Continuous aluminum profile extrusion die for multi-cavity ultra-thin-walled tube and upper and lower die closing method of continuous aluminum profile extrusion die

Abstract

The invention relates to the technical field of aluminum profile extrusion dies, in particular to a continuous aluminum profile extrusion die for a multi-cavity ultra-thin-walled tube and an upper and lower die closing method thereof.The continuous aluminum profile extrusion die comprises an upper die and a lower die, the lower end of the upper die is connected with the lower die through a pin hole and a positioning pin, and a disassembly groove is formed in the edge of the lower end of the upper die; a positioning table is fixedly connected between the bottoms of the pin holes; the positioning pin comprises a pin body, and an adjusting mechanism is installed on the inner side of the pin body through a driving mechanism. The pin body comprises a cylindrical shell, a hollow hole is formed in the upper end of the cylindrical shell, a bottom hole is formed in the bottom end of the cylindrical shell, and side square holes annularly distributed at equal intervals are formed in the outer side of the cylindrical shell. According to the multi-cavity ultra-thin-walled tube mold, after mold closing of the upper mold and the lower mold is about to be completed, the transverse pressure of the adjusting plate is utilized to make contact with the pin holes, positioning is achieved, pin abrasion caused by pulling and inserting can be effectively avoided, then deviation caused by mold closing of the upper mold and the lower mold can be avoided, and the quality of a multi-cavity ultra-thin-walled tube can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum profile extrusion dies, in particular to a continuous aluminum profile extrusion die for a multi-cavity ultra-thin wall tube and an upper and lower die closing method thereof. Background Art

[0002] The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes is a key tool in the field of precision engineering. It is specially used to produce aluminum profiles with complex cross-sections and ultra-thin wall thickness. The design and manufacture of this die need to consider the fluidity of the material, the wear resistance of the die material, and the efficiency of the cooling system to ensure the stability of the extrusion process and the accuracy of the final product. The high precision requirement of the mold means that it can be accurately formed under high pressure to meet the needs of complex industrial applications. Although there are challenges such as design complexity, cost-effectiveness and maintenance requirements, the performance and durability of the mold can be effectively improved by adopting advanced design technology, optimizing material selection and maintenance strategies, ensuring the high-quality production of aluminum profiles. This mold has broad application prospects in aerospace, high-speed trains, lightweight automobiles and other fields, and is one of the important technologies to promote the development of related industries. The upper die and lower die of continuous aluminum profile extrusion of multi-cavity ultra-thin wall tubes are clamped by pins. After repeated use, the edges of the pins will wear. If the wear positions of all the pins used for clamping the upper and lower dies are the same, the clamping of the upper and lower dies will be offset, which will affect the quality of the multi-cavity ultra-thin wall tubes produced again. Therefore, a continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes and an upper and lower clamping method thereof are proposed to address the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes and an upper and lower mold closing method thereof, so as to solve the problem that the upper and lower molds of the continuous aluminum profile extrusion of the multi-cavity ultra-thin wall tubes are closed by means of pins. After repeated use, the edges of the pins will be worn. If the wear positions of all the pins used for closing the upper and lower molds are the same, the closing of the upper and lower molds will be offset, thereby affecting the quality of the multi-cavity ultra-thin wall tubes produced again.

[0004] To achieve the above object, the present invention provides the following technical solutions: A continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes and an upper and lower mold closing method thereof, comprising an upper die and a lower die, wherein the lower end of the upper die is connected to the lower die through a pin hole and a locating pin, and a disassembly groove is provided on the edge of the lower end of the upper die; a locating platform is fixedly connected to the middle of the bottom of the pin hole; the locating pin comprises a pin body, and an adjustment mechanism is installed on the inner side of the pin body through a driving mechanism; the pin body comprises a column shell, a hollow hole is provided on the upper end of the column shell, a bottom hole is provided on the bottom end of the column shell, and side holes equidistantly distributed in an annular manner are provided on the outer side of the column shell; the adjustment mechanism comprises a circular plate, an adjustment plate is fixedly connected to the bottom end of the circular plate in an annular and equidistant manner, and an oblique groove is provided in the middle of one side of the adjustment plate close to the center point of the circular plate; the driving mechanism comprises a truncated cone block, a fixing ring and an elastic support rod are installed on the upper end of the truncated cone block, and a guide column is fixedly connected to the middle of the bottom end of the truncated cone block.

