CN102581257B - Circulating closed die forging method for preparing magnesium alloy semi-solid billet and thixoextrusion forming method - Google Patents
Circulating closed die forging method for preparing magnesium alloy semi-solid billet and thixoextrusion forming method Download PDFInfo
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- CN102581257B CN102581257B CN 201210054785 CN201210054785A CN102581257B CN 102581257 B CN102581257 B CN 102581257B CN 201210054785 CN201210054785 CN 201210054785 CN 201210054785 A CN201210054785 A CN 201210054785A CN 102581257 B CN102581257 B CN 102581257B
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Abstract
The invention discloses a circulating closed die forging method for preparing a magnesium alloy semi-solid billet, a circulating closed die forging die for preparing the magnesium alloy semi-solid billet and a thixoextrusion forming process. The method comprises the steps of performing pre-deformation treatment on a magnesium alloy casting blank by using the circulating closed die forging die, repeatedly performing die forging for two to six times, heating the magnesium alloy casting blank after large deformation to a temperature 2-5 DEG C higher than solidus temperature, and incubating for 5-15min; and transferring re-molten slurry into an extrusion die for extrusion forming. The obtained pretreated billet has a uniform and fine grain, a semi-solid thixoextrusion-formed part has a fine, round and uniform grain, and mechanical performance is improved.
Description
Technical field
The present invention relates to the circulation closed die forging and prepare magnesium alloy semi-solid state blank, blank remelting and thixoextruding manufacturing process belong to the S emi-solid Forming Magnesium Alloys field.
Background technology
Semi-solid Metals Forming Techniques is fit to make high-quality light-alloy part, and production efficiency is high, can reduce solidification shrinkage and the gross segregation of foundry goods, the compactness of Effective Raise foundry goods and mechanical property.Semi-solid-state shaping method mainly comprises rheological molding, injection moulding and thixotropic forming.The semi-solid-state metal thixotropic forming is a kind of semi-solid metal slurry that utilizes the methods such as vigorous stirring to prepare globular crystal, this semi-solid metal slurry further is frozen into ingot blank or blank, again blank is reheated to solid-liquid two-phase region and be sent to the process that former is shaped.Kind according to former is different, and the semi-solid-state metal thixotropic forming is divided into thixotroping die casting, and thixotroping is forged, and thixotroping is rolling, thixoextruding etc.
Magnesium metal and alloy thereof have the advantages such as low-density, high specific strength and high specific stiffness, good damping shock absorption and thermal conductivity, are widely used in the fields such as Aero-Space, weapons, automobile, electronic product.Semi-solid state forming technique can further improve the mechanical property of magnesium alloy, enlarges its range of application.Magnesium alloy semi solid state thixoextruding forming technology is blank preparation → remelting → extruding.Therefore, the preparation process of semi-solid blank or slurry, remelting processing and extrusion process have material impact to tissue and the performance of magnesium alloy semi solid state thixoextruding formed product.
Summary of the invention
The object of the present invention is to provide a kind of magnesium alloy semi-solid state blank preparation and thixoextruding manufacturing process thereof, the mechanical property of the method energy Effective Raise Mg alloy castings.
The technical scheme that realizes the object of the invention is a kind of circulation closed stamp forging mould for preparing magnesium alloy semi-solid state blank, comprise by heat-resisting, the punch that oxidation resistant mould steel is made (1), upper cavity die (2), lower cavity die (3) and impression (4), wherein design of forging die is that level can be divided die, upper cavity die (2) flatly engages and forms the through hole that can hold punch (1) with lower cavity die (3), through hole has the cross section of Wmm * Wmm, punch (1), upper cavity die (2), lower cavity die (3) and the formed mould molding of impression (4) space are of a size of Hmm * Wmm * Wmm, during die forging, in through hole, be placed into the blank that is of a size of Wmm * Wmm * Hmm, under the drive of hydraulic press so that punch (1) by through hole blank is depressed, obtain size and still be the blank of Wmm * Wmm * Hmm, so that the size of the front blank of die forging and the blank after the die forging is measure-alike.
The die forging method of realizing the object of the invention may further comprise the steps:
1. the machining of magnesium strand: industrial attitude magnesium alloy strand is processed into the size corresponding with above-mentioned die internal diameter, the i.e. stock of square of Wmm * Wmm * Hmm;
2. the distortion of blank: to through step 1. the magnesium alloy blank of machining carry out preheating, preheat temperature is 340-360 ℃, the insulation 30-50min; Above-mentioned stamp forging mould is fixed on the workbench of forging press, mould is carried out preheating, preheated blank is put into the die of stamp forging mould, under the drive of hydraulic press, so that the punch of stamp forging mould is depressed blank by through hole, still be the predeformation magnesium alloy blank of Wmm * Wmm * Hmm so that in the molding space of mould, obtain size; Wherein, die forging speed 2mm/s uses MoS in the die forging process
2As lubricant.
