Variable dimension vibrating auxiliary drilling device and track generation method

Abstract

The invention discloses a variable dimension vibrating auxiliary drilling device and a track generation method, and belongs to the field of numerical control machining. The device is composed of an amplitude-change pole, a piezoelectric transducer, a connecting sleeve, a cutter mounting structure, a machine tool mounting cutter handle and a sliding ring. The device is connected with a machine tool spindle through the machine tool mounting cutter handle; the amplitude-change pole adopts a one fourth wavelength conical step type composite amplitude change mode; the piezoelectric transducer adopts a longitudinal bending vibration sandwiching mode and is composed of piezoelectric ceramic pieces, electrode plates, a rear end cover (a reflex housing), insulation spacers and a pretightening force bolt which are connected through the pretightening force bolt in a fastened mode; the amplitude-change pole is connected with the piezoelectric transducer through a pretightening force bolt and connected with the cutter handle through the sleeve; and the sliding ring is connected with the sleeve through a catch bolt, and thus the whole structure of the device is formed. A cutter is fixed to the cutter mounting structure, one-dimensional, two-dimensional and three-dimensional elliptic track output is generated in the position of a cutter nose under control of drive signals of the piezoelectric transducer. The device is simple, stable three dimensional elliptic motion tracks can be generated conveniently, and the device can be directly integrated with numerical control machining machine tools for auxiliary precision drilling machining.

Description

technical field [0001] The invention belongs to the field of numerical control machining, in particular to the field of a variable-dimensional vibration-assisted drilling device and a trajectory generation method. Background technique [0002] At present, composite materials are widely used in the aerospace field. Due to the laminated structure and anisotropy of composite materials, problems such as delamination, tearing, and difficulty in controlling roundness occur during drilling. In addition, the high Characteristics such as hardness, high strength and poor thermal conductivity can easily lead to severe tool wear, poor processing quality, low processing efficiency and high processing cost. Vibration-assisted cutting has obvious advantages in reducing cutting force, improving processing quality, suppressing workpiece burrs and delamination, and increasing tool life. It has been applied to composite material drilling. One-dimensional vibration machining In view of the hig...

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Problems solved by technology

[0004] The patent (CN103406568B) designed an auxiliary air drill based on ultrasonic vibration can only realize the generation of axial vibration trajectory, and the vibration frequency is low, which cannot meet the processing requirements of composite materials; the patent (CN105499626A) designed a composite vibration drilling Although the device can realize the generation of torsional vibration and axial vibration trajectory, it also has the defects of low vibration frequency and small amplitude, and its adaptability to composite material processing is poor.

The patent (CN105478332A) provides a longitudinal torsional resonance ultrasonic vibration device, although the vibration frequency is increased and the torsional vibration trajectory can be generated, but the chute-type horn used in it cannot independently adjust the amplitude of axial vibration and torsional vibration amplitude, the two are coupled with each other, and variable dimension drilling cannot be realized

In addition, most patents only mention two-dimensional elliptical vibration, and seldom involve three-dimensional composite vibration, and few people study the variable-dimensional vibration drilling auxiliary device

[0005] In order to overcome the shortcomings of the existing technology and solve the problems of vibration coupling, low vibration dimension and inability to adjust the parameters of the drilling device in the current vibration-assisted drilling device, a variable-dimensional vibration-assisted drilling device and trajectory generation method are designed.

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