US20220062979A1 - Casting mold, counter-pressure casting method and low-pressure casting method - Google Patents
Casting mold, counter-pressure casting method and low-pressure casting method Download PDFInfo
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- US20220062979A1 US20220062979A1 US17/367,504 US202117367504A US2022062979A1 US 20220062979 A1 US20220062979 A1 US 20220062979A1 US 202117367504 A US202117367504 A US 202117367504A US 2022062979 A1 US2022062979 A1 US 2022062979A1
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- riser
- pressure
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- 238000005266 casting Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001125 extrusion Methods 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 238000007711 solidification Methods 0.000 claims description 11
- 230000008023 solidification Effects 0.000 claims description 11
- 238000013022 venting Methods 0.000 claims description 7
- 230000007547 defect Effects 0.000 abstract description 29
- 229910000838 Al alloy Inorganic materials 0.000 description 7
- 238000009751 slip forming Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000005429 filling process Methods 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- 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
-
- 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
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
-
- 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
- B22D18/08—Controlling, supervising, e.g. for safety reasons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/10—Repairing defective or damaged objects by metal casting procedures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
Definitions
- the present application relates to the technical field of casting, in particular to a casting mold, a counter-pressure casting method and a low-pressure casting method.
- the casting structure is complicated, the shape is special, a larger number of iron castings are replaced by aluminum alloy, and the casting shape is complex.
- Casting defects are the primary process problem brought by the complex shape.
- the main method to solve the casting defects is to optimize the product shape, so that the castings may be sequentially solidified, and the product weight will be increased, which is contrary to the development trend of the lightweight and energy saving.
- the casting defects may be eliminated through riser feeding, but only casting defects near the riser can be solved by using a riser, and the defects far away from the riser cannot be eliminated, which requires a new breakthrough in the process.
- An embodiment of the present application provides a casting mold, a counter-pressure casting method and a low-pressure casting method.
- the pressure of a riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- a casting mold in a first aspect, includes an upper mold and a lower mold, wherein a mold cavity is formed by enclosing of the upper mold and the lower mold, an upper mold insert is arranged on the upper mold, a riser cavity is formed in a lower part of the upper mold insert, and the riser cavity communicates with the mold cavity; and an air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at a top of the riser cavity, so that compressed air can be introduced.
- a venting plug is arranged between the riser cavity and the air pipe.
- a check valve is disposed on the air pipe.
- a cross section of the riser cavity is in a shape of cone with a narrow upper part and a wide lower part.
- an embodiment of the present application provides a counter-pressure casting method of the casting mold as defined in any one of the above embodiments.
- the counter-pressure casting method of the casting mold includes the following steps:
- an embodiment of the present application provides a low-pressure casting method of the casting mold as defined in any one of the above embodiments.
- the low-pressure casting method of the casting mold includes the following steps:
- pressurization is performed in the heat-insulating furnace at a speed of 4 mbar/s-30 mbar/s according to a set pressure curve, and the mold cavity is slowly filled with molten aluminum in the heat-insulating furnace;
- the casting mold includes the upper mold insert arranged on the upper mold, wherein the riser cavity is formed in the lower part of the upper mold insert, the riser cavity communicates with the mold cavity, the air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at the top of the riser cavity, and compressed air can be introduced.
- the compressed air is introduced into the air pipe in the casting process, so that the upper part of the riser cavity forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, the extrusion effect is continuously formed on the riser in the solidification process of the casting, and the pressure of the riser is transmitted to the far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- FIG. 1 is a structural schematic diagram of a mold closing state of a casting mold according to the present application.
- an embodiment of the present application provides a casting mold, including an upper mold and a lower mold, wherein a mold cavity is formed by enclosing of the upper mold and the lower mold, an upper mold insert is arranged on the upper mold, a riser cavity is formed in a lower part of the upper mold insert, and the riser cavity communicates with the mold cavity; and an air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at a top of the riser cavity, and compressed air can be introduced.
- compressed air is introduced into the air pipe in the casting process, so that an upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in a heat-insulating furnace, an extrusion effect is continuously formed on a riser in the solidification process of a casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- a venting plug is arranged between the riser cavity and the air pipe, thereby preventing molten aluminum from entering a pipeline of the air pipe during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion.
