JP2011056603A - Method and device for machining deep hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for machining a deep hole which prevent wear and damage of a cutting blade during penetration in deep hole machining. <P>SOLUTION: The method is for machining a deep hole 2B at the workpiece W by using a machining device to which a gun drill tool 20 is attached to a spindle. For the gun drill tool 20 when the machining deep hole 2B is not penetrated, the machining state of the gun drill tool 20 is set to a normal mode. For the gun drill tool 20 when the machining deep hole 2B is penetrated, the machining state of the gun drill tool 20 is set to a protective mode of which the machining load is lower than the normal mode. More efficient deep hole machining in the normal mode is executed until the penetrating position, and the mode is switched to the protective mode upon penetrating, thus protecting the gun drill tool 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a deep hole processing method and a deep hole processing apparatus that perform deep hole processing on a workpiece using a gun drill tool.

Conventionally, a mold for synthetic resin molding or the like has a passage for passing a temperature adjusting fluid inside the mold in order to maintain the mold temperature according to the molding process (temperature control fluid flow path). Is formed. In particular, in a mold used for molding a large-sized injection molded product such as an automobile part, the temperature control fluid flow path is also formed long to a deep part of the mold.
In order to machine such a deep and long hole (deep hole), an apparatus in which a gun drill tool for deep hole machining is mounted on the spindle of a machine tool is used. In this apparatus, a workpiece to be a mold is fixed to a table, a gun drill tool is moved to a machining position of the workpiece, a main shaft is rotated, and a gun drill tool is sent to the workpiece to drill a deep hole.
At this time, in the gun drill tool, the workpiece is cut by the cutting blade formed at the tip, and high-pressure cutting oil is supplied to the tip of the gun drill tool through the cutting oil passage extending from the inside of the spindle to the tip of the gun drill tool. The tip of the gun drill is cooled and lubricated, and the chips of the cut workpiece are discharged out of the workpiece by the flow of cutting oil (Patent Document 1).

Gun drill tools used for deep hole machining include a screwdriver attached to the spindle of a machine tool, a long pipe-shaped shank with a rear end fixed to the screwdriver, and an ultra-brazed joint that is brazed to the tip of the shank. A structure having a chip made of hard alloy is widely used (Patent Document 2).
The tip of the tip is formed in a chevron shape with the apex point disposed at a position displaced from the tool axis as the forefront, and an outer cutting edge is formed on the outer peripheral side, and an inner cutting edge is formed on the center side.
The inside of the shank is a cutting oil flow path, the rear end side is supplied with high-pressure cutting oil from the machine tool through the inside of the driver, and the tip end side is from an opening formed in the tip end surface of the tip of the gun drill tool. High-pressure cutting oil is supplied to the tip portion of the deep hole which is opened to the outside and cutting is proceeding at the tip tip.
A V-groove in the drilling direction is formed on the outer periphery of the shank. This V-groove reaches the tip end through a similar V-groove on the outer periphery of the tip, and the cutting oil supplied to the tip of the deep hole is at the tip end. While entraining the generated cutting waste, the V-groove flows toward the driver side and is discharged out of the deep hole.

JP 2008-213064 A JP-A-9-141510

By the way, the high-pressure cutting oil supplied to the gun drill tool is sprayed from the tip of the tip through the inside of the gun drill tool, but since the tip of the deep hole being processed is in a closed state, the hand going here is blocked and the periphery of the tip is blocked. Is discharged to the outside through the V-groove.
Here, if the tip of the deep hole penetrates to the opposite side of the workpiece, or penetrates into another intersecting deep hole, the deep hole tip that was in the closed state is opened, and the cutting oil sprayed from the tip tip It leaks into the other deep hole on the opposite side of the workpiece or intersects, and the flow returning to the V groove is lost.
If leakage of the cutting oil during such penetration occurs, lubrication or cooling of the chip cutting edge becomes insufficient, and there is a possibility of inducing wear and damage of the chip cutting edge.

