CN108359870B - The high energy-absorbing magnesium alloy of middle plasticity and can depth clod wash tubing preparation facilities and method - Google Patents
The high energy-absorbing magnesium alloy of middle plasticity and can depth clod wash tubing preparation facilities and method Download PDFInfo
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- CN108359870B CN108359870B CN201810331020.5A CN201810331020A CN108359870B CN 108359870 B CN108359870 B CN 108359870B CN 201810331020 A CN201810331020 A CN 201810331020A CN 108359870 B CN108359870 B CN 108359870B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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Abstract
A kind of high energy-absorbing magnesium alloy of middle plasticity and can depth clod wash tubing preparation facilities and method, belong to metal material technology and metallurgical technology field；The magnesium alloy ingredient is respectively as follows: Zn:1.5~2.2%, Ce:0.2~0.7%, La:0.1~0.2% by mass percentage, and Mn:0.3~0.9%, Zr:0.06~0.6%, Ca:0.1~0.3%, surplus is Mg and impurity.Wherein, by mass percentage, (2~7) Ce: La=: (1.5~5) 1, Mn: Zr=: 1, impurity F e < 0.003%；The device includes hollow pressure ram, Splicing Mechanism upper mold, Splicing Mechanism lower die, extrusion cylinder, extruding pad and turbocharging cooling system；Magnesium alloy pipe preparation method: 1) carrying out melting for raw material, carries out purified treatment to melt；2) melt is cooled to 680~700 DEG C of progress semi-continuous castings；3) Homogenization Treatments and pretreated magnesium alloy rod will be passed through, carry out Splicing Mechanism, being made can the high energy-absorbing magnesium alloy pipe of depth clod wash.
Description
Technical field
The invention belongs to metal material technology and metallurgical technology fields, and in particular to a kind of high energy-absorbing magnesium alloy of middle plasticity and
Can depth clod wash tubing preparation facilities and method.
Background technique
Magnesium alloy has many advantages, such as that density is small, more excellent than strong high and damping, electromagnetic wave shielding and machining property,
It is structure lightened ideal material.Magnesium alloy extrusion tubing is the important bulk product shape of wrought magnesium alloy structural member production
Formula can be widely applied to the civil fields such as bicycle, wheelchair, beach chair, outdoor furniture, sports equipment, be also widely applied to
The fields such as aerospace and military project.But when pipe component production, it is related to squeezing the bending of tubing in many cases and variable diameter (expands
Diameter or undergauge) etc. secondary plastic formings process.
Magnesium metal and its alloy (in addition to Mg-Li based alloy) are close-packed hexagonal lattice structure, and independent slip-system is few, plasticity
Difference causes plastic formability poor, no matter the bending of its tube extrusion or tubing etc. it is secondary forming be required to be heated to it is higher
At a temperature of carry out, and since there is also more significant anisotropy and tension and compression surrender are strong for the mechanical property of magnesium alloy materials
Asymmetry is spent, some researches show that traditional magnesium alloy AZ31 compared to aluminium alloy and steel, has more excellent energy absorption characteristics.
Common AZ system magnesium alloy (such as AZ31 and AZ61) be easy to cause tubing transverse breakage or extruding in hot bending
Soldering seam cracking.These problems reduce the lumber recovery of magnesium-alloy tube component, significantly improve processing cost, and it is competing to reduce market
Strive power.
Good plasticity is the premise of high formability, but even if the tubing of the excellent aluminium alloy of plasticity ratio magnesium alloy carry out it is cold
Also phenomenon of rupture can often occur when curved, i.e., including aluminium alloy and magnesium alloy, the secondary deformation ability for deforming material depends on change
The Deformation structure of shape material preparation process and its good control of orientation.For magnesium alloy pipe bending deformation process, different parts
It is respectively subjected to tensile stress and compression, and magnesium alloy has significant anisotropy feature and tension and compression asymmetry, this meaning
Even the tubing of high plastic magnesium alloy its bending deformation be also more difficult.Some researches show that be not added the Φ of plug
It just will be unable to keep the consistency of internal diameter when clod wash is to 40 ° under 20AZ31 magnesium alloy extruded tube room temperature, continuing deformation can then be rolled over
It is disconnected, and AZ31 is squeezed when square tube is bent about 30 ° and is cracked.Therefore, industrial magnesium alloy pipe includes bending and becomes at present
The secondary deformations such as diameter mostly use thermal processing method, must 250 DEG C or higher temperature heating to realize tubing it is good it is secondary at
Shape.This does not only result in the complication of deformation technique and equipment, significantly affects the mechanical property of tubing members yet.
