CN114260437A - Truck hub mounting disc bolt hole reinforced cooling casting forming process - Google Patents
Truck hub mounting disc bolt hole reinforced cooling casting forming process Download PDFInfo
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- CN114260437A CN114260437A CN202111604981.7A CN202111604981A CN114260437A CN 114260437 A CN114260437 A CN 114260437A CN 202111604981 A CN202111604981 A CN 202111604981A CN 114260437 A CN114260437 A CN 114260437A
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Abstract
The invention relates to the technical field of truck aluminum alloy hub casting, and discloses a truck hub mounting disc bolt hole reinforced cooling casting forming process which comprises the following steps: closing the die, and performing four-section pressurization and two-section pressure maintaining on the holding furnace of the low-pressure casting machine to fill molten aluminum in the holding furnace; water is introduced into the upper forming strong cold insert and the lower forming strong cold insert for forced cooling; and (5) after the pressure is maintained for 210 +/-20 seconds, releasing the pressure, naturally cooling for 45 +/-5 seconds, opening the die and taking out the casting. In the low-pressure casting process, the electric heating tube and the thermocouple of the upper mold core and the lower mold core cooperate to ensure that the molten aluminum between the upper mold core and the lower mold core keeps high temperature: so that the aluminum liquid between the upper die and the lower die is cooled and solidified. The aluminum liquid between the upper mold core and the lower mold core is always kept in a liquid state, and when the pressure of the low-pressure machine heat preservation furnace is relieved, most of the aluminum liquid in the center flows back to the heat preservation furnace through the liquid lifting pipe, so that a cavity is formed between the upper mold core and the lower mold core, and the utilization rate of the aluminum liquid is effectively improved.
Description
Technical Field
The invention relates to the technical field of casting of truck aluminum alloy wheel hubs, in particular to a reinforced cooling casting forming process for bolt holes of truck wheel hub mounting discs.
Background
The truck hub is an important safety part which is arranged at the brake drum part of an axle through bolts and is used for supporting tires, buffering external impact, realizing the contact between the tires and the ground and ensuring the driving performance of the truck. The hub bears the weight of the whole truck, the torque output by a gearbox or a brake drum during acceleration and deceleration is transmitted to a tire during the running process of the truck, alternating load is applied to a wheel, and continuous impact and vibration are applied to bolt holes of a hub mounting disc. Therefore, higher requirements are provided for the fatigue strength of the bolt holes of the hub mounting plate. Truck aluminum alloy hubs are typically formed by low-pressure casting. The mold for casting the wheel hub mainly comprises an upper mold, a lower mold and a side mold, wherein the upper mold, the lower mold and the side mold form a wheel hub clamping cavity. And a pouring port on the lower die is communicated with a low-pressure machine heat-preservation furnace filled with aluminum liquid. And during low-pressure casting, introducing dry compressed air into the heat preservation furnace to enable the aluminum liquid to enter the hub cavity of the truck under the pressure, and maintaining the pressure for a period of time until the whole hub is completely solidified after mold filling.
