JPH08192302A - Multispindle lathe - Google Patents

Abstract

PURPOSE: To easily arrange an NC type tool post between a cam type tool post and a can shaft in a multispindle lathe provided with a rotational spindle carrier holding plural main spindles. CONSTITUTION: An intermediate shaft 53, which is arranged in a link mechanism 17 controlling a cam type tool post 4 by means of the rotation of a cam shaft 15, is provided with a hollow structure, in which an NC type tool post 30 is arranged, while a Z-axis screw shaft 34 for moving a Z-axis slide 33 is arranged inside the hollow intermediate shaft 53, so that the NC type tool post 30 can be arranged without interfering with the link mechanism 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-spindle lathe having a plurality of work holding spindles.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an automatic lathe for efficiently performing a plurality of machining operations on the same work is arranged so that a plurality of work holding spindles are located on the same circle on a spindle carrier 1. (Hereafter referred to simply as the spindle) 2
Are held at a constant pitch, and the tool table is made to correspond to each spindle 2 at a work processing position (hereinafter simply referred to as a position) P1, P2, P3, P4, P5, P6 where each spindle 2 is positioned when the spindle carrier 1 is stopped. 3, 4, 5, 6, 7, 8 are provided, and the spindle carrier 1 is indexed and rotated so that each spindle 2 moves intermittently between a plurality of workpiece processing positions P1 to P6, and is held by the spindle 2. There is known a multi-spindle lathe configured to perform predetermined machining with the corresponding tool bases 3 to 8 when the workpiece W stops at each workpiece processing position.

Generally, in this type of multi-spindle lathe, each tool base 3
8 is a tool 9 that holds a cross slide 11 that holds a tool holder 10 for mounting the tool 9, respectively.
Is configured to move in a direction perpendicular to the main shaft 2. The mechanism for moving the cross slide 11 includes a rack 12 provided on the cross slide 11 in the cross direction.
And a slide drive lever shaft 14 holding a pinion gear 13 meshing with the slide drive lever shaft 14. The cross slide 11 can be reciprocated by reciprocal rotation of the slide drive lever shaft 14. Then, as a means for reciprocally rotating the slide drive lever shaft 14 of each tool base 3 to 8, a cam shaft 15 provided with a cam corresponding to each tool base 3 to 8 arranged above the spindle carrier 1 and its cam. There is provided a cam type drive device including a link mechanism that reciprocally rotates the slide drive lever shaft 14 of each tool base 3 to 8 by the rotation of the shaft 15. As described above, these tool bases 3 to 8 are cam type tool bases controlled by the cam of the cam shaft 15.

By the way, since the link mechanism connecting the cam shaft 15 arranged above the spindle carrier 1 and the tool bases 3 and 4 at the farthest position has a long distance, the length is long with only one lever. Becomes insufficient in rigidity. For this reason, an intermediate shaft is generally provided to divide the lever into a plurality of levers, and in this case, the spindle drive lever shaft 14 of the tool bases 5 and 8 at the positions P3 and P6 is used as the intermediate shaft. That is, as shown in FIGS. 6 and 7, for example, the cam shaft 15
The link mechanism 17 from the slide drive lever shaft 14 of the tool base 4 to the tool base 4 is rotatably held by the support shaft 17a, and is pivoted by the cam 15a attached to the cam shaft 15, and the first lever 17b is connected thereto. Second lever 1
7c, a third lever 17d that is rotatably held by the slide drive lever shaft 14 of the tool base 5 provided at the position P3, and that is connected to the second lever 17c, and that is connected to this third lever 17d. Fourth lever 17e and position P2
Is equipped with a fifth lever 17f fixed to the slide drive lever shaft 14 of the tool base 4 and connected to a fourth lever 17e, and the slide drive lever shaft 14 of the tool base 5 holds the third lever 17d. It acts as an intermediate shaft.

Further, the slide drive lever shaft 1 of the tool base 5
4, the movement of another cam provided on the cam shaft 15 is transmitted via another link mechanism 18. In FIG. 6, 19 is a lathe frame, 20,
21 is the tool stand 5 of the lathe frame 19 (position P3)
Shaft mounting holes 22 and 23 formed at the mounting positions are bearings that are respectively mounted in the shaft mounting holes 20 and 21 and rotatably hold the slide drive lever shaft 14. Further, in FIG. 5, reference numeral 25 denotes a swing stopper provided at the position P6, which is used for abutting the work tip in the main spindle 2 when the work in the main spindle 2 is projected from the front end of the main spindle by a predetermined amount.

