A Simple Back Calculation Method for Measuring Casting Interface Heat Transfer Coefficient

A simple and convenient technology for interface heat transfer coefficient, which can be used in calculations, computer-aided design, CAD numerical modeling, etc., and can solve problems such as difficult operation, high cost, and cumbersome process.

Active Publication Date: 2021-07-06
DONGFANG TURBINE CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Such methods are too costly, cumbersome, and difficult to operate in terms of embedding thermocouples and measuring temperature.

Method used

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  • A Simple Back Calculation Method for Measuring Casting Interface Heat Transfer Coefficient
  • A Simple Back Calculation Method for Measuring Casting Interface Heat Transfer Coefficient
  • A Simple Back Calculation Method for Measuring Casting Interface Heat Transfer Coefficient

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Embodiment Construction

[0030] In this embodiment, the casting is formed by the method of investment precision casting. The casting structure is a cylinder of Φ20×80, and the tree diagram of the casting and gating system can be found in figure 1 .

[0031] The present invention comprises the following sequential steps:

[0032] 1) Design a casting 1 with a cylindrical structure of Φ20×80, which has the characteristics of simple structure, convenient forming, and easy sampling;

[0033] Generally speaking, the mold-casting interface has an irregular shape, and the heat transfer coefficients at different positions on the interface are not the same, which brings difficulties to the measurement. Therefore, cylindrical or flat castings are generally used to measure the interface heat transfer coefficient. In order to reduce the influence caused by the inhomogeneity of the interface heat transfer coefficient.

[0034] 2) Design the investment casting process plan, use the tree-building method of one bel...

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Abstract

The invention discloses a simple back calculation method for measuring the heat transfer coefficient of a casting interface, comprising the steps of: 1) designing a standard casting structure; 2) designing a casting process scheme and molding the casting; 3) sampling different positions on the surface of the standard casting, And after numbering in sequence, do metallographic analysis to obtain the secondary dendrite spacing data of each sample; 4) Calculate the cooling rate corresponding to the secondary dendrite spacing of each sample; 5) Calculate the temperature field value of the casting process plan Simulation analysis, and set the initial interface heat transfer coefficient, extract the cooling rate of the mushy zone; 6) According to the back calculation principle, the cooling rate calculated by the experiment and the simulated cooling rate are fitted and back calculated to solve the required interface heat transfer coefficient. This method can effectively measure and back-calculate the interface heat transfer coefficient without the temperature measurement process, and is convenient to implement and has high accuracy. It is also a general method for the interface heat transfer coefficient of various casting methods.

Description

technical field [0001] The invention relates to a theoretical measurement method for the interface heat transfer coefficient in the casting process, in particular to a back calculation method for simply measuring the casting interface heat transfer coefficient. Background technique [0002] In recent years, with the rapid development of computer technology, numerical simulation technology has become an important means of casting process control, process design and optimization. Among them, the interface heat transfer coefficient is of great significance as an important setting parameter for the numerical simulation of the temperature field in the casting process. The accuracy of the interface heat transfer coefficient is directly related to the accuracy of the flow field, temperature field, and stress field simulation, and affects the prediction and optimization of casting defects and performance. [0003] At present, the conventional theoretical method for measuring the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/10G06F119/08
CPCG06F30/20G06F2119/08
Inventor 郭雄高振桓张琼元李海松陶飞杨啊涛巩秀芳杨功显
Owner DONGFANG TURBINE CO LTD
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