Laser heating measurement device and method for interface heat transfer coefficient and material thermal conductivity

An interface heat transfer coefficient and laser heating technology, applied in the field of material thermal properties, can solve the problems of inaccurate, uneven heating temperature, slow heating rate, etc., to improve the application range and service life, and simplify the test steps.

Active Publication Date: 2022-07-15
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an interface heat transfer coefficient for the existing measurement methods and measurement devices, such as slow heating rate, inaccurate and uneven heating temperature, and inability to meet the needs of materials at high and stable temperatures. Laser heating measurement device and measurement method for material thermal conductivity, used to measure the interface heat transfer coefficient between casting material and mold metal material under different interface pressure, heating temperature, interface surface roughness and surface coating thickness, and different Thermal conductivity of metallic materials at heating temperature

Method used

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  • Laser heating measurement device and method for interface heat transfer coefficient and material thermal conductivity
  • Laser heating measurement device and method for interface heat transfer coefficient and material thermal conductivity
  • Laser heating measurement device and method for interface heat transfer coefficient and material thermal conductivity

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Example 1: Thermal Conductivity Measurements of Casting Specimens

[0067] A. The selection of the second combined sample 21 and the setting of the thermocouple 5:

[0068] like figure 2 As shown, the standard sample 211 is a cylindrical brass with a diameter of 12.5 mm and a length of 60 mm, and its thermal conductivity is known, and the second casting sample 213 is a cylindrical A357 aluminum alloy with a diameter of 12.5 mm and a length of 75 mm; The side of the lower surface of the sample 211 in contact with the second casting sample 213 should be smooth enough to reduce the influence of the surface roughness on the test results.

[0069] In order to accurately obtain the axial temperature inside the second composite sample 21, four blind holes for installing the thermocouple 5 are opened on the outer surface of the second casting sample 213 at equal intervals (the spacing is 15 mm). Three blind holes for installing thermocouple 5 are opened on the outer surface ...

Embodiment 2

[0086] Example 2: Thermal Conductivity Measurement of Cast Specimens

[0087] A. The selection of the second combined sample 21 and the setting of the thermocouple 5:

[0088] The second casting sample 213 in Example 1 is replaced by a second casting sample 212, which is a cylindrical H10 steel with a diameter of 12.5 mm and a length of 75 mm, considering that the thermal conductivity belongs to the material Internal properties, so its surface does not need to be sprayed with a surface casting coating.

[0089] Then, according to parts B and C in Example 1, the thermal conductivity of the second casting mold sample 212 at each set heating temperature can be measured.

Embodiment 3

[0090] Example 3: Measurement of Interface Heat Transfer Coefficient

[0091] A. The selection of the first combined sample 3 and the setting of the thermocouple 5:

[0092] The first casting sample 302 is a cylindrical A357 aluminum alloy with a diameter of 12.5 mm and a length of 60 mm; the first casting sample 301 is a cylindrical H10 steel with a diameter of 12.5 mm and a length of 75 mm, and the casting coating 22 on the surface is sprayed In order to reduce the influence of surface roughness on the test results, the surface of the first casting sample 301 in contact with the first casting sample 302 should be smooth enough.

[0093] In order to accurately obtain the axial temperature inside the first combined sample 3, four blind holes for installing the thermocouple 5 are opened on the outer surface of the first casting sample 301 at equal intervals (the spacing is 15 mm). On the outer surface of the sample 302, three blind holes for installing the thermocouple 5 are o...

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Abstract

A laser heating measurement device and method for interface heat transfer coefficient and material thermal conductivity, the bottom of the box cavity is provided with a laser heating component and a heat-insulating and high-temperature support seat, and the top of the box cavity is provided with a cooling water tank, a heat-insulating high-temperature support seat and a cooling water tank There is a sample assembly in the box between the two, the sample assembly and the side wall of the box are insulated by an annular thermal insulation layer, the cooling water tank is close to the upper end of the sample assembly to cool the sample assembly, and can be driven by pressure. The sample assembly is pressurized downward toward the laser heating assembly; a pressure sensor is installed on the pressure drive of the cooling water tank; a temperature collection element is installed on the temperature collection point of the sample assembly; the laser heating assembly is connected with the optical fiber of the laser generator outside the box ; During the operation of the device, the laser heating castings uniformly heats the lower surface of the combined sample, the cooling water tank cools the lower surface uniformly, and the side is insulated, which ensures the one-dimensional heat transfer inside the combined sample along the length of the sample, and is used for thermal conductivity. Measurement of rate and interfacial heat transfer coefficient.

Description

technical field [0001] The invention relates to the field of material thermal properties, in particular to a laser heating measuring device and a measuring method for measuring interface heat transfer coefficient and material thermal conductivity in a metal mold casting process. Background technique [0002] In today's world, casting simulation software is an essential technology tool for any thriving foundry. There are many casting process simulation software in the global market, the main function is to simulate the flow of molten metal, the solidification process, as well as the mechanical properties and stress of castings during solidification and cooling, and predict casting process defects in advance. Using these casting simulation software can save a lot of time and cost during the pilot production stage of casting products, and can give technicians a better understanding of the flow and solidification of molten metal in the mold cavity. [0003] In the process of ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 何博田运灿蒋梦麒潘宇飞
Owner SHANGHAI UNIV OF ENG SCI
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