[0006]

However, in such a conventional multi-axis lathe, the tool bases 3 to 8 are cam type tool bases,
Since the movement of the cross slide 11 is controlled by the cam, it is necessary to replace the cam every time the condition is changed, which results in poor workability and difficulty in precise and complicated machining. Further, since the tool 9 cannot be fed in the direction parallel to the spindle, the type of machining is limited also from this point, and a tool stand that can be fed in the direction parallel to the spindle is prepared for complicated machining. There was also the problem of having to do it.

In order to solve these drawbacks, a part of the tool stand is fed by NC control using a screw shaft and a servomotor to feed the slide in the X-axis direction orthogonal to the main axis and the Z-axis direction parallel to the main axis. It is conceivable to use the NC type tool stand. However, the tool bases 5 and 8 at the positions P3 or P6 are NC.
If a tool type tool stand is to be used, the mounting positions of the screw shaft and the servomotor interfere with the link mechanism 17 of the cam type drive device to the tool stand 3 and 4 located therebelow, which causes a significant design change. There was a problem of needing it.

The present invention has been made in view of the above problems, and is a multi-spindle lathe capable of arranging an NC type tool stand without interfering with the link mechanism of the cam type drive device for the cam type tool stand. The purpose is to provide.

[0009]

In order to achieve the above-mentioned object, the present invention is located between a cam type tool base located far away from a cam shaft for controlling the cam type tool base and the cam shaft. The tool base was provided with a Z-axis slide for holding the X-axis slide and moving it in a direction parallel to the main shaft, a Z-axis screw shaft for moving the Z-axis slide, and a servomotor for rotationally driving the Z-axis screw shaft. An NC type tool base, and a link mechanism arranged between the cam shaft and the cam type tool base is provided with an intermediate shaft having a hollow structure so as to be located at a mounting position of the NC type tool base. The Z-axis screw shaft is arranged in the shaft.

Here, the mounting position of the intermediate shaft of the hollow structure is the mounting position of the slide drive lever shaft of the cam type tool base when the NC type tool base provided at that position is changed to a cam type tool base. It is preferable that

[0011]

As described above, according to the present invention, the intermediate shaft provided in the link mechanism of the cam type drive device has a hollow structure, and the Z-axis screw shaft of the NC-type tool stand is disposed in the intermediate shaft, whereby the Z-axis screw shaft is provided. Does not interfere with the link mechanism. Therefore, it is possible to easily dispose the NC type tool rest between the cam shaft and the cam type tool rest at a position distant from the cam shaft.

In particular, when the NC type tool base provided at that position is changed to a cam type tool base, the mounting position of the intermediate shaft of the hollow structure becomes the mounting position of the slide drive lever shaft of the cam type tool base. By doing so, it is possible to change the NC type tool stand to a cam type tool stand and vice versa without changing the lathe frame and link mechanism.
It is possible to increase the sharing rate of parts between a multi-spindle lathe equipped with an NC type tool stand and an automatic lathe in which the NC type tool stand is changed to a cam type tool stand.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a schematic front view showing a spindle carrier of a multi-spindle lathe according to an embodiment of the present invention and its vicinity, FIG. 2 is a schematic cross-sectional view showing an NC type tool stand in the multi-spindle lathe and its vicinity, and FIG. Positions P2, P on the multi-axis lathe
3 is a schematic sectional view of the tool stand, and FIG. 4 is a schematic front view showing a cam type drive device for the tool stand at positions P1 and P2 in the multi-axis lathe, the same as or similar to the conventional example shown in FIGS. The same parts are designated by the same reference numerals and the description thereof will be omitted. Also in the multi-spindle lathe of this embodiment, as in the conventional example shown in FIG. 5, the spindle carrier 1 holds a plurality of spindles 2 at a constant pitch so as to be located on the same circle, and the spindle carrier By the indexing rotation mechanism, each spindle 2 is moved to the position P1, P2, P3, P4, P5, P.
Indexing rotation is performed so that 6 is moved intermittently in sequence.

Each of the spindles 2 is located at each of the positions P1 to P6.
A tool stand is provided for performing a predetermined process on the workpiece W held at. In the present embodiment, the positions P1 and P
2, P4 and P5 are cam type tool bases 3,
4, 6, and 7 are provided. Further, in order to reciprocally rotate the slide drive lever shafts 14 of these cam type tool bases 3, 4, 6, 7, the cam type tool bases are provided above the spindle carrier 1 and provided with cams (15a etc.) corresponding to the respective tool bases. There is provided a cam type drive device including a cam shaft 15 and a link mechanism (17 etc.) for reciprocally rotating the slide drive lever shaft 14 of each tool base by the rotation of the cam shaft 15.

