Liquid nitrogen cooling mold and its application

Abstract

The present invention discloses a liquid nitrogen cooling mold and its application, which belongs to the technical field of aluminum alloy extrusion, and comprises a lower mold: the lower mold is provided with a molding cavity; the lower mold is connected to an upper mold; a shunt bridge is connected to the middle end of the upper mold, and the end of the shunt bridge close to the lower mold is fixedly connected to a mold core used in conjunction with the molding cavity; a liquid spray cooling assembly is arranged in the mold core at equal intervals along the circumferential direction; a second liquid inlet assembly is installed at the end of the lower mold away from the upper mold; the lower mold and the upper mold are connected to a mold body cooling assembly, and the second liquid inlet assembly is communicated with the mold body cooling assembly; the mold body cooling assembly is installed with a first liquid inlet assembly; the lower mold is connected to a direction adjustment assembly for adjusting the flow direction of liquid nitrogen, and the direction adjustment assembly is communicated with the liquid spray cooling assembly and the mold body cooling assembly. Through the above-mentioned method, the present invention avoids micro-deformation due to overheating, prolongs the use of the lower mold, the upper mold, the molding cavity and the mold core, and at the same time, the workpiece after molding is quickly cooled by spraying from the liquid spray cooling assembly, thereby ensuring the molding quality.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy extrusion, and in particular to a liquid nitrogen cooling die and application thereof. Background Art

[0002] Aluminum alloy profiles used in aviation, automobiles, and motor vehicles are all extruded through aluminum alloy extrusion dies.

[0003] The invention with the publication number CN104772359B discloses an aluminum alloy extrusion die, comprising a die shell, an extrusion cavity arranged in the die shell, and a die bridge, wherein the die bridge is connected to the die shell to divide the extrusion cavity into N sub-extrusion cavities; the die bridge comprises a first outer wall and a second outer wall, and the longitudinal section of the die bridge comprises a first longitudinal section portion, wherein the first longitudinal section portion gradually narrows along the direction in which the fluid aluminum alloy is pushed into the extrusion, wherein, in the first longitudinal section portion, the angle between the first outer wall and the second outer wall is a first predetermined angle, and extends with a first predetermined length. The aluminum alloy extrusion die provided has a die bridge arranged in the feeding cavity, so that the fluid aluminum alloy is split by the die bridge, and the fluid aluminum alloy in the center of the feeding cavity is blocked and rubbed by the die bridge, so that it flows slowly during the extrusion process, balancing the flow rate of the center metal and the edge metal, and reducing the shrinkage tail.

[0004] However, the above-mentioned mold is not designed with a cooling structure. During molding, the mold will continue to rise with the extrusion molding. When the temperature is too high, it is easy to deform slightly due to the extrusion force, and the slight deformation will affect the quality of the workpiece.

[0005] Based on this, the present invention designs a liquid nitrogen cooling mold and its application to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a liquid nitrogen cooling mold and application thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A liquid nitrogen cooling mold, comprising a lower mold:

[0009] The lower mold is provided with a molding cavity;

[0010] The lower die is connected with the upper die;

[0011] A shunt bridge is connected to the middle end of the upper die, and a mold core used in conjunction with the molding cavity is fixedly connected to the end of the shunt bridge close to the lower die;

[0012] Liquid spray cooling components for cooling the molding cavity and the mold core, as well as the molded workpiece, are arranged at equal intervals along the circumferential direction in the mold core;

[0013] A second liquid inlet assembly for liquid nitrogen inlet is installed at the end of the lower mold away from the upper mold;

[0014] The lower mold and the upper mold are connected with a mold cooling assembly for cooling the lower mold and the upper mold, and the second liquid inlet assembly is communicated with the mold cooling assembly;

[0015] The mold cooling assembly is equipped with a first liquid inlet assembly for liquid nitrogen inlet;

[0016] The lower mold is connected to a direction adjustment component for adjusting the flow direction of liquid nitrogen, and the direction adjustment component is communicated with the liquid spray cooling component and the mold body cooling component. When the first liquid inlet component is fed with liquid, the flow direction of liquid nitrogen in the mold body cooling component is the lower mold, the upper mold, the direction adjustment component, and the liquid spray cooling component; when the direction adjustment component is adjusted backward and the first liquid inlet component is fed with liquid, the flow direction of liquid nitrogen in the mold body cooling component is the upper mold, the lower mold, the direction adjustment component, and the liquid spray cooling component.

[0017] Furthermore, the liquid spray cooling assembly includes an L-shaped cooling channel and an oblique spray channel. The L-shaped cooling channel is opened in the upper mold, the mold core and the diverter bridge. The end of the mold core away from the upper mold is provided with an oblique spray channel, and the oblique spray channel is communicated with the L-shaped cooling channel, and the L-shaped cooling channel is communicated with the direction adjustment assembly.

