CN109084008A - Magnesium alloy gear box casing and preparation method thereof - Google Patents
Magnesium alloy gear box casing and preparation method thereof Download PDFInfo
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- CN109084008A CN109084008A CN201810983431.2A CN201810983431A CN109084008A CN 109084008 A CN109084008 A CN 109084008A CN 201810983431 A CN201810983431 A CN 201810983431A CN 109084008 A CN109084008 A CN 109084008A
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- box casing
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 114
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 claims abstract description 111
- 238000004321 preservation Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000011777 magnesium Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000004512 die casting Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 12
- 238000007711 solidification Methods 0.000 claims abstract description 12
- 230000008023 solidification Effects 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002680 magnesium Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- 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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/03—Gearboxes; Mounting gearing therein characterised by means for reinforcing gearboxes, e.g. ribs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/032—Gearboxes; Mounting gearing therein characterised by the materials used
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Gears, Cams (AREA)
- General Details Of Gearings (AREA)
Abstract
A kind of magnesium alloy gear box casing and preparation method thereof, belongs to alloy casting technology field.The preparation method is the following steps are included: melting, refining magnesium alloys raw material, obtain magnesium alloy, the magnesium alloy has following components by weight percentage: 8.2~8.6%Al, 0.15~0.43%Mn, 0.51~0.78%Zn, 0.33~0.65%Re, 0.85~1.37%Ti, remaining is Mg and impurity；Magnesium alloy is poured into solidification, die-casting process in the mold of preheating and obtains casting；Casting is heat-treated, casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, is taken out after being then cooled to 195~215 DEG C of 1.5~2.5h of heat preservation.The preparation method of magnesium alloy gear box casing provided by the invention can effectively improve the toughness and intensity of casting, improve its mechanical performance.The present invention also provides a kind of magnesium alloy gear box casings.
Description
Technical field
The present invention relates to alloy casting technology fields, in particular to a kind of magnesium alloy gear box casing and its preparation
Method.
Background technique
Magnesium alloy is that by essential element of magnesium and the alloy that other elements form is added, with the small (1.8g/cm of density3
Left and right), intensity is high, elasticity modulus is big, heat dissipation and absorb shock resistance are good, absorb impact load-carrying ability big, resistance to organic matter and caustic corrosion
The good advantage of energy, therefore, magnesium alloy are widely used in vehicle manufacturing industry especially in vehicle gear box industry, still
Compared with aluminium alloy, the toughness of magnesium alloy is poor, causes it to be easy to produce crackle when being vibrated for a long time or generates brittleness
Fracture, influences its use.
Meet the use of automobile industry gear box casing therefore, it is necessary to a kind of magnesium alloy with high intensity and high tenacity
Demand.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation methods of magnesium alloy gear box casing, can effectively improve casting
The toughness and intensity of part, improve its mechanical performance.
Another object of the present invention is to provide a kind of magnesium alloy gear box casings, with compression strength height, good toughness
The advantages of.
The embodiment of the present invention is achieved in that
A kind of preparation method of magnesium alloy gear box casing, comprising the following steps:
Melting, refining magnesium alloys raw material obtain magnesium alloy, which has following components by weight percentage:
8.2~8.6%Al, 0.15~0.43%Mn, 0.51~0.78%Zn, 0.33~0.65%Re, 0.85~1.37%Ti, remaining
For Mg and inevitable impurity；
Magnesium alloy is poured into solidification, die-casting process in the mold of preheating and obtains casting；
Casting is heat-treated；Heat treatment is that casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, then cooling
It is taken out after to 185~215 DEG C of 1.5~2.5h of heat preservation.
In preferred embodiments of the present invention, above-mentioned cooling is that casting is placed natural cooling.
In preferred embodiments of the present invention, in above-mentioned heat treatment, by casting be heated to 445~470 DEG C heat preservation 0.5~
When 3.5h, casting is heated to 445~455 DEG C of 0.5~1.5h of heat preservation first, is then heated to 460~470 DEG C of 2~3h of heat preservation.