At present, the problem of low mechanical property of materials at a mounting plate generally exists in the low-pressure cast aluminum alloy truck hub. Cooling and feeding are of great importance in the production process of low-pressure casting, and the bolt hole part of the existing low-pressure casting aluminum alloy hub mounting disc is not effectively cooled or is unreasonably cooled, so that the strength of the bolt hole part of the hub mounting disc is influenced. The mounting disc bolt holes in the hub are stress concentration points when the automobile is accelerated, decelerated and turned during running, and when the automobile is impacted by circulating torque, fatigue cracks are easy to appear on the hole walls of the mounting disc bolt holes of the hub, so that the strength of the bolt holes of the aluminum alloy hub mounting disc of the truck is needed to be improved.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a cooling-enhanced casting process for forming bolt holes of a truck hub mounting plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a truck hub mounting disc bolt hole reinforced cooling casting forming process comprises a truck hub casting mold and a low-pressure casting machine, wherein the truck hub casting mold comprises an upper mold, an upper mold core, a lower mold core and a side mold, and the upper mold, the upper mold core, the lower mold core and the side mold form a truck hub cavity; an upper forming forced cooling insert is arranged at the position of the upper die, corresponding to the bolt hole of the hub mounting plate; a lower forming forced cooling insert is arranged at the part of the lower die, corresponding to the bolt hole of the hub mounting plate; the truck hub mounting disc bolt hole reinforced cooling casting forming process is based on the truck hub casting mold and comprises the following steps: and (2) closing the die, inputting dry compressed air into a holding furnace of the low-pressure casting machine, and adopting four-section pressurization and two-section pressure maintaining processes to make the molten aluminum in the holding furnace fill the hub cavity of the truck under the set process conditions and make the molten aluminum crystallize and solidify into a hub casting of the truck under the second section pressure maintaining pressure, wherein the pressurization and pressure maintaining process parameters are as follows:
(1) the first section of pressurizing pressure is 220 +/-15 mbar, and the pressurizing time is 10 +/-4 s;
(2) the second section of pressurizing pressure is 395 +/-15 mbar, and the pressurizing time is 25 +/-5 s;
(3) the third stage of pressurizing pressure is 850 +/-30 mbar, and the pressurizing time is 11 +/-5 s;
(4) the first section of pressure maintaining pressure is 850 +/-30 mbar, and the pressure maintaining time is 90 +/-15 s;
(4) the fourth stage of pressurization has pressure of 1350 + -50 mbar and pressurization time of 15 + -5 s;
(5) the second section has a pressure maintaining pressure of 1350 +/-50 mbar and a pressure maintaining time of 120 +/-15 s;
(6) after the pressure is maintained for 210 +/-30 seconds for two sections, the pressure is released, the wheel hub casting is naturally cooled for 45 +/-5 seconds, the die is opened, and the wheel hub casting is taken out, wherein in the process of the reinforced cooling casting forming process of the wheel hub mounting disc bolt holes, the forced cooling water cooling control of the mounting disc bolt hole forming is as follows: the water feeding time of the upper-forming strong cold insert is set to be 150 +/-20 s after the first-stage pressurization begins, the water feeding time lasts for 110 +/-10 s, and the water flow is 300 +/-30L/min; the time for starting water flowing of the lower-forming strong cold insert is set to be 160 +/-20 s after the first-stage pressurization is started, the time lasts for 120 +/-20 s, and the water flow is 300 +/-30L/min.
The reinforced cooling casting forming process for the bolt holes of the truck hub mounting plate provided by the invention adopts four-section pressurization and two-section pressure maintaining processes for a low-pressure casting machine holding furnace, the first section of pressure maintaining enables the rim part of a truck hub casting to be crystallized and solidified under lower pressure, the infiltration of molten aluminum into the mold closing gaps between 45-degree surfaces of a side mold and an upper mold, a lower mold and the side mold is reduced, the truck hub casting does not have obvious flash, and the subsequent processing cost of the truck hub casting is reduced; after the upper molding strong cold insert and the lower molding strong cold insert are crystallized and solidified for a period of time under lower pressure, water cooling is started, cooling around the upper molding strong cold insert and the lower molding strong cold insert is accelerated, and the crystallization and solidification quality of the bolt holes of the mounting disc and the surrounding parts is improved; and the second section of pressure maintaining enables the mounting disc part, the rim, the spoke and other parts of the truck hub casting to be crystallized and solidified under higher pressure, so that the flowing of the aluminum liquid in the feeding channel is ensured, the feeding force of the aluminum liquid between the upper mold core and the lower mold core to the mounting disc and other parts is improved, and the crystallization and solidification quality of the whole truck hub casting is improved.
