CN117733071A - Method for reducing metal liquid pollution in casting and forming process of high-reactivity metal - Google Patents
Method for reducing metal liquid pollution in casting and forming process of high-reactivity metal Download PDFInfo
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- CN117733071A CN117733071A CN202311772268.2A CN202311772268A CN117733071A CN 117733071 A CN117733071 A CN 117733071A CN 202311772268 A CN202311772268 A CN 202311772268A CN 117733071 A CN117733071 A CN 117733071A
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- 239000002184 metal Substances 0.000 title claims abstract description 74
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 74
- 238000005266 casting Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 title claims abstract description 17
- 238000011109 contamination Methods 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 3
- 230000009257 reactivity Effects 0.000 claims 2
- 238000000465 moulding Methods 0.000 abstract description 5
- 238000009736 wetting Methods 0.000 abstract description 5
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005429 filling process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Abstract
The invention discloses a method for reducing metal liquid pollution in a casting molding process of high-reactivity metal, and relates to a method for reducing metal liquid pollution in a casting molding process of high-reactivity metal. The invention aims to solve the problems that the existing method for reducing the pollution of molten metal has limited effect and increases the casting cost. The method for reducing the pollution of molten metal in the casting and forming process of the high-reactivity metal is to uniformly distribute and process micro grooves on the surface of a casting mould. The invention can reduce the contact area of molten metal and the casting surface in the filling process, and can avoid excessive heat dissipation of molten metal, thereby being beneficial to reducing pollution of molten metal and improving the filling capacity of molten metal. The proper groove shape is designed, so that the wetting of molten metal to the micro groove can be reduced, the waste of the molten metal is reduced, and the subsequent treatment of castings is also more convenient.
Description
Technical Field
The invention relates to a method for reducing metal liquid pollution in a casting molding process of high-reactivity metal.
Background
The high-reactivity metal such as titanium alloy is extremely easy to react with casting materials in the casting molding process, so that molten metal is polluted, and the quality of castings is greatly reduced; in the casting process of high-purity metal melt such as amorphous alloy, heterogeneous particles on the surface of a casting mold can be used as nucleation cores (heterogeneous nucleation) of molten metal, so that the forming capacity of the amorphous alloy is reduced, and the casting and forming of the amorphous alloy are not good. Conventionally, there have been mainly employed casting materials which improve the purity of molten metal or which are less contaminated with molten metal, but these measures only play a role in improving the contamination of molten metal and sometimes increase the casting cost of castings.
Disclosure of Invention
The invention provides a method for reducing molten metal pollution in the casting forming process of high-reactivity metal, which aims to solve the problems that the existing method for reducing molten metal pollution has limited effect and increases casting cost.
The method for reducing the metal liquid pollution in the casting and forming process of the high-reactivity metal is to uniformly distribute and process micro grooves on the surface of a casting mold.
The beneficial effects are that:
the casting surface design method for reducing the metal liquid pollution is characterized in that:
the design method is simple, the processing and manufacturing of the casting mould surface are convenient, the difficult problem that a proper casting mould material is difficult to find is further solved, and the processed casting mould can be used for multiple times. The contact area of molten metal and the casting surface in the filling process can be reduced, excessive heat dissipation of molten metal liquid can be avoided, so that pollution of the molten metal is reduced, and the filling capacity of the molten metal liquid is improved. The proper groove shape is designed, so that the wetting of molten metal to the micro groove can be reduced, the waste of the molten metal is reduced, and the subsequent treatment of castings is also more convenient.
Drawings
FIG. 1 is a schematic diagram of a rectangular micro-groove structure;
FIG. 2 is a schematic view of an isosceles trapezoid micro groove;
FIG. 3 is a schematic view of the structure of an isosceles triangle micro groove;
FIG. 4 is a schematic structural view of a semicircular micro groove;
FIG. 5 is a schematic diagram of a minor arc micro groove;
FIG. 6 is a plot of the wetting result phase field for different micro-groove shapes;
FIG. 7 is a plot of the wetting result phase field for grooves of different widths;
FIG. 8 is Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 Interface heat exchange coefficient contrast diagrams of the alloy under different micro-groove surface densities;
FIG. 9 is a graph of simulated temperature fields at different micro-groove areal densities.
Detailed Description
The first embodiment is as follows: the method for reducing the metal liquid pollution in the casting and forming process of the high-reactivity metal in the embodiment is to uniformly distribute and process micro grooves on the surface of a casting mold.
According to the embodiment, the surface structure of the casting mold is reasonably designed, and the grooves with certain surface density are processed on the surface of the casting mold, so that the contact area between molten metal and the surface of the casting mold in the mold filling process can be reduced, excessive heat dissipation of molten metal liquid can be avoided, pollution of the molten metal can be reduced, and the mold filling capability of the molten metal can be improved.
The second embodiment is as follows: the present embodiment differs from the first embodiment in that: the micro-groove is rectangular, isosceles triangle, isosceles trapezoid, semicircle or minor arc. The other is the same as in the first embodiment.
And a third specific embodiment: the present embodiment differs from the first embodiment in that: the width of the micro groove is 1-3 mm. The other is the same as in the first embodiment.
The specific embodiment IV is as follows: the present embodiment is different from the third embodiment in that: the width of the micro groove is 2mm. The other is the same as in the third embodiment.
Fifth embodiment: the present embodiment is different from the second embodiment in that: the micro groove is rectangular in shape, and the depth of the rectangle is 2mm and the width of the rectangle is 2mm. The other is the same as in the second embodiment.
