Casting and forging combined forming process for non-quenched and tempered steel connecting rod blank

Abstract

The invention belongs to the field of engine connecting rods, and particularly relates to a casting and forging combined forming process for a non-quenched and tempered steel connecting rod forging blank of an automobile engine. The casting and forging combined forming process comprises the following steps of (a) smelting non-quenched and tempered steel; (b) pouring and forming the connecting rod casting blank: injecting molten metal of the smelted non-quenched and tempered steel into a casting die through a pouring system, filling and solidifying so as to cast the casting blank; (c) cooling and shaking out the casting blank: shaking out after the casting blank is air-cooled to room temperature; (d) cleaning the surface: cleaning a casting head, burrs and sand on the surface of the casting blank; (e) heating the casting blank; (f) performing die forging and forming: putting the heated casting blank in the forging die so as to be ultimately formed; (g) trimming the casting blank; and (h) regulating and cooling the casting blank. By adopting the casting and forging combined forming process, the connecting rod which is close to an end product can be obtained once, energy consumption can be effectively reduced, and the production efficiency can be improved; according to the casting and forging combined forming process, the non-quenched and tempered steel is adopted, so that subsequent quenching and tempering treatment is omitted, and therefore, the casting and forging combined forming process has the advantages of energy conservation and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of engine connecting rods, and in particular relates to a casting and forging composite forming process suitable for forging blanks of non-quenched and tempered steel connecting rods of automobile engines. Background technique [0002] The connecting rod is a key part of the engine, which works under high-frequency loads and has high requirements for strength. Its processing technology level directly affects the manufacturing level and product quality of the complete engine. The forming process of engine connecting rod mainly includes squeeze casting, cross wedge rolling, roll forging, die forging, powder metallurgy forging, etc. At present, the connecting rod forming mainly adopts the production process of cross wedge rolling or roll forging billet + die forging precision forming. Cross wedge rolling and roll forging have high requirements on the service life of the mold and the tonnage of the equipment, and the co...

AI Technical Summary

Problems solved by technology

Cross wedge rolling and roll forging have high requirements on the service life of the mold and the tonnage of the equipment, and the connecting rods produced by casting have casting defects such as shrinkage and shrinkage

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