Manufacturing method of aluminum alloy door and window profile

Abstract

The application discloses a manufacturing method for aluminum alloy door and window profiles, and relates to the technical field of aluminum profile processing.The manufacturing method comprises an extrusion cylinder, an upper die and a lower die which are installed on an extrusion machine body, a liquid nitrogen spraying device for cooling a discharge port of the lower die is arranged on the extrusion cylinder, and the extrusion cylinder, the upper die and the lower die are internally provided with a cooling pipe network which is in communication.The liquid nitrogen filling device is arranged to make liquid nitrogen flow through the inner walls of the extrusion cylinder and the upper die through a first cooling main channel, a first inlet channel, a second cooling main channel, a first cooling branch channel, a central cooling cavity, a second cooling branch channel, a third cooling main channel, a first outlet channel, a third outlet channel and a fifth cooling main channel, so that the extrusion cylinder and the upper die are cooled through heat conduction, the temperature of the inner cavity of the extrusion cylinder and the branch outlet of the upper die is prevented from being too high, the profile is prevented from being subjected to heat and then being subjected to mechanical property decline, surface oxidation change or even intense heat, and the production qualified rate of the aluminum profile is ensured.

Description

A manufacturing method for aluminum alloy door and window profiles Technical Field

[0001] This invention relates to the field of aluminum profile processing technology, and in particular to a manufacturing method for aluminum alloy door and window profiles. Background Technology

[0002] Aluminum alloy doors and windows refer to doors and windows made of aluminum alloy extruded profiles as frames, mullions, and sashes. Aluminum alloy profiles have high strength, high elongation, good ductility and formability, and good corrosion resistance.

[0003] Aluminum profiles are formed by extruding material using a die with a specific structural design. During the aluminum profile extrusion process, the extrusion bar forces a preheated aluminum ingot from the extrusion cylinder into the die, where it is finally shaped through the die's working belt. The high heat generated during this process due to metal deformation and friction is transferred to the profile and the die, reaching its maximum at the die exit. The faster the extrusion speed, the higher the temperature rises. This high temperature can cause a decrease in the mechanical properties of the profile, surface oxidation, and even thermal cracking.

[0004] For example, Chinese patent CN107042245B discloses an isothermal extrusion process for aluminum profiles using a pseudo-diversion die, which includes the following steps: (1) setting up an extruder and preheating the extrusion cylinder to 440℃~450℃; (2) setting up an extrusion die and preheating the extrusion die to 470℃~480℃; (3) uniformly heating the aluminum rod to 500℃~510℃ in a heating furnace, and adding a preheating furnace at the outlet of the heating furnace; (4) feeding the aluminum rod treated in the preheating furnace into the extrusion cylinder of the extruder for extrusion; (5) extruding at a constant speed during the extrusion process, and extruding the semi-finished profile from the empty blade; (6) cooling the die outlet by spraying liquid nitrogen to cool it to room temperature and then performing an effective treatment. The isothermal extrusion process of the present invention has the advantages of stable aluminum profile forming, extrusion forming, and high processing effect; the aluminum profiles produced have good quality, high pass rate, and low production cost, which effectively improves the economic benefits of enterprises.

[0005] Although the above-mentioned device cools the material by spraying liquid nitrogen at the mold outlet, in the actual production process of aluminum profiles, the high heat generated by the deformation and friction of the metal is transferred to the profile and the mold, resulting in high temperatures in both the upper mold of the shunting mold and the extrusion cylinder. This method can only cool the lower mold of the shunting mold. Furthermore, due to the large thickness of the aluminum profile extrusion mold, the upper mold of the shunting mold cannot be cooled in a timely and effective manner through heat conduction. As a result, the high temperature in the mold cavity of the upper mold of the shunting mold cannot be dealt with in time, which leads to a decrease in the mechanical properties of the heated profile, surface oxidation, or even overheating, affecting the production qualification rate of the aluminum profile. Therefore, this application provides a manufacturing method for aluminum alloy door and window profiles to meet the requirements. Summary of the Invention

[0006] The purpose of this application is to provide a manufacturing method for aluminum alloy door and window profiles. By setting up a cooling pipe network, liquid nitrogen is injected through a liquid nitrogen filling device, which flows through the first cooling main channel, the first inlet channel, the second cooling main channel, the first cooling branch channel, the central cooling chamber, the second cooling branch channel, the third cooling main channel, the first outlet channel, the third outlet channel, and the fifth cooling main channel into the inner wall of the extrusion cylinder and the upper die. The extrusion cylinder and the upper die are cooled by heat conduction, which avoids the temperature of the inner cavity of the extrusion cylinder and the branch outlet of the upper die being too high. This prevents the profile from experiencing a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of the aluminum profile.

