CN101982260A - Beraloy reho-forming method - Google Patents
Beraloy reho-forming method Download PDFInfo
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- CN101982260A CN101982260A CN 201010510451 CN201010510451A CN101982260A CN 101982260 A CN101982260 A CN 101982260A CN 201010510451 CN201010510451 CN 201010510451 CN 201010510451 A CN201010510451 A CN 201010510451A CN 101982260 A CN101982260 A CN 101982260A
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Abstract
The invention relates to a beraloy reho-forming method which is characterized by comprising the following steps: (1) melting beraloy at high temperature, adding deoxidizer and refining agent to refine the beralogy, cooling the molten beralogy to the pouring temperature of 1000-1200 DEG C, and keeping the temperature for 10-20 minutes; (2) preheating a rotary pouring tube to 800-1000 DEG C, controlling the rotation speed of the rotary pouring tube at 30-160 r/min and the inclination angle at 6-30 degrees, and pouring the molten beralogy into the rotary pouring tube through a guide tube; and (3) after the molten beraloy enters a crystallizer which is preheated to 800-1100 DEG C through the rotary pouring tube, controlling the temperature of the crystallizer, and promoting the primary phase to grow in a subsphaeroidal shape by slow cooling and thermal insulation. The invention has the advantages of short technical process, low energy consumption, high efficiency, simple equipment, compact structure and strong adaptability, is especially suitable for small-size die casting enterprises in China, and is applicable to beryllium bronze and copper-calcium alloys.
Description
Technical field
The present invention relates to a kind of method for preparing nearly spherocrystal copper alloy semi solid slurry, belong to semi-solid alloy manufacturing process technical field.
Background technology
Beryllium-bronze is a kind of non-ferrous alloy elastomeric material of high comprehensive performance, is a kind of malleable and castable alloy, is mainly used to make various high-grade elastic elements and electronic component.Beraloy belongs to the acid bronze alloy of timeliness precipitation strength, after handling, quench aging has high intensity, hardness, elastic limit, and good stability, have anti-corrosion, wear-resisting, endurance, low temperature resistant, nonmagnetic, electrical and thermal conductivity is good, can not produce series of advantages such as spark when impacting, and is described as " king of coloured elastomeric material ".Beryllium-bronze material is divided into high-strength high elasticity beraloy (containing the beryllium amount is 1.6%～2.1%) and high conduction beraloy (containing the beryllium amount is 0.2%～0.7%) basically; Be divided into processing alloy and casting alloy by the formed product mode.In recent years, the beraloy range of application is progressively enlarging, be widely used in multiple fields such as electronic apparatus, communication Instrument, Aero-Space, petrochemical industry, metallurgical mine, vehicle appliance, machine-building, become the essential industry material that does not lack in the development of the national economy.
Semi-solid-state shaping or semi-solid processing are a kind of material forming technology that the solidliquid mixture that will contain non-dendrite solid phase shapes in solidification temperature range.Since the seventies in 20th century, many in the world countries invest in succession semi-solid state forming technique and have carried out a large amount of research work, and many achievements have been applied to suitability for industrialized production.1990-2006, successively held 9 alloys and composite material semi-solid state shaping international conference (InternationalConference on semi-solid processing of Alloys and Composites), indicated that semi-solid state forming technique has caused the extensive attention of world industry circle.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.Through 30 years of development, semi-solid state forming technique has experienced from the rheological molding to the thixotropic forming develop in spirals course to rheological molding again.Though thixotropic forming has been obtained successful Application in industrial production, but find that through for many years production practices and further investigation there are three big industrial defectives in thixotropic forming: first, traditional electromagnetic agitation power is big, efficient is low, energy consumption is high, equipment investment is big, additionally exceed about 40% expense during the preparation semi-solid blank, and the composition (microsegregation) of the semi-solid blank of electromagnetic agitation preparation and microstructure inhomogeneous (grain shape and crystal grain distribute); The second, the energy consumption height of remelting heating semi-solid-state blank, the blank surface oxidation is serious, and the loss metal accounts for the 5-12% of billet weight; The 3rd, running gate system and waste product can not reclaim at once, must return the factory that blank prepares workshop or blank supplier, have increased production cost, meet difficulty during the shaping complex parts, and control task is heavy in the production process.In order to address the above problem, further reduce production costs, in recent years, semi-solid state forming technique leading nation with the rheological molding technology as the main direction that reduces cost, flow process is short, material unaccounted-for (MUF) is few, low energy because of this technology has, easily accepted, be considered to have more prospects for commercial application by middle-size and small-size factory.
Summary of the invention
The purpose of this invention is to provide a kind of slow-speed of revolution pipe and carry the method for the nearly spherocrystal beryllium-bronze semi solid slurry of preparation, it is a kind of efficient, high-quality and rheological molding method cheaply.
The present invention is that following technical scheme realizes.
1, melting, refining alloy melt: with the beraloy high temperature melting, add refinings such as deoxidier, refining agent, the beraloy melt is cooled to pouring temperature 1000-1200 ℃ then, insulation 10-20min;
2, the rotary casting stage: earlier the rotary casting pipe is preheated to 800-1000 ℃, it is 30-160r/min that the gate spool rotating speed is changeed in control, rotary casting pipe inclination angle is 6-30 °, above-mentioned beraloy melt is poured into the rotary casting pipe by guide pipe, the beraloy melt-flow is through the rotary casting pipe, under rotary casting pipe chilling and stirring action, nuclear and free takes place to swash in the beraloy melt.
3, the control grain growth stage: earlier crystallizer is preheated to 800-1100 ℃, the beraloy melt enters crystallizer through the rotary casting pipe, and the crystallization control actuator temperature by slow cooling be incubated two links, impels primary phase to be subsphaeroidal growth.
Whole process of preparation is to finish in the environment of a complete closed, can effectively prevent the oxidation of alloy melt.
The invention has the beneficial effects as follows: the blank preparation technics flow process is short, energy consumption is low, efficient is high, equipment is simple, compact conformation, applicability are strong, is particularly suitable for China middle-size and small-size die casting enterprise; Be suitable for beryllium-bronze and copper calcium alloy.
Description of drawings
The slurry microgram that Fig. 1 is obtained for the embodiment of the invention 1.
The slurry microgram that Fig. 2 is obtained for the embodiment of the invention 2.
The specific embodiment
The present invention is further illustrated below in conjunction with embodiment.
The material of embodiment of the present invention is a beryllium-bronze, and its chemical composition (mass fraction %) is: Be:0.2～0.4, and Ni:0.6, surplus is Cu.
Embodiment 1.
The specific embodiment of present embodiment is as follows:
1) beraloy is frequently carried out 1350 ℃ of high temperature melting in the stove in a vacuum, and refining half an hour;
Afterwards the beraloy melt is cooled to 1200 ℃ of pouring temperatures, is incubated 10min, make the temperature and the chemical composition homogenising of beraloy melt.
2) rotary casting.After the beraloy melt reaches technological requirement, pour into rotating duct by guide pipe.Rotating duct control parameter is: material is a stainless steel tube, and preheat temperature is 900 ℃, and rotating speed is 30r/min, and rotary casting pipe inclination angle is 6 °.The start-up temperature control system makes the temperature of carrier pipe inwall remain on 900 ℃ ± 10 ℃.
3) the beraloy melt flows into crystal growing furnace.
Under above-mentioned technology, the index that reaches is:
A, equipment are working properly, about 1min of rotary casting technological process time spent;
The cooling path basically identical of the middle part of B, crystal growing furnace, top and bottom, temperature deviation is little;
The accuracy of temperature control of C, each process procedure is ± 10 ℃
The slurry microstructure that Fig. 1 obtains for present embodiment, primary phase is subsphaeroidal and is evenly distributed, and is desirable microstructure of semisolid.
