JPH01121108A - Opposed tool post for machine tool - Google Patents

Abstract

PURPOSE:To reduce the stroke of movement of B-axis by providing a cam mechanism for moving a tool holder in B-axis direction, and forming the cam mechanism so that it locates a tool holding shaft arranged on an axis line of a main spindle close to the main spindle compared with other tool holding shafts arranged at other positions. CONSTITUTION:In order to perform machining operations by an opposed tool post body 6 moves in Y-axis direction, for example, a desired cutting tool 8a is positioned at a desired machining position. By the operations, only the cutting tool 8a advances toward a work 1 by engagement of a cam groove 15a at the rear end of a tool holding shaft 7 holding the cutting tool with a roller 13, while other cutting tools are withdrawn to retracted positions. Then after a B-axis slide 3 moves in B-axis direction, a specified machining operation is performed. At this time, since the cutting tool 8a is at an advanced position with respect to the tool post body 5 and brought close to the work 1, the amount of feeding by B-axis slide 3 can be reduced. And the cutting tools 8b, 8c being out of use for machining are located at retracted positions, so that the tooling space becomes larger so much.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an opposed tool rest disposed in a position facing a main shaft that holds a workpiece in a machine tool.

[Conventional technology]

In numerically controlled lathes, etc., in order to increase the variety of machining operations, a machine tool is known in which a tool rest (hereinafter referred to as the "opposed tool rest") is placed opposite the main spindle that holds the workpiece to perform workpiece edge machining, etc. It has been 9 times. A known opposing tool rest is one in which a plurality of tools are mounted in parallel on the tool rest, and the desired tool is selected by moving the tool rest in a direction perpendicular to the spindle axis direction. (For example, see JP-A-62-124803)
. However, as seen in this publication, the conventional opposed tool rest is fixed in the axial direction of the main spindle, and the workpiece is moved in the axial direction by the main spindle for machining and feeding.

Recently, we have increased the number of types of machining that can be performed using tools on the opposing tool post.

In addition, in order to enable simultaneous machining with tools held on other tool rests, the tool rest main body holding multiple tools is mounted on the B-axis slide, and the B-axis slide is parallel to the spindle axis direction.
A device that is moved by C control has been developed. This type of opposed tool rest is positioned quite far away from the end surface of the workpiece during standby to prevent the tip of the tool held from interfering with the workpiece held on the spindle and to secure the space necessary for tool exchange. is positioned.

[Problem that the invention seeks to solve]

However, the opposing tool rest with such a configuration requires a large amount of movement of the tool rest main body in the B-axis direction during machining, and N
It requires a long movement stroke using C control.

Accordingly, the guide mechanism and drive mechanism of the tool rest main body have to be made longer, resulting in lower machining accuracy and longer machining time. To avoid this.

Although it is possible to keep the tip of the tool held on the opposing tool post close to the end surface of the workpiece, this configuration reduces the tooling space and impairs workability such as tool exchange.

Further, problems such as chips from machining adhering to waiting tools occur.

The present invention aims to solve such problems, and aims to provide an opposed tool rest for a machine tool that can reduce the B-axis movement stroke by NC control while securing the necessary tooling space in front of the main spindle. do.

[Means for solving problems]

The present invention is located in front of a main shaft that holds a workpiece.

A shaft slide parallel to the spindle axis and movable in the axial direction, a B-axis drive device that moves the B-axis slide in the B-axis direction, and the B-axis slide movable in the Y-axis direction perpendicular to the B-axis direction. and a plurality of tool holding shafts held on the tool rest body at intervals in a straight line in the Y-axis direction and movable in the B-axis direction.

a cam mechanism that moves the tool holder in the B-axis direction as the tool post main body moves in the Y-axis direction; The gist of this invention is a opposed tool rest for a machine tool, which is characterized in that it is configured to be closer to the main shaft than the holding shaft.

〔Example〕

The present invention will be described in detail below with reference to an embodiment of the present invention shown in one drawing.

1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a rear end view, and FIG. 3 is a sectional view taken along the line mm in FIG. 2.

4 is a sectional view taken along the line IV-TV in FIG. 3. FIG. In these figures, ■ is a workpiece to be machined, which is held by a main shaft (not shown). Reference numeral 2 denotes a counter tool rest provided opposite to the main shaft. The opposing tool rest 2 includes a shaft slide 3 that is parallel to the spindle axis and movable in the axial direction as shown by arrow B, and a B-axis drive device (not shown) that moves the B-axis slide 3 in the B-axis direction. This 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 this guide member 4 holds a tool rest main body 5 that is movable in the Y-axis direction perpendicular to the B-axis direction as shown by arrow Y. Further, a Y-axis drive device (not shown) for moving the tool rest main body 5 in the Y-axis direction is also provided.

The tool rest main body 5 has different tools 8a at its tips.

A plurality of (three in the illustrated embodiment) tool holding shafts 7 to which 8b and 8c are attached and a sub-shaft 9 for machining the back side of the workpiece are aligned parallel to the main shaft axis and on a straight line in the Y-axis direction. They are kept at intervals. Therefore, by moving the tool rest main body 5 in the Y-axis direction, the desired tool 8a can be moved.

13b and 13c can be positioned at the workpiece processing position, and the counter shaft 9 can be positioned at the workpiece 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 main body 5. As can be clearly seen from FIGS. 3 and 4, the rear end portion of the tool holding shaft 7 has a shape with the upper and lower portions of a nine-cylindrical cylinder having a flat surface 7a, and a spring pushing member 10 and a block 11 are attached to this portion. is fixed by a set screw 12. The spring pushing member 10 has a cylindrical shape that fits into the tool holding shaft 7, and its tip portion (portion on the main shaft side) is cut on the same plane as the plane 7a of the tool holding shaft 7. As can be clearly seen from FIG. 2, the block 11 has a guide protrusion 11a formed at one end (the right end in the drawing) and a roller 13 held at the opposite end.

