Method for regulating and controlling structure uniformity of cross section of ultra-wide aluminum alloy sheet

A technology for aluminum alloy sheet and uniform structure, applied in the field of aluminum alloy sheet processing, can solve the problem of increasing the difficulty of casting and rolling production of high-quality ultra-wide aluminum alloy sheet, uneven structure of aluminum alloy sheet cross-section, and uneven temperature field distribution and other problems, to achieve the effect of fine grains, uniform distribution of the second phase, and uniform temperature field

Active Publication Date: 2019-05-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the temperature difference caused by the difference of radiation and heat dissipation to the external environment during the process of filling the nozzle by the melt affects the unevenness of the cross-sectional structure of the aluminum alloy sheet, it is necessary to study a method to control the uniformity of the cross-sectional structure of the ultra-wide aluminum alloy sheet. method, the temperature field of the melt inside the nozzle along the width direction can be achieved uniformity through a temperature segmental control device
[0005] To sum up, the problem existing in the prior art is: the inhomogeneity of the melt temperature field along the width direction inside the casting nozzle in the prior art leads to the inhomogeneity of the cross-sectional structure of the aluminum alloy plate, which leads to how to effectively The technical problem of controlling the cross-sectional temperature field of molten aluminum inside the casting nozzle
[0007] Difficulty: Because the melt of the single narrow inlet nozzle flows into the nozzle through the small runner connected to the front box and the nozzle, and then drives the melt to flow to both sides through the diverter block, resulting in the melt at the tail of the nozzle along the width direction. There is a phenomenon that the body temperature gradually decreases from the middle to the edge, and as the width of the nozzle increases, the temperature difference between the melt in the middle and the edge of the nozzle increases, which makes the temperature of the melt at the outlet of the nozzle along the width direction of the nozzle The more serious the inhomogeneity of the field distribution, the more difficult it is to produce high-quality ultra-wide aluminum alloy sheet casting and rolling

Method used

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  • Method for regulating and controlling structure uniformity of cross section of ultra-wide aluminum alloy sheet
  • Method for regulating and controlling structure uniformity of cross section of ultra-wide aluminum alloy sheet
  • Method for regulating and controlling structure uniformity of cross section of ultra-wide aluminum alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Step 1: Preparation of raw materials for production: select 1060A aluminum alloy, make ingredients according to the designated grade, and use solid aluminum ingots with high purity. The percentages of Fe and Si are required to be controlled at 0.4-0.55 and 0.2-0.4 respectively;

[0083] Step 2: Melting: Add solid aluminum ingots and heat up. When the temperature reaches above 710°C, add alloy additives evenly according to the designated brand; after standing for 25-35 minutes, carry out electromagnetic stirring for 15-25 minutes; when the aluminum ingots are completely melted, carry out Electromagnetic stirring twice, stirring once every 15-35 minutes, 15-25 minutes each time; when the temperature of the molten aluminum in the furnace reaches 730°C-750°C, carry out the first argon powder spraying refining, tetrachloride The amount of carbon used is 2-3kg / ton of aluminum, and the refining time is 20-35 minutes. During refining, the wave height of the melt is controlled to...

Embodiment 2

[0092] Such as figure 2 and image 3 As shown, as a further improvement to Embodiment 1, in this embodiment, one more step should be added after Step 7 of Embodiment 1, that is, the temperature control of the melt inside the nozzle.

[0093] The specific steps are as follows: firstly, install and fix the serial thermal sensor 9 and the heating element 10 at the tail of the casting nozzle 13 sequentially and evenly, and then connect the terminals of the thermal sensor and the heating element to the terminals of the PLC temperature control system 11 Connect, and finally turn on the power supply 12 circuits, wherein the number of heating element terminals is required to be the same as that of the thermal sensor and the number of heating elements, then start the power supply of the temperature control device, and set the temperature control parameters of the PLC temperature control system to 683°C. And select the working voltage and power of the heating element, so that the temp...

Embodiment 3

[0100] In order to conduct a comparative analysis of temperature control parameters with Example 2, in this example, the temperature control parameters of the PLC temperature control system were set to 685° C. and 688° C. respectively. The specific comparison of the lateral temperature field distribution inside the nozzle in the test can be shown in Table 2:

[0101] Table 2 The specific comparison of the distribution of the lateral temperature field inside the nozzle

[0102]

[0103] result:

[0104] In fact, for the temperature control parameters of the PLC temperature control system, the test results show that the transverse temperature field inside the casting nozzle is generally distributed around 685°C, and 685°C presents the main trend. Therefore, while setting the temperature control parameters of the PLC temperature control system to 680-690°C, 685°C is preferred.

[0105] The alloy provided in the embodiment of the present invention is 1060A aluminum alloy.

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Abstract

The invention belongs to the technical field of aluminum alloy sheet machining, and discloses a method for regulating and controlling the structure uniformity of a cross section of an ultra-wide aluminum alloy sheet. The method comprises the following steps: producing ingredients, specifically, 1-series or 3-series aluminum alloy is selected and blending is performed according to a specified grade; performing smelting; performing a converter operation when the temperature of a molten aluminum melt reaches 730 to 740 DEG C; performing standing treatment; performing dehydrogenizing treatment; performing filtering by adopting two stages of ceramic filtering plates, namely, 30PPI and 50PPI, specifically, the temperature of a filtering box is controlled at 720+ / -5 DEG C; performing grain refining treatment; and regulating and controlling the temperature of the melt in a casting nozzle. According to the method for regulating and controlling the uniformity of the cross section structure of the ultra-wide aluminum alloy sheet, by introducing a temperature regulating and controlling device at the tail part of the casting nozzle and regulating and controlling the temperature automatically, the temperature field uniformity of the ultra-wide aluminum alloy sheet in the direction of the width of the casting nozzle in a casting-rolling process can be ensured; a uniform plate blank cross section structure is obtained; a 3-mm aluminum alloy sheet with uniform structure components, fine grain size and uniform second phase distribution is produced; and the casting-rolling of a high-quality ultra-wide aluminum alloy sheet is achieved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy plate processing, and in particular relates to a method for regulating the uniformity of the cross-sectional structure of an ultra-wide aluminum alloy plate. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] For the casting and rolling production method of ultra-wide aluminum alloy sheets, the nozzle structures currently used in industry can be roughly divided into two basic structures: multi-entry wide-entry nozzles and single narrow-entry nozzles. Because the single narrow-entrance nozzle has better thermal insulation performance, more controllable temperature, and is less likely to form an oxide film with air to reduce the inclusion defects of the strip, so the single narrow-entry nozzle is mostly used in industrial production. However, for a single narrow-entrance nozzle, due to the effect of the diverter block, t...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06C22C21/00B22D11/06B22D11/18
Inventor 黄元春闵旭东任贤魏刘宇肖政兵
Owner CENT SOUTH UNIV
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