JPH08168908A - Cutting liquid feeder and method for deep boring - Google Patents

Abstract

PURPOSE: To perform boring with accuracy without a drill bending by arranging a tank to be supplied with cutting liquid, in opposition to the face to be bored deeply of a work, and making a drill pierce the insertion hole of this cutting liquid tank thereby boring the work. CONSTITUTION: A work 47 is fixed to a work mounting stage 2 by a clamp means 3, and a cutting liquid 6 is arranged opposite to the processing face 5. A drill 8 is rotated to pierce the through holes 20 and 19 by a drive means 11, thus boring with a depth L1 is made. This depth L1 is decided to get over the axial length of the drill of the chip discharge groove of the drill 8, and after boring, it is returned by a distance L2. Hereby, the chips within the chip discharge groove is let fall into the accommodation space 12 of the tank, and cutting liquid is penetrated into the through insertion hole 19 and the drill hole 59. Then, the drill 8 is advanced by a distance L2 to perform the boring by a length L3 (=L1), and the above operation is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel cutting fluid supply apparatus and method used for performing horizontal or vertical deep hole drilling on a workpiece made of metal or the like, and a cutting fluid supply apparatus for the same. The present invention relates to a deep hole drilling device that uses a drill to cut a hole.

[0002]

2. Description of the Related Art Conventional conventional drills for drilling deep holes have long cutting edges in the axial direction. In such a prior art, since the cutting edge is formed over a long distance, the strength is low and there is no means for supplying cutting fluid. Therefore, it is easy to be cut off, bends easily, causes seizure, has a short life, and has low hole drilling capability and accuracy. The maximum distance that chips generated during drilling of the drill can pass through the discharge groove is limited to 5 to 6 times the drill diameter. Therefore, a discharge groove that is too long in a deep hole drill lowers the rigidity of the drill and significantly reduces its working capacity.

Another prior art is a gun drill.
This gun drill has a configuration in which a large oil hole is required inside the drill to supply cutting fluid to the cutting edge and collect chips, and to supply a large amount of cutting fluid at high pressure. Since a high pressure cutting fluid is required to discharge the chips, the device for separating the cutting fluid from the chips is complicated and expensive, and is difficult to manage. Further, since this oil hole is formed inside the drill, there is a problem that rigidity is low and efficient machining cannot be performed.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to enable deep hole drilling to be performed with high precision and efficiency using a drill having high strength, and also to supply cutting fluid easily. To provide a cutting fluid supply device and method for deep hole machining.

[0005]

