Design of acoustical system of cellphone screen abrasive impacting machining

TENG Zhi-jun
（The Metalwork Division，Chint Electrics Co.，Ltd.， Wenzhou 325603， China）

Abstract： Aiming at a complicated shape，high processing accuracy and big brittle materials of cellphone screen，the abrasive impacting machining was used to solve the difficulty in machining cellphone screen. According to den principle of solid horn，acoustical system of machining apparatus was analyzed in theory and its mathematical model was established，the conical horn and tool with large dimension rectangular section were designed. The impedance characteristic and resonant frequency of the horn was tested with HP4294A impedance analyzer. Model analysis of the tool and acoustical system was made with ANSYS finite element analysis software. The results of analysis indicate that the impedance characteristic and resonant frequency of horn are 54.36 Ω and 19.9 kHz，resonant frequencies of the tool and acoustical system are 19.858 kHz and 20.185 kHz，and acoustical system is satisfied with designing and operating requirement.
Key words： cellphone screen； abrasive impacting machining； conical horn； rectangular tool