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我厂生产的WY160挖掘机阀体,工作压力是320～340kg/cm~2,材料为高强度铸铁(HT30～54),结构复杂,技术要求较高。我厂原采用机械振动法清砂,效果不好,严重影响液压元件的质量和使用寿命。现利用一台电镀用的GDA500/0～16型硅整流器,制成一套小型电化学清砂装置来清砂,效果良好。一、电化学清砂原理电化学清砂是利用电化学理论发展起来的清砂工艺。铸件表面的粘砂主要是SiO_2,通过碱液(NaOH)煮沸,发生下列反应:2NaOH+SiO_2=Na_2SiO_3+H_2O来达到清砂目的。当熔融的碱液中通直流电,铸件接负极,熔槽接正极,碱液发生离解:钠离子(Na~+)向
The WY160 excavator valve body produced by our factory has working pressure of 320 ~ 340kg / cm ~ 2 and material of high strength cast iron (HT30 ~ 54). The structure is complex and the technical requirements are high. I plant the original mechanical vibration sand, the effect is not good, seriously affecting the quality of hydraulic components and service life. Now use a plating GDA500 / 0 ~ 16 silicon rectifier, made of a small electrochemical sand cleaning device to clear the sand, the effect is good. First, the principle of electrochemical sand cleaning Electrochemical sand cleaning is the use of electrochemical theory developed sand technology. The sticky sand on the casting surface is mainly SiO 2, boiled through the lye (NaOH), the following reaction occurs: 2NaOH + SiO_2 = Na_2SiO_3 + H_2O to achieve the goal of sand removal. When the molten lye through the DC, the cast then negative, melting tank connected to the cathode, lye dissociation occurs: sodium (Na ~) to