- a check valve is arranged on the air pipe, so that the air pipe is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the riser cavity.
- a cross section of the riser cavity is in a shape of cone with a narrow upper part and a wide lower part, and the conical riser is beneficial to formation of an ideal contracted pipe in the riser, so that the feeding efficiency of the riser is improved and a good casting is obtained.
- the embodiment 1 provides a casting mold, as shown in FIG. 1 , including an upper mold 1 and a lower mold 2 , wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and the lower mold 2 .
- An upper mold insert 3 is arranged on the upper mold 1 , a riser cavity 5 is formed in a lower part of the upper mold insert 3 , and the riser cavity 5 communicates with the mold cavity 4 .
- a cross section of the riser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part.
- An air pipe 6 communicating with the riser cavity 5 is arranged on the upper mold insert 3 , one end of the air pipe 6 is located at a top of the riser cavity 5 , and compressed air can be introduced.
- the other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line.
- a venting plug 7 is arranged between the riser cavity 5 and the air pipe 6 , thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion.
- a check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe 6 is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the riser cavity 5 .
- the casting mold is provided. Compressed air is introduced into the air pipe 6 in the casting process, so that the upper part of the riser cavity 5 forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace, an extrusion effect is continuously formed on the riser in the solidification process of a casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser.
- the present application is simple in structure and convenient to operate, and may eliminate the casting defect that the common riser cannot be eliminated; and meanwhile, the casting is crystallized under the local pressure, the internal structure performance of the casting can be enhanced, the production quality can be improved, and a method is provided for breakthrough of the counter-pressure casting process.
- the embodiment 2 provides a counter-pressure casting mold, as shown in FIG. 1 , including an upper mold 1 and a lower mold 2 , wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and the lower mold 2 .
- An upper mold insert 3 is arranged on the upper mold 1 , a riser cavity 5 is formed in a lower part of the upper mold insert 3 , and the riser cavity 5 communicates with the mold cavity 4 .
- a cross section of the riser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part.
- An air pipe 6 communicating with the riser cavity 5 is arranged on the upper mold insert 3 , one end of the air pipe 6 is located at a top of the riser cavity 5 , and compressed air can be introduced.
- the other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line.
- a venting plug 7 is arranged between the riser cavity 5 and the air pipe 6 , thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion.
- a check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe 6 is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the riser cavity 5 .
- a counter-pressure casting method of the counter-pressure casting mold is as follows:
- casting aluminum alloy for example, ZL101 and A356 aluminum alloy
- the casting aluminum alloy is molten, and molten aluminum is placed into a heat-insulating furnace of a casting machine and is poured at the temperature of 700-730° C.
- dry compressed air is introduced into the heat-insulating furnace and the mold cavity, the pressure is increased to 0.2-0.6 MPa, then the mold cavity stops being pressurized and maintains the pressure, pressurization continues to be performed in the heat-insulating furnace at a speed of 4 mbar/s-20 mbar/s according to a set pressure curve, and slowly fill the metal casting mold cavity with the molten aluminum in the heat-insulating furnace; compressed air is introduced into the air pipe, so that the upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace (to avoid danger caused by too high pressure or non-obvious extrusion effect caused by too low pressure) to form an extrusion effect
- the counter-pressure casting mold and the counter-pressure casting method are provided. Air pressure introduced above the riser is started in the casting process, compressed air is introduced into the air pipe 6 , so that the upper part of the riser cavity 5 forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, and the extrusion effect is continuously formed on the riser in the solidification process of the casting, the pressure of the riser is transmitted to the far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser.
- the embodiment 3 provides a low-pressure casting mold, as shown in FIG. 1 , including an upper mold 1 and a lower mold 2 , wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and the lower mold 2 .
- An upper mold insert 3 is arranged on the upper mold 1 , a riser cavity 5 is formed in a lower part of the upper mold insert 3 , and the riser cavity 5 communicates with the mold cavity 4 .
- a cross section of the riser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part.
- An air pipe 6 communicating with the riser cavity 5 is arranged on the upper mold insert 3 , one end of the air pipe 6 is located at a top of the riser cavity 5 , and compressed air can be introduced.
- the other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line.
