Abstract:
PURPOSE: A steel material composite, hallow drive shaft, and a manufacturing method thereof are provided to reduce noise without a separate damper by preventing the resonance frequency with another car body in rotation. CONSTITUTION: A steel material composite comprises carbon(C) 0.25~0.35 wt%, silicon(Si) 0.2~0.5 wt%, manganese(Mn) 1.0~2.0 wt%, vanadium(V) 0.05~0.20 wt%, aluminum(Al) 0.01~0.05wt%, titanium(Ti) 0.005~0.20 wt%, boron(B) 0.001~0.006 wt% and Fe remainder.
Abstract:
PURPOSE: A ball-stud for a vehicle and a manufacturing method thereof are provided to remarkably reduce the generation of carbon dioxide by manufacturing the ball-stud using high frequency process. CONSTITUTION: A manufacturing method of a ball-stud for a vehicle comprises the following steps: heating a raw material(100) to 900~1,100 deg C while passing though the raw material among a high frequency coil(200), and rapidly cooling; heating the rapidly cooled raw material to 650~750 deg C while passing though the raw material among the high frequency coil, and slowly cooling; cold forging the raw material; spreading the raw material into a wire form and passing though the raw material among the high frequency coil in a straight line; and forging the raw material at the room temperature after cutting the material in a constant size.
Abstract:
본 발명은 절삭성이 우수한 고강도 고인성 주철재 및 이를 이용한 샤시부품의 제조 방법에 관한 것으로서, 더욱 상세하게는 구상흑연주철에 보론(Boron)을 첨가하여 구상흑연의 크기를 작고 균일하게 만들고 취성을 가진 유리탄화물을 적정량 생성시키도록 구성한 주철 조성물과, 이를 이용하여 오스템퍼링 열처리를 공정을 개선함으로써 우수한 강도와 인성을 확보할 수 있으면서 절삭성이 우수한 고강도 고인성 주철재 및 이를 이용한 샤시부품의 제조 방법에 관한 것이다. 이를 위해, 본 발명은 철(Fe)을 주성분으로 하고, 여기에 탄소(C) 3.0~4.0 중량%, 규소(Si) 2.5~3.1 중량%, 망간(Mn) 0.1~0.5 중량%, 인(P) 0.05 중량% 이하, 황(S) 0.05 중량% 이하, 마그네슘(Mg) 0.015 중량% 이상, 구리(Cu) 0.1~0.8 중량%, 몰리브덴(Mo) 0.1~0.3 중량%, 니켈(Ni) 0.1~1.0 중량%, 보론(B) 0.02~0.06 중량%가 함유된 것을 특징으로 하는 절삭성이 우수한 고강도 고인성 주철재 및 이를 이용한 샤시부품 제조 방법을 제공한다. 주철재, 고인성, 고강도, 절삭성, 보론, 샤시제품
Abstract:
C 0.23~0.33wt%, Si 0.15~0.35wt%, Mn 0.9~1.3wt%, P 0.03wt%이하, S 0.02wt%이하, Cr 0.5~0.7wt%, Ti 0.005~0.02wt%, V 0.05~0.1wt%, B 0.001~0.004wt% 및잔부 Fe로구성된도어힌지브라켓및 그제조방법이소개된다.
Abstract:
The present invention relates to a method for manufacturing a hollow axle shaft using partial swaging and more specifically, to a method for manufacturing a hollow axle shaft comprising: a first step for heating an end of one side of a circlematerial of a tube form; a second step for compressing the end of one side which is heated having a first hammer for holding an outside and a first supporting stand for supporting a side by applying a load to a compressing part installed in an end of the other side; and a third step for inserting a mandrel into the compressed end, and for partially swaging the compressed end by rotating the circlematerial of a tube form after replacing the first hammer with a second hammer. In a conventional method, a whole section of a circlematerial of a tube form is swaged. However, a method for manufacturing a hollow axle shaft using partial swaging is capable of reducing processing costs by swaging an end of the circlematerial of a tube form corresponding to a small diameter of a hollow axle shaft, and improving matter properties such as strength, and corrosion resistance, etc. by controlling a component of the circlematerial of a tube form. [Reference numerals] (S100) Heating; (S110) Compressing; (S120) Partially swaging; (S130) Spline processing; (S140) High frequency heat treating
Abstract:
PURPOSE: A steering rack bar for a vehicle and a manufacturing method thereof are provided to secure cold formability and heat-treatment hardness of a steering rack bar by employing carbon steel with a carbon content of 0.3~0.4 weight%. CONSTITUTION: A method for manufacturing a steering rack bar for a vehicle comprises steps of: preparing a steel pipe(10), extruding the steel pipe to form a tooth part on the outer surface of the steel pipe, forming rack teeth(12) in the tooth part, and processing the toothed and rear surfaces of the rack teeth with high frequency.
Abstract:
C 0.23~0.33wt%, Si 0.15~0.35wt%, Mn 0.9~1.3wt%, P 0.03wt%이하, S 0.02wt%이하, Cr 0.5~0.7wt%, Ti 0.005~0.02wt%, V 0.05~0.1wt%, B 0.001~0.004wt% 및잔부 Fe로구성된도어힌지브라켓제조방법이소개된다.
Abstract:
PURPOSE: High-strength spheroidal graphite cast iron and a manufacturing method thereof are provided to prevent an increase in the weight of parts and to secure a suitable elongation ratio as well as increased strength. CONSTITUTION: A method for manufacturing high-strength spheroidal graphite cast iron comprises the steps of: melting a material to obtain a melt(S100), injecting the melt into a mold at 1300-1500°C(S200), solidifying the casting and regulating cooling speed to maintain 70-90% of pearlite(S300), and separating the casting from the mold and air-cooling the casting(S400). [Reference numerals] (S100) Melting; (S200) Injecting; (S300) Solidifying; (S400) Air-cooling