A large number of studies show that appropriate rare earth is added into magnesium alloy can weaken texture, also some researches show that magnesium alloy
In add heavy rare earth element Gd on a small quantity the plastic deformation ability of magnesium alloy can be improved, but heavy rare earth is expensive, even if adding
Dosage less can also greatly improve its material cost, and the light rare earths such as Ce, La, Sm this inexpensively much, about five points of heavy rare earth
One of.It is worth mentioning that being cleaning molten, significantly enhancing the mobility of melt, to greatly improve after rare earth is added
The lumber recovery of magnesium alloy.Studies have pointed out that wide-angle clod wash can be realized under conditions of not by heat treatment or pre-stretching
The generally very high plasticity of magnesium alloy and lower yield tensile ratio, however its lower intensity limits its application.
In addition, some researches show that traditional magnesium alloy AZ31 compared to aluminium alloy and steel, it is special with more excellent energy-absorbing
Property.But under impact of head, deformation limit intensity and the energy-absorbing displacement of traditional magnesium alloy AZ31 is all undesirable, under impact alloy
The energy gently absorbed is less, and higher deformation limit intensity leads to not play the protective effect to impact body.
Summary of the invention
Current magnesium alloy and its tubing there are aiming at the problem that, overcome secondary operation existing for existing magnesium alloy pipe to shape
Property is poor, and the problems such as plug cannot keep aperture consistency at bending deformation is not added in small diameter thin-walled, and the present invention is provided in one kind and moulded
Property high energy-absorbing magnesium alloy and can depth clod wash tubing preparation facilities and method, this method provides one kind, and there is middle plasticity height to inhale
Can magnesium alloy, while provide it is a kind of correspond to the magnesium alloy can depth clod wash tubing preparation facilities and method.
The high energy-absorbing magnesium alloy of middle plasticity of the invention is Mg-Zn-Ce-La-Mn-Zr-Ca system magnesium alloy；Its ingredient presses matter
Amount percentage is respectively as follows: Zn:1.5~2.2%, Ce:0.2~0.7%, La:0.1~0.2%, Mn:0.3~0.9%, Zr:
0.06~0.6%, Ca:0.1~0.3%, surplus are Mg and impurity, wherein by mass percentage, (2~7) Ce: La=: 1, Mn
: Zr=(1.5~5): 1, impurity F e < 0.003%.
It is of the invention can depth clod wash tubing preparation facilities comprising hollow pressure ram, shunts Splicing Mechanism upper mold
Squeeze lower die, extrusion cylinder, extruding pad and turbocharging cooling system；Extrusion cylinder, which is assemblied in, to be squeezed on pedestal, bottom in extrusion cylinder
Portion is equipped with pressure ram, and extruding pad is connected on pressure ram, and Splicing Mechanism mold is located at extrusion cylinder exit, and turbocharging is cold
But system is located at extrusion die exit, is cooled down to prepare magnesium alloy pipe；
The Splicing Mechanism upper mold is equipped with tap hole, straight mouth shunt bridge, mold core；Tap hole is that metal leads to type hole
Channel, shunt bridge are the brackets of carrying mold cores, and mold core is used to be formed the shape and size of profile inner cavity, tap hole use inside half
The semiellipse design of circle outside, tap hole occupied area ratio are 0.3~0.6；
The Splicing Mechanism lower die is equipped with bonding container, die hole type chamber, straight mouth work belt, horn mouth work belt；Soldering
The metal collection that tap hole flows out, weldering collectively forms the monolith centered on mold core again together for room, due to metal
Constantly aggregation, static pressure constantly increases, until extruding metal is gone out die hole；In order to guarantee to squeeze tubing weldquality, work belt
Using straight mouth and horn mouth composite design, straight mouth work belt diameter and horn mouth work belt diameter ratio are 1.05~1.20,
Work 3~5mm of belt length.