- a venting plug 7 is arranged between the riser cavity 5 and the air pipe 6 , thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion.
- a check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the riser cavity 5 .
- a low-pressure casting method of the low-pressure casting mold is as follows:
- casting aluminum alloy for example, ZL101 and A356 aluminum alloy
- the casting aluminum alloy is molten, molten aluminum is placed into a heat-insulating furnace of a casting machine and is poured at the temperature of 680-750° C.
- pressure in the heat-insulating furnace is increased at the speed of 4 mbar/s-30 mbar/s according to a set pressure curve (the pressurizing speed may be changed in the liquid lifting stage and the mold filling stage, for example, the speed is controlled to be 15 mbar/s-30 mbar/s in the liquid lifting stage and is controlled to be 4 mbar/s-15 mbar/s in the mold filling stage), and a metal casting mold cavity is slowly filled with the molten aluminum in the heat-insulating furnace; compressed air is introduced into the air pipe, so that an upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace (to avoid danger caused by too high pressure
- the low-pressure casting mold and the low-pressure casting method are provided. Air pressure introduced above the riser is started in the casting process, and compressed air is introduced into the air pipe 6 , so that the upper part of the riser cavity 5 forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, the extrusion effect is continuously formed on the riser in the solidification process of the casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser.
Abstract
Description
- The present application relates to the technical field of casting, in particular to a casting mold, a counter-pressure casting method and a low-pressure casting method.
- In the development process of modern automobiles, lightweight and energy saving are an important trend, a great difficulty is brought to the process as the casting structure is complicated, the shape is special, a larger number of iron castings are replaced by aluminum alloy, and the casting shape is complex. Casting defects are the primary process problem brought by the complex shape. At present, the main method to solve the casting defects is to optimize the product shape, so that the castings may be sequentially solidified, and the product weight will be increased, which is contrary to the development trend of the lightweight and energy saving. In addition, the casting defects may be eliminated through riser feeding, but only casting defects near the riser can be solved by using a riser, and the defects far away from the riser cannot be eliminated, which requires a new breakthrough in the process.
- An embodiment of the present application provides a casting mold, a counter-pressure casting method and a low-pressure casting method. The pressure of a riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- To achieve the above objectives, the present application provides the following technical solution:
- in a first aspect, a casting mold is provided, and includes an upper mold and a lower mold, wherein a mold cavity is formed by enclosing of the upper mold and the lower mold, an upper mold insert is arranged on the upper mold, a riser cavity is formed in a lower part of the upper mold insert, and the riser cavity communicates with the mold cavity; and an air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at a top of the riser cavity, so that compressed air can be introduced.
- In some embodiments, a venting plug is arranged between the riser cavity and the air pipe.
- In some embodiments, a check valve is disposed on the air pipe.
- In some embodiments, a cross section of the riser cavity is in a shape of cone with a narrow upper part and a wide lower part.
- In a second aspect, an embodiment of the present application provides a counter-pressure casting method of the casting mold as defined in any one of the above embodiments. The counter-pressure casting method of the casting mold includes the following steps:
- after the mold is closed, dry compressed air is introduced into a heat-insulating furnace and the mold cavity, pressure is increased to 0.2-0.6 MPa, then the mold cavity stops being pressurized and maintains the pressure, pressurization continues to be performed in the heat-insulating furnace at a speed of 4 mbar/s-20 mbar/s according to a set pressure curve, and the mold cavity is slowly filled with molten aluminum in the heat-insulating furnace; and
- compressed air is introduced into the air pipe, the upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace, and an extrusion effect is continuously formed on a riser in the solidification process of a casting.
- In a third aspect, an embodiment of the present application provides a low-pressure casting method of the casting mold as defined in any one of the above embodiments. The low-pressure casting method of the casting mold includes the following steps:
- after the mold is closed, pressurization is performed in the heat-insulating furnace at a speed of 4 mbar/s-30 mbar/s according to a set pressure curve, and the mold cavity is slowly filled with molten aluminum in the heat-insulating furnace; and
- compressed air is introduced into the air pipe, the upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace, and an extrusion effect is continuously formed on a riser in the solidification process of a casting.