[0005] As a further optimization of the present invention, the column shell is fixedly connected to the circular plate through a hollow hole, one end of the adjustment plate is installed inside the side hole, the adjustment plate corresponds to the side hole one by one, and the adjustment plate is L-shaped.

[0006] As a further optimization of the present invention, the truncated cone block is tightly attached to the adjustment plate through the oblique groove, the bottom end of the guide column is slidably connected to the column shell through the bottom hole, the bottom edge of the guide column is arc-shaped, and the bottom end of the guide column is exposed on the outside of the column shell.

[0007] As a further optimization of the present invention, there are multiple elastic support rods, the elastic support rods are arranged in an arc shape, the upper and lower ends of the elastic support rods are fixedly connected with fixing rings, the fixing rings are parallel to each other, and the fixing rings are coaxial with the circular plate.

[0008] As a further optimization of the present invention, there are four pin holes and four positioning pins, the upper edge of the positioning platform fixedly connected in the middle of the bottom of the pin hole is arc-shaped, and the positioning platform and the guide column are coaxially arranged.

[0009] As a further optimization of the present invention, the diameters of the upper mold and the lower mold are equal, positioning ring grooves are provided on the middle outer sides of the upper mold and the lower mold, the upper mold and the lower mold are coaxially arranged, semicircular rods are installed inside the positioning ring grooves, and heating wires are installed inside the semicircular rods.

[0010] As a further optimization of the present invention, any opening and closing end of the semicircular rod is fixedly connected with a magnetic suction block, and any semicircular rod arranged inside the positioning ring groove is provided with two, and the closed ends of the two semicircular rods are rotatably connected by a hinge.

[0011] As a further optimization of the present invention, one end of the semicircular rod connected by a hinge is fixedly connected with a wire, the wire corresponds to the semicircular rod one by one, and the wire is electrically connected to the heating wire.

[0012] As a further optimized content of the present invention, the following steps are included: S1: heating the upper mold and the lower mold: installing a semicircular rod between the upper mold and the lower mold for heating. During the heating process, power is supplied to the heating wire through the wire to achieve heating of the upper mold and the lower mold; S2: Connect the upper mold and the lower mold through the pin hole and the positioning pin: insert the positioning pin into the pin hole. After the positioning pin enters the pin hole, the guide column contacts the positioning table, so that the guide column moves upward. The guide column moves upward, driving the round table block to move upward. During the upward movement of the round table block, the adjustment plate is synchronously extruded through the side hole through the oblique groove, so that the end of the adjustment plate away from the column shell is closely attached to the inner wall of the pin hole; S3: Remove the semicircular rod inside the positioning ring groove and connect it to the extrusion equipment: Remove the heating wire installed inside the positioning ring groove through the semicircular rod, complete the heating, and connect the upper mold and the lower mold to the extrusion equipment, and put it into the continuous aluminum profile extrusion process of multi-cavity ultra-thin wall tube.

