JP7245658B2 - Lathe workpiece pressing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work pressing device for pressing one end of a work against a mounting reference plane of a chuck provided at the tip of a spindle in a lathe such as an NC lathe.

In lathes such as NC lathes, when a workpiece is attached to the chuck at the tip of the spindle, a workpiece pressing device is used that presses one end of the workpiece against the workpiece mounting reference surface in order to prevent the workpiece from tilting and improve machining accuracy. ing.
The work pressing device consists of a plate-like pressing piece attached to the tool mounting station of the turret tool post of the lathe. A device configured to be pressed is known.
However, in the case of the above device, it is necessary to prepare a plurality of pressing pieces according to the size of the work, and to replace the pressing pieces each time the size of the work changes, so there is a problem in workability. . Moreover, in the case of the above device, it is necessary to prevent the pressing piece from interfering with the saddle cover or the like when the turret tool post is turned. At the tool mounting station adjacent to the tool mounting station, there was a case where the tool could not be mounted due to interference with the pressing piece.

In order to solve the above problem, for example, a work pressing device disclosed in Patent Document 1 below has been proposed. This device consists of a cylindrical body having a proximal end mounted in a tool mounting station of a turret tool post of a lathe, and a cylindrical body extending parallel to the axis of the body and rotating equally spaced circumferentially around the distal portion of the body. a plurality of swivel shafts mounted so as to be possible; fluid pressure driving means provided in the main body for simultaneously swiveling the plurality of swivel shafts in the same direction; and a plurality of pressing pieces to be pressed against the portion, and the plurality of pressing pieces are opened and closed by turning the plurality of turning shafts by the fluid pressure driving means.
According to the above device, by turning the plurality of pressing pieces outward to open, it is possible to handle a larger size (diameter) work, and turning the plurality of pressing pieces inward to close. In addition, it is possible to prevent interference with the saddle cover, etc., when the turret tool post rotates, and the tool mounting station adjacent to the tool mounting station where the main body of the device is mounted also does not interfere with the pressing piece. Tools can be attached.

Utility Model Registration No. 2533680

However, in the case of the work pressing device described in Patent Literature 1, the arrangement of the plurality of pressing pieces is limited to two modes of opening outward to the maximum extent and closing inward to the maximum. I had a problem with less.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work pressing device for a lathe which can easily cope with pressing of various sizes of works without exchanging pressing pieces.

This invention consists of the following aspects in order to achieve said objective.
In specifying the present invention, the "front" of the work pressing device refers to the side closer to the work to be pressed (for example, the left side in FIGS. 1 and 3), and the "rear" refers to the opposite side (for example, FIGS. 3 right).

1) In a lathe comprising a spindle, a chuck provided at the tip of the spindle to hold a workpiece, and a turret tool post, a workpiece pressing for pressing one end of the workpiece against the mounting reference surface of the chuck. a device,
a hollow body attached to the turret tool post and having a front wall in which at least three slits radially extending from a central portion are formed at regular intervals in the circumferential direction;
a disk housed inside the body so as to be rotatable concentrically with the front wall and having a scroll groove on its front surface;
a disk rotation device for rotating the disk;
It has teeth on the rear surface that mesh with the scroll grooves, has a pressing surface on the front surface that is pressed against the other end of the work, and slides along the at least three slits on the front wall of the body. at least three push pieces removably attached to the
A work pressing device for a lathe, wherein the at least three pressing pieces are simultaneously slid along the at least three slits by rotating the disk by the disk rotating device.

2) The work pressing device for a lathe according to 1) above, wherein the turret tool post is provided with drive means capable of rotating a rotary tool, and the disk rotation device utilizes the drive means.

3) the disk is donut-shaped with a circular hole in the center;
The disc rotating device has a connecting portion connected to the driving means, a transmission shaft having one end held in the connecting portion, and the other end of the transmission shaft and a peripheral edge portion of the hole in the disc. and a gear mechanism formed so as to mesh with each other.

