CN116713439A - Method for solving shrinkage casting defects at interface of rim and spoke of magnesium alloy hub - Google Patents
Method for solving shrinkage casting defects at interface of rim and spoke of magnesium alloy hub Download PDFInfo
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- CN116713439A CN116713439A CN202310874318.1A CN202310874318A CN116713439A CN 116713439 A CN116713439 A CN 116713439A CN 202310874318 A CN202310874318 A CN 202310874318A CN 116713439 A CN116713439 A CN 116713439A
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- 238000005266 casting Methods 0.000 title claims abstract description 123
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 90
- 230000007547 defect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 230000005484 gravity Effects 0.000 claims abstract description 18
- 238000007796 conventional method Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims 1
- 229910000323 aluminium silicate Inorganic materials 0.000 claims 1
- 235000012211 aluminium silicate Nutrition 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 239000012774 insulation material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 238000005516 engineering process Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000003754 machining Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003031 feeding effect Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- -1 magnesium rare earth Chemical class 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 229910052688 Gadolinium Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A solution method for shrinkage casting defects at the interface of a rim and a spoke of a magnesium alloy hub comprises the following steps: 1) Preparing a magnesium alloy hub die, and preparing a metal die for low-pressure casting or gravity casting of the magnesium alloy hub according to a conventional method, wherein the metal die consists of a bottom die, a side die and an upper die; a self-feeding riser is arranged on the upper die and at the junction of the rim and the spoke, namely in the region corresponding to the hot joint, and a heat-insulating insert is arranged in the middle of the position of the upper die corresponding to the self-feeding riser; 2) Casting a magnesium alloy hub, and completing casting of a magnesium alloy melt after preheating a metal mold; 3) And opening the mould to take out the part, opening the mould after the magnesium alloy hub casting is completely solidified, and taking out the casting. The invention solves the industrial problem that the magnesium alloy hub is easy to form shrinkage defects such as shrinkage porosity/shrinkage cavity and the like at the junction (hot joint) of the rim and the spoke in the existing gravity casting and low-pressure casting, obviously improves the casting yield of the magnesium alloy hub, and realizes the mass production of the magnesium alloy automobile hub by gravity casting and low-pressure casting.
Description
Technical Field
The invention belongs to the technical field of metal casting molding, and particularly relates to a method for solving shrinkage casting defects at a rim/spoke juncture of a magnesium alloy automobile hub.
Background
As the lightest metal structural material, the magnesium alloy has the advantages of high specific strength, high specific rigidity, good shock absorption and the like, and is widely applied to the fields of aerospace, traffic, 3C and the like. Modern vehicles are evolving towards light weight in order to save energy, reduce consumption, reduce exhaust emission, improve driving comfort and vehicle dynamics; on a common car, the magnesium alloy automobile hub is adopted to replace the aluminum alloy automobile hub, so that the weight reduction effect of the whole car can be achieved by 10%, and the weight reduction effect is remarkable.
However, in actual production, magnesium alloy automobile hub forming technology is developed from early low-pressure casting technology to currently mainstream one-step extrusion forming (Lin Zhouding Xin DX & Henan Dewei DW) and forge spinning forming technology (general purpose automobile GM), and is not applied on a large scale, one of the main reasons is that the manufacturing cost of the two hub preparation technologies is still higher:
on one hand, the magnesium alloy automobile hub produced by adopting the conventional commercial magnesium alloy AZ91D and low-pressure casting technology has the defects that shrinkage porosity/shrinkage cavity, hot cracking and the like are very easy to generate at the rim/spoke juncture (hot joint), so that the magnesium alloy hub has low yield and obvious potential safety hazard, and cannot be produced in batches;
on the other hand, although the conventional commercial magnesium alloy AZ80 and the magnesium alloy automobile hub formed by one-time extrusion have no manufacturing defects and can meet the use requirements in performance, the material utilization rate is low (about 35 percent), the equipment depreciation and machining cost are high, so that the manufacturing cost of the magnesium alloy automobile hub is high, and the magnesium alloy automobile hub is unacceptable to common automobile manufacturers.
Therefore, the design and development of low-cost magnesium alloy hub manufacturing technology has become one of the key factors for mass application of magnesium alloy automobile hubs.