The high energy-absorbing magnesium alloy of middle plasticity of the invention can depth clod wash tubing preparation method, specifically include following step
It is rapid:
Step 1, melting:
(1) magnesium metal is heated to 730~740 DEG C of fusings under flux protection, is matched by the high energy-absorbing magnesium alloy of middle plasticity
It calculates to be added and Zn is first added, after Zn all melts, add Mg-Zr intermediate alloy and MnCl2Particle；
(2) it after melt being cooled to 705~715 DEG C, calculates and is added among Mg-Ca by the high energy-absorbing magnesium alloy proportion of middle plasticity
Alloy, Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, among Mg-La
The addition of alloy is without sequencing requirement；
(3) purified treatment is carried out to melt；
Step 2, semi-continuous casting:
Melt is cooled to 680~700 DEG C of progress semi-continuous castings, magnet exciting coil 5000~7500AT of number of ampere turns, electromagnetism
20~50Hz of frequency, casting speed are 80~200mm/min, and water is 11~19m3/ h obtains magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 330~420 DEG C of 8~14h of heat preservation；
(2) it to magnesium alloy rod after Homogenization Treatments, is pre-processed before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, the high energy-absorbing magnesium alloy pipe of depth clod wash is made；
Wherein, squeezing parameter meets following table:
Among the above the high energy-absorbing magnesium alloy of plasticity can depth clod wash tubing preparation method, in which:
In the step 1, solvent is No. five flux.
In the step 1, melting is carried out using melting resistance furnace or combustion gas smelting furnace.
In the step 1, melt is cooled to 705~715 DEG C of addition intermediate alloys, reason are as follows: wherein, Ce, La and Ca
Yield because extending with smelting time or the raising of melt temperature due to reduces, and the loss of Ca is bigger.
In the step 1, the adding manner of intermediate alloy is molten by carrying out leaching in the iron cage of suspention.
In the step 1, purified treatment is carried out to melt using No. five flux.
In the step 2, the cross-sectional diameter of magnesium alloy rod is 100~200mm of Φ.
In the step 3, pretreatment is scale and strips off the skin before Splicing Mechanism.
In the step 3, before magnesium alloy cast bar is squeezed, using grease based on molybdenum disulfide lithium as lubrication
Agent is uniformly applied on the inner wall of Surface of Rod Bar and extrusion cylinder.
Cross-sectional diameter 15~25.4mm of Φ of depth clod wash magnesium alloy pipe made from the method for the present invention, wall thickness 1.8
~5mm.
Compared with prior art, the features of the present invention and beneficial effect are:
(1) formula of middle plasticity magnesium alloy of the invention has the characteristics that low Zn and low RE alloyed, and uses light rare earth
The micro addition of combination, while addition is combined using Mn and Zr；
(2) present invention is using positive Splicing Mechanism method, passes through the reasonable of the Curve guide impeller of extrusion die and extrusion process
Control, squeezes out the tubing of excellent surface quality and the good different cross section of soldering, prepared magnesium alloy pipe may be implemented
Depth clod wash is not cracked；
(3) magnesium alloy extrusion tubing of the invention has extremely good depth cold bending, thin compared to clod wash AZ31
Wall is not in control 50 ° and cracks, and it is good that cast is also able to maintain when the clod wash of this alloy reaches 90 ° of even higher angles；
(4) present invention carries out melt using the mode of Mn+Zr dual except iron, guarantee Fe < 0.003%, and avoids
Mn or Zr is segregated the adverse effect to plasticity；
(5) present invention uses the design of inner circular outboard square-like using Splicing Mechanism mold diversion mouth, increases shunting
The sectional area in hole makes soldering chamber be easier to be full of, and reduces extruding force.Work belt uses straight mouth and bell-mouthed composite design side
Case guarantees while scale removal and other field trashes, and promotes weldquality；
(6) present invention is added using the cheap micro combination of Ce and La light rare earth, is guaranteeing magnesium alloy materials low cost
Under the premise of, realize the secondary cold formability of magnesium alloy；
(7) there is middle plasticity magnesium alloy of the invention smaller bending deformation ultimate strength and longer energy-absorbing to be displaced,
The energy of 3 points of curved absorptions is 1.2~1.5 times of AZ31；
(8) energy absorption ability of middle plasticity magnesium alloy of the invention has the characteristic for not changing with pressure head rate and changing.
(9) present invention is rapidly cooled the high temperature extrusion tubing in exit using turbocharging cooling system, effectively
Prevent crystal grain to grow up, improve pipe performance.