[0013] As further optimized content of the present invention, among them: S11: preheating inspection: check whether there are cracks, burrs or foreign matter on the surface of the upper mold and the lower mold to ensure that the upper mold and the lower mold are in good condition; Check whether there are any residual aluminum chips or impurities in the upper and lower mold cavities, and clean them up; S12: Preheating equipment preparation: connect the semicircular rod with the upper mold and the lower mold to perform local rapid preheating; S13: Preheating temperature setting: Heat the upper and lower dies to 350℃~450℃. The specific temperature is determined according to the extruded aluminum alloy material: 6063 aluminum alloy profile: 350℃~400℃; 7075 high-strength aluminum alloy profile: 400℃~450℃; The heating rate is controlled at 50℃ / min to prevent rapid temperature rise from causing local stress concentration in the mold; S14: Insulation treatment: After the upper mold and the lower mold are heated to the target temperature, they are kept warm for 2 to 4 hours to ensure that the temperature inside and outside the mold is consistent; S15: Temperature balance check: Arrange thermocouples or infrared thermometers in the upper and lower mold cavities to monitor the temperature at different positions of the mold in real time to ensure that the temperature difference does not exceed ±10°C; S16: Constant temperature cooling: Before closing the mold, slowly cool the mold to 300℃~350℃. Air cooling is used to evenly cool the mold and ensure that the mold maintains a suitable working condition during the mold closing process.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by providing the positioning pins and pin holes, after the upper mold and the lower mold are about to be molded together, the lateral pressure of the adjustment plate can be used to contact the pin holes to achieve positioning, which can effectively avoid the wear of the column pins caused by plugging and unplugging, and further avoid the deviation of the upper mold and the lower mold when the mold is closed, and can effectively improve the quality of the multi-cavity ultra-thin wall tube; 2. In the present invention, the positioning table can limit the guide column and prevent dust or debris from entering the corners at the bottom of the pin hole during actual use of the mold, which is inconvenient to clean later and affects the processing efficiency. At the same time, dust or debris can be prevented from entering the corners at the bottom of the pin hole and affecting the tightness of the mold. 3. In the present invention, gradual heating and slow cooling reduce the temperature difference between the inside and outside of the mold, avoid cracks or deformation due to thermal expansion and contraction, and effectively avoid fatigue damage to the mold due to temperature shock in the early stage of extrusion, thereby extending the service life of the mold. The mold temperature is uniform, ensuring the consistency of the wall thickness of the extruded aluminum profile, reducing the wall thickness deviation, improving the stability of the profile quality, reducing the downtime caused by uneven cooling or heating of the mold, and improving the production stability and continuous extrusion capacity of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the structure at A in the middle; Figure 3 This is a schematic diagram of the positioning pin structure of the present invention; Figure 4 It is a schematic diagram of the column shell structure of the present invention; Figure 5 This is a schematic diagram of the structure of the adjustment mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the driving mechanism of the present invention; Figure 7 This is a schematic diagram of the installation position structure of the positioning platform of the present invention.

[0016] In the figure: 1. Upper mold; 2. Lower mold; 3. Pin hole; 4. Disassembly slot; 5. Positioning pin; 51, pin body; 511, column shell; 512, hollow hole; 513, side hole; 514, bottom hole; 52. adjustment mechanism; 521. circular plate; 522. adjustment plate; 523. oblique groove; 53. driving mechanism; 531. truncated cone block; 532. guide column; 533. fixing ring; 534. elastic support rod; 6. Semicircular rod; 7. Positioning ring groove; 8. Heating wire; 9. Magnetic block; 10. Positioning table; 11. Wire; 12. Hinge. DETAILED DESCRIPTION

[0017] See also Figure 1-7 , the present invention provides a technical solution: The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube and the upper and lower mold closing method thereof include an upper die 1 and a lower die 2, wherein the lower end of the upper die 1 is connected to the lower die 2 through a pin hole 3 and a positioning pin 5, and a disassembly groove 4 is provided at the lower edge of the upper die 1; a positioning platform 10 is fixedly connected to the middle of the bottom of the pin hole 3; the positioning pin 5 includes a pin body 51, and an adjustment mechanism 52 is installed inside the pin body 51 through a driving mechanism 53; the pin body 51 includes a column shell 511, and a hollow hole 512 is provided at the upper end of the column shell 511, and a hollow hole 512 is provided at the bottom of the column shell 511. A bottom hole 514 is provided at the end, and side holes 513 with equal spacing in an annular shape are provided on the outer side of the column shell 511; the adjustment mechanism 52 includes a circular plate 521, and an adjustment plate 522 is fixedly connected to the bottom end of the circular plate 521 in an annular shape and equal spacing, and an oblique groove 523 is provided in the middle of the adjustment plate 522 near the center point of the circular plate 521; the driving mechanism 53 includes a truncated cone block 531, and a fixing ring 533 and an elastic support rod 534 are installed on the upper end of the truncated cone block 531, and a guide column 532 is fixedly connected in the middle of the bottom end of the truncated cone block 531.