[0007] To achieve the above objectives, this application provides the following technical solution: a manufacturing method for aluminum alloy door and window profiles, comprising the following steps:

[0008] S1. Aluminum rod casting: First, the aluminum ingot is heated to a certain temperature to melt it, and then the molten aluminum is poured into a casting machine to cast aluminum rods.

[0009] S2, Aluminum alloy extrusion: Based on the cross-sectional design of the profile product, the mold is manufactured, and the heated round cast rod is extruded from the mold using an extruder;

[0010] S3, Aluminum alloy strengthening: Homogenize the extruded aluminum rod, hot shear extrusion, and then quench it;

[0011] S3. Aluminum alloy profile forming: The aluminum alloy profiles after S2 extrusion are straightened using a straightening hydraulic press and then placed in an aging furnace for aging treatment.

[0012] S4. Aluminum alloy profile oxidation treatment: After inspecting the aluminum alloy profile material, the aluminum profile is degreased, washed with water, alkali etched, washed with water, neutralized, washed with water, oxidized, sealed, and dried before being taken off the production line.

[0013] When manufacturing aluminum alloy door and window profiles using the above steps, aluminum alloy door and window profile extrusion equipment is also involved, including an extrusion cylinder, an upper die, and a lower die installed on the extrusion press body. The extrusion cylinder is equipped with a liquid nitrogen spraying device for cooling the discharge port of the lower die. A connected cooling pipe network is installed inside the extrusion cylinder, the upper die, and the lower die. Liquid nitrogen is injected into the cooling pipe network to cool and lower the temperature of the extrusion cylinder, the upper die, and the lower die. A first cavity adapted to the shape of the empty cutting edge is opened in the lower die. The first cavity is filled with gas. Multiple second inlets are opened in the lower die. Multiple throughlets are opened in the lower die and connected to the first cavity. The cooling network includes a first chute; the cooling pipe network includes multiple third inlets and third outlets formed within the upper die, and multiple second chutes are formed within the cooling pipe network that penetrate the third outlets and communicate with the third inlets; both the first chute and the second chute are provided with stop / go components, which are used to control the flow of the cooling pipe network between the upper die and the lower die; the cooling pipe network includes multiple first main cooling channels and multiple fifth main cooling channels formed within the extrusion cylinder, and a second main cooling channel, multiple first inlets, and multiple first outlets are formed within the upper die, the first main cooling channels being connected to the first inlets, and the first inlets being connected to the second main cooling channels. The upper mold is further provided with a plurality of first cooling channels and a plurality of second cooling channels, the number of which corresponds to the number of flow outlets in the upper mold. The first cooling channels are connected to the second main cooling channels. The ends of the plurality of first cooling channels away from the second main cooling channels are connected to the same central cooling cavity. The ends of the plurality of second cooling channels close to each other are connected to the central cooling cavity. The upper mold is provided with a third main cooling channel. The ends of the plurality of second cooling channels away from the central cooling cavity are connected to the third main cooling channel. The third main cooling channel is connected to the first outlet channel. The lower mold is provided with a fourth main cooling channel and a plurality of second outlet channels. The fourth cooling main channel is adapted to the cutting edge shape of the lower mold. The first outlet channel is connected to the second inlet channel. The ends of the multiple first outlet channels that are close to each other are connected to the fourth cooling main channel. The ends of the multiple second outlet channels that are close to each other are connected to the fourth cooling main channel. The ends of the multiple second outlet channels that are far apart from each other are connected to the third inlet channel. The third inlet channel is connected to the third outlet channel. The third outlet channel is connected to the fifth cooling main channel. The end of the first cooling main channel that is far away from the first inlet channel is connected to the cooling medium outlet of the cooling device. The end of the fifth cooling main channel that is far away from the third outlet channel is connected to the cooling medium inlet of the cooling device.

[0014] Preferably, the stop / go component includes a first column that is slidably sleeved in the first groove, a first spring that is fixedly connected to one end of the first column away from the axis of the lower mold, and a first through hole that is provided on the first column. A second column is slidably sleeved in the second groove, a second spring that is fixedly connected to one end of the second column away from the axis of the upper mold, and a second through hole and a third through hole that are provided on the second column.

[0015] Preferably, the cross-section of the third through hole is L-shaped.

[0016] Preferably, a plurality of the first cooling channels and the second cooling channels are evenly arranged in a circumferential pattern within the upper mold.

[0017] Preferably, the central cooling cavity is located in the middle of the upper mold.

