본 연구에서는 유럽의 범례 기호 사례 중 국내 실정에 가장 적당하다고 생각되는 자료를 바탕으로, 적용, 변형, 신규제작등 3가지 유형으로 나누어 지형학도 범례 기호 개발 방안을 제안하였다. 본 연구에서 제안된 범례 및 기호는 대축척 지형도 상에서지형의 형태적 특징과 지리적 분포 특징을 개괄적으로 파악하는데 상당히 효과적일 것으로 생각된다. 아울러 본 연구 결과는 환경부 전국자연환경조사 생태지도 작성을 위한 범례 개발에 기초적인 자료로 활용될 수 있을 것으로 기대된다. 단, 본 연구에서 제안된 지형기호는 지형의 형태적 특징을 강조한 것으로, 각 단위 지형의 성인, 발달과정, 형성 시기 등을 종합적으로 판단해내기는 어렵다는 한계를 가지고 있다. 이에 대해서는 후속 연구를 통해 보완되어야 할 것으로 생각된다.

In this paper, experimental studies of the regrinding of tungsten carbide (WC-Co) tools for high-speed machining were conducted. Regrinding and a subsequent evaluation test were carried out for a flat endmill tool with diameters of 10 mm and 3 mm using a CNC five-axis tool grinder and a CNC three-axis machining center. Tool wear on the two types of endmill tools increased as the cutting length increased, and the tool wear was not influenced by the regrinding state. In case of the micro endmill with a tool diameter of 3 mm, the effective regrinding time was determined for a flank wear threshold of 0.3 mm considering the tool life according to cutting length. The tool lives of the 10 mm and 3 mm endmill tools were increased by 80% and 72%, respectively. This conclusion proves the Feasibility of the recycling of tungsten carbide materials in the high-speed machining of high-hardened materials for industrial applications.

To satisfy the demand of higher cutting performance, mechanical properties with tungsten carbide (WC-Co) tool materials were investigated. Hardness and transverse rupture strength with WC grain size, Co content and density were measured. Compared to H, K, and S manufacture maker as tungsten carbide (WC-Co) tool materials were used for high-speed machining of end-milling operation. The three tungsten carbide (WC-Co) tool materials were evaluated by cutting of STD 11 cold-worked die steel (HRC25) under high-speed cutting condition. Also, tool life was obtained from measuring flank wear by CCD wear measuring system. Tool dynamometer was used to measure cutting force. The cutting force and tool wear are discussed along with tool material characteristics. Consequently, the end-mill of K, H manufacture maker showed higher wear-resistance due to its higher hardness, while the S maker endmill tool showed better performance for high metal removal.