JPH11207566A - Main spindle device of machine tool with automatic tool changer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lubricate the tip of a cutting tool machining a relatively deep place with an atomized cutting fluid uniformly, reliably, and stably with the use of a simple means. SOLUTION: A main spindle 3, which holds a tool holder 8 and a cutting tool 30 at its nose, is formed through its center with an axial hole 3b extending from the outer end to nose of the main spindle 3, in which hole a cutting-fluid feed pipe 27 is inserted against any rotation even on the rotation of the main spindle 3. The cutting-fluid feed pipe 27 is supplied with an atomized cutting fluid from the outer end of the main spindle 3 so that it jets out from the tip of the cutting tool 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle device of a machine tool which is particularly suitable for lubricating a tip portion of a cutting tool for machining a deep part.

[0002]

2. Description of the Related Art In machining with a machine tool, a large amount of cutting oil is supplied to a machining portion for cooling and lubricating a workpiece and a cutting tool, or removing chips, but this causes environmental pollution caused by the cutting oil. Other problems, such as adverse effects on human health and human health, large costs associated with waste oil treatment of cutting oil, reduced tool life due to excessive cooling of the workpiece, and sliding wear during fine cutting of the cutting tool due to excessive cutting oil. Since a large amount of cutting oil adheres to the chips during processing, it is necessary to separate the cutting oil adhering to the chips when processing and reusing the chips.

In order to solve these problems, in recent years, a very small amount of cutting oil has been supplied in the form of mist to a cutting portion. Such a process is called dry cutting or the like. I have.

[0004] In performing dry cutting, it is possible to supply mist-like cutting oil to the tip of a cutting tool which is processing a relatively shallow portion of the work by simple means. It is practically difficult to feed it to the tool tip which is machining a relatively deep part. The present applicant has disclosed Patent No. 268711 as a means for solving this.
No. 0 is proposed.

[0005]

The above-mentioned Patent No. 26871
According to the spindle device of No. 10, mist-like cutting oil can be supplied very effectively to the tip of a cutting tool for processing a relatively deep portion of a workpiece. Depending on the case, the cost may be too high. An object of the present invention is to provide a spindle device of a machine tool which can cope with such a situation.

[0006]

In order to achieve the above object, according to the present invention, an axial hole extending from the outer end of the main shaft to the front end portion is formed in the center of the main shaft having a tool holder and a cutting tool at the front end. In this hole, a cutting agent supply pipe that is held in a non-rotating state even when the main shaft is rotated is inserted, and mist cutting fluid is supplied from the outer end of the main shaft to the cutting agent supply tube, and from the tip of the cutting tool. The structure is such that the mist cutting fluid is jetted.

During the processing of the workpiece, the main shaft is rotated. During this rotation, the cutting agent supply pipe supplies the mist-like cutting fluid to the vicinity of the tool holder and the cutting tool in the main shaft in a non-rotating state. At this time, the atomized cutting fluid flowing in the cutting agent supply pipe is not affected by the rotation of the main shaft at all, is maintained in a uniformly distributed state, and flows smoothly. Therefore, the cutting fluid is supplied to the tip of the cutting tool stably and relatively uniformly, and the tip of the cutting tool that has reached a deep part of the non-workpiece can be effectively lubricated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described. FIG. 1 is a sectional view showing a spindle device according to the present embodiment, and FIG. 2 is a partially enlarged sectional view of the spindle device.

In these figures, reference numeral 1 denotes a main body frame of the spindle device, and 2 denotes a cylindrical support frame fixed to the main body frame 1 by bolts. The spindle 3 is attached to the cylindrical support frame 2
Are rotatably inserted at fixed positions via bearings 4a and 4b.

At this time, 5a and 5b are ring members fixed to the front end face and the rear end face of the cylindrical support frame 2, 6a and 6b are cylindrical spacers for regulating the positions of the bearings 4a and 4b, and 7 is a bearing. 4b is a threaded ring body for pressing the rear surface of the inner ring of 4b.

