JPH07100241B2 - Opposite turret of machine tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to an opposed tool post that is arranged at a position opposed to a spindle that holds a workpiece in a machine tool.

[Conventional technology]

In numerical control lathes, etc., in order to increase the number of types of machining, a machine tool that has a tool post (hereinafter referred to as "opposite tool post") facing the main spindle that holds the work and performs work end surface machining etc. As a counter tool post, a plurality of tools are attached in parallel to the tool post, and the desired tool is selected by moving the tool post in the direction perpendicular to the spindle axis direction. Those are known (see, for example, JP-A-62-124803). However, as seen in this publication, the conventional opposed tool post is fixed in the axial direction of the spindle, and the work is moved in the axial direction by the spindle for machining feed.

Recently, in order to increase the number of types of machining with tools on the opposing turret, and to enable simultaneous machining with tools held on other tool turrets, a turret body holding multiple tools is mounted on the B-axis slide. Therefore, a system has been developed in which the B-axis slide is moved parallel to the spindle axis direction by NC control.
This type of opposed turret is designed so that the tip of the held tool does not interfere with the work held on the spindle during stand-by, and it is located far away from the end face of the work in order to secure the space necessary for tool replacement. It is located in.

[Problems to be solved by the invention]

However, the facing tool post with such a configuration requires a large amount of movement of the tool post body in the B-axis direction during machining,
There is a problem that the movement stroke by control is required to be long, and accordingly, the guide mechanism and the drive mechanism of the tool post main body are required to be long, which lowers the machining accuracy and prolongs the machining time. To avoid this, the tool tip held on the opposing turret should be brought close to the workpiece end surface.
With such a configuration, the tooling space becomes small, the workability such as tool replacement is impaired, and the chips during machining adhere to the waiting tool.

The present invention is intended to solve such a problem, and an object of the present invention is to provide an opposed tool post of a machine tool capable of reducing a B-axis movement stroke by NC control while securing a tooling space required in front of a spindle. To do.

[Means for solving problems]

The present invention provides a B-axis slide that is located in front of a spindle that holds a workpiece and that is movable in the B-axis direction parallel to the spindle axis, a B-axis drive device that moves the B-axis slide in the B-axis direction, and A tool rest main body held by a B-axis slide so that it can move in the Y-axis direction perpendicular to the B-axis direction, and can move in the B-axis direction at a distance from each other on a straight line in the Y-axis direction on the tool rest main body And a cam mechanism for moving the tool holder in the B-axis direction as the tool rest body moves in the Y-axis direction. The cam mechanism is located on the spindle axis. The gist of the opposed tool post of a machine tool is characterized in that the tool holding shaft to be moved is closer to the main shaft than the tool holding shafts at other positions.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments of the present invention shown in the drawings.

1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a rear end view thereof, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG.
The drawing is a sectional view taken along the line IV-IV in FIG. In these figures, 1 is a workpiece to be machined, which is held by a spindle (not shown). Reference numeral 2 denotes an opposed tool post provided so as to face the main shaft. The opposed turret 2 is, as shown by an arrow B, a B-axis slide 3 movable in the B-axis direction parallel to the main axis, and a B-axis drive device (not shown) for moving the B-axis slide 3 in the B-axis direction. ), The B-axis drive device is controlled by an NC control device (not shown). The B-axis slide 3 has a vertical guide member 4, and the guide member 4 holds a tool rest main body 5 which is movable in the Y-axis direction perpendicular to the B-axis direction as indicated by an arrow Y. Also,
A Y-axis drive device (not shown) for moving the tool rest body 5 in the Y-axis direction is also provided.

The tool rest main body 5 includes a plurality of (three in the illustrated embodiment) tool holding shafts 7 each having a different tool 8a, 8b, 8c attached to the tip thereof, and a sub-shaft 9 for back surface machining of a work. And are held parallel to each other and on a straight line in the Y-axis direction with a space therebetween. Therefore, by moving the tool rest body 5 in the Y-axis direction, it is possible to position the desired tools 8a, 8b, 8c at the work machining position or the auxiliary shaft 9 at the work 1 receiving position.

Each tool holding shaft 7 is arranged so as to be movable in the B-axis direction with respect to the tool rest body 5. As can be seen from FIGS. 3 and 4, the rear end portion of the tool holding shaft 7 has a shape in which the upper and lower portions of the cylinder are planes 7a, and the spring pressing member 10 and the block 11 are formed in this portion. Are fixed by set screws 12. The spring pressing member 10 has a cylindrical shape that fits into the tool holding shaft 7, and its tip portion (main shaft side portion) is cut in the same plane as the plane 7a of the tool holding shaft 7. As is clear from FIG. 2, the block 11 has a guide projection 11a formed at one end (right end in the drawing) and holds a roller 13 at the opposite end. The guide protrusion 11a is engaged with a guide groove 14a formed parallel to the tool holding shaft 7 on a guide plate 14 attached to the side surface of the tool rest body 5, and the tool holding shaft 7 does not rotate in the axial direction thereof. Allow to move. On the other hand, the roller 13 attached to the opposite end of the block 11 is engaged with the cam groove 15a of the cam plate 15 fixed to the B-axis slide 3. As shown in FIG. 1, the cam groove 15a is shaped so as to be closest to the main shaft on the extension of the axis of the work 1 held by the main shaft, and to be separated from the main shaft above and below the main shaft.
That is, the cam plate 15 and the roller 13 form a cam mechanism that brings the tool holding shaft located on the main shaft axis closer to the main shaft than the tool holding shafts at other positions.