The magnesium alloy hub manufactured by adopting the conventional gravity casting and low-pressure casting molding technology is easy to form shrinkage casting defects such as shrinkage porosity/shrinkage cavity and the like at the rim/spoke juncture (hot joint), has low casting yield and obvious potential safety hazard, and is difficult to meet the service performance requirement.
The existing solutions for forming shrinkage porosity/shrinkage cavity and other casting defects at the rim/spoke juncture (hot spot) disclose low-pressure local extrusion schemes, such as those disclosed in Chinese patent application numbers CN202310082511.1, CN202310061993.2 and CN202310057984.6, and eliminate the casting defects at the hub rim/spoke juncture. However, these solutions require an additional addition of a local extrusion device above the hub central mounting plate or below the rim-spoke junction, and require modification of existing equipment, which significantly increases the equipment cost during implementation.
If the casting defect of the rim/spoke interface (hot joint) can be overcome by changing the die under the existing equipment condition, the manufacturing cost of the magnesium alloy hub and the popularization and application of the technology can be reduced more favorably.
Disclosure of Invention
The invention aims to provide a method for solving shrinkage casting defects at the rim/spoke junction of a magnesium alloy hub, which solves the industrial problems that the magnesium alloy hub is easy to form shrinkage porosity/shrinkage cavity and other shrinkage casting defects at the rim/spoke junction (hot joint) in the existing gravity casting and low-pressure casting, improves the casting yield of the magnesium alloy hub from 20% to 95%, realizes gravity casting and low-pressure casting mass production of magnesium alloy automobile hubs, and provides a low-cost manufacturing technology for the application of the magnesium alloy automobile hubs.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a solution method for shrinkage casting defects at the interface of a rim and a spoke of a magnesium alloy hub comprises the following steps:
1) Preparation magnesium alloy hub die
Preparing a metal mold for low-pressure casting or gravity casting of a magnesium alloy hub according to a conventional method, wherein the metal mold consists of a bottom mold, a side mold and an upper mold; different from the conventional method, a self-feeding head is arranged on the upper die and at the junction of the rim and the spoke, namely in the region corresponding to the hot joint, and a heat-insulating insert is arranged in the middle of the position of the upper die corresponding to the self-feeding head;
2) Casting of magnesium alloy hub
After the metal mold is preheated, casting the magnesium alloy melt according to a conventional low-pressure casting or gravity casting method;
3) Mould opening and taking piece
And opening the mould after the magnesium alloy hub casting is completely solidified, and taking out the casting.
Preferably, in the step 1), the self-feeding head has a meniscus-shaped cross section, and the thickness of the thickest part of the cross section is 20-40 mm.
Preferably, the heat-insulating insert is made of a nonmetallic heat-insulating material; preferably, the heat-insulating insert is made of aluminum silicate fibers.
Preferably, the diameter of the heat-insulating insert is 20-60 mm.
Preferably, in step 2), the preheating temperature of the metal mold is 200-400 ℃.
The solution method for the shrinkage casting defects at the interface of the rim and the spoke of the magnesium alloy hub comprises the following steps:
preparing a magnesium alloy hub die: preparing a metal mold for low-pressure casting or gravity casting of a magnesium alloy hub according to a conventional method, wherein the metal mold consists of a bottom mold, a side mold and an upper mold; unlike conventional metal mold, the self-feeding riser is set in the upper mold and corresponding to the rim/spoke junction, and the heat insulating insert is set in the position corresponding to the self-feeding riser. The heat-insulating insert has the function of reducing the cooling rate of the self-feeding riser and ensuring the final solidification of the self-feeding riser, thereby generating a feeding effect on the rim/spoke junction. Unlike conventional risers, the self-feeding riser described herein is formed by increasing the thickness of the casting at the rim/spoke interface, and by the lower solidification rate of the self-feeding riser, the shrinkage-type casting defects are transferred from the hub body into the self-feeding riser (for subsequent processing removal), achieving the technical effect of in-situ feeding of the casting. In the invention, the in-situ feeding is called self-feeding, and the increased wall thickness of the casting is called self-feeding riser.
