CN209830237U - Magnesium alloy casting device with cathode protection - Google Patents
Magnesium alloy casting device with cathode protection Download PDFInfo
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- CN209830237U CN209830237U CN201920585575.2U CN201920585575U CN209830237U CN 209830237 U CN209830237 U CN 209830237U CN 201920585575 U CN201920585575 U CN 201920585575U CN 209830237 U CN209830237 U CN 209830237U
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- magnesium alloy
- power supply
- adjustable power
- casting
- sand box
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Abstract
The utility model belongs to the technical field of magnesium alloy casting equipment, in particular to a casting device which is provided with cathode protection when the magnesium alloy is cast; the specific technical scheme is as follows: a magnesium alloy casting device with cathodic protection comprises an adjustable power supply, an upper sand box and a lower sand box which are arranged in an insulating layer, wherein a pouring gate and a riser are arranged on the upper sand box, the upper sand box covers the top of the lower sand box and forms a casting cavity, conductive ceramics communicated with the casting cavity are arranged on the lower sand box, the conductive ceramics are exposed and keep good conductive contact with magnesium alloy in the casting cavity, the conductive ceramics are arranged under the pouring gate and are connected with a negative terminal of the adjustable power supply through an armored cable, a positive terminal of the adjustable power supply is grounded, and in the magnesium alloy casting process, the potential of the adjustable power supply is adjusted to the corrosion potential of the magnesium alloy, so that the magnesium alloy is subjected to cathodic protection in the casting process, the oxidation reaction and hydrogen embrittlement of the magnesium metal are reduced, and the yield of the cast magnesium alloy is improved.
Description
Technical Field
The utility model belongs to the technical field of magnesium alloy casting equipment, concretely relates to dispose cathodic protection's casting device when magnesium alloy is cast.
Background
At present, the magnesium alloy casting process adopted at home and abroad adopts a flux protection method, a gas protection method and an alloying method.
Flux protection method: the compound with low melting point is melted into liquid at lower temperature and spread on the magnesium alloy liquid surface, thus playing a role of protection because the magnesium liquid is prevented from contacting with air. The flux commonly used at present is mainly composed of anhydrous carnallite (MgCI2-KC) and is added with some fluoride and chloride. The agent has the characteristics of convenient use, low production cost, good protection and use effects and suitability for production of medium and small enterprises. However, the agent should be dehydrated before use, and when used, it will release a choking smell. The flux is required to be added continuously because the flux gradually sinks due to the high density. A large amount of harmful gas is released in the using process, the environment is polluted, and the factory building is seriously corroded.
Gas protection method: covering a layer of inert gas or gas capable of reacting with magnesium to generate compact oxide film on the surface of magnesium alloy liquid to isolate oxygen in air, wherein the adopted main protective gas is SF6、S02、CO2、Ar、N2And the like. In order to further improve the protective action and to reduce the more expensive SF6The amount of gas used is generally SF abroad6The mixed gas has good protection effect on mixed air or other dry gases such as CO, but has the following problems:environmental pollution, SF6Will generate S02、SF4Iso-toxic gas, SF6The effect on global warming is CO224900 times of;the equipment is complex, and a complex gas mixing device and a sealing device are needed;corroding equipment and obviously reducing the service life of the crucible.
An alloying method: in the past, beryllium element is added into magnesium alloy to improve the flame retardant property of the magnesium alloy, but the toxicity of beryllium is high, and the addition of beryllium is limited by the addition amount because the beryllium element causes coarsening of crystal grains and increases the tendency of heat cracking. The studies of Japanese scholars suggest that the addition of a certain amount of calcium can obviously increase the ignition temperature of the magnesium alloy, but the addition amount is too high, and the mechanical properties of the magnesium alloy are seriously deteriorated. Meanwhile, the calcium and the zirconium are added, so that the flame retardant effect is achieved. Domestic research considers that the addition of rare earth cerium into the magnesium alloy AZ91D can effectively improve the ignition temperature of the magnesium alloy.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem existing in the prior art, the utility model provides a dispose cathodic protection's casting device has reduced the oxidation reaction and the hydrogen embrittlement phenomenon of magnesium metal, has improved the lumber recovery of casting magnesium alloy.