Detailed description of the invention
Magnesium alloy prepared by Fig. 1 embodiment of the present invention 1 a) casts state tissue, b) As-extruded tissue；
Fig. 2 thin-wall tube clod wash photo: a) comparison AZ31 alloy pipe；B) magnesium alloy prepared by the embodiment of the present invention 4；
Fig. 3 magnesium alloy Splicing Mechanism schematic device of the present invention；Wherein 1: pressure ram；2: extrusion cylinder；3: Splicing Mechanism mould
Lower die；4: Splicing Mechanism mould upper mold；5: extruding pad；6 turbocharging cooling systems；
The structural schematic diagram and tap hole sectional view of extrusion die in Fig. 4 magnesium alloy extrusion device of the present invention；Wherein 7: point
Discharge orifice；8: soldering chamber；9: straight mouth work belt；10: horn mouth work belt；11: die hole type chamber；12: mold core；13: straight mouth shunt bridge；
The magnesium alloy extrusion blank photo of Fig. 5 embodiment of the present invention 1-4 preparation；
The tensile sample dimensional drawing of the extruded bar from magnesium alloy of Fig. 6 embodiment of the present invention 1-4 preparation；
The extruding tissue SEM photograph of magnesium alloy extrusion tubing prepared by Fig. 7 embodiment of the present invention 2；
Magnesium alloy extrusion tubing stretching fracture pattern prepared by Fig. 8 embodiment of the present invention 3；
3 points of curved experiment photos of Fig. 9: a) comparison AZ31 alloy pipe；B) magnesium alloy prepared by the embodiment of the present invention 4 squeezes
Pressure pipe material；
Figure 10 energy-absorbing-displacement curve: a) comparison AZ31 alloy pipe；B) magnesium alloy prepared by the embodiment of the present invention 4 squeezes
Pressure pipe material；
Specific embodiment
Mg, Zn are added using level-one magnesium ingot, zinc ingot metal, aluminium ingot pure metal in following example 1~4, and Mn uses MnCl2Add
Enter, Zr, Ca, Ce and La are added using intermediate alloy, and flux is market purchase.
Energy-absorbing experiment uses 3 points of curved experiments, plate three of the standard referring to GB/T 232-2010 in following example 1~4
The curved standard of point.
Following example 1~4 be all made of can depth clod wash tubing preparation facilities as shown in figure 3, include hollow extruding
Bar 1, extrusion cylinder 2, Splicing Mechanism upper mold 3, Splicing Mechanism lower die 4, extruding pad 5 and turbocharging cooling system 6；Extrusion cylinder 2
It is assemblied in and squeezes on pedestal, bottom is equipped with pressure ram 1 in extrusion cylinder, and extruding pad 5 is connected to 1 on pressure ram, Splicing Mechanism
Upper mold 3 and Splicing Mechanism lower die 4 are located at 2 exit of extrusion cylinder, and turbocharging cooling system 6 is located at extrusion die exit, is
Magnesium alloy pipe is prepared to be cooled down；The structural schematic diagram of extrusion die and tap hole sectional view are as schemed in magnesium alloy extrusion device
Shown in 4；
The Splicing Mechanism upper mold is equipped with tap hole 7, mold core 12, straight mouth shunt bridge 13；Tap hole 7 is that metal leads to
The channel of type hole, shunt bridge 13 are the brackets of carrying mold cores 12, and mold core 12 is used to be formed the shape and size of profile inner cavity, are shunted
Semiellipse design on the outside of semicircle on the inside of 7 use of hole, 7 occupied area ratio of tap hole are 0.3~0.6；
The Splicing Mechanism lower die is equipped with bonding container 8, die hole type chamber 11, straight mouth work belt 9, horn mouth work belt
10；The metal collection that tap hole 7 flows out, weldering collectively forms the entirety centered on mold core 12 to bonding container 8 again together
Material, since metal is constantly assembled, static pressure constantly increases, until extruding metal is gone out die hole；In order to guarantee to squeeze tubing weld seam
Quality, work belt use straight mouth and horn mouth composite design, straight 9 diameter of mouth work belt and 10 diameter ratio of horn mouth work belt
It is 1.05~1.20, work 3~5mm of belt length.
Following example 1~4 preparations magnesium alloy extrusion blank photo is as shown in Figure 5.
Embodiment 1
A kind of high energy-absorbing magnesium alloy is Mg-Zn-Ce-La-Mn-Zr-Ca system magnesium alloy；Its ingredient contains by mass percentage
Have: Zn:1.5%, Ce:0.4%, La:0.2%, Mn:0.5%, Zr:0.2%, Ca:0.2%, surplus are Mg and impurity；Wherein,
By mass percentage, Ce: La=2: 1, Mn: Zr=2.5: 1, impurity F e < 0.003%.