A hole 17 surrounding the tool holding shaft 7 is formed in the back surface of the tool rest body 5, a coil spring 18 is arranged in the hole 17, and the surface of the hole 17 is closed by a holding plate 19. This holding plate 19
4, has a long hole 19a through which the flat rear end portion of the tool holding shaft 7 and the tip end portion of the spring pressing member 10 fixed thereto are passed. Spring pushing member 10
Is defined as follows. That is, as shown in FIG. 1, the tool holding shaft 7 located at a position away from the spindle axis.
The spring pressing member 10 mounted on the tool holding shaft 7 is located apart from the coil spring 18, but the tip of the spring pressing member 10 mounted on the tool holding shaft 7 located on the spindle axis is a pressing plate as shown in FIG. It is designed to compress the coil spring 18 through the slotted holes 19a. As a result, only the tool holding shaft 7 on the spindle axis is pressed rearward by the coil spring 18 via the spring pressing member 10, and the cam groove 15a
The rattling of the roller 13 and the roller 13 is prevented, and the position of the tool holding shaft 7 is accurately positioned.

In FIG. 1, 20 is a set screw for fixing the tool holding shaft 7 to the tool rest main body 5, 21 is a pulley attached to the auxiliary shaft 9, 22 is a belt attached to the pulley, and a motor (not shown). It is hung on the pulley of the drive shaft.

Next, the operation of the opposed turret having the above structure will be described. In order to perform the machining by the opposed turret 2, in FIG. 1, the turret main body 5 moves in the Y-axis direction to position a desired tool, for example 8a, at a desired machining position (on the spindle axis or in the vicinity thereof). Due to this operation, only the called tool 8a has the cam groove 15a and the roller 13 at the rear end of the tool holding shaft 7 holding it.
With the engagement with, the tool advances toward the work 1 and the other tools keep the retracted position. Next, the B-axis slide 3 moves in the B-axis direction to perform a predetermined process. At this time, as described above, since the cutting tool 8a used for processing is in the forward position with respect to the tool rest main body 5 and is approaching the work 1, the feed amount by the B-axis slide 3 may be small, and quick processing is possible. In addition, the guide mechanism and drive mechanism of the B-axis slide 3 can be simplified. Further, since the tools 8b and 8c that are not used for machining are both in the retracted position by the cam stroke S with respect to the tool 8a that is being used, there is no concern that cutting chips will be caught during cutting. Further, since the tool not used for machining is in the retracted position, the tooling space is widened accordingly, and the work of exchanging the blade is easy.

In some cases, a certain tool holding shaft is not used, and therefore it may not be necessary to advance the tool holding shaft 5 even when the tool holding shaft passes along the spindle axis due to the movement of the tool rest body 5 in the Y-axis direction. In that case, tighten the set screw 20 (see FIG. 1) and loosen the set screw 12 (see FIG. 3).

〔The invention's effect〕

As described above, according to the present invention, a plurality of tools in which the B-axis slide holds the tool rest main body so as to be movable in the Y-axis direction, and the tool rest main body holds each tool so as to be movable in the B-axis direction. It is configured so that the holding shaft is held and the desired tool holding shaft and tool can be positioned at the workpiece machining position by moving the tool rest main body in the Y-axis direction. Since the shaft is configured to move forward to the position close to the work by the cam mechanism, the movement stroke of the B-axis slide for machining can be reduced, and the guide mechanism and drive mechanism of the B-axis slide can be simplified and machined. It is possible to improve the accuracy, and since the tool holding shaft and the tool in the standby state are retracted, there is no concern about clogging with chips, and it is possible to secure the space necessary for tool replacement, etc. It has the effect.

[Brief description of drawings]

1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a rear end view thereof, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG.
The drawing is a sectional view taken along the line IV-IV in FIG. 1 …… Workpiece, 2 …… Opposing turret, 3 …… B-axis slide, 4…
… Guide member, 5 …… Turret body, 7 …… Tool holding shaft, 7a…
… Plane, 8a, 8b, 8c …… Tool, 9 …… Spindle, 10 …… Spring member, 11 …… Block, 12 …… Set screw, 13 …… Roller, 15…
… Cam plate, 15a …… Cam groove, 18 …… Coil spring, 19 …… Pressing plate.

Claims (1)

[Claims] 1. A B-axis slide which is located in front of a spindle for holding a work and is movable in a B-axis direction parallel to the spindle axis.
A B-axis drive device for moving the B-axis slide in the B-axis direction, a tool rest main body held by the B-axis slide so as to be movable in the Y-axis direction perpendicular to the B-axis direction, and a Y-axis for the tool rest main body. A plurality of tool holding shafts that are movably held in the B-axis direction and are spaced apart from each other on a straight line in the axial direction, and the tool holder is moved in the B-axis direction as the tool rest main body moves in the Y-axis direction. And a cam mechanism for moving the tool holding mechanism, wherein the cam mechanism is configured to bring the tool holding shaft located on the spindle axis closer to the spindle than tool holding shafts at other positions. .