The main shaft 3 has a tapered hole 3a at the center of the distal end in which the tapered shank portion 8a of the tool holder 8 is fitted, and a straight central hole 3b is formed continuously with the tapered hole 3a.

Reference numeral 9 denotes a guide cylinder member inserted into the center hole 3b in a state in which the forward movement is locked at the front portion thereof, and an inner peripheral surface 9a of the guide cylinder member is formed with a step portion of an appropriate shape. It has been done. Reference numeral 10 denotes a drawbar, and a guide tube member 9
The enlarged part 10a densely inserted through the packing p
A flange 10b is provided at a position near the rear end to be guided on the inner peripheral surface of the center hole 3b, and a straight hole 10c is formed in the center.

Reference numeral 11 denotes a coned disc spring, which is provided in a stepped and compressed state in a center hole 3b which is located in the middle of the length of the draw bar 10 and between the rear end of the guide cylinder member 9 and the flange 10b. ing.

Reference numeral 12 denotes a holding cylinder member for holding the clamp member 13 so as to be openable and closable, and is screwed to the tip of the draw bar 10. A concave 12a with which the clamp member 13 engages is formed on the peripheral surface of the holding cylinder member 12, and the clamp member 13 is composed of a plurality of locking pieces, which are arranged in the circumferential direction of the concave 12a. It is made cylindrical.

Reference numeral 14 denotes a pulley fixed to the outer periphery of the rear end of the main shaft 3, to which rotation is input from a motor (not shown) via a belt.

Reference numeral 15 denotes an end face cover member fixed to the rear end face of the main shaft 3 by bolts. A rear end portion 10c of the draw bar 10 is inserted into a center hole of the end cover member so as to be displaceable in the front and rear directions f1 and f2.

Reference numeral 16 denotes a locking ring plate which is fitted to the rear end of the main shaft 3 and locked by the end face cover member 15 so as to prevent the rearward escape. This locking ring plate 16
On the rear surface, a cylinder member 17 and a cylinder cover 18 are arranged in this order and fixed by bolts, and a stepped piston 19 is inserted inside the cylinder member 18.

This piston 19 has a center hole and a rear projection 1.
9a, and the rear projection 19a is
8 is inserted into the center hole 8 so as to be slidable in the front and rear directions f1 and f2. At this time, reference numeral 20 denotes a screw pipe member screwed into the center hole of the piston 19, which is displaced by its rotation operation and fastened to its position by the lock nut 21. A passage p1 provided in the cylinder member 18 leads into the cylinder chamber 22 behind the piston 19, and the other passage p2
9 communicates with the cylinder chamber 23 on the front side.

Reference numeral 24 denotes a support frame fixed to the main body frame 1, and reference numeral 25 denotes a straight lubricant supply pipe 27 fixed to the support frame 1 via a coupling member 26. The support frame 24 supports the cylinder member 17 so as to be able to move slightly back and forth, and the cylinder cover 18 is provided between the cylinder cover 18 and the support frame 24 by the front f1.
A spring s is provided for pressing the spring s.

The lubricant supply pipe 27 extends from the connecting member 26 to the front of the screw pipe member 19, the draw bar 10, and the center hole of the holding cylinder member 12 through the center hole of the member 12.

At this time, in order to rotate the lubricant supply pipe 27 at a fixed position of the main shaft 3 at the rear end of the draw bar 10 and inside the center hole of the holding cylinder member 12, needle bearings 28, 28 are provided between the two. Installing. Needle bearing 2
Numeral 8 contributes to enabling the lubricant supply pipe 27 to be displaced within a certain range in the front-rear direction f1, f2.

The tool holder 8 includes a tapered shank 8a, a flange 8b, and a chuck 8c.
a is inserted into the tapered hole 3 a of the main shaft 3.

The tapered shank portion 8a has a pull stud 29 at the rear end thereof which is locked by the clamp member 13, and the flange portion 8b has a recess m which the automatic tool changing device grips when the tool is changed. It is formed, and the chuck portion 8c is for fixing the cutting tool 30.

