麦克风海绵套自动挖孔装置设计

Design of U-shape Hole Forming Machines for Microphone Sponge Covers

针对目前加工麦克风海绵套主要靠手工完成而造成的效率低且产品质量不高等缺点,本文提出将手工生产方式改成流水线自动化生产,利用输送带、机械手臂及控制系统对其进行控制,以缩短平均加工时间,提高生产效率;同时利用气缸驱动挖孔电热丝,把电热丝的运动轨迹由原先的弧线运动变为简单的上下直线运动,运动轨迹与内孔母线方向平行,提高内孔边缘处的切割质量,缩短电热丝熔切海绵套的时间;并设计了一套离心式夹具,改善海绵在挖孔时受力不均匀,有效解决海绵套内壁出现条纹的技术难题,实现海绵套的自动定位和夹紧,最后对麦克风海绵套自动挖孔装置整体结构进行了设计.实验数据显示:麦克风海绵套挖孔速率为60个/min,产品内孔孔径尺寸精度为0.25 mm,明显优于手工的加工速率(40个/min)及精度(1 mm).

In view of the low production efficiency and unsatisfactory quality of the microphone sponge covers as a result of handcrafting, this paper proposes changing the manual production method to automatic production line using conveyor belts, mechanical arms and control systems to control the process so as to shorten the average processing time and improve the production efficiency. In the meantime, it is proposed that by using the air cylinder to drive hole digging heating wire the trajectory of the electric wire be changed from the original arc motion into lineal vertical motion, so that its motion trajectory is parallel to the direction of the inner hole of the generatrix, the inner hole edge cutting quality is improved, and the time of sponge cutting by heating wire is shortened. Also, a set of centrifugal jigs is designed to solve the uniform loading on the sponge in the hole-digging process and the technical problem of streaks occurring in the inner wall of the sponge covers and realize the automatic positioning and clamping of the sponge covers. Finally, the overall structure of the microphone is designed. Experimental data show that the holing rate is 60/min and the hole diameter of the product is 0.25 mm, superior to the manual processing rate （40/min） and precision （1 mm）.