Precision casting technology for small type fermentation tank

Abstract

The invention discloses a precision casting technology for a small type fermentation tank, which comprises the following steps: processing a fermentation tank model for setting, then arranging a pouring gate and a dead head in the model; manufacturing an external model sand box, a positioning loam core and a pouring gate loam core according to casting specifications; manufacturing water-glass sand through mixing, and then placing the water-glass sand in a die for modelling; performing die matching on the water-glass sand, performing roasting and mould assembling by using a hot blast stove, and performing box pressing on the water-glass sand die after the completion of roasting; pouring molten iron in the cavity of the water-glass sand die for pouring, taking out a fermentation tank casting after cooling, performing sand cleaning processing, and then polishing the inner surface and outer surface of the fermentation tank casting; feeding the fermentation tank casting in thermal spraying equipment, uniformly spraying titanium alloy on the inner wall of the fermentation tank casting through a spray gun, and sequentially performing quenching treatment and drying treatment. The precision casting technology has the advantages that the technology is simple, and the cast finished fermentation tank is good in quality, abrasive resistance and corrosion resistance.

Description

technical field [0001] The invention relates to a casting process, in particular to a precision casting process for a small fermenter. Background technique [0002] Casting process is one of the basic processes of modern machinery manufacturing industry. Metal component casting is to smelt metal into liquid metal that meets certain requirements, and pour it into the casting cavity to obtain predetermined shape, size and performance after cooling, solidification and cleaning. casting process. Commonly used casting techniques in the prior art include resin sand casting, lost wax precision casting, plaster casting and the like. The disadvantage of resin sand casting is that it is rough, the shape is not vivid, and complex shapes cannot be made; the shape of lost wax precision casting is delicate, and complex shapes can be completed, but its process is complex, costly, and takes a long time, and it can only make small products. It cannot be made into a large piece, and it is e...

AI Technical Summary

Problems solved by technology

The disadvantage of resin sand casting is that it is rough, the shape is not vivid, and complex shapes cannot be made; the shape of lost wax precision casting is delicate, and complex shapes can be completed, but its process is complex, costly, and takes a long time, and it can only make small products. It cannot be made into a large piece, and it is easy to deform; gypsum casting is used more in the casting of craft products, the advantage can be made larger, and it is not easy to deform. The disadvantage is high cost and long cycle

[0003] In the prior art, when casting small fermentation tanks, the obtained steel castings are prone to defects such as cracks, blisters, and pores, which affect product quality, cause great difficulties for subsequent processing, and increase production costs. And wear resistance is not good, during the fermentation and cleaning process, the inner wall of the fermenter is easily corroded