4) The work pressing device for a lathe according to any one of 1) to 3) above, wherein the body is elastically attached to the turret tool rest so as to absorb the impact of pressing the work.

5) a pressing piece body in which the at least three pressing pieces have the teeth on the rear surface and are attached to the front wall of the body so as to be slidable along the at least three slits; A lathe workpiece pressing device according to any one of 1) to 4) above, further comprising a pressing surface forming body elastically attached to the pressing piece body so as to absorb the impact of the pressing piece.

According to the work pressing device for a lathe of 1) above, by rotating the disk by a required angle (amount of rotation) in a required direction by means of the disk rotating device, at least three pressing pieces are moved to at least three radial positions of the front wall. Since they are simultaneously slid along the slits and arranged at arbitrary positions, it is possible to easily cope with the pressing of works of various sizes.

According to the lathe work pressing device of 2) above, since the disk rotation device uses the rotary tool drive means provided in the turret tool post, there is no need to use a dedicated drive means, and installation Reduce costs. In addition, when the rotary tool drive means provided on the turret tool post can be operated and controlled by a program, the position of the pressing piece can be easily adjusted using the program. The time required for setup is greatly reduced.

According to the lathe work pressing device of 3) above, the disk rotating device has a simple structure consisting of a connecting portion connected to the rotary tool drive means of the turret tool post, a transmission shaft, and a gear mechanism. , easy to assemble and maintain, and low cost.

According to the work pressing device for the lathe of 4) above, the body elastically attached to the turret tool post absorbs the impact when the work is pressed, so that the work, the chuck and the pressing piece are not damaged. can be effectively suppressed.

According to the work pressing device for a lathe of 5) above, the pressing surface forming body elastically attached to the pressing piece main body of each pressing piece absorbs the impact when the workpiece is pressed. and damage to the pressing piece can be effectively suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the outline of the lathe provided with the workpiece|work pressing apparatus which concerns on embodiment of this invention. It is a front view of the same work pressing device. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 3 is a partially enlarged cross-sectional view taken along line IV-IV of FIG. 2; FIG. FIG. 5 is a view equivalent to FIG. 4 showing a modification of the pressing member of the work pressing device;

Next, embodiments of the present invention will be described with reference to FIGS. 1 to 5. FIG.
In the following description, the left side of FIGS. 1 and 3 is called "front" and the right side is called "rear".

As shown in FIG. 1, a lathe (1) according to an embodiment of the present invention includes a spindle (3) extending in the front-rear direction (Z-axis direction) and rotatably mounted on a headstock (2); A chuck (4) that is attached to the rear end (front end) of (3) and holds the workpiece (W), and a turret tool post (5) that is provided behind the chuck (4) so that it can be swiveled and indexed. and
The chuck (4) includes a chuck body (41) and three chuck claws (42) attached to the chuck body (41) so as to be slidable in the radial direction and openable and closable. A mounting reference surface (411) is formed by the rear surface of the chuck body (41).
The turret tool post (5) is movable in the Z-axis direction and the X-axis direction by drive means (not shown). A plurality of tool mounting stations (51) are provided at equal intervals in the circumferential direction on the outer periphery of the turret tool post (5). Further, the turret tool post (5) is provided with driving means (not shown) such as a motor capable of rotating rotary tools such as end mills and drills. The driving means can be controlled in the direction of rotation, angle of rotation (amount of rotation), etc. by a program. One tool mounting station (51) of the plurality of tool mounting stations (51) is provided with a connecting portion (6) that connects to the driving means. The connecting part (6) has a casing (61) and a holding part (62) rotatably arranged in the casing (61) and rotated by a driving means.

