JP2003225806A - Frame structure for compound nc lathe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a frame structure with a guide rail arrangement structure wherein the rigidity of guide rails slidably supporting a compound tool rest is easy to secure and position control is easy in regard to a machine tool such as a compound NC lathe. <P>SOLUTION: In the NC lathe with the slanted frame structure, turret tool rest guide rails 30a and 30b for horizontally sliding a turret tool rest 3 are arranged in operator lower near sides of two parallel headstock guide rails 20a and 20b for horizontally (in a Z-axis direction) sliding a headstock 2R. Of two parallel compound tool rest guide rails 40a and 40b for horizontally sliding a compound tool rest 4 arranged in an upper far side, one guide rail 40a is arranged adjacently to the upper far side headstock guide rail 20b, and the other guide rail 40b is arranged nearer to a frame rear face lower than the one guide rail 40a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure effective for improving the rigidity of a guide rail for slidingly supporting a tool rest in a machine tool such as a compound NC lathe.

[0002]

2. Description of the Related Art A conventional frame structure of a composite NC lathe of this type will be described below with reference to FIG. A left headstock 2L and a right headstock 2R, which are opposed to each other on the same axis, are provided at a substantially central portion of the base 101. The right headstock 2R is slidably arranged in the left and right directions in the Z-axis, and a turret tool post 3 is slidably arranged in a lower position on the front side as seen from the operator, and the turret toolstock 3 is opposed to the opposed two spindles. The composite tool post 104 is disposed on the upper back side so that the B axis can be controlled. Here, the bed 101 is a slant type which is inclined at an angle of 30 to 45 degrees in a direction closer to the front as seen from the operator. Further, the composite tool rest located above the back side of the main shaft is provided with two guide rails 140a and 140b so as to be movable and adjustable in the Z-axis direction.

However, these two guide rails 140
Since a and 140b are configured to be horizontal guide planes, they have the following technical problems.
As shown in FIG. 3, the compound tool post has front and rear guide rails 141 so that two parallel compound tool posts can be moved back and forth in a direction perpendicular to the horizontal plane formed by the guide rails. In addition, the structure is provided with a feed base 142 so that the tool can move along the slant surface. Therefore, in order to prevent interference between the front and rear guide rails 141 and the like for guiding the composite tool rest 104 in the front-rear direction and the headstock guide rail 20b and the like, one guide rail 140a on the front side of the composite tool post guide rail is used. It is necessary to leave a predetermined space between the headstock guide rails 20b. Then, the disposition distance of the compound tool post guide rail with respect to the center of the spindle must be unavoidable.
A large moment is applied when machining a workpiece such as cutting. Therefore, the composite tool post guide rail 140
It was difficult to secure the rigidity of a and 140b.

Further, since the compound tool post is a feed table which moves along the slant surface (X-axis direction), the compound tool post moves back and forth in a substantially horizontal front and rear guide rail and the feed table described above. And are configured to form a triangle when viewed from the side. Therefore, when the position of the Y-axis direction is controlled by moving the compound tool post in the horizontal direction substantially back and forth, it is necessary to control the position in the Y-axis direction while considering the correction of the displacement in the X-axis direction. It was necessary to move the compound turret in the front-back direction more than the displacement of. That is, there is a technical problem that the sliding structure of the compound tool post becomes larger and more complicated.

[0005]

SUMMARY OF THE INVENTION In view of the technical problems inherent in the above prior art, the present invention ensures the rigidity of the guide rails for slidably supporting the composite tool post in machine tools such as composite NC lathes. It is an object of the present invention to provide a frame structure having a guide rail arrangement structure that is easy and easy to control the position.

[0006]

The invention according to claim 1 is
The turret tool post guide rails 30a, 30b on which the turret tool post 3 slides left and right are arranged on the operator's lower side of the two parallel head stock guide guide rails 20a, 20b on which the headstock 2R slides left and right (Z axis direction). In the NC lathe having the slant type frame structure provided, the compound tool post 4 disposed on the upper back side has one guide rail 40a among two parallel compound tool post guide rails 40a, 40b that slide left and right. Is disposed in the vicinity of the rear upper headstock guide rail 20b, and the other guide rail 40b is disposed below the one guide rail 40a on the rear side of the frame.

As described above, of the two compound tool post guide rails 40a, 40b that slidably support the compound tool post 4 disposed above the back side of the spindle, the compound tool post guide rail 40a in front of Back 20 of the headstock guide rail
Installed close to b, the compound tool post guide rail 4 on the back side
0b is arranged below the rear surface side so as to be lower than the front side composite tool post guide rail 40a, so that the slide surface formed by the two headstock guide rails 20a and 20b and the two composite tool post guide rails. The slide surfaces formed by 40a and 40b form a triangular shape. Therefore, the composite tool post guide rail can be arranged closer to the center of the spindle as compared with the conventional structure, so that the moment applied to the composite tool post guide rail during cutting is reduced.

