CN101362198A - Rotary pouring manufacture method of AZ91D magnesium alloy semisolid slurry - Google Patents
Rotary pouring manufacture method of AZ91D magnesium alloy semisolid slurry Download PDFInfo
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- CN101362198A CN101362198A CNA2008101070932A CN200810107093A CN101362198A CN 101362198 A CN101362198 A CN 101362198A CN A2008101070932 A CNA2008101070932 A CN A2008101070932A CN 200810107093 A CN200810107093 A CN 200810107093A CN 101362198 A CN101362198 A CN 101362198A
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Abstract
The invention relates to a method for preparing AZ91D magnesium alloy semi-solid sizing agent by rotating pouring, which is characterized in that AZ91D magnesium alloy is melted and refined in a smelting maintaining furnace, then cooled to 630-650 DEG C, and insulated for 10-30 minutes; a stainless steel rotating pouring tube is preheated to 60-80 DEG C, with the rotating speed of the pouring tube controlled at 0-105r/min, and the inclination of the rotating pouring tube being 20-30 degrees; then the AZ91D magnesium alloy melt is poured into the rotating tube through a deflection tube; a crystallizer is preheated to 470-500 DEG C; the AZ91D magnesium alloy melt enters the crystallizer through the rotating pouring tube, and insulated for 5-15 minutes. The method for preparing the AZ91D magnesium alloy semi-solid sizing agent by rotating pouring has a simple device, low cost, convenient operation, high practicality; the prepared AZ91D magnesium alloy semi-solid sizing agent has fine grain organization and even distribution; in addition, the process flow is short, the energy consumption is low, the efficiency is high, the equipment is simple, the structure is compact, the applicability is high, and the method is especially applicable to small and medium-sized enterprises of China.
Description
Technical field
The invention belongs to the metal material moulding technical field, relate to the preparation method of magnesium alloy semisolid slurry.
Background technology
As light metal, specific strength, specific stiffness, magnesium alloy is only second to titanium alloy and structural alloy steel, not only is higher than engineering material far away, and apparently higher than aluminium alloy, its shock resistance, processing characteristics, recyclable performance all are better than aluminium alloy.Just because of these good characteristics of magnesium, magnesium and alloy thereof have been widely used in fields such as Aeronautics and Astronautics, navigation, communication, traffic, sound equipment imaging equipment, microelectric technique in recent years.The casting thin-wall performance of the excellence that magnesium alloy had and good specific strength, specific stiffness and impact resistance can fully satisfy computer, communication, consumer electronics product Highgrade integration, change thinning, microminiaturization, resist and fall requirements such as hitting electromagnetic shielding, heat radiation and environmental protection.Current in industries such as mobile phone, notebook computers, also started research and development of magnesium alloy case and parts and the upsurge of using.Study Mg alloy formed technology, the production of development China magnesium alloy parts is one of current important problem of China.
Semi-solid state forming technique is acknowledged as 21 century the most promising light-alloy near-net-shape technology, comprises two shaping routes of thixotropic forming and rheological molding.In recent years, semi-solid state forming technique develops rapidly at home, but mainly concentrate on semi-solid die casting, report about the system research work of semi-solid rheological molding has the Kang Yonglin scholar of University of Science ﹠ Technology, Beijing to utilize the detrusion principle to develop a kind of low-melting alloy semi solid slurry rheological molding technology; Cui of Northeastern University builds medium scholar and has systematically studied the liquidus curve casting technique, this technology is used to prepare magnesium alloy semisolid slurry at present.
In a word, the method a lot (Semi-Solid Metals Forming technology [M], Mao Weimin, China Machine Press, 2004 editions) for preparing semi solid slurry.As mechanical mixing method, electromagnetic stirring method, ultrasonic vibration method, distortion mutagenesis activation method and spray deposition or the like.And every kind of method all has its shortcoming separately, the production efficiency of traditional mechanical mixing method is low, and teeter chamber and stirring rod life-span are short, and stirring rod and teeter chamber easily pollute semi-solid alloy slurry, only be suitable for breadboard research work, can't satisfy the needs of commodity production; Electromagnetic stirring method it is generally acknowledged to prepare the semi solid slurry of diameter below 150mm, and energy consumption is big owing to there be " kelvin effect "; The decay severity of the ultrasonic vibration ripple of ultrasonic vibration method, ultrasonic wave can not arrive zone darker or far away; Distortion mutagenesis activation method needs very big extrusion deformation degree, so can only prepare the alloy semi-solid blank of minor diameter; The semi-solid blank of spray deposition preparation costs an arm and a leg, and only is suitable for preparing senior or the refractory alloy blank and the senior part blank that is shaped, still can not large-scale application.