[0018] Preferably, two circuit breaks are provided on the second cooling main channel.

[0019] Preferably, a spiral section is provided on the first cooling main channel, and the spiral section is located on the side of the extrusion cylinder near the upper die.

[0020] Preferably, the spiral section is located on the side of the fifth cooling main channel near the axis of the extrusion cylinder.

[0021] Preferably, multiple pins are fixedly connected to the same side of the upper mold and the lower mold. The multiple pins on the upper mold are coaxial with the multiple first inlets and the multiple third outlets, respectively, and the multiple pins on the lower mold are coaxial with the multiple second inlets and the multiple second outlets, respectively.

[0022] Preferably, the outer diameter of the pin tube is adapted to the inner diameter of the first outlet, the third inlet, the first main cooling channel, and the fifth main cooling channel.

[0023] In summary, the technical effects and advantages of this invention are as follows:

[0024] 1. The present invention has a reasonable structure. By setting up a cooling pipe network, when the upper die continues to heat up due to metal deformation and friction during long-term operation of the extruder, liquid nitrogen can be injected through a liquid nitrogen injection device to flow through the first cooling main channel, the first inlet channel, the second cooling main channel, the first cooling branch channel, the central cooling chamber, the second cooling branch channel, the third cooling main channel, the first outlet channel, the third outlet channel, and the fifth cooling main channel into the inner wall of the extrusion cylinder and the upper die. The extrusion cylinder and the upper die are cooled by heat conduction, which avoids the temperature of the inner cavity of the extrusion cylinder and the branch port of the upper die being too high. This prevents the profile from experiencing a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0025] 2. In this invention, by setting a stop-and-go component, when the cutting edge of the lower die heats up rapidly due to metal deformation and friction, the gas in the first cavity expands due to heat, causing the first column to slide and compress the first spring. The slidable first column connects the second inlet and the first outlet through the first through hole. At this time, liquid nitrogen in the third cooling main channel enters the fourth cooling main channel through the first outlet and the second inlet to cooperate with the liquid nitrogen cooling device to improve the cooling efficiency at the cutting edge of the lower die, and avoid the cutting edge of the lower die from heating up rapidly due to metal deformation and friction, so that the profile will not experience a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0026] 3. In this invention, by setting a first cooling channel and a second cooling channel that are compatible with the number of upper mold sprue outlets, the liquid nitrogen passing through the first cooling channel and the second cooling channel rapidly cools the sprue outlet position of the upper mold, reducing the temperature at the upper mold sprue outlet position and avoiding the decline in the production qualification rate of aluminum profiles due to excessively high temperature at the upper mold sprue outlet position.

[0027] 4. In this invention, the cooling efficiency of the middle part of the upper mold is improved by setting a central cooling cavity in the middle part of the upper mold, reducing the cooling dead angle, and further improving the temperature reduction rate at the upper mold branch port, so as to avoid the production qualification rate of aluminum profiles being reduced due to excessively high temperature at the upper mold branch port.

[0028] 5. In this invention, the pin tube facilitates the positioning of the extrusion cylinder, upper die, and lower die during installation. Simultaneously, the pin tube reduces liquid nitrogen loss due to gaps between the extrusion cylinder, upper die, and lower die, preventing it from flowing through the first cooling main channel, first inlet channel, second cooling main channel, first cooling branch channel, central cooling chamber, second cooling branch channel, third cooling main channel, first outlet channel, second inlet channel, fourth cooling main channel, second outlet channel, third inlet channel, third outlet channel, and fifth cooling main channel. This ensures efficient utilization of liquid nitrogen, further reduces the cooling rate of the extrusion cylinder, upper die, and lower die, and minimizes mechanical property degradation, surface oxidation, and even overheating issues caused by heating the profile, thus guaranteeing the production qualification rate of the aluminum profile. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a three-dimensional structural diagram of the aluminum profile extruder and extrusion cylinder assembly;

[0031] Figure 2 is a three-dimensional enlarged structural diagram of the extrusion cylinder, upper die, and lower die assembly;

[0032] Figure 3 is a partial cross-sectional view of the extrusion cylinder, upper die, and lower die after assembly.

[0033] Figure 4 is a magnified structural diagram of point A in Figure 3;

[0034] Figure 5 is a three-dimensional enlarged schematic diagram of a partial cross-sectional view of the lower mold;

[0035] Figure 6 is a partial cross-sectional enlarged three-dimensional structural diagram of the second column;

[0036] Figure 7 is a schematic diagram of the enlarged three-dimensional structure of the lower mold;

[0037] Figure 8 is a schematic diagram of the enlarged three-dimensional structure of the upper mold;

[0038] Figure 9 is a three-dimensional enlarged schematic diagram of the cooling pipe network.