Preferably, the truck hub mounting plate bolt hole cooling-enhanced casting molding process has the following parameters in the pressurizing and pressure maintaining process:
(1) the first section of pressurizing pressure is 220 +/-5 mbar, and the pressurizing time is 9 +/-2 s;
(2) the second section of pressurizing pressure is 395 +/-5 mbar, and the pressurizing time is 25 +/-2 s;
(3) the third stage of pressurization pressure is 850 +/-5 mbar, and the pressurization time is 11 +/-2 s;
(4) the first section of pressure maintaining pressure is 850 +/-20 mbar, and the pressure maintaining time is 90 +/-10 s;
(4) the fourth stage of pressurization pressure is 1350 +/-15 mbar, and the pressurization time is 15 +/-2 s;
(5) the second section has a pressure maintaining pressure of 1350 +/-50 mbar and a pressure maintaining time of 120 +/-10 s;
(6) keeping the pressure for 210 plus or minus 20s, releasing the pressure, naturally cooling for 45 plus or minus 5s, opening the die to take out the truck hub casting,
in the process of the truck hub mounting disc bolt hole reinforced cooling casting forming process, the mounting disc bolt hole forming forced cooling insert water cooling control process comprises the following steps: the water feeding time of the upper-forming strong-cooling insert is set to be 150 +/-20 s after pressurization is started, the time lasts for 110 +/-10 s, and the water flow is 300 +/-10L/min; the water flowing time of the lower-forming strong-cooling insert is set to be 160 +/-20 s after the pressurization is started, the water flowing time lasts for 120 +/-10 s, and the water flowing speed is 300 +/-10L/min.
In the scheme, the range of the pressure value and the setting range of the duration time of pressurization and pressure maintaining of each section are smaller, the process has more accurate control on the flow rate and the solidification process of the aluminum liquid in the hub cavity of the truck, ensures that the aluminum liquid has certain flow rate in the hub cavity of the truck, ensures that the temperature of the aluminum liquid is absorbed by a mould and is cooled in a certain controlled range, not only meets the requirement of mold filling, but also has enough time to ensure that the gas in the hub cavity of the truck is orderly discharged, has smaller influence on the mold filling and solidification of the hub casting of the truck, has smaller fluctuation on the mold filling and solidification of the hub casting of the truck, has higher three-section pressurization pressure of 850 +/-5 mbar, first-section pressurization pressure of 850 +/-20 mbar, fourth-section pressurization pressure of 1350 +/-15 mbar and second-section pressurization pressure of 1350 +/-50 mbar than the requirement of an obvious conventional low-pressure casting process, ensures that the aluminum liquid can better flow and be fed back under higher pressure, and orderly cools the upper-forming forced-cooling insert, the lower-forming forced-cooling insert and other cooling devices after the mold filling is completed, the casting quality of the truck hub casting is more uniform and stable, and the quality performance consistency is better.
Preferably, the temperature of the aluminum liquid in the low-pressure machine heat preservation furnace is 690 +/-10 ℃.
In the scheme, the temperature of the aluminum liquid in the holding furnace is 690 +/-10 ℃, the initial temperature of all the aluminum liquid is basically consistent, the flowability of the aluminum liquid is basically consistent, the heat carried by the aluminum liquid is basically consistent, and the flow rate and the cooling of the aluminum liquid in the mold filling process of the hub cavity of the truck are basically consistent.
And in the low-pressure casting process, the temperature of aluminum liquid between the upper mold core and the lower mold core is controlled to be 640 +/-30 ℃.
In the scheme, in order to ensure that the cooling speed of the mold is basically consistent under different weather conditions, a U-shaped ring groove is processed on the back surface of the upper mold core, an electric heating tube and a thermocouple are arranged, and the temperature of the upper mold core heated by the electric heating tube is controlled by the thermocouple; processing an annular groove on the back of the lower mold core, arranging an electric heating tube and a thermocouple, and controlling the temperature of the electric heating tube for heating the lower mold core through the thermocouple; therefore, the molten aluminum between the upper mold core and the lower mold core is kept in a liquid state at 640 +/-30 ℃, the molten aluminum conveniently flows back to the heat preservation furnace through the liquid lifting pipe when the heat preservation furnace of the low-pressure casting machine is depressurized, a cavity is formed between the upper mold core and the lower mold core, the aluminum quantity occupied by a sprue and a riser of a hub casting of the truck is reduced, the utilization rate of the molten aluminum is effectively improved, and the machining allowance, the machining time and the machining cost of the hub are further reduced.
Preferably, the surface temperature of the insert of the upper molding strong cold insert is controlled to be 310 +/-10 ℃ before the molten aluminum filling type wheel hub cavity of the truck.