[0018] Furthermore, the mold body cooling assembly includes an outer mold, a guide cover, a first annular groove, a first transverse cooling channel, a U-shaped cooling channel and a second annular groove. The end of the lower mold away from the upper mold is fixedly connected to the guide cover, and the end of the guide cover close to the lower mold is provided with a second annular groove. U-shaped cooling channels are provided in the lower mold at equal intervals along the circumferential direction, and the first transverse cooling channels are provided in the upper mold at equal intervals along the circumferential direction. The first transverse cooling channel and the second annular groove are communicated with the U-shaped cooling channel. The end of the upper mold away from the lower mold is fixedly connected to the outer mold, and the end of the outer mold close to the lower mold is provided with a first annular groove, and the first annular groove is communicated with the first transverse cooling channel. The first liquid inlet assembly is connected to the guide cover, and the second liquid inlet assembly is communicated with the first annular groove.

[0019] Furthermore, the first liquid inlet assembly includes a first solenoid valve and a first liquid inlet pipe. The first liquid inlet pipe is fixedly mounted on the outer wall of the deflector cover. The first solenoid valve is mounted on the first liquid inlet pipe, and the first liquid inlet pipe is communicated with the second annular groove.

[0020] Furthermore, the direction adjustment component includes a sliding rod, a connecting frame, a cylinder, a second guide channel, a blocking column and a first guide channel. The end of the guide cover away from the upper mold is symmetrically fixedly connected to the cylinder, the output end of the cylinder is fixedly connected to the connecting frame, the connecting frame is fixedly connected to the sliding rod, the end of the slide rod away from the cylinder is fixedly connected to the blocking column, the lower mold and the upper mold are opened in the first guide channel, the first guide channel and the blocking column are fitted and slidably connected, the upper mold is opened at the end of the first guide channel away from the lower mold, the second guide channel is communicated with the first annular groove, the first guide channel is communicated with the second annular groove, the first guide channel is communicated with the L-shaped cooling channel, and when the blocking column is in fit and contact with the end of the first guide channel close to the upper mold, the left end of the blocking column is located at the right end of the liquid inlet end of the L-shaped cooling channel.

[0021] Furthermore, the diameter of the second guide channel is smaller than the diameter of the first guide channel.

[0022] Furthermore, the slide rod is slidably connected to the air deflector cover via a sealing ring.

[0023] Furthermore, the second liquid inlet assembly includes a second solenoid valve, a second liquid inlet pipe and a third guide channel. The end of the lower mold away from the upper mold is fixedly connected to the second liquid inlet pipe, and the second solenoid valve is fixedly connected to the second liquid inlet pipe. The third guide channel is opened in the lower mold and the upper mold, and the third guide channel is communicated with the second liquid inlet pipe.

[0024] Furthermore, the third guide channel is communicated with the first annular groove.

[0025] The invention discloses an application of a liquid nitrogen cooling die in the field of aluminum alloy extrusion.

[0026] The present invention has the following technical effects:

[0027] 1. The direction adjustment component of the present invention is in the original position, and liquid nitrogen enters the mold cooling component through the first liquid inlet component, and the liquid nitrogen first cools the lower mold and then the upper mold, and then enters the liquid spray cooling component through the direction adjustment component to cool the molding cavity and the mold core, and finally sprays out to perform liquid spray cooling on the molding formation; the direction adjustment component is in the adjustment position, and liquid nitrogen enters the mold cooling component through the second liquid inlet component, and the liquid nitrogen first cools the upper mold and then the lower mold, and then enters the liquid spray cooling component through the direction adjustment component to cool the molding cavity and the mold core, and finally sprays out to perform liquid spray cooling on the molding formation; in summary, it is convenient Cooling the lower die, upper die, molding cavity and mold core can avoid overheating of the lower die, upper die, molding cavity and mold core, and prevent them from micro-deformation due to overheating, thereby extending the use of the lower die, upper die, molding cavity and mold core. At the same time, the liquid spray cooling component can quickly cool the formed workpiece to ensure the molding quality. In addition, the direction adjustment component can adjust the flow direction of liquid nitrogen, and can adjust the lower die to cool the upper die first and then the upper die, or the upper die to cool the lower die first and then the lower die, which can avoid the lower die or the upper die being in the first cooling state all the time, which is beneficial for the lower die and the upper die to adjust the uniform temperature state, avoid the lower die and the upper die from always having a temperature difference, and is beneficial for actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 The liquid nitrogen cooling mold of the present invention is a three-dimensional Figure 1 ;

[0030] Figure 2 It is a front view of the liquid nitrogen cooling mold of the present invention;

[0031] Figure 3 It is a left view of the liquid nitrogen cooling mold of the present invention;

[0032] Figure 4 The liquid nitrogen cooling mold of the present invention is a three-dimensional Figure 2 ;

[0033] Figure 5 The liquid nitrogen cooling mold of the present invention is a three-dimensional Figure 3 ;

[0034] Figure 6 For along Figure 3 AA direction section Figure 1 ;

[0035] Figure 7 For along Figure 3BB direction cross section Figure 1 ;

[0036] Figure 8 For along Figure 3 CC direction cross-sectional view;

[0037] Fig. 9 For along Figure 3 AA direction section Figure 2 ;

[0038] Fig.10 For along Figure 3 BB direction cross section Figure 2 .