According to the present invention, there are formed through holes which are arranged so as to face a surface of a work to be deep-drilled, and through which a drill is inserted and guided and which have axis lines on a horizontal straight line. And a cutting fluid supply device for deep hole machining in which cutting fluid is supplied. Further, the present invention is characterized in that a storage space for storing chips is formed below the insertion hole. Further, the present invention is characterized in that at least a part of the wall facing the storage space can be opened and closed. The present invention also provides
(A) Arranged so as to face a surface of a workpiece to be deep-drilled, a drill is inserted and guided, and insertion holes each having an axis line on a horizontal straight line are formed, and cutting fluid is supplied to the inside. The first step of preparing a cutting fluid tank for deep hole machining, and (b) pushing the drill through the insertion hole and onto the work piece so that the chips can be driven in the chip discharge groove of the drill. Includes a second step of drilling less than the maximum length, and (c) a third step of returning the drill until the tip of the drill reaches the inside of the cutting fluid tank and discharging chips to the cutting fluid tank. (D) The deep hole drilling method is characterized in that the second and third steps are repeated until the hole to be cut is near the desired depth.
Further, the present invention is characterized in that the axial depth of the hole cut in the first second step is determined so as to exceed the length of the chip discharge groove of the drill in the drill axial direction. Further, according to the present invention, a work mounting base to which a work is detachably fixed and mounted, a rotation driving unit that drives the drill to rotate about the drill axis, and the work mounting base and the drill relative to each other, the axial direction of the drill. And a pair of insertion holes that are provided on the drill side of the work, facing the surface of the work to be deep-drilled, through which the drill is inserted and that have an axis on the axis of the drill. Are formed at intervals in the axial direction, cutting fluid is supplied to the inside, and the cutting fluid tank that can be opened and closed to discharge chips and the feeding means are controlled, and chips are discharged in the chip discharge groove of the drill. After drilling less than the maximum axial length of the drill that can escape, and including a control means that repeats the operation of returning the drill until the tip of the drill reaches the cutting fluid tank. Is a deep-hole drilling apparatus characterized. Further, the present invention is provided on a base, a fixing means for removably fixing a work to the base, a movable body provided on the base so as to be displaceable in a moving direction of approaching / separating from the work, and a movable body. ,
A rotation driving means for rotating the drill around the drill axis, a feed driving means for reciprocating the moving body in the moving direction, a drill side of the work, facing the surface of the work to be deep-drilled. A pair of insertion holes, which are provided to guide the drill through and have an axis on the axis of the drill, are formed at intervals in the axial direction, cutting fluid is supplied inside, and it is possible to displace in the moving direction. Is provided in
Cutting fluid tank with a chip discharge hole formed in the lower part, a spring that gives the cutting fluid tank a spring force toward the work, and a state in which the moving body is in the retracted position away from the work in conjunction with the moving body. With the interlocking means for separating the cutting fluid tank from the work against the spring force of the spring, and with the cutting fluid tank being separated from the work, the chip discharging hole of the tank is opened and the chips are dropped downward. It is a deep hole drilling apparatus characterized by including a discharge means. Further, according to the present invention, the interlocking means has one end fixed to the tank, is provided in the retreat position side and extends in parallel with the moving direction, and is provided midway in the longitudinal direction of the moving shaft, and is directed toward the work by the spring. It is characterized in that it has a projection to which a spring force is applied and a moving piece that is fixed to the moving body and that abuts on the projection and moves the projection so that the cutting fluid tank separates from the workpiece at the retracted position. Further, in the present invention, the feed driving means moves the moving body close to the work so that the axial depth of the hole to be initially cut exceeds the length of the chip discharge groove of the drill in the drill axial direction. Is characterized by. Further, in the present invention, in the drill, the shank is composed of a processed part on the tip side and a shaft part of the other part, and in the processed part, a cutting edge is formed at the tip part of the shank and a chip discharge groove following the shank is formed. It is formed over a length of about 5 to 10 times the diameter of that portion, the shaft portion is formed to have substantially the same diameter as the machined portion, and a chip oil discharge groove having a minute cross-sectional area is formed on the outer surface of the shank. It is characterized by being formed in the axial direction. Further, in the present invention, in the drill, the shank is composed of a processed part on the tip side and a shaft part of the other part, and in the processed part, a cutting blade is formed at the tip part of the shank, and a chip discharge groove subsequent to the shank is formed. Formed over a length of about 5 to 10 times the diameter of the part,
The shaft portion has a diameter slightly smaller than the diameter of the processed portion.

[0006]

According to the present invention, when a horizontal or oblique horizontal axis or vertical axis deep hole is drilled on a workpiece made of metal, for example, using a drill, it faces the surface of the workpiece to be deep hole drilled. Then, the cutting fluid tank is placed, and the cutting fluid is supplied into this cutting fluid tank.The cutting fluid tank has an axis line on a straight line for guiding the drill by inserting the drill into it. Each has an insertion hole formed therein, and a drill is moved through the insertion hole to drill a work. Generally, at the time of drilling a drill, as described above, the chips are cut by the chip cutting grooves over a length of about 5 to 6 times the diameter of the processed portion of the drill in which the cutting edge is formed, at the most. Although it is ejected, chips cannot be ejected for longer lengths.

Therefore, in the drill used in the present invention, the discharge groove for passing the chips has a length in the drill axial direction which is, for example, about 5 to 6 times the diameter, and is drilled by a depth less than that length. After processing, return the cutting edge of the drill until it reaches at least partially inside the cutting fluid tank, so that the cutting fluid in the cutting fluid tank passes through the through hole on the workpiece side and is drilled in the drilled hole. Get in. By returning the drill as described above, the chips remaining in the chip discharge groove drop into the cutting fluid tank. So, again enter the drill into the already drilled hole,
It is newly less than the maximum length in the axial direction of the drill that allows chips to move and be discharged in the chip discharge groove of the drill, for example, the processing part where the cutting edge of the drill is formed as described above Drilling is newly performed by the amount of less than about 5 to 6 times the diameter. By repeating such an operation, deep hole drilling can be performed to a desired depth.