The heat-insulating insert is made of a heat-insulating material with a low heat conductivity coefficient, such as aluminum silicate fiber, and the diameter of the heat-insulating insert is 20-60 mm. In the casting process, compared with a metal mold, the heat conduction coefficient of the heat-insulating insert is obviously reduced, so that the self-feeding dead head corresponding to the heat-insulating insert has the lowest solidification rate, and the shrinkage cavity/shrinkage cavity at the rim/spoke juncture is ensured to be transferred to the self-feeding dead head to form the shrinkage cavity.
The preheating temperature of the metal mold is 200-400 ℃, and the lower preheating temperature is more beneficial to shortening the casting period.
Compared with the existing magnesium alloy hub low-pressure casting or gravity casting, the invention has the following technical characteristics:
in the existing magnesium alloy hub low-pressure casting, the feeding of the rim/spoke interface mainly depends on the low-pressure feeding of the hub center; in gravity casting, the feeding at the rim/spoke junction mainly depends on the gravity feeding of a central riser of the hub; the feeding pressure of the two is smaller, and the two are matched with a higher bottom die temperature (more than or equal to 450 ℃), so that an ideal feeding effect is difficult to achieve, and shrinkage casting defects such as shrinkage porosity and shrinkage cavity still easily occur at the rim/spoke junction.
The self-feeding riser and the heat-insulating insert are arranged at the junction (hot joint) of the rim and the spoke, and the self-feeding riser is adopted to feed the junction of the rim and the spoke, so that shrinkage casting defects such as shrinkage porosity, shrinkage cavity and the like at the junction (hot joint) of the rim and the spoke can be effectively eliminated.
In the existing magnesium alloy hub low-pressure casting and gravity casting, even if a better feeding effect is achieved by increasing the temperature of a bottom die, the problem of shrinkage casting defects at the rim/spoke juncture is solved, and the microstructure at the spoke is seriously roughened due to the overhigh temperature (more than or equal to 450 ℃), so that the mechanical property of the spoke and the production efficiency of the hub are obviously reduced (the solidification time is longer and the production period of the hub is longer due to the overhigh temperature of the bottom die), and the magnesium alloy hub is a main reason that the magnesium alloy casting hub does not have mass production.
Compared with the prior art, the invention firstly provides the self-feeding riser for feeding the rim/spoke junction (hot joint), the method is simple (only the upper die needs to be modified), the shrinkage casting defect at the rim/spoke junction (hot joint) is overcome, and the microstructure at the spoke is not roughened due to overhigh bottom die temperature (more than or equal to 450 ℃), so that the mechanical property and the hub production efficiency at the hub spoke are reduced.
The invention solves the industrial problem that the existing gravity casting and low-pressure casting cannot realize mass production of the magnesium alloy automobile hub, improves the casting yield of the magnesium alloy automobile hub from 20% to 95%, realizes the mass production of the magnesium alloy automobile hub by gravity casting and low-pressure casting, and provides a low-cost manufacturing technology for the application of the magnesium alloy automobile hub.
Drawings
FIG. 1 is a schematic view of a magnesium alloy hub low-pressure casting die used in the present invention;
FIG. 2 is a graph showing shrinkage cavity distribution of a magnesium alloy hub during conventional low-pressure casting;
FIG. 3 is a schematic drawing of shrinkage cavity distribution at the rim/spoke interface of a magnesium alloy hub during low pressure casting using the method of the present invention;
FIG. 4 is a photograph of the surface topography of the rim/spoke interface of the cast magnesium alloy hub casting of example 1 of the present invention;
FIG. 5 is a photograph of the surface morphology of the magnesium alloy hub casting rim/spoke interface of example 1 of the present invention after machining;
FIG. 6 is a topography of the rim/spoke interface of a conventional low pressure cast Mg-1.7Nd-2.5Gd-0.12Zn-0.1La-0.4Zr magnesium alloy hub casting in comparative example 1.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
The 20 inch magnesium alloy hub casting is prepared by adopting the solution method of shrinkage casting defects at the junction of the rim and the spoke of the magnesium alloy hub, and the alloy is a high-strength casting magnesium rare earth alloy disclosed in China patent CN202210242706.3, and the alloy comprises the following components in percentage by weight: 1.4 to 2.0 percent of Nd,2.0 to 3.0 percent of Gd,0.04 to 0.20 percent of Zn,0.1 to 0.4 percent of La,0.3 to 0.7 percent of Zr and weight percent. The casting mold used is shown in fig. 1.