The lathe (1) is also provided with a work pressing device (7) for pressing the front end of the work (W) against the mounting reference surface (411) of the chuck (4).
2 to 4 show the details of the work pressing device (7). In FIG. 3, illustration of the cross-sectional structure of the turret tool post (5) and the connecting portion (6) is omitted. As shown in these figures, the work pressing device (7) is attached to the turret tool post (5) and has three slits (811) radially extending from the center and formed at regular intervals in the circumferential direction. A hollow body (8) having a wall (81), and a scroll groove (91) on the front side while being rotatably accommodated in the body (8) concentrically with the front wall (81). , a disk rotating device (10) for rotating the disk (9), teeth (111) meshing with the scroll grooves (91) on the rear surface, and a workpiece ( W) has a pressing surface (112) that is pressed against the rear end, and is slidable along three slits (811) in the front wall (81) of the body (8) and is a distance from the center. It has three pressing pieces (11) which are mounted so that they are equal to each other.
In the work pressing device (7), the disk (9) is rotated by the disk rotating device (10), so that the three pressing pieces (11) move along the three slits (811). At the same time, that is, they are slid in the same direction (radially inward or outward) by the same distance.

The body (8a) is in the shape of a hollow disc, and is mounted across the front surface of the turret tool post (5) and the front surface of the casing (61) of the connecting portion (6) via the base plate (12). .
More specifically, the body (8) includes a body body (8a) having a circular rear wall (82) and an annular peripheral wall (83) extending short forward from the outer peripheral edge of the rear wall (82), and a body body (8a). ) and a circular body cover (8b) that forms a front wall (81) by being joined to the main body (8a) so as to cover the front opening of the body (8b). A circular hole (812) is formed in the center of the body lid (8b), that is, the front wall (81). However, this hole (812) may not be formed.
On both side edges of each slit (811) in the front wall (81), an engagement ridge (813) extending along the length direction of the slit (811) is formed at the mid-width position (Fig. 4). reference).
The base plate (12) is, for example, triangular as shown in FIG. fastening is fixed. The shape of the base plate (12) is not limited to the triangular shape, and may be any other shape such as a quadrangular shape.
A body (8) is attached to the base plate (12) with a plurality of mounting bolts (14). Each mounting bolt (14) is slidably inserted in the longitudinal direction through a bolt insertion hole (121) formed in the base plate (12). A housing recess (122) capable of housing the head (141) of the mounting bolt (14) is formed in the rear portion of the bolt insertion hole (121). The depth of the accommodation recess (122) is greater than the height of the head (141) of the mounting bolt (14). The tip of the mounting bolt (14) is screwed into a threaded hole (821) formed in the rear surface of the rear wall (82) of the body (8). A compression coil spring (15) is fitted to the outer periphery of the mounting bolt (14) at an intermediate length so as to be interposed between the base plate (12) and the body (8). The compression coil spring (15) urges the body (8) and the three pressing pieces (11) attached to its front wall (81) forward. With the mounting structure described above, the body (8) is elastically mounted on the turret tool post (5), thereby absorbing the impact when pressing the workpiece.

The disk (9) is donut-shaped with a circular hole (92) in the center.
A large number of teeth (93) are formed at a constant pitch in the circumferential direction on the inner peripheral edge of the disc (9).

The disk rotation device (10) utilizes rotary tool drive means provided on the turret tool post (5). More specifically, the disc rotating device (10) includes a connection portion (6) attached to the tool mounting station (51) and connected to the driving means, and a holding portion (62) of the connection portion (6) at the rear end. ) and a number of teeth (93) formed on the inner peripheral edge of the disc (9) and teeth of the disc (9) formed on the front end of the transmission shaft (16). A gear mechanism consisting of a gear (17) having a number of teeth (171) meshing with (93). The transmission shaft (16) is rotatable loosely through the base plate (12) and the rear wall (82) of the body (8).
When the holding part (62) of the connecting part (6) is rotated in a desired direction by a driving device (not shown), the transmission shaft (16) is rotated, and its rotational motion is caused by the teeth of the gear (17) and the disk (9). It is transmitted to the disk (9) through the gear mechanism (92), and the disk (9) rotates.

