JPH0222167Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an indexing chuck for a machine tool that processes a workpiece while performing predetermined indexing in stages.

[Conventional technology]

Indexing chucks that perform predetermined indexing step by step during rotation are already known, for example,
It is disclosed in the specification of No. 49583. This is the third
4, FIG. 3 shows a cross-sectional view of the main part of the overall view of the spindle system, and FIG. 4 is a cross-sectional view taken in the direction of the arrow in FIG. FIG. The indexing chuck 1 is fixed to a spindle 2 of a machine tool (not shown) via a face plate 5. The spindle 2 is provided with a pressure oil distribution device 3 at its rear end, which receives pressure oil from a hydraulic unit consisting of a hydraulic pump, an electric motor, a tank, etc. (not shown), and supplies the index chuck 1 via an oil pipe 4. Pressure oil is supplied to the indexing mechanism 10, and by switching an electromagnetic switching valve (not shown), the main plunger 12 and the auxiliary plunger 13 alternately act on the indexing surface 11a of the square piece 11, and the stage of the workpiece W is changed. Further, the pressure oil supplied to the clamp mechanism 9 operates the clamp piston 16 to clamp the workpiece W between the clamp claws 7 and 8. 6 is the chuck body of the indexing chuck 1, and 14 and 15 are the lids of the main plunger 12 and the auxiliary plunger 13, respectively. As an example of other indexing chucks,
There are issues such as No. 196155.

The above is an overview of known indexing chucks. When machining flat surfaces or deep holes in a workpiece, for example when machining pipe joints, depending on the workpiece, the location to be clamped may be regulated depending on the shape of the workpiece, and machining resistance applied to the workpiece may be restricted. Since the workpiece often acts from the other direction, conventional indexing chucks may not be able to adequately support the workpiece and may cause misalignment. In such a case, machining becomes impossible or the workpiece becomes inaccurate. As a countermeasure to this problem, it is possible to increase the clamping force by increasing the hydraulic pressure or by increasing the bore diameter of the cylinder of the clamping mechanism, but each has its limits, and in the case of the former, the hydraulic system may be used more than necessary. In the latter case, the chuck itself becomes large, which necessitates an increase in the size of the main shaft, etc. For such workpieces, measures can be taken such as reducing the depth of cut to minimize machining resistance, or using a separate single-function machine to perform only machining with high machining resistance, such as deep hole machining. However, there are problems in that they are inefficient and it is difficult to achieve accuracy when changing the chuck.

[Problem that the invention attempts to solve]

The present invention eliminates the drawbacks of the prior art and provides an indexing chuck for a machine tool that is fully applicable to machining with high machining resistance.

[Means for solving problems]

The present invention has two replaceable clamp claws 10.
7, 108, and is fitted slidably in the radial direction of the chuck body 106.
one clamp claw 107 is rotatably supported on the
In the indexing chuck 101, the square piece 11 of the indexing mechanism 10 for indexing the workpiece _W1 is provided with the other clamp claw 108, which is slidable in a direction substantially perpendicular to the sliding direction of the clamp piston 104. A booster piston 10 provided in the chuck body 106
3, when clamping the workpiece _W1 with force, the sloped surface 104b formed on the shaft end 104a of the clamp piston 104 and the sloped surface 103b formed on the shaft end 103a of the force multiplier piston 103 are engaged. , the shaft end 104a of the clamp piston 104
a force increasing mechanism 105 that presses the force increasing mechanism 105; a detector 115 that detects clamping of the workpiece _W1 by sliding of the force increasing piston 103;
The indexing chuck 101 is equipped with a detector 114 that detects the unclamping of the workpiece W1 by the sliding of the workpiece _W1 .

〔Example〕

FIG. 1 is a front view of an indexing chuck 101 showing an embodiment of the present invention, and shows a state before clamping a workpiece _W1 . FIG. 2 is a side view of FIG. 1. The cross-sectional view taken along arrow A in FIG. 1 is shown in FIG. 4, and is shared with the cross-sectional view taken along arrow A in FIG.