The guide protrusion 11a engages with a guide groove 14a formed in a guide plate 14 attached to the side surface of the tool post main body 5 in parallel to the tool holding shaft 7, so that the tool holding shaft 7 can move in the axial direction without rotating. Allow to move.

On the other hand, a roller 13 attached to the opposite end of the block 11
is the cam groove 15 of the cam plate 15 fixed to the B-axis slide 3
It is engaged with a. As shown in FIG.
The shape is such that it is closest to the main axis and moves away from the main axis above and below. That is, the cam plate 15 and the collar 13 constitute a cam mechanism that brings the tool holding shaft located on the main shaft axis closer to the main shaft than tool holding shafts located at other positions.

A hole 17 surrounding the tool holding shaft 7 is formed in the back side of the tool rest main body 5, a coil spring 18 is disposed in the hole 17, and the surface of the hole 17 is closed with a presser plate 19. This presser plate 19 is clearly visible in FIG.

It has an elongated length 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 pass. The length of the spring pressing member 10 is determined as follows. That is, as shown in FIG. 1, the spring pushing member 10 attached to the tool holding shaft 7 located away from the spindle axis is located away from the coil spring 18, but the spring pushing member 10 is attached to the tool holding shaft 7 located on the spindle axis. As shown in FIG. 4, the spring pressing member 10 attached to
The coil spring 18 is compressed through the elongated hole 19a. by this.

Only the tool holding shaft 7 on the main shaft axis and the spring pressing member 10
is pressed rearward by the coil spring 18 via
This prevents rattling between the cam groove 15a and the roller 13.

The tool holding shaft 7 is accurately positioned.

In FIG. 1, 20 is a set screw that fixes the tool holding shaft 7 to the tool post main body 5, 21 is a pulley attached to the subshaft 9, 22 is a heald hung on the pulley, and a motor (not shown) is attached to the pulley. (2) is hung on the pulley of the drive shaft.

Next, the operation of the opposed tool post having the above configuration will be explained. In order to perform machining using the opposing tool post 2, see FIG.

The tool rest main body 5 moves in the Y-axis direction and picks up a desired tool, for example 8.
a to a desired machining position (on or near the spindle axis). Due to this operation, only the called tool 8a is removed from the cam groove 15 at the rear end of the tool holding shaft 7 that held it.
The tool a moves forward toward the workpiece 1 due to its engagement with the roller 13, and the other tools remain in the retracted position. Next, the B-axis slide 3 moves in the B-axis direction to perform predetermined processing. At this time, as mentioned above.

Since the cutter 8a used for machining is in the forward position relative to the turret main body 5 and is approaching the workpiece 1, the B-axis slide 3
The amount of feed required by this method is small, allowing quick machining, and the guide mechanism and drive mechanism of the B-axis slide 3 can be simplified. In addition, tools 8b, 8 not used for machining
c is a cam stroke 8 that is longer than the tool 8a in use.
Since it is in the retracted position, there is no need to worry about chips getting caught during cutting. Furthermore, since the tools that are not used for machining are in the retracted position, the tooling space is increased accordingly, making it easier to change blades, etc.

In addition, the tool holding shaft, which may be used in some cases, is not used.

Therefore, even when the tool holding shaft passes over the spindle axis due to movement of the tool rest main body 5 in the Y-axis direction, it may not be necessary to move it forward. In that case, it is sufficient to tighten the set screw 20 (see FIG. 1) and loosen the set screw 12 (see FIG. 3).

〔Effect of the invention〕

As explained above, one aspect of the present invention is to have a B-axis slide hold a turret main body movably in the Y-axis direction, and a plurality of tools each holding a tool in the turret main body movably in the B-axis direction. The holding shaft is held and the desired tool holding shaft and tool are positioned at the workpiece machining position by moving the tool post main body in the Y-axis direction. Since the shaft is moved forward to a position close to the workpiece by a cam mechanism, the movement stroke of the B-axis slide for machining can be reduced, and the guide mechanism, drive mechanism, etc. of the B-axis slide can be simplified and the machining can be easily performed. Accuracy can be improved,
Moreover, since the tool holding shaft and the tool are retracted during standby, there is no need to worry about chips being involved, and the space necessary for tool exchange etc. can be secured.

[Brief explanation of the drawing]

1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a rear end view, and FIG. 3 is a sectional view taken along the line mm in FIG. 2. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. 1-Workpiece, 2-Opposing tool rest, 3-B-axis slide. 4-guide member, 5-turret main body, 7-tool holding shaft. 7a-plane, 8a, 8b, 8cm tool, 9
- Subshaft, 10 - Spring pressing member, 11 - Block, 12
- Set screw. 13-Roller, 15-Cam plate, 15a-Cam groove, 18
- coil spring, 19 - holding plate. Agent Patent Attorney Kyozo Nori Matsu

Claims (1)

[Claims] A B-axis slide located in front of the main spindle that holds the workpiece and movable in the B-axis direction parallel to the main spindle axis, a B-axis drive device that moves this B-axis slide in the B-axis direction, and a B-axis slide that moves the B-axis slide in the B-axis direction. , a tool rest main body held movably in the Y-axis direction perpendicular to the B-axis direction; The cam mechanism includes a plurality of tool holding shafts and a cam mechanism that moves the tool holder in the B-axis direction as the tool post body moves in the Y-axis direction, and the cam mechanism is a tool holding shaft located on the spindle axis. An opposing tool rest for a machine tool, characterized in that the tool rest is configured to be positioned closer to the main spindle than tool holding axes at other positions.