Study of Efficiency of Drilling Hole by Using EDM Process of Weld on AISI P20 Tool Steel บทความวิจัย

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สมชาย วนไทยสงค์
เอนก สุทธิฤทธิ์
เอกชัย รอดพิสา
เถลิง พลเจริญ
พิชัย จันทร์มณี

Abstract

This research aims to study the optimal factors for drilling hole in the process of electrical discharge machining (EDM). The specimens was tool steel grade AISI P20 which was repaired by welding of shield metal arc welding (SMAW) and gas metal arc welding (GMAW). Tool electrode in the experimental testing was the brass and copper. The discharge current was adjusted 3 levels consisted of 2.5, 3 and 3.5 Ampere in order to evaluated material removal rate (MRR), electrode wear ratio (EWR), roughness of machined surface (Ra) and appearance of entrance and exit of drilled hole, respectively. The experimental results were found that the electrical discharge machining for drilling hole with brass electrode on the welded specimen of shield metal arc welding (SMAW) had the highest materials removal rate of 22.439 mm2/min and electrode wear ratio of 90 percentage at the discharge current of 3 Ampere. The lowest roughness of machined surface on the specimen of gas metal arc welding (GMAW) by approximately 4.0198 micrometer occurred at the discharge current of 3.5 Ampere with the copper electrode. The characteristic of drilled hole for both welded specimens were found that the dimensional of entrance hole was larger than 1 millimeter and exist hole was smaller than 1 millimeter for any level of discharge current. 

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References

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