[0039] In the diagram: 1. Extrusion cylinder; 2. Upper die; 3. Lower die; 4. Cooling pipe network; 5. First main cooling channel; 6. First inlet channel; 7. Second main cooling channel; 8. First cooling branch channel; 9. Central cooling cavity; 10. Second branch channel; 11. Third main cooling channel; 12. First outlet channel; 13. Second inlet channel; 14. Fourth main cooling channel; 15. Second outlet channel; 16. Third inlet channel; 17. Circuit breaker; 18. Third outlet channel; 19. Fifth main cooling channel; 20. Spiral part; 21. Stop / go component; 22. First column; 23. First spring; 24. First through hole; 25. Second column; 26. Second spring; 27. Second through hole; 28. Third through hole; 29. ​​First cavity; 30. Pin tube. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example: Referring to Figures 1-9, a manufacturing method for aluminum alloy door and window profiles includes the following steps:

[0042] S1. Aluminum rod casting: First, the aluminum ingot is heated to a certain temperature to melt it, and then the molten aluminum is poured into a casting machine to cast aluminum rods.

[0043] S2, Aluminum alloy extrusion: Based on the cross-sectional design of the profile product, the mold is manufactured, and the heated round cast rod is extruded from the mold using an extruder;

[0044] S3, Aluminum alloy strengthening: Homogenize the extruded aluminum rod, hot shear extrusion, and then quench it;

[0045] S3. Aluminum alloy profile forming: The aluminum alloy profiles after S2 extrusion are straightened using a straightening hydraulic press and then placed in an aging furnace for aging treatment.

[0046] S4. Aluminum alloy profile oxidation treatment: After inspecting the aluminum alloy profile material, the aluminum profile is degreased, washed with water, alkali etched, washed with water, neutralized, washed with water, oxidized, sealed, and dried before being taken off the production line.

[0047] When manufacturing aluminum alloy door and window profiles using the above steps, aluminum alloy door and window profile extrusion equipment is also involved, including an extrusion cylinder 1, an upper die 2, and a lower die 3 installed on the extrusion press body. The extrusion cylinder 1 is equipped with a liquid nitrogen spray device for cooling the outlet of the lower die 3. Under normal conditions, the outlet of the lower die 3 can be cooled by the liquid nitrogen spray device to avoid the outlet temperature of the lower die 3 being too high, which would affect the product qualification rate of the aluminum profile. The extrusion cylinder 1, the upper die 2, and the lower die 3 are equipped with a connected cooling pipe network 4. Liquid nitrogen is injected into the cooling pipe network 4 to cool the extrusion cylinder 1, the upper die 2, and the lower die 3. The lower die 3 has a first cavity 29 that matches the shape of the empty knife edge. The first cavity 29 is filled with gas. The lower die 3 has multiple second inlets. The lower die 3 has multiple first grooves that penetrate the second inlet channel 13 and communicate with the first cavity 29. The cooling pipe network 4 includes multiple third inlet channels 16 and third outlet channels 18 in the upper die 2. The cooling pipe network 4 has multiple second grooves that penetrate the third outlet channels 18 and communicate with the third inlet channels 16. Both the first grooves and the second grooves are equipped with stop-and-go components 21, which are used to control the opening and closing of the cooling pipe network 4 between the upper die 2 and the lower die 3. The cooling pipe network 4 includes multiple first cooling main channels 5 and multiple fifth cooling main channels 19 in the extrusion cylinder 1. The upper die 2 has a second cooling main channel 7, multiple first inlet channels 6, and multiple first outlet channels 12. The first cooling main channels 5 are connected to the first inlet channels 6, and the first inlet channels 6 are connected to the first outlet channels 12. The second main cooling channel 7 is connected to the upper mold 2. The upper mold 2 also has several first cooling channels 8 and several second cooling channels 10, matching the number of branch outlets in the upper mold 2. The first cooling channels 8 are connected to the second main cooling channel 7. The ends of the first cooling channels 8 furthest from the second main cooling channel 7 are connected to the same central cooling cavity 9. The ends of the several second cooling channels 10 close to each other are connected to the central cooling cavity 9. The upper mold 2 has a third main cooling channel 11. The ends of the several second cooling channels 10 furthest from the central cooling cavity 9 are connected to the third main cooling channel 11. The third main cooling channel 11 is connected to the first outlet channel 12. The lower mold 3 has a fourth main cooling channel 14 and several second outlet channels 15. The fourth main cooling channel 14 is connected to the lower mold 3. The blade shape is adapted to the first outlet 12 and the second inlet 13 are connected. The ends of the multiple first outlets 12 that are close to each other are connected to the fourth cooling main channel 14. The ends of the multiple second outlets 15 that are close to each other are connected to the fourth cooling main channel 14. The ends of the multiple second outlets 15 that are far from each other are connected to the third inlet 16. The third inlet 16 is connected to the third outlet 18. The third outlet 18 is connected to the fifth cooling main channel 19. The end of the first cooling main channel 5 that is far from the first inlet 6 is connected to the cooling medium outlet of the cooling device. The end of the fifth cooling main channel 19 that is far from the third outlet 18 is connected to the cooling medium inlet of the cooling device. The cooling device can be a liquid nitrogen filling device in the prior art, used to fill liquid nitrogen into the first cooling main channel 5.