When the drill enters the already drilled hole and is performing cutting for drilling, the chip discharge groove causes the cutting fluid to be discharged from the drill hole like a screw pump. However, according to the present invention, by returning the drill to the cutting fluid tank as described above, it becomes possible to supply the cutting fluid into the drill hole, which enables the next smooth drilling process. become.

Particularly, in the present invention, the feed drive means moves the drill closer to the work, and the axial depth of the hole to be initially cut exceeds the length of the chip discharge groove of the drill in the axial direction of the drill. Therefore, during the second and subsequent deep hole cutting processes, the entire length of the chip discharge groove of the drill in the axial direction of the drill is within the hole, and therefore the cutting fluid that has once entered the cut hole does not rotate the drill. This prevents it from being discharged as a screw pump. As a result, even when the depth of the hole is large, the cutting fluid is reliably stored in the hole, and the cutting fluid in the hole is not instantaneously discharged by the rotation of the drill. A cutting liquid exists near the tip of the, so that the cutting process can be performed smoothly.

[0010]

1 is a simplified perspective view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a plan view thereof. With reference to these drawings, a work mount 2 is fixed to a base 1.
The work 4 made of metal or the like is detachably fixed to the work piece 4 by the clamp means 3. A cutting fluid tank 6 is arranged on the work mount 2 or the base 1 so as to face the surface 5 of the work 4 to be deep-hole drilled on the horizontal axis. Base 1 and mounting base 2
And constitute a base.

A drill 8 having a horizontal axis is gripped by a chuck 9 and is rotationally driven around the axis of the drill 8 by a rotation driving means 10. Furthermore this drill 8
Together with the rotation drive means 10, the feed drive means 11 reciprocally feeds back and forth in the moving direction which is the axial direction of the drill 8.

FIG. 4 is a sectional view of the cutting fluid tank 6 as viewed from the left side in FIG. The cutting fluid tank 6 surrounds one end wall 13 that abuts the surface 5 of the work 4, another end wall 14 that is spaced from the end wall 13, and the outer peripheral portions of these end walls 13 and 14. It has a peripheral wall 15. A connection port 16 is provided in the upper part of the peripheral wall 15 of the tank 6, and the pipe 1
A cutting fluid is supplied from a pump 18 via 7. The pump 18 may be, for example, a centrifugal pump, and its supply pressure may be a relatively low pressure, for example, slightly higher than atmospheric pressure.

The end walls 13 and 14 are formed with insertion holes 19 and 20 through which the drill 8 can be gently inserted.
The insertion holes 19 and 20 are formed in a slender cylindrical shape elongated in the axial direction, and have a function of inserting the drill 8 and preventing the drill 8 from resting and guiding it. These insertion holes 19 and 20 are
The drills 8 each have an axis on a straight line extending from the axis of the drill 8. The end wall 13 may be parallel to the surface of the work 4 on the drill 8 side, and the other end wall 14 may be parallel to the end wall 13 or may be inclined.

The chuck 9 of the drill 8 is rotatably provided on the moving body 27, and the moving body 27 can reciprocate in the moving direction which is the axial direction of the drill 8. Moving body 27
Is provided with a motor 28, and the chuck 9 is rotationally driven about its axis through a power transmission means such as a belt 29. The moving body 27 can move along a pair of rails 30 mounted on the base 1.

FIG. 5 is a simplified sectional view taken along the section line VV of FIG. In the feed drive means 11, the base 1 is provided with a positioning motor 31, which drives the ball screw 32 to rotate about its axis. The ball screw 32 has an axis in a plane passing through the axis of the drill 8 and is parallel to the axis of the drill 8.
The nut 33 screwed onto the ball screw 32 is fixed to the moving body 27. In this way, the ball screw 32 is rotationally driven by the motor 31, whereby the moving body 27 is reciprocated.

