Casting and forging combined technique of aluminum alloy linkage rod

Abstract

The invention discloses technology for casting and forging an aluminum alloy connecting rod, wherein an aluminum alloy composition of the connecting rod is adjusted by addition of rare earth element in casting technology, and the addition of the rare earth element is 2 to 5 percent of an aluminum liquid; the aluminum alloy connecting rod is guaranteed to comprise the following compositions: 88 to94 percent of aluminum, 3.8 to 4.9 percent of copper, 0.5 to 1.5 percent of silicon, 0.4 to 1.2 percent of manganese, 0.4 to 1.0 percent of magnesium, 0.8 to 1.8 percent of rhenium and 0.4 to 0.14 percent of iron; and a casting head is not cut off and reheated in the casting technology and taken as one part or a scrapped part of a forged piece, and casting afterheat is utilized for forging. The technology simplifies the prior die forging technology, improves reasonable floatation, the streamline and mechanical properties of casting metals, improves a metallurgical structure close to the casting head on the forged piece, and has the effects of high technological utilization rate of materials, shortened technological process and energy conservation and consumption reduction. Moreover, the casting and forging technology can obviously improve the internal quality and the mechanical properties of casting blanks, and the production cost of the casting blanks is lower than that of the prior die forging.

Description

technical field [0001] The invention relates to the field of manufacturing technology, in particular to a combined casting and forging process method for aluminum alloy connecting rods, which is suitable for manufacturing aluminum alloy connecting rods in the industries of gasoline engines, diesel engines and compressors. Background technique [0002] In the production of auto parts in foreign countries, including crankshafts, cross shafts, transmission gears and differential discs, forgings are produced by casting blanks instead of rolled materials. The research and application of domestic casting blanks in die forging production started relatively late, and is currently in the primary stage of basic research and application development research. In the production of aluminum alloy connecting rods, most enterprises use traditional forged aluminum or hard aluminum alloy. Surface treatment, machining and other processes, the connecting rod or other parts produced by this met...

AI Technical Summary

Problems solved by technology

At present, the application of this process to produce aluminum alloy connecting rods mainly has the following problems: the loose structure of the billet, the incomplete degassing and slag removal, the serious shrinkage cavity and shrinkage, which are difficult to improve after forging; the flow of metal during forging is unreasonable, and the forging The streamline does not match, and the mechanical properties are difficult to meet the requirements; the shrinkage cavity and porosity that appear at the joint between the billet and the pouring riser are difficult to change after forging; the energy consumption is relatively large

The defect of the die-casting and forging dual-control forming method is that since the die-casting and forging use the same pair of molds, the forging reduction cannot be too large, and a certain forging ratio cannot be reached, the metal cannot flow reasonably, the streamline is unreasonable, and the mechanical properties are not good. Ideal etc.