Ultra-large type evanescent mould precision-casting shell manufacturing tool and shell manufacturing process thereof

Abstract

The invention relates to an ultra-large type evanescent mould precision-casting shell manufacturing tool and a shell manufacturing process thereof, belonging to the technical field of investment casting. The ultra-large type evanescent mould precision-casting shell manufacturing tool comprises a first wheel spoke structure and a second wheel spoke structure which are arranged on a main shaft, one end of the main shaft is connected with a power mechanism, the main shaft is provided with bearings between the power mechanism and the first wheel spoke structure and on the right end part of the second wheel spoke structure, the two bearings are arranged on two bearing seats, and the two bearing seats are fixed on a chassis. The shell manufacturing process comprises the following steps of: when a shell is manufactured, installing an evanescent mould on the main shaft, adhering the small ends of a plurality of connected lug bosses on a pouring channel and a feed head of the evanescent mould and an evanescent mould body, and adhering the large ends to the inner sides of the first wheel spoke structure and the second wheel spoke structure; rotating the main shaft, spraying paint on the surface of the evanescent mould by adopting flow coating mode, and then scattering sand; after the evanescent mould is dried, spraying the paint and scattering the sand again till the number of mould shell layers is reached, and then cutting off the connected lug bosses; taking down the evanescent mould and the shell from the ultra-large type evanescent mould precision-casting shell manufacturing tool, and then roasting to obtain the mould shell. The mould shell has the advantages of difficult deformation, smooth paint immersion process, stable quality of a produced product, labor conservation and work efficiency increase.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a super-large lost foam precision casting shell-making tooling and a shell-making process. Background technique [0002] For a long time, an important factor hindering the production of large castings by lost foam precision casting is the inability to obtain a qualified and stable mold shell. For this reason, many experts have designed various manipulators, but processing with manipulators is not only expensive, difficult to operate, but also poor in applicability, and the quality of the mold shell cannot be guaranteed at all. [0003] At present, the company adopts the lost foam process to produce the first-stage impeller and guide vane, and the weight of the casting blank is 920kg and 2200kg respectively. The traditional shell-making process is to put the lost foam of the impeller or guide vane in the paint tank, manually rotate the lost foam to soak the surface of ...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned shell making process has the following problems: 1. Since the blades of the impeller and guide vane are relatively thin, the mold shell will easily be deformed due to uneven force during the shell making process; 2. The outline size and volume of the casting are large, such as Using the traditional paint dipping process, the buoyancy of the paint during the paint dipping process (the density of the paint is 2.8kg / L, the density of the lost foam is about 0.04kg / L) is 1400kg, and it is impossible to operate at all; 3. After dipping the paint, it needs Immediately hang the sand. In order to ensure that all parts of the lost foam are hung with sand, the sand must be hung while turning the module. Such a huge casting cannot be turned flexibly, and it is impossible to ensure that the slurry and sand on the module will not fall off after turning over.

Images