The present embodiment can the high energy-absorbing magnesium alloy pipe of depth clod wash preparation method, specifically comprise the following steps:
Step 1, melting:
(1) magnesium metal is heated to 730 DEG C of fusings under No. five flux protections, based on the high energy-absorbing magnesium alloy proportion of middle plasticity
It calculates, Zn is first added, after Zn all melts, add Mg-Zr intermediate alloy and MnCl2Particle；
(2) after melt being cooled to 710 DEG C, calculated by middle plasticity high energy-absorbing magnesium alloy proportion be added Mg-Ca intermediate alloy,
Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, Mg-La intermediate alloy
Addition is without sequencing requirement；
(3) purified treatment is carried out to melt using No. five flux；
Step 2, semi-continuous casting:
Melt is cooled to 690 DEG C of progress semi-continuous castings, magnet exciting coil number of ampere turns 5000AT, electromagnetic frequency 20Hz, casting
Making speed is 200mm/min, water 16.17m3/ h, obtaining specification is Φ 100mm × 5800mm magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 380 DEG C of heat preservation 8h；
(2) to magnesium alloy rod after Homogenization Treatments, scale is carried out and the pretreatment that strips off the skin before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, before extruding, in extrusion die inner wall, magnesium alloy sample
Product surface and extrusion cylinder inner wall are smeared grease based on molybdenum disulfide lithium and are lubricated, and extruding muzzle velocity is 4m/min, extrusion ratio
It is 72.87, the high energy-absorbing magnesium alloy pipe of depth clod wash is made.
The cross-sectional diameter of depth clod wash magnesium alloy pipe made from the present embodiment is Φ 19mm, wall thickness 1.8mm；The magnesium
Alloy pipe as cast condition and As-extruded microscopic structure as shown in Figure 1, be processed into tensile sample as shown in FIG. 6,
Room temperature tensile, tensile speed 1mm/min, room temperature tensile mechanical property such as 1 institute of table are carried out on Instron8032 stretching-machine
Show.
The yield tensile ratio of magnesium alloy pipe made from the present embodiment be 0.49, under squeezed state can directly clod wash to 90 °,
The curved experiment of 3 points of the alloy absorbs 1.4 times that energy is AZ31.
The magnesium alloy extrusion tubing room temperature tensile mechanical property of 1 embodiment 1 of table
| Specimen coding | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| 1 | 257.0 | 123.3 | 28.5 |
| 2 | 259.6 | 125.0 | 27.0 |
| 3 | 258.6 | 128.3 | 27.2 |
| Average value | 258.4 | 125.5 | 27.7 |
Embodiment 2
A kind of high energy-absorbing magnesium alloy is Mg-Zn-Ce-La-Mn-Zr-Ca system magnesium alloy；Its ingredient contains by mass percentage
Have: Zn:2.2%, Ce:0.7%, La:0.1%, Mn:0.3%, Zr:0.06%, Ca:0.3%, surplus are Mg and impurity；Its
In, by mass percentage, Ce: La=7: 1, Mn: Zr=5: 1, impurity F e < 0.003%.
The present embodiment can the high energy-absorbing magnesium alloy pipe of depth clod wash preparation method, specifically comprise the following steps:
Step 1, melting:
(1) magnesium metal is heated to 730 DEG C of fusings under No. five flux protections, based on the high energy-absorbing magnesium alloy proportion of middle plasticity
It calculates, Zn is first added, after Zn all melts, add Mg-Zr intermediate alloy and MnCl2Particle；
(2) after melt being cooled to 710 DEG C, calculated by middle plasticity high energy-absorbing magnesium alloy proportion be added Mg-Ca intermediate alloy,
Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, Mg-La intermediate alloy
Addition is without sequencing requirement；
(3) purified treatment is carried out to melt using No. five flux；
Step 2, semi-continuous casting:
Melt is cooled to 700 DEG C of progress semi-continuous castings, magnet exciting coil number of ampere turns 7500AT, electromagnetic frequency 45Hz, casting
Making speed is 160mm/min, water 16.17m3/ h, obtaining specification is Φ 100mm × 5800mm magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 330 DEG C of heat preservation 10h；
(2) to magnesium alloy rod after Homogenization Treatments, scale is carried out and the pretreatment that strips off the skin before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, before extruding, in extrusion die inner wall, magnesium alloy sample
Product surface and extrusion cylinder inner wall are smeared grease based on molybdenum disulfide lithium and are lubricated, and extruding muzzle velocity is 7m/min, extrusion ratio
It is 33.5, the high energy-absorbing magnesium alloy pipe of depth clod wash is made.
