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Intelligent temperature control method for low-pressure casting of aluminum alloy melt

A technology of aluminum alloy melt and low pressure casting, applied in the field of aluminum alloy casting, can solve the problems of unmeasurable temperature of alloy melt, fluctuation of casting quality, low control accuracy, etc., to avoid adverse effects, improve accuracy and control accuracy. Effect

Active Publication Date: 2022-03-15
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide an intelligent temperature control method for low-pressure casting aluminum alloy melt, which is used to solve the problem of low control accuracy of existing temperature control methods and the unmeasurable temperature of the alloy melt after the low-pressure casting furnace body is sealed. Difficult to control, resulting in fluctuations in casting quality

Method used

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  • Intelligent temperature control method for low-pressure casting of aluminum alloy melt
  • Intelligent temperature control method for low-pressure casting of aluminum alloy melt
  • Intelligent temperature control method for low-pressure casting of aluminum alloy melt

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Embodiment 1

[0138] In this embodiment, β is the temperature control coefficient, and the temperature control coefficient β is selected as 0.05 based on experience.

[0139] Assuming that the real-time temperature T3 of the aluminum liquid is 700°C, the furnace gas equilibrium temperature T2 is set to be 15°C higher than the process control temperature of the aluminum liquid, that is, the furnace gas equilibrium temperature T2 is 715°C, and the temperature of the aluminum liquid can be kept basically stable at this temperature.

[0140] If the temperature of the molten aluminum is increased by 5°C, that is, △T2=5°C, that is, the process control temperature of the molten aluminum is T4=705°C, and the corresponding furnace gas equilibrium temperature T2 is 720°C. Set the start of temperature control as time t0, and the end of temperature control as time t1. Then the calculation process and result of the furnace gas temperature difference △T1(t0) at the moment t0 in the initial stage of tempe...

Embodiment 2

[0157] In the above example 1, if the actual temperature control coefficient β=△T2 / △T1=2.5°C / 50°C=0.05 is estimated to be inaccurate, at a certain tm moment, if the real-time temperature of the furnace gas rises to the highest value of 770°C Start to stop heating, that is, the furnace gas control temperature T1(tm) at this time is also 770°C, and the real-time temperature T3(tm) of the aluminum liquid measured at this time is 702.5°C. As the furnace gas temperature drops to the furnace gas equilibrium temperature T2, the real-time temperature T3 (t1) of the molten aluminum changes the process control temperature T4 to 705.5°C. Then during the cooling process, the actual furnace gas temperature difference △T1 is:

[0158] ΔT1=T1(tm)-T2=770°C-720°C=50°C;

[0159] The actual aluminum liquid temperature difference △T2 is:

[0160] ΔT2=T4-T3(tm)=705.5°C-702.5°C=3°C;

[0161] Then the actual temperature control coefficient β is:

[0162] β=ΔT2 / ΔT1=3°C / 50°C=0.06.

[0163]Then re...

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Abstract

The invention relates to an intelligent temperature control method for a low-pressure casting aluminum alloy melt, belongs to the technical field of aluminum alloy casting, and solves the problem of casting quality fluctuation caused by low control precision of an existing temperature control method. The intelligent temperature control method comprises the steps that 1, the real-time furnace gas temperature T (tn) at the tn moment is obtained in real time; 2, the furnace gas control temperature T1 (tn) at the tn moment under the set working condition is obtained through calculation; 3, the real-time temperature T (tn) of the furnace gas and the control temperature T1 (tn) of the furnace gas at the tn moment are judged; if T (tn) is smaller than T1 (tn), a heating device is started to heat the molten aluminum; if T (tn) is larger than or equal to T1 (tn), the heating device is closed, and heating of the molten aluminum is stopped; wherein n is a time sequence number. The control precision and efficiency of the aluminum alloy melt in the low-pressure aluminum alloy pouring process can be greatly improved, and stable control over the aluminum alloy melt is achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to an intelligent temperature control method for a low-pressure casting aluminum alloy melt. Background technique [0002] Existing aerospace and aviation high-quality aluminum alloy castings are generally produced by low and differential pressure casting processes. Among them, aluminum alloy melting and pouring are key processes in the casting process, and the quality of its control directly determines the quality of casting products. In this process, the melt temperature is a very important process parameter. In the actual operation process, the temperature of the aluminum alloy melt is generally measured manually with a hand-held thermocouple measuring device. After the measurement is completed, according to the process parameter requirements, the melt temperature is controlled according to manual experience. When pouring, since the melt temperature cannot be me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/08B22D18/04
CPCB22D18/08B22D18/04Y02P10/25
Inventor 杨锌边毅刘海鹏黄文忠李作为孙建新
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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