The tool holder 8 has a center hole 27
is formed, an inner fitting member 31 is provided in the middle of the length of the center hole 27a, and the center hole of the inner fitting member 31 and the center hole of the pull stud 29 are connected by a communication pipe 32.

The type of the cutting tool 30 is not limited, such as a drill, a reamer, a tap, or a milling, but it is necessary that the cutting tool 30 be provided with a passage 30a extending from the rear end to the front end.

Reference numeral 33 denotes a cutting fluid atomizing device for generating a mist of cutting fluid.
a, a pressure adjusting device 33b, an atomizing device 33c, and a cutting fluid delivery pipe 35. The cutting fluid delivery pipe 35 is a hose 3
6, and connected to the connecting member 26 through the conduit 37 to communicate with the inside of the cutting agent supply pipe 27.

An example of the use and operation of the spindle device configured as described above will be described below.

That is, when the tool holder 8 mounted as shown in FIGS. 1 and 2 is removed from the main shaft 3, after the automatic tool changer (not shown) grasps the flange 8b of the tool holder 8, the Is supplied with pressure fluid. As a result, the piston 19 is moved forward f1 by a spring s (not shown).
When the amount of displacement exceeds a certain amount, the locking ring plate 16 and the end face cover member 15 are pressed against each other, and the front end of the threaded pipe member 19 is moved to the draw bar 1.
0, and the drawbar 10 is displaced forward f1 against the elasticity of the disc spring 11.

The forward displacement of the draw bar 10 is determined by the holding cylinder member 1.
2 and the clamp member 13 are displaced forward f1. When the displacement becomes equal to or larger than a predetermined value, the distal end of the clamp member 13 is disengaged from the projection on the inner peripheral surface of the holding cylinder member 12 and moves outward in the radial direction of the holding cylinder member 12. Can be displaced.

In this state, the automatic tool changer applies a pulling force to the tool holder 8 to the front f1. At this time, the pull stud 29 is hooked on the clamp member 13 in a state where the clamp member 13 can be released. Therefore, the tool holder 8 is pulled out from the main shaft 3 because the tool holder 8 comes out from the inside of the clamp member 13.

On the other hand, when the tool holder 8 is mounted on the main spindle 3, the draw bar 10 is held in the same state as when the tool holder 8 is removed from the main spindle 3, and in this state, the automatic tool changer operates the tool holder 8 The tapered shank 8a is inserted into the tapered hole 3a of the main shaft 3. At this time, the pull stud 29 is inserted into the clamp member 13 without being hooked because the clamp member 13 is in the release operable state.

In connection with the end of this insertion, the cylinder chamber 22
The pressure fluid inside is discharged, and the pressure fluid is supplied into the other cylinder chamber 23. As a result, the piston 19 is displaced rearward, the threaded pipe member 21 is separated from the draw bar 10, and the draw bar 10 retreats to the original position shown in FIG.

Due to the retreat, the clamp member 13 is pressed by the projection on the inner peripheral surface of the guide cylinder member 9 at the outer periphery of the leading end, and the diameter thereof is reduced.
The projection at the tip of the inner peripheral surface is locked by the narrow portion of the pull stud 29, and the pull stud 29 is further pulled by the elasticity of the disc spring 11. As a result, the tool holder 8 is tightly fitted on the main shaft 3. In this fitted state, the gap between the rear end of the pull stud 29 and the front end of the cutting agent supply pipe 27 is generally about 0.5 to 1 mm. After this,
The automatic tool changer separates the tool holder 8 and retracts.

When processing the work w, rotation is input to the pulley 14 from a motor (not shown). Thus, the main shaft 3 rotates while being guided by the bearings 4a and 4b. At this time,
Cylinder member 17 and piston 19 are supported frame 2
4 does not rotate because it is supported by the cylinder plate 23, and when the pressurized fluid is supplied into the cylinder chamber 23, the locking plate member 1
6 is displaced to the front f1 by the elastic force of the spring s and is separated from the end face cover member 15, and does not impart rotational resistance to the main shaft 3. Further, the piston 19 is also separated from the end face cover member 15 and does not hinder the rotation of the main shaft 3.