[0048] By setting up a cooling pipe network 4, when the extruder operates for a long time and the upper die 2 continues to heat up due to metal deformation and friction, liquid nitrogen can be injected through a liquid nitrogen injection device. Liquid nitrogen flows through the first cooling main channel 5, the first inlet channel 6, the second cooling main channel 7, the first cooling branch channel 8, the central cooling chamber 9, the second cooling branch channel 10, the third cooling main channel 11, the first outlet channel 12, the third outlet channel 18, and the fifth cooling main channel 19 into the inner wall of the extrusion cylinder 1 and the upper die 2. The heat conduction cools the extrusion cylinder 1 and the upper die 2, preventing the temperature in the inner cavity of the extrusion cylinder 1 and the branch outlet of the upper die 2 from being too high. This prevents the profile from experiencing a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0049] As shown in Figures 4-6, in this embodiment, the stop / stop component 21 includes a first column 22 that is slidably sleeved in the first groove. A first spring 23 is fixedly connected to one end of the first column 22 away from the axis of the lower mold 3. A first through hole 24 is provided on the first column 22. A second column 25 is slidably sleeved in the second groove. A second spring 26 is fixedly connected to one end of the second column 25 away from the axis of the upper mold 2. A second through hole 27 and a third through hole 28 are provided on the second column 25. The cross-section of the third through hole 28 is L-shaped.

[0050] By setting the stop component 21, when the cutting edge of the lower mold 3 heats up rapidly due to metal deformation and friction, the gas in the first cavity 29 expands due to heat, causing the first column 22 to slide and compress the first spring 23. After sliding, the first column 22 connects the second inlet 13 and the first outlet 12 through the first through hole 24. At this time, the liquid nitrogen in the third cooling main channel 11 enters the fourth cooling main channel 14 through the first outlet 12 and the second inlet 13 to cooperate with the liquid nitrogen cooling device to improve the cooling efficiency at the cutting edge of the lower mold 3, and avoid the cutting edge of the lower mold 3 from heating up rapidly due to metal deformation and friction, so that the profile will not experience a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0051] Simultaneously, the liquid nitrogen in the fourth cooling main channel 14 moves through the second outlet 15 to the third inlet 16 and rushes into the third through hole 28, causing the second column 25 to rise under force and squeeze the second spring 26 until one end of the third through hole 28 is connected to the third outlet 18. At this time, the movement path of the liquid nitrogen is the first cooling main channel 5, the first inlet 6, the second cooling main channel 7, the first cooling branch channel 8, the central cooling cavity 9, the second cooling branch channel 10, the third cooling main channel 11, the first outlet 12, the second inlet 13, the fourth cooling main channel 14, the second outlet 15, the third inlet 16, the third outlet 18, and the fifth cooling main channel 19, so as to simultaneously cool the extrusion cylinder 1, the upper die 2, and the lower die 3, reduce the temperature of the metal moving cavities in the extrusion cylinder 1, the upper die 2, and the lower die 3, and improve the utilization efficiency of liquid nitrogen.

[0052] It should be noted that when liquid nitrogen flows through the part of the cooling pipe network 4 located in the extrusion cylinder 1 and the upper mold 2, the liquid nitrogen flows through the second through hole 27 in the second column 25.

[0053] As shown in Figure 9, in this embodiment, several first cooling channels 8 and second cooling channels 10 are evenly arranged in a circumferential pattern within the upper mold 2. By setting first cooling channels 8 and second cooling channels 10 that are compatible with the number of flow outlets in the upper mold 2, the liquid nitrogen passing through the first cooling channels 8 and second cooling channels 10 rapidly cools the flow outlet positions of the upper mold 2, reducing the temperature at the flow outlet positions of the upper mold 2 and preventing the aluminum profile production qualification rate from decreasing due to excessively high temperatures at the flow outlet positions of the upper mold 2.

