Three-dimensional ultrasonic elliptical vibration cutting device with parallel structure and trajectory generation method

Abstract

The invention discloses a three-dimensional ultrasonic elliptical vibration cutting device of a parallel structure and a track generating method and belongs to the field of elliptical vibration assisted cutting machining. The device outputs the space three-dimensional ultrasonic elliptical vibration track by using design in a form of a flexible hinge parallel structure. The device comprises a flexible hinge parallel structure, a fixed base, a cutter pre-tightening bolt, pretensioners, piezoelectric ceramics, electrode plates, thread shafts and resonant frequency regulators. The flexible hinge parallel structure comprises tree branch hinges and a cutter mounting table; the tree branch hinges are uniformly distributed at the periphery with intervals of 120 degrees; displacement is simultaneously input into the three branch hinges and finally forms an elliptical track at a cutter point through transmission and amplification actions of the flexible hinge parallel structure. The device is simple in structure and rapid in response, is capable of easily generating the three-dimensional elliptical motion track, and can be conveniently and directly integrated with a numerically-controlled machine tool to carry out auxiliary precision machining.

Description

technical field [0001] The invention belongs to the field of ultrasonic elliptical vibration assisted cutting processing, and in particular relates to a three-dimensional elliptical vibration assisted cutting device with a parallel structure and a method for generating an elliptical trajectory. Background technique [0002] With the rapid development of precision and ultra-precision machining technology, elliptical vibration cutting has been widely concerned because of its advantages of reducing cutting force, improving machining quality, suppressing workpiece burrs, and increasing tool life. In view of the higher and higher requirements for the processing quality of high-precision parts, scholars have designed a variety of elliptical vibration cutting methods and supporting vibration cutting devices to further improve the surface quality of elliptical vibration cutting. Among various elliptical vibration cutting forms, the three-dimensional elliptical vibration cutting devi...

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Problems solved by technology

[0003] At present, the three-dimensional elliptical vibration device mainly adopts series and parallel structures. The three-dimensional elliptical vibration cutting device with the series mechanism as the carrier can effectively avoid motion coupling, but the series mechanism will cause the first-order natural frequency of the device to be low and difficult to drive.

The three-dimensional elliptical vibration cutting device based on the parallel compliant mechanism can avoid the above defects. Both the patent (CN102059575A) and the patent (CN102371359A) respectively provide a patent for a three-dimensional elliptical motion generation method and its device, although both can generate elliptical motion. track, but there are problems such as low working frequency, small working stroke, single form of elliptical track, poor adjustability of elliptical track range, etc.

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