Method for preparing semisolid blank

Abstract

The invention relates to a method for preparing a semisolid blank, utilizes an improved SIMA (strain induced melt activation) method to prepare the semisolid blank, and belongs to the technical field of metal semisolid blank. The method comprises the following steps of: firstly, measuring a liquid solid phase line point of the semisolid alloy to be prepared, then, heating an alloy blank so as to carry out asynchronization multitrack rolling or pillar squeezing transformation, finally, remelting, and carrying out heat preservation for a long time so as to obtain the required semisolid blank. The asynchronization rolling or pillar squeezing transformation is capable of generating large deformation amount, group bough crystal formed in the blank is destroyed, the asynchronization rolling is utilized to replace pre-deformation processes such as the existing upset, compression, equal diameter angle compression, and the semisolid blank is prepared and has the advantages of uniform formation, high nodularity, and accurate control solid phase rate.

Description

technical field

[0001] The invention relates to a method for preparing semi-solid blanks, belonging to the technical field of metal semi-solid blanks. Background technique

[0002] In the 1970s, Professor Flemings of the Massachusetts Institute of Technology and others developed a brand-new metal forming method called semi-solid processing technology. It is a method of forming metals according to their characteristics during the transition from liquid to solid or from solid to liquid (that is, the coexistence of liquid and solid). This new forming method combines the advantages of solidification processing and plastic processing, that is, the processing temperature is lower than that of the liquid state, and the deformation resistance is smaller than that of the solid state. It can form parts with complex shapes and high precision and performance quality requirements with a large amount of deformation at one time. Therefore, Semi-solid processing technology is known as the ...

Examples

Embodiment approach 1

[0023] Embodiment 1: The multi-pass rolling and remelting process of this embodiment prepares CuSn10 tin bronze semi-solid billet preparation method (see figure 1 ):

[0024] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; the alloy in this example is a CuSn10 tin bronze alloy with a size of 25 × 25 × 100mm rectangular material, using differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 850°C, and the liquidus temperature is 1020°C;

[0025] (2) Heat the alloy billet above the recrystallization temperature, and use the rolling process to perform multi-directional alternate rolling of horizontal rolling and longitudinal rolling on the billet; in this example, heat CuSn10 tin bronze to 450 ° C, and then first Roll the billet in one pass along its axial direction with a reduction of 2 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 1.5 mm; then rotate the bille...

Embodiment approach 2

[0027] Embodiment 2: The rolling and remelting process of this embodiment prepares the 5083 aluminum alloy semi-solid billet preparation method:

[0028] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; in this example, the alloy is 5083 aluminum alloy, and the rectangular material with a size of 30×30×150mm is measured by differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 571°C, and the liquidus temperature is 642°C;

[0029](2) Heating the alloy billet above the recrystallization temperature, and using the open billet forging process, the billet is subjected to multi-directional alternate rolling of horizontal rolling and longitudinal rolling; in this embodiment, the 5083 aluminum alloy is heated to 460 ° C, and then First roll the billet one pass along its axial direction with a reduction of 4 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 5 mm; then rot...

Embodiment approach 3

[0031] Embodiment 3: The rolling and remelting process of this embodiment prepares CuSn10 tin bronze semi-solid billet preparation method:

[0032] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; the alloy in this example is a CuSn10 tin bronze alloy with a size of 25 × 25 × 100mm rectangular material, using differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 850°C, and the liquidus temperature is 1020°C;

[0033] (2) Heat the alloy billet above the recrystallization temperature, and use the rolling process to perform multi-directional alternate rolling of horizontal rolling and longitudinal rolling on the billet; in this example, heat CuSn10 tin bronze to 450 ° C, and then first Roll the billet in one pass along its axial direction with a reduction of 1 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 1.5 mm; then rotate the billet along its axial direction ...

technical field

[0001] The invention relates to a method for preparing semi-solid blanks, belonging to the technical field of metal semi-solid blanks. Background technique

[0002] In the 1970s, Professor Flemings of the Massachusetts Institute of Technology and others developed a brand-new metal forming method called semi-solid processing technology. It is a method of forming metals according to their characteristics during the transition from liquid to solid or from solid to liquid (that is, the coexistence of liquid and solid). This new forming method combines the advantages of solidification processing and plastic processing, that is, the processing temperature is lower than that of the liquid state, and the deformation resistance is smaller than that of the solid state. It can form parts with complex shapes and high precision and performance quality requirements with a large amount of deformation at one time. Therefore, Semi-solid processing technology is known as the ...

Examples

Embodiment approach 1

[0023] Embodiment 1: The multi-pass rolling and remelting process of this embodiment prepares CuSn10 tin bronze semi-solid billet preparation method (see figure 1 ):

[0024] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; the alloy in this example is a CuSn10 tin bronze alloy with a size of 25 × 25 × 100mm rectangular material, using differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 850°C, and the liquidus temperature is 1020°C;

[0025] (2) Heat the alloy billet above the recrystallization temperature, and use the rolling process to perform multi-directional alternate rolling of horizontal rolling and longitudinal rolling on the billet; in this example, heat CuSn10 tin bronze to 450 ° C, and then first Roll the billet in one pass along its axial direction with a reduction of 2 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 1.5 mm; then rotate the bille...

Embodiment approach 2

[0027] Embodiment 2: The rolling and remelting process of this embodiment prepares the 5083 aluminum alloy semi-solid billet preparation method:

[0028] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; in this example, the alloy is 5083 aluminum alloy, and the rectangular material with a size of 30×30×150mm is measured by differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 571°C, and the liquidus temperature is 642°C;

[0029](2) Heating the alloy billet above the recrystallization temperature, and using the open billet forging process, the billet is subjected to multi-directional alternate rolling of horizontal rolling and longitudinal rolling; in this embodiment, the 5083 aluminum alloy is heated to 460 ° C, and then First roll the billet one pass along its axial direction with a reduction of 4 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 5 mm; then rot...

Embodiment approach 3

[0031] Embodiment 3: The rolling and remelting process of this embodiment prepares CuSn10 tin bronze semi-solid billet preparation method:

[0032] (1) Measure the liquidus-solidus line point of the semi-solid billet alloy to be prepared; the alloy in this example is a CuSn10 tin bronze alloy with a size of 25 × 25 × 100mm rectangular material, using differential scanning calorimetry (DSC) The measured solidus temperature of the alloy is 850°C, and the liquidus temperature is 1020°C;

[0033] (2) Heat the alloy billet above the recrystallization temperature, and use the rolling process to perform multi-directional alternate rolling of horizontal rolling and longitudinal rolling on the billet; in this example, heat CuSn10 tin bronze to 450 ° C, and then first Roll the billet in one pass along its axial direction with a reduction of 1 mm; then rotate the billet 90° along its axial direction and roll it with a reduction of 1.5 mm; then rotate the billet along its axial direction ...

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