The method for solving the shrinkage casting defect at the junction of the rim and the spoke of the magnesium alloy hub comprises the following steps:
step 1) preparing a magnesium alloy hub die
Preparing a metal mold for low-pressure casting of a magnesium alloy hub according to a conventional method, wherein the metal mold consists of a bottom mold 1, a side mold 2 and an upper mold 3; as shown in fig. 1, unlike the conventional metal mold, a self-feeding riser 11 is arranged on the upper mold 3 in a region corresponding to the 9 (hot joint) of the rim 10/spoke 8 interface, a heat-insulating insert 12 is arranged on the upper mold 3 corresponding to the self-feeding riser 11, and the heat-insulating insert 12 is an aluminum silicate fiber block with the diameter of 30mm and the height of 30mm; in the figure, 4-hub casting/mold cavity; 5-in-gate; 6-upper wheel edge riser; 7-a hub center mounting plate;
step 2) casting of magnesium alloy hub
The whole die is preheated to 400 ℃ in an oven and then is arranged on a low-pressure casting machine, and the average temperature of the die before casting is 330 ℃; during pouring, the magnesium alloy melt at the temperature of 710 ℃ enters a die cavity from an inner gate in a low-pressure casting mode, the filling time is 15 seconds, and pressure is released after pressure is maintained for 60 seconds;
step 3) die opening and taking part
After the low pressure is relieved, the hub is cooled in the mold for 180 seconds, the mold is opened, and the casting is taken out.
The 20 inch Mg-1.7Nd-2.5Gd-0.12Zn-0.1La-0.4Zr magnesium alloy hub casting obtained by the method has obvious shrinkage cavity at the self-feeding head of the casting, as shown in figure 4.
After the self-feeding head is removed by machining, the structure of the rim/spoke juncture is compact, and no obvious shrinkage casting defects such as shrinkage porosity, shrinkage cavity and the like exist, as shown in fig. 5, and the hub quality is qualified.
Referring to FIG. 2, there is shown the shrinkage cavity distribution of a magnesium alloy hub during conventional low pressure casting, the shrinkage cavities being located on the casting body.
Referring to fig. 3, there is shown the shrinkage cavity distribution at the rim/spoke interface of a magnesium alloy hub during low pressure casting, the shrinkage cavity being located on the self-feeding head 11, and the shrinkage cavity being removable after machining. Wherein, 11-self feeding head; 12-a heat preservation insert; 13-shrinkage of the casting body; 14-self feeding head shrinkage cavity.
Example 2
The method for solving the shrinkage casting defect at the interface of the rim and the spoke of the magnesium alloy hub is used for preparing a 20-inch WE4 magnesium alloy hub casting, WE43 is a high-strength commercial casting magnesium rare earth alloy, the alloy composition range is as shown in WE43A, WE B in GB/T19078-2016 casting magnesium alloy ingot, and the alloy composition in the embodiment is 2.5% Nd, 4.0% Y, 1.0% Gd, 0.2% Zn and 0.45% Zr.
The molding process shown was substantially identical to example 1, except that the magnesium alloy melt temperature was 740 ℃ and the low pressure mold charge time was 12 seconds during casting.
The 20 inch WE4 magnesium alloy hub casting obtained by the method has obvious shrinkage cavity at the self-feeding head; however, after the self-feeding head is removed by machining, the structure of the rim/spoke juncture is compact, no obvious shrinkage casting defects such as shrinkage porosity, shrinkage cavity and the like exist, and the quality of the hub casting is qualified.
The embodiment aims to illustrate that the solution of the shrinkage casting defects at the junction of the rim and the spoke of the magnesium alloy wheel hub can eliminate the shrinkage casting defects at the junction of the rim and the spoke of the automobile wheel hub of different types of magnesium alloys, has universality and is not only suitable for single magnesium alloy.
Comparative example
The comparative example is a 20 inch Mg-1.7Nd-2.5Gd-0.12Zn-0.1La-0.4Zr magnesium alloy hub casting prepared by adopting a conventional low pressure casting method, and the alloy is a high strength and toughness cast magnesium rare earth alloy disclosed in Chinese patent application No. CN 202210242706.3.
