JPS646166Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application/object) This invention relates to a cutting device for deep hole machining of a workpiece such as a metal material.

In particular, cutting oil is forcibly supplied to the drill head using the gap in the tool shank for attaching the drill, and cutting waste and cutting oil cut by the drill head are sucked through the hollow part of the tool shank (ejector). This applies to cutting equipment that discharges water to the outside due to

(Conventional Example) In deep hole machining, the ability to discharge the cutting debris generated inside the cut hole and the cutting oil (called coolant) flowing into the cut hole to the outside determines the deep hole cutting speed. If it is inferior, no matter how high the tool system's capabilities are, it is impossible to expect an improvement in cutting speed.

Therefore, various cutting waste discharge devices have been proposed in the past, and a typical structure thereof is as shown in FIG.

That is, the cylindrical tool shank 2 supported by the shank receiver 1 is made up of a double tube consisting of an outer tube 2a and an inner tube 2b. The supply casing 4 is connected, and a portion of the cutting oil supplied at high pressure from the supply hole 5 of the casing 4 flows into the opposing gap between the outer tube 2a and the inner tube 2b in the tool shank 2, as shown by the arrow. 6 to the cutting edge 3a of the drill head 3, and the other part is ejected from the slit 7 formed in the inner tube 2b into the interior 8 of the inner tube 2b, and is discharged to the outside as it is. A vacuum is created inside the inner tube 8 due to the ejector effect of
A suction effect occurs. Therefore, the cutting caused by forming the deep hole H by the rotation of the cylindrical tool shank 2 (FIG. 3 shows this type), the rotation of the workpiece W, or the relative rotation of the two. The chips and cutting oil supplied to the cutting edge 3a are sucked into the inner tube interior 8 by the above-mentioned suction action and are discharged to the outside through the discharge hole 9. This conventional type has the following features. There are some difficulties.

That is, the inner tube 2b is provided with a slit 7 on its outer periphery in order to produce the ejector effect as described above.
As shown in the figure, since it is provided directly on the thin inner tube 2b, when ejecting cutting waste, it may get caught in the slit and weaken the ejector effect, or other cutting waste may be moored to the caught cutting waste, causing cutting at this part. There have been many cases where the inside 8 of the inner tube 2b is clogged with debris. Furthermore, it is necessary to change the cutting speed or adjust the strength of the ejector effect depending on the hardness and consistency of the workpiece. To do this, the opening area of the slit must be changed, but this is not possible in the conventional method. Naturally, the entire inner tube with the slits had to be replaced, which was expensive.

(Purpose of the invention) Therefore, this invention prevents the ejected cutting chips from getting caught on the inner wall of the inner tube, and easily strengthens or weakens the ejector effect by simply replacing some parts without replacing the inner tube. The object is to provide a device of this kind that can be adjusted.

(Structure of the invention) In order to achieve the above object, this invention attaches a drill head to the tip of a cylindrical tool shank consisting of a double tube of an outer tube and an inner tube, and connects the outer tube and the inner tube. Cutting oil is supplied through the opposing gap to the drill head, which drills a hole in the workpiece, and the cutting waste and cutting oil are discharged through the interior of an inner tube communicating with the drill head. In the deep hole cutting device, a configuration is adopted in which an adapter having a through hole communicating with the opposing gap is attached to the rear end of the cylindrical tool shank, and an ejector nozzle that opens in the cutting waste discharge direction is provided on the adapter. It is something to do.

