JPH018243Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chuck device for supporting a workpiece having at least a cylindrical end.

[Conventional technology]

Conventionally, this type of chuck device has a drawbar 2 slidably inserted into a cylindrical main shaft 1 fastened to the rear surface of a machine frame 3, as shown in FIGS. 1 to 3, for example. A collar 11 is slidably inserted into the center hole 2A of the drawbar 2, a rod portion 5A of the center 5 is slidably inserted into the collar 11, and the collar 11 and the center 5 are connected to the spring 4 and the spring. 6, each is biased in the direction of the workpiece W,
The sliding movement of the center 5 is regulated by the elongated hole 51A of the rod portion 5A and the pin 12. The center 5 is further supported by a shaft passing through the shaft hole 3A of the main body 3, and a mounting plate 7 is fastened to the front end surface of the drawbar 2. A camshaft 8 is extended from the lower part of the mounting plate 7. A pair of wedge surfaces 8A are provided at the tips of both sides of the camshaft 8.
8A is formed, and the pair of wedge surfaces 8A, 8A are formed on the front surface 3C of the machine frame 3.
The pair of arc-shaped clamp jaws 9, 9 are in contact with the root end surfaces 9A, 9A guided by guide grooves 3B opened on both sides of the notch 3D, while the clamp jaws 9 for the work W are further provided on the front surface of the main body 3. , 9 is attached, and has a fitting groove 10A in the form of an arc or a V-shaped groove into which a position opposite to the abutting portion 10A is fitted.

In the above configuration, the drawbar 2 is advanced toward the workpiece W by an actuator (not shown), and the tip of the center 5 preloaded by the spring 4 is brought into close contact with the center hole _W1 of the workpiece W via the collar 5A. , when the drawbar 2 is further advanced, the center 5 is moved by the work W due to the equivalent load of the spring 6.
is pressed towards. As the drawbar 2 moves forward, the camshaft 8 also moves forward via the mounting plate 7, and when the wedge surfaces 8A, 8A of the camshaft 8 come into contact with the root end surfaces 9A, 9A of the clamp jaws 9, 9, the root end surfaces 9A, 9A
is pushed by the wedge surfaces 8A, 8A and moves outward,
In this way, the clamp jaws 9, 9 are operated, and the tips of the clamp jaws 9, 9 are pressed against the outer diameter of the workpiece W. At the same time, the work W of clamp jyo 9,9
The fitting groove 10A of the stopper 10 is fitted in a position opposite to the abutting portion on the outer diameter, thereby ensuring the chuck of the workpiece W.

[The problem that the idea aims to solve]

In the conventional chuck device described above, the outer diameter of the workpiece W is held by a pair of clamp jaws 9, 9 and further supported by the stopper 10, so the outer diameter of the workpiece W varies with respect to the shaft. Or, the coaxiality of the center 5 and the outer diameter of the workpiece W is poor,
If the roundness of the workpiece W is poor, checking the workpiece W will cause the axis and center of the workpiece W to
This causes a misalignment with the axis of the machine, that is, the axis of rotation, and precision machining becomes impossible.

[Means to solve the problem]

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks and align the axis of the workpiece with the rotating axis. A drawbar that is moved forward and backward by a drawbar, a presser plate connected to the tip surface of the drawbar, a camshaft that is attached to the presser plate so as to be slidable in the lateral direction and has a pair of wedge surfaces formed on both sides thereof, and an upper surface of the camshaft. a cam that is slidably attached to the machine frame, is biased forward by a spring, and has a wedge surface formed on its upper surface; A pair of arc-shaped clamp jaws are each slidably inserted into the arc-shaped guide groove of the machine frame, and a pair of arc-shaped clamp jaws are inserted into the guide groove formed on the front surface of the machine frame and opened at the lower surface of the notch in the front surface of the machine frame. The root end surfaces of the pair of arc-shaped clamp jaws are in contact with the pair of wedge surfaces of the camshaft, and the rod is in contact with the wedge surfaces of the cam.