A drill 8 is provided on the end wall 14 of the cutting fluid tank 6.
One end portions of the pair of moving shafts 34 parallel to the axis line of are fixed. The moving shaft 34 can be moved in the axial direction by guide members 35 and 36 which are erected and fixed on the base 1. A protrusion 37 is fixed to the moving shaft 34, and the compression spring 3 is provided between the protrusion 37 and the guide member 36.
8 is interposed. This spring 38 applies a spring force to the projection 37, and hence the moving shaft 34 and the cutting fluid tank 6 toward the work 4. A moving piece 40 having an insertion hole 39 through which the moving shaft 34 is inserted is fixed to the moving body 27. The movable piece 40 moves the protrusion 37 against the spring force of the spring 38 so that the cutting fluid tank 6 separates from the work 4 at the retracted position of the movable body 27 shown in FIGS. 1 and 2.

In the cutting fluid tank 6, the insertion holes 19, 2
Below 0, a storage space 21 for storing chips is formed.

Referring again to FIG. 2, a chip discharge hole 42 is formed in the lower portion of the peripheral wall 15 of the cutting fluid tank 6. When the moving body 27 is in the retracted position as shown in FIG. 2, the end wall 13 of the cutting fluid tank 6 is indicated by the reference symbol L from the end surface of the work 4.
1, the chip discharge holes 42 are aligned with the chip guide holes 43 formed in the lower part of the bed 1,
Therefore, the chips accumulated in the lower part of the space 21 of the tank 6 are discharged from the guide hole 43 together with the cutting fluid into the pipe line 44.
And then discharged to the outside. A state in which the movable body 27 moves from the retracted position toward the work 4 and cuts the work 4 using the drill 8, and the cutting edge of the drill 8 is at least partially inside the storage space 21 of the cutting fluid tank 6. Then, the end wall 13 of the cutting fluid tank 6 is pressed against the end surface of the work 4 by the spring force of the spring 38, and at this time, the chip discharge hole 42 of the cutting fluid tank 6 is guided by the guide hole 43. It is out of alignment and closed.

FIG. 6 shows one insertion hole 1 of the cutting fluid tank 6.
9 is an enlarged cross-sectional view around 9. An attachment hole 45 is formed in the end wall 13, and an outward flange 47 integrally formed with a short cylinder 46 having the insertion hole 19 is detachably attached to the end wall 13 by a bolt 48. This short cylinder 46
The inner diameter of the insertion hole 19 formed in 1 is selected in accordance with the outer diameter of the drill 8 so that the drill 8 can be smoothly inserted and withdrawn and guided. Another end wall 1
4 is also provided with a drill guide 49 having this barrel 46 and an outward flange 47, as indicated by reference numeral 49a.

FIG. 7 is a block diagram showing the electrical construction of the embodiment shown in FIG. The feed amount along the axial direction of the drill 8 is detected by the feed amount detection means 25 and is given to the processing circuit 26 realized by a microcomputer or the like. The processing circuit 26 controls the rotation driving means 10, the feed driving means 11, the pump 18, etc. as described above.

The drill 8 has a working portion in which a cutting edge is formed at the tip of the shank, and the working portion is formed over a length of, for example, about 5 to 6 times the diameter of the working portion, which is twisted. The groove is a chip discharge groove, and the shaft portion following the processed portion is formed to have substantially the same diameter as the processed portion, and the cutting fluid discharge groove is formed on the outer surface in the axial direction of the shank.

FIG. 8 is a flow chart for explaining the operation of the processing circuit 26 for automatically performing deep hole drilling on the horizontal axis.
The operation will be described with reference to the sectional views shown in FIGS. 8 and 9. From step a1 to step a2, as shown in FIG.
As shown in (1), while the drill 8 is being rotationally driven, the feed driving means 11 penetrates the drill 8 through the insertion holes 20 to 19 of the cutting fluid tank 6 and drills a depth L1. The depth L1 is selected to be a predetermined value that is less than the maximum axial length L0 of the drill 8 in which the chips can move in the chip discharge groove of the drill 8. That is, the axial depth L1 of the hole to be cut at the first time is determined so as to exceed the length L0 of the chip discharge groove of the drill in the axial direction of the drill, so that the hole enters the hole during the second and subsequent cutting processes. It is possible to prevent the cutting fluid from being instantaneously discharged by the action of the screw pump of the drill, which allows the cutting fluid to remain in the hole and perform smooth cutting.