NC type tool stands 30 and 31 are provided at positions P3 and P6 in place of the conventional cam type tool stand. Since these NC type tool bases 30 and 31 have the same structure, one NC type tool base 30 will be described. N
The C-type tool rest 30 includes a tool rest frame 32 attached to the lathe frame 19, a Z-axis slide 33 movably held by the tool rest frame 32 in the Z-axis direction parallel to the spindle 2, and a Z-axis direction. The Z-axis screw shaft 34 is rotatably arranged so as to extend in the direction (the mounting position will be described later), the servo motor 35 for rotationally driving the Z-axis screw shaft 34, and the like. A nut 36 fixed to the Z-axis slide 33 meshes with the shaft 34. Thus, by rotating the Z-axis screw shaft 34 with the servo motor 35, the Z-axis slide 33 can be moved in the Z-axis direction. These servo motor 35, Z-axis screw shaft 3
4, the nut 36, and the like constitute a Z-axis slide drive device 37 that moves the Z-axis slide 33 in the Z-axis direction.

The NC type tool base 30 is further provided with a Z-axis slide 3
3 is an X-axis slide 43 held so as to be movable in the X-axis direction.
And an X-axis screw shaft 44 rotatably held on the Z-axis slide 33 so as to extend in the X-axis direction, a servo motor 45 for rotationally driving the X-axis screw shaft 44, and the like.
A nut 46 fixed to the X-axis slide 43 meshes with the X-axis screw shaft 44. Thus, by rotating the X-axis screw shaft 44 with the servomotor 45, the X-axis slide 43 can be moved in the X-axis direction. The servo motor 45, the X-axis screw shaft 44, the nut 46, and the like constitute an X-axis slide drive device 47 that moves the X-axis slide 43 in the X-axis direction.

A tool holder 50 and a tool 9 are attached to the upper surface of the X-axis slide 43. The servo motors 35 and 45 described above are configured to be controlled by an NC device (not shown).
3. It is possible to numerically control the movement of the X-axis slide 43. Thus, the tool 9 is numerically controlled in both the X-axis direction and the Z-axis direction, and the work W held on the spindle 2 is held.
It is possible to perform precise and complicated machining by numerical control.

As can be seen from FIG. 3, N at position P3
At the mounting position of the C-type tool base 30, an intermediate shaft 53 having a hollow structure is provided.
Is provided. This intermediate shaft 53 is a lathe frame 1
It is attached to the shaft attachment holes 20 and 21 formed in 9. Here, the positions and inner diameters of the shaft mounting holes 20 and 21 formed in the lathe frame 19 are the same as those of the conventional lathe frame 19 shown in FIG. 6, and accordingly, the lathe frame 19 shown in FIG. It is substantially the same as the lathe frame 19 used in this embodiment shown in FIG. Further, the outer diameter of the portion of the intermediate shaft 53 excluding the left end portion is the slide drive lever shaft 14 of the cam type tool base 5 at the position P3 shown in FIG.
Is set to be equal to the outer diameter of the corresponding part of the. Thus, as can be seen by comparing FIG. 4 with FIG. 7, the intermediate shaft 53 having the same outer diameter is located at the same position as the slide drive lever shaft 14 arranged at the position P3 in FIG. The intermediate shaft 53 is rotatably attached with a third lever 17d constituting a link mechanism 17 extending from the cam shaft 15 to the slide drive lever shaft 14 of the cam type tool base 4 located below. Therefore, the link mechanism 17 used in this embodiment shown in FIG. 4 is substantially the same as the link mechanism 17 in the conventional device shown in FIG. 7, and has the same shape as the conventional first lever 17b, second lever 17c, The third lever 17d, the fourth lever 17e, the fifth lever 17f, etc. are provided.

Z of the NC type tool base 30 arranged at the position P3
The shaft screw shaft 34 is arranged in the hollow intermediate shaft 53. Accordingly, the Z-axis screw shaft 34 can be arranged without interfering with the link mechanism 17.

As described above, the multi-spindle lathe of this embodiment is
Since the NC type tool bases 30 and 31 are arranged at the positions P3 and P6, and the cam type tool bases 2, 4, 6, and 7 are arranged at the other positions, the spindle carrier 1 is intermittently indexed and rotated, When intermittently moving each spindle 2 to the positions P1 to P6, each position P is attached to the tip of the work W held by each spindle 2.
From 1 to P6, predetermined machining suitable for each tool table is performed one after another. In particular, by arranging the NC type tool stands 30 and 31 at the positions P3 and P6, precise and complicated machining by numerical control is possible.

