When selecting the tonnage of friction press required for precision forging straight, first calculate the precision forging forming force of bevel gear, and then determine the equipment tonnage according to the deformation characteristics. The formula is as follows:
F ‘- nominal pressure;
Q – deformation coefficient, 1.6 for fine pressed parts with small deformation, 1.3 for straight bevel gear forgings with slightly large deformation, and 0.9-1.1 for straight bevel gear forgings with large deformation.
According to the forming force of precision forged straight bevel gear and the tonnage calculation formula of friction press in the table, 4000kn friction press precision forged planetary gear and 10000kN friction press precision forged halfshaft gear are selected.
|Workpiece||Forming force||Formula 1||Formula 2||Formula 3||Formula 4||Formula 5||Formula 6|
|Planet gear||Pre forging||4575||5563||4421||3179||3000||4046|
|Halfshaft gear||Pre forging||13691||13681||11195||8049||10000||10244|