The cross-sectional diameter of depth clod wash magnesium alloy pipe made from the present embodiment is Φ 25.4mm, and wall thickness is the magnesium of 3mm
Alloy extrusion tubing；The magnesium alloy cast and squeeze tube extrusion tissue SEM photograph as shown in fig. 7, sampled be processed into as
Attached tensile sample shown in fig. 6, carries out room temperature tensile on Instron8032 stretching-machine, and tensile speed 1mm/min is squeezed
Tubing room temperature tensile mechanical property is as shown in table 2.
Magnesium alloy pipe yield tensile ratio made from the present embodiment be 0.48, under squeezed state can directly clod wash to 90 °, should
3 points of alloy curved experiments absorb 1.2 times that energy is AZ31.
The room temperature tensile mechanical property of the magnesium alloy extrusion tubing As-extruded of 2 example 2 of table
| Specimen coding | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| 1 | 260.0 | 123.0 | 27 |
| 2 | 255.6 | 120.3 | 28 |
| 3 | 257.2 | 125.2 | 27.5 |
| Average value | 257.6 | 122.8 | 27.5 |
Embodiment 3
A kind of high energy-absorbing magnesium alloy is Mg-Zn-Ce-La-Mn-Zr-Ca system magnesium alloy；Its ingredient contains by mass percentage
Have: Zn:1.7%, Ce:0.4%, La:0.2%, Mn:0.4%, Zr:0.1%, Ca:0.2%, surplus are Mg and impurity；Wherein,
By mass percentage, Ce: La=2: 1, Mn: Zr=4: 1, impurity F e < 0.003%.
The present embodiment can the high energy-absorbing magnesium alloy pipe of depth clod wash preparation method, specifically comprise the following steps:
Step 1, melting:
(1) magnesium metal is heated to 730 DEG C of fusings under No. five flux protections, based on the high energy-absorbing magnesium alloy proportion of middle plasticity
It calculates, Zn is first added, after Zn all melts, add Mg-Zr intermediate alloy and MnCl2Particle；
(2) after melt being cooled to 710 DEG C, calculated by middle plasticity high energy-absorbing magnesium alloy proportion be added Mg-Ca intermediate alloy,
Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, Mg-La intermediate alloy
Addition is without sequencing requirement；
(3) purified treatment is carried out to melt using No. five flux；
Step 2, semi-continuous casting:
Melt is cooled to 700 DEG C of progress semi-continuous castings, magnet exciting coil number of ampere turns 6500AT, electromagnetic frequency 50Hz, casting
Making speed is 155mm/min, water 16.17m3/ h, obtaining specification is Φ 100mm × 5800mm magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 400 DEG C of heat preservation 12h；
(2) to magnesium alloy rod after Homogenization Treatments, scale is carried out and the pretreatment that strips off the skin before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, before extruding, in extrusion die inner wall, magnesium alloy sample
Product surface and extrusion cylinder inner wall are smeared grease based on molybdenum disulfide lithium and are lubricated, and extruding muzzle velocity is 4m/min, extrusion ratio
It is 45.1, the high energy-absorbing magnesium alloy pipe of depth clod wash is made.
The cross-sectional diameter of depth clod wash magnesium alloy pipe made from the present embodiment is the magnesium alloy that Φ 15mm wall thickness is 5mm
Squeeze tubing；The extruding tubing stretching fracture pattern of the magnesium alloy is as shown in figure 8, tubing sampling is processed into as shown in Fig. 6
Tensile sample, room temperature tensile, tensile speed 1mm/min are carried out on Instron8032 stretching-machine；Squeeze tubing drawing force
It is as shown in table 3 to learn performance.
Magnesium alloy pipe yield tensile ratio made from the present embodiment be 0.49, under squeezed state can directly clod wash to 90 °, should
3 points of alloy curved experiments absorb 1.3 times that energy is AZ31.
