Cavity-pasting full-mold casting method

Abstract

A disclosed cavity-pasting full-mold casting method comprises: (1) preparing a frame mold and enabling the core-space contour structure of the frame mold to be corresponding to the exterior contour structure of a casting; (2) employing a ground pit for molding, firstly filling pit-bed sand on the bottom of the ground pit, then paving a layer of clay sodium silicate sand, leveling, and hardening with carbon dioxide, putting the frame mold, taking the inner-side edges of the frame mold as a basis, pre-embedding a pouring pipe, filling the outer periphery of the frame mold with sand and strickling the inner side at the same time; (3) employing carbon dioxide to harden the sand mold, and then taking out the frame mold; (4) preparing a foam mold plate according to the wall thickness of the casting, taking a mold hole as a basis, pasting the foam mold plate on the mold holes, and during molding of the foam mold plate, embedding a resistance wire into a segment, from an ingate to an open riser, in the foam mold plate; (5) putting the open riser, and filling the core space of the casting with sand; (6) employing carbon dioxide to blow and harden the core-space mold sand, then accessing the resistance wire with a power supply, and fusing the foam mold plate under electric heating; and (7) pouring, solidifying, cooling and cleaning.

Description

technical field [0001] The invention belongs to the technical field of full-mold casting, and in particular relates to a cavity-attached full-mold casting method. The casting method first makes the mold cavity, and then pastes the cavity to make a real shape based on the hole surface of the mold cavity. The cavities-attached full mold casting method is especially suitable for producing single-piece and small-batch large shell castings. Background technique [0002] With the development of mining, metallurgy, energy, power generation and other industries, the proportion of large castings is increasing. The production of large-scale castings has a characteristic. Generally, the batch is small, but the size is large. According to the conventional wooden mold molding process, the required pattern production is large, the construction period is long, and the cost is high. However, because the casting batch is not large, the pattern, sand box The cost of other tooling is allocat...

AI Technical Summary

Problems solved by technology

The production of large-scale castings has a characteristic. Generally, the batch is small, but the size is large. According to the conventional wooden mold molding process, the required pattern production is large, the construction period is long, and the cost is high. However, because the casting batch is not large, the pattern, sand box The cost of other tooling is allocated to the production cost of castings, resulting in higher production costs of castings

In addition, using the conventional full mold casting technology, the steps of making the foam mold first and then filling the sand for molding, because the rigidity of the foam mold is low, it is easy to cause deformation of the shape when filling the sand, which affects the quality of the casting

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