diameter hole 25, and the compressor 22 is started with the tip 28 of the fluid ejection nozzle 20 being close to the bottom 26 of the small diameter hole 25. Air is sent from the compressor 22 to the fluid ejection nozzle 20 as indicated by an arrow (4), and this air is ejected from the opening 29 of the fluid ejection nozzle 20 as indicated by an arrow (5).

As shown in (c), air flows toward the bottom 26 of the small-diameter hole 25 as shown by the arrow (6).
The air once hits the bottom 26 and changes its direction as shown in (d) to flow out of the small-diameter hole 25 as shown by an arrow (7). It becomes easy to flow out. Therefore, the small chips 27 are carried out of the small diameter hole 25 by air.

On the other hand, the large chip 31 is pushed by air as indicated by the arrow (8), but enters between the outer surface 32 of the fluid ejection nozzle 20 and the wall 33 of the small diameter hole 25.
Next, the fluid ejection nozzle 20 is moved as shown by the arrow (9) while ejecting air.

A nozzle movement process is demonstrated based on FIG.
As shown in FIG. 3A, the fluid ejection nozzle 20 was moved to the vicinity of the opening 34 of the small diameter hole 25. Large chips 31 remain between the outer surface 32 of the fluid ejection nozzle 20 and the wall 33 of the small diameter hole 25. While ejecting air, the fluid ejection nozzle 20 is further moved as shown by the arrow (10).

As shown in (b), the fluid ejection nozzle 20 was moved out of the small diameter hole 25. At this time,
A distance H1 between the opening 34 of the small diameter hole 25 and the tip 28 of the fluid ejection nozzle 20 is larger than the gap L1 between the wall 33 of the small diameter hole 25 and the outer surface 32 of the fluid ejection nozzle 20. Accordingly, the large chip 31 and the plurality of small chips 27 are discharged out of the small diameter hole 25.

As shown in (c), air is continuously ejected from the opening 29 of the fluid ejection nozzle 20, and the large chip 31 and the plurality of small chips 27 are separated from the small diameter hole 25 by the air.
There is a case where chips remain in the small-diameter hole 25. At that time, the fluid ejection step shown in FIG. 2 and the nozzle movement step shown in FIG. 3 are repeated a predetermined number of times in order.

Next, the procedure of the foreign matter removal method in the hole will be described in detail with reference to FIG.
As shown in FIG. 4, in step (hereinafter referred to as ST) 01, the nozzle is moved upward. Specifically, in FIG. 1, the fluid ejection nozzle 20 is moved above the small-diameter hole 25 of the mold 24 by the robot arm 11.

  In ST02, it is confirmed whether or not the nozzle is in the initial position. If YES, the process proceeds to ST04, and if NO, the process proceeds to ST03. Specifically, in FIG. 1, a YES determination is made when the piston retracted position is detected by the stroke sensor 37 provided in the cylinder 13, and a NO determination is made when it cannot be detected.

  In ST03, the nozzle is retracted to the initial position. Specifically, in FIG. 1, the piston of the cylinder 13 is retracted based on a command from the control unit 23.

  In ST04, the nozzle is advanced. Specifically, in FIG. 2A, the cylinder 13 is driven to push the fluid ejection nozzle 20 toward the small diameter hole 25 as indicated by the arrow (3).

  In ST05, the supply of air is started. Specifically, in FIG. 2B, the compressor 22 is started in a state where the fluid ejection nozzle 20 is inserted into the small diameter hole 25 and the tip 28 of the fluid ejection nozzle 20 is brought close to the bottom 26 of the small diameter hole 25. To do. Air is sent from the compressor 22 to the fluid ejection nozzle 20 as indicated by an arrow (4), and this air is ejected from the opening 29 of the fluid ejection nozzle 20 as indicated by an arrow (5).

  In ST06, it is confirmed whether or not the count time Time1 is equal to or longer than the predetermined time Tstd1. If YES, the process proceeds to ST07, and if NO, the process returns to the beginning of ST06. Specifically, in FIG. 1, counting is performed by a timer built in the control unit 23. The predetermined time Tstd1 is a time for further strengthening the air flow from the inside of the hole to the outside of the hole.

  In ST07, the nozzle is moved backward. Specifically, in FIG. 2B, the fluid ejection nozzle 20 is returned to the initial position by driving the cylinder 13.

  In ST08, the supply of air is stopped. Specifically, in FIG. 1, the compressor 22 is stopped by a command from the control unit 23.

