JPH0790408B2 - Deep hole machining tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a deep hole machining tool for machining a workpiece having a deep hole such as a spindle of a machine tool.

[Conventional technology]

Conventionally, there are various deep hole drilling methods, and the following three methods are known as typical methods. That is, the first
As a method of gun drilling, the high pressure cutting oil is fed from the rear end of the tool into the oil hole that penetrates the inside of the tool having an eccentric cutting edge, flows out from the tip to the cutting point, and is accompanied by the chips generated by cutting, and the V It is discharged to the outside through the groove.

The second method is a method called an ejector drill method, which has a double oil hole in the drill, supplies oil from the outer flow passage, and discharges it together with chips in the inner flow passage.

Furthermore, the third method is called the BTA method, in which oil is supplied from the clearance between the drill and the inner surface of the hole and discharged from the hole at the center of the drill as described above. In any of the above methods, the tool is exclusively attached according to the work.

However, all of these three methods have a problem that they require manual setup change and are manually machined by a dedicated drilling machine, resulting in poor production efficiency and high manufacturing cost.

Therefore, the present applicant has already filed in Japanese Patent Application No. 63-213895
Using the above-mentioned ejector drill method, with a general-purpose machine tool such as a machining center, the tool for deep hole machining is automatically converted by using ATC, and the work is also carried into the table by the conveyor and set automatically at the machining positioning position. Disclosed is a deep hole drilling method and apparatus for automatically performing deep hole drilling.

[Problems to be Solved by the Invention]

However, even in the invention disclosed in the above-mentioned Japanese Patent Application No. 63-213895, the structure of the tool for deep hole machining is still complicated, so that it is inevitably large and heavy.

The present invention has been devised in view of the above points, a tool shank and a tool holder are integrated, a deep hole machining tool capable of automatically exchanging from the tool storage magazine to the spindle by gripping the tool holder, In addition to making it lighter and more compact,
It is to provide a tool for deep hole drilling that has versatility.

[Means for Solving the Problem and Its Action]

In order to solve the problem, in the present invention, a tool holder having a straight spindle attachment / detachment portion for detachably attaching to a rotatable spindle of a machine tool, and a slide bearing provided around the outer periphery of the tool holder. Via a support member that rotatably supports the tool holder via an outer tube and an inner tube that are screwed directly into the tool holder or screwed and inserted through an intermediate member. A tool shank provided with a machining edge, the tool shank communicates with the support member and the tool holder from the machine tool body when the tool shank is inserted into the tool holder, and the inner tube of the tool shank Coolant supply means for supplying high-pressure fluid to the cutting edge of the tip via the flow path between the outer tube, the inner tube of the tool shank, and the tool holder The ejector arranged between the inner wall surface of the through hole and the support member and the tool holder are engaged so as to integrally hold them, and when the machine tool main body is pressed, the engagement between the both is released. , An elastic member capable of adjusting the engagement pressure with the machine tool main body, and a detachable engagement device on the support member, and the coolant in the state in which the tool shank, the ejector and the tool holder are connected. When the supply means and the tool holder are inserted into the machine tool body, the tube inside the tool shank, the through hole of the ejector and the through hole of the tool holder communicate with the through hole of the spindle of the machine tool body to form a discharge path. Then, the engagement between the tool holder and the support member is released by the operation of the engagement device,
The tool holder, the tool shank, and the like are rotatable.

It is preferable that an adjusting member is provided in the engaging device so that the movable engaging member that directly engages with the tool holder can change its moving position by contact with the machine tool main body.

By adopting the above configuration, the weight of the tool has been reduced and the size has been reduced. Further, the tool can be made versatile by the detachable and replaceable structure of the detent engagement means.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional front view of a deep hole drilling tool of the present invention, and FIG. 2 is a front view of the same deep hole drilling tool (including a structure in which a detent engagement means is removable and replaceable). 3 is the second
FIG. 3 is a sectional view taken along line III-III in the figure.