People such as the Yang Xiang outstanding person of University Of Nanchang have proposed the (research of inclined tube method rheology pulping equipment technological parameter of inclined tube method rheology pulping process in 2003, Cai Weihua, Yang Xiangjie etc., " University Of Nanchang's journal " industry science version the 25th volume the 3rd phase 13-17 page or leaf), and in thereafter several years, more deep research has been done in rheological molding aluminium alloy semi-solid slurry preparation, and (rotating duct prepares semisolid ZL101 alloy pulp to have proposed the preparation method of rotary casting aluminium alloy semi-solid slurry, Hu Bin, Guo Hongmin, Yang Xiangjie, " Special Processes of Metal Castings and non-ferrous alloy ", 2005 the 25th the 2nd phases of volume, the 103-105 page or leaf).
Summary of the invention
The object of the invention is to provide a kind of employing rotary casting to prepare AZ91D magnesium alloy semisolid slurry method.
Preparation method of the present invention is as follows:
(1) melting, refining AZ91D magnesium alloy fused mass: the AZ91D magnesium alloy is melted in melting ﹠ holding furnace, refining AZ91D magnesium alloy fused mass, the AZ91D magnesium alloy fused mass is cooled to pouring temperature 630-650 ℃ then, be incubated 10-30min, make the temperature and the chemical composition homogenising of AZ91D magnesium alloy fused mass.
The temperature retention time that the AZ91D magnesium alloy fused mass is cooled to after the pouring temperature is preferably 15-20min.
(2) rotary casting: earlier stainless steel rotary casting pipe is preheated to temperature 60-80 ℃, control gate spool rotating speed is Or/min-105r/min, and rotary casting pipe inclination angle is the 20-30 degree, and above-mentioned AZ91D magnesium alloy fused mass is poured into the rotary casting pipe by guide pipe.
(3) the control grain growth stage: earlier crystallizer is preheated to temperature 470-500 ℃, the AZ91D magnesium alloy fused mass enters crystallizer through the rotary casting pipe, through slowly cooling off and being incubated two links, impels the primary phase growth.The temperature retention time of melt is 5-15min in the crystallizer.
In this process, take corresponding effective measures to prevent magnesium alloy from oxidative combustion.In the environment of whole sealing, charge into argon gas and protect magnesium alloy fused mass, implement to isolate, prevent burning.
The AZ91D magnesium alloy semisolid slurry that preparation method of the present invention prepares, its grain structure is tiny, and average crystal grain diameter is 40-50 μ m, the crystal grain distribution uniform.
Preparation method's blank preparation technics flow process of the present invention is short, energy consumption is low, efficient is high, equipment is simple, compact conformation, applicability are strong, is particularly suitable for China medium-sized and small enterprises;
The good magnesium alloy semisolid slurry of preparation method's processability of the present invention does not burn in the casting process, and its device is simple, with low cost, easy to operate, practical.
Description of drawings
Fig. 1 is the prepared AZ91D magnesium alloy semisolid slurry organization chart of the embodiment of the invention 1 described technical process.
Fig. 2 is the prepared AZ91D magnesium alloy semisolid slurry organization charts of the embodiment of the invention 2 described technical process.
Fig. 3 is the prepared AZ91D magnesium alloy semisolid slurry organization charts of the embodiment of the invention 3 described technical process.
Fig. 4 is the prepared AZ91D magnesium alloy semisolid slurry organization charts of the embodiment of the invention 4 described technical process.
The specific embodiment
Embodiment 1.
The present invention is the blank preparation technics of AZ91D magnesium alloy, and the chemical composition of this alloy (mass fraction %) is: Al-8.920, and Zn-0.617, Mn-0.208, Si-0.023, Fe-0.002, Cu-0.001, Be-0.001, Ni-0.001, all the other are Mg.The liquidus temperature of this alloy is 595 ℃, and solidus temperature is 470 ℃.Specific embodiment is as follows:
(1) the AZ91D magnesium alloy is carried out 710 ℃ of high temperature melting in smelting furnace, and concise 1h; Afterwards the AZ91D magnesium alloy fused mass is cooled to 630 ℃ of pouring temperatures, is incubated 15min, make the temperature and the chemical composition homogenising of AZ91D magnesium alloy fused mass.
(2) rotary casting: the preheat temperature with the rotary casting pipe is 60 ℃ earlier, and rotary casting pipe rotating speed is 0r/min, and rotary casting pipe inclination angle is 25 degree, and above-mentioned AZ91D magnesium alloy fused mass is poured into the rotary casting pipe by guide pipe.
(3) crystallizer is preheated to 470 ℃ of temperature, the AZ91D magnesium alloy fused mass flows into crystal growing furnace, insulation 8min.
Embodiment 2.
Embodiment 1 described magnesium alloy.