At step a3, n = 1, and at step a4, as shown in FIG. 9 (2), the drill 8 is used.
After drilling, is returned by the distance L2.

L2 = L1 + ΔL1 (1) The tip portion 58 of the drill 8 reaches the inside of the cutting fluid tank 6, and the drill 8 is in the insertion hole 20 of the end wall 14. As a result, the chips in the chip discharge groove of the drill 8 fall into the storage space 21 of the cutting liquid tank 6, and the cutting liquid in the tank 6 enters the insertion hole 19 and the previously drilled hole 59. enter in. Since the drill 8 is inserted into the insertion hole 20, the insertion hole 2
A large amount of wasted cutting fluid will not be discharged from 0.

After the chips have been discharged from the chip discharge groove of the drill 8 and the cutting fluid has been supplied into the drill hole 59, the drill 8 is fed into the drill hole 59 by the driving means 11 in step a5 of FIG. After entering and advancing by the distance L2, at step a6, as shown in FIG. 9 (3), drilling is performed by the length L3 (= L1). In step a7, it is determined whether or not the hole has been drilled to the desired depth. If not, n is incremented by 1 in step a8 and the process returns to step a4. In FIG. 9 (4), the drill 8 has a distance L4 (= L2
+ L3) only, and supply of cutting fluid to the drill hole 60,
Discharge chips. By repeating such an operation, the work 4 is perforated to a desired depth.

After cutting the drill hole 60, the moving body 27 is brought to the retracted position shown in FIG. 2 described above, so that the guide shaft 34, and thus the cutting fluid tank 6 is moved to the retracted position shown in FIG. It is displaced to the right in FIG.
1 is opened, so that the chips in the storage space 21
The chips are discharged from the chip discharge hole 42 through the guide hole 43 and the pipe line 44.

In the above-mentioned embodiment, the drill 8 is constructed so as to be moved in the axial direction by the feed drive means 11, but as another embodiment of the present invention, the work 4 and the cutting fluid tank 6 are integrally drilled. 8 may be configured to move in the axial direction, and the drill 8 may not be configured to move in the axial direction at this time. Further, as another embodiment of the present invention, the drill 8 and the work 4 and the cutting fluid tank 6 may be configured to be displaced and driven in the directions of approaching and separating from each other.

The cutting edge of the drill 8 may be formed over a sufficiently short length so that sufficient strength can be obtained.

The cutting fluid tank 6 can be modified in other ways. In either of the end walls 13 and 14 or the peripheral wall 15 of the cutting fluid tank 6, an openable / closable discharge port is formed for discarding chips and discharging the chips from the internal space thereof. It may be configured to be covered by an openable / closable lid, and such a configuration is also included in the spirit of the present invention.

The invention is not only carried out for transverse drilling, but also for longitudinal drilling, for example with a vertical axis, and for oblique drilling.

The cutting fluid pump 18 may be any structure such as a centrifugal pump or an axial flow pump in which the impeller rotates. In such a construction, even if chips are mixed in the cutting fluid, the ability is not affected. However, it is preferable that the cutting fluid can be smoothly pumped without causing a failure, but a gear pump, a piston pump, or the like may be used, and a pump having another configuration is used. Of course, it is good.

The drill 8 of the present invention is preferably the drill shown in FIGS. 10 to 12, and also the drills shown in FIGS. 14 and 15.

In FIGS. 10 and 12, the shank 61 of the drill comprises a working portion L and a shaft portion m. In the working portion L, a cutting edge 64 is formed at the tip of the shank 61 and a chip discharge groove 62 following it. The shaft portion m is formed to have a diameter substantially equal to the diameter D of the machined portion L, and a plurality of chip oil discharge grooves 63 having a minute cross-sectional area are formed on the outer surface in the axial direction of the shank 61. Has been done. Only one pair of the chip oil discharge grooves 63 may be formed so as to be continuous with the pair of chip discharge grooves 62, respectively. The chuck 71
The chip oil discharge groove 63 is not formed in the above.

