Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method

Abstract

The invention discloses a lost wax shell-based negative pressure dry sand and iron shot chilling vibrational composite casting process method. The method is characterized by comprising the following steps of: feeding a shell manufactured by a lost wax process into a chilling sand box; loading steel shots in the gap between the shell and the chilling sand box; feeding the chilling sand box into a sand box with a vacuumized negative pressure model; fully filling dry sand between the chilling sand box and the sand box with the vacuumized negative pressure model; paving a plastic film; placing a pouring cup; and pouring under the simultaneous vacuumizing and vibrating condition. By the method, the strength of molding sand is high, a chilling effect is good, the process characteristics of lost foam casting and hot investment casting are combined, the defect of foam-gasified carbon special for the lost foam casting is overcome, the chilling effect of the iron shots is fully exerted, the pouring is performed under the vibration condition, and alloy grains are refined, so that wear-resisting castings have higher density, hardness and wear resistance.

Description

technical field [0001] The invention belongs to the field of casting process methods for wear-resistant products, in particular to a vibration composite casting process method based on negative pressure dry sand and iron shot chilling of lost wax shells. Background technique [0002] Lost foam casting is to bury the white mold made of EPS or STMMA copolymer in the molding sand, and then pour the molten metal from the sprue cup after vacuuming and compacting. The shape of the lost foam meets the vaporization of the molten metal to form a cavity, and the molten metal fills the cavity and solidifies to form a casting. [0003] The lost foam casting process adopts vacuum negative pressure technology, which is easy to shape and has good mold rigidity. However, the lost foam casting process also has its inherent weaknesses, that is, the castings are prone to defects such as carburization, slow cooling speed, and incompact structure. [0004] Investment casting, also known as "los...

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Problems solved by technology

[0007] The purpose of the present invention is to avoid the shortcomings of lost foam casting and investment casting, to provide a method that can not only avoid the carburization defect of lost foam casting process, but also solve the problems of coarse crystal grains and poor structure caused by slow cooling speed. Vibration composite casting process based on negative pressure dry sand and iron shot chilling based on lost wax shell for compactness and other problems

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