Manufacturing method for engine assembly type camshaft

The invention discloses a manufacturing method for an engine assembly type camshaft, and belongs to the field of manufacturing technologies of engine parts and components. Cam pieces of the camshaft are green bodies formed by pressing through powder metallurgy, gears, shaft necks and other assembly parts are powder metallurgy pressed green bodies or machined semi-finished products, a base body shaft is a hollow seamless steel tube and is connected with the assembly parts, then positions and angles of all components are guaranteed through key grooves or positioning clamps, by the utilization of the sintering shrinkage characteristic of powder metallurgy material, the powder metallurgy green bodies and the base body shaft are sintered and welded together at high temperature, and the mode that copper foil and other brazing filler metal are added is used for brazing the machined assembly parts and the base body shaft together, so that the assembly technology is completed. According to the manufacturing method for the camshaft, the powder metallurgy sintering welding technology and the common brazing technology are combined; compared with a traditional manufacturing technology for the camshaft, more materials of all components of the camshaft can be selected, the torque between the assembly parts and the base body shaft is large, the number of manufacturing steps is small, the period is short, and the manufacturing method has the advantage of obviously saving energy.