JP2002059338A - Tool divider of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool divider of a machine tool capable of preventing any effect on the machining accuracy caused by the thermal displacement by removing heat generation from a rotating mechanism. SOLUTION: In this tool divider of the machine tool in which a tool rest body 27 with a tool T1 fitted thereto is supported by a support base 25 via a worm mechanism (rotating mechanism) 34 in a dividing manner to the predetermined angular position, cooling fluid distribution passages 48, 49 and 50 are formed so as to surround a storage recess 25a with the worm mechanism 34 stored in the support base 25 and an insertion hole 25b, and cooling fluid is fed to the cooling fluid distribution passages 48-50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool indexing device for a machine tool in which a tool rest body on which a tool is mounted is rotatably indexed by a support base.

[0002]

2. Description of the Related Art For example, in a combined machining lathe capable of performing both a turning tool machining and a rotary tool machining, a tool rest body on which a tool is detachably mounted is fixed to a predetermined position by a support base via a rotation drive mechanism. It is configured to be rotatably indexed at an angular position.

[0003]

However, in the above-mentioned conventional tool indexing device, heat displacement may occur due to heat generated from the rotary drive mechanism, and in some cases, machining accuracy may be affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and provides a tool indexing device for a machine tool capable of preventing the influence of thermal displacement on machining accuracy by removing heat from a rotary drive mechanism. It is an object.

[0005]

According to the present invention, there is provided a tool indexing apparatus for a machine tool, wherein a tool rest body on which a tool is mounted is indexably supported at a predetermined angular position by a support base via a rotary drive mechanism. A coolant passage is formed in the support base so as to surround the rotary drive mechanism, and the coolant is supplied to the coolant passage.

[0006]

According to the tool indexing device of the present invention, the coolant passage is formed in the support base of the tool post so as to surround the rotary drive mechanism, and the coolant is supplied to the coolant passage. Heat generated from the rotary drive mechanism can be removed, and the influence of thermal displacement on processing accuracy can be prevented.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 6 are views for explaining a machine tool (composite machining lathe) according to an embodiment of the present invention. FIG. 1 is a perspective view of the composite machining lathe, and FIG. 3 and 4 are side and perspective views of a second tool post of the combined lathe, FIG. 5 is a schematic perspective view showing a coolant passage of a support base of the second tool post, and FIG. 6 is a second tool. It is a side view of the belt drive mechanism of a stand.

In the drawing, reference numeral 1 denotes a combined machining lathe, which is provided with a first headstock 3 at the left end in the longitudinal direction of the fixed bed 2 and a right end at the right end when viewed from the front of the machine. A second headstock 4 is provided, and the first and second headstocks 3 and 4 are provided.
The first and second tool rests 5 and 6 are arranged between them.

The fixed bed 2 has a front inclined surface 2 in side view.
a and a rear inclined surface 2b. The first and second headstocks 3 and 4 and the first
The tool post 5 is linearly arranged, and the rear inclined surface 2b is provided.
The second tool rest 6 is arranged at the second position.

On the rear inclined surface 2b of the fixed bed 2, 2
The guide rails 8, 8 are laid in parallel, and a column 7 is mounted on the guide rails 8, 8 so as to be movable in the Z-axis direction (left and right directions as viewed from the front of the machine). This column 7
The second tool rest 6 is mounted on the front downward inclined surface 7a so as to be movable in the X-axis direction (the front-rear direction when viewed from the front of the machine).

Two guide rails 9, 9 are laid on the front inclined surface 2a of the fixed bed 2, and a headstock base 10 is mounted on the guide rails 9, 9 so as to be movable in the Z-axis direction. ing. On the headstock base 10, the second
The headstock 4 is fixed. The second headstock 4 includes a main shaft 4a rotatably supporting a second main shaft 12 on which a chuck 11 for gripping a work is mounted, and a base 4b extending downward following the main shaft 4a. , This base part 4b
Is inclined so as to be parallel to the front inclined surface 2a, whereby the second headstock 4 is perpendicular to the front inclined surface 2a.

The guide rails 9 on the front inclined surface 2a,
A saddle 15 is mounted on the saddle 9 so as to be movable in the Z-axis direction, and the first tool rest 5 is mounted on the saddle 15 so as to be movable in the X-axis direction. The first tool rest 5 has a tool rest body 16 movably supported by the saddle 15 and a turret mounted on the right side surface (the other end side face) of the tool rest body 16 toward the second headstock 4 side. 17 are provided.

