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Precise Temperature Measurement Method for Sand Casting Based on Positioning of Temperature Measurement Unit

A technology of sand casting and temperature measurement, which is applied in the parts of thermometers, thermometers, and heat measurement, and can solve problems that need to be improved.

Active Publication Date: 2021-03-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing temperature measurement methods for sand casting still need to be improved

Method used

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  • Precise Temperature Measurement Method for Sand Casting Based on Positioning of Temperature Measurement Unit
  • Precise Temperature Measurement Method for Sand Casting Based on Positioning of Temperature Measurement Unit
  • Precise Temperature Measurement Method for Sand Casting Based on Positioning of Temperature Measurement Unit

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Experimental program
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Effect test

Embodiment 1

[0060] The precise measurement steps of the temperature field in the aluminum alloy sand casting process are as follows:

[0061] 1. Design the temperature measurement unit. The temperature measurement unit includes three parts: sand block, limit block and thermocouple. The sand block is the main body of the temperature measuring unit, which is made of the same material as the molding sand to avoid the disturbance of the temperature field caused by different materials. The limit block is used to locate the thermocouple in the sand block, and it plays a positioning role. It can be processed with aluminum, iron and other alloys. After the positioning is completed, it will be taken out of the temperature measurement unit. The casting used for the experimental test is a flat casting of 200mm×200mm×20mm. The shape of the sand block is designed according to the shape of the casting surface to ensure that it can fit the casting surface. Corresponding positioning grooves are process...

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Abstract

The invention discloses a sand casting temperature measurement method based on the positioning of a temperature measurement unit. The method includes: (1) using a limiting block, a thermocouple and molding sand to make a temperature measuring unit: (1-1) the limiting block includes a positioning groove, by inserting the thermocouple into the positioning groove, and using the molding sand on the outer surface of the limiting block Carry out sand filling molding to form sand blocks on the outer surface of the limiting block; harden the molding sand to obtain the precursor of the temperature measuring unit; (1-2) take the limiting block out of the precursor of the temperature measuring unit, Fill the position of the block with molding sand to form a temperature measuring surface; harden the molding sand to obtain a temperature measuring unit; (2) use the temperature measuring unit and molding sand to make a mold; (3) use the mold for sand casting, the process of sand casting In this method, the temperature of the interface to be measured is measured by a thermocouple. In this method, the temperature measuring unit is made by means of the limiting block and the sand block, and the temperature measuring thermocouple in the molding sand can be precisely positioned, so as to realize the accurate measurement of the temperature field change in the sand casting process.

Description

technical field [0001] The invention relates to the field of sand casting technology, in particular, the invention relates to a precise temperature measurement method for sand casting based on the positioning of a temperature measuring unit. Background technique [0002] During the casting process, the high-temperature molten metal fills the mold cavity and gradually solidifies under the cooling of the mold to form practical parts. Castings may form various defects such as shrinkage cavity, shrinkage porosity, and segregation during solidification, and the generation of these defects largely depends on the heat transfer behavior between the casting and the mold. Determining the heat transfer behavior of the casting-mold interface and obtaining the change law of the interface heat transfer coefficient over time can predict the entire solidification process of the casting, thereby predicting the occurrence of defects, guiding process optimization, and improving casting quality...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/04G01K1/143G01K1/14
CPCG01K7/04G01K1/14
Inventor 张昂郭志鹏熊守美
Owner TSINGHUA UNIV
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