The invention relates to a method for
machining automobile engine large chain wheels. The method is characterized by including the following steps that uncoiling, straightening, and fine blanking are performed to form parts, wherein multiple taper holes are formed in the circumferential direction of each part, a shaft hole is formed in the center of each part, and the shape of each part is in a tooth shape; whether hard scratches exist on the surfaces of the parts or not is checked, then the products without the scratches are selected for cleaning, and it is guaranteed that residual water drops,
corrosion and fine blanking oil do not exist; the parts are installed in a double-end-face
grinding machine for surface coarse
grinding; chamfering
machining is performed on the two faces of tooth parts of the parts; burrs generated by the chamfering
machining are removed; high-frequency
quenching heat treatment is performed; shot blasting machining is performed; single-face accurate
grinding is performed on the surfaces of the parts; the parts are placed into the double-end-face grinding
machine again for surface accurate grinding;
countersink milling machining is performed on the shaft holes formed in the centers of the parts; burr removal is performed; demagnetization is performed; cleaning, packaging and warehousing are performed. The method not only can meet the requirements for size precision and position precision of the products, but also enables the machining technology of the parts to be in the simplest and optimal state, and machining cost is reduced.