According to a second aspect of the present invention, for the purpose of facilitating the position control of the compound tool rest, the compound tool rest 4 disposed above the back of the headstock is provided with Y-axis direction movement control means. Prepared

As described above, since the composite tool post guide rails are arranged so as to incline so that the rear side is downward, the slide surface formed by the two composite tool post guide rails is slanted in the X-axis direction. It becomes easier to place it at a right angle to the plane, and when controlling the displacement of the compound tool post in the Y-axis direction, X
It acts so as to reduce the axial displacement vector component.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a composite NC lathe having a guide rail arrangement structure to which the present invention is applied, and FIG. 2 is a side view of the guide rails. A left headstock 2L and a right headstock 2R that are opposed to each other on the same axis are provided in the center of the base 1. Here, left headstock 2L
Is substantially fixed, and the two right headstocks 2R are arranged so as to be slidable in the left-right direction (Z-axis direction) via the guide rails 20a and 20b. In addition,
The feed screw for driving the slide and the drive motor are not shown. Workpiece chucks 21R and 21L are respectively attached to the spindle headstocks 2R and 2L by spindle motors 22R and 22L.
It is rotatably installed.

The bed 1 is constructed such that the front side of the operator is low and the slant is a slant type having an inclination of 30 to 45 degrees. The turret tool post 3 is disposed slidably in the left-right direction (Z-axis direction) at a position on the lower side of the front side via two parallel turret tool post guide rails 30a and 30b. A tool turret 31 is attached to the turret tool post 3.

On the other hand, on the back side of the spindle as seen from the operator, the back guide rail 20b of the right headstock guide rail is provided.
1 compound turret guide rail 40a is arranged in the vicinity of, and the 1 compound turret guide rail 40a is provided on the back side thereof.
The other compound tool post guide rail 40b is arranged at a lower position, and the compound tool post 4 is slidable in the left-right direction on the guide surface of the compound tool post guide rail which is formed at the lower rear of the compound tool post guide rail 40b. . As shown in FIG. 1, the compound tool rest 4 is provided with a tool spindle 5 on which a tool 6 is installed so that the Y-axis direction, the X-axis direction and the B-axis rotation can be controlled.
A tool turret or the like may be attached to this combined tool post.

[0013]

According to the present invention, the two parallel headstock guide rail slide surfaces for slidably supporting the headstock and the two compound tool post guide rail slide surfaces arranged on the back side thereof have a triangular shape. Since it is configured, it is possible to dispose the headstock guide rail and the compound tool post guide rail on the mountaintop side in close proximity to each other. Therefore, when performing cutting, etc. using the tool attached to the compound turret, the moment applied to the guide rail becomes smaller than before due to the fact that this compound turret guide rail can be placed near the spindle. It becomes easier to ensure the rigidity of the tool post guide rail. Further, since the slide surface of the compound tool rest can be formed in a direction substantially perpendicular to the X axis direction of the slant surface, the Y axis direction displacement adjustment stroke of the compound tool rest provided on this slide surface can be shortened.

[Brief description of drawings]

FIG. 1 shows an example of an NC lathe to which an arrangement structure of guide rails according to the present invention is applied.

FIG. 2 shows a side view of the guide rail arrangement.

FIG. 3 shows an example of a conventional guide rail arrangement (frame) structure.

[Explanation of symbols]

1 base 2L left headstock 2R right headstock 21L left side chuck 21R right side chuck 22L left side spindle motor 22R right side spindle motor 20a, 20b headstock guide rail 3 turret tool post 31 tool turret 30a, 30b turret tool post guide rail 4 compound tool post 41 Feed platform 40a, 40b Compound tool post guide rail 5 Tool spindle 6 Tool

Claims (2)

[Claims] 1. Two parallel headstock guide rails (20a, 20) in which a headstock (2R) slides left and right (Z-axis direction).
The turret tool post guide rail (30) on which the turret tool post (3) slides left and right is provided on the lower side of the operator in (b).
slant type frame structure N in which a, 30b) are arranged
In the C lathe, the compound tool post (4) disposed on the upper back side has one guide rail (40a) among the two parallel compound tool post guide rails (40a, 40b) that slide left and right. Back side upper headstock guide rail (20
A frame structure of a composite NC lathe, characterized in that the guide rail (40b) is arranged in the vicinity of b) and the other guide rail (40b) is arranged below the one guide rail (40a) on the rear side of the frame. 2. A compound NC lathe having a frame structure according to claim 1, wherein a compound tool rest (4) arranged above and behind the headstock is provided with Y-axis direction movement control means. .