The length of the processed portion L is set to, for example, about 5 to 10 times the diameter D of the portion. The reason for setting in this way is that the range which can be processed by one movement operation of the drill is usually 5 to 10 times the diameter,
Therefore, it is meaningless to set it longer than that, and the longer the portion where the twist groove 62 is formed, the weaker the torsional rigidity of the shank 61 becomes.
As another example, L / D may be about 2 to 10 times, and may have other values.

The chip oil discharge groove 63 is shown as a semi-circular shape in the illustrated example, but since this discharge groove is only for discharging the chip oil, its shape is V-shaped, U-shaped, etc. You can choose it for your body. The size of the cross-sectional area is preferably set as small as possible within a range in which chip oil can be discharged so as not to weaken the bending and torsional rigidity of the shank. For example, the groove depth may be set to about 0.1 mm. Further, the number of the chip oil discharge grooves 63 may be set so as to match the purpose of discharging the chip oil. It should be noted that if the width of the chip oil discharge groove 63 is increased or the number thereof is increased, the portion 69 between the discharge grooves 63 becomes a projection, but such an aspect is also within the scope of the present invention.

In order to carry out the drilling using the above-mentioned drill, as shown in FIG. 13, first, the material 65 to be cut is processed to a depth I slightly shorter than the working portion L of the above-mentioned drill, and then the drill is raised once. After removing the chips, the drill is again lowered into the machining hole 66 to machine the region II. The chip oil is constantly supplied to the drill during this processing so that the chip oil is continuously supplied into the processing hole 66. When the region II is machined, the entire chip discharge groove 62 is immersed in the machining hole 66. Therefore, the chip oil in the machining hole 66 moves from the chip discharge groove 62 to the chip oil discharge groove as the drill descends. It will be discharged through 63. With the chips generated by the processing of the region II being held in the chip discharge groove 62, the drill is raised and discharged above the processing hole 66, and then is lowered again to perform the processing of the region III in the same manner. In this way, machining is carried out little by little within the range where the chips can be held in the chip discharge groove 62. Even when machining is performed using a conventional drill in which the chip discharge groove 62 is formed over the entire shank, it becomes difficult to discharge chips when the drilled hole becomes deep. Therefore, the drill is lifted in the same manner as above to discharge chips. Therefore, the processing method is basically the same as the conventional method.

In the above-described machining, the drill has the chip discharge groove 62 formed only in the minimum necessary portion, and the other portion has a high rigidity in which the twist groove (chip discharge groove) is not formed. As a result, the margin for enlarging the machined hole is very small, and highly accurate deep hole machining can be performed.

A drill having another structure suitable for the present invention is shown in FIGS. 14 and 15. 14 and 15, the shank 81 of the drill is the processed portion L.
The shank 81 has a cutting edge 84 formed at the tip of the shank 81 and a chip discharge groove 82 following the cutting edge 84. The shank 81 has a diameter d of the shank 81.
It is formed to have a diameter slightly smaller than the diameter D of the cutting oil so that the chip oil is discharged from the gap between the processing hole and the outer peripheral surface of the shaft portion m. The diameter of the chuck portion 91 does not need to be reduced, and may be set to the diameter D of the processed portion.

The length of the processed portion L is about 5 times the diameter D of the portion.
It is set to 10 times, especially about 5 times. The reason for setting in this way is that the range that can be machined by one drill lowering operation is usually 5 to 10 times the diameter. This is because the longer the portion where the groove 82 is formed, the weaker the torsional rigidity of the shank 81 becomes. As another example, L / D may be about 2 to 10 times, and may have other values.

The diameter d of the shaft portion m is as large as possible in the processed portion L.
It is preferable to make the diameter equal to the diameter D of the shank 81 in order to increase the rigidity of the shank 81. However, the difference between the two becomes a gap formed on the outer periphery of the shank 81 when it is inserted into the machined hole, from which chip oil is removed. Since it needs to be discharged, it should be small enough to allow the chip oil to pass through. To perform the hole processing using the above-mentioned drill, it is as shown in FIG. 13 described above.

