CN114029450A - Light alloy casting embedded pipeline assembly and preparation method thereof and casting method of light alloy part with embedded pipeline - Google Patents
Light alloy casting embedded pipeline assembly and preparation method thereof and casting method of light alloy part with embedded pipeline Download PDFInfo
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- CN114029450A CN114029450A CN202111329222.4A CN202111329222A CN114029450A CN 114029450 A CN114029450 A CN 114029450A CN 202111329222 A CN202111329222 A CN 202111329222A CN 114029450 A CN114029450 A CN 114029450A
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- 238000005266 casting Methods 0.000 title claims abstract description 114
- 229910001234 light alloy Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 143
- 239000002184 metal Substances 0.000 claims abstract description 143
- 238000010438 heat treatment Methods 0.000 claims abstract description 94
- 229910052602 gypsum Inorganic materials 0.000 claims description 64
- 239000010440 gypsum Substances 0.000 claims description 64
- 239000010935 stainless steel Substances 0.000 claims description 35
- 229910001220 stainless steel Inorganic materials 0.000 claims description 35
- 239000004576 sand Substances 0.000 claims description 24
- 239000002002 slurry Substances 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000002844 melting Methods 0.000 description 17
- 230000008018 melting Effects 0.000 description 17
- 229910000838 Al alloy Inorganic materials 0.000 description 11
- 238000004321 preservation Methods 0.000 description 10
- 238000007528 sand casting Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
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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
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- 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
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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Abstract
The invention relates to a light alloy casting embedded pipeline assembly, a preparation method thereof and a casting method of a light alloy part with an embedded pipeline, belongs to the technical field of light alloy casting, and solves the problems that the safety of heating operation of the embedded pipeline is poor and the temperature of the pipeline cannot be accurately controlled in the casting process in the prior art. The light alloy casting embedded pipeline component comprises a metal pipeline, and a heat-insulating part, a heating element and an overload protection element which are arranged in the metal pipeline; the heating element is fixed in the metal pipeline through a heat-insulating part; the overload protection element is arranged in a heating circuit of the heating element, and when the heating temperature reaches the required temperature, the overload protection element works and the heating element stops heating. The effect of safely and accurately controlling the temperature of the pipeline is realized.
Description
Technical Field
The invention relates to the technical field of light alloy casting, in particular to a light alloy casting embedded pipeline assembly and a preparation method thereof and a casting method of a light alloy part with an embedded pipeline.
Background
Due to process requirements, the application of casting pipelines in light alloy castings is increasing, and the shapes of the casting pipelines are also more complicated. In the casting production of the existing pipeline-containing casting, the pipeline forming process is generally divided into various forming modes such as sand core forming, metal pipeline insert casting and then corrosion forming, direct insert casting forming and the like. For the direct insert casting molding of the pipeline, in order to ensure the binding force between the metal pipeline and the casting and prevent the interface separation between different metals, the metal pipeline must be ensured to have high enough temperature in the pouring process. Therefore, the metal pipe must be heat treated before or during casting.
Generally, the pipeline heating process is divided into modes of heating a metal pipeline after being formed into a group and a casting mold together, heating the metal pipeline separately and then forming the metal pipeline again, heating the metal pipeline separately after being formed into a group, and the like. However, after the metal pipeline and the casting mold are heated together, and the metal pipeline is heated alone, the metal pipeline and the casting mold are assembled again, so that the requirement of the metal pipeline on high enough temperature cannot be met, and the temperature cannot be accurately controlled. The whole process of realizing the pipeline temperature control by adopting the pipeline independent current heating technology at the present stage needs manual operation, the uniformity of the pipeline temperature and the control accuracy of the pipeline temperature are difficult to ensure, and great potential safety hazards exist.
Disclosure of Invention
In view of the foregoing analysis, embodiments of the present invention are directed to a light alloy cast embedded pipeline assembly, a method for manufacturing the same, and a method for casting a light alloy part with an embedded pipeline, so as to solve the problems of poor safety of a pipeline heating operation and incapability of accurately controlling a pipeline temperature in the existing casting process.
In one aspect, an embodiment of the present invention provides a light alloy cast-in-line pipeline assembly, where the light alloy cast-in-line pipeline assembly includes a metal pipeline, and a thermal insulation member, a heating element, and an overload protection element that are disposed in the metal pipeline;
the heating element is fixed in the metal pipeline through a heat-insulating part; the overload protection element is arranged in a heating circuit of the heating element, and when the heating temperature reaches the required temperature, the overload protection element works and the heating element stops heating.
Based on the further improvement of the light alloy cast embedded pipeline component, the heating elements are resistance wires, the number of the resistance wires is more than two, and the resistance wires penetrate through the metal pipeline;
the overload protection element is a metal block, and after the metal block is melted, the resistance wire is powered off, and heating is stopped;
the heat-insulation insulating part is a gypsum core, the resistance wires are embedded and fixed in the gypsum core, and the gypsum core is filled in the metal pipeline and separates the resistance wires.
Preferably, the number of the resistance wires is 2, and both ends of the resistance wires exceed both ends of the metal pipeline by at least 20 mm.
Preferably, one end of the resistance wire is connected with the metal block, and the other end of the resistance wire is connected with the voltage regulator.
Preferably, the metal block is an aluminum block.
Preferably, the metal pipeline is a stainless steel pipe.
On the other hand, the embodiment of the invention provides a preparation method of the light alloy cast embedded pipeline component, which comprises the following steps:
a. at least two resistance wires penetrate through the metal pipeline, so that the resistance wires are separated in the whole process and are not in contact with the metal pipeline;
b. pouring the gypsum slurry into a metal pipeline, heating and preserving heat after the gypsum slurry is solidified to form a gypsum core, and drying after crystal water in the gypsum core is completely volatilized;
c. the resistance wires are connected through the metal blocks, so that the resistance wires are powered off after the metal blocks are melted, each resistance wire cannot be contacted during connection, and the resistance wires are also connected with the voltage regulator.
Based on the further improvement of the method, in the step b, the heating temperature is 350-400 ℃, and the heat preservation time is 4-5 h.
In another aspect, an embodiment of the present invention provides a method for casting a light alloy part with an embedded pipeline, where the method for casting an embedded pipeline assembly with a light alloy of the present invention includes:
step 1: when the casting mold is assembled, the light alloy casting embedded pipeline assembly is placed in the casting mold;
step 2: after the shaping is finished, the resistance wire is connected with a power supply to heat;
and step 3: controlling the voltage at two ends of the resistance wire through a voltage regulator, and pouring a casting after the metal block is melted;
and 4, step 4: and after the pouring is finished, removing sand and removing a gypsum core and a resistance wire in the metal pipeline to finish the casting of the light alloy part with the embedded pipeline.
Preferably, in step 2, the power supply is an ac power supply or a dc power supply.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) the light alloy casting embedded pipeline component is provided with a heating element (such as a resistance wire), an insulating heat-preservation part (such as a gypsum core) and an overload protection element (such as a metal block), based on the resistance heating principle, when the resistance wire is connected with a power supply, the temperature of the resistance wire can be continuously increased, when the temperature of the resistance wire reaches the melting point of the metal block (such as 660 ℃ of the melting point of aluminum), the metal block is melted, the resistance wire is powered off, and automatic overload protection and accurate temperature control in the heating process are realized.
(2) After the metal block is melted, the temperature of the embedded metal pipeline reaches the temperature near the melting point of the metal block (for example, 550-650 ℃), and due to the heat preservation effect of the gypsum core, the temperature of the metal pipeline can be kept at the temperature near the melting point for 120-180s, so that the phenomenon that the metal pipeline is separated from the casting body due to the fact that the cooling speed of the metal pipeline is different from the cooling speed of the casting in the casting solidification process is avoided, the bonding force and the bonding stability of the metal pipeline and the casting are effectively improved, and the light alloy casting with higher overall performance is guaranteed to be prepared.
(3) The invention can select the metal block with the corresponding melting point according to the temperature required in the actual casting process, and the temperature of the metal pipeline can still be kept around the casting temperature after the resistance wire is powered off, thereby realizing the accurate control of the temperature and ensuring the casting performance.
(4) The invention adopts the current heating technology to indirectly heat the metal pipeline, can realize the rapid heating of the pipeline, does not need manual operation in the whole process, and eliminates the potential safety hazard. The resistance wire is arranged in the metal pipeline assembly needing to be embedded in a penetrating mode, the heat preservation effect of the gypsum core is combined, the uniformity of pipeline heating can be improved, and the forming quality is guaranteed.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a light alloy cast-in-place piping assembly of the present invention.
Reference numerals:
1-metal piping; 2-a gypsum core; 3-resistance wire; 4-a metal block; 5-a voltage regulator.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
In the existing casting production, the pipeline forming process is generally divided into various forming modes such as sand core forming, metal pipeline insert casting and then corrosion forming, direct insert casting forming and the like. For the direct insert casting molding of the pipeline, in order to ensure the binding force between the metal pipeline and the casting and prevent the interface separation between different metals, the metal pipeline must be ensured to have high enough temperature in the pouring process. Therefore, the metal pipe must be heat treated before or during casting.
The pipeline heating process comprises the modes of heating the metal pipeline after being assembled and the casting mold together, heating the metal pipeline separately, then assembling the metal pipeline and heating the metal pipeline separately after being assembled and the like, wherein if the metal pipeline after being assembled and the sand mold are heated together, the heating temperature cannot exceed 200 ℃, otherwise, the strength of the sand mold disappears; if the metal pipeline is heated and then assembled, the assembly work cannot be carried out due to the high heating temperature, and the pipeline heating effect disappears due to the long time interval from the heating of the pipeline to the final pouring; the technology of independently heating the metal pipelines after the assembly has obvious advantages in sand casting, and can realize higher temperature in short time before pouring.
In the process of independently heating the assembled metal pipeline, if the metal pipeline is directly connected with a power supply to carry out current heating, the heating temperature of the pipeline needs to be indirectly estimated by controlling the heating time, and because the electrifying time is only 5-10s, the method has higher requirement on the operation speed and cannot accurately control the temperature of the pipeline, so that the heating temperature is inconsistent every time, and the stability of the process cannot be ensured; in addition, when the current heating technology is directly carried out on the metal pipeline, the pipeline needs to be rapidly heated, large current needs to pass through the pipeline in a short time, manual operation is needed in the whole process, and otherwise, the heating and pouring of the next casting pipeline cannot be carried out, so that the potential safety hazard is large; in addition, the skin effect occurs on the surface of the pipeline when current passes through the pipeline, and the temperature of the pipeline is also non-uniform due to the conditions of non-uniform pipeline material, shape change and the like.
In view of the above technical problems, in one aspect, the present invention provides a light alloy cast-in-line pipeline assembly, as shown in fig. 1, the light alloy cast-in-line pipeline assembly includes a metal pipeline 1, and a thermal insulation member, a heating element and an overload protection element disposed in the metal pipeline 1;
the heating element is fixed in the metal pipeline 1 through a heat-insulating part; the overload protection element is arranged in a heating circuit of the heating element, and when the heating temperature reaches the required temperature, the overload protection element works and the heating element stops heating.
When the light alloy casting embedded pipeline assembly is implemented, the light alloy casting embedded pipeline assembly is placed in a sand mold, after the assembly is completed, a heating element is electrified to be heated, heat is transferred to a metal pipeline, when a certain temperature is reached, an overload protection element works to stop heating the heating element, at the moment, the temperature of the metal pipeline can be kept near the casting temperature for a period of time due to the heat preservation effect of a heat preservation insulating part, the casting temperature is accurately controlled, and the whole process is safe and does not need manual operation.
Exemplarily, as shown in fig. 1, the heating element is a resistance wire 3, the number of the resistance wires 3 is more than two, and the resistance wires 3 penetrate through the metal pipeline 1;
the overload protection element is a metal block 4, and the resistance wire 3 is powered off after the metal block 4 is melted, so that heating is stopped;
the heat-insulation insulating part is a gypsum core 2, the resistance wires are embedded and fixed in the gypsum core 2, the gypsum core 2 is filled in the metal pipeline 1, and the resistance wires 3 are spaced.
The light alloy casting embedded pipeline component can be used in a sand mould casting mould, when in implementation, the light alloy casting embedded pipeline component is arranged in a sand mould during moulding, after moulding is finished, the power supply is connected with the resistance wire 3, the temperature begins to rise after the resistance wire 3 is electrified, the metal pipeline 1 is heated, when the temperature of the resistance wire 3 reaches the melting point of the metal block 4, the metal block 4 starts to melt, after the metal block 4 connected with the resistance wire 3 melts, the resistance wire is cut off, thereby automatically cutting off the power supply and realizing the automatic overload protection in the heating process, at the moment, due to the heat preservation function of the gypsum core 2, the temperature of the metal pipeline 1 can be kept near the melting point of the metal block 4 for as long as 120-180s, the precise control of the temperature of the metal pipeline 1 is realized, thereby improving the bonding force and the bonding stability between the metal pipeline 1 and the casting, and ensuring the safety and the reliability of the whole operation process.
Compared with the prior art, the light alloy cast embedded pipeline assembly can realize automatic overload protection in the heating process, and has high safety and accurate temperature control; and due to the heat preservation effect of the gypsum core 2, the phenomenon that the metal pipeline 1 is separated from the casting body due to the fact that the cooling speed of the metal pipeline 1 is different from the cooling speed of the casting in the solidification process of the casting is avoided, the binding force and the binding stability of the metal pipeline 1 and the casting are effectively improved, and therefore the light alloy casting with high overall performance is guaranteed to be prepared.
In the present invention, there is no particular limitation on the specific arrangement manner of the resistance wires, as long as the resistance wires 3 are powered off after the metal block 4 is melted, for example, the resistance wires 3 are arranged in parallel or in series. When the resistance wires 3 are arranged in parallel, one end of each resistance wire 3 can be connected to the same metal block 4, and the other end is externally connected with a power supply; when the resistance wires are arranged in series, the resistance wires 3 can be connected in series end to end, and a metal block 4 is arranged between two resistance wires 3.
In practical application, a plurality of light alloy cast embedded pipeline components can be arranged in the sand mold, at the moment, the resistance wires 3 in the light alloy cast embedded pipeline components can be connected in series, and the metal block 4 is arranged at the joint of the resistance wires 3 in at least one light alloy cast embedded pipeline component, so that after the metal block 4 is melted, the whole resistance wire 3 is powered off.
In the invention, the number of the resistance wires 3 can be selected according to the inner diameter of the metal pipeline 1, and more resistance wires 3 can be selected when the inner diameter of the metal pipeline 1 is larger, so that the heating effect of the resistance wires 3 on the metal pipeline 1 is realized.
Considering the actual metal pipeline condition in the light alloy casting process, preferably, the number of the resistance wires 3 is 2; meanwhile, considering that the two ends of the resistance wire 3 are provided with the metal blocks 4 and connected with a power supply, preferably, the two ends of the resistance wire 3 exceed the two ends of the metal pipeline 1 by at least 20 mm.
When 3 quantity of resistance wire are 2, 2 the one end of resistance wire 3 is passed through metal block 4 and is connected, simultaneously, in order to control the voltage size of resistance wire 3, the other end of 2 resistance wires 3 is connected with voltage regulator 5. The voltage of the two ends of the resistance wire 3 is controlled by the voltage regulator 5, so that the current in the resistance wire 3 and the heating speed of the resistance wire 3 are regulated.
In the present invention, the specific selection of the metal block 4 may be a metal block with a corresponding melting point according to a temperature required in an actual casting process, for example, the metal block 4 may be an aluminum block, a lead block, or a tin block. Preferably, when used for casting aluminum alloy castings, the metal block 4 is an aluminum block. The melting point of the aluminum is 660 ℃, and after the resistance wire 3 is powered off, the temperature of the metal pipeline 1 can still be kept at 550-650 ℃, so that the accurate control of the temperature is realized, and the performance of the casting is ensured.
It is noted that in selecting the material of the metal block 4, the melting point of the metal block 4 cannot be higher than the melting point of the resistance wire.
In the invention, the resistance wire 3 is selected conventionally in the field as long as the temperature resistance of the resistance wire 3 can meet the casting pouring temperature, and for example, the resistance wire can be Cr15Ni60, Cr20Ni35 or 0Cr27Al7Mo 2.
In the present invention, the selection of the metal pipeline 1 is not particularly limited, and may be a conventional selection in the art, and preferably, the metal pipeline 1 is a stainless steel pipe.
In another aspect, the present invention provides a method for manufacturing an embedded pipe assembly cast with a light alloy according to the present invention, the method comprising:
a. at least two resistance wires 3 penetrate through the metal pipeline 1, the separation of the resistance wires 3 is ensured in the whole process, and the resistance wires 3 are not contacted with the metal pipeline 1;
b. pouring the gypsum slurry into the metal pipeline 1, heating and preserving heat after the gypsum slurry is solidified to form a gypsum core 2, and drying after crystal water in the gypsum core 2 is completely volatilized;
c. the resistance wires 3 are connected through the metal blocks 4, so that the resistance wires 3 are powered off after the metal blocks 4 are melted, each resistance wire 3 cannot be contacted during connection, and the resistance wires 3 are also connected with the voltage regulator 5.
In the step b, the concrete operation method for pouring the gypsum slurry into the metal pipeline 1 is not particularly limited as long as the gypsum can be solidified in the metal pipeline 1, and the resistance wires 3 are not in contact with each other, and the resistance wires 3 are not in contact with the metal pipeline 1. For example, before gypsum is poured, one end of the metal pipeline 1 can be sealed, the resistance wire 3 at the sealed end penetrates through the seal, the resistance wire 3 is straightened to be not in contact with each other and not in contact with the metal pipeline 1, gypsum slurry is poured into the metal pipeline 1, and after the gypsum slurry is solidified, the seal is removed.
In step b, the heating mode can be selected conventionally in the field as long as the crystal water of the gypsum can be volatilized, preferably, the heating mode is that the light alloy casting embedded pipeline assembly containing the gypsum core 2 is placed in a resistance furnace to be heated, further preferably, the heating temperature is 350-400 ℃, and the heat preservation time is 4-5 h. The crystal water in the gypsum can be completely volatilized through the heat preservation process after heating.
In step b, the drying means may be conventional in the art, for example, the light alloy cast-in-line pipe assembly containing the gypsum core 2 may be placed in a drying vessel for drying.
In the step c, the connection mode between the resistance wire 3 and the metal block 4 may be a conventional method in the art, for example, the connection mode may be a welding mode, the resistance wire 3 at the connection position cannot be contacted during the connection, and the connection can be performed only through the metal block 4, so that the resistance wire 3 is disconnected after the metal block 4 is melted.
On the other hand, the invention also provides a casting method of a light alloy part with an embedded pipeline, the light alloy part with the embedded pipeline is cast by the light alloy part, and the casting method of the light alloy part comprises the following steps:
step 1: when the casting mold is assembled, the light alloy casting embedded pipeline assembly is placed in the casting mold;
step 2: after the shaping is finished, the resistance wire 3 is connected with a power supply to heat;
and step 3: controlling the voltage at two ends of the resistance wire 3 through a voltage regulator 5, and pouring a casting after the metal block 4 is melted;
and 4, step 4: and after the pouring is finished, removing sand and removing the gypsum core 2 and the resistance wire 3 in the metal pipeline 1 to finish the casting of the light alloy part with the embedded pipeline.
In the invention, in the step 2, the power supply is an alternating current power supply or a direct current power supply.
In step 3, the voltage at two ends of the resistance wire 3 controlled by the voltage regulator 5 is preferably 220-380V.
In the step 3, considering that the temperature of the light alloy casting embedded pipeline assembly can be kept for 180s after the metal block 4 is melted, casting pouring is rapidly carried out and pouring is rapidly completed after the metal block 4 is melted.
In the step 4, a high-pressure water gun can be used for removing the gypsum core 2 and the resistance wire 3 in the metal pipeline 1.
The technical solution and technical effects of the present invention are further described below by specific examples.
In the following examples, the resistance wire is Cr15Ni 60.
Example 1
And (4) preparing the light alloy cast embedded pipeline assembly.
(1) Two resistance wires penetrate into a stainless steel pipeline, the resistance wires are separated in the whole process, the two ends of the resistance wires are exposed out of the stainless steel pipeline by 25mm, and the resistance wires are not in contact with the stainless steel pipeline;
(2) pouring the mixed gypsum slurry into a stainless steel pipeline, heating the gypsum slurry in a resistance furnace after the gypsum slurry is solidified into a gypsum core at the heating temperature of 350 ℃, preserving the heat for 5 hours, taking out the gypsum core after crystal water in the gypsum core is completely volatilized, and drying the gypsum core in a dryer;
(3) one ends of the two resistance wires are respectively welded on the same aluminum block, the two resistance wires are not contacted during welding and are only connected through the aluminum block, and the other ends of the resistance wires are connected with the voltage regulator.
Example 2
An aluminum alloy casting with an embedded pipeline was cast using the light alloy cast embedded pipeline assembly prepared in example 1. And sand casting is adopted.
(1) When the sand mould is assembled, the light alloy casting embedded pipeline assembly is placed in a sand mould;
(2) after the sand mold assembly is finished, connecting the resistance wire with a power supply;
(3) adjusting a pressure regulator to 380v, heating the stainless steel pipeline, melting an aluminum block when the temperature of the stainless steel pipeline reaches 660 ℃, disconnecting a resistance wire after melting, and finishing heating;
(4) and after the heating is finished, pouring is rapidly finished, after the casting pouring is finished, sand is removed, and a high-pressure water gun is used for removing the gypsum core and the resistance wire in the stainless steel pipeline.
In the cast aluminum alloy casting with the embedded pipeline of the embodiment, the stainless steel pipeline is not separated from the casting body.
Example 3
And (4) preparing the light alloy cast embedded pipeline assembly.
(1) Two resistance wires penetrate into a stainless steel pipeline, the whole process ensures that the resistance wires are separated, the two ends of the resistance wires are exposed out of the stainless steel pipeline with the length of 21mm, and the resistance wires are not in contact with the stainless steel pipeline;
(2) pouring the mixed gypsum slurry into a stainless steel pipeline, heating the gypsum slurry in a resistance furnace after the gypsum slurry is solidified into a gypsum core at the temperature of 400 ℃, preserving the heat for 4 hours, taking out the gypsum core after crystal water in the gypsum core is completely volatilized, and drying the gypsum core in a dryer;
(3) one ends of the two resistance wires are respectively welded on the same aluminum block, the two resistance wires are not contacted during welding and are only connected through the aluminum block, and the other ends of the resistance wires are connected with the voltage regulator.
Example 4
An aluminum alloy casting with an embedded pipeline was cast using the light alloy cast embedded pipeline assembly prepared in example 3. And sand casting is adopted.
(1) When the sand mould is assembled, the light alloy casting embedded pipeline assembly is placed in a sand mould;
(2) after the sand mold assembly is finished, connecting the resistance wire with a power supply;
(3) adjusting a pressure regulator to 300v, heating the stainless steel pipeline, melting an aluminum block when the temperature of the stainless steel pipeline reaches 660 ℃, disconnecting a resistance wire after melting, and finishing heating;
(4) and after the heating is finished, pouring is rapidly finished, after the casting pouring is finished, sand is removed, and a high-pressure water gun is used for removing the gypsum core and the resistance wire in the stainless steel pipeline.
In the cast aluminum alloy casting with the embedded pipeline of the embodiment, the stainless steel pipeline is not separated from the casting body.
Example 5
And (4) preparing the light alloy cast embedded pipeline assembly.
(1) Two resistance wires penetrate into a stainless steel pipeline, the whole process ensures that the resistance wires are separated, the two ends of the resistance wires are exposed out of the stainless steel pipeline by 30mm, and the resistance wires are not in contact with the stainless steel pipeline;
(2) pouring the mixed gypsum slurry into a stainless steel pipeline, heating the gypsum slurry in a resistance furnace after the gypsum slurry is solidified into a gypsum core at the temperature of 380 ℃, preserving the heat for 4 hours, taking out the gypsum core after crystal water in the gypsum core is completely volatilized, and drying the gypsum core in a dryer;
(3) one ends of the two resistance wires are respectively welded on the same lead block, the two resistance wires are not contacted during welding and are only connected through the lead block, and the other ends of the resistance wires are connected with the voltage regulator.
Example 6
An aluminum alloy casting with an embedded pipeline was cast using the light alloy cast embedded pipeline assembly prepared in example 5. And sand casting is adopted.
(1) When the sand mould is assembled, the light alloy casting embedded pipeline assembly is placed in a sand mould;
(2) after the sand mold assembly is finished, connecting the resistance wire with a power supply;
(3) adjusting a voltage regulator to 260v, heating the stainless steel pipeline, melting the lead block when the stainless steel pipeline reaches 327 ℃, disconnecting the resistance wire after melting, and finishing heating;
(4) and after the heating is finished, pouring is rapidly finished, after the casting pouring is finished, sand is removed, and a high-pressure water gun is used for removing the gypsum core and the resistance wire in the stainless steel pipeline.
In the cast aluminum alloy casting with the embedded pipeline of the embodiment, the stainless steel pipeline is not separated from the casting body.
Example 7
The light alloy casting embedded pipeline assembly is prepared according to the method in the embodiment 1, and the difference is that 3 resistance wires are arranged in a stainless steel pipeline and are connected in parallel, namely, one ends of the three resistance wires are respectively welded on the same aluminum block, during welding, the three resistance wires are not contacted with each other and are only connected through the aluminum block, and the other ends of the resistance wires are connected with a voltage regulator.
Example 8
Aluminum alloy castings with embedded lines were cast according to the method of example 1, except that the light alloy cast embedded line assembly prepared in example 7 was used.
In the cast aluminum alloy casting with the embedded pipeline of the embodiment, the stainless steel pipeline is not separated from the casting body.
Comparative example 1
And (3) casting an aluminum alloy casting with an embedded pipeline by adopting a stainless steel pipeline. And sand casting is adopted.
(1) When the sand mould is assembled, the stainless steel pipeline is placed in a sand mould;
(2) after the sand mold assembly is completed, the stainless steel pipeline is connected with a power supply, the stainless steel pipeline is heated, and the stainless steel pipeline is powered on for 10 seconds and then is powered off, so that the heating is finished;
(3) and pouring after heating is finished.
In the aluminum alloy casting with the embedded pipeline cast in comparative example 1, the stainless steel pipeline was separated from the casting body.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The light alloy casting embedded pipeline assembly is characterized by comprising a metal pipeline (1), and a heat-insulating part, a heating element and an overload protection element which are arranged in the metal pipeline (1);
the heating element is fixed in the metal pipeline (1) through a heat-insulating part; the overload protection element is arranged in a heating circuit of the heating element, and when the heating temperature reaches the required temperature, the overload protection element works and the heating element stops heating.
2. The light alloy cast-in-line piping component of claim 1,
the heating elements are resistance wires (3), the number of the resistance wires (3) is more than two, and the resistance wires (3) penetrate through the metal pipeline (1);
the overload protection element is a metal block (4), the resistance wire (3) is powered off after the metal block (4) is melted, and heating is stopped;
the heat-insulation insulating part is a gypsum core (2), the resistance wires are embedded and fixed in the gypsum core (2), and the gypsum core (2) is filled in the metal pipeline (1) and separates the resistance wires (3).
3. The light alloy cast-in-place pipeline assembly according to claim 2, wherein the number of the resistance wires (3) is 2, and both ends of the resistance wires (3) exceed both ends of the metal pipeline (1) by at least 20 mm.
4. The light alloy casting embedded pipeline assembly as claimed in claim 3, wherein one end of the resistance wire (3) is connected with the metal block (4), and the other end is connected with the pressure regulator (5).
5. The light alloy cast-in-place piping component of any of claim 4, wherein the metal block (4) is an aluminum block.
6. The light alloy cast-in-place pipe assembly according to any one of claims 2 to 4, wherein the metal pipe (1) is a stainless steel pipe.
7. A method for manufacturing a light alloy cast-in-place pipe assembly according to any one of claims 2 to 6, wherein the method for manufacturing comprises:
a. at least two resistance wires (3) penetrate through the metal pipeline (1), the separation of the resistance wires (3) is ensured in the whole process, and the resistance wires (3) are not contacted with the metal pipeline (1);
b. pouring the gypsum slurry into the metal pipeline (1), heating and preserving heat after the gypsum slurry is solidified to form a gypsum core (2), and drying after crystal water in the gypsum core (2) is completely volatilized;
c. the resistance wires (3) are connected through the metal block (4), so that the resistance wires (3) are powered off after the metal block (4) is melted, each resistance wire (3) cannot be contacted during connection, and the resistance wires (3) are also connected with the voltage regulator (5).
8. The method as claimed in claim 7, wherein the heating temperature in step b is 350-400 ℃, and the holding time is 4-5 h.
9. A method for casting a light alloy member with an embedded pipeline, wherein the light alloy member with the embedded pipeline as set forth in any one of claims 2 to 6 is used for casting an embedded pipeline assembly, the casting method comprising:
step 1: when the casting mold is assembled, the light alloy casting embedded pipeline assembly is placed in the casting mold;
step 2: after the shaping is finished, the resistance wire (3) is connected with a power supply to heat;
and step 3: controlling the voltage at two ends of the resistance wire (3) through a voltage regulator (5), and pouring a casting after the metal block (4) is melted;
and 4, step 4: and after the pouring is finished, removing sand and removing the gypsum core (2) and the resistance wire (3) in the metal pipeline (1), and finishing the casting of the light alloy part with the embedded pipeline.
10. The casting method according to claim 9, wherein in step 2, the power source is an alternating current power source or a direct current power source.
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| CN202111329222.4A CN114029450A (en) | 2021-11-10 | 2021-11-10 | Light alloy casting embedded pipeline assembly and preparation method thereof and casting method of light alloy part with embedded pipeline |
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| CN209520337U (en) * | 2019-01-24 | 2019-10-22 | 西华大学 | A kind of sand casting self-heating arbor |
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| GB336270A (en) * | 1929-04-11 | 1930-10-13 | Antonio Negromanti | Improvements in and relating to electrically heated fabrics |
| JPS56128659A (en) * | 1980-03-15 | 1981-10-08 | Hiroshi Ochiai | Antifreezing device made of cast iron inserted with tubular electric heating element |
| JPH0577026A (en) * | 1991-09-25 | 1993-03-30 | Mazda Motor Corp | Composite cam shaft and manufacture of same |
| JPH11197817A (en) * | 1998-01-19 | 1999-07-27 | Isuzu Motors Ltd | Method for inserting hollow body as cast-in |
| JP2008221295A (en) * | 2007-03-14 | 2008-09-25 | Toyota Motor Corp | Casting-in method for pipe |
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