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A measuring device and measuring method for interface heat transfer coefficient and material thermal conductivity

A technology of interface heat transfer coefficient and measuring device, which is applied in the direction of material thermal conductivity, etc., to achieve the effect of accurate thermal conductivity measurement, simplified test steps, and accurate heat transfer coefficient measurement.

Active Publication Date: 2022-02-18
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a measuring device and measuring method for interface heat transfer coefficient and material thermal conductivity, which are used to measure different interface pressure, heating temperature, interface surface The interface heat transfer coefficient between solid casting material and mold metal material under roughness and surface coating thickness, the interface heat transfer coefficient between molten casting material and mold metal material under different gas pressure, heating temperature and surface coating thickness, And the thermal conductivity of metal materials at different heating temperatures

Method used

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  • A measuring device and measuring method for interface heat transfer coefficient and material thermal conductivity
  • A measuring device and measuring method for interface heat transfer coefficient and material thermal conductivity
  • A measuring device and measuring method for interface heat transfer coefficient and material thermal conductivity

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Experimental program
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Effect test

Embodiment 1

[0083] Embodiment 1: The thermal conductivity measurement of casting sample

[0084] A. The selection of the third combined sample 21 and the setting of the thermocouple 5:

[0085] The standard sample 211 is a cylindrical brass with a diameter of 50 mm and a length of 75 mm, and the third casting sample 213 is a cylindrical A357 aluminum alloy with a diameter of 50 mm and a length of 60 mm; the lower surface of the standard sample 211 is the same as the third casting sample. The contact side of sample 213 should be smooth enough to reduce the influence of surface roughness on test results.

[0086] In order to accurately obtain the axial temperature inside the third combined sample 21, four blind holes for installing thermocouples 5 are provided at equal intervals (15mm apart) on the outer surface of the standard sample 211, and in the third casting sample 213 Three blind holes for installing thermocouples 5 are opened on the outer surface at equal intervals (15 mm interval)...

Embodiment 2

[0102] Embodiment 2: the thermal conductivity measurement of mold sample

[0103] A, the third casting sample 213 in embodiment 1 is replaced by the third mold sample 212, the third mold sample 212 is a cylindrical H10 steel with a diameter of 50 mm and a length of 60 mm, considering the thermal conductivity It belongs to the internal nature of the material, so its surface does not need to be sprayed with surface mold coating.

[0104] Then proceed according to Parts B and C in Example 1 to measure the thermal conductivity of the third mold sample 212 at each set heating temperature.

Embodiment 3

[0105] Embodiment 3: the measurement of solid-solid interface heat transfer coefficient

[0106] A. The selection of the first combined sample 3 and the setting of the thermocouple 5:

[0107] The first casting sample 302 is a cylindrical A357 aluminum alloy with a diameter of 50 mm and a length of 60 mm; the first casting sample 301 is a cylindrical H10 steel with a diameter of 50 mm and a length of 75 mm, and the mold coating 22 on the surface is sprayed The surface of the first mold sample 301 in contact with the first casting sample 302 must be smooth enough to reduce the impact of surface roughness on the test results.

[0108] In order to accurately obtain the axial temperature inside the first composite sample 3, four blind holes for installing thermocouples 5 are provided at equal intervals (15 mm apart) on the outer surface of the first casting mold sample 301. Three blind holes for installing thermocouples 5 were opened on the outer surface of sample 302 at equal in...

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Abstract

A measuring device and method for measuring interface heat transfer coefficient and material thermal conductivity. A heating component is fixed outside one end of the box, the heating chamber of the heating component communicates with the inner cavity of the box, and a cooling water tank is installed inside the other end of the box. There is a sample assembly in the box between the heating assembly and the cooling water tank, and the heat insulation between the sample assembly and the side wall of the box is insulated by an annular thermal insulation layer; one end of the intake and exhaust pipe extends into the heating chamber of the heating assembly, The other end protrudes out of the box and is connected to the external environment and the pressure gas source respectively through a three-way valve; the air pressure sensor in the heating chamber of the heating component and the pressure sensor on the pressure drive of the cooling water tank are respectively connected to the signal of the pressure signal acquisition module The temperature acquisition element on the sample assembly is connected to the temperature signal acquisition module; the pressure signal acquisition module and the temperature signal acquisition module are respectively electrically connected to the control module. This device is used for the measurement of thermal conductivity, solid-solid interface and solid-liquid interface heat transfer coefficient.

Description

technical field [0001] The invention relates to the field of thermal physical properties of materials, in particular to a measuring device and a measuring method for simultaneously measuring solid-solid and solid-liquid interface heat transfer coefficients and material thermal conductivity in a metal mold casting process. Background technique [0002] With the rapid development of the automobile industry, extremely high requirements have been put forward for its lightweight, and the application of high-performance aluminum alloys in automobile parts has become more and more extensive. Among them, aluminum alloy metal mold casting is one of the main forming processes for complex components, which has the characteristics of large batch size and good process stability. In its process design, computer simulation technology can greatly shorten the research and development cycle and improve the qualification rate, so it is widely used. [0003] In the simulation calculation of me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/18
CPCG01N25/18
Inventor 何博田运灿姚定烨潘宇飞
Owner SHANGHAI UNIV OF ENG SCI
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