Vacuum sealed molding casting method production process for front bridge and rear bridge of automobile

Abstract

The invention relates to a vacuum sealed molding casting method production process for a front bridge and a rear bridge of an automobile. The front bridge and the rear bridge of the automobile are characterized by being produced by the following steps that: (1) a model is provided with a longitudinal air hole by which the model is divided into an upper half body and a lower half body; (2) the upper half body of the model is flatly placed on an air exhaust box, a film is roasted to be soft and then covered on the surface layer of the model, and after air exhaust, the film is closely adhered to the model and a top plate; (3) the film, covered on the circumference of the gating and risering model, is jointed with an in gate in the half body of the model, the film on the model is sprayed with a coating, and then a sand box is covered, the sand box is filled with dry sand, a vibrating table is started to tamp the dry sand, the surface of the sand layer is scraped to be smooth, and an upper opening is covered by a sealing cover; (4) the dry sand is agglomerated and hardened by vacuum pumping, the air exhaust box stops air exhaust, but the sand box is continuously vacuumized, the sand box is lifted up, the upper half body models is taken out, the gating and risering model is drawn out, and the upper sand box is formed; (5) the lower half body of the model repeats the steps to form the lower sand box; and (6) the bottom surfaces, where the mould cavities of the half body models are formed, of the upper sand box and the lower sand box are closed, and the molten metal is poured in from the gating and risering, and after cooling, the blanks of the front bridge and the rear bridge of the automobile are produced. The products produced by the process are high in accuracy and low in cost.

Description

technical field [0001] The invention relates to a vacuum-sealed mold-casting production process for front and rear axles of automobiles and a sand box device thereof. Background technique [0002] The H-shaped front axle of the automobile is an important safety part carried by the automobile. At present, the front axle products of various domestic manufacturers mainly adopt the forging process to forge 45# or 50# or 30Cr (45# basically) steel into the front axle blank, which is processed by heat treatment and gold processing. Its equipment investment is large, the mold investment cost is high, and the speed of developing new varieties is slow and the investment is relatively large. There are also some front axle manufacturers who use investment casting to precision cast front axle blanks. The casting process is complicated, long, labor-intensive, difficult for workers to master, high casting cost, especially not environmentally friendly, and the pollution is very serious. ...

AI Technical Summary

Problems solved by technology

The cost of this method is high, welding is a manual operation by individuals, the difference is relatively large, and the quality is unstable

Another method is to use ordinary sand casting. Due to the defects of ordinary sand casting, such as surface pores, subcutaneous pores, internal pores, sand inclusions, slag inclusions, rough appearance, etc., have not been well resolved. Therefore, the yield rate is not very high, and the quality is not easy to control

Images