Study on Computer-controlled Metal Powder Automatic Weighing Device
Powder metallurgy parts that burned metal powder were widely used for its special property. The density of powder metallurgy parts had a direct influence on property, while the density was depended on the weight of metal powder which was added in the forming dies. So, the weighing accuracy and efficiency is important for the manufacture of powder metallurgy parts. In order to improve the efficiency and accuracy of metal powder weighing, a precision metal powder automatic weighing device for small part which was controlled by microcomputer was designed in this paper. The device used vertical screw feeder to feed automatically, used PWM (Pulse-Width Modulation) to control feeding speed. Take account of the efficiency, accuracy and stability. After the metal powder in the storage hopper was sent to the weighing hopper, the sensors which was connected with the weighing hopper transformed weight signal into voltage signal, then sampling data would be sent to the computer system through amplifier and A/D conversion to analyze. Control the working condition of feeding, discharging and mold transmission according to the difference between the scheduled value and the current value. If that value was accurate, computer would control the transfer agency to send the mold to the bottom of electronic controlled discharge valve, and then the control valve opened to the largest, so that metal powder would be discharged quickly into the mold. When the weight of metal powder in the weighing hopper exceeded the target weight, you could control the discharge valve by opening a small mouth to discharge the excess metal powder. According to the nature of powder to improve the feeding mechanism, this system could also be used for other powder materials weighing.
Powder metallurgy Parts density Automatic weighing Feeding mechanism PWM Microcomputer control
Li Guofu Zhang jianfeng Xia Wenming Liu Guangqing Hu Zheliang
Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211 China Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, 315211 China Taizhou Voc
国际会议
沈阳
英文
479-483
2009-08-27（万方平台首次上网日期，不代表论文的发表时间）