The molding method shown is substantially identical to example 1, except that:
the corresponding position of the hot joint on the upper die is not provided with a self-feeding riser and a heat-insulating insert, namely, the self-feeding is not carried out on the rim/spoke junction (hot joint), and the rim/spoke junction (hot joint) is fed mainly by means of low pressure transmitted by an inner sprue.
The 20-inch magnesium alloy hub casting obtained by the method has obvious shrinkage at the rim/spoke interface (hot joint), as shown in fig. 6, and the quality of the hub casting is unqualified.
In summary, compared with the prior art, the solution of the shrinkage casting defect at the rim/spoke interface of the magnesium alloy hub can realize high-quality preparation of the magnesium alloy hub casting: by arranging the self-feeding riser and the heat-insulating insert, shrinkage casting defects such as shrinkage porosity and shrinkage cavity at the junction (hot joint) of the rim and the spoke can be effectively eliminated; the method has the advantages of simple technical measures, low implementation cost and obvious technical effect, can provide a low-cost manufacturing technology for the production of the magnesium alloy automobile hub, and solves the industrial problem that the existing gravity casting and low-pressure casting cannot be used for mass production of the magnesium alloy automobile hub.
There are many ways in which the invention may be practiced, and what has been described above is merely a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that modifications may be made without departing from the principles of the invention, and such modifications are intended to be within the scope of the invention.
Claims (6)
1. The method for solving the shrinkage casting defect at the junction of the rim and the spoke of the magnesium alloy hub is characterized by comprising the following steps:
1) Preparation magnesium alloy hub die
Preparing a metal mold for low-pressure casting or gravity casting of a magnesium alloy hub according to a conventional method, wherein the metal mold consists of a bottom mold, a side mold and an upper mold; a self-feeding riser is arranged on the upper die and at the junction of the rim and the spoke, namely in the region corresponding to the hot joint, and a heat-insulating insert is arranged in the middle of the position of the upper die corresponding to the self-feeding riser;
2) Casting of magnesium alloy hub
After the metal mold is preheated, casting the magnesium alloy melt according to a conventional low-pressure casting or gravity casting method;
3) Mould opening and taking piece
And opening the mould after the magnesium alloy hub casting is completely solidified, and taking out the casting.
2. The method for solving the shrinkage-type casting defect at the interface of a rim and a spoke of a magnesium alloy hub according to claim 1, wherein in the step 1), the self-feeding riser has a meniscus-shaped cross section, and the thickness of the thickest part of the cross section is 20-40 mm.
3. The method of solving shrinkage-type casting defects at a magnesium alloy hub rim/spoke interface according to claim 1 or 2, wherein in step 1), the insulation insert is made of a nonmetallic insulation material.
4. A solution to shrinkage-like casting defects at the rim/spoke interface of a magnesium alloy hub according to claim 1, 2 or 3, wherein in step 1) the insulating insert is made of aluminium silicate fibres.
5. The method for solving the shrinkage casting defects at the interface of the rim and the spoke of the magnesium alloy hub according to claim 1, 2, 3 or 4, wherein in the step 1), the diameter of the heat-insulating insert is 20-60 mm.
6. The method for solving shrinkage-type casting defects at a rim/spoke interface of a magnesium alloy hub according to claim 1, wherein in the step 2), the preheating temperature of the metal mold is 200-400 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310874318.1A CN116713439A (en) | 2023-07-17 | 2023-07-17 | Method for solving shrinkage casting defects at interface of rim and spoke of magnesium alloy hub |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310874318.1A CN116713439A (en) | 2023-07-17 | 2023-07-17 | Method for solving shrinkage casting defects at interface of rim and spoke of magnesium alloy hub |
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| CN116713439A true CN116713439A (en) | 2023-09-08 |
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| CN202310874318.1A Pending CN116713439A (en) | 2023-07-17 | 2023-07-17 | Method for solving shrinkage casting defects at interface of rim and spoke of magnesium alloy hub |
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| Country | Link |
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- 2023-07-17 CN CN202310874318.1A patent/CN116713439A/en active Pending
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