In the scheme, after the last truck hub casting is demoulded, the temperature of the whole mould is greatly reduced, the upper forming forced cooling insert is deep into the truck hub cavity and is an independent insert, the cooling speed is higher, a certain temperature difference exists between the upper forming forced cooling insert and other parts of the upper mould, in the filling process, if the insert surface temperature of the upper forming forced cooling insert is too low, the flowing of aluminum liquid can be influenced, the quality of the inner part of the filling and truck hub casting is reduced, the insert surface temperature of the upper forming forced cooling insert is controlled to be 310 +/-10 ℃ before the aluminum liquid is filled into the truck hub cavity, the rapid cooling of the aluminum liquid can be avoided to a large extent, the temperature and the flow rate of the aluminum liquid are ensured, and the filling is smoothly completed according to the technological requirements.
Preferably, the surface temperature of the insert of the lower molding strong cold insert is controlled to be 335 +/-15 ℃ before the molten aluminum fills the hub cavity of the truck.
In the scheme, after the previous truck hub casting is demoulded, the temperature of the whole mould is greatly reduced, the lower-forming forced cooling insert is deep into the truck hub cavity and is an independent insert, the cooling speed is higher, and a certain temperature difference is formed between the lower mould and other parts of the lower mould, in the mold filling process, the aluminum liquid flows out from the pouring gate and flows through the lower mold core and the lower molding forced cooling insert firstly, if the insert surface temperature of the lower molding forced cooling insert is too low, the aluminum liquid flow is influenced, the internal quality of the mold filling and clamping wheel hub casting is reduced, the insert surface temperature of the lower molding forced cooling insert is controlled to be 335 +/-15 ℃ before the aluminum liquid fills the mold clamping wheel hub cavity, the heat carried by the aluminum liquid can quickly heat the insert of the lower molding forced cooling insert to the temperature close to the aluminum liquid, the rapid cooling of the aluminum liquid can be avoided to a greater extent, the temperature and the flow velocity of the aluminum liquid are ensured, and the smooth completion of the mold filling according to the process requirements is ensured.
Preferably, the cooling water introduced into the cooling holes of the upper molding forced cooling insert and the lower molding forced cooling insert is high-pressure circulating pure water, and the water temperature of the cooling water is controlled to be 30 +/-3 ℃.
The initial temperature of the cooling water is controlled to be 30 +/-3 ℃, the difference of the initial water temperatures is avoided, the cooling effect on the die is different in the same time, the cooling process is basically consistent, and the casting quality of the truck hub casting is basically consistent.
Preferably, the cooling water introduced into the cooling holes of the upper molding forced cooling insert and the lower molding forced cooling insert is high-pressure circulating pure water, and the water pressure of the cooling water is controlled to be 0.55 +/-0.15 MPa.
In the scheme, the water pressure of the high-pressure circulating pure water is controlled to be 0.55 +/-0.15 MPa, the pure water can avoid rusting of the die and the water circulating pipeline and accumulation and blockage of dirt, the flow rate of water is ensured to be basically consistent, and the cooling effect is basically consistent.
Preferably, the cooling device further comprises a shunting cone cooling device, an upper die cooling device, a lower die cooling device and a side die cooling device, and when the shunting cone, the upper die, the lower die and the side die need to be properly cooled, the shunting cone cooling device, the upper die cooling device, the lower die cooling device and the side die cooling device can be started.
Compared with the prior art, the invention has the following beneficial effects:
according to the truck hub mounting disc bolt hole intensive cooling casting forming process, the upper forming intensive cooling insert and the lower forming intensive cooling insert are respectively arranged at the positions, corresponding to the hub mounting disc bolt holes, of the upper die and the lower die, and high-pressure circulating pure water is adopted for forced cooling in the sequential solidification process of a truck hub casting, so that the crystallization solidification structure of aluminum liquid at the positions of the hub mounting disc bolt holes is more compact, and the mechanical property of the material is more excellent.
The reinforced cooling casting forming process for the bolt holes of the truck hub mounting plate, provided by the invention, has the advantages that the electric heating tubes and the thermocouples are arranged in the upper mold core and the lower mold core, the temperature of aluminum liquid between the upper mold core and the lower mold core is heated and controlled to be 640 +/-30 ℃, so that the aluminum liquid between the upper mold core and the lower mold core is kept in a liquid state, the feeding to the mounting plate part of the truck hub casting is improved, the aluminum liquid is convenient to flow back to a heat preservation furnace during pressure relief, a cavity is formed between the upper mold core and the lower mold core, the utilization rate of the aluminum liquid is effectively improved, the requirements on the initial temperature of the surface of an insert of the mold, the water temperature of cooling water and the water pressure control are also provided, the truck hub is cast under the controlled and stable environmental condition, the manufacturing quality and the mechanical property of the truck hub casting are basically consistent, and the truck hub casting is superior to the conventional process casting.