In preferred embodiments of the present invention, in above-mentioned heat treatment, by casting in 185~215 DEG C of 1.5~2.5h of heat preservation
When, casting is cooled to 205~215 DEG C of 0.5~1h of heat preservation first, is then cooled to 185~200 DEG C of 1~2h of heat preservation.
In preferred embodiments of the present invention, above-mentioned further includes that subzero treatment, deep cooling are carried out after being heat-treated to casting
Processing is that casting is cooled to -215~-185 DEG C of 3.5~5.5h of heat preservation.
In preferred embodiments of the present invention, when above-mentioned subzero treatment, casting is cooled to -195~-185 DEG C of guarantors first
1.5~2.5h of temperature is then cooled to -215~-205 DEG C of 2~3h of heat preservation.
In preferred embodiments of the present invention, it is above-mentioned casting is heat-treated after will casting place 48~172h after carry out
Subzero treatment.
It is above-mentioned that subzero treatment is carried out to casting using liquid nitrogen in preferred embodiments of the present invention.
In preferred embodiments of the present invention, it is above-mentioned magnesium alloy is poured into mold before, mold is preheated to 315~
335℃。
It is the system using above-mentioned magnesium alloy gear box casing the present invention also provides a kind of magnesium alloy gear box casing
Preparation Method is prepared.
The beneficial effect of the embodiment of the present invention is: the preparation method of magnesium alloy gear box casing provided in an embodiment of the present invention
The following steps are included: melting, refining magnesium alloys raw material, magnesium alloy is obtained, which has by weight percentage following
Component: 8.2~8.6%Al, 0.15~0.43%Mn, 0.51~0.78%Zn, 0.33~0.65%Re, 0.85~1.37%
Ti, remaining is Mg and inevitable impurity；Magnesium alloy is poured into solidification, die-casting process in the mold of preheating and obtains casting；
Casting is heat-treated；Heat treatment is that casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, it is then cooled to 195~
It is taken out after 215 DEG C of 1.5~2.5h of heat preservation.The preparation method of magnesium alloy gear box casing provided by the invention can be improved effectively
The toughness and intensity of casting, improve its mechanical performance.The present invention also provides the preparations for using above-mentioned magnesium alloy gear box casing
The magnesium alloy gear box casing that method is prepared, with compression strength height, the advantages of good toughness.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
The preparation method of magnesium alloy gear box casing provided in an embodiment of the present invention is specifically described below.
The embodiment of the invention provides a kind of preparation methods of magnesium alloy gear box casing, comprising the following steps:
Melting, refining magnesium alloys raw material obtain magnesium alloy, which has following components by weight percentage:
8.2~8.6%Al, 0.15~0.43%Mn, 0.51~0.78%Zn, 0.33~0.65%Re, 0.85~1.37%Ti, remaining
For Mg and inevitable impurity；
Magnesium alloy is poured into solidification, die-casting process in the mold of preheating and obtains casting；Preferably, magnesium alloy is poured into
Before in mold, mold is preheated to 315~335 DEG C.
Casting is heat-treated；Heat treatment is that casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, then cooling
It is taken out after to 185~215 DEG C of 1.5~2.5h of heat preservation.Preferably, cooling is that casting is placed natural cooling.It is furthermore preferred that at heat
In reason, when casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, casting is heated to 445~455 DEG C of heat preservations 0.5 first
~1.5h is then heated to 460~470 DEG C of 2~3h of heat preservation.It is further preferred that in heat treatment, by casting at 185~215 DEG C
When keeping the temperature 1.5~2.5h, casting is cooled to 205~215 DEG C of 0.5~1h of heat preservation first, is then cooled to 185~200 DEG C of guarantors
1~2h of temperature.