- Compared with the prior art, the present application has the following beneficial effects:
- the present application provides the casting mold, the counter-pressure casting method and the low-pressure casting method. The casting mold includes the upper mold insert arranged on the upper mold, wherein the riser cavity is formed in the lower part of the upper mold insert, the riser cavity communicates with the mold cavity, the air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at the top of the riser cavity, and compressed air can be introduced. The compressed air is introduced into the air pipe in the casting process, so that the upper part of the riser cavity forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, the extrusion effect is continuously formed on the riser in the solidification process of the casting, and the pressure of the riser is transmitted to the far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
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FIG. 1 is a structural schematic diagram of a mold closing state of a casting mold according to the present application. - In the drawings: 1—upper mold, 2—lower mold, 3—upper mold insert, 4—mold cavity, 5—riser cavity, 6—air pipe, 7—venting plug, 8—check valve, 9—flow dividing cone.
- In order to solve the casting defects such as shrinkage porosity and shrinkage cavity far away from a riser, an embodiment of the present application provides a casting mold, including an upper mold and a lower mold, wherein a mold cavity is formed by enclosing of the upper mold and the lower mold, an upper mold insert is arranged on the upper mold, a riser cavity is formed in a lower part of the upper mold insert, and the riser cavity communicates with the mold cavity; and an air pipe communicating with the riser cavity is arranged on the upper mold insert, one end of the air pipe is located at a top of the riser cavity, and compressed air can be introduced. In the embodiment, compressed air is introduced into the air pipe in the casting process, so that an upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in a heat-insulating furnace, an extrusion effect is continuously formed on a riser in the solidification process of a casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect.
- In some other embodiments, a venting plug is arranged between the riser cavity and the air pipe, thereby preventing molten aluminum from entering a pipeline of the air pipe during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion.
- In some other embodiments, a check valve is arranged on the air pipe, so that the air pipe is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the riser cavity.
- In some other embodiments, a cross section of the riser cavity is in a shape of cone with a narrow upper part and a wide lower part, and the conical riser is beneficial to formation of an ideal contracted pipe in the riser, so that the feeding efficiency of the riser is improved and a good casting is obtained.
- The technical solutions of the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. Apparently, the described embodiments are some but not all embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts should fall within the protection scope of the present application.
- The embodiment 1 provides a casting mold, as shown in
FIG. 1 , including an upper mold 1 and alower mold 2, wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and thelower mold 2. An upper mold insert 3 is arranged on the upper mold 1, ariser cavity 5 is formed in a lower part of the upper mold insert 3, and theriser cavity 5 communicates with the mold cavity 4. A cross section of theriser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part. - An air pipe 6 communicating with the
riser cavity 5 is arranged on the upper mold insert 3, one end of the air pipe 6 is located at a top of theriser cavity 5, and compressed air can be introduced. The other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line. - A venting plug 7 is arranged between the
riser cavity 5 and the air pipe 6, thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion. - A check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe 6 is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the
riser cavity 5. - In the embodiment 1, the casting mold is provided. Compressed air is introduced into the air pipe 6 in the casting process, so that the upper part of the
riser cavity 5 forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace, an extrusion effect is continuously formed on the riser in the solidification process of a casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect. After verification, the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser. - The present application is simple in structure and convenient to operate, and may eliminate the casting defect that the common riser cannot be eliminated; and meanwhile, the casting is crystallized under the local pressure, the internal structure performance of the casting can be enhanced, the production quality can be improved, and a method is provided for breakthrough of the counter-pressure casting process.