Specific embodiment six: the present embodiment is different from the second embodiment in that: the shape of the micro groove is an isosceles triangle, and the depth of the isosceles triangle is 2mm. The other is the same as in the second embodiment.
Seventh embodiment: the present embodiment is different from the second embodiment in that: the shape of the micro groove is an isosceles trapezoid, the depth of the isosceles trapezoid is 2mm, and the bottom side length is 1mm. The other is the same as in the second embodiment. The others are the same as in one of the third to sixth embodiments.
Eighth embodiment: the present embodiment is different from the second embodiment in that: the shape of the micro groove is semicircular, and the diameter of the semicircle is 2mm. The other is the same as in the second embodiment.
Detailed description nine: the present embodiment is different from the second embodiment in that: the shape of the micro groove is in a minor arc shape, the bottom edge of the minor arc is 2mm, and the arch height is 0.5mm. The other is the same as in the second embodiment.
The beneficial effects of the invention are verified by the following examples:
examples: when amorphous alloy with a certain component is selected for filling type simulation analysis, as shown in fig. 5, it can be found that when the surface of the casting mold is a micro groove with a rectangular shape, the wettability of molten metal to the micro groove is poor, and the semicircular micro groove is filled with molten metal, so that the subsequent treatment of the casting is unfavorable, and more waste of molten metal is caused.
Thus, the shape of the micro grooves on the surface of the mold is processed into a rectangular shape, but the width of the micro grooves still needs to be considered. For this purpose,
three micro groove width (1 mm, 2mm and 3 mm) casting molds were designed, and the numerical simulation analysis results are shown in FIG. 6. It can be found that the length of the molten metal flowing into the groove is increased along with the increase of the width of the groove, which means that the molten metal wets the groove better and better, and if the width of the groove is large enough, the molten metal can completely wet the groove, namely the width of the micro groove designed on the surface of the casting mould is not too large. Meanwhile, for metals with different physical properties (viscosity, surface tension and the like), the proper width of the micro-grooves on the surface of the casting mold needs to be considered so as to ensure a small amount of wetting of the micro-grooves.
Because of the existence of the micro-grooves on the surface of the casting mold, when the grooves cannot be completely wetted by molten metal, air gaps are formed at the bottom, which can affect the interface heat exchange of the casting mold, so that the micro-groove surface density needs to be designed reasonably. Taking a rectangular groove with the size of 2mm multiplied by 2mm as an example, calculating the specific numerical change of the interface heat exchange coefficient of a certain amorphous alloy in a linear flow channel when the area densities (1/2, 1/3 and 1/5) of the different grooves are calculated by a method for calculating the average heat exchange coefficient through the contact area, and the specific numerical change is shown in figure 7. The linear fluidity test sample was simulated by ProCAST simulation software, the casting temperature of the amorphous alloy was 1200 ℃, the casting speed was 0.03m/s, the copper mold was not preheated, and the simulation result was shown in fig. 8. It can be found that the existence of the groove can indeed influence the flowing behavior of the molten metal by influencing the heat exchange coefficient, and when the width of the groove is unchanged, the length of the molten metal flowing forward in the stepped linear runner is obviously increased along with the increase of the surface density of the groove, so that the filling capacity of the molten metal is improved. However, the higher the areal density of the mold surface micro-grooves is not, the better, because the higher the areal density of the mold surface micro-grooves is, the less the heat dissipation of the molten metal is, which is disadvantageous for the cast molding of amorphous alloys, and some crystallization may occur in the cast.
Claims (9)
1. A method for reducing molten metal pollution in the casting and forming process of high-reactivity metal is characterized in that micro grooves are uniformly distributed and processed on the surface of a casting mould.
2. The method for reducing metal liquid pollution in casting process of high reactive metal according to claim 1, wherein the micro-grooves are rectangular, isosceles triangle, isosceles trapezoid, semicircle or minor arc.
3. The method for reducing metal liquid contamination during casting of highly reactive metal of claim 1, wherein the micro-grooves have a width of 1 to 3mm.
4. A method of reducing metal contamination during casting of highly reactive metals as recited in claim 3, wherein the micro grooves have a width of 2mm.
5. The method for reducing metal liquid contamination during casting of highly reactive metal of claim 2, wherein the micro-groove is rectangular in shape, the rectangle having a depth of 2mm and a width of 2mm.
6. The method for reducing metal liquid contamination during casting of highly reactive metal of claim 2, wherein the micro-grooves are in the shape of isosceles triangles having a depth of 2mm.
7. The method for reducing metal liquid pollution in the casting process of the metal with high reactivity according to claim 2, wherein the micro groove is in the shape of an isosceles trapezoid, the depth of the isosceles trapezoid is 2mm, and the bottom side length is 1mm.
8. A method of reducing metal contamination during casting of highly reactive metals as recited in claim 2, wherein the micro-grooves are semicircular in shape and 2mm in diameter.
9. The method for reducing metal liquid pollution in casting and forming a metal with high reactivity according to claim 2, wherein the micro-groove has a shape of a minor arc with a bottom edge of 2mm and a crown height of 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772268.2A CN117733071A (en) | 2023-12-21 | 2023-12-21 | Method for reducing metal liquid pollution in casting and forming process of high-reactivity metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772268.2A CN117733071A (en) | 2023-12-21 | 2023-12-21 | Method for reducing metal liquid pollution in casting and forming process of high-reactivity metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117733071A true CN117733071A (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311772268.2A Pending CN117733071A (en) | 2023-12-21 | 2023-12-21 | Method for reducing metal liquid pollution in casting and forming process of high-reactivity metal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117733071A (en) |
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2023
- 2023-12-21 CN CN202311772268.2A patent/CN117733071A/en active Pending
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