Embodiment 2.
1) beraloy is frequently carried out 1350 ℃ of high temperature melting in the stove in a vacuum, and refining half an hour;
Afterwards the beraloy melt is cooled to 1000 ℃ of pouring temperatures, is incubated 10min, make the temperature and the chemical composition homogenising of beraloy melt.
2) rotary casting.After the beraloy melt reaches technological requirement, pour into rotating duct by guide pipe.Rotating duct control parameter is: material is a stainless steel tube, and preheat temperature is 950 ℃, and rotating speed is 160r/min, and rotary casting pipe inclination angle is 30 °.The start-up temperature control system makes the temperature of carrier pipe inwall remain on 950 ℃ ± 10 ℃.
3) the beraloy melt flows into crystal growing furnace.
Under above-mentioned technology, the index that reaches is:
A, equipment are working properly, about 1min of rotary casting technological process time spent;
The cooling path basically identical of the middle part of B, crystal growing furnace, top and bottom, temperature deviation is little;
The accuracy of temperature control of C, each process procedure is ± 10 ℃
The slurry microstructure that Fig. 2 obtains for present embodiment, primary phase is subsphaeroidal and is evenly distributed, and is desirable microstructure of semisolid.
Claims (1)
1. beraloy rheological molding method is characterized in that:
(1) with the beraloy high temperature melting, add deoxidier, refining agent refining, then alloy melt is cooled to pouring temperature 1000-1200 ℃, insulation 10-20min;
(2) earlier the rotary casting pipe is preheated to 800-1000 ℃, it is 30-160r/min that the gate spool rotating speed is changeed in control, and the inclination angle is 6-30 °, and above-mentioned alloy melt is poured into the rotary casting pipe by guide pipe;
(3) the beraloy melt enters through the rotary casting pipe and is preheated to 800-1100 ℃ crystallizer, and the crystallization control actuator temperature by slow cooling be incubated two links, impels primary phase to be subsphaeroidal growth.
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| CN 201010510451 CN101982260A (en) | 2010-10-18 | 2010-10-18 | Beraloy reho-forming method |
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| CN 201010510451 CN101982260A (en) | 2010-10-18 | 2010-10-18 | Beraloy reho-forming method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959572A (en) * | 2015-06-17 | 2015-10-07 | 陈文建 | Forging method of aluminum alloy |
| CN104985125A (en) * | 2015-06-17 | 2015-10-21 | 陈文建 | Forging method for high-speed steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147959A (en) * | 2007-10-22 | 2008-03-26 | 南昌大学 | Method for preparing globular crystal aluminium alloy semi-solid slurry material by low rotary speed transport pipe |
| CN101362198A (en) * | 2008-09-12 | 2009-02-11 | 南昌大学 | Rotary pouring manufacture method of AZ91D magnesium alloy semisolid slurry |
-
2010
- 2010-10-18 CN CN 201010510451 patent/CN101982260A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147959A (en) * | 2007-10-22 | 2008-03-26 | 南昌大学 | Method for preparing globular crystal aluminium alloy semi-solid slurry material by low rotary speed transport pipe |
| CN101362198A (en) * | 2008-09-12 | 2009-02-11 | 南昌大学 | Rotary pouring manufacture method of AZ91D magnesium alloy semisolid slurry |
Non-Patent Citations (1)
| Title |
|---|
| 《中国有色金属学报》 20041231 郭洪民等 转动输送管制浆工艺参数对A356合金半固态组织的影响 2049-2054 1 第14卷, 第12期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959572A (en) * | 2015-06-17 | 2015-10-07 | 陈文建 | Forging method of aluminum alloy |
| CN104985125A (en) * | 2015-06-17 | 2015-10-21 | 陈文建 | Forging method for high-speed steel |
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Application publication date: 20110302 |