The room temperature tensile mechanical property of the magnesium alloy extrusion tubing As-extruded of 3 example 3 of table
Embodiment 4
A kind of high energy-absorbing magnesium alloy is Mg-Zn-Ce-La-Mn-Zr-Ca system magnesium alloy；Its ingredient contains by mass percentage
Have: Zn:2.0%, Ce:0.5%, La:0.15%, Mn:0.9%, Zr:0.6%, Ca:0.2%, surplus are Mg and impurity；Its
In, by mass percentage, (2~7) Ce: La=: 1, Mn: Zr=1.5: 1, impurity F e < 0.003%.
The present embodiment can the high energy-absorbing magnesium alloy pipe of depth clod wash preparation method, specifically comprise the following steps:
Step 1, melting:
(1) magnesium metal is heated to 730 DEG C of fusings under No. five flux protections, based on the high energy-absorbing magnesium alloy proportion of middle plasticity
It calculates, Zn is first added, after Zn all melts, add Mg-Zr intermediate alloy and MnCl2Particle；
(2) after melt being cooled to 710 DEG C, calculated by middle plasticity high energy-absorbing magnesium alloy proportion be added Mg-Ca intermediate alloy,
Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, Mg-La intermediate alloy
Addition is without sequencing requirement；
(3) purified treatment is carried out to melt using No. five flux；
Step 2, semi-continuous casting:
Melt is cooled to 680 DEG C of progress semi-continuous castings, magnet exciting coil number of ampere turns 7000AT, electromagnetic frequency 35Hz,
Casting speed is 160mm/min, water 16.17m3/ h, obtaining specification is Φ 100mm × 5800mm magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 420 DEG C of heat preservation 14h；
(2) to magnesium alloy rod after Homogenization Treatments, scale is carried out and the pretreatment that strips off the skin before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, before extruding, in extrusion die inner wall, magnesium alloy sample
Product surface and extrusion cylinder inner wall are smeared grease based on molybdenum disulfide lithium and are lubricated, and extruding muzzle velocity is 5m/min, extrusion ratio
It is 54, the high energy-absorbing magnesium alloy pipe of depth clod wash is made.
The cross-sectional diameter of depth clod wash magnesium alloy pipe made from the present embodiment is the magnesium that Φ 22.2mm wall thickness is 1.8mm
Alloy extrusion tubing；Tensile sample as shown in Fig. 6 is processed into the sampling of As-extruded bar, in Instron8032 stretching-machine
Upper carry out room temperature tensile, tensile speed 1mm/min.It is as shown in table 4 to squeeze tubing tensile mechanical properties.
The room temperature tensile mechanical property of the magnesium alloy extrusion tubing As-extruded of 4 example 4 of table
| Specimen coding | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| 1 | 260 | 125.1 | 30 |
| 2 | 258.3 | 120.4 | 29.6 |
| 3 | 258.7 | 123.2 | 29.0 |
| Average value | 266.2 | 122.9 | 29.2 |
Clod wash is to 90 ° of obvious slight cracks of appearance under squeezed state for traditional AZ31 alloy pipe, and the magnesium alloy pipe is in phase
With under the conditions of can directly clod wash to 90 °, surface is flawless, yield tensile ratio 0.48, and clod wash sample is as shown in Figure 2；The alloy three
The curved experiment of point absorbs 1.5 times that energy is AZ31, and 3 points of curved experiment photos are as shown in figure 9, energy-absorbing-displacement curve such as Figure 10 institute
Show.