The three pressing pieces (11) are of the same shape and size, each having the shape of a short square bar. Both side surfaces of each pressing piece (11) are provided with engagement ridges (813) formed on both side edges of the slit (811) in the front wall (81) of the body (8). A groove (113) is formed. By inserting the engaging ridges (813) into these engaging grooves (113) and engaging with each other, the pressing pieces (11) are attached to the front wall (81) of the body (8), It is slidably attached along the length direction of each slit (811). Contrary to the above configuration, each pressing piece (11) is formed with engaging ridges on both sides thereof, and engages with both side edges of the slit (811) in the front wall (81) of the body (8). Grooves may be formed.
The teeth (111) on the rear surface of the three pressing pieces (11) mesh with the scroll grooves (91) on the front surface of the disk (9), so that when the disk (9) rotates, the slit (811) is formed. They are slid simultaneously in the longitudinal direction, i.e. in the radial direction. In FIGS. 2 and 3, the solid line indicates the pressing piece (11) arranged in the fully open position where the distance from the center of the front wall (81) of the body (8) is the farthest. The position of the pressing piece (11), which is located at the fully closed position where is closest to By appropriately adjusting, it is possible to arbitrarily change and adjust according to the size (outer diameter) of the work (W) to be pressed. Since the driving means such as a motor connected to the connecting portion (6) can be controlled by a program in terms of rotation direction, rotation angle (amount of rotation), etc., the pressing piece (11) can be controlled by using the same program. position can be easily adjusted, greatly shortening the time required for setup.
At least three pressing pieces 11 are sufficient as shown in the drawing, but four or more may be provided.

FIG. 5 shows a modification of the pressing piece.
The illustrated pressing piece (110) has a tooth (111) on its rear surface that meshes with the scroll groove (91) and is slidable along the slit (811) in the front wall (81) of the body (8). It comprises an attached pressing piece body (110A) and a pressing surface forming body (110B) elastically attached to the pressing piece body (110A) so as to absorb the impact when pressing the workpiece. ing.
The pressing piece body (110A) has substantially the same shape as the pressing piece (11) shown in FIG. A groove (113) is formed.
The pressing surface forming body (110B) has a plate-like shape, and its front surface constitutes the pressing surface (112). mounted on the front. Each mounting bolt (18) is slidably inserted in the longitudinal direction through a bolt insertion hole (114) formed in the pressing surface forming member (110B). A housing recess (115) capable of housing the head (181) of the mounting bolt (18) is formed in the rear portion of the bolt insertion hole (114). The depth of the accommodation recess (115) is greater than the height of the head (181) of the mounting bolt (18). The tip of the mounting bolt (18) is screwed into a threaded hole (116) formed in the front surface of the pressing piece body (110A). A compression coil spring (19) is provided on the outer periphery of the intermediate portion of the mounting bolt (18) so as to be interposed between the pressing piece body (110A) and the pressing surface forming body (110B). is fitted. The compression coil spring (19) urges the pressing surface forming body (110B) forward. With the mounting structure described above, the pressing surface forming body (110B) is elastically attached to the pressing piece main body (110A), thereby absorbing the impact when pressing the workpiece.
When using the pressing piece (110), the body (8) may be fixedly attached to the turret tool post (5).