[0041]

As described above, according to the present invention, the tank to which the cutting fluid is supplied is arranged so as to face the surface of the workpiece to be deep-drilled, and the drill inserts the insertion hole of the cutting fluid tank. The hole is drilled through the workpiece, and the chips can move within the chip discharge groove of the drill. Less than the maximum length in the axial direction of the drill, for example, the machined part of the drill with the cutting blade is the machined part. After drilling less than about 5 to 6 times the diameter of the drill, return the drill until the cutting edge of the drill reaches the cutting fluid tank, thereby supplying the cutting fluid into the drill hole, and then , A new drilling is performed again, and thus the drill in which the cutting edge is formed over an undesirably long range is not necessary in the present invention, the strength of the drill is increased, and the drill is bent. Instead of drilling It is possible to perform accuracy.

Further, according to the present invention, after drilling, the drill is once returned until the tip of the drill reaches the cutting fluid tank, whereby the cutting fluid is supplied into the drill hole as described above. Not only that, the chips that have entered the chip discharge groove of the drill are discharged, so that the cutting power can be reduced and the drilling can be performed smoothly.

Further, according to the present invention, the cutting fluid to be supplied to the cutting fluid tank may be supplied at, for example, the atmospheric pressure or a pressure close to the atmospheric pressure, and therefore, the pump for supplying the cutting fluid to the cutting fluid tank is low. Any pressure rating may be used as long as it has a pressure rating, and the structure is simple.

Further, according to the present invention, deep hole machining can be automatically performed.

Especially, the pump for supplying the cutting fluid is a centrifugal pump or an axial flow pump, so that even if the cutting fluid is mixed with chips, the cutting fluid can be caught without adversely affecting its performance. It is excellent in that the cutting fluid can be smoothly supplied without performing.

Further, according to the present invention, during the first cutting,
The axial depth of the hole to be cut is determined so as to exceed the length of the chip discharge groove of the drill in the axial direction of the drill,
This prevents the cutting fluid that has entered the hole from being discharged by the screw pump action of the chip discharge groove of the drill during the second and subsequent cutting, and ensures that the cutting fluid exists near the tip of the hole. Thus, the cutting process can be performed smoothly.

[Brief description of drawings]

FIG. 1 is a simplified perspective view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is a simplified cross-sectional view showing a part of the configuration of the embodiment shown in FIG.

FIG. 3 is a simplified plan view of the embodiment shown in FIGS. 1 and 2.

4 is a sectional view of the cutting fluid tank 6 as viewed from the left side of FIG.

5 is a simplified cross-sectional view taken along the section line VV of FIG.

FIG. 6 is an enlarged cross-sectional view of a part near the end wall 13 of the cutting fluid tank 6.

FIG. 7 is a block diagram showing an electrical configuration of the embodiment shown in FIGS.

8 is a flowchart for explaining the operation of the processing circuit 26 of FIG.

FIG. 9 is a cross-sectional view for explaining the horizontal axis deep hole drilling operation of the embodiment shown in FIGS.

FIG. 10 is a side view showing the configuration of a preferable drill of the present invention.

11 is a bottom view of the drill shown in FIG.

FIG. 12 is a section line III- of the drill shown in FIG.
It is sectional drawing seen from III.

FIG. 13 is a cross-sectional view showing a state when performing deep hole drilling using the drill shown in FIGS. 10 to 12.

FIG. 14 is a side view showing a drill according to still another embodiment of the present invention.

15 is a bottom view of the drill shown in FIG. 14. FIG.

[Explanation of symbols]

 1 base 2 work mount 4 work 6 cutting fluid tank 8 drill 9 chuck 10 rotation drive means 11 feed drive means 13, 14 end wall 15 peripheral wall 16 connection port 18 pump 19, 20 insertion hole 21 storage space 25 feed amount detection means 27 Moving body 28 Rotation drive motor 30 Rail 31 Feed drive motor 32 Ball screw 33 Nut 34 Guide shaft 35, 36 Guide member 37, 40 Projection portion 38 Compression spring 37 Insertion hole 42 Chip discharge hole 43 Guide hole 44 Pipe line

Claims (11)

