Journal of the Korean Society for Precision Engineering (한국정밀공학회지)
- Volume 13 Issue 7
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- Pages.36-44
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- 1996
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
A Study on the Machinability Characteristics of ADI Materials for the Drilling Conditions
ADI재료의 드릴가공시 가공조건에 따른 절삭특성에 관한 연구
Abstract
Drilling tests were carried out austempered ductile cast iron(ADI) to clarify the factors influencing the drilling characteristics of ADI material. The machinability of material was evaluated using high speed steel drill and cobalt contained drill of 6mm diameter. The spheroidal graphite cast iron materials were austemized at 900 .deg. C for 1 hour and then wear was kept at 375 .deg. C for 2 hours. Austempered ductile cast iron contains a great deal of retained austenite which contribustes to an improvement of impact strength. In this paper, machinability of ADI was invastigated by drilling experimentation. The results obtained are as follows:a) Flank wear incresses logarithmically with the increases of cutting time and proportionally with the increases of cutting force. b) Drilling hole number of about 2 times can be educed more step feed than ordinary feed due to the high hardness of ADI material and hardness increasing ascribed to the martensite of retained austenite.
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