Umbrella-parallel-structure three-dimensional ultrasonic elliptic vibration cutting device and track generation method

Abstract

The invention discloses an umbrella parallel elliptic vibration auxiliary cutting device and an elliptical track generation method, and belongs to the field of the elliptic vibration auxiliary cutting process. A design of a three flexible hinge branch parallel umbrella configuration structure is employed, and the umbrella parallel elliptic vibration auxiliary cutting device is composed of an umbrella parallel flexible hinge structure, folded plates, a support plate, a cushion block, cutter pre-tightening screws, five inner hexangular fastening screws, piezoelectric ceramics, electrode slices, threaded rods, frequency modulation nuts, positioning nuts and fastening nuts. The umbrella parallel flexible hinge structure is formed by three branches which are uniformly distributed on the conical surface and meet at 120 degrees, and a cutter mounting table, displacement is input on the three branches at the same time, by means of the transmission and amplification effect of the umbrella parallel flexible hinge structure, an elliptical track is formed on the tool nose finally. The umbrella-parallel-structure three-dimensional ultrasonic elliptic vibration cutting device is advantaged in that the device is simple in structure and high in resonant frequency and can generate the three-dimensional elliptic motion track easily, and can be directly integrated with a numerical control machine tool conveniently to carry out auxiliary precision processing.

Description

technical field [0001] The invention belongs to the field of ultrasonic elliptical vibration assisted cutting processing, in particular to an umbrella-shaped elliptical vibration assisted cutting device and an elliptical trajectory generation method. 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 device can realize the generation of elliptical t...

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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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