It is first by by magnesium alloy the embodiment of the invention provides a kind of preparation method of magnesium alloy gear box casing
Raw material melts according to the ratio, refines and obtains liquid magnesium alloy, and coagulation forming is then poured in mold after preheat and is added by die casting
Work handles to obtain casting, is finally heat-treated to casting；Wherein, by the way that the Re of appropriate range is added in raw material magnesium alloy
The thermal deformation behavior of magnesium alloy can be improved to improve its casting character, process medium casting is avoided to crack；By
The Ti that appropriate range is added in raw material magnesium alloy can make the crystal grain refinement of magnesium alloy, improve big crystal grain to the shadow of Properties of Magnesium Alloy
Ring, thus effectively improve magnesium alloy intensity and elongation, and make magnesium alloy in the case where hardness decline on a small quantity plasticity with
Toughness obtains biggish raising.It can make hardening constituent melt back by being heat-treated to casting, improve it while reducing hardness
Tensile strength and toughness avoid generating cracking phenomena in press casting procedure medium casting, improve the machining yield of casting.
The embodiment of the present invention provide magnesium alloy gear box casing preparation method further include casting be heat-treated it is laggard
Row subzero treatment, subzero treatment are that casting is cooled to -215~-185 DEG C of 3.5~5.5h of heat preservation.Preferably, using liquid nitrogen pair
Casting carries out subzero treatment.It is furthermore preferred that when subzero treatment, first by casting be cooled to -195~-185 DEG C of heat preservations 1.5~
2.5h is then cooled to -215~-205 DEG C of 2~3h of heat preservation.It is further preferred that casting is put after being heat-treated to casting
Subzero treatment is carried out after setting 48~172h.By carrying out subzero treatment to the casting after heat treatment, can be introduced into casting big
The plastic deformation ability of casting improves in the dislocation line of amount and fine grained texture, improves its toughness, produce it will not in press casting procedure
Raw cracking, improves the yield rate of Mechanical processing of casting.
It is the system using above-mentioned magnesium alloy gear box casing the present invention also provides a kind of magnesium alloy gear box casing
Preparation Method is prepared, which has the advantages of compression strength is high, good toughness.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S11, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.3%Al, 0.28%Mn, 0.65%Zn, 0.37%Re, 1.16%Ti, remaining is Mg and inevitable impurity；
S12, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Magnesium alloy is poured into mould
Before in tool, mold is preheated to 320 DEG C.
S13, casting is heat-treated；Casting is heated to 450 DEG C of heat preservation 1h, 465 heat preservation 2.5h is then heated to, puts
It sets casting to naturally cool to 210 DEG C of heat preservation 1h, be taken out after being then cooled to 190 DEG C of heat preservation 1h.
Embodiment 2
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S21, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.5%Al, 0.36%Mn, 0.57%Zn, 0.58%Re, 0.95%Ti, remaining is Mg and inevitable impurity；
S22, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Magnesium alloy is poured into mould
Before in tool, mold is preheated to 330 DEG C.
S23, casting is heat-treated；Heat treatment is that casting is heated to 455 DEG C of heat preservation 0.5h, is then heated to 460
DEG C heat preservation 3h, place casting naturally cool to 215 DEG C of heat preservation 0.5h, taken out after being then cooled to 195 DEG C of heat preservation 1.5h.
Embodiment 3
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S31, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.2%Al, 0.22%Mn, 0.58%Zn, 0.42%Re, 1.23%Ti, remaining is Mg and inevitable impurity；
S32, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Magnesium alloy is poured into mould
Before in tool, mold is preheated to 335 DEG C.
S33, casting is heat-treated；Heat treatment is that casting is heated to 470 DEG C of heat preservation 2h, then places casting certainly
It is taken out after being so cooled to 195 DEG C of heat preservation 2.5h.
Embodiment 4
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S41, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.6%Al, 0.18%Mn, 0.66%Zn, 0.45%Re, 1.03%Ti, remaining is Mg and inevitable impurity；
S42, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Preferably, magnesium alloy is poured
Before building in mold, mold is preheated to 315 DEG C.
S43, casting is heat-treated；Casting is heated to 465 DEG C of heat preservation 1.5h, is then heated to 470 DEG C of heat preservation 2h,
It places casting to naturally cool to 215 DEG C of heat preservation 1h, be taken out after being then cooled to 185 DEG C of heat preservation 2h.