[0054] As shown in Figure 4, in this embodiment, the central cooling cavity 9 is located in the middle of the upper mold 2. The cooling efficiency of the middle of the upper mold 2 is improved by setting the central cooling cavity 9 in the middle of the upper mold 2, the cooling dead angle is reduced, and the temperature at the branch port of the upper mold 2 is further improved, so as to avoid the production qualification rate of aluminum profiles being reduced due to the excessive temperature at the branch port of the upper mold 2.

[0055] As shown in Figure 9, in this embodiment, two circuit breakers 17 are provided on the second cooling main channel 7 to avoid interference between the second cooling main channel 7 and the third outlet channel 18, which would affect the flow path of liquid nitrogen and thus reduce the cooling rate of the extrusion cylinder 1, the upper mold 2, and the lower mold 3.

[0056] As shown in Figure 9, in this embodiment, a spiral part 20 is provided on the first cooling main channel 5. The spiral part 20 is located on the side of the extrusion cylinder 1 near the upper die 2. The spiral part 20 increases the cooling speed of the side of the extrusion cylinder 1 near the upper die 2, thereby increasing the cooling speed of the extrusion cylinder 1 outlet and avoiding the decrease in the production qualification rate of aluminum profiles due to excessively high temperature at the extrusion cylinder 1 outlet.

[0057] As shown in Figure 9, in this embodiment, the spiral section 20 is located on the side of the fifth cooling main channel 19 near the axis of the extrusion cylinder 1. This arrangement enhances the influence of the spiral section 20, which first flows through liquid nitrogen at a lower temperature, on the inner cavity of the extrusion cylinder 1, thereby increasing the cooling rate of the inner cavity of the extrusion cylinder 1.

[0058] As shown in Figures 4, 7, and 8, in this embodiment, multiple pins 30 are fixedly connected to the same side of both the upper mold 2 and the lower mold 3. The pins 30 on the upper mold 2 are coaxial with multiple first inlets 6 and third outlets 18, respectively, while the pins 30 on the lower mold 3 are coaxial with multiple second inlets 13 and second outlets 15, respectively. The outer diameter of the pins 30 is adapted to the inner diameter of the first outlet 12, the third inlet 16, the first cooling main channel 5, and the fifth cooling main channel 19. The pins 30 facilitate positioning of the extrusion cylinder 1, the upper mold 2, and the lower mold 3 during installation, and also reduce flow to the extrusion cylinder 1, the upper mold 2, and the lower mold 3. The gap between the molds 3 causes liquid nitrogen to flow through the first cooling main channel 5, the first inlet channel 6, the second cooling main channel 7, the first cooling branch channel 8, the central cooling chamber 9, the second cooling branch channel 10, the third cooling main channel 11, the first outlet channel 12, the second inlet channel 13, the fourth cooling main channel 14, the second outlet channel 15, the third inlet channel 16, the third outlet channel 18, and the fifth cooling main channel 19. This ensures the utilization efficiency of liquid nitrogen, further reduces the cooling rate of the extrusion cylinder 1, the upper mold 2, and the lower mold 3, and reduces the mechanical property degradation, surface oxidation, and even overheating caused by the profile being heated, thus ensuring the production qualification rate of aluminum profiles.

[0059] Working principle of this invention:

[0060] By setting up a cooling pipe network, when the extruder operates for a long time and the upper die continues to heat up due to metal deformation and friction, liquid nitrogen can be injected through a liquid nitrogen injection device. Liquid nitrogen flows through the first main cooling channel, the first inlet channel, the second main cooling channel, the first cooling branch channel, the central cooling chamber, the second cooling branch channel, the third main cooling channel, the first outlet channel, the third outlet channel, and the fifth main cooling channel, circulating on the inner wall of the extrusion cylinder and the upper die. The heat conduction cools the extrusion cylinder and the upper die, preventing the temperature in the inner cavity of the extrusion cylinder and the branch outlet of the upper die from being too high. This avoids the profile from experiencing a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0061] By setting a stop-and-go component, when the cutting edge of the lower die heats up rapidly due to metal deformation and friction, the gas in the first cavity expands due to heat, causing the first column to slide and compress the first spring. The slidable first column connects the second inlet and the first outlet through the first through hole. At this time, liquid nitrogen in the third cooling main channel enters the fourth cooling main channel through the first outlet and the second inlet to cooperate with the liquid nitrogen cooling device to improve the cooling efficiency at the cutting edge of the lower die. This prevents the cutting edge of the lower die from heating up rapidly due to metal deformation and friction, which would otherwise cause the profile to experience a decrease in mechanical properties, surface oxidation, or even overheating after being heated, thus ensuring the production qualification rate of aluminum profiles.