  An object of the present invention is to provide a deep hole machining method and a deep hole machining apparatus capable of avoiding wear and damage of a cutting blade during penetration of deep hole machining.

  The deep hole machining method of the present invention is a deep hole machining method for machining a deep hole in a workpiece using a machining apparatus having a gun drill tool mounted on a spindle, and the deep hole being machined by the gun drill tool is in a state where the deep hole is not penetrated. Then, the processing state of the gun drill tool is set to the normal mode, and when the deep hole being processed by the gun drill tool penetrates, the processing state of the gun drill tool is set to the protection mode in which the processing load is lighter than the normal mode. It is characterized by switching.

In the present invention, the determination as to whether the deep hole is not penetrated or penetrated is made using design information (thickness in the deep hole direction from the machining side surface to the opposite surface of the workpiece) given to the machining apparatus in advance. Based on the specifications of the gun drill tool (the length to the tip of the gun drill tool), it is possible to determine the feed amount of the gun drill tool in the deep hole machining direction leading to the penetration state. For example, when a deep hole is machined into a 900 mm thick workpiece with a 700 mm gun drill tool, it can be determined that the tip of the gun drill penetrates the opposite surface of the workpiece when 900-700 = 200 mm.
As the normal mode, a processing state with the maximum processing efficiency for the workpiece may be selected based on the specifications of the processing apparatus to be used and the gun drill tool.

  As a protection mode, a part of the machining conditions is reduced so that the processing load of the gun drill tool is reduced to the extent that damage to the gun drill tool and inconvenience on the workpiece machining site (around the penetrating part) do not occur compared to the normal mode described above. The machining state with changed can be adopted. For example, the number of rotations of the gun drill tool can be reduced with respect to the normal mode described above, and the feed speed of the gun drill tool can be reduced. In addition, by reducing the supply pressure of the cutting oil supplied to the gun drill tool or reducing the flow speed of the cutting oil, it is possible to increase the cutting oil that stays in the penetrating part, which also reduces the processing load on the gun drill tool. Can be planned. Alternatively, a combination of these condition changes may be used.

According to the present invention as described above, when the gun drill tool penetrates to the opposite side of the workpiece or the hollow portion in the workpiece, the machining state of the gun drill tool can be switched from the normal mode to the protection mode, and the penetration portion is usually It is possible to protect the gun drill tool by switching to the protection mode at the time of penetration while performing efficient deep hole machining by the mode.
In addition, when the gun drill tool penetrates to the hollow part in the workpiece and switches to the protection mode, the tip of the gun drill tool reaches the wall surface on the opposite side of the hollow part by feeding the gun drill tool further. In this state, by returning the processing state of the gun drill tool to the normal mode, continuous deep holes can be formed on the same axis. After that, when the gun drill tool penetrates again to the opposite side of the workpiece or to the hollow portion in the workpiece, the switching to the similar protection mode is performed.

In the present invention, in the protection mode, it is desirable to reduce the rotational speed of the gun drill tool relative to the normal mode.
In the present invention, the processing load of the gun drill tool is reduced by reducing the rotation speed of the gun drill tool, and the load can be reduced most effectively as a protection mode.
In the protection mode, in addition to lowering the rotational speed of the gun drill tool, lowering the feed speed of the gun drill tool, lowering the supply pressure of the cutting oil supplied to the gun drill tool, and the flow speed of the cutting oil Any of lowering may be used in combination.

In the present invention, a command for instructing deep hole machining is given to the machining apparatus to execute the deep hole machining for the workpiece, and the command specifies a depth position at which the deep hole penetrates. It is desirable that a position and a clearance amount for designating a switching position for switching from the normal mode to the protection mode as a position shallower than the penetrating position are set.
Here, when the penetrating position is on the opposite side of the workpiece, the switching position only needs to be shallower than the penetrating position, but when the penetrating position such as other intersecting deep holes is a hollow part of the workpiece, It is desirable to provide room for the clearance amount on each of the near side and the far side of the penetration position.
In the present invention, the switching position and the through position can be specified by a command for instructing deep hole machining, and the switching position can be specified relative to the through position by the clearance amount. This clearance amount may be set according to the type of gun drill tool, and even if the penetration position changes depending on the workpiece, the switching position can be automatically changed by changing only the penetration position.