Drawings
FIG. 1 is a schematic cross-sectional view of a hub casting mold using a truck hub mounting plate bolt hole cooling-enhanced casting molding process;
FIG. 2 is a top view of the truck hub casting;
FIG. 3 is a graph showing the four-stage pressurization and two-stage pressure maintaining process curves of the holding furnace of the low-pressure casting machine according to the present invention,
the scores in the figures are as follows: 1. the device comprises an upper die, 2, an upper die core, 3, a lower die, 4, a lower die core, 5, a side die, 6, a truck hub cavity, 7 pouring gates, 8, bolt holes, 9, an upper strong cooling device, 10, a lower strong cooling device, 11, an electric heating tube, 12, a thermocouple, 13 and a truck hub casting.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The reinforced cooling casting forming process of the truck hub mounting plate bolt hole provided by the invention is described below by referring to fig. 1 to 3, and the process is based on a truck hub casting mold which comprises an upper mold 1, an upper mold core 2, a lower mold 3, a lower mold core 4 and a side mold 5, wherein the upper mold 1, the upper mold core 2, the lower mold 3, the lower mold core 4 and the side mold 5 enclose a truck hub cavity 6, a pouring gate 7 on the lower mold 3 is communicated with a low-pressure machine holding furnace (not shown) filled with aluminum liquid, an upper forming forced cooling insert 9 is arranged at the position of the upper mold 1 corresponding to a truck hub casting 13 mounting plate bolt hole 8, a lower forming forced cooling insert 10 is arranged at the position of the lower mold 3 corresponding to a truck hub casting 13 mounting plate bolt hole 8, a U-shaped annular groove is processed at the back of the upper mold core 2, an electric heating tube 11 and a thermocouple 12 are arranged, an annular groove is processed at the back of the lower mold core 4, an electric heating tube 11 and a thermocouple 12 are arranged, and the temperature of the lower mold core 4 heated by the electric heating tube 11 is controlled by the thermocouple 12.
During low-pressure casting, the temperature of aluminum liquid in a low-pressure machine heat preservation furnace is controlled to be 690 +/-10 ℃, the mold is closed, the surface temperature of an insert of an upper forming forced cooling insert 9 is controlled to be 310 +/-10 ℃ before a molten aluminum filled type truck hub cavity 6, the surface temperature of an insert of a lower forming forced cooling insert 10 is controlled to be 335 +/-15 ℃ before the molten aluminum filled type truck hub cavity 6, four-section pressurization and two-section pressure preservation are adopted for the low-pressure casting machine heat preservation furnace, so that the molten aluminum in the heat preservation furnace is filled in the truck hub cavity 6 under the corresponding air pressure condition, and the molten aluminum is crystallized and solidified into a truck hub casting 13 under the set air pressure condition, and the specific technological parameters are as follows:
(1) the pressurizing air pressure of the section a-b is 220 +/-5 mbar, and the pressurizing time is 9 +/-2 s;
(2) the pressurizing pressure of the section b-c is 395 +/-5 mbar, and the pressurizing time is 25 +/-2 s;
(3) the pressurizing air pressure of the c-d section is 850 +/-5 mbar, and the pressurizing time is 11 +/-2 s;
(4) the pressure maintaining pressure of the d-e section is 850 +/-20 mbar, and the pressure maintaining time is 90 +/-10 s;
(4) the pressurizing air pressure of the e-f section is 1350 +/-15 mbar, and the pressurizing time is 15 +/-2 s;
(5) the pressure maintaining pressure of the f-g section is 1350 +/-50 mbar, and the pressure maintaining time is 120 +/-10 s;
(6) and after the pressure is maintained for 210 +/-20 s for two sections, the pressure is relieved, the vehicle is naturally cooled for 45 +/-5 s, and the die is opened to take out the truck hub casting 13.
