Process for improving full mold casting engine cylinder yield

Abstract

The invention discloses a process for improving a full mold casting engine cylinder yield. The process comprises such steps as mode production, combination, coating, molding, shaping, casting, taking and detection. The process for improving the full mold casting engine cylinder yield adopts a foam model produced by expandable methyl methacrylate and styrene copolymerized resin beads to improve the casting yield, uses a sealing film and a vacuum pump for vacuum air extraction of a sand box to form negative pressure, increases viscosity between dry sand, guarantees uniform feeding of casting liquid, facilitates gas elimination, and improves the casting integrity; after the mold casting is finished, a vacuum air extraction device continuously extracts air to maintain 200-300 s vacuum, so that the casting stability and the casting molding yield are guaranteed to realize the advantages of reasonable matching, simple operation process and high reliability; and the process is higher in innovativeness, practicability and utilization value.

Description

Technical field [0001] The invention relates to the technical field of casting, in particular to a process for improving the yield of lost foam casting engine cylinders. Background technique [0002] Lost foam casting is a solid casting of foam plastic molds using dry sand without binder and vacuum technology. It combines foam models similar in size and shape to the castings to form clusters, brushed with refractory paint and dried, and then buried in Vibration modeling in dry quartz sand, pouring under negative pressure to vaporize the model, liquid metal occupying the position of the model, solidification and cooling to form a new casting method, compared with traditional casting technology, lost foam casting has the following characteristics, casting quality Good, low cost, unlimited material, suitable for size, size, high precision, smooth surface, reduced cleaning, saving machine, greatly reduced internal defects, compact organization, large-scale and mass production, automa...

AI Technical Summary

Problems solved by technology

[0002] Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in dry quartz sand, pouring under negative pressure, vaporizes the model, liquid metal occupies the position of the model, and solidifies and cools to form a new casting method. Compared with traditional casting technology, lost foam casting has the following characteristics, casting quality Good quality, low cost, unlimited material, suitable size, size, high precision, smooth surface, less cleaning, less machining, greatly reduced internal defects, dense organization, large-scale and mass production, automated assembly line, environmental protection, It can greatly improve the working environment, reduce labor intensity, and reduce energy consumption. However, since the lost foam is buried in dry quartz sand, the quartz sand is not easy to fix through vibration, and it is easy to cause the model wall to collapse or not be fixed during the pouring process. The generated gas is not easy to get rid of, so that when the casting is formed, its surface is not smooth, resulting in product defects and scrapping, which affects the yield of the engine block. Yield process