On the other hand, the cutting agent supply pipe 27 is
Because the main shaft 3 is fixed to the same body, the main shaft 3 is kept in a non-rotation state irrespective of the rotation of the main shaft 3.

Under this condition, compressed air is supplied to the cutting fluid atomizing device 33. As a result, a mist-like cutting fluid is generated by the spraying principle and supplied to the rear end of the cutting agent supply pipe 27. The mist cutting fluid supplied in this manner is supplied to the cutting agent supply pipe 1.
2 from the front end of the cutting tool 30, reaches the rear end of the cutting tool 30 through the passage in the center of the tool holder 8, and further passes through the passage 3 of the cutting tool 30.
It is ejected from the tip through 0a.

At this time, the inside of the cutting agent supply pipe 27 is moved forward f1.
The mist-like cutting fluid flowing to the tool holder 8 is not affected by the centrifugal force due to the rotation of the spindle 3, and is guided to the vicinity of the tool holder 8 without causing component separation or liquefaction due to a difference in specific gravity of the cutting fluid component. It is ejected from the tip of the cutting tool 30 in a uniform distribution state.

The mist cutting fluid ejected from the tip of the cutting agent supply pipe 27 tends to flow backward along the outer peripheral surface of the cutting agent supply pipe 27, but the flow is restricted at the point 10 a of the enlarged end portion of the draw bar 10. Is done.

In this state, the spindle device is displaced with respect to the work w to perform required machining. At this time, even if the tip of the cutting tool 30 is in a state of processing a relatively deep position of the work w, the cutting tool 30 is evenly and effectively lubricated and performs accurate processing.

Next, a second embodiment of the present invention will be described. FIG. 3 is a sectional view showing a spindle device according to the present embodiment. In the drawing, substantially the same parts as those in the previous embodiment are denoted by the same reference numerals.

As shown in FIG. 3, the tool holder 8 is
A bolt 30 is fixed to the tip of the blade, and a cutting tool 30 is fixed to the tip by screwing.

The cutting agent supply pipe 27 is located in the center hole 3b of the main shaft 3 as in the previous embodiment, but the bearings 28, 28 for guiding the front and rear portions thereof are cut. Since it is not necessary to consider the axial displacement of the agent supply pipe 27, a ball bearing is used.

Since the automatic attachment / detachment of the tool holder 8 by the automatic tool changer is not taken into consideration, the cylinder member 17 and the piston 19 are not provided.

The front end of the cutting agent supply pipe 27 is desirably located in the center hole 27a of the tool holder 8 and the center hole 3
A cover member 38 for closing the space between b and the cutting agent supply pipe 27 is fixed by bolts. At this time, the cutting agent supply pipe 27 penetrates the center of the cover member 38 in a rotatable and gas-tight manner.

In the spindle device of this embodiment, the tools are changed manually. When processing the work w, rotation is input via the pulley 14, whereby the main shaft 3, the tool holder 8, the cutting tool 30, the cover member 38, and the like are rotated. On the other hand, the cutting agent supply pipe 27 is kept in a non-rotating state.

Thereafter, similarly to the above, the cutting fluid atomizing device 33 is used.
The mist-like cutting fluid is supplied into the cutting agent supply pipe 27 from, and processing of the work w is performed.

Also in this embodiment, since the cutting agent supply pipe 27 does not rotate, the mist-like cutting liquid supplied through the pipe is used to cut the tip of the cutting tool 30 for processing a relatively deep position of the work w in the same manner as above. It will effectively lubricate.

[0048]

According to the present invention constructed as described above, the tip portion of a cutting tool for machining a relatively deep portion by relatively simple means of providing a cutting agent supply pipe in the main shaft in a non-rotating state. Can be uniformly, reliably and stably lubricated with a mist-like cutting fluid.