The turret 17 supports a turret head 18 on which a plurality of tools T are mounted at a predetermined interval on the outer peripheral portion so as to be rotatable and indexable by a rotary indexing table 19. The rotary indexing position is determined at a predetermined processing position, and the rotation position is clamped at the processing position.

The first headstock 3 includes a main shaft portion 3a rotatably supporting a first main shaft 21 on which a chuck 20 for gripping a work is mounted, and a base portion 3b extending downward following the main shaft portion 3a. The base 3b is fixed bed 2
It is fixed to. The base part 3b is provided on the front inclined surface 2a.
Is formed to be wide from the upper edge to the lower edge, and straddles the guide rails 9 and 9.

The main spindle 3a of the first headstock 3 has a base 3
b is overhang on the second headstock 4 side by the illustrated dimension L. The overhang portion is integrally formed with a leg 3d, and the leg 3d is fixed to the upper edge of the fixed bed 2. The support rigidity of the overhang portion of the main shaft 3a is ensured by the legs 3d. In this way, the overhang portion of the main shaft portion 3a, the right end face 3c of the base portion 3b, and the leg portion 3d form the accommodation portion a having a size in which the saddle 15 and the tool rest body 16 can enter. .

The second tool rest 6 is supported on the support base 25 movably in the X-axis direction by the column 7, and is rotated on the support base 25 via a tool indexing device 26 about a pivot axis A. And a tool rest main body 27 supported so as to be indexable and clampable.

A tool spindle 28 for removably holding the tool T1 is rotatably inserted into the tool rest main body 27. The tool spindle 28 is driven to rotate by a belt drive mechanism 30. As shown in FIG. 6, the belt drive mechanism 30 includes a tool spindle drive motor 60 disposed at the rear end of the support base 25 and a spiral bevel gear 61, 62 disposed on the tool spindle 28, and a timing belt. 63. This timing belt 6
Reference numeral 3 winds a drive pulley 64 attached to a drive shaft 60a of a tool spindle drive motor 60 and a driven pulley 65 attached to a rotation shaft 62a of the spiral bevel gear 62.

The tool indexing device 26 includes a turntable 32 fixed to the tool rest main body 27, and a fixed stand 33 disposed coaxially with the turntable 32 and fixed to the support base 25. A worm mechanism 34 for driving the rotary table 32 to rotate to a predetermined index angle position, and a coupling mechanism 35 for fixing the rotary table 32 to the index angle position of the fixed table 33.

The coupling mechanism 35 includes a rotary table 32
And a fixed coupling 37 disposed coaxially inside the rotary coupling 36 and fixed to the support base 25, and meshing with the couplings 36, 37. The coupling coupling 38 is provided so as to be able to move up and down between an engagement position and an engagement release position for releasing the engagement.

The worm mechanism 34 includes a worm wheel 40 fixed to the rotation-side coupling 36 and a worm gear 41 connected to a rotation drive motor (not shown). It is in mesh with 40.

In the tool indexing device 26, the coupling 38 rises to release the engagement between the rotating coupling 36 and the fixed coupling 37. In this state, the rotation of the rotary drive motor is transmitted from the worm gear 41 to the turntable 32 via the worm wheel 40 and the rotation-side coupling 36, whereby the tool rest main body 27 is indexed to a predetermined rotation angle. Then, the coupling 38 descends and engages with the couplings 36 and 37 to clamp the tool rest main body 27 at the rotation angle.

As shown in FIG. 5, the support base 25 is in the shape of a rectangular plate, and a storage recess 25a for storing the worm wheel 40 is formed at the front end thereof. An insertion hole 25b extending in the X-axis direction is formed on the side of the storage recess 25a of the support base 25, and the worm gear 41 is inserted and arranged in the insertion hole 25b. A window 25c is formed in the storage recess 25a, and the gear portion 41a of the worm gear 41 meshes with the worm wheel 40 via the window 25c. Further, a belt recess 25d extending in the X-axis direction is formed in the support base 25, and the timing belt 63 and the respective pulleys 64 and 65 are accommodated in the belt recess 25d.

The support base 25 has a coolant passage formed therein. This coolant passage is provided on the support base 25.
The holes are formed by making holes corresponding to the passages so as to communicate with each other, and closing the outer end openings of the holes with plugs or the like. The coolant passage is configured such that a coolant supply passage 45 to which an oil cooler supply source (not shown) is connected and a coolant discharge passage 46 for discharging the coolant to the outside are connected by a coolant flow passage 47. I have.