(1) the AZ91D magnesium alloy is carried out 710 ℃ of high temperature melting in smelting furnace, and concise 1h; Afterwards the AZ91D magnesium alloy fused mass is cooled to 630 ℃ of pouring temperatures, is incubated 15min, make the temperature and the chemical composition homogenising of AZ91D magnesium alloy fused mass.
(2) rotary casting: the preheat temperature with the rotary casting pipe is 60 ℃ earlier, and rotary casting pipe rotating speed is 75r/min, and rotary casting pipe inclination angle 30 degree pour into the rotary casting pipe with above-mentioned AZ91D magnesium alloy fused mass by guide pipe.
(3) crystallizer is preheated to 475 ℃ of temperature, the AZ91D magnesium alloy fused mass flows into crystal growing furnace, insulation 8min.
Embodiment 3.
Embodiment 1 described magnesium alloy.
(1) the AZ91D magnesium alloy is carried out 710 ℃ of high temperature melting in smelting furnace, and concise 1h; Afterwards the AZ91D magnesium alloy fused mass is cooled to 635 ℃ of pouring temperatures, is incubated 15min, make the temperature and the chemical composition homogenising of AZ91D magnesium alloy fused mass.
(2) rotary casting: the preheat temperature with the rotary casting pipe is 60 ℃ earlier, and rotary casting pipe rotating speed is 45r/min, and rotary casting pipe inclination angle 20 degree pour into the rotary casting pipe with above-mentioned alloy melt by guide pipe.
(3) crystallizer is preheated to 480 ℃ of temperature, the AZ91D magnesium alloy fused mass flows into crystal growing furnace, insulation 6min.Embodiment 4.
Embodiment 1 described magnesium alloy.
(1) the AZ91D magnesium alloy is carried out 710 ℃ of high temperature melting in smelting furnace, and concise 1h; Afterwards the AZ91D magnesium alloy fused mass is cooled to 635 ℃ of pouring temperatures, is incubated 15min, make the temperature and the chemical composition homogenising of AZ91D magnesium alloy fused mass.
(2) rotary casting: the preheat temperature with the rotary casting pipe is 60 ℃ earlier, and rotary casting pipe rotating speed is 75r/min, and rotary casting pipe inclination angle is 23 degree, and above-mentioned AZ91D magnesium alloy fused mass is poured into the rotary casting pipe by guide pipe.
(3) crystallizer is preheated to 500 ℃ of temperature, the AZ91D magnesium alloy fused mass flows into crystal growing furnace, insulation 6min.
Claims (2)
1, a kind of rotary casting prepares the method for AZ91D magnesium alloy semisolid slurry, it is characterized in that with the AZ91D magnesium alloy in melting ﹠ holding furnace, melt, refining, be cooled to 630-650 ℃ then, the insulation 10-30min; Stainless steel rotary casting pipe is preheated to 60-80 ℃, and control gate spool rotating speed is 0r/min-105r/min, and rotary casting pipe inclination angle is the 20-30 degree, again the AZ91D magnesium alloy fused mass is poured into the rotary casting pipe by guide pipe; Crystallizer is preheated to 470-500 ℃, and the AZ91D magnesium alloy fused mass enters crystallizer through the rotary casting pipe, insulation 5-15min.
2, method according to claim 1 is characterized in that the temperature retention time that the AZ91D magnesium alloy fused mass is cooled to after the pouring temperature is 15-20min.
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| CNA2008101070932A CN101362198A (en) | 2008-09-12 | 2008-09-12 | Rotary pouring manufacture method of AZ91D magnesium alloy semisolid slurry |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921923A (en) * | 2010-09-07 | 2010-12-22 | 南昌大学 | Method for preparing semi-solid slurry of Cu-Ca alloy |
| CN101982260A (en) * | 2010-10-18 | 2011-03-02 | 南昌大学 | Beraloy reho-forming method |
| CN103381471A (en) * | 2013-07-30 | 2013-11-06 | 上海交通大学 | Preparation method for near-eutectic aluminium-silicon alloy semisolid slurry or blanks |
| CN104233025A (en) * | 2014-05-22 | 2014-12-24 | 华东交通大学 | Preparation method of Mg-9Al-1Zn-xCe alloy semisolid-state blank |
-
2008
- 2008-09-12 CN CNA2008101070932A patent/CN101362198A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101921923A (en) * | 2010-09-07 | 2010-12-22 | 南昌大学 | Method for preparing semi-solid slurry of Cu-Ca alloy |
| CN101982260A (en) * | 2010-10-18 | 2011-03-02 | 南昌大学 | Beraloy reho-forming method |
| CN103381471A (en) * | 2013-07-30 | 2013-11-06 | 上海交通大学 | Preparation method for near-eutectic aluminium-silicon alloy semisolid slurry or blanks |
| CN104233025A (en) * | 2014-05-22 | 2014-12-24 | 华东交通大学 | Preparation method of Mg-9Al-1Zn-xCe alloy semisolid-state blank |
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