  The deep hole machining apparatus of the present invention includes a table on which a workpiece is placed, a spindle that moves relative to the table, a gun drill tool that is mounted on the spindle and drills a deep hole in the workpiece, the spindle, and the spindle Control means for controlling each part including a table, and the control means sets the machining state of the gun drill tool to a normal mode when the deep hole being machined by the gun drill tool is not penetrated. When the deep hole being machined by the gun drill tool penetrates, the machining state of the gun drill tool is switched to a protection mode in which the machining load is lighter than the normal mode.

  In the present invention as described above, it is possible to obtain the same effects as the deep hole machining method of the present invention described above.

The front view which shows one Embodiment of the deep hole processing apparatus of this invention. Sectional drawing which shows the workpiece | work of the said embodiment. The block diagram which shows the control means of the deep hole processing apparatus of the said embodiment. The figure for demonstrating the content of the deep hole machining program of the said workpiece | work. The flowchart which shows the procedure of the said deep hole processing. The figure which shows the modification of the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a deep hole machining apparatus 9 forms the temperature control fluid flow path 1 in the workpiece W shown in FIG. 2 by performing deep hole machining using a gun drill tool based on the present invention.

In FIG. 2, a workpiece W is a mold having a cavity (not shown) formed on the surface, and a temperature-controlled fluid flow path 1 for circulating a temperature-adjusted fluid (temperature-controlled fluid) is formed inside.
The temperature control fluid channel 1 is formed by a plurality of deep holes 2A and 2B that are formed in the workpiece W and intersect vertically and horizontally. The vertical deep hole 2A is drilled from the lower surface side of the workpiece W in the drawing, and the tip does not reach the opposite side of the workpiece W, that is, the surface on the upper surface side in the drawing. The deep holes 2B in the lateral direction communicate with each other at the intersections with the deep holes 2A, and the deep hole 2B on the upper side in the figure is drilled from the right side surface in the drawing to the left side surface in the drawing, that is, the hole. It penetrates from side to side.
A female screw 3 is machined at the necessary end portions of the deep holes 2A and 2B, and a plug member 4 is screwed into the female screw 3. Thereby, the temperature control fluid channel 1 for circulating the temperature control fluid is formed inside the mold.

  Returning to FIG. 1, the deep hole machining apparatus 9 includes a bed 11, a table 12 provided on the upper surface of the bed 11 so as to be movable in the front-rear direction (X-axis direction), and a work W placed thereon, and the bed 11. A saddle 13 movably provided in the left-right direction (Z-axis direction) on the other side of the upper surface, a column 14 erected on the upper surface of the saddle 13, and a vertical direction (Y-axis direction) along the column 14 A spindle head 15 that can be moved up and down, a spindle 17 that can be rotated by the spindle head 15 and rotated by a spindle motor 16, and a gun drill tool 20 that is mounted on the spindle 17 and performs deep hole machining on a workpiece W. And an automatic tool changer 21.

A cutting oil passage 17A is formed through the main shaft 17 from the proximal end to the distal end along the internal axial direction. A cutting oil pump 24 that sends high-pressure cutting oil through a pipe 23 is connected to the cutting oil passage 17A.
The automatic tool changer 21 stocks a plurality of gun drill tools 20 and taps (not shown), and changes any of the gun drill tools 20 or taps selected from the gun drill tools 20 or taps to the spindle 17.

The gun drill tool 20 is longer than a normal drill. For example, the gun drill tool 20 has a length of about 500 mm to 1000 mm, and a V-shaped groove for discharging chips is formed on the outer peripheral surface from the middle to the tip. A cutting oil passage 20A through which cutting oil passes is formed through the base end to the tip end.
Therefore, when the gun drill tool 20 is mounted on the main shaft 17, the high-pressure cutting oil pressurized by the cutting oil pump 24 passes through the main shaft 17 and the cutting oil flow paths 17 </ b> A and 20 </ b> A of the gun drill tool 20. It comes to be supplied from.

