Preparation method of precision casting mold shell for large complex thin-walled casing

Abstract

The invention discloses a refined casting mold shell preparation method for large complicated thin-wall cases. The method comprises the following specific steps: whole casting wax patterns are dividedinto multiple equal parts; then, wax pattern molds are manufactured according to the disassembly design of the wax patterns for pressing the wax patterns; wax plate molds are designed for pressing wax plates; the wax patterns are assembled with the wax plates; the assembled wax molds are used for pulp staining and sand drenching shell production; then, disassembled part mold shells are manufactured by dewaxing and roasting; triangular projections of 5-8 mm are cut; all the equal cut disassembled mold shells are combined; and the combined mold shells and a special casting system are preheatedto finish casting. The refined casting mold shell preparation method for the large complicated thin-wall cases cuts the whole wax patterns at the previous stage, then, uses the disassembled wax pattern molds for single shell production, and finally, uses a mold shell assembly mode to realize mold shell production of the large complicated thin-wall cases.

Description

technical field [0001] The invention belongs to the technical field of precision casting methods, and relates to a method for preparing a precision casting mold shell of a large complex thin-wall casing. Background technique [0002] Gas turbine casing, as the key flow-through part of the gas turbine and the supporting part of the whole machine and the blades, is one of the parts with the worst working environment and the most complex structure of the gas turbine, and it is also one of the frequent failure parts of the gas turbine. This type of casing has thin wall thickness, complex structure, and high surface finish requirements, and is generally produced by precision casting. However, due to the large diameter of this type of casing, generally above Φ1000mm, most domestic precision casting manufacturers do not have equipment for producing such large-sized casting mold shells, and because the size is too large, it is necessary to With the assistance of manipulators, it ca...

AI Technical Summary

Problems solved by technology

However, due to the large diameter of this type of casing, generally above Φ1000mm, most domestic precision casting manufacturers do not have equipment for producing such large-sized casting mold shells, and because of the large size, it is necessary to produce mold shells with slurry and sand. Assisted by manipulators, it cannot be realized manually; a small number of precision casting companies can produce such castings. When producing such casing castings, the usual method is to first disassemble the wax pattern in the wax pattern making stage, and then assemble it Form the overall wax pattern, and then carry out dipping and sanding to make the shell. However, the overall wax pattern produced by this wax pattern assembly method has a large size and poor dimensional stability, and the equipment required for subsequent dipping and sanding is larger. Large, high requirements for equipment

Moreover, due to the large size of the wax pattern, it is necessary to assist the manipulator when dipping the slurry and showering the sand, and it cannot be operated manually.

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