Production method for casting cylinder liner blank for ammonia refrigerator by adopting precoated sand molding

Abstract

The invention relates to a production method for casting cylinder liner blank for an ammonia refrigerator by adopting precoated sand molding. The method is characterized in that the size of the cylinder liner blank retained with processing amount is determined according to the design requirement, and a semi-open type precoated sand die is manufactured according to the size of the cylinder liner blank; and a cylinder liner metal tyre mold is installed on a centrifugal casting machine, the semi-open type precoated sand die for the cylinder liner blank is loaded in the cylinder liner metal tyre mold for casting, and the iron liquor smelted through a cupola and containing different percentages of various metallic elements is cast in the cylinder liner metal tyre mold of the centrifugal casting machine. The invention is a production method for casting the cylinder liner blank for the ammonia refrigerator by adopting precoated sand molding, because the weight of the cylinder liner blank, the mechanical processing amount and the cost of the products are all reduced, the production efficiency is improved; because the precoated sand is separated on the surface of the cylinder liner blank for water cooling, the chilling is caused by the water cooling, the surface hardness of the cylinder liner blank is less influenced; and the mechanical processing is convenient and the working environment of the workers is improved.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a cylinder liner blank produced by centrifugal casting, in particular to a production method for forming and casting an ammonia refrigerator cylinder liner blank by using a film-coated sand sleeve. Background technique [0002] At present, domestic and foreign centrifugal casting produces cylinder liner blanks. Traditionally, metal molds are used for centrifugal casting, and multi-step taper filming methods and wet coatings are used. There are cylinder liner blanks cast by this method: 1. The weight of the cylinder liner blank is large, which is three times the weight of the processed cylinder liner, resulting in high production cost of the cylinder liner; 2. The surface of the cylinder liner blank is chilled due to water cooling, and the The surface hardness of the cylinder liner blank is high, which brings difficulties to machining; 3. Since the metal film is used to cast the cyl...

AI Technical Summary

Problems solved by technology

There are cylinder liner blanks cast by this method: 1. The weight of the cylinder liner blank is large, which is three times the weight of the processed cylinder liner, resulting in high production cost of the cylinder liner; 2. The surface of the cylinder liner blank is chilled due to water cooling, and the The surface hardness of the cylinder liner blank is high, which brings difficulties to machining; 3. Since the metal film is used to cast the cylinder liner blank, the main components of the refractory wet coating in the metal film cavity are quartz powder, lead powder, bentonite and washing powder. Quartz powder and lead powder have large dust and are harmful substances, which directly affect the health of operators