Constant-temperature preparation method of semi-solid structural slurry of die-casted aluminum alloy billet

An aluminum alloy and semi-solid technology, which is applied in the field of warm semi-solid tissue slurry preparation, can solve the problems of high energy consumption and expensive production equipment for thixotropic forming slurry, and achieve efficient transformation process and shape, and reduced deformation power Effect

Active Publication Date: 2019-01-04
NORTHWESTERN POLYTECHNICAL UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing an isothermal semi-solid structure slurry of an aluminum alloy die-casting billet, which solves the problem of high energy consumption and expensive production equipment when preparing thixotropic slurry by the strain-induced activation method The problem

Method used

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  • Constant-temperature preparation method of semi-solid structural slurry of die-casted aluminum alloy billet
  • Constant-temperature preparation method of semi-solid structural slurry of die-casted aluminum alloy billet
  • Constant-temperature preparation method of semi-solid structural slurry of die-casted aluminum alloy billet

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Pour aluminum alloy molten metal at a temperature of 730°C to 750°C into the die-casting machine, adjust the first-speed switching position of the die-casting machine to 355mm to 365mm, the first-speed speed to 35cm / s to 45cm / s, and the second-speed switching position to 45mm ~55mm, 2nd speed 85cm / s~95cm / s;

[0032] Adjust the injection pressure of the die-casting machine to 0MPa for pouring and die-casting to obtain an aluminum alloy die-casting ingot;

[0033] Step 2: Place the alloy die-casting ingot in a resistance furnace, and at an isothermal temperature of 605°C to 615°C, select the isothermal time to be 4min to 9min, 9min to 15min, 15min to 20min, 25min to 30min or 58min to 63min to obtain half Solid aluminum alloy paste.

Embodiment 2

[0035] Step 1: Pour aluminum alloy molten metal at a temperature of 730°C to 750°C into the die-casting machine, adjust the first-speed switching position of the die-casting machine to 355mm to 365mm, the first-speed speed to 35cm / s to 45cm / s, and the second-speed switching position to 45mm ~55mm, 2nd speed 85cm / s~95cm / s;

[0036] Adjust the injection pressure of the die-casting machine to 8-10MPa for pouring and die-casting to obtain an aluminum alloy die-casting ingot;

[0037] Step 2: Place the alloy die-casting ingot in a resistance furnace, and at an isothermal temperature of 605°C to 615°C, select the isothermal time to be 4min to 9min, 9min to 15min, 15min to 20min, 25min to 30min or 58min to 63min to obtain half Solid aluminum alloy paste.

Embodiment 3

[0039] Step 1: Pour aluminum alloy molten metal at a temperature of 730°C to 750°C into the die-casting machine, adjust the first-speed switching position of the die-casting machine to 355mm to 365mm, the first-speed speed to 35cm / s to 45cm / s, and the second-speed switching position to 45mm ~55mm, 2nd speed 85cm / s~95cm / s;

[0040] Adjust the injection pressure of the die-casting machine to 10-13 MPa for pouring and die-casting to obtain an aluminum alloy die-casting ingot;

[0041] Step 2: Place the alloy die-casting ingot in a resistance furnace, and at an isothermal temperature of 605°C to 615°C, select the isothermal time to be 4min to 9min, 9min to 15min, 15min to 20min, 25min to 30min or 58min to 63min to obtain half Solid aluminum alloy paste.

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Abstract

The invention relates to a constant-temperature preparation method of semi-solid structural slurry of a die-casted aluminum alloy billet. The method is characterized in that an alloy billet is pre-formed by a die-casting method, so that a dendritic structure can be effectively broken, and a primary phase with fine grain size is obtained, and meanwhile, certain distortion energy is reserved in thestructure; then the die-casted aluminum alloy billet is heated to reach a solid-liquid two-phase area and is subjected to constant-temperature semi-solid heat treatment; the constant-temperature heattreatment time and the heat maintaining time are adjusted, and thus the ideal semi-solid slurry can be obtained; the die-casting process is adjusted, and the structure evolution parameters in the following constant-temperature semi-solid heat treatment process of the alloy billet are changed, and thus the die-casted billet raw material for preparing the expected semi-solid alloy slurry can be obtained; and then the die-casted alloy billet is heated to reach the solid-liquid two-phase area and is subjected to constant-temperature semi-solid heat treatment, and the constant-temperature heat treatment and the heat maintaining time can be adjusted, and thus the ideal semi-solid slurry can be obtained.

Description

technical field [0001] The invention belongs to a method for preparing a semi-solid slurry, and relates to a method for preparing an isothermal semi-solid structure slurry of an aluminum alloy die-casting ingot. Background technique [0002] The document ""A method for preparing semi-solid slurry with high solid phase fraction of deformed aluminum alloy applied to semi-solid thixotropic deformation", CN 107012415 A[P].2017." discloses the preparation of a semi-solid slurry In the method, first, the deformed aluminum alloy is hot-extruded above the recrystallization temperature into a bar or hot-rolled into a plate; the deformed aluminum alloy after thermal deformation is naturally cooled to room temperature; and then the deformed aluminum alloy at room temperature is quantitatively Segmentation to obtain the billet; finally, the billet is subjected to semi-solid treatment using a resistance furnace to obtain a semi-solid slurry. This method requires large deformation power,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00C22C21/02C22C21/06C22F1/05C22F1/047
CPCB22D17/007C22C21/02C22C21/06C22F1/047C22F1/05
Inventor 杨光昱欧阳淑霞刘洋赵明介万奇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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