Self-centering four-jaw independent chuck

Abstract

The invention relates to a self-centering four-jaw chuck, which comprises a chuck body, a group of clamping jaws consisting of four clamping jaws, and lead screws corresponding to the clamping jaws one by one, wherein bonded blocks at the front end of a positioning shaft on the chuck body are slidably connected with annular spacing grooves of the lead screws. The self-centering four-jaw chuck is characterized in that two opposite lead screws of the lead screws are set to be an integrated single lead screw; threads at both ends of the single lead screw are set to be levorotatory and dextrorotary respectively; and threads on the clamping jaws and the correspondingly meshed lead screws are set to be levorotatory and dextrorotary. The self-centering four-jaw chuck has the advantages that the self-centering four-jaw chuck is modified on the basis of the prior chuck structure, has a simple structure, can clamp various parts with different shapes, has independent and single two jaws, and realizes free centering and fine adjustment; the self-centering function of the two opposite jaws can be realized by adjusting the single integrated lead screw; asymmetric workpieces can be clamped as long as the eccentric distance of the asymmetric workpieces and the screw pitch of the lead screws are multiple proportional, so that automatic centering is realized; and the work efficiency can be improved by 30 percent during processing.

Description

technical field [0001] The invention belongs to workpiece chucks for machining, in particular to a self-centering four-jaw chuck. Background technique [0002] At present, the workpiece chuck used for cutting machine tools has a three-jaw self-centering chuck, which is only suitable for clamping the cutting bar. The four-jaw single-action chuck includes a disc body, four lead screws, and a pair of jaws. When working, the four lead screws are used to drive the four jaws respectively. Therefore, the common four-jaw single-action chuck has no automatic centering function. However, various rectangular and irregular workpieces can be clamped by adjusting the positions of the four jaws, and each jaw can move independently. It is generally suitable for small batch cutting of parts with different shapes of clamping outer diameter; even though the universal chuck manufactured and used in recent years has two clamping functions of self-centering clamping and single-action clamping, i...

AI Technical Summary

Problems solved by technology

[0002] At present, the workpiece chuck for cutting machine tools has a three-jaw self-centering chuck, which is only suitable for clamping the cutting bar.

The four-jaw single-action chuck includes a disc body, four lead screws, and a pair of jaws. When working, four lead screws are used to drive the four claws respectively. Therefore, the common four-jaw single-action chuck has no automatic centering function.

It is generally suitable for small batch cutting of parts with different shapes of clamping outer diameter; even though the universal chuck manufactured and used in recent years has two clamping functions of self-centering clamping and single-action clamping, it is not suitable for irregular workpieces. In mass production, there are still defects such as unstable centering, small adjustment range, and inconvenient operation, and the above-mentioned universal chuck has complicated manufacturing process and structure, high cost, and is not easy to popularize

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