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Casting device of low tension fine grain and method thereof

A fine-grained, low-pressure technology, applied in the field of foundry metallurgy, can solve the problems that large-scale casting methods are not suitable and cannot be used in pressure-regulated casting methods, etc. Effect

Inactive Publication Date: 2012-04-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, neither of these two methods can be used for pressure regulating casting, nor is it suitable for large-scale casting methods.

Method used

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  • Casting device of low tension fine grain and method thereof
  • Casting device of low tension fine grain and method thereof
  • Casting device of low tension fine grain and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2-4

[0034] Based on the device described in Example 1, for the K4169 superalloy melt, the filling rate is controlled to vary from 0.1 to 1 m / s, and the melt temperature is adjusted by the power of the melting device and a thermocouple, and is appropriately changed with the change of the filling rate.

[0035] The low-pressure fine-grain casting method includes the following steps:

[0036] Step 1: put the refiner into the refiner storage, and connect the sprue mouth pipe;

[0037] Step 2: Then pour aluminum melt or superalloy melt into the crucible, and turn on the pressure regulating casting device;

[0038] Step 3: During the mold filling process, the gas filling rate is adjusted by the air pressure regulating device to control the filling rate so that the superalloy melt rises from the crucible along the riser at a set rate; when the melt flows through the refiner storage At this time, due to the momentum and temperature of the fluid, the refiner will be mixed, melted, and bro...

Embodiment 2

[0040] Example 2: When the filling speed is 0.1m / s, when the casting is solidified under the pressure of 0.6Mpa, the shrinkage porosity ratio in the casting is 3%, and when the melt temperature is 1400°C, the superalloy grain size is 8mm.

Embodiment 3

[0041] Example 3: When the filling rate is 0.5m / s, the melt temperature is 1390°C, and the casting is solidified under a pressure of 0.6Mpa, when the shrinkage-porosity ratio in the casting is 3%, the superalloy grain size is 3mm.

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Abstract

The invention discloses a low tension fine grain casting device and a method thereof. The device comprises an upper chamber, a lower chamber, a top cover, a casting mold, a melt device, a liquid lift tube, a refiner memorizer, an air pressure regulating device, a pressure bearing plate. The refiner memorizer is placed between the liquid lift tube and the casting mold gate, and the liquid lift tube is fixed on the pressure bearing plate; the casting mold is placed in the upper chamber within the furnace, the periphery being filled with fine grains; the melt device is placed underneath the liquid lift tube, being concentric with the liquid lift tube; the air regulating device is circumscribed with a vacuum pump, a pressure tank and a connection valve by the flange plates in the upper chamber and the lower chamber so as to regulate the air pressure in the upper chamber and the lower chamber. The invention is reasonable in structure, advanced in technology and easy to operate. By arranging the refiner memorizer between the liquid lift tube and the casting mold gate, and utilizing the melt and flow of metal liquid, the refiner is carried into the casing mold, and meanwhile, the melt temperature while being carried into the casting mold is reasonably lowered so as to achieve the purposes of grain refining and shrinking looseness reduction.

Description

technical field [0001] The present invention relates to a device and method in the technical field of foundry metallurgy, in particular to a device and method that increases nucleation cores by increasing homogeneous particles or heterogeneous particles, and utilizes adjustable pressure-regulating casting during the casting process. characteristics, control its process parameters, adjust the amount of refiner entering the melt, and control the device and method of refinement process. Background technique [0002] Adding a refiner to refine the solidified structure of the alloy is a process that has been widely industrialized. During smelting, crystal nuclei can be formed by adding a refiner to the melt, so that the coarse as-cast structure becomes fine equiaxed grains to achieve grain refinement, thereby improving the casting performance, physical properties, and mechanical properties of the alloy and processing performance. There are three main types of refiners: alloy fi...

Claims

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Application Information

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IPC IPC(8): B22D18/04
Inventor 张佼余志文李发国孙宝德王俊疏达韩延峰戴永兵
Owner SHANGHAI JIAO TONG UNIV
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