In the process of the truck hub mounting disc bolt hole intensive cooling casting forming process, the forming forced cooling water cooling control process of the mounting disc bolt hole 8 is as follows:
the cooling water introduced into the cooling holes of the upper forming forced cooling insert 9 and the lower forming forced cooling insert 10 is high-pressure circulating pure water, the water temperature of the cooling water is controlled to be 30 +/-3 ℃, and the water pressure of the cooling water is controlled to be 0.55 +/-0.15 MPa; the water feeding time of the upper forming strong cold insert 9 is set to be 150 +/-20 s after the pressurization is started, the water feeding time lasts for 110 +/-10 s, and the water flow is 300 +/-10L/min; the water flowing time of the lower molding strong cold insert 10 is set to be 160 +/-20 s after the pressurization is started, the water flowing time lasts for 120 +/-10 s, and the water flowing speed is 300 +/-10L/min.
Further, in order to ensure that the cooling speed of the mold is basically consistent in different weathers, the electric heating tube 11 is controlled by the thermocouple 12 to heat, so that the temperature of the aluminum liquid between the upper mold core 2 and the lower mold core 4 is controlled to be in a liquid state of 640 +/-30 ℃, the aluminum liquid conveniently flows back to the heat preservation furnace through the liquid lifting tube when the heat preservation furnace of the low-pressure casting machine relieves the pressure, a cavity is formed between the upper mold core 2 and the lower mold core 4, the aluminum amount occupied by a sprue and a dead head of the wheel hub casting 13 is reduced, the utilization rate of the aluminum liquid is effectively improved, and further the machining allowance, the machining time and the machining cost of the wheel hub are also reduced.
The reinforced cooling casting forming process for the bolt holes of the truck hub mounting plate provided by the invention adopts four-section pressurization and two-section pressure maintaining processes for a low-pressure casting machine holding furnace, and the pressure maintaining is carried out at the d-e section to ensure that the rim part of the truck hub casting 13 is crystallized and solidified under lower pressure, so that the infiltration of molten aluminum into the mold closing gaps among 45-degree surfaces of the side mold 5, the upper mold 1, the lower mold 3 and the side mold 5 is reduced, the truck hub casting 13 has no obvious flash, and the subsequent processing cost of the truck hub casting 13 is reduced; after the upper forming strong cold insert 9 and the lower forming strong cold insert 10 are crystallized and solidified for a period of time under lower pressure, the water cooling of the upper forming strong cold insert 9 and the lower forming strong cold insert 10 is started, the cooling around the upper forming strong cold insert 9 and the lower forming strong cold insert 10 is accelerated, and the crystallization and solidification quality of the bolt hole 8 of the mounting plate and the surrounding parts is improved; and maintaining the pressure at the f-g section to crystallize and solidify the mounting disc part, the rim, the spoke and the like of the truck hub casting 13 under higher pressure, so that the flowing of the molten aluminum in the feeding channel is ensured, the feeding force of the liquid molten aluminum between the upper mold core 2 and the lower mold core 4 to the mounting disc and other parts is improved, and the crystallization and solidification quality of the whole truck hub casting 13 is improved.
