JPS63288607A - Device for fixing tailstock spindle to tailstock main unit - Google Patents

Abstract

PURPOSE:To surely and firmly fix a long-sized workpiece and to promote the improvement of its machining accuracy, by providing a fixing ring, which is actuated by hydraulic or pneumatic pressure having a tapered part, to be interposed between the tailstock main unit of the conventional tailstock fixing device and its tailstock spindle. CONSTITUTION:A cylinder part 9, into which a tailstock spindle fixing ring 8 is movably pressed, is provided being arranged between a tailstock main unit 1 and a tailstock spindle 2. Here the tailstock spindle 2, when it is advanced, is protruded by applying hydraulic or pneumatic pressure from a fluid passage 7. And when the tailstock spindle 2 is adapted to a workpiece, the fixing ring 8 is advanced by the hydraulic or pneumatic pressure, introduced from a fluid passage 5, firmly fixing the tailstock spindle 2 to the tailstock main unit 1 by the action of a tapered part of the ring 8. Next, when the tailstock spindle 2 is retracted, hydraulic or pneumatic pressure is applied to a tailstock spindle-unclamping fluid passage 4 and a retracting fluid passage 6. In this way, deflection of the tailstock spindle 2 is less suppressed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for fixing a tailstock shaft of a valve stand used in a lathe in order to improve the machining accuracy of long parts in lathe machining. Regarding equipment.

[Conventional technology]

As shown in Fig. 2, the tailstock shaft of conventional lathes has a tailstock main body 1.
A rotation center 3 is fixed in a tapered shape to the tip of the heart valve stand 2 attached to the tailstock, and in order to move the tailstock 2 forward, pressurized oil or compressed air is inserted into the rear end of the tailstock from the lower. By inserting it, the tailstock shaft is advanced until it hits the workpiece.

It was fixed to a protruding hole using only hydraulic or air pressure.

[Problem that the invention seeks to solve]

In the conventional cardiac axis fixing means as described above.

If the protrusion stroke of the tailstock is long (when machining an irregularly shaped workpiece, the rotational runout due to the deviation of the center of gravity of the workpiece will cause runout by the gap between the tailstock shaft and the tailstock body, reducing the accuracy of the workpiece) This was the cause of not appearing.

The present invention provides a tailstock shaft fixing device that solves the above-mentioned problems by using the basic valve stand structure of the prior art as it is and modifying a part of the structure.

Means for Solving Problem C] The present invention has been made in view of the above situation, and while utilizing the conventional heart valve stand fixing device as is, it has particularly newly improved the structure between the tailstock body and the tailstock shaft. Operates hydraulically or pneumatically. A tapered fixing ring is interposed, and the pressure applied to the fixing ring further secures the heart valve shaft.

[Effect]

The above-described device for fixing the cardiac valve shaft of the present invention combines the working force for fixing the workpiece due to the pressurizing force from the rear end of the cardiac valve shaft of the prior art and the pressurizing force applied to a newly specially provided fixing ring with a taper. Through its action, the workpiece is fixed more reliably and firmly by the valve shaft, which is useful for improving the machining accuracy of long parts in lathe machining.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1, but it goes without saying that the present invention is not limited to this embodiment. Fig. 1 shows the present invention applied to a heart valve stand of an NC lathe, in which a heart valve shaft 2 installed in a heart valve stand main body 1 has a trap rotation center 3 fixed at one end by a part of the taper, and the heart valve shaft 2 is installed in a heart valve stand body 1. In order to move the valve shaft 2 forward toward the workpiece, hydraulic pressure or air pressure is introduced to the other end of the valve shaft to cause the valve shaft 2 to protrude. These structures are completely the same as those of the prior art shown in FIG. A cylinder portion 9 is provided in which a ring is inserted so as to be movable left and right in the axial direction.

To advance the heart valve shaft 2, hydraulic or pneumatic pressure is applied to the rear end from the fluid passage 7 to cause the heart valve shaft to protrude, and when the heart valve shaft hits the workpiece, hydraulic or air pressure introduced from another fluid passage 5 is applied to the rear end. acts on the back side of the fixing ring, the heart valve shaft fixing ring 8 moves forward, and due to the action of a part of its taper, the heart valve stand main body 1 and the heart valve shaft 2 are firmly fixed by the fixing link 8. Fixed.

When the heart valve shaft 2 is retracted, the heart valve shaft 2 is clamped by applying hydraulic or pneumatic pressure to both the hydraulic pipes of the fluid passage 4 for unclamping the heart valve shaft and the fluid passage inlet 6 for retracting the heart valve shaft. Retreat while canceling the condition.

This releases the attachment of the workpiece to the lathe.

〔Effect of the invention〕

As described above, the valve shaft fixing device of the present invention provides the following effects.

(1) The basic structure of the Shinshin stand can be used without changing the conventional configuration, and a new device for fixing the Shinshin axis can be added to it by simple modification.

■ The conventional valve shaft fixing means and the fixing means of the present invention can be used in common by hydraulic or pneumatic pressure.

The fixing force is significantly increased, and the runout of the valve shaft is kept to an extremely low level compared to conventional means, making it useful for significantly improving the machining accuracy of workpieces, especially long parts.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a conventional heart valve shaft fixing device. DESCRIPTION OF SYMBOLS 1... Heart valve stand body, 2... Heart valve shaft, 3... Rotation center, 8... Heart valve shaft fixing ring, 9... Part of cylinder.

Claims (1)

[Claims] In order to fix the tailstock shaft in a lathe to the tailstock body, a tapered fixing ring that can be moved in the axial direction by hydraulic or pneumatic pressure is inserted between the tailstock shaft and the tailstock body. Features a tailstock shaft fixing device.