Abstract:
본 발명은 도장 접착성이 우수한 저비중 자동차 내장트림용 폴리프로필렌 수지 조성물에 관한 것으로, 더욱 상세하게는 폴리프로필렌, 프로플렌-에틸렌 공중합체 또는 이들의 혼합물로 이루어진 베이스 수지에 수산화마그네슘을 포함하는 강화재 및 에틸렌-부텐 엘라스토머를 혼합함으로써 페인트 도료와의 접착성이 향상되어 프라이머 처리 없이도 도장이 가능하며, 자동차 내장트림의 내충격성이 향상되어 파손에 대한 저항성이 탁월한 도장 접착성이 우수한 저비중 자동차 내장트림용 폴리프로필렌 수지 조성물에 관한 것이다.
Abstract:
The present invention relates to a low-density polypropylene resin composition for a vehicle interior trim with improved paint adhesion, and more specifically, to a low-density polypropylene resin composition for a vehicle interior trim with improved paint adhesion in which a reinforcement material comprising magnesium hydroxide and an ethylene-butene elastomer are mixed in a base resin composed of polypropylene, a propylene-ethylene copolymer, or a mixture thereof so that adhesion with paints is improved thereby enabling painting without primer treatment and impact resistance of a vehicle interior trim is improved thereby having excellent resistance to damage.
Abstract:
The present invention relates to a method of manufacturing a hot forged product comprising: a first step for forming a powder forming sintered body since a press pressurizes a mold after a powder is charged in the mold; a second step for sintering the formed powder forming sintered body in a sintering furnace; a third step for shot blast processing the sintered powder forming sintered body; a forth step for carbon-coating the shot blast processed powder forming sintered body; a fifth step for high-frequency induction heating the carbon coated powder forming sintered body; a sixth step for forging the high-frequency induction heating powder forming sintered body; a seventh step for cooling the forged powder forming sintered body in a nitrogen atmosphere; and an eighth step for shot blast processing the cooled powder forming sintered body. The method of manufacturing a hot forged product is capable of reducing a production cost since a loss of a material and a processing amount are reduced than a conventional hot forging process, and reducing a manufacturing process by using a powder forming sintered body as a preform of a hot forging. [Reference numerals] (S100) Forming; (S200) Sintering; (S300,S800) Shot blast; (S400) Carbon coating; (S500) High-frequency induction heating; (S600) Forging; (S700) Cooling
Abstract:
PURPOSE: A multi-stage control cooling process for manufacture of V-MA pearlite-ferrite hot-forged steel is provided to increase the ferrite fraction by super-cooling a hot-formed structure to low temperatures and maintaining a constant temperature at the transformation temperature of ferrite. CONSTITUTION: A multi-stage control cooling process for manufacture of V-MA pearlite-ferrite hot-forged steel comprises the steps of: rapidly cooling a hot-forged body to a low transformation temperature range of austenite-ferrite, maintaining a constant temperature in the transformation temperature range of austenite-ferrite, and air-cooling the hot-forged body.