S44, subzero treatment is carried out to casting, subzero treatment is carried out to casting using liquid nitrogen, be first cooled to casting-
195 DEG C of heat preservation 1.5h, are then cooled to -200 DEG C of heat preservation 3h, then take out casting.
Embodiment 5
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S51, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.5%Al, 0.25%Mn, 0.73%Zn, 0.36%Re, 0.91%Ti, remaining is Mg and inevitable impurity；
S52, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Magnesium alloy is poured into mould
Before in tool, mold is preheated to 320 DEG C.
S53, casting is heat-treated；Casting is heated to 445 DEG C of heat preservation 1.5h, is then heated to 460 DEG C of heat preservation 2h,
It places casting to naturally cool to 205 DEG C of heat preservation 0.5h, be taken out after being then cooled to 190 DEG C of heat preservation 1h.
S54, subzero treatment is carried out to casting；Casting is placed into 90h, subzero treatment is carried out to casting using liquid nitrogen, first
Casting is cooled to -190 DEG C of heat preservation 2h, -205 DEG C of heat preservation 2.5h is then cooled to, then takes out casting.
Embodiment 6
It is to handle to obtain using following processing method the embodiment of the invention provides a kind of magnesium alloy gear box casing:
S61, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.5%Al, 0.42%Mn, 0.68%Zn, 0.56%Re, 1.35%Ti, remaining is Mg and inevitable impurity；
S62, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Magnesium alloy is poured into mould
Before in tool, mold is preheated to 325 DEG C.
S63, casting is heat-treated；Heat treatment is that casting is heated to 470 DEG C of heat preservation 1.5h, is then heated to 475
DEG C heat preservation 2h, later place casting naturally cool to 205 DEG C of heat preservation 1h, taken out after being then cooled to 195 DEG C of heat preservation 2h.
S64, subzero treatment is carried out to casting；It is carried out at deep cooling after casting is placed 125h after being heat-treated to casting
Reason carries out subzero treatment to casting using liquid nitrogen, casting is cooled to -185 DEG C of heat preservation 2.5h first, is then cooled to -215 DEG C
3h is kept the temperature, casting is then taken out.
Comparative example 1
Comparative example provides a kind of magnesium alloy gear box casing, is to handle to obtain using following processing method:
S71, melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with by weight percentage with the following group
Point: 8.3%Al, 0.39%Mn, 0.63%Zn, 0.4%Re, 1.17%Ti, remaining is Mg and inevitable impurity；
S72, magnesium alloy is poured into in the mold of preheating solidification, die-casting process obtains casting；Preferably, magnesium alloy is poured
Before building in mold, mold is preheated to 320 DEG C.
S73, casting is heat-treated；Heat treatment is that casting is heated to 400 DEG C of heat preservation 3h, and it is natural to take out casting later
It is cooling.
Above-described embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6 and comparative example 1 are prepared into
To magnesium alloy gear box casing be tested for the property, as a result as shown in table 1 below.
The performance of Mg alloy castings is prepared in 1 embodiment of the present invention of table and comparative example
As shown in table 1, tensile strength, yield strength and the derivative of magnesium alloy gear box casing provided in an embodiment of the present invention
Rate is superior to comparative example, shows that the preparation method of magnesium alloy gear box casing provided in an embodiment of the present invention can be improved effectively
The toughness and intensity of Mg alloy castings.
In conclusion the preparation method of magnesium alloy gear box casing provided in an embodiment of the present invention can effectively improve magnesium
The toughness and intensity of alloy-steel casting, improve its mechanical performance.It is provided in an embodiment of the present invention to use above-mentioned magnesium alloy transmission housing
The magnesium alloy gear box casing that the preparation method of body is prepared has the advantages of compression strength is high, good toughness.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of magnesium alloy gear box casing, which comprises the following steps:
Melting, refining magnesium alloys raw material obtain magnesium alloy, and the magnesium alloy is with following components by weight percentage: 8.2~
8.6%Al, 0.15~0.43%Mn, 0.51~0.78%Zn, 0.33~0.65%Re, 0.85~1.37%Ti, remaining is Mg
And inevitable impurity；
The magnesium alloy is poured into solidification, die-casting process in the mold of preheating and obtains casting；
The casting is heat-treated；The heat treatment is that the casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation,
It is taken out after being then cooled to 185~215 DEG C of 1.5~2.5h of heat preservation.
