JPH0445284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a chuck device for a lathe, which is improved so that it can grip workpieces of different shapes over a wide range.

<Conventional technology> In machining factories, turning using a lathe usually involves gripping the workpiece (usually round or flange objects) with a chuck device installed at the end of the main shaft of the lathe, and machining it with a cutting tool. is common. The chuck device that grips the material to be cut is
With the advent and automation of lathes equipped with NC devices, the rotary cylinder is actuated by a hydraulic cylinder built into the chuck device body, and multiple jaws that directly grip the workpiece are simultaneously moved to chuck the workpiece. It is becoming possible to automatically attach and detach devices.

<Problems to be Solved by the Invention> However, the movement stroke of the plurality of claws provided on the chuck device was as short as about 10 mm in order to ensure precision in gripping the workpiece. There are also chuck devices with long travel strokes, but they have problems with accuracy. The fact that the movement stroke of the jaw of the chuck device is short in this way means that when building an FMS (Flexible manufacturing system) line using lathes for high-mix, low-volume production, which has been attracting attention in recent years, This is particularly problematic. In other words, conventional chuck devices can only respond to changes in the diameter of the workpiece within the range of the travel stroke of the jaws, which limits the target product types. In order to grip, the claws must be replaced,
It is necessary to take steps such as loosening and re-tightening the bolts.
There were problems such as loss of productivity. In view of the above-mentioned circumstances, an object of the present invention is to provide a chuck device for a lathe that can grip a wide range of workpieces having different shapes, does not require setup, and has high accuracy.

<Means for Solving the Problems> The configuration of the chuck device for a lathe of the present invention that achieves the above object is that a plurality of fitting grooves are bored in the chuck device main body in the radial direction, and a liner is provided in each fitting groove. While the holding member is fitted to be slidable in the radial direction, a driving means for sliding the liner holding member in the radial direction is provided, and the liner holding member is further provided with a drive means according to the size of the material to be cut. A liner that grips the liner is attached replaceably by a clamp device, and the liner holding member has a reference groove in the circumferential direction having two reference surfaces on the inner circumferential side and the outer circumferential side, and the liner has a reference groove in the circumferential direction. The liner is characterized in that it has a convex portion that is fitted into and held between the two reference surfaces, and that the clamp device is disposed radially inward with respect to the liner.

<Operation> When the liner holding member and liner are moved in the radial direction by the drive device according to the change in the diameter of the material to be cut,
The material to be cut can be gripped by the liner. If the workpiece exceeds the travel stroke range,
It is best to replace liners with different radial widths. In this way, the range of the workpiece gripped by the liner exceeds the range of the movement stroke, and even in such a case, the workpiece can be gripped. The liner can be easily replaced using the clamping device, so no setup changes are required. Furthermore,
The liner has a convex portion that fits into a reference groove formed on the liner holding member, and this convex portion is held between two reference surfaces on the inner and outer circumferential sides of the fitting groove, so that the inner side of the liner Not only can the workpiece be gripped by using the peripheral side, but also the workpiece can be gripped by using the outer peripheral side of the liner. Further, since the clamp device is provided relatively inwardly, it is not affected by centrifugal force.

<Example> A first example of the chuck device for a lathe of the present invention will be described below.
It is shown in FIGS. As shown in the figure, the chuck device main body 1 has three T-shaped fitting grooves drilled at equal intervals in the radial direction.
A liner holding member composed of a key 3, a lower claw 4, etc. is fitted to be slidable in the radial direction. That is, a hydraulic cylinder or a rotary cylinder (not shown) is connected to the base pawl 2 that fits into the fitting groove, and a T-shaped fitting groove is formed, and the key 3 is slid into this fitting groove. They are fitted together so that they can move freely. A lower claw 4 is placed on the upper surface of the base claw 2, and the lower claw 4 and the key 3 are fastened together with bolts 5.
Serration grooves that fit into each other are formed on the contact surfaces of the two. Therefore, the liner holding member consisting of the base claw 2, key 3, lower claw 4, etc. can be moved in the radial direction by operating the hydraulic pressure or the rotary cylinder,
It is possible to replace or adjust the position of the lower claw 4 by loosening the bolt 5.