3. die forging circulates: take out the magnesium alloy blank that 2. is out of shape through step, be heated to 350 ℃, insulation 6min carries out next time die forging, and die forging speed 2mm/s uses MoS in the die forging process
2As lubricant; Circulation die forging number of times is 2 ~ 6 times;
4. after the circulation die forging is finished, with magnesium alloy blank air cooling to room temperature.
The blank remelting method of realizing the object of the invention is from the sample through circulation closed die forging blank intercepting corresponding size, sample is heated to more than the semi-solid temperature solidus temperature 2 ~ 5 ℃, insulation.It is that extrusion die is preheating to 400 ℃ that thixoextruding is shaped, and the remelting blank is inserted in the extrusion die, and extrusion molding makes part.
The advantage of this method is: prepare magnesium alloy semi-solid state blank by the circulation closed die forging, crystal grain obtains remarkable refinement, and mechanical property is improved; Can reduce the solidification shrinkage of foundry goods, the compactness of Effective Raise part and serviceability.
Description of drawings
Fig. 1 is the stamp forging mould schematic diagram that the present invention prepares magnesium alloy semi-solid state blank;
Fig. 2 is that the present invention prepares magnesium alloy semi-solid state blank die forging process schematic diagram;
Fig. 3 is the grain refining effect figure that produces for 1 time with die forging of the present invention among the embodiment;
Fig. 4 is the grain refining effect figure that produces for 2 times with die forging of the present invention among the embodiment;
Fig. 5 is the grain refining effect figure that produces for 3 times with die forging of the present invention among the embodiment;
Fig. 6 is the grain refining effect figure that produces for 4 times with die forging of the present invention among the embodiment;
Fig. 7 is that the present invention prepares the part that AM60 magnesium alloy semi solid state thixoextruding is shaped;
The specific embodiment
The present invention will be described further by following examples.
Embodiment is the AM60 magnesium alloy under the present invention.
AM60 magnesium alloy casting rod is prepared
The circulation closed stamp forging mould of the preparation magnesium alloy semi-solid state blank of present embodiment is that level can be divided die, comprise by heat-resisting, the punch that oxidation resistant mould steel is made (1), upper cavity die (2), lower cavity die (3) and impression (4), upper cavity die (2) flatly engages and forms the through hole that can hold punch (1) with lower cavity die (3), through hole has the cross section of Wmm * Wmm, punch (1), upper cavity die (2), lower cavity die (3) and the formed mould molding of impression (4) space are of a size of Hmm * Wmm * Wmm, during die forging, in through hole, be placed into the blank that is of a size of Wmm * Wmm * Hmm, under the drive of hydraulic press so that punch (1) by through hole blank is depressed, obtain size and still be the blank of Wmm * Wmm * Hmm, so that the size of the front blank of die forging and the blank after the die forging is measure-alike.
Adopt above-mentioned stamp forging mould to prepare the AM60 magnesium alloy semi-solid state blank: at first industrial attitude AM60 magnesium alloy strand to be processed into the stock of square with the corresponding 80mm * 80mm of above-mentioned die internal diameter * 160mm.Blank through machining is preheated to 350 ℃, insulation 40min; Above-mentioned stamp forging mould is fixed on the workbench of forging press, mould is carried out preheating, preheated blank is put into the die of stamp forging mould, under the drive of hydraulic press, so that the punch of stamp forging mould is depressed blank by through hole, obtain size and still be the predeformation magnesium alloy blank of 80mm * 80mm * 160mm; Die forging speed 2mm/s uses MoS in the die forging process
2As lubricant.Taking-up is heated to 350 ℃ through the magnesium alloy blank of predeformation, and insulation 6min carries out next time die forging, and die forging speed 2mm/s still uses MoS in the die forging process
2As lubricant; Circulation die forging number of times is 1 time, 2 times, 3 times, 4 times.After die forging was finished, air cooling was to room temperature.From be of a size of the sample of f75mm * 35mm through 1 time, 2 times, 3 times, 4 times circulation closed die forging blank interceptings, sample is heated to namely 570 ℃, insulation 5min.Extrusion die is preheating to 400 ℃, and the remelting blank is inserted in the extrusion die, and extrusion molding makes part.The microstructure of semisolid crystallite dimension that obtains through 1 time, 2 times, 3 times, 4 times circulation closed die forgings is respectively 59 μ m, 46 μ m, 36 μ m, 32 μ m.The AM60 magnesium alloy parts mechanical property that repeatedly the semisolid thixoextruding is shaped after the die forging obtains to significantly improve.
