Precision casting method for thin-wall high-temperature alloy floating wall tiles

A high-temperature alloy and precision casting technology, which is applied in the field of high-temperature alloy casting, can solve the problems of slow solidification cooling rate of castings and high heat preservation temperature of mold shells, and achieve the effects of grain refinement, improvement of casting performance, and promotion of heat transfer

Inactive Publication Date: 2016-05-18
XIAN JIAOTONG UNIV CITY COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent is aimed at larger castings, the mold shell insulation temperature is higher, and the solidification and cooling rate of the casting is slower

Method used

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  • Precision casting method for thin-wall high-temperature alloy floating wall tiles
  • Precision casting method for thin-wall high-temperature alloy floating wall tiles

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Experimental program
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Effect test

Embodiment 1

[0019] This embodiment is a high-temperature alloy floating wall tile precision casting technology. The casting material is a K4169 high-temperature alloy with a solidus temperature of 1270°C and a liquidus temperature of 1349°C. refer to figure 1 , the specific steps of this embodiment are as follows:

[0020] Step 1. Preparation of the formwork: The preparation technology of the formwork is the existing technology. The existing 3D rapid prototyping system is used to prepare the floating wall tile wax pattern, and the pouring system is added to form the module group. After cleaning, repeated sanding, and removal Waxed and baked to obtain the mold shell;

[0021] Step 2, refer to figure 1 Heating and insulation of the mold shell: place the K4169 superalloy in the crucible of the induction coil of the directional solidification vacuum induction furnace; place the obtained mold shell in the mold shell heating furnace of the directional solidification vacuum induction furnace; ...

Embodiment 2

[0026] The concrete steps of this embodiment are as follows:

[0027] Step 1. Preparation of the formwork: The preparation technology of the formwork is the existing technology. The existing 3D rapid prototyping system is used to prepare the floating wall tile wax pattern, and the pouring system is added to form the module group. After cleaning, repeated sanding, and removal Waxed and baked to obtain the mold shell;

[0028] Step 2, heating and heat preservation of the formwork: place the K4169 superalloy in the crucible of the induction coil of the directional solidification vacuum induction furnace; place the obtained formwork in the formwork heating furnace of the directional solidification vacuum induction furnace; place the directional solidification The upper heating zone and the lower heating zone of the heating body of the vacuum induction furnace are heated to 1300°C and kept for 80 minutes to heat the mold shell and make the mold shell temperature uniform;

[0029] ...

Embodiment 3

[0034] This embodiment is a high-temperature alloy floating wall tile precision casting technology. The casting material is a K4169 high-temperature alloy with a solidus temperature of 1270°C and a liquidus temperature of 1349°C. The concrete steps of this embodiment are as follows:

[0035] Step 1. Formwork preparation: The preparation technology of the formwork is the existing technology. The existing 3D rapid prototyping system is used to prepare the floating wall tile wax pattern, and the pouring system is added to form the module group. After cleaning, repeated sanding, and removal Waxed and baked to obtain the mold shell;

[0036] Step 2, heating and heat preservation of the formwork: place the K4169 superalloy in the crucible of the induction coil of the directional solidification vacuum induction furnace; place the obtained formwork in the formwork heating furnace of the directional solidification vacuum induction furnace; place the directional solidification The uppe...

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Abstract

Provided is a precision casting method for thin-wall high-temperature alloy floating wall tiles. The precision casting method comprises the steps that firstly, a mold shell is processed and then subjected to heating and heat preserving; secondly, after alloy is heated and melted into alloy liquid, the alloy liquid is poured into the mold shell; and finally, after the mold shell is removed out of a heat preserving furnace, nitrogen is filled to increase the cooling rate, and thus casting of the K4169 high-temperature alloy floating wall tiles is completed. According to the precision casting method for the thin-wall high-temperature alloy floating wall tiles, the heat preserving temperature of the mold shell is increased to the temperature which is 10 DEGC-40 DEG C higher than a solid phase line to improve the mold-filling capacity of alloy melt, so that forming of a casting is ensured, the pouring system size is decreased, and the yield of the casting is increased; the alloy liquid is poured into the mold shell at the temperature which is 10 DEGC-32 DEG C higher than a liquid phase line, the temperature gradient of the solidification front of the melt is decreased, isometric crystals are formed, and casting deformation is relieved; after mold filling is completed, the casting is removed out of the heat preserving furnace to be cooled, protective atmosphere is simultaneously filled to promote heat transfer, the cooling efficiency is improved, refining of grain structures is achieved, and the casting performance is improved.

Description

technical field [0001] The invention relates to the technical field of superalloy casting, in particular to a precision casting method for thin-wall superalloy floating wall tiles. Background technique [0002] The floating wall cooling tile part is a thin-wall superalloy casting with a complex structure. It is characterized by a complex structure, ultra-thin, and very high precision requirements. It is widely used in advanced aero-engines. Due to its structural characteristics: more than 200 small bosses of 1.0mm are distributed on the tile with a wall thickness of about 1mm and 150mm×60mm, and the crystallization interval of the superalloy itself is wide, so the precision casting of this superalloy casting is extremely difficult. In order to solve such complex and thin-walled mold filling problems in conventional precision casting methods, higher pouring temperatures and larger-sized runner systems are usually used, but they are faced with poor forming quality, large defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04
CPCB22C9/046
Inventor 史艳莉黄太文介子奇
Owner XIAN JIAOTONG UNIV CITY COLLEGE
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