- The
embodiment 2 provides a counter-pressure casting mold, as shown inFIG. 1 , including an upper mold 1 and alower mold 2, wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and thelower mold 2. An upper mold insert 3 is arranged on the upper mold 1, ariser cavity 5 is formed in a lower part of the upper mold insert 3, and theriser cavity 5 communicates with the mold cavity 4. A cross section of theriser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part. - An air pipe 6 communicating with the
riser cavity 5 is arranged on the upper mold insert 3, one end of the air pipe 6 is located at a top of theriser cavity 5, and compressed air can be introduced. The other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line. - A venting plug 7 is arranged between the
riser cavity 5 and the air pipe 6, thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion. - A check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe 6 is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the
riser cavity 5. - A counter-pressure casting method of the counter-pressure casting mold is as follows:
- casting aluminum alloy (for example, ZL101 and A356 aluminum alloy) is provided; the casting aluminum alloy is molten, and molten aluminum is placed into a heat-insulating furnace of a casting machine and is poured at the temperature of 700-730° C.; after the mold of the casting machine is closed, dry compressed air is introduced into the heat-insulating furnace and the mold cavity, the pressure is increased to 0.2-0.6 MPa, then the mold cavity stops being pressurized and maintains the pressure, pressurization continues to be performed in the heat-insulating furnace at a speed of 4 mbar/s-20 mbar/s according to a set pressure curve, and slowly fill the metal casting mold cavity with the molten aluminum in the heat-insulating furnace; compressed air is introduced into the air pipe, so that the upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace (to avoid danger caused by too high pressure or non-obvious extrusion effect caused by too low pressure) to form an extrusion effect on the riser in the solidification process of the casting; after mold filling is completed, each branch cooling water path in a mold core is opened to cool the mold and the pressure of the heat-insulating furnace is maintained; the pressure above the riser is relieved, and the pipeline of the air pipe is rapidly cut off from the mold cavity to ensure the cavity sealing effect in the mold cavity, and then the pressure in the mold cavity and the heat-insulating furnace is relieved; and the mold is opened, and the casting is taken out and then is rapidly soaked into water with the temperature of 30-45° C. for cooling to complete the counter-pressure casting production.
- In the
embodiment 2, the counter-pressure casting mold and the counter-pressure casting method are provided. Air pressure introduced above the riser is started in the casting process, compressed air is introduced into the air pipe 6, so that the upper part of theriser cavity 5 forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, and the extrusion effect is continuously formed on the riser in the solidification process of the casting, the pressure of the riser is transmitted to the far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect. After verification, the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser. - The embodiment 3 provides a low-pressure casting mold, as shown in
FIG. 1 , including an upper mold 1 and alower mold 2, wherein a mold cavity 4 is formed by enclosing of the upper mold 1 and thelower mold 2. An upper mold insert 3 is arranged on the upper mold 1, ariser cavity 5 is formed in a lower part of the upper mold insert 3, and theriser cavity 5 communicates with the mold cavity 4. A cross section of theriser cavity 5 is in a shape of cone with a narrow upper part and a wide lower part. - An air pipe 6 communicating with the
riser cavity 5 is arranged on the upper mold insert 3, one end of the air pipe 6 is located at a top of theriser cavity 5, and compressed air can be introduced. The other end of the air pipe 6 may be connected to air pressurizing equipment, for example an air pump, an air compressor or a compressed air station on a production line. - A venting plug 7 is arranged between the
riser cavity 5 and the air pipe 6, thereby preventing molten aluminum from entering a pipeline of the air pipe 6 during mold filling to avoid blocking the pipeline so as to avoid ineffective extrusion. - A check valve is arranged at a position, being 200 mm away from the riser, of the air pipe, so that the extrusion pipeline of the air pipe is further prevented from being blocked by the molten aluminum in the mold filling process, and extruded air can be ensured to successfully enter the
riser cavity 5. - A low-pressure casting method of the low-pressure casting mold is as follows:
- casting aluminum alloy (for example, ZL101 and A356 aluminum alloy) is provided; the casting aluminum alloy is molten, molten aluminum is placed into a heat-insulating furnace of a casting machine and is poured at the temperature of 680-750° C.; after the mold of the casting machine is closed, pressure in the heat-insulating furnace is increased at the speed of 4 mbar/s-30 mbar/s according to a set pressure curve (the pressurizing speed may be changed in the liquid lifting stage and the mold filling stage, for example, the speed is controlled to be 15 mbar/s-30 mbar/s in the liquid lifting stage and is controlled to be 4 mbar/s-15 mbar/s in the mold filling stage), and a metal casting mold cavity is slowly filled with the molten aluminum in the heat-insulating furnace; compressed air is introduced into the air pipe, so that an upper part of the riser cavity forms a pressure with the same order of magnitude as a mold-filling pressure in the heat-insulating furnace (to avoid danger caused by too high pressure or non-obvious extrusion effect caused by too low pressure) to form an extrusion effect on the riser in the solidification process of the casting; after mold filling is completed, each branch cooling water path in a mold core is opened to cool the mold and the pressure of the heat-insulating furnace is maintained; the pressure of the pipeline of the air pipe above the riser is relieved and then the pressure in the heat-insulating furnace is relieved; and the mold is opened, the casting is taken out, and subsequent heat treatment, machining, coating and other processes are conducted to complete low-pressure casting.