As shown in FIG. 1, a deep hole drilling tool A of the present invention is mounted on a collet chuck 2 of a rotatable spindle 1, and a tool holder 3 having a straight shank shape is mounted. Although not shown, for example, ATC
With this (automatic tool changer), this tool holder 3 is
And the tool storage magazine can be exchanged. FIG. 1 shows a state in which a deep hole drilling tool A is positioned and attached to the spindle 1 with a key 4. The tool holder 3 is rotatably supported by a support member 6 via a slide bearing 5, which is one of the gist of the present invention. The slide bearing 5 is preferably made of a material such as Teflon. On the outer periphery of the support member 6, a coolant supply pipe 7 extends in parallel with the tool holder 3 via an elbow, and a tip portion thereof forms a joint 8.

The tool shank 9 is similar to the conventional ejector drill type, and has a double tube structure of an outer tube and an inner tube, and the outer tube 10 is screwed into the inner diameter hole 3b of the tool holder 3. is doing. Tool shank 9
If the tool is a deep hole drilling tool that is commonly used for small to large diameters (bottom view of the cross section in FIG. 1), a large diameter tool shank is screwed directly into the inner diameter hole 3b. However, in the case of a small diameter tool shank, the tool shank 9 is attached via the intermediate joint member 24. Also, the inner tube 11 is the same as the tool holder 3
It is fitted in the inner diameter hole 12a on the work side of the ejector body 12 which is fitted in the inner diameter hole 3b. And the outer tube 10
The flow path of the coolant pipe 7 communicates with the space 13 between the inner tube 11 and the inner tube 11, and the coolant from the coolant source is supplied through this space 13. The inner diameter of the inner tube 11 is the discharge space portion 14,
Similarly, the ejector body 12 is also formed with a hole penetrating therethrough, and further communicates with the through hole 1a of the spindle 1 through the through hole 3c of the tool holder 3. That is, the coolant enters the tool holder 3 from the coolant source through the coolant pipe 7, passes through the space 13 between the outer tube 10 and the inner tube 11 of the tool shank 9, and is pumped to the work side. The cutting edge 15 of the tool A is cooled and passes through the discharge space portion 14 of the tube 11 having the inner diameter together with the chips, and the space portion 13 of the ejector body 12 and the through hole 12
It is sucked by the negative pressure generated by the jet from the nozzle 12b formed between c, and further discharged through the through hole 3c of the tool holder 3 and the through hole 1a of the main shaft 1 to the outside.

On the other hand, the engaging means for preventing the tool holder 3 and the support member 6 from rotating is constructed as follows. That is, as shown in FIG. 2, the body 17 having the guide portion 17a on the lower surface (tool holder 3) side is detachably fastened to the pipe 7 by the bolts 18 and 19 of the mounting portion. However, this body may be attached to the support member 6. A shaft 21 for receiving the engaging member 20 that is movable in the hole of the cylindrical portion is provided at the axis of the cylindrical portion of the body 17, and a nut for preventing the engaging member 20 from coming off is provided on the shaft 21. It is screwed to the main shaft 1 side. Further, a compression coil spring 22 which is wound around the shaft 21 and biases the engaging member 20 toward the main shaft 1 is installed. On the lower surface of the engaging member 20 on the elbow side, a part of the brim-shaped engaging portion 20a is provided.
The tool holder 3 is inserted into the stepped portion 6a of the tool holder 3 and is fitted in the groove 23a formed in the upper surface of the ring body 23 so that the tool holder 3 is relatively positioned with respect to the support member 6. It prevents it from turning. When the tool holder 3 is completely installed in the collet chuck 2, the tip of the engaging member 20 abuts the machine body, and the engaging member 20 contracts against the bias of the spring 22. The member 20 moves to the elbow side, and the engaging portion 20
a is disengaged from the groove 23a of the ring body 23, and the detent of the tool holder 3 is released.