[0018] As a further technical solution of this solution, the column shell 511 is fixedly connected to the circular plate 521 through the hollow hole 512, one end of the adjustment plate 522 is installed inside the side hole 513, and the adjustment plate 522 corresponds to the side hole 513 one by one. The adjustment plate 522 is L-shaped. Through the above arrangement, the position of the adjustment plate 522 can be further limited; As a further technical solution of this scheme, the truncated cone block 531 is closely attached to the adjustment plate 522 through the oblique groove 523, and the bottom end of the guide column 532 is slidably connected to the column shell 511 through the bottom hole 514. The bottom edge of the guide column 532 is arc-shaped, and the bottom end of the guide column 532 is exposed outside the column shell 511. Through the above arrangement, the adjustment plate 522 can be stably controlled by the truncated cone block 531 to move; As a technical solution for further implementation of this scheme, multiple elastic support rods 534 are provided, and the elastic support rods 534 are arranged in an arc shape. The upper and lower ends of the elastic support rods 534 are fixedly connected with fixing rings 533, and the fixing rings 533 are parallel to each other, and the fixing rings 533 are coaxial with the circular plate 521. Through the above arrangement, after the upper mold 1 and the lower mold 2 are separated, the elastic support rods 534 can drive the guide pillars 532 to reset; As a technical solution for further implementation of this scheme, there are four pin holes 3 and four positioning pins 5, the upper edge of the positioning platform 10 fixedly connected to the middle of the bottom of the pin hole 3 is arc-shaped, and the positioning platform 10 and the guide column 532 are coaxially arranged. Through the above arrangement, the upper mold 1 and the lower mold 2 can be stably connected together; As a technical solution for further implementation of this solution, the diameters of the upper mold 1 and the lower mold 2 are equal, and a positioning ring groove 7 is provided on the middle outer side of the upper mold 1 and the lower mold 2. The upper mold 1 and the lower mold 2 are coaxially arranged, and a semicircular rod 6 is installed inside the positioning ring groove 7, and a heating wire 8 is installed inside the semicircular rod 6. Through the above arrangement, the heating wire 8 can be stably installed inside the positioning ring groove 7 for heating the upper mold 1 and the lower mold 2; As a technical solution for further implementation of this scheme, the opening and closing ends of any semicircular rod 6 are fixedly connected with a magnetic suction block 9, and any semicircular rod 6 arranged inside the positioning ring groove 7 is provided with two, and the closed ends of the two semicircular rods 6 are rotatably connected by a hinge 12. Through the above arrangement, the stability of the semicircular rod 6 installed inside the positioning ring groove 7 can be further improved; As a further technical solution of the present invention, one end of the semicircular rod 6 connected by the hinge 12 is fixedly connected with a wire 11, the wire 11 corresponds to the semicircular rod 6 one by one, and the wire 11 is electrically connected to the heating wire 8. Through the above arrangement, the stability of the device as a whole during use can be further improved; As a technical solution for further implementing the present scheme, the following steps are included: S1: heating the upper mold 1 and the lower mold 2: installing the semicircular rod 6 between the upper mold 1 and the lower mold 2 for heating, and during the heating process, supplying power to the heating wire 8 through the wire 11 to achieve heating of the upper mold 1 and the lower mold 2; S2: Connect the upper mold 1 and the lower mold 2 through the pin hole 3 and the positioning pin 5: insert the positioning pin 5 into the pin hole 3. After the positioning pin 5 enters the pin hole 3, the guide column 532 contacts the positioning platform 10, so that the guide column 532 moves upward. The guide column 532 moves upward, driving the truncated cone block 531 to move upward. In the process of the truncated cone block 531 moving upward, the adjustment plate 522 is synchronously squeezed through the side hole 513 through the oblique groove 523, so that the end of the adjustment plate 522 away from the column shell 511 is in close contact with the inner wall of the pin hole 3; S3: Remove the semicircular rod 6 inside the positioning ring groove 7 and connect it to the extrusion equipment: Remove the heating wire 8 installed inside the positioning ring groove 7 through the semicircular rod 6, complete the heating, and connect the upper mold 1 and the lower mold 2 to the extrusion equipment, and put it into the continuous aluminum profile extrusion process of multi-cavity ultra-thin wall tube.