Chuck body 106 of indexing chuck 101
is attached to a face plate 119 attached to the front surface of the spindle 102 by bolts 118. When the rotation of the spindle 102 is stopped, the clamp claw 108 is stopped at a lower position by a control of a drive source and a positioning device (not shown).
By hand loading onto the clamp claw 108, or
The workpiece W ₁ is placed on the loader device, the clamp piston 104 is slid downward by pressure oil, and the workpiece W ₁ is pressed and clamped by the clamp claw 107 rotatably supported by the clamp piston 104. . In order to detect whether the clamp has been released, a pin 112 is implanted in the upper end surface of the clamp piston 104, and a detector 114 for detecting the position of the pin 112 is attached to the outside of the chuck body 106. After completion of clamping by the clamp piston 104, the force booster piston 103 provided perpendicularly to the sliding direction of the clamp piston 104 is slid with pressure oil, and the slope surface 104b of the shaft end 104a of the clamp piston 104 and the force booster piston 1 are slid.
The shaft end 10 of the clamp piston 104 is engaged with the inclined surface 130b of the shaft end 103a of the clamp piston 103.
4a downward to increase the clamping force of the clamp piston 104. During force boosting clamping, since hydraulic pressure is acting on the force boosting piston 103, a clamping force approximately 2.5 times that of the conventional clamping force is exerted in this embodiment due to the wedge action of the slope surfaces 103b and 104b. A pin 113 is implanted on the piston side end surface of the booster piston 103, and a detector 115 for detecting the position of the pin 113 is provided outside the chuck body 106 to detect whether or not it is clamped. The spindle 102 is rotated by the indexing mechanism 10 for each machining process of the workpiece _W1 .
Indexing is performed during the rotation of the workpiece, and this indexing mechanism 10, as explained in FIG. In this method, W ₁ is determined in stages.

116 is a clamp mechanism 109 and a force increasing mechanism 1
05 and 117 are communicating holes for communicating with the indexing mechanism 10 for supplying and recovering pressure oil, and are in communication with an oil feed pipe 120, respectively. 1
21 and 122 are lids of the clamp mechanism 109 and the force increasing mechanism 105, respectively. detector 114,
115 are provided to check whether the clamp mechanism 109 and the force booster mechanism 105 are operating normally.If there is any abnormality in the clamp or force booster mechanism, the machine will be stopped to prevent damage to tools, chucks, etc. Prevent machining defects on workpieces. No matter which direction the workpiece W ₁ receives machining resistance during machining, the clamp piston 1
The clamping force of 04 does not loosen and can grip the workpiece twice as much as the conventional clamping force. Also,
If the operation of the force increasing mechanism is locked with a lock bolt (not shown), it can be applied to clamping thin-walled workpieces that do not require strong clamping force. In this case, detection of clamping and unclamping is performed by detector 114.
Do it with According to the indexing chuck of the present invention, not only can a wide variety of workpieces be machined, including complex workpieces such as valves and workpieces that receive large cutting forces during turning, but it can also be used in combination with an autoloader, etc. Unmanned operation is possible and high productivity can be achieved. Moreover, it has excellent safety features such as preventing machine accidents.
It is compact and has strong clamping force without increasing the chuck size, making it highly economical.

[Effect of idea]

Due to the shape of the workpiece itself, the clamping jaws 10
This is particularly effective when the support provided by the 7 and 108 is limited or when the workpiece shifts or floats due to high machining resistance, and the drawbacks of the prior art can be solved at once. In addition, a wide variety of workpieces can be processed without upgrading the conventional chuck size, improving productivity. The production cost is low, and it is safe and economical.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a cross section of an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1. FIG. 3 shows, in cross section, a typical conventional indexing chuck attached to a spindle. Figure 4 shows A in Figure 1.
The sectional view taken in the direction of arrows and the sectional view taken in the direction of the arrows in FIG. 3 are shared. 10... Index chuck, 11... Square piece, 1
1a... Indexing surface, 12... Main plunger, 13
... Auxiliary plunger, 101 ... Index chuck, 102 ... Spindle, 103 ... Lock piston, 104 ... Clamp piston, 103
a, 104a... shaft end, 103b, 104b...
...Grand surface, 105...Lock mechanism, 106...Chuck body, 107, 108...Clamp claw.

Claims (1)

[Scope of Claim for Utility Model Registration] It has two replaceable clamp claws, one clamp claw is rotatably supported on a clamp piston that is slidably fitted in the radial direction of the chuck body,
In an indexing chuck in which the other clamp claw is provided on the square piece of an indexing mechanism for indexing a workpiece, a force increasing force provided on the chuck body is slidable in a direction substantially perpendicular to the sliding direction of the clamp piston. When the piston is force-intensifying clamping a workpiece, a sloped surface formed at the axial end of the clamp piston and a sloped surface formed at the axial end of the force-increasing piston are engaged with each other, so that the axial end of the clamp piston is tightened. A force increasing mechanism for pressing, a detector for detecting clamping of the workpiece by sliding of the force increasing piston, and a detector for detecting unclamping of the workpiece by sliding of the clamp piston. Features an indexing chuck.