With such a configuration, the deep hole drilling tool A is automatically inserted into the spindle 1 of the machine by the ATC, the tool holder 3, the tool shank 9 and the like are rotationally driven, and the cutting edge of the tool A is also rotated to deepen the depth. Hole processing is performed. At this time, the tool holder 3 is rotated with respect to the support member 6 via the slide bearing 5. Coolant is supplied from the support member 6 side as described above.

Although the moving position of the engaging member is limited with respect to the body 17 in the embodiment, the method of another embodiment shown below is as shown in FIG. A bolt 30 is provided in the portion so that the bolt 30 can be freely inserted and removed. When the bolt 30 comes into contact with the main body, it is confirmed that the engaging portion 20'a is properly disengaged from the groove 23'a. It is configured so that the moving position of the engaging member can be changed. (Note that in FIG. 4, the same components as those in FIG. 2 are shown by adding ').
Compared to 5), since a slide bearing is adopted instead of the ball bearing, it is possible to significantly reduce the weight and size, and it is possible to solve the problem of sealing the ball bearing. Further, since the detent engagement means between the tool holder and the support member is detachable and replaceable or adjustable, versatility can be provided.

〔The invention's effect〕

As described above, according to the deep hole machining tool of the present invention,
Since the bearing between the tool holder and the support member is a sliding bearing, the diameter of the support member is made as small as possible to make it lighter and more compact. Since it can be attached to a chuck used in a machine tool, and the detent engagement means can be removed and replaced or the dimensions can be adjusted, various types of work in which the relative positions of the machine tool body and the tool insertion part are different It can also be applied to machines.

[Brief description of drawings]

FIG. 1 is a cross-sectional front view of a deep hole drilling tool of the present invention, and FIG. 2 is a front view of the same deep hole drilling tool (including a structure in which a detent engagement means is removable and replaceable). 3 is the second
FIG. 4 is a sectional view taken along the line III-III in FIG. 4, and FIG. A: Deep hole drilling tool 1 ... Spindle, 3 ... Tool holder 5 ... Slide bearing, 6 ... Supporting member 7 ... Pipe, 8 ... Joint 9 ... Tool shank, 10 ... Outer tube 11 …… Inner tube, 12 …… Ejector body 13 …… Space, 14 …… Discharge space 15 …… Blade edge, 17 …… Body 17a …… Slit, 20 …… Engagement member 20a …… Engagement Part, 21 ... Shaft 22 ... Compression coil spring, 23 ... Ring body 23a ... Groove

Claims (1)

[Claims] 1. A tool holder having a straight spindle attachment / detachment portion for detachably attaching to a rotatable spindle of a machine tool, and this tool holder via a slide bearing provided around the outer periphery of the tool holder. A rotatably supporting member, and an outer tube and an inner tube that are screwed directly into the tool holder or screwed and inserted through an intermediate member, and a cutting edge is provided at the tip. Of the tool shank, the tool shank communicates with the support member and the tool holder from the machine tool body when the tool shank is inserted into the tool holder, and the inner tube and the outer tube of the tool shank Between the coolant supply means for supplying high-pressure fluid to the cutting edge of the tip via the flow path between the tube inside the tool shank and the inner wall surface of the through hole of the tool holder. The ejector arranged is engaged with the support member and the tool holder so as to integrally hold them, and when the ejector is pressed against the machine tool main body, the engagement between the both is released and the engagement pressure with the machine tool main body is released. An engaging device that is detachable from the supporting member with an elastic member that can adjust the tool shank, the ejector, and the tool holder connected, and the coolant supply means and the tool holder are machined. When inserted into the machine body, the tube inside the tool shank, the through hole of the ejector,
The through hole of the tool holder is communicated with the through hole of the main shaft of the machine tool body to form a discharge path, and the engagement between the tool holder and the support member is released by the operation of the engagement device. A deep hole drilling tool characterized in that the shank etc. can be rotated.