The coolant supply passage 45 is formed below and along the outside of the belt recess 25d, and the coolant discharge passage 46 is formed below and along the outside of the insertion hole 25b. Is formed.

The cooling liquid flow passage 47 has four first flow passages 48 formed so as to surround the central portion of the belt recess 25d and four coolant flow passages formed along the outer periphery of the insertion hole 25b. Of the storage recess 25
and a single third circulation passage 50 formed so as to surround the outer peripheral portion of FIG.

The upstream end of each of the first flow passages 48 is connected to the coolant supply passage 45, and the downstream end is connected to a drain header 51.
a. The drain header 51a is connected from the feed passage 51b to the water supply header 51c, the upstream end of the second circulation passage 49 is connected to the water supply header 51c, and the downstream end of the second circulation passage 49 is connected to the coolant discharge passage. 46. The upstream end of the third flow passage 50 is connected to the coolant supply passage 45, and the downstream end is connected to the coolant discharge passage 46.

Next, the operation and effect of this embodiment will be described.

The combined machining lathe 1 of the present embodiment includes a first tool rest 5 and a work held by the chuck 20 of the first headstock 3.
While the predetermined work is performed by the tool T, the work held by the chuck 11 of the second headstock 4 is subjected to the predetermined work by the tool of the second tool rest 6. In this case, machining is performed with the tool T of the turret 17 in a state where the saddle 15 of the first tool rest 5 and the tool rest main body 16 enter the accommodating portion a of the first headstock 3.

According to this embodiment, since the turret 17 of the first tool rest 5 is arranged toward the second headstock 4 side, the fixed bed 2 and thus the entire machine are not enlarged.
When the work held by the chuck 20 of the first headstock 3 is processed by the tool of the turret 17, it is possible to avoid interference between the tool rest body 16 and the second headstock 4.

The spindle 3a of the first headstock 3 is connected to the base 3
Since the housing portion a is formed by the main spindle portion 3a and the base portion 3b by overhanging from the side b to the second headstock 4 side, the saddle 15 and the tool rest body 16 enter the housing portion a. The work can be processed, and the work of the chuck 20 can be processed without any trouble while the turret 17 is arranged on the second headstock 4 side. As a result, the size of the machine can be prevented from being increased, and a decrease in support rigidity when the second headstock is overhanged can be avoided, and a decrease in machining accuracy can be prevented.

Since the main shaft portion 3a of the first headstock 3 fixed to the fixed bed 2 is overhanged and the overhang portion is connected and fixed to the bed 2 by the leg portion 3d, the accommodating portion a is formed. The support rigidity of the first headstock 3 can be ensured while providing the accommodation portion a in the first headstock 3.

Further, since the base portion 3b of the first headstock 3 is formed wide so as to extend over the lower front edge 2a of the fixed bed 2, the main shaft portion 3a is also overhanged from this point. In this case, a decrease in support rigidity can be avoided.

According to the present embodiment, the belt recess 25 d for accommodating the timing belt 63 and the insertion hole 2 for the worm gear 41 to be inserted into the support base 25 of the second tool rest 6.
5b and the first, second, and third flow passages 48, 4 so as to surround the storage recess 25a in which the worm wheel 40 is stored.
Since the cooling fluid is supplied into each of the circulation passages 48 to 50, heat generated in the driving system such as the driving belt and the gear can be removed, and the influence of thermal displacement on the processing accuracy can be avoided. .

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a combined machining lathe according to an embodiment of the present invention.

FIG. 2 is a side view of the combined machining lathe.

FIG. 3 is a side view of a second tool rest of the combined machining lathe.

FIG. 4 is a perspective view of the second tool rest.

FIG. 5 is a schematic perspective view showing a coolant passage of a support base of the second tool rest.

FIG. 6 is a side view of a belt driving mechanism of the second tool rest.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 combined machining lathe (machine tool) 6 second turret 25 support base 26 tool rotation indexing device 27 turret main body 30 belt drive mechanism (rotation drive mechanism) 34 worm mechanism (rotation drive mechanism) 47 coolant passage 48, 49 , 50 First to third communication passages (coolant passages) T1 tool

Claims (1)

[Claims] 1. A tool indexing device for a machine tool in which a tool rest main body on which a tool is mounted is supported by a support base so as to be indexable at a predetermined angular position via a rotary drive mechanism, wherein the rotary drive mechanism is provided in the support base. A coolant passage is formed so as to surround the coolant passage, and coolant is supplied to the coolant passage.