2. the preparation method of magnesium alloy gear box casing according to claim 1, which is characterized in that the cooling is by institute
It states casting and places natural cooling.
3. the preparation method of magnesium alloy gear box casing according to claim 1, which is characterized in that in the heat treatment,
When the casting is heated to 445~470 DEG C of 0.5~3.5h of heat preservation, the casting is heated to 445~455 DEG C of heat preservations first
0.5~1.5h is then heated to 460~470 DEG C of 2~3h of heat preservation.
4. the preparation method of magnesium alloy gear box casing according to claim 1, which is characterized in that in the heat treatment,
By the casting in 185~215 DEG C of 1.5~2.5h of heat preservation, first by the casting be cooled to 205~215 DEG C heat preservation 0.5~
1h is then cooled to 185~200 DEG C of 1~2h of heat preservation.
5. the preparation method of magnesium alloy gear box casing according to claim 1, which is characterized in that further include to the casting
Part carries out subzero treatment after being heat-treated, the subzero treatment is that the casting is cooled to -215~-185 DEG C of heat preservations 3.5
~5.5h.
6. the preparation method of magnesium alloy gear box casing according to claim 5, which is characterized in that the subzero treatment
When, the casting is cooled to -195~-185 DEG C of 1.5~2.5h of heat preservation first, is then cooled to -215~-205 DEG C of heat preservations 2
~3h.
7. the preparation method of magnesium alloy gear box casing according to claim 5, which is characterized in that carried out to the casting
Subzero treatment is carried out after the casting is placed 48~172h after heat treatment.
8. the preparation method of magnesium alloy gear box casing according to claim 5, which is characterized in that using liquid nitrogen to described
Casting carries out subzero treatment.
9. the preparation method of magnesium alloy gear box casing according to claim 1, which is characterized in that pour the magnesium alloy
Before building in the mold, the mold is preheated to 315~335 DEG C.
10. a kind of magnesium alloy gear box casing, which is characterized in that it is using magnesium as claimed in any one of claims 1-9 wherein
The preparation method of alloy gear box casing is prepared.
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| CN201810983431.2A CN109084008A (en) | 2018-08-27 | 2018-08-27 | Magnesium alloy gear box casing and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810983431.2A CN109084008A (en) | 2018-08-27 | 2018-08-27 | Magnesium alloy gear box casing and preparation method thereof |
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| CN201810983431.2A Pending CN109084008A (en) | 2018-08-27 | 2018-08-27 | Magnesium alloy gear box casing and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109622648A (en) * | 2019-01-10 | 2019-04-16 | 吉林大学 | A kind of asymmetric continuous large deformation extrusion forming method of magnesium alloy |
| CN109622649A (en) * | 2019-01-10 | 2019-04-16 | 吉林大学 | A kind of continuous variable section large deformation extrusion forming method of magnesium alloy |
| WO2021147397A1 (en) * | 2020-01-21 | 2021-07-29 | 中信戴卡股份有限公司 | Cast magnesium alloy and preparation method therefor |
Citations (5)
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| CN109622648A (en) * | 2019-01-10 | 2019-04-16 | 吉林大学 | A kind of asymmetric continuous large deformation extrusion forming method of magnesium alloy |
| CN109622649A (en) * | 2019-01-10 | 2019-04-16 | 吉林大学 | A kind of continuous variable section large deformation extrusion forming method of magnesium alloy |
| CN109622648B (en) * | 2019-01-10 | 2020-07-10 | 吉林大学 | Asymmetric continuous large-deformation extrusion forming method for magnesium alloy |
| WO2021147397A1 (en) * | 2020-01-21 | 2021-07-29 | 中信戴卡股份有限公司 | Cast magnesium alloy and preparation method therefor |
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