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The Composite Modeling Method of Castings and Its Application

A compound molding and casting molding technology, which is applied in the direction of casting molding equipment, casting molds, and casting mold components, can solve the problem of accelerating the solidification and cooling rate of the main body of thick and large castings, slowing down the solidification and cooling rate of the riser of castings, and the inability to achieve refinement at the same time Problems such as the metallurgical quality of the core structure of the main body of the casting, to achieve the effect of accelerating the solidification cooling rate, slowing down the solidification cooling rate, and realizing the refinement of the structure

Active Publication Date: 2020-12-18
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a composite molding method for castings, which uses different cooling sands to perform composite molding on different parts of the casting, so as to accelerate the solidification cooling rate of the main body of thick and large castings and slow down the solidification cooling of the riser of the casting Simultaneous control of the speed solves the problem that a single sand molding cannot simultaneously refine the core structure of the main body of the casting and improve the metallurgical quality, which helps to improve the load-bearing level of the casting

Method used

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  • The Composite Modeling Method of Castings and Its Application
  • The Composite Modeling Method of Castings and Its Application
  • The Composite Modeling Method of Castings and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 Composite molding and casting of a titanium-aluminum supercharger turbine with an outer diameter of 100 mm

[0075] The turbine is formed by vertical centrifugal casting method, the outer diameter of hub 1 is 100mm, and the outer diameter of feeding riser 2 is 80mm; the casting process parameters include:

[0076] The pouring temperature is 1600-1650°C, the mold preheating temperature is 400-600°C, and the centrifugal speed is 600-1000rpm.

[0077] Composite modeling of cast turbines:

[0078] Such as figure 1 As shown in , the ceramic shell (1+2) of the turbine is placed in the sand box, the turbine hub 1 is on the bottom, the feeding riser 2 is on the top, and the hub surface is connected to the feeding riser;

[0079] Use 1.0~5.0mm granular and the particle size distribution is D 70 =3mm, thermal conductivity 407W·m -1 ·K -1 , heat storage coefficient 325W m -2 ·K -1 Copper molding sand 3 shapes the part below the hub surface of the turbine, and the ...

Embodiment 2

[0083] Example 2 Composite molding and casting of titanium-aluminum supercharger turbine with hub outer diameter of 160mm

[0084] The turbine is molded by vertical centrifugal casting method, the outer diameter of hub 1 is 160mm, and the outer diameter of feeding riser 2 is 100mm; the casting process parameters include:

[0085] The pouring temperature is 1600-1650°C, the mold preheating temperature is 200-400°C, and the centrifugal speed is 300-600rpm.

[0086] Composite modeling of cast turbines:

[0087] Such as figure 1 As shown in , the ceramic shell (1+2) of the turbine is placed in the sand box, the turbine hub 1 is on the bottom, the feeding riser 2 is on the top, and the hub surface is connected to the feeding riser;

[0088] Use 1.0~5.0mm granular and the particle size distribution is D 70 =2mm, thermal conductivity 200W·m -1 ·K -1 , heat storage coefficient 191W m -2 ·K -1 Aluminum molding sand 3 shapes the part below the hub surface of the turbine, and the ...

experiment example

[0097]Cut out the metallographic sample of the turbine hub core obtained by casting in Example 1, Example 2, and Comparative Examples 1 and 2, and after grinding and polishing using the standard metallographic sample preparation method, observe microscopic defects under an optical microscope at 100 times. The backscattered scanning electron microscope is used to count the interlamellar spacing according to the quantitative metallographic method of GB / T5749. Among them, the optical microscope adopts LEICA MEF4A image analyzer, and the backscattered scanning electron microscope adopts JEOL JSM7800 scanning electron microscope of JEOL Company.

[0098] Embodiment 1, 2 and comparative example 1, 2 turbine core quality comparison results are listed in table 1:

[0099] Table 1 Quality comparison results of turbine core

[0100]

[0101] From the results in Table 1, it can be found that:

[0102] Compared with Comparative Example 1, after adopting the composite molding method i...

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Abstract

The invention relates to a casting composite molding method and an application of the casting. According to the method, a main body of the casting is modeled by adopting rapid cooling molding sand, and a riser of the casting is modeled by adopting slow cooling molding sand. According to the method, different cooling sand is adopted for carrying out composite modeling on different parts of the casting, simultaneous controlling that the solidification cooling rate of the thick and large casting body is accelerated and the solidification cooling rate of the casting riser is reduced can be realized, the problem that a single molding sand molding cannot simultaneously realize refining of a core structure of the casting body and improving the metallurgical quality can be solved, and the bearinglevel of the casting can be improved. The invention further relates to a casting method of the casting employing the composite molding method.

Description

technical field [0001] The invention relates to the field of metal material casting, in particular to a composite modeling method for castings and its application. Background technique [0002] Precision castings, especially precision castings cast with new lightweight high-temperature structural materials titanium-aluminum alloys, such as titanium-aluminum alloy supercharger turbines, are currently manufactured by precision casting processes at home and abroad. Among them, titanium-aluminum turbines with a diameter of more than 100mm are mainly Vertical centrifugal casting process is adopted. [0003] A new type of lightweight high-temperature structural material, titanium-aluminum alloy, replaces the heavier nickel-based superalloy for the turbocharger turbine of the vehicle engine, which can greatly reduce the moment of inertia of the turbine shaft, significantly improve the acceleration response of the engine and the vehicle, and also has Significant energy saving and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/02B22C9/02B22C9/08B22C9/28
CPCB22C1/02B22C9/02B22C9/088B22C9/28
Inventor 朱春雷张继李胜胡海涛王红卫
Owner BEIJING CISRI GAONA TECH
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