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Method for measuring temperature change in magnesium alloy rolling process

A rolling process, temperature change technology, applied in metal rolling, metal rolling, temperature control and other directions, can solve the problems of difficult to obtain detection technology, limited direct detection of temperature rise, etc., to improve uniformity and accuracy, Guaranteed stability and accuracy, small heat loss before rolling

Active Publication Date: 2014-09-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the direct detection of the temperature rise caused by the deformation heat of magnesium alloys is limited by the detection technology and it is difficult to obtain accurate results

Method used

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  • Method for measuring temperature change in magnesium alloy rolling process
  • Method for measuring temperature change in magnesium alloy rolling process
  • Method for measuring temperature change in magnesium alloy rolling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Heating and melting the AZ31 magnesium alloy, pouring it into the casting device at 660°C to make a billet inlaid with a thermocouple, the homogenization treatment system is 430°C for 10 hours, and the surface is milled to obtain a slab to be rolled; The rolled slab is heated to 350°C in a heating furnace with a roller table and kept warm for 60 minutes, and then rolled in a rolling mill with a roll diameter of Ф380mm and the roll is not heated. The rolling speed is 100m / min; the pass reduction rate is 5%, and the slab to be rolled falls on the heat shield after being rolled; the obtained slab thickness direction center (H / 2), H / 4 and the temperature change curves near the surface layer with time are as follows Figure 4 △ in the figure is the temperature-time curve at H / 2, ○ is the temperature-time curve at 2mm from the surface, and the other is the temperature-time curve at H / 4.

Embodiment 2

[0047] Heating and melting the AZ31 magnesium alloy, pouring it into the casting device at 680°C to make a billet inlaid with a thermocouple, the homogenization treatment system is 350°C for 24 hours, and the surface is milled to obtain a slab to be rolled; The rolled slab is heated to 200°C in a heating furnace with a roller table and kept warm for 60 minutes, and then rolled in a rolling mill with a roll diameter of Ф380mm and the roll is not heated. The rolling speed is 5m / min; the pass reduction rate is 35%, and the slab to be rolled falls on the heat shield after being rolled; the temperature curves of the center (H / 2), H / 4 and the surface near the obtained slab thickness direction with time are as follows: Figure 5 △ in the figure is the temperature-time curve at H / 2, ○ is the temperature-time curve at 2mm from the surface, and the other is the temperature-time curve at H / 4.

Embodiment 3

[0049] Heating and melting the AZ31 magnesium alloy, pouring it into the casting device at 710°C to make a billet inlaid with a thermocouple, the homogenization treatment system is 400°C for 12 hours, and the surface is milled to obtain a slab to be rolled; The rolled slab is heated to 400°C in a heating furnace with a roller table and kept warm for 60 minutes, and then rolled in a rolling mill with a roll diameter of Ф380mm and the roll is not heated. The rolling speed is 300m / min; the pass reduction rate is 17%, and the slab to be rolled falls on the heat shield after being rolled; the temperature curves of the center (H / 2), H / 4 and the surface layer near the obtained slab thickness direction with time are as follows: Figure 6 △ in the figure is the temperature-time curve at H / 2, ○ is the temperature-time curve at 2mm from the surface, and the other is the temperature-time curve at H / 4.

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Abstract

The invention discloses a method for measuring the temperature change in magnesium alloy rolling process, which belongs to the technical field of colored metal material machining. The method comprises the following steps: (1) according to a position where the temperature is to be measured in a magnesium alloy plate blank, fixing a thermometry galvanic couple in a corresponding position in a plate blank casting mold; (2) casting refined magnesium alloy melt into a split plate blank casting mold so as to make a casting blank into which the thermometry galvanic couple is embedded, taking out the casting blank, and performing homogenization treatment and surface milling to obtain a plate blank to be rolled; (3) putting the plate blank to be rolled into a heating furnace with a roller channel, connecting the thermometry galvanic couple with a temperature data recorder outside the heating furnace, connecting the temperature data recorder with a temperature data analysis system, detecting and storing the temperature change of the plate blank to be rolled at real time in rolling, so as to obtain a temperature-time curve. By adopting the method, the effect of rapid and accurate temperature measurement is achieved, the change route of the temperature of a blank material in high-speed deformation is easy to capture, the experiment operation is simplified, and the influence of manual operation is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal material processing, and in particular relates to a method for measuring temperature changes in the rolling process of magnesium alloys. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, and is an important lightweight structural material. Its products are widely used in aerospace, automotive and military industries. Magnesium alloy rolling is the most important production method for magnesium alloy forming. However, since the crystal structure of the magnesium alloy is a close-packed hexagonal structure, the plastic deformation ability is poor, so the plastic deformation of the magnesium alloy generally needs to be heated to above 250°C for thermal deformation. [0003] Magnesium alloy sheet rolling, no matter in billet rolling or thin plate finish rolling, not only hot rolling, but also heating of the rolls is required ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B38/00B21B37/74
Inventor 乐启炽丁云鹏张志强曹婧崔建忠
Owner NORTHEASTERN UNIV
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