The Design And Research Of Ultrasonic Torsional Vibration Boring System

Precision deep hole processing for difficult-to-machine materials is still a problem. Thetraditional method of lathe boring, owing to the boring cutter structure has its limitations. It isextremely difficult to enhance the precision and surface quality of the processed hole. Theemergence of ultrasonic vibration boring make deep holes, especially difficult to machiningmaterials precision deep hole machining quality has a qualitative leap. Our team has done alot of experiments on ultrasonic torsional vibration boring, and has got ideal effects. However,we found that boring system still exists shortages, which influence the effect of the boringhardly. This paper is to analyze the defects of boring system, design and manufacture a newsystem of ultrasonic vibration boring. Through debugging we realized the improvement ofultrasonic vibration boring system and its technique.The reasons affecting system works gotten by analyzing research on it is as follows: Thelathe wear decreased accuracy seriously; The output waveform of ultrasonic generator wasanamorphic; The embedded mode and connection mode on the joint between vibrationsystem’s transformer rod and the boring cutter arbor were unreasonable. It affected thesystem’s precision and rigidity, which make loading and unloading inconvenient; Theposition of amplitude transformer and the understructure was very unreasonable. It only relyon bolt to bear axial force, which limited its stiffness seriously; For deep hole processing,boring cutter bar was over-hanged longer. The low connection rigidity of cutting tool and theamplitude transformer affect the processing quality seriously. This experiment improved thedefects of existing system. First of all, purchased new lathe, generator, transducer, debuggedand then make debugging and modification. Second, improved the unreasonable structure ofthe joint among amplitude transformer with support, boring cutter bar with amplitudetransformer. Changed the original structural position that stents in the former, flange in thelater. Designed a removable support frame for the of boring bar. The problem of rigidity shortage derived from bolt bearing axial force and the over-longed boring cutter have beensolved. The connection between boring cutter bar and amplitude transformer has beenreplaced by boring cutter bar embedding in luffing rod way, not the original embedded mode.Switched the boring cutter rod fastening way to use long bolt penetrate the amplitude oftorsional vibration to tighten it. And designed support flange use for support in the boringcutter rod taper. Thirdly, designed and manufactured the torsion, axial ultrasonic transformers,boring tool system, support. Then debugged and redesigned them carefully. In the final, thereliable and efficient ultrasonic torsional vibration boring system has been achieved.