CN111822948A - Manufacturing method of automobile central control box and new energy automobile - Google Patents
Manufacturing method of automobile central control box and new energy automobile Download PDFInfo
- Publication number
- CN111822948A CN111822948A CN202010553958.9A CN202010553958A CN111822948A CN 111822948 A CN111822948 A CN 111822948A CN 202010553958 A CN202010553958 A CN 202010553958A CN 111822948 A CN111822948 A CN 111822948A
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- water channel
- central control
- control box
- box body
- manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- 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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a manufacturing method of an automobile central control box, which adopts low-pressure casting to manufacture a central control box body with a water channel; flushing a water channel cover plate with a water channel in a CNC (computerized numerical control) manner; and welding the water channel cover plate to the water channel of the central control box body through friction welding, wherein the welded water channel cover plate and the central control box body form a sealed cavity. The invention adopts a low-pressure casting mode to manufacture the central control box body with the water channel, adopts a CNC mode to manufacture the water channel cover plate with the water channel, and welds the central control box body with the water channel and the water channel cover plate with the water channel in a friction welding mode to form a brand-new process.
Description
Technical Field
The invention relates to the technical field of automobile part manufacturing, in particular to a manufacturing method of a central control box applied to a new energy automobile.
Background
Along with new energy automobile is more and more popular, and the important part of control system is placed as new energy automobile to the car center control case, the part that control system relates to is many, in order to satisfy laying and integrating of each system, it is current to place control system in the box of difference, again with each box accordant connection, this kind of mode makes the weight of whole automobile body increase, and circuit connection is troublesome between each part, the production technology is loaded down with trivial details, the cost of manufacture is high, there is certain limitation in the application on new energy automobile. In order to reduce the number of assembly parts of an automobile as much as possible, reduce the weight of an automobile body and reduce energy consumption, a central control box integrating each control module into one box body is developed later, but because the number of the integrated modules is large, the heat dissipation performance is poor, the die sinking cost is high by adopting a high-pressure casting mode, the die sinking period is long, under the condition of adopting friction stir welding, only crystal bodies exist on the welding surface, the cold-joint condition is easy to occur, the material consumption is large, the air tightness and the mechanical performance of a product are poor, bubbles are easy to generate, under the condition of vibration or impact, the desoldering condition is easy to occur, and the requirements of light weight and high heat dissipation performance of the current new energy automobile are difficult to meet.
Disclosure of Invention
The invention provides a manufacturing method of an automobile central control box and a new energy automobile, which are simple in structure and method, light in weight, good in heat dissipation performance of the central control box, high in integration level, good in air tightness and mechanical performance, capable of effectively reducing the die sinking cost, short in die sinking period, beneficial to reducing the automobile manufacturing cost and saving energy consumption.
The invention provides a manufacturing method of an automobile central control box, which comprises the following steps:
selecting an aluminum ingot for manufacturing the central control box body and an aluminum plate for manufacturing the water channel cover plate;
casting the aluminum ingot at low pressure to prepare a central control box body with a water channel;
adopting a CNC mode to wash the aluminum plate to form a water channel cover plate with a water channel and a flat surface;
assembling the water channel cover plate on the water channel of the central control box body, enabling one side of the water channel cover plate with the water channel to face towards the water channel of the central control box body, enabling the flat surface of the water channel cover plate to face upwards, confirming that the water channel cover plate is flatly attached to the central control box body, welding the water channel cover plate on the water channel of the central control box body through friction welding, and enabling the welded water channel cover plate and the central control box body to form a sealed cavity.
Preferably, the low-pressure casting comprises sand core manufacturing, smelting, casting, heat treatment, sprue removal, sand removal, polishing and shot blasting of the aluminum ingot.
Preferably, the smelting specifically comprises placing an aluminum ingot on the edge of a smelting furnace and heating to remove moisture, heating the smelting furnace to raise the temperature in the smelting furnace to 850-900 ℃, placing the heated aluminum ingot into the heated smelting furnace, and after the temperature in the transfer pot is heated to 750-770 ℃, pouring the aluminum liquid heated to above 730 ℃ in the smelting furnace into the heated transfer pot.
Preferably, the aluminum strontium is placed on a transfer pot to be heated to remove moisture, before the molten aluminum is poured into the transfer pot, the aluminum strontium with the moisture removed is placed into the transfer pot, and the mass percentage of the aluminum strontium in the molten aluminum is 0.25-0.35%.
Preferably, removing slag from the molten aluminum poured into the transfer pot, specifically, when the temperature of the molten aluminum in the transfer pot rises to 710-730 ℃, stirring by using a nitrogen refining degasser for removing hydrogen for 20-30 min, adding a slag striking agent with the concentration of 0.3% while removing hydrogen, and scooping out oxidized slag on the surface layer of the molten aluminum by using a slag scooping spoon after hydrogen removal is completed.
Preferably, the sand core is manufactured by selecting corresponding precoated sand according to different structures of the central control box main body and adopting a sand core machine, the temperature of the mould is controlled to be 190-210 ℃, the sand shooting pressure is 0.5-0.65 MPa, the sand shooting time is more than 4S, the exhaust time is more than 10S, and the curing time is more than 340S.
Preferably, the equipment adopted for casting is a low-pressure casting machine, and specifically, the casting is carried out by confirming that the temperature of aluminum liquid reaches 690-710 ℃, the temperature of a mold reaches 340-380 ℃, the temperature difference of the same module is less than or equal to 40 ℃, a pouring gate is warmed for 15-20 times until the pouring gate reaches a state of not hanging aluminum, the pressure is stable in the casting process, the mold is airtight, after the casting is finished, the mold is opened after cooling for more than 160 seconds, the side mold is opened firstly, then the upper mold is opened, and the cast central control box body is taken out.
Preferably, the heat treatment specifically comprises the steps of placing the cast central control box body on a conveyor belt of a solid melting furnace, starting the solid melting furnace, setting the melting temperature at 520-540 ℃ and the melting temperature time at 6h, and automatically conveying the central control box body into the solid melting furnace for solid melting; after the solid melting is finished, placing the solid-melted central control box body into a water tank, and cooling for 3 min; after cooling, placing the central control box body into an aging furnace, setting the temperature in the aging furnace at 160-180 ℃, and keeping the aging temperature for 4 hours; the testing hardness of the aged product reaches more than HB80 degrees, and the heat treatment process is completed.
Preferably, the friction welding adopts a friction stir welding machine tool, a water channel cover plate is positioned on a water channel of the central control box body before welding, the matching of the water channel cover plate and the central control box body is confirmed, the section difference is less than or equal to 0.2mm, the single-side matching gap is less than or equal to 0.2mm, the distance between the tool withdrawal hole and the welding part must be 10-15 mm during welding, and the friction welding head sinks into a product to be welded by 0.40-0.45 mm.
The invention also provides a new energy automobile which comprises the automobile central control box produced by the manufacturing method.
The invention discloses a manufacturing method of an automobile central control box and a new energy automobile.A central control box body with a water channel is manufactured in a low-pressure casting mode, a water channel cover plate with a water flow channel is manufactured in a CNC mode, and the central control box body and the water channel cover plate are welded in a friction stir welding mode to form a brand-new process. The sand core mould is adjusted according to the requirement, so that the central control boxes with different integration levels can be obtained, the cost of the sand core mould is low, the central control box body is provided with the water channel, so that the heat dissipation performance of the central control box is good, and the requirements of high integration and light weight of the existing automobile central control box are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a center console box of an automobile to which the present invention relates;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a manufacturing method of an automobile central control box, which comprises the following steps: selecting an aluminum ingot for manufacturing the central control box body and an aluminum plate for manufacturing the water channel cover plate; casting the aluminum ingot at low pressure to prepare a central control box body with a water channel; adopting a CNC mode to wash the aluminum plate to form a water channel cover plate with a water channel and a flat surface; assembling the water channel cover plate on the water channel of the central control box body, enabling one side of the water channel cover plate with the water channel to face towards the water channel of the central control box body, enabling the flat surface of the water channel cover plate to face upwards, confirming that the water channel cover plate is flatly attached to the central control box body, welding the water channel cover plate on the water channel of the central control box body through friction welding, and enabling the welded water channel cover plate and the central control box body to form a sealed cavity. The friction welding adopts a friction stir welding machine tool, a water channel cover plate is positioned on a water channel of a central control box body before welding, the matching of the water channel cover plate and the central control box body is confirmed, the section difference is less than or equal to 0.2mm, the single-side matching gap is less than or equal to 0.2mm, the distance between the tool withdrawal hole and a welding part is required to be 10-15 mm during welding, and a friction welding head is sunk into a product to be welded for 0.40-0.45 mm.
The low-pressure casting comprises sand core manufacturing, smelting, casting, heat treatment, sprue removal, sand removal, polishing and shot blasting of the aluminum ingot.
The sand core is prepared before casting, the shape and the number of the sand core are adjusted according to the requirement of a functional structure of the central control box to be manufactured, five sand cores are used in one time in the embodiment, namely, the multifunctional central control box can be manufactured, specifically, corresponding precoated sand is selected and manufactured by adopting the sand core machine, no mold staggering phenomenon exists after the mold is installed, the parting surface gap is below 0.3mm, and the heating is carried out after the mold is opened; in the embodiment, the temperature of the mold is controlled to be 190-210 ℃, the sand shooting pressure is 0.5-0.65 MPa, the sand shooting time is 4S, the exhaust time is 10S, and the curing time is 340S. Before core shooting, the molded surface of the mold must be cleaned, so that air holes and exhaust passages are ensured to be free from blockage, and the self-inspection of the front five sand cores which are shot meets the manufacturing requirements. After the sand core is demoulded, spraying the organic silicon emulsion on the sand core, checking the inner cavity before an operator replaces a core box each time, manually polishing the broken and damaged part and the inverted part of the inner cavity, removing a coating layer on the surface of the core box, and ensuring that the surface of the sand core is smooth and clean; and (3) trimming the core head, the residual sand and the fleshy part of the core by using a scraper to ensure that each sand core has no residual sand, excessive materials and recess, and placing the sand core in an oven before use.
According to the volume of the smelting furnace, the weight of the aluminum ingot is confirmed, the smelting is specifically that the aluminum ingot is placed on the edge of the smelting furnace and heated to remove moisture, the smelting furnace is heated to raise the temperature in the smelting furnace to 850-900 degrees, 880 ℃ is adopted in the embodiment, the heated aluminum ingot is placed in the heated smelting furnace, aluminum strontium is placed on a transfer pot to be heated to remove moisture, before the aluminum liquid is poured into the transfer pot, the aluminum strontium with the moisture removed is placed in the transfer pot, the mass percentage of the aluminum strontium in the aluminum liquid is 0.25-0.35%, after the temperature in the transfer pot is heated to 750-770 ℃, the aluminum liquid heated to above 730 ℃ in the smelting furnace is poured into the heated transfer pot.
Removing slag from the molten aluminum poured into the transfer pot, specifically, stirring and removing hydrogen for 20-30 min by using a nitrogen refining degasser when the temperature of the molten aluminum in the transfer pot rises to 710-730 ℃, adding a slag beating agent with the concentration of 0.3% while removing hydrogen, and scooping out oxidized slag on the surface layer of the molten aluminum by using a slag scooping spoon after hydrogen removal is completed; after the oxidized slag is cleaned up, transferring and pouring molten aluminum into a heat preservation furnace; adding the aluminum liquid into the low-pressure machine heat preservation furnace within 10 minutes, scooping out the oxidation slag on the surface layer of the aluminum liquid in the low-pressure machine heat preservation furnace by using a slag scooping spoon, and feeding the prepared aluminum liquid into the next process.
The casting equipment is a low-pressure casting machine, the prepared sand core is placed into the low-pressure casting machine, the temperature of aluminum liquid is confirmed to reach 690-710 ℃, the temperature of a mold reaches 340-380 ℃, the temperature difference of the same module is less than or equal to 40 ℃, a pouring gate is warmed for 15-20 times, the casting is carried out until the pouring gate reaches a state without hanging aluminum, the pressure is stable in the casting process, the mold is airtight, after the casting is finished, the mold is opened after being cooled for more than 160 seconds, a side mold is opened firstly, then the upper mold is opened, the upper mold is lifted and is higher than a material receiving vehicle; and (3) opening the material receiving vehicle, wherein the distance between the product and the numerical control vehicle cannot be higher than 120mm, ejecting the product, then opening the material receiving vehicle, taking out the cast central control box body, detecting the phenomena of excessive material, insufficient casting, damage, cold shut, looseness, penetrability air holes and the like of the central control box body, and switching to a heat treatment process.
The heat treatment is specifically that the cast central control box body is placed on a conveyor belt of a solid melting furnace, the solid melting furnace is started, the melting temperature is set to 520-540 ℃, the melting temperature time is set to 6 hours, and the central control box body is automatically conveyed into the solid melting furnace for solid melting; after the solid melting is finished, placing the solid-melted central control box body into a water tank, and cooling for 3 min; after cooling, placing the central control box body into an aging furnace, setting the temperature in the aging furnace at 160-180 ℃, and keeping the aging temperature for 4 hours; the testing hardness of the aged product reaches more than HB80 degrees, and the heat treatment process is completed.
The sprue removing process mainly comprises the steps of sawing off the central control box body by a sawing machine, then transferring to a sand removing process, scraping sand grains at the corner positions of the sand core surface of a product by using metal strips, blowing the sand grains in the product by using an air gun, and removing sand grains on the surface of the central control box body after sand removing. After sand removal, a grinding tool is used for grinding the parting line and the burr of the convex part, and then a shot blasting machine is used for discharging. And finally, friction welding the manufactured water channel cover plate and the central control box body to obtain a central control box product.
The invention also provides a new energy automobile which comprises the automobile central control box produced by the manufacturing method.
As shown in the attached figure 1, the automobile central control box produced by the invention comprises a central control box body 1 and a water channel cover plate 2, wherein the water channel cover plate is welded on the position of a water channel of the central control box body through friction welding, a water flow channel is formed between the welded central control box body and the water channel cover plate, and cooling liquid is injected to effectively dissipate heat of the central control box.
The invention discloses a new energy automobile which comprises an automobile central control box produced by the manufacturing method.
The invention discloses a manufacturing method of an automobile central control box and a new energy automobile.A central control box body with a water channel is manufactured in a low-pressure casting mode, a water channel cover plate with a water flow channel is manufactured in a CNC mode, and the central control box body and the water channel cover plate are welded in a friction stir welding mode to form a brand-new process. The sand core mould is adjusted according to the requirement, so that the central control boxes with different integration levels can be obtained, the cost of the sand core mould is low, the central control box body is provided with the water channel, so that the heat dissipation performance of the central control box is good, and the requirements of high integration and light weight of the existing automobile central control box are met.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A manufacturing method of an automobile central control box is characterized by comprising the following steps:
selecting an aluminum ingot for manufacturing the central control box body and an aluminum plate for manufacturing the water channel cover plate;
casting the aluminum ingot at low pressure to prepare a central control box body with a water channel;
adopting a CNC mode to wash the aluminum plate to form a water channel cover plate with a water channel and a flat surface;
assembling the water channel cover plate on the water channel of the central control box body, enabling one side of the water channel cover plate with the water channel to face towards the water channel of the central control box body, enabling the flat surface of the water channel cover plate to face upwards, confirming that the water channel cover plate is flatly attached to the central control box body, welding the water channel cover plate on the water channel of the central control box body through friction welding, and enabling the welded water channel cover plate and the central control box body to form a sealed cavity.
2. The manufacturing method of the center console box for the automobile according to claim 1, characterized in that: the low-pressure casting comprises sand core manufacturing, smelting, casting, heat treatment, sprue removal, sand removal, polishing and shot blasting on the aluminum ingot.
3. The manufacturing method of the center console box for the automobile as set forth in claim 2, wherein: the smelting specifically comprises the steps of placing an aluminum ingot on the edge of a smelting furnace, heating to remove moisture, heating the smelting furnace to raise the temperature in the smelting furnace to 850-900 ℃, placing the heated aluminum ingot into the heated smelting furnace, and pouring aluminum liquid heated to above 730 ℃ in the smelting furnace into the heated transfer pot after the temperature in the transfer pot is heated to 750-770 ℃.
4. The manufacturing method of the center console box for the automobile as set forth in claim 3, wherein: placing the aluminum strontium on a transfer pot to be heated to remove moisture, and before pouring aluminum liquid into the transfer pot, firstly placing the aluminum strontium with the moisture removed into the transfer pot, wherein the aluminum strontium accounts for 0.25-0.35 percent of the mass of the aluminum liquid.
5. The manufacturing method of the center console box for the automobile as set forth in claim 3, wherein: and removing slag from the molten aluminum poured into the transfer pot, specifically, when the temperature of the molten aluminum in the transfer pot rises to 710-730 ℃, stirring by using a nitrogen refining degasser for removing hydrogen for 20-30 min, adding a 0.3% slag beating agent while removing hydrogen, and scooping out the oxidized slag on the surface layer of the molten aluminum by using a scooping slag spoon after the hydrogen is removed.
6. The manufacturing method of the center console box for the automobile as set forth in claim 2, wherein: the sand core is manufactured by selecting corresponding precoated sand according to different structures of the central control box main body and adopting a sand core machine, the temperature of a mould is controlled to be 190-210 ℃, the sand shooting pressure is 0.5-0.65 MPa, the sand shooting time is more than 4S, the exhaust time is more than 10S, and the curing time is more than 340S.
7. The manufacturing method of the center console box for the automobile as set forth in claim 2, wherein: the casting equipment is a low-pressure casting machine, specifically, the temperature of molten aluminum is confirmed to reach 690-710 ℃, the temperature of a mold reaches 340-380 ℃, the temperature difference of the same module is less than or equal to 40 ℃, a pouring gate is warmed for 15-20 times, the pressure is stable in the casting process until the pouring gate reaches a state of not hanging aluminum, the casting is carried out, the mold is airtight, after the casting is finished, the mold is opened after cooling for more than 160 seconds, a side mold is opened firstly, an upper mold is opened, and the cast central control box body is taken out.
8. The manufacturing method of the center console box for the automobile as set forth in claim 2, wherein: the heat treatment specifically comprises the steps of placing a cast central control box body on a conveyor belt of a solid melting furnace, starting the solid melting furnace, setting the melting temperature at 520-540 ℃ and the melting temperature time at 6h, and automatically conveying the central control box body into the solid melting furnace for solid melting; after the solid melting is finished, placing the solid-melted central control box body into a water tank, and cooling for 3 min; after cooling, placing the central control box body into an aging furnace, setting the temperature in the aging furnace at 160-180 ℃, and keeping the aging temperature for 4 hours; the testing hardness of the aged product reaches more than HB80 degrees, and the heat treatment process is completed.
9. The manufacturing method of the center console box for the automobile according to claim 1, characterized in that: the friction welding adopts a friction stir welding machine tool, a water channel cover plate is positioned on a water channel of a central control box body before welding, the matching of the water channel cover plate and the central control box body is confirmed, the section difference is less than or equal to 0.2mm, the single-side matching gap is less than or equal to 0.2mm, the distance between the position of a tool withdrawal hole and a welding part must be 10-15 mm during welding, and a friction welding head sinks into a product to be welded by 0.40-0.45 mm.
10. A new energy automobile, characterized by comprising an automobile center console box produced by the manufacturing method according to any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553958.9A CN111822948A (en) | 2020-06-17 | 2020-06-17 | Manufacturing method of automobile central control box and new energy automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010553958.9A CN111822948A (en) | 2020-06-17 | 2020-06-17 | Manufacturing method of automobile central control box and new energy automobile |
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Application publication date: 20201027 |
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