Further, in manufacturing the multi-spindle lathe,
Lathe frame 19 to be used, cam type tool base 3 at the bottom,
The link mechanism 17 and the like for controlling 4 can be the same as the conventional multi-axis lathe using only the cam type tool stand shown in FIGS. 5 to 7, and can be manufactured at low cost.

In the above embodiment, the intermediate position (position P
Although the two tool rests (3, P6) are NC type tool rests 30 and 31, the present invention is not limited to this configuration, and one may be left as a cam type tool rest, or if necessary, other tool rests may be used. The tool rest may be an NC type tool rest.

[0023]

As described above, according to the present invention, in a multi-spindle lathe equipped with a cam type tool base controlled by rotation of a cam shaft, a cam type tool arranged at a position far from the cam shaft. Since the intermediate shaft provided in the link mechanism for controlling the table has a hollow structure and the Z-axis screw shaft of the NC type tool table is arranged therein, the Z-axis screw shaft interferes with the link mechanism. Therefore, there is no N between the cam shaft and the cam type tool stand located far from the cam shaft.
This has the effect that the C-type tool base can be easily arranged.

As shown in the embodiment, when the mounting position of the intermediate shaft of the hollow structure is changed to the cam type tool base, the slide drive lever of the cam type tool base is changed. When the mounting position is set to, the NC type tool stand can be changed to a cam type tool stand and vice versa without changing the lathe frame or link mechanism. Multi-spindle lathe with N and its N
It is possible to obtain an effect that it is possible to increase the sharing rate of parts with the automatic lathe in which the C-type tool base is changed to the cam-type tool base.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a spindle carrier of a multi-spindle lathe according to an embodiment of the present invention and its vicinity.

FIG. 2 is a schematic sectional view showing an NC type tool stand and its vicinity in the multi-axis lathe.

FIG. 3 is a schematic sectional view of a tool base at positions P2 and P3 on the multi-axis lathe.

FIG. 4 is a schematic front view showing a cam type drive device for the tool rest at positions P1 and P2 in the multi-axis lathe.

FIG. 5 is a schematic front view showing a spindle carrier of a conventional multi-spindle lathe and its vicinity.

6 is a schematic cross-sectional view of a tool base at positions P2 and P3 in the multi-axis lathe shown in FIG.

FIG. 7 is a schematic front view showing a cam type driving device for the tool rests at positions P1 and P2 in the multi-axis lathe shown in FIG.

[Explanation of symbols]

 1 Spindle Carrier 2 Spindle (Spindle for Holding Work) 3-8 Tool Platform (Cam Type Tool Platform) 9 Tool 11 Cross Slide 12 Rack 13 Pinion Gear 14 Slide Drive Lever Shaft 15 Cam Shaft 15a Cam 17 Link Mechanism 19 Lathe Frame 20, 21 Shaft mounting holes 22, 23 Bearings 30, 31 NC type tool stand 32 Tool stand frame 33 Z-axis slide 34 Z-axis screw shaft 35 Servo motor 36 Nut 43 X-axis slide 44 X-axis screw shaft 45 Servo motor 46 Nut 50 Tool holder 53 Middle axis

Claims (1)

[Claims] 1. A spindle carrier that holds a plurality of work-holding spindles on the same circle, and rotates by indexing so that each work-holding spindle moves intermittently between a plurality of work processing positions, and the plurality of work processings. In a multi-axis lathe provided with a tool base having a cross slide for moving a held tool in a direction perpendicular to the spindle, the tool base provided corresponding to the position, among the plurality of tool bases. Some of the tool bases are cam type tool bases equipped with a slide drive lever shaft that reciprocates the cross slide by reciprocating rotation, and a cam shaft and a rotation shaft of the cam shaft are provided outside the spindle carrier. Accordingly, there is provided a cam type drive device including a link mechanism for reciprocally rotating the slide drive lever shaft of the cam type tool base, and further, at a position far away from the cam shaft. At least one of the tool bases located between the cam type tool base and the cam shaft holds the X-axis slide and moves the Z-axis slide in a direction parallel to the main shaft, and the Z-axis slide moves the Z-axis slide. Screw shaft and the Z
An NC type tool base provided with a servomotor for rotationally driving a shaft screw shaft, wherein the link mechanism connected to a cam type tool base at a position far from the cam shaft has an attachment position of the NC type tool base. A multi-spindle lathe having a hollow intermediate shaft, and the Z-axis screw shaft being disposed in the intermediate shaft.