Workpiece clamping and returning device of numerical control machine tool

Abstract

The invention discloses a workpiece clamping and returning device of a numerical control machine tool. The workpiece clamping and returning device comprises a spindle and a hydraulic cylinder, wherein a spring chuck push rod is arranged in the spindle; a spring chuck, a spring chuck push sleeve and a spindle nut are arranged at the front part of the spindle; the front end of the spring chuck push rod is propped against the spring chuck push sleeve; the hydraulic cylinder is mounted on a spindle box of the spindle; a bearing, a shift block and an adjustable belleville spring are arranged sequentially at the rear part of the spindle from front to back; the shift block is clamped and fixed with the tail part of the spring chuck push rod; a piston of the hydraulic cylinder is propped against the bearing. The workpiece clamping and returning device is simpler in structure, the spring chuck push rod and the spring chuck push sleeve are more convenient to operate, the probability of claw breaking in the structure in the prior art is low, the costs of parts are reduced, the structural reasonability is high, meanwhile, the device has both the clamping and automatic push rod loosening effects which cannot be realized by the conventional device, and faults of the device are reduced.

Description

technical field [0001] The invention relates to the technical field of machine tool component manufacturing, in particular to a workpiece clamping and returning device for a numerically controlled machine tool. Background technique [0002] The existing clamping device of CNC machine tools is mainly composed of a movable jaw push sleeve, a rotatable jaw push sleeve sleeve coaxially installed on the main shaft with the bearing, and a jaw fixed on the other end of the jaw push sleeve. The frame and the jaws are installed inside the main shaft and directly contacted with the jaws is the collet push rod. like image 3 Shown is the structural diagram of the workpiece clamping device. When working, first place the prepared workpiece raw materials in the spindle, and then add compressed air to the air inlet A, and drive the cylinder piston to move backward while pulling the shift fork to make the shift fork The other end of the claw push sleeve is moved to move the claw push sleev...

AI Technical Summary

Problems solved by technology

During use, it was found that when the other end of the claw is moved by the spring collet push rod to clamp, the claw needs to be under stress for a long time, which is prone to breakage

After the cylinder returns to its position, the claws are in a relaxed state. Since the gap between the push rod and the spindle is too small for high-speed rotation, the push rod inside the spindle cannot automatically release the workpiece by the expansion force of the collet after processing parts for a long time, so it cannot be pushed. Rod automatic return function

Moreover, the manufacturing process of the claw fixing frame is too complicated, and a pair of bearings in the claw push sleeve jacket are high-speed bearings, the price is too high, and the overall structure is complicated

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