The deep hole machining apparatus 9 has a tool length measuring device 22 for measuring the length of the gun drill tool 20.
The tool length measuring device 22 is used to measure the tip position of the gun drill tool 20 to which the main shaft 17 is attached. If the tip position of the gun drill tool 20 is known, the tip position of the gun drill tool 20, that is, the tip depth of the deep hole being processed can be determined from the position of the main shaft 17.
Specifically, the tool length measuring device 22 includes a detection unit 22A with which the tip of the gun drill tool 20 comes into contact, and generates a contact signal when the tip of the gun drill tool 20 comes into contact with the detection unit 22A. In response to this, the NC device 31 to be described later obtains a Z-axis coordinate value of the saddle 13 or the spindle 17, and the length (measurement length) of the gun drill tool 20 relative to the reference position of the spindle 17 based on the Z-axis coordinate value. Can be calculated.

The deep hole machining device 9 has an NC device 31 as a control means.
In FIG. 3, the NC device 31 is connected to a drive mechanism or the like for operating the components of the deep hole machining device 9, and these are linked to operate under the control of the NC device 31, thereby deep hole machining device. Let 9 execute the desired machining.
Specifically, the NC device 31 includes an X-axis drive mechanism 32 that moves the table 12 in the X-axis direction, a Y-axis drive mechanism 33 that moves the spindle head 15 in the Y-axis direction, and a saddle 13 that moves in the Z-axis direction. In addition to the Z-axis drive mechanism 34, the drive circuit 35 for driving the spindle motor 16, the automatic tool changer 21, the tool length measuring device 22 as the tool length measuring means, and the cutting oil pump 24, the input device 41 and the output means A display 42, a printer 43, a program memory 44, a work memory 45, and the like are connected.

Here, an X-axis drive mechanism 32 that moves the table 12 in the X-axis direction, a Y-axis drive mechanism 33 that moves the spindle head 15 in the Y-axis direction, and a Z-axis drive mechanism 34 that moves the saddle 13 in the Z-axis direction. Thus, a relative moving means for relatively moving the table 12 and the main shaft 17 in the three-dimensional direction is configured. The X-axis drive mechanism 32, the Y-axis drive mechanism 33, and the Z-axis drive mechanism 34 are constituted by a feed screw mechanism, but may be a linear motor mechanism or the like.
The program memory 44 stores various machining programs for machining the temperature control fluid flow path 1 in the workpiece W shown in FIG. A machining program for executing deep hole machining is specified using a G code frequently used in existing NC apparatuses.
The work memory 45 is provided with a work area used when the machining program is executed.

The NC device 31 controls the spindle 17 (spindle motor 16), relative movement means (X-axis drive mechanism 32, Y-axis drive mechanism 33, Z-axis drive mechanism 34), etc., based on the sequentially designated processing program. Deep hole machining is performed on the workpiece W.
At this time, the NC device 31 sets the processing state of the gun drill tool 20 to the normal mode when the deep hole being processed by the gun drill tool 20 is not penetrated, and penetrates the deep hole being processed by the gun drill tool 20. In this state, control is performed to switch the processing state of the gun drill tool 20 to a protection mode in which the processing load of the gun drill tool 20 is lighter than in the normal mode.