The pressurization refers to a process of introducing dry compressed air with certain pressure into a holding furnace of a low-pressure casting machine to gradually increase the air pressure in the furnace from being lower than the set air pressure to reach the set air pressure; the 'pressure maintaining' of the invention refers to a process of introducing dry compressed air with certain pressure into a holding furnace of a low-pressure casting machine to maintain the air pressure in the furnace at a set air pressure.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (9)
1. The utility model provides a truck wheel hub mounting disc bolt hole intensive cooling casting forming technology which characterized in that:
the truck hub casting mould comprises an upper mould, an upper mould core, a lower mould core and a side mould, wherein the upper mould, the upper mould core, the lower mould core and the side mould enclose a truck hub cavity; an upper forming forced cooling insert is arranged at the position of the upper die, corresponding to the bolt hole of the hub mounting plate; a lower forming forced cooling insert is arranged at the part of the lower die, corresponding to the bolt hole of the hub mounting plate;
the truck hub mounting disc bolt hole reinforced cooling casting forming process is based on the truck hub casting mold and comprises the following steps: and (2) closing the die, inputting dry compressed air into a holding furnace of the low-pressure casting machine, and adopting four-section pressurization and two-section pressure maintaining processes to make the molten aluminum in the holding furnace fill the hub cavity of the truck under the set process conditions and make the molten aluminum crystallize and solidify into a hub casting of the truck under the second section pressure maintaining pressure, wherein the pressurization and pressure maintaining process parameters are as follows:
(1) the first section of pressurizing pressure is 220 +/-15 mbar, and the pressurizing time is 10 +/-4 s;
(2) the second section of pressurizing pressure is 395 +/-15 mbar, and the pressurizing time is 25 +/-5 s;
(3) the third stage of pressurizing pressure is 850 +/-30 mbar, and the pressurizing time is 11 +/-5 s;
(4) the first section of pressure maintaining pressure is 850 +/-30 mbar, and the pressure maintaining time is 90 +/-15 s;
(4) the fourth stage of pressurization has pressure of 1350 + -50 mbar and pressurization time of 15 + -5 s;
(5) the second section has a pressure maintaining pressure of 1350 +/-50 mbar and a pressure maintaining time of 120 +/-15 s;
(6) after the pressure is kept for 210 plus or minus 30s for two sections, the pressure is relieved, the vehicle is naturally cooled for 45 plus or minus 5s, the mold is opened to take out the truck hub casting,
in the process of the truck hub mounting disc bolt hole intensive cooling casting forming process, the mounting disc bolt hole forming intensive cooling water cooling control process comprises the following steps:
the water feeding time of the upper-forming strong cold insert is set to be 150 +/-20 s after the first-stage pressurization begins, the water feeding time lasts for 110 +/-10 s, and the water flow is 300 +/-30L/min;
the time for starting water flowing of the lower-forming strong cold insert is set to be 160 +/-20 s after the first-stage pressurization is started, the time lasts for 120 +/-20 s, and the water flow is 300 +/-30L/min.
2. The truck hub mounting plate bolt hole reinforced cooling casting molding process according to claim 1, characterized in that:
the pressurizing and pressure maintaining technological parameters of the truck hub mounting disc bolt hole reinforced cooling casting forming technology are as follows:
(1) the first section of pressurizing pressure is 220 +/-5 mbar, and the pressurizing time is 9 +/-2 s;
(2) the second section of pressurizing pressure is 395 +/-5 mbar, and the pressurizing time is 25 +/-2 s;
(3) the third stage of pressurization pressure is 850 +/-5 mbar, and the pressurization time is 11 +/-2 s;
(4) the first section of pressure maintaining pressure is 850 +/-20 mbar, and the pressure maintaining time is 90 +/-10 s;
(4) the fourth stage of pressurization pressure is 1350 +/-15 mbar, and the pressurization time is 15 +/-2 s;
(5) the second section has a pressure maintaining pressure of 1350 +/-50 mbar and a pressure maintaining time of 120 +/-10 s;
(6) and (4) after the pressure is maintained for 210 +/-20 s for two sections, the pressure is released, the automobile is naturally cooled for 45 +/-5 s, and the die is opened to take out the truck hub casting.
3. In the cooling-enhanced casting forming process of the bolt holes of the truck hub mounting disc, the cooling control of the forced cooling water for forming the bolt holes of the mounting disc is as follows:
the water feeding time of the upper-forming strong cold insert is set to be 150 +/-20 s after the first-stage pressurization begins, the water feeding time lasts for 110 +/-10 s, and the water flow is 300 +/-10L/min;
the time for starting water flowing of the lower-forming strong cold insert is set to be 160 +/-20 s after the first-stage pressurization is started, the time lasts for 120 +/-10 s, and the water flow is 300 +/-10L/min.
4. The truck hub mounting plate bolt hole reinforced cooling casting molding process as claimed in claim 1 or 2, wherein the temperature of the molten aluminum in the low-pressure heat preservation furnace is 690 +/-10 ℃.
5. The truck hub mounting plate bolt hole intensive cooling casting molding process of claim 1 or 2, characterized in that in a low-pressure casting process, the temperature of aluminum liquid between the upper mold core and the lower mold core is controlled to be 640 +/-30 ℃.
6. The truck hub mounting disc bolt hole intensive cooling casting molding process according to claim 1 or 2, characterized in that the insert surface temperature of the upper molding intensive cooling insert is controlled to be 310 ± 10 ℃ before the molten aluminum fills the truck hub cavity.
