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Machining method special for preventing hot cracking of vortex sheets

A processing method and technology of vortex blades, which are applied in the special processing field of vortex blades to prevent thermal cracking, can solve problems such as large curvature changes and thermal cracking of blades, and achieve the effects of reducing thermal stress, good wear resistance, and enhancing yield

Inactive Publication Date: 2020-12-15
MAANSHAN FANGYUAN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The supercharged turbine blades are thin and have large curvature changes. Therefore, when the turbine is cast by investment casting in actual production, the blades are prone to thermal cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A special processing method for preventing thermal cracking of vortex sheets, the specific operation steps are as follows:

[0018] (1) In an environment where the mold shell temperature is 950 °C and the pouring temperature is 1400 °C, after the K418 nickel-based solution is poured into the ingate, it flows into the mold shell by virtue of static pressure and fills the blades from bottom to top. The pouring time is 1s;

[0019] (2) Add 2% 100-mesh graphite powder to the 98% TiAl solution for mixing and stirring. After pouring the mixed solution into the sprue outside the mold shell, it flows into the mold shell by relying on static pressure. Keep the pouring temperature at 950°C and the pouring time is 0.8-1.5s;

[0020] (3) After the pouring is completed, wrap aluminum silicate felt with a thickness of 10mm on the outside of the mold shell, and then perform rapid cooling at a speed of 8°C / s. When the temperature drops to 950°C, stop the rapid cooling and keep for 3 m...

Embodiment 2

[0024] A special processing method for preventing thermal cracking of vortex sheets, the specific operation steps are as follows:

[0025] (1) In an environment where the mold shell temperature is 940°C and the pouring temperature is 1450°C, after the K418 nickel-based solution is poured into the inner runner, it flows into the mold shell by relying on static pressure and fills the blades from bottom to top. The pouring time is 0.5s;

[0026] (2) Add 2% 00-mesh graphite powder to 98% TiAl solution for mixing and stirring. After pouring the mixed solution into the outer sprue of the mold shell, it flows into the mold shell by relying on static pressure. Keep the pouring temperature at 1450°C and the pouring time is 1.1s;

[0027] (3) After the pouring is completed, wrap aluminum silicate felt with a thickness of 10mm on the outside of the mold shell, and then perform rapid cooling at a rate of 10°C / s. When the temperature drops to 940°C, stop the rapid cooling and keep for 5 m...

Embodiment 3

[0031] A special processing method for preventing thermal cracking of vortex sheets, the specific operation steps are as follows:

[0032] (1) In an environment where the mold shell temperature is 950 °C and the pouring temperature is 1400 °C, after the K418 nickel-based solution is poured into the ingate, it flows into the mold shell by virtue of static pressure and fills the blades from bottom to top. The pouring time is 2s;

[0033] (2) Add 10% 100-mesh graphite powder to 90% TiAl solution for mixing and stirring. After pouring the mixed liquid into the outer sprue of the mold shell, it flows into the mold shell by relying on static pressure. Keep the pouring temperature at 1400°C and the pouring time is 1.5s;

[0034] (3) After the pouring is completed, wrap aluminum silicate felt with a thickness of 10mm on the outside of the mold shell, and then perform rapid cooling at a rate of 5°C / s. When the temperature drops to 950°C, stop the rapid cooling and keep for 2 minutes; ...

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Abstract

The invention relates to a machining method special for preventing hot cracking of vortex sheets. The machining method comprises the following specific operation steps of (1) ingate pouring, (2) outerpouring gate pouring, (3) wrapping with aluminum silicate felt, (4) quenching and (5) shot blasting for obtaining a product. According to the machining method special for preventing hot cracking of the vortex sheets, by adopting the pouring conditions of high formwork temperature and low pouring temperature, on one hand, the stress generated in the solidification process is reduced, and on the other hand, the time of a casting in a hot crack sensitive area is further shortened; the deformability of a formwork is effectively enhanced by adding graphite powder, the generated stress is less than40MP, so that the hot crack tendency of the casting is favorably reduced; and the aluminum silicate felt is matched for use, the thermal insulation performance of the formwork is improved, the thermal stress is reduced, the working efficiency and precision are improved, the service life is prolonged, and the resistance to heat, pressure and abrasion is good.

Description

technical field [0001] The invention specifically relates to a special processing method for preventing thermal cracking of scroll sheets. Background technique [0002] Improving engine power performance, reducing fuel consumption and reducing exhaust pollution are the main goals of automobile engine development, and the use of turbocharging technology has become one of the effective measures to achieve the above goals. The turbocharger uses the exhaust gas energy from the engine to push the turbine in the turbine chamber, and the turbine drives the coaxial impeller, which compresses the air from the air filter and pressurizes it into the cylinder. When the engine speed increases, the intake air volume of the cylinder increases, thereby increasing the output power of the engine. In the new generation of small engines, the exhaust gas temperature even exceeds 850 °C in some areas, the turbine rotates fast, and the blades are subjected to various alternating stresses for a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16B22D27/04B22D30/00
CPCB22D19/16B22D27/04B22D30/00
Inventor 朱玉亮董金山郑有为何芳
Owner MAANSHAN FANGYUAN POWER TECH