Claims (1)
1. circulation closed die forging method for preparing magnesium alloy semi-solid state blank, it is characterized in that: employed stamp forging mould, comprise by heat-resisting, the punch that oxidation resistant mould steel is made (1), upper cavity die (2), lower cavity die (3) and impression (4), wherein design of forging die is that level can be divided die, upper cavity die (2) flatly engages and forms the through hole that can hold punch (1) with lower cavity die (3), through hole has the cross section of Wmm * Wmm, punch (1), upper cavity die (2), the molding space of lower cavity die (3) and the formed mould of impression (4) is of a size of Hmm * Wmm * Wmm; Described die forging method specifically may further comprise the steps:
1. the machining of magnesium strand: industrial attitude magnesium alloy strand is processed into the size corresponding with above-mentioned die internal diameter, the i.e. stock of square of Wmm * Wmm * Hmm;
2. the distortion of blank: to through step 1. the magnesium alloy blank of machining carry out preheating, preheat temperature is 340-360 ℃, the insulation 30-50min; Above-mentioned stamp forging mould is fixed on the workbench of forging press, mould is carried out preheating, preheated blank is put into the die of stamp forging mould, under the drive of hydraulic press, so that the punch of stamp forging mould is depressed blank by through hole, still be the predeformation magnesium alloy blank of Wmm * Wmm * Hmm so that in the molding space of mould, obtain size; Wherein, die forging speed 2mm/s uses MoS2 as lubricant in the die forging process;
3. die forging circulates: take out the magnesium alloy blank that 2. is out of shape through step, be heated to 350 ℃, insulation 6min carries out next time die forging, and die forging speed 2mm/s uses MoS2 as lubricant in the die forging process; Circulation die forging number of times is 2 ~ 6 times;
4. after the circulation die forging is finished, with magnesium alloy blank air cooling to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210054785 CN102581257B (en) | 2012-03-05 | 2012-03-05 | Circulating closed die forging method for preparing magnesium alloy semi-solid billet and thixoextrusion forming method |
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| CN 201210054785 CN102581257B (en) | 2012-03-05 | 2012-03-05 | Circulating closed die forging method for preparing magnesium alloy semi-solid billet and thixoextrusion forming method |
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| CN102581257B true CN102581257B (en) | 2013-10-30 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105344973B (en) * | 2015-11-13 | 2017-05-31 | 燕山大学 | A kind of magnesium alloy semi-solid state blank preparation facilities and method |
| CN105921657B (en) * | 2016-07-15 | 2018-06-29 | 合肥工业大学 | Prepare the two-way upsetting extrusion method of blanking type back pressure of refractory metal super fine crystal material |
| CN105970126B (en) * | 2016-07-20 | 2018-04-27 | 西安理工大学 | A kind of method that Under Pressure Solidification prepares fine grain CuNiMnFe alloys |
| CN106180520A (en) * | 2016-08-13 | 2016-12-07 | 慈溪市丰盈电声配件有限公司 | Closing mould forging mould and a kind of closing mould forging method |
| CN106825496B (en) * | 2016-12-16 | 2018-08-03 | 浙江天雅江涛动力有限公司 | A kind of wrought aluminium alloy workpiece casting forging unification moulding process |
| CN110000322B (en) * | 2019-04-25 | 2021-06-04 | 湖南科技大学 | Device and method for preparing high-performance magnesium alloy through large plastic deformation |
| CN110328315B (en) * | 2019-08-19 | 2021-01-08 | 中北大学 | Uniform upsetting method for non-anisotropic magnesium alloy bar |
| CN113369327B (en) * | 2021-06-11 | 2022-04-12 | 中国兵器工业第五九研究所 | Open cavity circular extrusion process |
| CN113828647B (en) * | 2021-09-02 | 2024-01-30 | 昆明理工大学 | Gradient heating thixotropic extrusion forming method and device for conical nut part |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101116879A (en) * | 2007-09-11 | 2008-02-06 | 华南理工大学 | Equal channels extrusion device |
| CN102198501A (en) * | 2010-12-06 | 2011-09-28 | 南昌大学 | Thixotropic plastic forming method for metal alloy |
| CN202015806U (en) * | 2011-01-16 | 2011-10-26 | 江苏海达管件集团有限公司 | Multi-way centripetal hot extrusion closed composite forging die |
| CN102284664A (en) * | 2011-07-05 | 2011-12-21 | 哈尔滨工业大学 | Semi-solid forming die and forming method for cavity-variable axisymmetric part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006093469A1 (en) * | 2005-03-04 | 2006-09-08 | Agency For Science, Technology And Research | Method and apparatus for forging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101116879A (en) * | 2007-09-11 | 2008-02-06 | 华南理工大学 | Equal channels extrusion device |
| CN102198501A (en) * | 2010-12-06 | 2011-09-28 | 南昌大学 | Thixotropic plastic forming method for metal alloy |
| CN202015806U (en) * | 2011-01-16 | 2011-10-26 | 江苏海达管件集团有限公司 | Multi-way centripetal hot extrusion closed composite forging die |
| CN102284664A (en) * | 2011-07-05 | 2011-12-21 | 哈尔滨工业大学 | Semi-solid forming die and forming method for cavity-variable axisymmetric part |
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