Here, the provision of the cutting agent supply pipe in a non-rotating state simplifies the structure such that the rotary joint used for supplying the fluid from the fixed side to the rotating main spindle side becomes unnecessary. This will contribute to achieving

[Brief description of the drawings]

FIG. 1 is a sectional view showing a spindle device according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the spindle device.

FIG. 3 is a sectional view showing a spindle device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 spindle 3b center hole 8 tool holder 27 cutting agent supply pipe 30 cutting tool

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[Procedure amendment]

[Submission date] January 25, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

[Title of the Invention] Spindle device of machine tool with automatic tool changer

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle device improved so as to be particularly suitable for lubrication of a tip of a cutting tool for machining a deep part in a machine tool with an automatic tool changer.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art In a machine tool with an automatic tool changer,
A large amount of cutting oil is supplied to the machined part to cool and lubricate the workpiece and the cutting tool, or to remove chips, but this may cause environmental pollution, adverse effects on human health, and cutting oil. In addition to the large cost associated with waste oil treatment, the cutting tool life is shortened due to overcooling of the workpiece, and there is a problem such as sliding wear during fine cutting of the cutting tool due to excessive cutting oil, and a large amount of cutting oil Because of the adhesion, it is necessary to separate the cutting oil adhering to the chips when processing and reusing the chips.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

The above-mentioned Patent No. 26871
According to the spindle device of No. 10, mist-like cutting oil can be supplied very effectively to the tip of a cutting tool for processing a relatively deep portion of a workpiece. Depending on the case, the cost may be too high. An object of the present invention is to provide a spindle device of a machine tool with an automatic tool changer capable of coping with such a situation.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

In order to achieve the above object, in a machine tool with an automatic tool changer according to the present invention, a taper of a tool holder is provided at a center of a tip end of a spindle which is rotatably supported by a support frame. An outwardly expanding tapered hole for fitting the shank portion therein is created, and a straight center hole is formed in the longitudinal direction of the main shaft continuously with the tapered hole, and a front end is formed in the center hole. A draw bar for holding and releasing the pull stud of the tool holder is built in, and a straight hole is formed in the center of the draw bar in a length direction, and a main shaft is rotated in the hole. Inserting a cutting agent supply pipe that is held even in a non-rotating state, supplying mist cutting fluid from the outer end of the spindle to the cutting agent supply pipe, and spraying mist cutting fluid from the tip of the cutting tool. I do.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described. FIG. 1 is a sectional view showing a spindle device with an automatic tool changer according to the present embodiment, and FIG. 2 is a partially enlarged sectional view of the spindle device. FIG.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

[0040]

According to the machine tool with an automatic tool changer of the present invention constructed as described above, a relatively deep portion can be formed by a relatively simple means of providing a non-rotating cutting agent supply pipe in the main spindle. The tip of the cutting tool being machined can be evenly, reliably and stably lubricated with the mist-like cutting fluid.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

The fact that the cutting agent supply pipe is provided in a non-rotating state means that the rotary joint used for supplying the fluid from the fixed side to the rotating main spindle side becomes unnecessary, and the structure is simplified. This will contribute to achieving

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Deleted

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Deleted

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Deleted

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0045

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[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0046

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[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Deleted

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Deleted

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Deleted

[Procedure amendment 18]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a spindle device according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the spindle device.

[Description of Signs] 3 Main shaft 3b Center hole 8 Tool holder 27 Cutting agent supply pipe 30 Cutting tool

[Procedure amendment 19]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Deleted

Claims (1)

[Claims] An axial hole extending from the outer end of the main shaft toward the front end portion is formed in a center portion of the main shaft having a tool holder and a cutting tool at a front end thereof. A machine tool characterized in that a cutting agent supply pipe held in a state is inserted, a mist cutting liquid is supplied from the outer end of the main shaft to the cutting agent supply pipe, and the mist cutting liquid is ejected from the tip of the cutting tool. Spindle device.