[Claims] 1. A cutting liquid is supplied to the inside of a workpiece, which is arranged so as to face a surface to be deep-drilled, through which a drill is inserted and is guided, and through holes each having an axis line on a horizontal straight line. Cutting fluid supply device for deep hole machining. 2. The cutting fluid supply device for deep hole machining according to claim 1, wherein a storage space for storing chips is formed below the insertion hole. 3. The cutting fluid supply device for deep hole machining according to claim 1, wherein at least a part of the wall facing the storage space can be opened and closed. 4. (a) An insertion hole, which is arranged so as to face a surface of a workpiece to be deep-drilled, is guided by a drill and has an axis line on a horizontal straight line, and is internally cut. First step of preparing a cutting fluid tank for deep hole machining to which the liquid is supplied, and (b) the drill can be driven through the insertion hole to push the workpiece, and the chips can be driven in the chip discharge groove of the drill. The second drilling process is performed less than the maximum axial length of the drill.
Step 3) (c) Return the drill until the tip of the drill reaches the inside of the cutting fluid tank, and discharge the chips to the cutting fluid tank
And (d) repeating the second and third steps until the hole to be cut is near the desired depth. 5. The axial depth of the hole cut in the first second step is determined so as to exceed the length of the chip discharge groove of the drill in the drill axial direction. Deep hole drilling method. 6. A work mounting base to which a work is detachably fixed and mounted, a rotation driving means for rotating and driving the drill around the drill axis, and a relative direction between the work mounting base and the drill, and the axial direction of the drill. And a pair of insertion holes that are provided on the drill side of the work, facing the surface of the work to be deep-drilled, through which the drill is inserted and that have an axis on the axis of the drill. Are formed at intervals in the axial direction, and the cutting fluid is supplied inside,
A cutting fluid tank that can be opened and closed to discharge chips, and a feeding means that controls the chips so that they can escape in the chip discharge groove of the drill, less than the maximum axial length of the drill,
A deep hole drilling device comprising: a control unit that repeats an operation of returning the drill after drilling until the tip of the drill reaches the inside of the cutting fluid tank. 7. A base, a fixing means for removably fixing a work to the base, a movable body provided on the base so as to be displaceable in a moving direction of approaching / separating from the work, and provided on the movable body. , Rotation driving means for rotating the drill around the drill axis, feed driving means for reciprocating the moving body in the moving direction, and facing the surface of the work to be deep-drilled on the drill side of the work. Is provided as a guide, and a drill is inserted and guided, and a pair of insertion holes each having an axis on the axis of the drill are formed at intervals in the axial direction, cutting fluid is supplied to the inside, and the drill is displaced in the moving direction. A cutting fluid tank that can be provided with a chip discharge hole at the bottom, a spring that applies a spring force to the cutting fluid tank toward the work, and the moving body moves away from the work in conjunction with the moving body. State in retracted position , Interlocking means for separating the cutting fluid tank from the work against the spring force of the spring, and with the cutting fluid tank separated from the work, open the chip discharge hole of the tank to discharge the chips downward And a deep hole drilling device. 8. The interlocking device has one end fixed to the tank, a moving shaft extending parallel to the moving direction on the retracted position side, and provided in the middle of the moving shaft in the longitudinal direction, and directed toward the work by the spring. It has a protrusion to which a spring force is applied, and a moving piece fixed to the moving body and abutting against the protrusion to move the protrusion so that the cutting fluid tank separates from the work at the retracted position. Item 7. A deep hole drilling device according to item 7. 9. The feed drive means moves the moving body close to the work so that the axial depth of the first hole to be cut exceeds the length of the chip discharge groove of the drill in the drill axial direction. 9. The deep hole drilling device according to claim 7 or 8. 10. The drill has a shank composed of a processed part on the tip side and a shaft part of the other part, and the processed part comprises:
A cutting edge is formed at the tip of the shank, and a chip discharging groove following the shank is formed over a length of about 5 to 10 times the diameter of the portion, and the shaft portion is formed to have substantially the same diameter as the working portion. The deep hole drilling device according to any one of claims 6 to 8, wherein a chip oil discharge groove having a minute cross-sectional area is formed on the outer surface in the axial direction of the shank. 11. The drill has a shank including a processed portion on the tip side and a shaft portion of the other portion, wherein the processed portion has a cutting edge formed at the tip end of the shank and a chip discharge groove following the cutting blade. 9. The method according to claim 6, wherein the shaft portion is formed over a length of about 5 to 10 times the diameter of the portion, and the shaft portion has a diameter slightly smaller than the diameter of the processing portion. Deep hole drilling device described.