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Processing method of high-toughness Al-Si system die-casting aluminum alloy

A technology for casting aluminum alloys and processing methods, which is applied in the processing field of high-toughness Al-Si series die-casting aluminum alloys, can solve problems such as energy waste, cumbersome processes, and large phase volume fractions, and achieve improved mechanical properties, expanded application range, The effect of improving mechanical properties

Active Publication Date: 2013-04-10
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the commonly used heat treatment process is artificial aging after solution treatment, but this process has a short process window for some alloys, especially for the improvement of the eutectic silicon morphology; at the same time, this process requires re-treatment of die-casting workpieces. Heating and heat preservation takes a long time, the process is cumbersome, the energy waste is serious, and it is not good for the size control of the workpiece
The regression reaging heat treatment process developed in recent years is also not conducive to industrial application due to the short regression time of the process (usually only tens of seconds to ten minutes), and because the initial state is T6 state, the volume fraction of grain boundary precipitated phase is relatively low. large, the subsequent coarsening process cannot improve the toughness of the alloy

Method used

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  • Processing method of high-toughness Al-Si system die-casting aluminum alloy
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  • Processing method of high-toughness Al-Si system die-casting aluminum alloy

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preparation example Construction

[0028] The specific preparation process is as follows: firstly, according to the existing die-casting process, the fully treated aluminum alloy melt is die-casted at a certain temperature, the temperature of the die-casting mold is controlled at 350-400 ° C, and the holding time is 1-60 seconds. Then open the mold. After the mold is opened, quickly take it out and put it into the circulating cooling water for quenching. The transfer time is controlled to be less than 5 seconds. The quenching temperature is 350-550°C, the cooling water temperature is lower than 30°C, and the volume ratio of cooling water to workpiece is greater than 5. , removed from the circulating cooling water, and deburred. After deburring, anneal and hold at 50-250°C for 2-3 hours to eliminate the thermal stress generated during the quenching process and improve the toughness and fatigue strength of the workpiece.

[0029] Among them, it is preferable to control the temperature of the die-casting mold at ...

Embodiment 1

[0031] Taking ADC12 alloy die-cast washing machine 7kg triangular support as an example, the chemical composition of ADC12 alloy is Al-balance Si-10.8 Cu-2.5 Mg-0.3 Mn-0.5 Fe-0.9 Zn-1.0 Sn-0.2 Ni-0.5.

[0032] 1) Melting: using natural gas reverberatory furnace for melting, melting temperature is 650℃;

[0033] 2) Melt treatment: Purify, modify, and refine the melted ADC12 alloy melt, and then keep it warm at 630°C. The purification method is adsorption purification by blowing Ar gas, and the compound modifier is used for modification and refinement;

[0034] 3) Die-casting: remove the oxide layer on the surface of the melt-treated ADC12 alloy, and then add it to the die-casting machine. The temperature of the aluminum melt is 630°C, and the mold temperature is 380°C; clock mold;

[0035] 4) Quenching: Take out the workpiece quickly after opening the mold, put it into circulating cooling water with a water temperature lower than 30°C for quenching, the quenching temperature is ...

Embodiment 2

[0045] Taking AlSi12Cu alloy as an example, the chemical composition of the alloy is Al-remainder Si-11 Cu-1.2 Mg-0.4Mn-0.2 Fe-1.2 Zn-0.5 Sn-0.1 Ni-0.2.

[0046] 1) Melting: using natural gas reverberatory furnace for melting, melting temperature is 650℃;

[0047] 2) Melt treatment: Purify, modify, and refine the melted alloy melt, and then keep it warm at 630°C. The purification method is adsorption purification by blowing Ar gas, and the compound modifier is used for modification and refinement;

[0048] 3) Die-casting: After removing the surface oxide layer of the melt-treated alloy, add it to the die-casting machine. The temperature of the aluminum melt is 630°C, and the mold temperature is 350°C; ;

[0049] 4) Quenching: Take out the workpiece quickly after opening the mold, put it into circulating cooling water with a water temperature lower than 30°C for quenching, the quenching temperature is 350°C, and remove the burr of the workpiece after complete cooling;

[0050...

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Abstract

The invention provides a processing method of a high-toughness Al-Si system die-casting aluminum alloy. The method comprises the following steps: carrying out die-casting molding of an Al-Si system aluminum alloy melt, wherein the die casting die temperature is 350-400DEG C and the pressure maintaining time is 1-60s; carrying out die opening, rapidly taking out the obtained object, putting the object in circulating cooling water for quenching, taking out the object from the circulating cooling water after complete cooling, and burring, wherein the time for transferring the object to the circulating cooling water from the die is less than 5s, the quenching temperature is 350-550DEG C and the temperature of the cooling water is less than 30DEG C; and carrying out annealing heat-insulation at 50-250DEG C for 2-3h. The method enables Al-Si system alloy die castings to have the advantages of substantially improved strength and toughness, uniform workpiece structure, excellent mechanical performances, and good safety and reliability, and the application range of the Al-Si system alloy die castings to the enlarged.

Description

technical field [0001] The invention relates to a processing method of high-toughness Al-Si series die-casting aluminum alloy, belonging to the technical field of non-ferrous metal processing. Background technique [0002] Al-Si series alloys have good fluidity, dense castings, and are not easy to produce casting cracks. They have good casting performance, corrosion resistance and moderate cutting performance. They are ideal casting alloys and have become the most valued in the manufacturing industry. One of the structural materials. However, the mechanical properties of cast Al-Si alloys are not satisfactory at present, the strength and hardness are average, and the toughness is low. With the development of modern industry, traditional casting technology and cast Al-Si alloys can no longer meet the growing social needs. Therefore, the development of advanced die-casting technology and high-strength cast Al-Si alloys is the future of aluminum alloys and their manufacturing....

Claims

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Application Information

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IPC IPC(8): C22C21/02B22D18/00B22D17/00B22D21/04C22F1/043
Inventor 李清文李凯陈名海张锐赵永好徐坤元
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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