Processing method of large sprocket of automobile engine

Abstract

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.

Description

technical field [0001] The invention relates to a processing method for a large sprocket of an automobile engine. Background technique [0002] The traditional processing method of large sprockets of automobile engines is to use powder metallurgy (the process of mixing metal or non-metal powders, pressing them into shapes, and sintering them at a temperature lower than the melting point of the metals, and using atomic diffusion between the powders to make them bond), Products processed by this method, although the injection molding technology has almost no restrictions on the complex shape of the formed parts, but due to the large amount of binder added, the workpiece will be deformed due to the influence of gravity during the heating process, so It is often necessary to add a more complex and expensive special degreasing process, making injection molding technology more expensive than conventional powder metallurgy technology, Contents of the invention [0003] The techn...

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Problems solved by technology

[0002] The traditional processing method of the large sprocket of the automobile engine is to use powder metallurgy (the process of mixing metal or non-metal powders, pressing them into shapes, and sintering at a temperature lower than the melting point of the metals, and using atomic diffusion between the powders to bond them), Products processed by this method, although the injection molding technology has almost no restrictions on the complex shape of the formed parts, due to the large amount of binder added, the workpiece will be deformed due to the influence of gravity during the heating process, so It is often necessary to add a more complex and expensive special degreasing process, making injection molding technology more expensive than conventional powder metallurgy technology,

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