- In the embodiment 3, the low-pressure casting mold and the low-pressure casting method are provided. Air pressure introduced above the riser is started in the casting process, and compressed air is introduced into the air pipe 6, so that the upper part of the
riser cavity 5 forms the pressure with the same order of magnitude as the mold-filling pressure in the heat-insulating furnace, the extrusion effect is continuously formed on the riser in the solidification process of the casting, and the pressure of the riser is transmitted to a far-end defect position through local extrusion, thereby achieving the purpose of feeding the defect position to eliminate the defect. After verification, the present application may produce an obvious inhibition effect on the defects within 100 mm around the riser.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN202010893570.3A CN111940702A (en) | 2020-08-31 | 2020-08-31 | Casting mold, counter-pressure casting method and low-pressure casting method |
CN2020108935703 | 2020-08-31 |
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US20220062979A1 true US20220062979A1 (en) | 2022-03-03 |
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US17/367,504 Abandoned US20220062979A1 (en) | 2020-08-31 | 2021-07-05 | Casting mold, counter-pressure casting method and low-pressure casting method |
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US (1) | US20220062979A1 (en) |
EP (1) | EP3960330A1 (en) |
KR (1) | KR20220029409A (en) |
CN (1) | CN111940702A (en) |
MA (1) | MA54897A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115301898A (en) * | 2022-09-02 | 2022-11-08 | 中国航发沈阳发动机研究所 | Casing support plate filling design method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112620589B (en) * | 2020-12-18 | 2023-02-21 | 陕西法士特汽车传动集团有限责任公司 | Riser bush and casting method based on riser bush |
CN115846633B (en) * | 2023-02-11 | 2023-05-16 | 中信戴卡股份有限公司 | Casting floating grabbing and net placing device and differential pressure casting machine |
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JPH0724563A (en) * | 1993-07-09 | 1995-01-27 | Toyota Motor Corp | Apparatus and method for vacuum casting |
JP5319893B2 (en) * | 2007-03-06 | 2013-10-16 | アイ・イー・ソリューション株式会社 | High vacuum suction casting equipment |
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2020
- 2020-08-31 CN CN202010893570.3A patent/CN111940702A/en active Pending
-
2021
- 2021-07-05 US US17/367,504 patent/US20220062979A1/en not_active Abandoned
- 2021-08-17 MA MA054897A patent/MA54897A/en unknown
- 2021-08-17 EP EP21191812.3A patent/EP3960330A1/en active Pending
- 2021-08-20 KR KR1020210110322A patent/KR20220029409A/en not_active Application Discontinuation
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US2406333A (en) * | 1943-10-20 | 1946-08-27 | Emil O Jensen | Machine for applying pneumatic pressure to cast metals |
US2568428A (en) * | 1949-09-09 | 1951-09-18 | Irvin A Billiar | Mold with riser and exothermic insert |
US3226785A (en) * | 1964-03-20 | 1966-01-04 | George S Moxlow | Metal casting process using destructible pattern |
US3380509A (en) * | 1964-08-17 | 1968-04-30 | Suedwestfalen Ag Stahlwerke | Method of pressure treatment of metallic melts, especially steel melts |
US3566952A (en) * | 1967-10-26 | 1971-03-02 | Wyman Curtis Lane | Pressure feeding of casting using a feeder head |
US5896912A (en) * | 1995-04-27 | 1999-04-27 | Hayes Wheels International, Inc. | Method and apparatus for casting a vehicle wheel in a pressurized mold |
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CN115301898A (en) * | 2022-09-02 | 2022-11-08 | 中国航发沈阳发动机研究所 | Casing support plate filling design method |
Also Published As
Publication number | Publication date |
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EP3960330A1 (en) | 2022-03-02 |
MA54897A (en) | 2022-03-02 |
CN111940702A (en) | 2020-11-17 |
KR20220029409A (en) | 2022-03-08 |
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