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A Vertical Centrifugal Precision Casting Method for Light Titanium Aluminum Turbine

A vertical centrifugal and turbine technology, which is applied in the field of lightweight titanium-aluminum turbine casting, can solve problems such as under-casting of blades, incomplete filling of thin-walled blades, shrinkage cavities, etc., and achieve the effect of ensuring shrinkage

Active Publication Date: 2020-01-07
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Literature (Numerical Simulation of High Nb-TiAl Supercharged Turbine Investment Casting Process, Yang Liang et al., Thermal Processing Technology, 2014, 43(9): 72-74) used numerical simulation to study the gravity casting process of titanium-aluminum turbines, and found that Thin-walled blade parts generally have incomplete filling phenomena such as under pouring and cold shutting
In order to solve the problem of incomplete filling of thin-walled blades, the author also proposed lateral centrifugal and top injection axial centrifugal technology. Although the use of centrifugal force field is beneficial to solve the problem of incomplete filling of thin-walled blades, the lateral Centrifugal turbines produce shrinkage defects on the blades, while top-injection axial centrifugal turbines produce large-sized shrinkage defects in the thick hub
Literature (TiAl-based alloy turbine fusion shell centrifugal precision casting, Su Yanqing et al., Rare Metal Materials and Engineering, 2002, 51(4): 295-298) has carried out the experimental verification of the lateral centrifugal casting process, but most of the cast turbine The blades are underwatered, and there is a problem of poor consistency of blade quality due to asynchronous filling of all blades
At present, the conventional gravity pouring and centrifugal pouring processes have failed to solve the problems of incomplete filling of thin-walled blades and loose defects in thick and large hubs.
[0005] In addition, the patent JP7116821 reported an anti-gravity casting process for a titanium-aluminum turbine. By applying an anti-gravity external field and sequential filling, a titanium-aluminum turbine casting with a complete blade filling and good metallurgical quality of the hub was prepared. However, due to the high differential pressure and filling rate required, this process is not suitable for casting larger titanium-aluminum turbines

Method used

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  • A Vertical Centrifugal Precision Casting Method for Light Titanium Aluminum Turbine
  • A Vertical Centrifugal Precision Casting Method for Light Titanium Aluminum Turbine
  • A Vertical Centrifugal Precision Casting Method for Light Titanium Aluminum Turbine

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Embodiment 1

[0034]The outer diameter of the turbine used is 100mm, the length of the blade is 35mm, the minimum thickness is about 0.7mm, and the maximum diameter of the hub is selected. The time is 3 seconds, the brake start time is 3 seconds before the end of centrifugal pouring, and the complete stop time is 4 seconds. Using the above-mentioned process, all the blades of the cast turbine castings are uniformly filled and complete, and no loose defects exceeding 100 μm are found in the hub part under a 100-fold optical microscope.

Embodiment 2

[0036] The outer diameter of the turbine used is 160mm, the length of the blade is 50mm, the minimum thickness is about 1.6mm, and the maximum diameter of the hub is optimized. The main process parameters are as follows: the pouring temperature is 1600°C, the preheating temperature of the sand box is 400°C, the centrifugal speed is 300rpm, and the melt is rotated The time is 5 seconds, the brake start time is 5 seconds before the end of centrifugal pouring, and the complete stop time is 6 seconds. Using the above-mentioned process, all the blades of the cast turbine castings are uniformly filled and complete, and no loose defects exceeding 100 μm are found in the hub part under a 100-fold optical microscope. It can be seen that the method described in this patent has a very significant effect on solving the insufficient feeding of the large-size turbine hub.

[0037] The main structural parameters and pouring process of the turbine in Embodiment 1 and Embodiment 2 are shown in...

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Abstract

The invention discloses a vertical type centrifugal precision-casting method for a light titanium aluminum turbine. The vertical type centrifugal precision-casting method for the light titanium aluminum turbine comprises the steps of (1) perpendicularly inverting a ceramic shell onto a centrifugal plate provided with a toggle clip, so that the ceramic shell, the toggle clip and the centrifugal plate are ensured to form an axial entirety; (2) after a titanium aluminum master alloy is completely fused, a centrifugal rotary motor is started, pouring a titanium aluminum melt into a cavity of the ceramic shell of the turbine after 5 to 10 seconds after the rotate speed of the centrifugal plate reaches to the setting rotate speed, and continuously rotating the centrifugal rotary motor for 3 to 10 sections after the melt enters the cavity; and (3) at 2 to 5 seconds before finishing centrifugal pouring, starting a forced brake device of the centrifugal rotary motor so as to enable the centrifugal plate to completely stop rotating within 3 to 8 seconds, and realizing feeding on a turbine hub. According to the vertical type centrifugal precision-casting method for the light titanium aluminumturbine provided by the invention, a thin-wall vane can be ensured to be mould-filled completely, and thick and large hub metallurgical quality can be further ensured.

Description

technical field [0001] The invention relates to the technical field of lightweight titanium-aluminum turbine casting, in particular to a vertical centrifugal precision casting method for a lightweight titanium-aluminum turbine. Background technique [0002] Titanium-aluminum alloy is a new type of lightweight high-temperature structural material with low density (about 3.9g / cm3), high specific stiffness, high specific strength and excellent oxidation resistance. Using this lightweight material to replace the nickel-based superalloy with a density of about 8.0g / cm3 to make a turbocharger can significantly reduce the moment of inertia of the turbine rotor, which will improve the transient response and performance of the turbocharged engine. At present, the application of lightweight titanium-aluminum alloy turbocharger is an inevitable development trend of turbocharging technology. [0003] However, due to the narrow solidification range of titanium-aluminum alloy melt, poor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/10C22C14/00
CPCB22D13/10B22D13/101C22C14/00
Inventor 朱春雷张继李胜王红卫胡海涛张熹雯
Owner CENT IRON & STEEL RES INST
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