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Shell mould having a heat shield

By using a heat shield and reinforcing rib structure that completely surrounds the main axis in the shell mold, the problem of tilting the front end of the crystallization extension in the prior art is solved, directional solidification in the casting cavity is achieved, and the thermomechanical properties of the metal parts are improved. .

Active Publication Date: 2015-05-27
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION (S N E C M A)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inclined extended front most likely to cause nucleation of unwanted particles in the casting cavity
However, it has been found to be difficult to prevent such tilting, especially in complex shaped casting cavities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] figure 1 Shows how gradual cooling of molten metal to achieve directional solidification is performed in a casting process. In this gradual cooling step, after the molten metal has been cast into the shell mold 1 , said shell mold 1 , supported by cooled and movable supports 2 , is heated downwards along the main axis X from the heated It is pulled out from chamber 3.

[0030] The housing mold 1 comprises a central cylinder 4 extending along a main axis X between a casting cup 5 and a plate-shaped base 6 . This substrate 6 is in direct contact with the support 2 during removal of the housing mold 1 from the heater chamber 3 . The shell mold 1 also comprises a plurality of casting cavities 7 arranged as an assembly around the central cylinder 4 . Each casting chamber 7 is connected to the casting cup 5 by a delivery channel 8 through which molten metal is introduced during the casting process. Each casting cavity 7 is connected at the bottom via a baffle selector 9 t...

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PUM

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Abstract

The invention relates to the field of casting, and more particularly to a shell mould (1), and also to methods for manufacturing and using such a shell mould (1). This shell mould (1) has a central cylinder (4), a plurality of moulding cavities (7) that are arranged in a cluster around the central cylinder (4) and at least one heat shield (13) approximately perpendicular to a main axis (X). The central cylinder (4) extends, along said main axis (X), between a pouring cup (5) and a base (6). Each moulding cavity is connected to the pouring cup (5) by at least one inlet duct (8), and also, by a chicane-type selector (9), to a starter (10) in the base (6). The at least one heat shield (13) completely surrounds each of said moulding cavities (7) in a plane approximately perpendicular to said main axis (X).

Description

technical field [0001] The present invention relates to the field of casting, and more particularly to shell molds, and methods of making and using such shell molds. Background technique [0002] The so-called "lost wax" casting method or "lost mold" casting method has been known since ancient times. They are particularly suitable for the manufacture of metal parts with complex shapes. As such, lost foam casting is particularly used in the manufacture of turbine engine blades. [0003] In lost foam casting, the first step typically involves forming a pattern from a material with a relatively low melting temperature, such as wax or resin, and then overmolding the mold onto the pattern. After the pattern's material is removed from the inside of the mould, molten metal is cast into the mold to fill the cavity from which the pattern is removed to form within the mould, hence the name. Once the metal cools and solidifies, the mold can be opened or destroyed to restore the meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
CPCB22C9/04B22D27/045C30B11/003C30B29/52B22C9/22B22D25/02B22D30/00B22D41/00B22C7/02B22D27/04
Owner SN DETUDE & DE CONSTR DE MOTEURS DAVIATION (S N E C M A)