In order to achieve the above object, the utility model adopts the following technical scheme: a magnesium alloy casting device with cathode protection comprises an adjustable power supply, an upper sand box and a lower sand box which are arranged in an insulating layer, wherein a pouring gate and a dead head are arranged on the upper sand box, the upper sand box covers the top of the lower sand box and forms a casting cavity, conductive ceramics communicated with the casting cavity are arranged on the lower sand box, the conductive ceramics are exposed and keep good conductive contact with magnesium alloy in the casting cavity, the conductive ceramics are arranged under the pouring gate, the conductive ceramics are connected with a negative terminal of the adjustable power supply through an armored cable, and a positive terminal of the adjustable power supply is grounded. The potential of the adjustable power supply is adjusted to the corrosion potential of the magnesium alloy, so that the magnesium alloy is protected by a cathode during casting.
The adjustable power supply is disposed outside the insulating layer.
Compared with the prior art, the utility model, specifically beneficial effect is embodied in: in the process of casting and forming the aluminum alloy, the magnesium alloy is contacted with the conductive ceramic at the bottom of the pouring gate, the adjustable power supply adjusts and ensures that the voltage of the magnesium alloy casting is negative, the effect of cathodic protection is generated, the oxidation reaction and the hydrogen embrittlement of the magnesium metal are reduced, and the yield of the cast magnesium alloy is further improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1 is an adjustable power supply, 11 is a negative terminal, 12 is a positive terminal, 2 is an insulating layer, 3 is a cope flask, 31 is a pouring gate, 32 is a riser, 4 is a drag flask, 5 is a pouring cavity, 6 is conductive ceramic, 7 is an armored cable, and 8 is a magnesium alloy casting.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the magnesium alloy casting device with the cathodic protection comprises an adjustable power supply 1, a cope flask 3 and a drag flask 4 which are arranged in an insulating layer 2, wherein a pouring gate 31 and a dead head 32 are arranged on the cope flask 3, the cope flask 3 covers the top of the drag flask 4 and forms a casting cavity 5, conductive ceramics 6 communicated with the casting cavity 5 are arranged on the drag flask 4, the conductive ceramics 6 are exposed and keep good conductive contact with magnesium alloy in the casting cavity 5, the conductive ceramics 6 are arranged right below the pouring gate 31, the conductive ceramics 6 are connected with a negative terminal 11 of the adjustable power supply 1 through an armored cable 7, and a positive terminal 12 of the adjustable power supply 1 is grounded. The potential of the adjustable power supply 1 is adjusted to the corrosion potential of the magnesium alloy, so that the magnesium alloy is protected by a cathode during casting.
The adjustable power supply 1 is arranged outside the insulating layer 2.
The specific working process is as follows: before casting production, the adjustable power supply 1 is firstly turned on, the conductive ceramic 6 is controlled to be negative voltage through the adjustable power supply 1, casting solution is conducted with the conductive ceramic 6 to realize that the magnesium alloy casting 8 carries negative charge, a magnesium alloy casting device with cathode protection is formed, oxidation reaction and hydrogen embrittlement of magnesium metal are reduced, and the yield of cast magnesium alloy is further improved.
The foregoing is considered as illustrative and not restrictive of the preferred embodiments of the invention, and any modifications, equivalents and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (2)
1. The magnesium alloy casting device with the cathode protection function is characterized by comprising an adjustable power supply (1), a cope flask (3) and a drag flask (4) which are arranged in an insulating layer (2), wherein a pouring gate (31) and a dead head (32) are arranged on the cope flask (3), the cope flask (3) covers the top of the drag flask (4) to form a pouring cavity (5), conductive ceramics (6) communicated with the pouring cavity (5) are arranged on the drag flask (4), the conductive ceramics (6) are arranged under the pouring gate (31), the conductive ceramics (6) are connected with a negative terminal (11) of the adjustable power supply (1) through an armored cable (7), and a positive terminal (12) of the adjustable power supply (1) is grounded.
2. The magnesium alloy casting apparatus with cathodic protection as claimed in claim 1, characterized in that said adjustable power supply (1) is arranged outside the insulating layer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585575.2U CN209830237U (en) | 2019-04-26 | 2019-04-26 | Magnesium alloy casting device with cathode protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920585575.2U CN209830237U (en) | 2019-04-26 | 2019-04-26 | Magnesium alloy casting device with cathode protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209830237U true CN209830237U (en) | 2019-12-24 |
Family
ID=68914041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920585575.2U Expired - Fee Related CN209830237U (en) | 2019-04-26 | 2019-04-26 | Magnesium alloy casting device with cathode protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209830237U (en) |
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2019
- 2019-04-26 CN CN201920585575.2U patent/CN209830237U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |