Method for preventing deformation of refined casting casing wax model

A wax mold and precision casting technology, which is applied in casting and molding equipment, etc., to simplify the operation process, reduce risks, and save production costs.

Inactive Publication Date: 2017-05-31
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for preventing the deformation of the precision casting casing wax mold, which simplifies the operation process and solves the quality problem of the wax mold deformation in the production process of the heavy-duty gas turbine casing

Method used

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  • Method for preventing deformation of refined casting casing wax model
  • Method for preventing deformation of refined casting casing wax model
  • Method for preventing deformation of refined casting casing wax model

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment is used for the precision casting of the C-type gas turbine bearing casing. It is composed of a 1 / 6 circle combination. The casing wall thickness varies greatly, and the wall thickness in some areas is only 3 to 4 mm. It is very easy to open and deform during production. Determine the molding process of the wax mold 1 according to the shape of the casing, and then determine the shape of the mold according to the shape of the wax mold 1 and make the mold. During production, a plurality of positioning blocks 2 for clamping the ribs 3 are opened on the mold. 2 Depressed on the surface of the mold, and then perform wax pressing operation on the mold to obtain a wax mold 1. The wax mold 1 also has a positioning block 2 adapted to the shape, position and size of the mold. After the wax mold 1 is cooled, the upper mold and the mold Remove each part of the live block separately, embed the reinforcement ribs 3 between the positioning blocks 2 of the wax mold 1 to c...

Embodiment 2

[0037] This embodiment is used for precision casting of the C-type gas turbine bearing casing, which is composed of a quarter circle combination, which is extremely easy to deform during production. Using the same processing method as in Example 1, the combined schematic diagram after the reinforcement rib 3 and the reinforcement rod 4 are embedded in the positioning block 2 of the wax mold 1 is as follows: image 3 As shown, the reinforcing rib 3 and the reinforcing rod 4 effectively prevent the deformation of the wax mold, and the final produced castings are tested by three-coordinate and reverse scanning, and the dimensional accuracy fully meets the design requirements.

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Abstract

The invention discloses a method for preventing deformation of a refined casting casing wax model. The method comprises the steps that the shape of the wax model and the shape of a mould for the wax model are determined according to the structure of a casing, and positioning blocks are arranged on the mould; the mould is subjected to wax injection, the wax model is obtained, and reinforcing ribs are embedded between the positioning blocks of the wax model and connected for structural reinforcement; the wax model is taken out of the mould to be detected; then a gating system and risers are welded to the wax model; and finally, shell making, casting pouring and thermal treatment are conducted, and cleaning is conducted before the casing is obtained. According to the method for preventing deformation of the refined casting casing wax model, the deformation situation of the wax model is considered in the mould design stage, the reinforcing ribs are designed, the positioning blocks are reserved, the well prepared reinforcing ribs are assembled on the wax model which is then taken out of the mould, accordingly deformation of the wax model is controlled, the deformation quality problem of the wax model in the production process of the heavy duty gas turbine casing is finally solved, the operating process is simplified by adoption of the method, and risks caused by calibration for the wax model are lowered; and a calibration mould and tool do not need to be made independently, and the production cost is lowered.

Description

Technical field [0001] The invention belongs to the technical field of precision casting, and specifically relates to a method for preventing the deformation of a wax mold of a precision casting casing. Background technique [0002] As one of the worst and most complex parts of heavy-duty gas turbines, the casing is mostly composed of 1 / 2, 1 / 4, and 1 / 6 circular structures, which require high dimensional accuracy, complex structure, and wall thickness. The difference is large, the internal quality requirements are strict, and deformation is prone to occur in the precision casting process. The deformation of castings in the precision casting process is usually caused by wax mold deformation, shell deformation, shrinkage deformation, heat treatment deformation, etc. [0003] Preventing wax mold deformation is the first step to prevent casting deformation. At present, most of the solution to wax mold deformation is to use tooling correction methods for prepared wax molds. This method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02
CPCB22C7/02
Inventor 巩红涛张威高磊王剑杨军杨国超王涛
Owner CSIC NO 12 RES INST
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