7. The truck hub mounting plate bolt hole intensive cooling casting molding process according to claim 1 or 2, characterized in that the insert surface temperature of the lower molding intensive cooling insert is controlled to be 335 ± 15 ℃ before the molten aluminum fills the truck hub cavity.
8. The truck hub mounting plate bolt hole intensive cooling casting molding process according to claim 1 or 2, characterized in that the cooling water introduced into the cooling holes of the upper molding intensive cooling insert and the lower molding intensive cooling insert is high-pressure circulating pure water, and the water temperature of the cooling water is controlled at 30 ± 3 ℃.
9. The truck hub mounting disc bolt hole intensive cooling casting molding process according to claim 1 or 2, characterized in that the cooling water introduced into the cooling holes of the upper molding intensive cooling insert and the lower molding intensive cooling insert is high-pressure circulating pure water, and the water pressure of the cooling water is controlled to be 0.55 ± 0.15 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111604981.7A CN114260437B (en) | 2021-12-25 | 2021-12-25 | Enhanced cooling casting molding process for bolt holes of truck hub mounting plate |
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| CN202111604981.7A CN114260437B (en) | 2021-12-25 | 2021-12-25 | Enhanced cooling casting molding process for bolt holes of truck hub mounting plate |
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| CN114260437A true CN114260437A (en) | 2022-04-01 |
| CN114260437B CN114260437B (en) | 2023-07-18 |
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| CN206536014U (en) * | 2017-03-19 | 2017-10-03 | 中信戴卡股份有限公司 | Low pressure casting wheel mold bottom die water cooling plant |
| CN107552766A (en) * | 2017-08-23 | 2018-01-09 | 安徽东星汽车部件有限公司 | A kind of high-strength vehicle chassis security aluminium alloy castings low-pressure casting process |
| CN109759563A (en) * | 2019-03-26 | 2019-05-17 | 佛山市灿东模具技术有限公司 | A kind of high-pressure fog cooling casting moulding process |
| CN109807308A (en) * | 2019-03-26 | 2019-05-28 | 佛山市灿东模具技术有限公司 | The auxiliary pressure casting mould of aluminium alloy |
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| JPH08243723A (en) * | 1995-03-06 | 1996-09-24 | Asahi Tec Corp | Low pressure casting device for wheel for vehicle |
| JP2002283035A (en) * | 2001-03-22 | 2002-10-02 | Topy Ind Ltd | Low pressure casting die cooling method, and device thereof |
| JP2003072302A (en) * | 2001-08-31 | 2003-03-12 | Hitachi Metals Ltd | Light alloy wheel for vehicle and its die for casting |
| CN101837443A (en) * | 2010-02-04 | 2010-09-22 | 保定市立中车轮制造有限公司 | Low-pressure casting process and device for aluminum alloy wheel by bilateral pouring |
| CN102463344A (en) * | 2010-11-10 | 2012-05-23 | 江苏凯特汽车部件有限公司 | Low-pressure cast aluminum-alloy wheel-casting sequential-solidification temperature-field compensating method |
| CN105583394A (en) * | 2016-03-08 | 2016-05-18 | 北京航空航天大学 | Sequential pressurization method after crystallization pressure keeping for metal mold low-pressure casting molding of aluminum alloy wheel |
| CN106825501A (en) * | 2017-02-27 | 2017-06-13 | 柳州阳科技有限公司 | Aluminium alloy wheel hub of vehicle low temperature casting technique |
| CN206536014U (en) * | 2017-03-19 | 2017-10-03 | 中信戴卡股份有限公司 | Low pressure casting wheel mold bottom die water cooling plant |
| CN107552766A (en) * | 2017-08-23 | 2018-01-09 | 安徽东星汽车部件有限公司 | A kind of high-strength vehicle chassis security aluminium alloy castings low-pressure casting process |
| CN109759563A (en) * | 2019-03-26 | 2019-05-17 | 佛山市灿东模具技术有限公司 | A kind of high-pressure fog cooling casting moulding process |
| CN109807308A (en) * | 2019-03-26 | 2019-05-28 | 佛山市灿东模具技术有限公司 | The auxiliary pressure casting mould of aluminium alloy |
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| CN114260437B (en) | 2023-07-18 |
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