[Effect]

Based on the above outline, in the present invention, when the drawbar inserted into the main shaft is advanced by an external driving force, the camshaft advances via the presser metal, and the root end surface comes into contact with the pair of wedge surfaces of the camshaft. A pair of arc-shaped clamp jaws slide in the arcuate guide groove on the front of the machine frame in a curved direction by being pushed by the wedge surface of the camshaft, and the tip of one of the pair of clamp jaws slides in the arc-shaped guide groove on the front face of the machine frame. When it comes into contact with the peripheral surface of the end of the workpiece that passes through the notch, the root end surface of the clamp jaw pushes the camshaft in the opposite direction to the clamp jaw through the wedge surface, thus causing the camshaft to slide in that direction. The end surface of the other clamp jaw is pushed through the wedge surface, and the tip of the clamp jaw comes into contact with the circumferential surface of the workpiece end, and thus the workpiece end circumferential surface is gripped by the pair of clamp jaws, and one The rod rises as it is pushed by the wedge surface of the cam, which moves forward with the camshaft, and comes into contact with the peripheral surface of the end of the workpiece, and the rod supports the workpiece by the elasticity of the spring via the cam.

[Effect of idea]

In this invention, even if the outer diameter of the end of the workpiece varies in the axial direction, the coaxiality between the center and the outer diameter of the workpiece is poor due to the chuck mechanism that has degrees of freedom both in the lateral and vertical directions. Even if the workpiece is out of roundness, the workpiece axis can be aligned with the rotation axis and checked.

〔Example〕

The present invention will be explained with reference to an embodiment shown in FIG.
is slidably inserted into the center hole 2 of the drawbar 2.
A collar 11 is slidably inserted into A, the rod portion 5A of the center 5 is slidably inserted into the collar 11, and the collar 11 is pulled by the elasticity of the spring 4 in the workpiece W direction ( forward), and the center 5 is pushed by the elasticity of the spring 6 and the workpiece W
Forced in the direction (forward). Therefore, a force in the direction (forward) of the workpiece W is exerted on the center 5 due to the mutual elasticity of the elasticity of the spring 4 via the collar 11 and the elasticity of the spring 6 directly. The center 5 is further connected to the machine frame 3.
The drawbar 2 is pivotally supported through the shaft hole 3A of the
A mounting plate 7 is fastened to the tip surface, and the mounting plate 7
A pusher 7A is extended from the lower part of the pusher 7A, and a groove 71A having a T-shaped cross section is cut in the lateral direction on the tip surface of the pusher 7A. It is fitted. The camshaft 8 is connected to the machine frame 3
A pair of guide grooves 3 are formed on the front surface 3C of the machine frame 3 and open on both sides of the notch 3D of the front surface 3C of the machine frame 3.
It is located between the root ends of a pair of arc-shaped clamp jaws 9, 9 that are slidably inserted and guided by the cam shaft 8, and a pair of wedge surfaces 8 are provided at the tip portions of both sides of the camshaft 8.
A, 8A are formed, and root end surfaces 9A, 9A of the clamp jaws 9, 9 are in contact with the wedge surfaces 8A, 8A. Further, a cam 20 is slidably attached to the upper surface of the camshaft 8, and the cam 20 is urged forward by a spring 13. A wedge surface 20A is formed at the tip of the upper surface of the cam 20. The wedge surface 20A is attached to the front surface 3 of the machine frame 3 at an angle of 5° or less.
Guide groove 3E opened on the lower surface of notch 3D of C
It is in contact with the root end surface 21A of the rod 21 which is slidably inserted and guided.