[0019] S11: Inspection before preheating: Check whether there are cracks, burrs or foreign matter on the surface of the upper mold 1 and the lower mold 2 to ensure that the upper mold 1 and the lower mold 2 are in good condition; Check whether there are any residual aluminum chips or impurities in the cavities of upper mold 1 and lower mold 2, and clean them up; S12: Preheating equipment preparation: connecting the semicircular rod 6 with the upper mold 1 and the lower mold 2 for local rapid preheating; S13: Preheating temperature setting: Heat the upper die 1 and the lower die 2 to 350°C to 450°C. The specific temperature is determined according to the extruded aluminum alloy material: 6063 aluminum alloy profile: 350℃~400℃; 7075 high-strength aluminum alloy profile: 400℃~450℃; The heating rate is controlled at 50℃ / min to prevent rapid temperature rise from causing local stress concentration in the mold; S14: Insulation treatment: After the upper mold 1 and the lower mold 2 are heated to the target temperature, they are kept warm for 2 to 4 hours to ensure that the temperature inside and outside the mold is consistent; S15: Temperature balance check: Arrange thermocouples or infrared thermometers in the cavities of upper mold 1 and lower mold 2 to monitor the temperature at different positions of the mold in real time to ensure that the temperature difference does not exceed ±10°C; S16: Constant temperature cooling: Before closing the mold, slowly cool the mold to 300℃~350℃. Air cooling is used to evenly cool the mold and ensure that the mold maintains a suitable working condition during the mold closing process.

[0020] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A continuous aluminum profile extrusion die for a multi-cavity ultra-thin wall tube, comprising an upper die (1) and a lower die (2), characterized in that: The lower end of the upper mold (1) is connected to the lower mold (2) via a pin hole (3) and a positioning pin (5), and a disassembly groove (4) is provided on the edge of the lower end of the upper mold (1); A positioning platform (10) is fixedly connected to the middle of the bottom of the pin hole (3); The positioning pin (5) comprises a pin body (51), and an adjustment mechanism (52) is installed inside the pin body (51) via a driving mechanism (53); The pin body (51) comprises a column shell (511), the upper end of the column shell (511) is provided with a hollow hole (512), the lower end of the column shell (511) is provided with a bottom hole (514), and the outer side of the column shell (511) is provided with annular equidistantly distributed side holes (513); The adjustment mechanism (52) comprises a circular plate (521), the bottom end of the circular plate (521) is annularly and equidistantly fixedly connected with an adjustment plate (522), and a beveled groove (523) is provided in the middle of one side of the adjustment plate (522) close to the center point of the circular plate (521); The driving mechanism (53) comprises a truncated cone block (531), a fixing ring (533) and an elastic support rod (534) being mounted on the upper end of the truncated cone block (531), and a guide column (532) being fixedly connected to the middle of the bottom end of the truncated cone block (531).

2. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube according to claim 1, characterized in that: The column housing (511) is fixedly connected to the circular plate (521) via the hollow hole (512); one end of the adjustment plate (522) is installed inside the side hole (513); the adjustment plate (522) corresponds to the side hole (513) in a one-to-one manner; and the adjustment plate (522) is L-shaped.

3. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube according to claim 1, characterized in that: The truncated cone block (531) is tightly attached to the adjustment plate (522) via the oblique groove (523); the bottom end of the guide column (532) is slidably connected to the column shell (511) via the bottom hole (514); the bottom edge of the guide column (532) is arc-shaped; the bottom end of the guide column (532) is exposed outside the column shell (511).

4. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube according to claim 1, characterized in that: A plurality of elastic support rods (534) are provided, and the elastic support rods (534) are arranged in an arc shape. The upper end and the lower end of the elastic support rod (534) are fixedly connected to a fixing ring (533), the fixing rings (533) are parallel to each other, and the fixing ring (533) and the circular plate (521) are coaxial.

5. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube according to claim 1, characterized in that: Four pin holes (3) and four positioning pins (5) are provided, the upper edge of a positioning platform (10) fixedly connected to the middle of the bottom of the pin hole (3) is arc-shaped, and the positioning platform (10) and the guide column (532) are coaxially arranged.

6. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tube according to claim 1, characterized in that: The diameters of the upper mold (1) and the lower mold (2) are equal; a positioning ring groove (7) is provided on the middle outer side of the upper mold (1) and the lower mold (2); the upper mold (1) and the lower mold (2) are coaxially arranged; a semicircular rod (6) is installed inside the positioning ring groove (7); and a heating wire (8) is installed inside the semicircular rod (6).

7. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes according to claim 6, characterized in that: The open and closed ends of any of the semicircular rods (6) are fixedly connected to a magnetic attraction block (9), and two semicircular rods (6) are arranged inside any of the positioning ring grooves (7), and the closed ends of the two semicircular rods (6) are rotatably connected via a hinge (12).

8. The continuous aluminum profile extrusion die for multi-cavity ultra-thin wall tubes according to claim 6, characterized in that: One end of the semicircular rod (6) connected by a hinge (12) is fixedly connected to a wire (11), the wire (11) and the semicircular rod (6) correspond one to one, and the wire (11) and the heating wire (8) are electrically connected.

9. The upper and lower mold clamping method of the continuous aluminum profile extrusion die of the multi-cavity ultra-thin wall tube according to any one of claims 1 to 8 is characterized in that: The following steps are involved: S1: heating the upper mold (1) and the lower mold (2): installing a semicircular rod (6) between the upper mold (1) and the lower mold (2) for heating. During the heating process, power is supplied to the heating wire (8) via the wire (11) to achieve heating of the upper mold (1) and the lower mold (2); S2: connecting the upper mold (1) and the lower mold (2) through the pin hole (3) and the positioning pin (5): inserting the positioning pin (5) into the pin hole (3). After the positioning pin (5) enters the pin hole (3), the guide column (532) contacts the positioning platform (10), thereby causing the guide column (532) to move upward. The guide column (532) moves upward, driving the truncated cone block (531) to move upward. During the upward movement of the truncated cone block (531), the adjustment plate (522) is synchronously extruded through the inside of the side hole (513) through the oblique groove (523), thereby causing the end of the adjustment plate (522) away from the column shell (511) to be in close contact with the inner wall of the pin hole (3); S3: Remove the semicircular rod (6) inside the positioning ring groove (7) and connect it to the extrusion equipment: Remove the heating wire (8) installed inside the positioning ring groove (7) through the semicircular rod (6), complete the heating, and connect the upper mold (1) and the lower mold (2) to the extrusion equipment to start the continuous aluminum profile extrusion process of the multi-cavity ultra-thin wall tube.

10. The upper and lower mold clamping method of a continuous aluminum profile extrusion die for a multi-cavity ultra-thin wall tube according to claim 9, characterized in that: S11: Inspection before preheating: Check whether there are cracks, burrs or foreign matter on the surface of the upper mold (1) and the lower mold (2), and ensure that the upper mold (1) and the lower mold (2) are in good condition; Check whether there is any residual aluminum chips or impurities in the cavities of the upper mold (1) and the lower mold (2), and clean them up; S12: Preheating equipment preparation: connecting the semicircular rod (6) to the upper mold (1) and the lower mold (2) to perform local rapid preheating; S13: Preheating temperature setting: Heat the upper die (1) and the lower die (2) to 350°C to 450°C. The specific temperature is determined according to the extruded aluminum alloy material: 6063 aluminum alloy profile: 350℃~400℃; 7075 high-strength aluminum alloy profile: 400℃~450℃; The heating rate is controlled at 50℃ / min to prevent rapid temperature rise from causing local stress concentration in the mold; S14: heat preservation treatment: after the upper mold (1) and the lower mold (2) are heated to the target temperature, they are kept warm for 2 to 4 hours to ensure that the temperature inside and outside the molds are consistent; S15: Temperature balance check: thermocouples or infrared thermometers are arranged in the cavities of the upper mold (1) and the lower mold (2) to monitor the temperature at different positions of the mold in real time to ensure that the temperature difference does not exceed ±10°C; S16: Constant temperature cooling: Before closing the mold, slowly cool the mold to 300℃~350℃. Air cooling is used to evenly cool the mold and ensure that the mold maintains a suitable working condition during the mold closing process.

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