FIG. 4 shows the details of the deep hole machining according to the present invention.
In FIG. 4, a plurality of vertical deep holes 2 </ b> A are processed in the workpiece W, and a horizontal deep hole 2 </ b> B that intersects these and penetrates to the opposite side is processed.
The deep hole machining program for machining the deep hole 2B is described as a G code command having the following format, for example.
G555 X_Y_Z_R_A_B_C_Q_F_ [V1 = _, V2 = _, V3 = _, V4 = _, ...]
Each parameter in the G555 command is as follows.
X: X coordinate value of the deep hole center axis Y: Y coordinate value of the deep hole center axis Z: Final Z coordinate value of the deep hole R: Rapid feed approach point A: Approach point (put the gun drill tool into the guide hole with rotation stopped) depth)
B: Z coordinate value of the opposite surface of the workpiece C: Clearance amount (designation of the range for switching to protection mode)
Q: Distance from the tip of the gun drill tool to the shoulder F: Feed rate V1, V3, ... Z coordinate value of the center axis of the intersecting hole V2, V4, ... Z coordinate value of the diameter of the intersecting hole

The normal mode and the protection mode in such deep hole machining are set as follows, for example.
Normal mode: The rotation speed S and the feed speed F are designated.
Protection mode: The number of revolutions S is suppressed to 80% of the number of revolutions in the standard mode.
Feed speed F is suppressed to 50% of the standard mode feed speed.
The switching between the normal mode and the protection mode is executed in accordance with the result of determining the penetration state of the gun drill tool 20 based on the parameters specified in the G555 command described above.
The penetrating state of the gun drill tool 20 includes a case where it passes through the intersecting hole (deep hole 2A) and a case where it passes through to the opposite side of the workpiece W.

The mode is switched as described below when the holes have passed through the intersecting holes.
In FIG. 4, if the processing of the deep hole 2B of the workpiece W by the gun drill tool 20 is performed from the right side in the figure, the gun drill tool 20 moves forward while processing the deep hole 2B in the normal mode, and first the depth at the Z coordinate V1 is reached. Crosses hole 2A. In the deep hole 2A, the central axis is the Z coordinate V1 and the diameter V2 from the parameters of the G555 command described above.
From this, the tip of the gun drill tool 20 enters the deep hole 2A at the Z coordinate (V1-V2 / 2), and the deep hole 2B being processed is in a penetrating state with respect to the deep hole 2A. When the gun drill tool 20 further advances, the tip thereof reaches the inner wall on the opposite side of the deep hole 2A at the Z coordinate (V1 + V2 / 2), and the workpiece W is cut again from here. Accordingly, the deep hole 2B being processed is in a penetrating state and the tip of the gun drill tool 20 is exposed in the deep hole 2A from the Z coordinate (V1-V2 / 2) to the Z coordinate (V1 + V2 / 2). The section (the section width is the diameter V2 of the deep hole 2A).

In the G555 command described above, a clearance amount C that designates a range in which switching to the protection mode is executed is set.
In the present embodiment, an area (from the Z coordinate (V1−V2 / 2 / C) to the Z coordinate (V1 + V2 / 2 + C)) expanded by the clearance amount C before and after the section of the deep hole 2A described above. A penetration region is set, and when the tip of the gun drill tool 20 is in the penetration region, the mode is switched to the protection mode, and when it goes out of the penetration region, the normal mode is restored.
The above is the application of the protection mode to the deep hole 2A at the Z coordinate V1, but the central axis position also differs for the other deep holes 2A (Z coordinates V3, V5, V7 positions) formed in the workpiece W. A similar process is performed.

When switching to the opposite side, mode switching is performed as follows.
In FIG. 4, it is assumed that processing of the deep hole 2 </ b> B of the workpiece W has progressed with the gun drill tool 20 and the tip thereof has approached the opposite side surface of the workpiece W.
In the aforementioned G555 command, the Z coordinate value B and the final Z coordinate value Z of the opposite surface of the workpiece W are set together with the clearance amount C described above.
In the present embodiment, a region expanded by a clearance amount C before the opposite surface of the workpiece W is defined as a penetration region, and the protection mode is switched when the tip of the gun drill tool 20 reaches this penetration region.
The machining of the gun drill tool 20 in the protection mode is continued until the tip of the gun drill tool 20 reaches the final Z coordinate value Z. When the gun drill tool 20 reaches the final Z coordinate value Z, the machining is finished and the gun drill tool is finished. The process which extracts 20 from the deep hole 2B is performed.

