Core making technology for investment casting

A technology of investment casting and manufacturing technology, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of low thermal expansion rate, achieve the effects of reducing firing shrinkage and improving deformation resistance

Inactive Publication Date: 2017-09-05
东风精密铸造安徽有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Low thermal expansion rate and stable size

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] The invention provides a technical solution, a core manufacturing process for investment casting, comprising the following steps:

[0031] (1) Slurry preparation: Put zircon powder and quartz glass in a ball mill for 2-4 hours, take them out and dry them to make the moisture content lower than 0.2% by weight, and then add a stirrer to stir to prepare a slurry;

[0032] (2) Forming: Forming by hot pressing;

[0033] (3) Bowl filling: bury the pressed ceramic core body in a bowl filled with fillers to prevent the core from being deformed and damaged during the firing process;

[0034] (4) Filler: Use industrial alumina roasted at 1300°C for 4-6 hours as filler;

[0035] (5) Modeling: Modeling on a vibrating table with an amplitude of 0.2-0.5mm;

[0036] (6) Roasting: It is divided into two stages: wax removal and sintering.

[0037] Generally speaking, the higher the pressure and the lower the injection temperature, the smaller the deformation of the ceramic core body ...

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PUM

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Abstract

The invention discloses a core manufacturing process for investment casting, which includes the following steps: (1) Slurry preparation: put zircon powder and quartz glass in a ball mill for 2-4 hours, take them out and dry them, Make the moisture content lower than 0.2% by mass, and then add a stirrer to stir to obtain a slurry; (2) Forming: forming by hot pressing; (3) Bowl filling: bury the pressed ceramic core body in a container In the bowl of the filler, prevent the core from being deformed and damaged during the firing process; (4) filling filler: use industrial alumina baked at 1300°C for 4‑6h as filler; (5) shape: at an amplitude of 0.2‑0.5mm (6) Roasting: It is divided into two stages: wax removal and sintering. The core produced by this process can obviously improve the anti-deformation ability of the core, and reduce the shrinkage of the core during firing, and obtain High performance and high quality core.

Description

technical field [0001] The invention relates to the technical field of investment casting, in particular to a core manufacturing process for investment casting. Background technique [0002] In addition to being surrounded by molten metal and under harsh working conditions like conventional casting, cores for investment casting also need to withstand the effects of dewaxing and roasting. To this end, the core should meet the following requirements: [0003] 1. High refractoriness [0004] The refractoriness of the core should be at least higher than the pouring temperature of the alloy to ensure that it will not soften and deform during pouring and solidification of the casting. In general, the refractoriness of the core should be above 1400°C. In the case of directional solidification and single crystal casting, it is required to be able to withstand the high temperature of 1520-1600°C for more than 30 minutes. [0005] 2. Low thermal expansion rate and stable size [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/10
CPCB22C9/10
Inventor 鲁茂波
Owner 东风精密铸造安徽有限公司
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