Precision-investment casting method

A technology of investment precision casting and investment molding, which is applied in the direction of casting molding equipment, molds, mold components, etc., can solve the problems of uneven structural strength, poor pressure bearing capacity, increased energy consumption, etc., and achieve the goal of saving manpower and material resources Effect

Inactive Publication Date: 2009-04-15
泉州腾达精铸有限公司
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Problems solved by technology

It can be seen that it is a known technology to obtain castings by investment casting, but for parts with multiple dispersed heat nodes, due to the cooling shrinkage of the cast material and the small wall thickness between adjacent heat nodes of the casting itself As a result, the filling of the casting liquid is insufficient, and the internal structure of the casting produced is poor, the structural strength is uneven, and the pressure bearing capacity is poor.
If the number of risers is increased on the investment casting mold shell, it will lead to a large amount of subsequent processing and increase energy consumption

Method used

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Embodiment Construction

[0015] refer to figure 1 and figure 2 , the embodiment discloses an investment casting method, comprising the following steps:

[0016] 1. Make a wax mold that is consistent with the casting and includes the riser 1, and set a core head on the hot joint 2 of the casting corresponding to the wax mold that is far away from the riser 1, and the core head and the wax mold are integrally formed;

[0017] 2. Make a silica sol investment pattern according to the wax pattern, and wipe off the floating sand at the end of the mud core head after the production is completed and ensure that it is located outside the silica sol investment pattern; on this premise, prepare the silica sol investment pattern The process is a known technique, which is fully disclosed in the documents mentioned in the background;

[0018] 3. Place the prepared silica sol investment mold at a temperature of 110°C to 120°C for lost wax treatment to obtain a mold shell, which contains a reserved opening corresp...

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Abstract

The invention provides a method for casting a fusible pattern precisely, which comprises the following steps: manufacturing a wax pattern in accordance with a cast product, wherein the wax pattern comprises a casting head and a core print corresponding to structures of an internal chill or an external chill; manufacturing a silicasol fusible pattern according to the wax pattern, and performing dewaxing and solidifying processes to obtain a shuttering which contains a reserved opening corresponding to the core print; placing the external chill or the internal chill which is designed well according to a dispersed thermal centre of the cast product into the shuttering from the reserved opening; pouring molten metal into a die cavity in the shuttering to obtain the cast product; cutting and separating the casting head of the cast product after the mould is opened, and removing the external chill or finishing a protruding part of the internal chill to obtain the finished product. The method is applicable in the field of casting high-precision parts.

Description

technical field [0001] The invention relates to a metal casting method, in particular to an investment precision casting method. Background technique [0002] The Chinese patent CN101138781A announced on March 12, 2008 discloses an investment casting mold shell and its manufacturing method. The sand-sprinkling material between coatings, the refractory coating of the reinforcement layer includes silica lime powder, which can increase the strength of investment casting formwork, reduce the number of coating layers for formwork manufacturing and reduce the number of iron wires tied. It can be seen that it is a known technology to obtain castings by investment casting, but for parts with multiple dispersed heat nodes, due to the cooling shrinkage of the cast material and the small wall thickness between adjacent heat nodes of the casting itself As a result, the filling of the casting liquid is not sufficient, and the inner structure of the casting produced is poor, the structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D15/00B22D31/00
Inventor 邓元华
Owner 泉州腾达精铸有限公司
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