[0062] Simultaneously, the liquid nitrogen in the fourth cooling main channel moves through the second exit channel to the third inlet channel and rushes into the third through hole, causing the second column to rise under force and squeeze the second spring until one end of the third through hole connects with the third exit channel. At this time, the movement path of the liquid nitrogen is: first cooling main channel, first inlet channel, second cooling main channel, first cooling branch channel, central cooling chamber, second cooling branch channel, third cooling main channel, first exit channel, second inlet channel, fourth cooling main channel, second exit channel, third inlet channel, third exit channel, and fifth cooling main channel, so as to simultaneously cool the extrusion cylinder, upper die, and lower die, reduce the temperature of the metal moving cavities in the extrusion cylinder, upper die, and lower die, and improve the utilization efficiency of liquid nitrogen.

[0063] It should be noted that when liquid nitrogen flows through the part of the cooling pipe network located in the extrusion cylinder and the upper mold, the liquid nitrogen flows through the second through hole in the second column.

[0064] By setting up a first cooling channel and a second cooling channel that are compatible with the number of upper mold sprue outlets, the liquid nitrogen passing through the first cooling channel and the second cooling channel can quickly cool the sprue outlets of the upper mold, reduce the temperature at the sprue outlets of the upper mold, and avoid the production qualification rate of aluminum profiles being reduced due to excessively high temperature at the sprue outlets of the upper mold.

[0065] The cooling efficiency of the upper mold is improved by setting a central cooling cavity in the middle of the upper mold, reducing the cooling dead zone, and further increasing the temperature reduction rate at the upper mold branch outlet, thus avoiding a decrease in the production qualification rate of aluminum profiles due to excessively high temperature at the upper mold branch outlet.

[0066] The spiral section increases the cooling rate of the extrusion cylinder near the upper die, thereby increasing the cooling rate of the extrusion cylinder outlet. This prevents the aluminum profile production yield from decreasing due to excessively high temperatures at the extrusion cylinder outlet. The spiral section is located on the side of the fifth cooling main channel near the extrusion cylinder axis. This design enhances the effect of the spiral section, which first flows through the lower-temperature liquid nitrogen, on the inner cavity of the extrusion cylinder, thereby increasing the cooling rate of the inner cavity of the extrusion cylinder.

[0067] By setting up pins, the positioning of the extrusion cylinder, upper die, and lower die during installation is facilitated. At the same time, the pins reduce the loss of liquid nitrogen caused by the gap between the extrusion cylinder, upper die, and lower die, which flows through the first cooling main channel, first inlet channel, second cooling main channel, first cooling branch channel, central cooling chamber, second cooling branch channel, third cooling main channel, first outlet channel, second inlet channel, fourth cooling main channel, second outlet channel, third inlet channel, third outlet channel, and fifth cooling main channel. This ensures the utilization efficiency of liquid nitrogen, further reduces the cooling rate of the extrusion cylinder, upper die, and lower die, and reduces the decrease in mechanical properties, surface oxidation, and even overheating caused by the profile being heated, thus ensuring the production qualification rate of aluminum profiles.