According to the work pressing device (7) described above, the following effects can be obtained.
That is, according to the work pressing device (7), the disk rotating device (10) rotates the disk (9) by a desired angle (amount of rotation) in a desired direction, thereby rotating the three pressing pieces (11). (110) can be slid along the slit (911) of the front wall (91) of the body (9) and accurately positioned at the desired position in a short period of time. It is possible to easily cope with the pressing operation of a plurality of types of workpieces (W) having different sizes (outer diameters) without exchanging them. Compared to devices with patches, this is considerably more. In addition, in the case of the work pressing device (7), the disk rotation device (10) utilizes a programmable rotating tool driving means provided in advance in the turret tool post (5). There is no need to use dedicated driving means, including programs for control, and installation costs can be reduced. In addition, according to the work pressing device (7), the three pressing pieces (11) are positioned beyond the range of the maximum turning radius to avoid interference with the saddle cover and the like when the turret tool post (5) turns. ) (110) can be arranged, the posture of the work (W) during pressing is stabilized. Moreover, according to the work pressing device (7), even at the tool mounting station (51) adjacent to the tool mounting station (51) in the turret tool post (5) to which the device (7) is mounted, depending on the type, Tools can be attached.
Further, the work pressing device (7) has a simple structure, so that it is easy to assemble and maintain, and the cost can be reduced.
Furthermore, according to the work pressing device (7), the body (8) elastically attached to the turret tool post (5) and the pressing piece body (110A) of the pressing piece (110) are elastically moved. The attached pressing surface forming body (110B) absorbs the impact when pressing the workpiece, thereby preventing damage to the workpiece (W), chuck (4) and pressing pieces (11) and (110). can be effectively suppressed.

INDUSTRIAL APPLICABILITY The present invention is suitable for a lathe such as an NC lathe equipped with a turret tool post as a work pressing device for pressing one end of a work against a mounting reference plane of a chuck provided at the tip of a spindle.

(1): Lathe
(3): Spindle
(4): Chuck
(411): Mounting reference plane
(5): Turret turret
(6): Connection
(62): Holding part
(7): Work pressing device
(8): Body
(81): Front wall
(811): Slit
(9): Disk
(91): Scroll groove
(92): hole in the center
(93): Tooth (gear mechanism)
(10): Disk rotating device
(11): Pressing piece
(110): Pressing piece
(110A): Pushing piece body
(110B): Pressing surface forming body
(111): Teeth
(112): Pushing surface
(14): Mounting bolt
(15): Compression coil spring
(16): Transmission shaft
(17): Gear (gear mechanism)
(18): Mounting bolt
(19): Compression coil spring
(W): Work

Claims (4)

A work pressing device for pressing one end of the work against a mounting reference plane of the chuck in a lathe comprising a spindle, a chuck provided at the tip of the spindle to hold the work, and a turret tool post. There is
a hollow body attached to the turret tool post and having a front wall in which at least three slits radially extending from a central portion are formed at regular intervals in the circumferential direction;
a disk housed inside the body so as to be rotatable concentrically with the front wall and having a scroll groove on its front surface;
a disk rotation device for rotating the disk;
It has teeth on the rear surface that mesh with the scroll grooves, has a pressing surface on the front surface that is pressed against the other end of the work, and slides along the at least three slits on the front wall of the body. at least three push pieces removably attached to the
By rotating the disc by the disc rotating device, the at least three pressing pieces are simultaneously slid along the at least three slits ,
A work pressing device for a lathe, wherein the turret tool post is provided with drive means capable of rotating a rotary tool, and the disk rotation device utilizes the drive means. wherein the disc is donut-shaped with a circular hole in the center;
The disc rotating device has a connecting portion connected to the driving means, a transmission shaft having one end held in the connecting portion, and the other end of the transmission shaft and a peripheral edge portion of the hole in the disc. 2. A lathe work pressing device according to claim 1 , further comprising a gear mechanism formed to mesh with each other. 3. A lathe work pressing device according to claim 1 , wherein said body is elastically attached to said turret tool post so as to absorb an impact when the work is pressed. a pressing piece body in which the at least three pressing pieces have the teeth on the rear surface and are attached to the front wall of the body so as to be slidable along the at least three slits; 4. The work pressing device for a lathe according to claim 1, further comprising a pressing surface forming body elastically attached to said pressing piece body so as to absorb the pressure.

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