Investigation On Driling Engineering Ceramics With A Disigned Muti-frequency Rotary Untiasonic Maching System

Engineering ceramics are widely used in aerospace,shipbuilding,electronic instrument manufacturing and other fields because of their excellent mechanical properties such as high strength,high hardness and wear resistance.However,engineering ceramics are hard and brittle materials with high hardness,high brittleness,and low fracture toughness.In the subsequent processing,there are problems such as complex procedures and severe tool heating,which limit the promotion and use of engineering ceramics.Ultrasonic processing is an effective method for processing hard and brittle materials such as engineering ceramics.However,traditional ultrasonic processing cannot meet the requirements of industrialized mass production due to the small amplitude of the output end and low processing efficiency.After improving the rotating structure of the ultrasonic equipment,the original processing efficiency can be improved.This paper studies and designs and manufactures a set of rotary ultrasonic machining unit,which provides a machine tool for drilling the engineering ceramics by combining with CNC machine tools.The main research contents and conclusions of this paper are as follows:1.By studying the movement characteristics of the free mass and establishing the hard and brittle material removal model,the influence of the introduction of the free mass on the processing efficiency of engineering ceramics is studied.The results show that the free mass effectively improves the processing efficiency by adding low-frequency and large-scale vibration on the basis of the original ultrasonic processing.2.Through simulation calculation and optimization of the structure,the conical amplitude transformer that resonates with the 40 k Hz transducer is processed.3.After referring to the structure of the rotating ultrasonic machining system,the free mass structure of the multi-frequency ultrasonic is added to complete the preliminary design of the mechanical structure of the equipment;by selecting suitable materials,using software to perform finite element simulation of the ultrasonic amplitude transformer and drill rod,using three-dimensional design software to model and analyze the overall equipment,design and process a set of multi-frequency rotary ultrasonic unit.4.Through laser cladding treatment of the drill rod,the hardness is improved.Using the designed multi-frequency rotating ultrasonic system to conduct single-factor processing experiments on alumina engineering ceramics,the best process parameters under the existing equipment conditions were obtained,and the expected design requirements of the system were achieved.