In the above configuration, when a cylindrical workpiece W having a center hole _W1 is attached through the notch 3D in the front surface 3C of the machine frame 3, the drawbar 2 moves forward by an external driving force such as an actuator (not shown). The tip of the center 5 is brought into close contact with the center hole _W1 of the workpiece W.
Further, as the drawbar 2 moves forward, both springs 4 and 6 are compressed. As the spring 4 is compressed, its elasticity decreases, and as the spring 6 is compressed, its elasticity increases, and thus the force exerted on the center 5 in the direction of the workpiece W (forward) is The pressing force is constant.
As the drawbar 2 moves forward, the camshaft 8 also moves forward via the mounting plate 7 and the pusher 7A, and when the wedge surfaces 8A, 8A of the camshaft 8 come into contact with the root end surfaces 9A, 9A of the clamp jaws 9, 9, the root end surfaces 9A, 9A The clamp jaws 9, 9 are pushed by the wedge surfaces 8A, 8A and guided by the guide groove 3B and slide in the bending direction (arrow in FIG. The tip of one of the pair of clamp jaws 9, 9 is pressed against the diameter of the workpiece W.
When it comes into contact with the outer diameter of the clamp jaw 9, the root end surface 9A of the clamp jaw 9 pushes the advancing camshaft 8 in the opposite direction via one of the wedge surfaces 8A. The clamp jaw 9 slides in that direction through the other wedge face 8A and pushes the root end surface 9A of the other clamp jaw 9, and the tip of the clamp jaw 9 comes into contact with the outer diameter of the workpiece W. In this way, the workpiece W is a pair of clamps 9,
9. On the other hand, as the camshaft 8 moves forward, the rod 21 is pushed by the wedge surface 20A of the cam 20 and guided by the guide groove 3E and moves upward. When the tip of the rod 21 comes into contact with the outer diameter of the workpiece W, the spring of the cam 20 13 is compressed and its elasticity is transmitted to the rod 2 through the wedge surface 20A of the cam 20.
1 to the outer diameter of the workpiece W. As mentioned above, the outer diameter of the workpiece W is equally supported at three points by a rod that has a degree of freedom in the vertical direction via a cam, and a pair of clamp jaws that has a degree of freedom in a lateral direction via a camshaft. Become.

The workpiece W to which the chuck device of the present invention is applied does not have to have a cylindrical shape as a whole, but only needs to have at least a cylindrical end, and can also be applied to a workpiece W such as a crankshaft with a bent middle part. It is something that

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, where Figure 1 is a cross-sectional view and Figure 2 is a section taken along A--A in Figure 1.
A' arrow view, FIG. 3 is a B-B' arrow view in FIG. 1, FIGS. 4 to 6 show an embodiment of the present invention, and FIG. Figure 5 is a view taken along arrow A-A' in Figure 4, and Figure 6 is B in Figure 4.
−B′ arrow view. In the figure, 1... Main shaft, 2... Drawbar, 5... Center, 7... Mounting plate, 7A... Push metal, 71... Groove, 8... Camshaft, 81... Fitting projection, 8A... Wedge surface, 9... Clamp jaw, 20... Cam, 20A...wedge surface,
21... Rod.

Claims (1)

[Scope of utility model registration request] A main shaft fastened to the rear surface of the machine frame, a drawbar slidably inserted into the main shaft and moved forward and backward by an external driving force, a pusher connected to the end surface of the drawbar, and a pusher that slides laterally on the pusher. A camshaft is movably mounted and has a pair of wedge surfaces formed on both sides, and a camshaft is mounted on the top surface of the camshaft so as to be slidable back and forth, is biased forward by a spring, and has a wedge surface formed on the top surface. a pair of arc-shaped clamp jaws each slidably inserted into a pair of arc-shaped guide grooves formed on the front surface of the machine frame and opening on both sides of a notch on the front surface of the machine frame; The rod is formed on the front surface of the machine frame and is inserted into a guide groove that opens at the lower surface of the notch on the front surface of the machine frame, and the root end surfaces of the pair of arcuate clamp jaws are the wedge surfaces of the pair of camshafts. A chuck device for a workpiece, characterized in that the rod is in contact with a wedge surface of the cam.