Claims (6)
1. a kind of high energy-absorbing magnesium alloy of middle plasticity can depth clod wash tubing preparation facilities, which is characterized in that the device includes
Hollow pressure ram, Splicing Mechanism upper mold, Splicing Mechanism lower die, extrusion cylinder, extruding pad and turbocharging cooling system；It squeezes
Wound packages, which fits over, to be squeezed on pedestal, and bottom is equipped with pressure ram in extrusion cylinder, and extruding pad is connected on pressure ram, Splicing Mechanism mould
Tool is located at extrusion cylinder exit, and turbocharging cooling system is located at extrusion die exit；Splicing Mechanism upper mold, which is equipped with, to be shunted
Hole, straight mouth shunt bridge, mold core；Tap hole is the channel that metal leads to type hole, and shunt bridge is the bracket of carrying mold cores, and mold core is used to
The shape and size of profile inner cavity are formed, semiellipse design, tap hole occupied area ratio are on the outside of semicircle on the inside of tap hole use
0.3~0.6；Splicing Mechanism lower die is equipped with bonding container, die hole type chamber, straight mouth work belt, horn mouth work belt；Work belt uses
Straight mouth and horn mouth composite design, straight mouth work belt diameter and horn mouth work belt diameter ratio are 1.05 ~ 1.20, straight mouth work
Make band to be connected with the wide mouth end of horn mouth work belt, work belt length 3 or 5mm；Described device is used to prepare the high energy-absorbing of middle plasticity
Magnesium alloy, the ingredient of the magnesium alloy are respectively as follows: Zn:1.5 ~ 2.2% by mass percentage, and Ce:0.2 ~ 0.7%, La:0.1 ~
0.2%, Mn:0.3 ~ 0.9%, Zr:0.06 ~ 0.6%, Ca:0.1 ~ 0.3%, surplus are Mg and impurity, wherein by mass percentage,
Ce:La=(2 ~ 7): 1, Mn:Zr=(1.5 ~ 5): 1, impurity F e < 0.003%.
2. a kind of high energy-absorbing magnesium alloy of middle plasticity can depth clod wash tubing preparation method, use is described in claim 1
Can depth clod wash tubing preparation facilities, which is characterized in that specific step is as follows:
Step 1, melting:
(1) magnesium metal is heated to 730 ~ 740 DEG C of fusings under flux protection, calculates and adds by the high energy-absorbing magnesium alloy proportion of middle plasticity
Enter and Zn is first added, after Zn all melts, adds Mg-Zr intermediate alloy and MnCl2Particle；Wherein, the middle plasticity height is inhaled
Can magnesium alloy, the ingredient of the magnesium alloy is respectively as follows: Zn:1.5 ~ 2.2% by mass percentage, Ce:0.2 ~ 0.7%, La:0.1 ~
0.2%, Mn:0.3 ~ 0.9%, Zr:0.06 ~ 0.6%, Ca:0.1 ~ 0.3%, surplus are Mg and impurity, wherein by mass percentage,
Ce:La=(2 ~ 7): 1, Mn:Zr=(1.5 ~ 5): 1, impurity F e < 0.003%；
(2) after melt being cooled to 705 ~ 715 DEG C, calculated by middle plasticity high energy-absorbing magnesium alloy proportion be added Mg-Ca intermediate alloy,
Mg-Ce intermediate alloy and Mg-La intermediate alloy, in which: Mg-Ca intermediate alloy, Mg-Ce intermediate alloy, Mg-La intermediate alloy
Addition is without sequencing requirement；
(3) purified treatment is carried out to melt；
Step 2, semi-continuous casting:
Melt is cooled to 680 ~ 700 DEG C of progress semi-continuous castings, magnet exciting coil 5000 ~ 7500AT of number of ampere turns, electromagnetic frequency 20 ~
50Hz, casting speed are 80 ~ 200mm/min, and water is 11 ~ 19m3/ h obtains magnesium alloy cast bar；
Step 3, Splicing Mechanism:
(1) Homogenization Treatments: by magnesium alloy cast bar in 330 ~ 420 DEG C of 8 ~ 14h of heat preservation；
(2) it to magnesium alloy rod after Homogenization Treatments, is pre-processed before carrying out Splicing Mechanism；
(3) by pretreated magnesium alloy rod, Splicing Mechanism is carried out, squeezing parameter meets following table, and being made can depth clod wash height
Energy-absorbing magnesium alloy pipe,
。
3. it is according to claim 2 can depth clod wash tubing preparation method, which is characterized in that in the step 2, magnesium
The cross-sectional diameter of alloy bar material is100~200mm。
4. it is according to claim 2 can depth clod wash tubing preparation method, which is characterized in that in the step 3, point
Pretreatment is scale and strips off the skin before stream squeezes.
5. it is according to claim 2 can depth clod wash tubing preparation method, which is characterized in that in the step 3, magnesium
Alloy casting bar squeezed before, using grease based on molybdenum disulfide lithium as lubricant, be uniformly applied to Surface of Rod Bar with
On the inner wall of extrusion cylinder.
6. it is according to claim 2 can depth clod wash tubing preparation method, which is characterized in that, can in the step 3
The cross-sectional diameter of the high energy-absorbing magnesium alloy pipe of depth clod wash is15 ~ 25.4mm, wall thickness are 1.8 ~ 5mm.
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