MANUFACTURING METHOD OF ALUMINUM BEARING INSERT FOR LOWER CRANK CASE OF ENGINE

摘要

PURPOSE: A method for manufacturing an aluminum bearing insert for a lower crank case of an engine is provided to easily mold a bearing insert by hot-forging preform within a predetermined temperature range after preheating the preform and a forging mold. CONSTITUTION: A method for manufacturing an aluminum bearing insert for a lower crank case of an engine includes: a step(S10,S20) of manufacturing preform corresponding to the shape and size of a bearing insert by molding molten metal manufactured from a melted aluminum alloy composite; a step(S30,S40) of manufacturing the bearing insert by hot-forging the preform heated at a predetermined temperature; and a step(S50,S60) of trimming a flash outwardly protruding from the bearing insert when the preform is hot-forged, and then finishing with grinding the bearing insert using a short blaster. [Reference numerals] (AA) Start; (BB) End; (S10) Molten metal preparation; (S21) Mold preheating; (S22) Ingot molding; (S23) Scrap removal; (S24) Preform manufacture; (S30) Preform heating; (S40) Hot forging; (S50) Trimming; (S60) Shot blast