  The parameter processing procedure for the G555 command described above is stored in the program memory 44 described above, and is appropriately read out and executed by the NC device 31 in the same manner as the existing machining operation program.

The NC device 31 analyzes the machining program specified by the G555 command described above, the relative movement mechanism (the X-axis drive mechanism 32, the Y-axis drive mechanism 33 and the Z-axis drive mechanism 34) of the deep hole machining device 9, and the spindle motor. 16. Control the cutting oil pump 24 and the like to execute deep hole machining on the workpiece W using the gun drill tool 20.
For example, when processing the deep hole 2B penetrating the workpiece W described above, the following processing is executed.

FIG. 5 shows a procedure for machining the deep hole 2B in the workpiece W.
The NC device 31 moves the relative movement mechanism of the deep hole machining device 9 at a high speed, and moves the gun drill tool 20 mounted on the spindle 17 to the initial position with respect to the workpiece W. Specifically, based on the parameters of the G555 command described above, the rotation axis of the gun drill tool 20 is adjusted to the X and Y positions, and the tip of the gun drill tool 20 is advanced to the Z axis position R (step ST1).
Subsequently, the gun drill tool 20 is fed at a low speed, introduced into a prepared hole formed in advance in the workpiece W, and the tip of the gun drill tool 20 is advanced to the Z-axis position A (step ST2).

Next, the NC device 31 rotates the gun drill tool 20 to start processing the deep hole 2B in the workpiece W (step ST3). Here, the rotation of the gun drill tool 20 and the feed speed in the Z-axis direction are set to the normal mode.
The NC device 31 acquires the penetration region from the parameters of the G555 command described above, monitors the tip position of the gun drill tool 20 as the machining progresses, and determines whether the tip position of the gun drill tool 20 is in the penetration region described above. Are sequentially inspected (step ST4).
When the tip position of the gun drill tool 20 is out of the penetrating region, the NC device 31 selects the normal mode, and advances the processing of the workpiece W with the gun drill tool 20 as the rotation speed and feed speed in the normal mode (step ST5).
When the tip position of the gun drill tool 20 is in the penetrating region, the NC device 31 switches to the protection mode, and the gun drill tool 20 is lowered to the rotation speed and feed speed in the protection mode to proceed with processing (step ST6).
By repeating these steps, the deep hole 2B is processed in the workpiece W, and the gun drill tool 20 is switched to the protection mode in the four deep holes 2A and switched to the protection mode when penetrating to the opposite side of the workpiece W. It is done.

  The NC device 31 repeats the above-described machining operation until the tip of the gun drill tool 20 reaches the final Z coordinate value Z (step ST7), and when the tip of the gun drill tool 20 reaches the final Z coordinate value Z, The feed and rotation are stopped (step ST8). Thereafter, the NC device 31 retracts the gun drill tool 20 and pulls it out from the workpiece W, and finishes the deep hole machining.

  According to the present embodiment, when the gun drill tool 20 penetrates to the opposite side of the workpiece W or to a hollow portion such as the deep hole 2A in the workpiece W, the machining state of the gun drill tool 20 is changed from the normal mode to the protection mode. The gun drill tool 20 can be protected by switching to the protection mode during penetration while performing efficient deep hole machining in the normal mode up to the penetration site.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the embodiment, as the protection mode, the rotation speed S of the gun drill tool 20 is suppressed to 80% of the standard mode and the feed rate F is suppressed to 50% of the standard mode as compared with the normal mode. You may change suitably.

  In the above embodiment, the protection mode is set by suppressing both the rotational speed S and the feed speed F of the gun drill tool 20, but the feed speed F remains in the standard mode while suppressing the rotational speed S of the gun drill tool 20. It is good. Alternatively, the protection mode may be combined by lowering the supply pressure of the cutting oil and lowering the flow speed of the cutting oil, and there is no inconvenience in the damage of the gun drill tool 20 or the processing part of the workpiece W (around the penetrating part). It is sufficient if the processing load of the gun drill tool 20 can be reduced to a certain extent.

