A commercial AA1070 alloy for electrical wire is severely deformed by drawing process in which a rod with an initial diameter of 9mm into is reduced to a wire of 2mm diameter. The drawn AA1070 wire is then annealed at various temperatures from 200 to 450 oC for 2h. Changes in microstructure, mechanical properties and electrical properties of the specimens with annealing temperature are investigated in detail. The specimen begins partially to recrystallize at 250 oC; above 300 oC it is covered with equiaxed recrystallized grains over all regions. Fiber textures of {110}<111> and {112}<111> components are mainly developed, and {110}<001> texture is partially developed as well. The tensile strength tends to decrease with annealing temperature due to the occurrence of recovery or/and recrystallization. On the other hand, the elongation of the annealed wire increases with the annealing temperature, and reaches a maximum value of 33.3 % at 300 oC. Electric conductivity of the specimens increases with annealing temperature, and reaches a maximum value of 62.6%IACS after annealing at 450 oC. These results are discussed in comparison with those for the other aluminum alloy.

In order to remove rust and impurities from surface of raw SUS circular bar, peeling machine is used to make lustrous and clean surface of SUS circular bar. Drawing process system is used to manufacture SUS hexagonal bar. SUS hexagonal bar have been widely used to make hexagonal bolt/nut, adapter and fittings and so on. The purpose of this study is to investigate the stabilities for guide bar of clamp in drawing process system. As the results, the guide bar showed structural stability in cases of below load of 50 Ton and over hook radius of 3.0mm. Further as the thickness of guide bar hooking with jaw was increased, minimum safety factor was decreased.

SUS hexagonal bar has been widely used to make many kinds of hexagonal bolt/nuts and fittings. Peeling machine is used to make lustrous and clean surface of SUS circular bar in order to remove rust and impurities from surface of raw SUS circular bar. Similarly, roll unit system is used to make SUS hexagonal bar from SUS circular bar with lustrous and clean surface. Roll unit system is mainly divided into two parts ; one is roll unit and the other is mold frame. The purpose of this study was to evaluate the structural stability of mold frame supporting roll unit with numerical analysis. As the numerical analysis result, higher structural stability was gradually shown in order of models 4, 2, 3 and 1. It was considered that the structural stability of this study was influenced by the decrease of mold frame size, especially height decrease.

SUS hexagonal bar, which is manufactured by drawing process of SUS circular bar, have been widely used to make various adapters and fittings. The purpose of this study is to investigate the characteristics and stability of variable roll unit including stand module. Stand module is essential part of variable roll unit. Structural analysis was performed to predict the stability of stand module using 3 loads (50, 75, 100 Ton), thus it may be of help to the manufacture of stand module. As the results, internal ring of bearing showed maximum equivalent stress, and moreover bearing, shaft and roller had to be preferentially considered in order to maintain its stability. In cases of 50 and 75 Ton, there were no problems for stabilities, respectively, on the other hand, problem for stability may occur in case of 100 Ton.

The side wall thickness variation of the product to the process of ironing and the die pad was studied using a progressive die of the multi-stage drawing product in the process of ironing and the die pad. Experimental results because ironing is possible to increase the side wall thickness of the product is applied to the intermediate drawing process rather than applied in the initial process. The roundness and concentricity were easy control. A die pad is applied to a stand pad to the sixth step from the first step. The seventh step and the eighth step are applied integrated pad. The integrated pad of the seventh step and the eighth step appeared to be advantageous to control the roundness and concentricity.

Using a progressive die of the multi-stage drawing product, It was experiments for the Influence of the Products Roundness on the die pad process Safety die model, obstacle countermeasure research safety die design When the die pad is independent structure, Sidewall thickness of the inside 2stage, 3stage, 4stage of the product is thicker, the thickness of the inside 1stage and the bottom is thinner. it was become unstable beacuse the inside 1stage related to the Products Roundness is thinner. When the die pad is Integrated structure, Sidewall thickness of the inside 1stage, 2stage of the product is thicker, and Sidewall 3stage and 4stage was a thin. it was become unstable beacuse the inside 3stage related to the Products Roundness is thinner. Therefore, The appropriate combination of and integrated independent is required for each process.

다발체형성 제조기술을 이용하여 심하게 인발가공된 Cu-Nb 미세복합재료 전선의 전기적 특성과 열처리에 따른 미세조직 변화와의 관계에 대하여 연구하였다. 다발체형성과 인발공정에 의해 제조된 전선에서 Nb필라멘트 단면방향의 형태는 직선이거나 약간 굽은 형태로 나타났다 Nb필라멘트 형태의 차이는 고온에서의 다발체형성 제조공정중의 Nb필라멘트의 파손과 실린더화에 의해 발생하였다. Cu-Nb 미세복합재료의 비저항은 Cu-Nb 계면에서의 전자 산란에 의해 주로 결정된다. 400˚C의 어닐링온도 이하에서 전도도의 감소는 침상형태 석출물의 정합변형율과 관계된 산란의 기여가 증가하기 때문이다. 비저항의 비 (ρ295K/ρ75K)의 약간의 감소는 또한 Nb원자의 석출 때문이다. 500˚C의 어닐링온도에서 Cu-Nb 미세복합재료의 전도도 중가는 Nb필라멘트의 조대화와 구형화때문이다

AI-1wt%Si합금을 대상으로하여 가열주형을 이용한 수평식연속주조법에 의해 경면에면서 일방향고조직을 가진 주괴를 얻기위한 주조조건을 조사하였으며, 일방향응고된 주괴를 이용하여 신선가공하였을 경우의 다이스배열과 작업조건, 연속주조조건과 신선가공시의 단선율과의 관계를 검토하였다. 그 결과, 직경 8mm 및 4mm 주괴 모두 공정 Si상이 비교적 균일하게 분포되어 있음을 확인할 수 있었고, 이들 주괴를 중간소둔없이 20μm까지의 초극세선가공이 가능했다. 본 연구에서 실시한 극세선의 신선가공중에 발생한 단선은 신선가공중의 작업조건의 불충분에 기인하는 것으로 사료되었다. 따라서, 본 연구에서 얻어진 일방향응고주괴는 극세선제조에 매우 우수한 원소재임을 보여주었다.

1. 미소한 단면적 변화율의 관재인발에서는 직접적인 방법에 의한 평균마찰계수(Mean friction coefficient)와 Sachs의 이론치가 매우 근사한 오차를 나타내므로 축방향 응력으로부터 마찰계수를 결정할 수 있다. 2. 비교적 높은 단면적 감소율의 인발에 있어서는 직접적인 방법에 의한 평균마찰계수가 Sachs등의 값 보다 더욱 실험치에 더욱 접근하므로 반경방향분력의 측정이 필요하다. 3. 봉재인발가공에 사용되는 평균마찰계수의 추정치도 관재인발의 경우에 확대 적용이 가능하다.