(Example) An example of this invention will be described below with reference to drawings. Figure 1 shows an example of the invention applied to a so-called tool rotating casing in which a workpiece is fixed in a fixed position and a drill head rotates to cut the workpiece. This shows an example of a cylindrical tool shank 1 consisting of a double tube of an outer tube 10a and an inner tube 10b.
Naturally, a drill head 3 (designated with the same reference numeral as in the conventional example) is attached to the tip of the drill head 0, and the opposing gap 1 between the outer tube 10a and the inner tube 10b is
Cutting oil is passed through the drill head 3 to the cutting edge 3a of the drill head 3.
(The same reference numerals as in the conventional example) are supplied in exactly the same way as in the conventional example. A spindle 15 is supported through a casing 14 having a cutting oil supply hole 12 and a cutting oil and cutting waste discharge hole 13 in a watertight manner by a bearing 16 and a labyrinth seal 17. A hollow part 18 is formed in the axial direction, and a passage 1 at the rear of the hollow part 18 is formed.
9 communicates with the discharge hole 13 of the casing 14. A through hole 2 that communicates the opposing gap 11 of the tool shank 10 and the cutting oil supply hole 12 is provided in this hollow part.
0 and a collet 23 connected to this adapter 21 via a fitting part 22 are fitted, and the rear ends of the outer tube 10a and the inner tube 10b forming the tool shank 10 are connected to the adapter 21. Fitted in a watertight manner. Then, by screwing the union nut 24 attached to the collet 23 into the union screw 25 carved on the outer periphery of the tip of the spindle 15, the adapter 21 connected to the collet 23 is fixed at a fixed position in the hollow part 18. On the other hand, by loosening the union nut 24, the adapter 2
1 can escape from the hollow part 18. A feature of this invention is that the adapter 21 is provided with an ejector nozzle 26 that communicates with the passage 19, that is, the discharge hole 13, and faces in the direction of discharging cutting waste and cutting oil.

Therefore, part of the cutting oil supplied at high pressure from the supply hole 12 as shown by the arrow is supplied to the cutting edge of the drill head through the through hole 20 and the gap 11, and the other part is supplied from the ejector nozzle 26. is ejected toward the passage 19, thereby causing the passage 19
A suction action toward the discharge hole 13 occurs in the inside 27 of the inner tube 10b leading to the drain hole 13, and the finished cutting oil and cutting waste S are forced to pass through the inside 27 of the inner tube 10b as shown in the figure. The liquid is then discharged to the outside through the discharge hole 13.

Fig. 2 shows another embodiment of this invention, in which the workpiece is rotatably supported by a suitable rotary drive means, and the drill head supported without rotation progresses through the cutting process, a so-called fixed tool. This shows an example applied to a fixed casing 30, in which the same components shown in the previous example are built into the hollow part 31 of a fixed casing 30, and since they play exactly the same role, they are given the same reference numerals. Therefore, the explanation will be omitted. In the figure, 32 is a discharge hole, and 33 is a discharge hole.
is the discharge receiver.

(Effects of the invention) According to this invention, an adapter having a through hole communicating with a cutting oil supply gap provided in the shank is attached to the rear end of the cylindrical tool shank, and the adapter is attached to the rear end of the cylindrical tool shank. Since the ejector nozzle is provided with an ejector nozzle that opens toward the direction, the ejector effect that occurs when cutting oil is ejected from this nozzle causes the cutting waste to be sucked and discharged from inside the inner tube. Since they are oriented in the same direction, they do not get caught in the nozzle and are smoothly ejected to the outside, preventing the ejector effect from decreasing and the inner tube from becoming clogged. Furthermore, according to this invention, no slit is provided in the inner tube, and an ejector nozzle is provided in a separate adapter, so that the cutting speed can be changed.
Alternatively, if it is necessary to adjust the strength of the ejector effect depending on the hardness or viscosity of the workpiece, it is only necessary to replace the adapter with a different nozzle diameter, so the adjustment can be made at a lower cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the invention, Fig. 2 is a longitudinal sectional view showing another embodiment, Fig. 3 is a longitudinal sectional view showing a conventional example, and Fig. 4 is the same. FIG. 2 is a perspective view showing main parts of a conventional example. 3... Drill head, 10... Cylindrical tool shank, 10a... Outer tube, 10b...
Inner tube, 11... opposing gap, 20...
Through hole, 21... adapter, 26... ejector nozzle, 27... inside of inner tube.

Claims (1)

[Scope of utility model registration request] A drill head is attached to the tip of a cylindrical tool shank consisting of a double pipe of an outer tube and an inner tube, and cutting oil is supplied to the drill head through the facing gap between the outer tube and the inner tube, and the cutting oil is supplied to the drill head by the drill head. In a deep hole cutting device that drills a hole in a workpiece and discharges cutting waste and cutting oil through the inside of an inner tube that communicates with a drill head, the opposite A deep hole cutting device comprising: an adapter having a through hole communicating with the gap; and an ejector nozzle opening in the cutting waste discharge direction on the adapter.