In the embodiment, the high-pressure cutting oil pressurized by the cutting oil pump 24 is supplied from the tip of the gun drill tool 20 through the main shaft 17 and the cutting oil passages 17A and 20A of the gun drill tool 20. However, it is not limited to this.
For example, as shown in FIG. 6, an oil filler block 18 connected to the cutting oil pump 24 is attached to the tip of the spindle head 15, and the cutting oil flow path of the gun drill tool 20 from the oil filler block 18 to the inside of the spindle head 15. A cutting oil passage 15A communicating with 20A may be formed, and the cutting oil from the cutting oil pump 24 may be supplied through these cutting oil passages 15A and 20A.

In the above embodiment, the table 12 is moved in the X-axis direction, the spindle head 15 is moved in the Y-axis direction, and the saddle 13 is moved in the Z-axis direction. However, relative movement means for relatively moving the table 12 and the spindle 17 is used. However, it is not limited to this. In short, any structure may be used as long as the table 12 and the spindle 17 can move relative to each other in the three-dimensional direction.
In the embodiment, the example in which the temperature control fluid flow path 1 of the workpiece W is processed has been described, but the present invention is not limited to this. Any workpiece may be used as long as a deep hole is machined into the workpiece W.

  The present invention is not limited to a mold, and can be used in general for methods and apparatuses that perform deep hole machining using a gun drill tool.

DESCRIPTION OF SYMBOLS 1 ... Temperature control fluid flow path 2A, 2B ... Deep hole 4 ... Plug member 9 ... Deep hole processing apparatus 11 ... Bed 12 ... Table 13 ... Saddle 14 ... Column 15 ... Spindle head 15A, 17A, 20A ... Cutting oil flow path 16 ... Spindle motor 17 ... Spindle 18 ... Oil filler block 20 ... Gun drill tool 21 ... Automatic tool changer 22 ... Tool length measuring device 22A ... Detector 23 ... Piping 24 ... Cutting oil pump 31 ... NC device (control means),
32 ... X-axis drive mechanism (relative movement means),
33 ... Y-axis drive mechanism (relative movement means),
34 ... Z-axis drive mechanism (relative movement means),
44 ... Program memory 45 ... Working memory W ... Work.

Claims (5)

A deep hole machining method for machining a deep hole in a workpiece using a machining apparatus having a gun drill tool mounted on a spindle,
In the state where the deep hole being machined with the gun drill tool is not penetrated, the machining state of the gun drill tool is set to the normal mode,
A deep hole machining method characterized in that, when a deep hole being machined by the gun drill tool penetrates, the machining state of the gun drill tool is switched to a protection mode in which the machining load is lighter than in the normal mode. The deep hole machining method according to claim 1,
In the protection mode, the deep hole machining method is characterized in that the number of rotations of the gun drill tool is reduced with respect to the normal mode. In the deep hole processing method according to claim 2,
In the protection mode, in addition to reducing the rotational speed of the gun drill tool, lowering the feed speed of the gun drill tool, lowering the supply pressure of the cutting oil supplied to the gun drill tool, and lowering the flow speed of the cutting oil A deep hole machining method characterized by using a combination of any of the above. In the deep hole processing method in any one of Claims 1-3,
A command for instructing deep hole machining is given to the machining device to execute deep hole machining for the workpiece, and the command includes a through position for designating a depth position at which the deep hole penetrates, and A deep hole drilling method characterized in that a clearance amount for designating a switching position for switching from the normal mode to the protection mode as a position shallower than the penetrating position is set. A table on which a workpiece is placed, a spindle that moves relative to the table, a gun drill tool that is mounted on the spindle and drills a deep hole in the workpiece, and a control unit that controls each part including the spindle and the table And comprising
The control means includes
In the state where the deep hole being machined with the gun drill tool is not penetrated, the machining state of the gun drill tool is set to the normal mode,
A deep hole machining apparatus, wherein when a deep hole being machined by the gun drill tool penetrates, the machining state of the gun drill tool is switched to a protection mode in which a machining load is lighter than the normal mode.

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