Furthermore, a clamp device for attaching the liner 6 to the lower claw 4 in a replaceable manner is composed of a spring 7, a clamp bar 8, a stopper 9, and the like. That is, lower nail 4
A clamp bar 8 passes through the clamp bar 8 so as to be movable in the radial direction, and a stopper 9 is screwed onto the inner end of the clamp bar 8. A spring 7 is pressed between the stopper 9 and the lower claw 4. equipped. A head is formed on the outer diameter side end of the clamp bar 8, and a reference groove 10 into which the liner 6 fits is formed in the lower claw 4 in the circumferential direction on the lower side of the head, as shown in FIG. It is formed. As shown in FIG. 5, the liner 6 has an arcuate shape having a convex portion 11 that fits into the reference groove 10 and a groove 12 that fits into the head of the clamp bar 8, and as shown in FIG. It comes into contact with the inner or outer surface of the material to be cut 13 and grips it. Reference groove 10
has two reference surfaces 10a and 10b on the inner and outer circumferential sides, as shown in FIGS. It is held between surfaces 10a and 10b. A groove 12 into which the clamp bar 8 fits is formed in the circumferential center of the liner 6 in the width direction. Therefore, the liner 6 can be easily replaced by pushing the clamp bar 8 outward against the spring force of the spring 7 to remove the clamp bar 8 from the groove 12, as shown in FIG. . As the liner 6, there are various liners 6, 6', and 6' having different widths h as shown in FIG.
6" is prepared and is replaced according to the inner diameter of the workpiece 13. Convex portions 11 of the liners 6, 6', 6"
The radius of curvature of the inner and outer surfaces of the lower claw 4 and the height thereof both match the radius of curvature of the inner and outer surfaces of the reference groove 10 of the lower claw 4 and the depth thereof.

The procedure for replacing the liner 6 in the lathe chuck device of this embodiment having the above configuration will be explained. First, a hydraulic cylinder or a rotary cylinder built into the chuck device main body 1 is operated, and the base jaw 2 is
and move the lower claw 4 to the stroke forward limit (closed limit) or backward limit (open limit). Next, the stopper 9 attached to the clamp bar 8 is pushed out in the direction of the arrow as shown in FIG. 7, and the head of the clamp bar 8 is removed from the groove 12 of the liner 6. Then, the liner 6 is pulled out from the reference groove 10 as shown in FIG. After this, select the liner 6, 6', 6'' according to the inner diameter of the workpiece 13 that is scheduled to be turned next,
The protrusion 11 of the liner is fitted into the reference groove 10 of the lower claw 4, and at the same time, the groove 12 of the liner is fitted into the clamp bar 8. Next, the pressure on the stopper 9 that has been pressed until now is stopped, and the head of the clamp bar 8 is pressed against the groove 12 of the liner 6 by the spring force of the spring 7. Since the liner 6 is thus clamped to the lower claw 4, the liner 6 will not fall off or scatter from the reference groove 10 of the lower claw even if the chuck device main body 1 is rotated under no load.

In the above-described embodiment, the clamping device is configured so that the liner 6 can be replaced manually, but the liner may be replaced automatically using a motor, hydraulic pressure, or the like. Also,
As described above, the convex portion 11 of the liner 6 fits into the reference groove 10 of the liner holding member, and the reference surfaces 10a,
10b, the liner 6 is not limited to one that comes into contact with the inner surface of the workpiece 13 and grips it from the inside; it also comes into contact with the outer surface of the workpiece 13 and grips it from the outside. It may be something you do. Furthermore, since the clamping device is placed radially inward with respect to the liner 6, the influence of centrifugal force is small, and vibrations during chuck rotation are small, resulting in long bearing life and excellent machining accuracy. .

<Effects of the Invention> As explained above in detail, the lathe chuck device of the present invention can accommodate a wide range of diameter sizes of cut materials by easily replacing the liner, and is suitable for high-variety, low-volume production. Suitable for FMS targeting.

[Brief explanation of drawings]

1 to 9 relate to one embodiment of the present invention, FIG. 1 is a front view of a chuck device for a lathe, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. a- in the diagram
A cross-sectional view on line a, Figure 4a is a front view of the lower claw, Figure 4b
is a cross-sectional view taken along line bb in Figure 5a, Figure 5a is a front view of the liner, Figure 5b is a view taken in the direction of arrow B in Figure 5a,
Figure 5c is a sectional view taken along the line c-c in figure a, Figure 6,
Figure 7 is a sectional view and side view of the lower claw and liner;
The figure is an explanatory diagram showing how a workpiece is gripped by the lower jaw and the liner, and FIGS. 9a, 9b, and 9c are sectional views of various liners. In the drawing, 1 is the chuck device body, 2 is the base claw, and 3 is the chuck device body.
is the key, 4 is the lower claw, 5 is the bolt, 6 is the liner, 7
is a spring, 8 is a clamp bar, 9 is a stopper, 10
11 is a reference groove, 11 is a convex portion, 12 is a groove, and 13 is a material to be cut.

Claims (1)

[Claims] 1 A plurality of fitting grooves are drilled in the chuck device main body in the radial direction, and a liner holding member is fitted into each fitting groove so as to be slidable in the radial direction, while the liner holding member is slidable in the radial direction. Further, the liner holding member is provided with a liner that grips the workpiece depending on the size of the workpiece so as to be replaceable by a clamp device, and the liner holding member is attached to the inner peripheral side and a reference groove having two reference surfaces on the outer peripheral side in the circumferential direction, and the liner has a convex portion that fits in the reference groove and is held between the two reference surfaces, A chuck device for a lathe, characterized in that a clamping device is arranged radially inward with respect to the liner.