  In ST09, it is confirmed whether or not foreign matter remains in the hole. If YES, the process proceeds to ST01, and if NO, the process is ended. Specifically, in FIG. 1, by operating the robot arm 11, the bottom 26 of the small diameter hole 25 is imaged by the camera 38 attached to the support member 12, and the presence or absence of the chips 27 is confirmed. In the embodiment, the configuration is such that the presence or absence of the foreign matter 27 is confirmed by the camera 38, and the foreign matter removal operation is repeated if the foreign matter 27 is confirmed. You may do it.

The effects of the foreign matter removal method in the hole described above will be described below.
As shown in FIG. 2 (d), the fluid ejected to the bottom 26 of the hole 25 once strikes the bottom 26 and changes its direction to flow out of the hole 25. That is, the fluid easily flows from the inside of the hole 25 to the outside of the hole 25. When the fluid flow is maintained and the fluid ejection nozzle 20 is moved from the hole 25 to the outside of the hole 25 as shown in FIG. 3B, the foreign matter 27 in the hole 25 is fluidized with the hole 25. The foreign matter 27 is reliably discharged out of the hole 25.

  Since the fluid is ejected from the fluid ejection nozzle 20 inserted into the hole 25 and the fluid ejection nozzle 20 is merely moved out of the hole 25 while the fluid is ejected, the foreign matter 27 in the hole 25 is It can be reliably discharged out of the hole with fewer man-hours.

  As shown in FIG. 2D, the fluid ejected to the bottom 26 of the hole 25 immediately hits the bottom 26 and flows out of the hole 25. Since it becomes easier for the fluid to flow from the inside of the hole 25 to the outside of the hole 25, the foreign matter 27 in the hole 25 can be more reliably discharged out of the hole 25.

  As shown in FIG. 2 (d), when the foreign matter 31 in the hole 25 is large, the foreign matter 31 is pushed by the fluid and enters the gap between the wall 33 of the hole 25 and the fluid ejection nozzle 30. In the present invention, as shown in FIG. 3B, when the fluid ejection nozzle 20 is moved out of the hole 25, the distance H <b> 1 between the opening 34 of the hole 25 and the tip 28 of the fluid ejection nozzle 20 is the hole 25. Since the gap 33 is larger than the gap L <b> 1 between the wall 33 and the fluid ejection nozzle 20, the large foreign matter 31 can be smoothly discharged out of the hole 25.

  By repeating the fluid ejection step shown in FIG. 2 and the nozzle movement step shown in FIG. 3 in order a predetermined number of times, even if the foreign matter 27 remains in the hole 25 in the first foreign matter removal operation, the next foreign matter The foreign matter 27 can be discharged out of the hole 25 by the removing operation.

In the embodiment, as shown in FIG. 1, the fluid ejection nozzle 20 is moved by the robot arm 11 and the cylinder 13. However, the present invention is not limited to this, and the fluid ejection nozzle 20 is applied to an NC machine that processes the mold 24. May be attached.
Further, when the NC machine is configured to supply cooling air to the processing blade, the air may be used as a fluid for removing foreign matter. If the machining blade is replaced with a fluid ejection nozzle and the drive program is changed, there is no need to separately provide a drive device for moving the fluid ejection nozzle, and the foreign matter removing apparatus can be configured at low cost.

  The fluid according to the present invention has been described by applying air in the embodiment, but nitrogen or an inert gas (such as argon) may be applied.

  The method for removing foreign matter in a hole of the present invention is suitable for an operation of removing chips remaining in a small-diameter hole after processing.

  DESCRIPTION OF SYMBOLS 10 ... Foreign substance removal apparatus, 20 ... Fluid ejection nozzle, 25 ... Hole (small diameter hole), 26 ... Bottom, 27, 31 ... Chip, 28 ... Tip, 33 ... Wall, 34 ... Opening, H1 ... Distance, L1 ... Gap .

Claims (3)

A foreign matter removing method for removing foreign matter from a hole with a bottom,
A fluid ejection step of inserting a fluid ejection nozzle into the hole and ejecting fluid from the fluid ejection nozzle toward the bottom of the hole;
A foreign substance removal method in a hole, comprising: a nozzle moving step of moving the fluid ejection nozzle from the inside of the hole to the outside of the hole while ejecting the fluid. In the fluid ejection step, the tip of the fluid ejection nozzle is brought close to the bottom of the hole,
When the fluid ejection nozzle is moved out of the hole in the nozzle moving step, the distance between the opening of the hole and the tip of the fluid ejection nozzle is greater than the gap between the hole wall and the fluid ejection nozzle. 2. The method for removing foreign matter in a hole according to claim 1, wherein the foreign matter is enlarged.   The foreign matter removal method in a hole according to claim 1 or 2, wherein the fluid ejection step and the nozzle movement step are sequentially repeated a predetermined number of times.

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