[0068] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing method for aluminum alloy door and window profiles, characterized in that, The process includes the following steps: S1, Aluminum rod casting: First, aluminum ingots are heated to a certain temperature to melt, then the molten aluminum is poured into a casting machine to cast aluminum rods; S2, Aluminum alloy extrusion: According to the cross-sectional design of the profile product, a mold is manufactured, and the heated round rod is extruded from the mold using an extrusion press; S3, Aluminum alloy strengthening: The extruded aluminum rods are homogenized, hot-sheared, and then quenched; S4, Aluminum alloy profile forming: A straightening hydraulic press is used to straighten the aluminum alloy profiles after S2 extrusion and place them into the machine. Aging treatment is carried out in an aging furnace; S5, aluminum alloy profile oxidation treatment: After inspecting the aluminum alloy profile material, the aluminum profile is degreased, washed with water, alkali etched, washed with water, neutralized, washed with water, oxidized, sealed, dried and then removed from the production line; When manufacturing aluminum alloy door and window profiles using the above steps, aluminum alloy door and window profile extrusion equipment is also involved, including an extrusion cylinder (1), an upper die (2), and a lower die (3) installed on the extrusion machine body. The extrusion cylinder (1) is equipped with a liquid nitrogen spraying device for cooling the discharge port of the lower die (3). The upper mold (2) and lower mold (3) are equipped with a connected cooling pipe network (4). Liquid nitrogen is injected into the cooling pipe network (4) to cool and reduce the temperature of the extrusion cylinder (1), the upper mold (2), and the lower mold (3). The lower mold (3) has a first cavity (29) that matches the shape of the empty knife edge. The first cavity (29) is filled with gas. The lower mold (3) has multiple second inlets (13). The lower mold (3) has multiple throughlets (13) that pass through the second inlets (13) and connect with the first inlet. The first slide groove is connected to the cavity (29); the cooling pipe network (4) includes multiple third inlet channels (16) and third outlet channels (18) opened in the upper mold (2), and multiple second slide grooves are opened in the cooling pipe network (4) that pass through the third outlet channels (18) and are connected to the third inlet channels (16); both the first slide groove and the second slide groove are provided with stop and stop components (21), and the stop and stop components (21) are used to control the opening and closing of the cooling pipe network (4) between the upper mold (2) and the lower mold (3);The cooling network (4) includes multiple first cooling main channels (5) and multiple fifth cooling main channels (19) opened in the extrusion cylinder (1). The upper mold (2) is provided with a second cooling main channel (7), multiple first inlet channels (6), and multiple first outlet channels (12). The first cooling main channels (5) are connected to the first inlet channels (6), and the first inlet channels (6) are connected to the second cooling main channels (7). The upper mold (2) is also provided with a number of first cooling branch channels (8) and a number of second cooling branch channels (10) adapted to the number of branch outlets of the upper mold (2). The first cooling branch channels (8) are connected to the second cooling main channels (7), and the number of first cooling branch channels (8) is far away from the extrusion cylinder (1). One end of the second main cooling channel (7) is connected to the same central cooling cavity (9). The ends of several second cooling branch channels (10) that are close to each other are connected to the central cooling cavity (9). A third main cooling channel (11) is provided in the upper mold (2). The ends of several second cooling branch channels (10) that are away from the central cooling cavity (9) are connected to the third main cooling channel (11). The third main cooling channel (11) is connected to the first outlet channel (12). A fourth main cooling channel (14) and several second outlet channels (15) are provided in the lower mold (3). The fourth main cooling channel (14) is adapted to the cutting edge shape of the lower mold (3). The first outlet channel (12) is connected to the second inlet channel (13). One end of each of the first outlet channels (12) is close to the other and connected to the fourth main cooling channel (14); one end of each of the second outlet channels (15) is close to the other and connected to the fourth main cooling channel (14); one end of each of the second outlet channels (15) is far from the other and connected to the third inlet channel (16); the third inlet channel (16) is connected to the third outlet channel (18); the third outlet channel (18) is connected to the fifth main cooling channel (19); one end of the first main cooling channel (5) away from the first inlet channel (6) is connected to the cooling medium outlet of the cooling device; one end of the fifth main cooling channel (19) away from the third outlet channel (18) is connected to the cooling medium inlet of the cooling device; the connection / stop The component (21) includes a first column (22) that is slidably sleeved in the first groove. A first spring (23) is fixedly connected to one end of the first column (22) away from the axis of the lower mold (3). A first through hole (24) is provided on the first column (22). A second column (25) is slidably sleeved in the second groove. A second spring (26) is fixedly connected to one end of the second column (25) away from the axis of the upper mold (2). A second through hole (27) and a third through hole (28) are provided on the second column (25). The cross-section of the third through hole (28) is L-shaped. Several first cooling channels (8) and second cooling channels (10) are evenly arranged in a circumferential manner in the upper mold (2).The central cooling chamber (9) is located in the middle of the upper mold (2); two circuit breakers (17) are provided on the second main cooling channel (7).

2. The manufacturing method for aluminum alloy door and window profiles according to claim 1, characterized in that: The first cooling main channel (5) is provided with a spiral part (20), which is located on the side of the extrusion cylinder (1) near the upper die (2); the spiral part (20) is located on the side of the fifth cooling main channel (19) near the axis of the extrusion cylinder (1).

3. The manufacturing method for aluminum alloy door and window profiles according to claim 1, characterized in that: Multiple pins (30) are fixedly connected to the same side of the upper mold (2) and the lower mold (3). The multiple pins (30) on the upper mold (2) are coaxial with the multiple first inlet channels (6) and the multiple third outlet channels (18), respectively. The multiple pins (30) on the lower mold (3) are coaxial with the multiple second inlet channels (13) and the multiple second outlet channels (15), respectively. The outer diameter of the pins (30) is adapted to the inner diameter of the first outlet channel (12), the third inlet channel (16), the first cooling main channel (5), and the fifth cooling main channel (19).

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