[0039] The numbers in the figure represent:

[0040] 1. Lower mold 2. Upper mold 3. Outer mold 4. Guide cover 5. Slide rod 6. Connecting frame 7. Cylinder 8. First solenoid valve 9. First liquid inlet pipe 10. Second solenoid valve 11. Second liquid inlet pipe 12. Molding cavity 13. Mold core 14. Diverter bridge 15. First annular groove 16. First transverse cooling channel 17. U-shaped cooling channel 18. Second annular groove 19. L-shaped cooling channel 20. Second guide channel 21. Blocking column 22. First guide channel 23. Oblique spray channel 24. Third guide channel. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention will be further described below in conjunction with the embodiments.

[0043] In some embodiments, see Figure 1-10 , a liquid nitrogen cooling mold, comprising a lower mold 1:

[0044] The lower mold 1 is provided with a molding cavity 12;

[0045] The lower die 1 is connected to the upper die 2;

[0046] A shunt bridge 14 is connected to the middle end of the upper mold 2, and a mold core 13 used in conjunction with the molding cavity 12 is fixedly connected to the end of the shunt bridge 14 close to the lower mold 1;

[0047] Liquid spray cooling components for cooling the molding cavity 12 and the mold core 13 and the molded workpiece are arranged at equal intervals along the circumferential direction in the mold core 13;

[0048] A second liquid inlet assembly for liquid nitrogen inlet is installed at the end of the lower mold 1 away from the upper mold 2;

[0049] The lower mold 1 and the upper mold 2 are connected with a mold cooling assembly for cooling the lower mold 1 and the upper mold 2, and the second liquid inlet assembly is in communication with the mold cooling assembly;

[0050] The mold cooling assembly is equipped with a first liquid inlet assembly for liquid nitrogen inlet;

[0051] The lower mold 1 is connected with a direction adjustment component for adjusting the flow direction of liquid nitrogen, and the direction adjustment component is communicated with the liquid spray cooling component and the mold body cooling component. When the first liquid inlet component is fed with liquid, the flow direction of liquid nitrogen in the mold body cooling component is the lower mold 1, the upper mold 2, the direction adjustment component, and the liquid spray cooling component; when the direction adjustment component is adjusted backward and the first liquid inlet component is fed with liquid, the flow direction of liquid nitrogen in the mold body cooling component is the upper mold 2, the lower mold 1, the direction adjustment component, and the liquid spray cooling component;

[0052] The direction adjustment component is in the original position, and the liquid nitrogen enters the mold cooling component through the first liquid inlet component. The liquid nitrogen first cools the lower mold 1 and then the upper mold 2. Then, the liquid nitrogen passes through the direction adjustment component and enters the liquid spray cooling component to cool the molding cavity 12 and the mold core 13. Finally, the liquid nitrogen is sprayed out to perform liquid spray cooling on the molding.

[0053] The direction adjustment component is in the adjustment position, and the liquid nitrogen enters the mold cooling component through the second liquid inlet component. The liquid nitrogen first cools the upper mold 2 and then the lower mold 1. Then, the liquid nitrogen passes through the direction adjustment component and enters the liquid spray cooling component to cool the molding cavity 12 and the mold core 13. Finally, the liquid nitrogen is sprayed out to perform liquid spray cooling on the molding.

[0054] In summary, it is convenient to cool the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13, which can avoid overheating of the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13, and avoid micro-deformation due to overheating, thereby extending the use of the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13. At the same time, the liquid spray cooling component sprays out to quickly cool the formed workpiece, thereby ensuring the molding quality; in addition, the direction adjustment component can adjust the flow direction of liquid nitrogen, and can adjust the lower mold 1 to cool the upper mold 2 first and then cool it, or the upper mold 2 to cool the lower mold 1 first and then cool it, which can avoid the lower mold 1 or the upper mold 2 being in a cooling state first, which is beneficial for the lower mold 1 and the upper mold 2 to adjust the uniform temperature state, avoid the lower mold 1 and the upper mold 2 always having a temperature difference, and is beneficial for actual use.

[0055] The liquid spray cooling assembly includes an L-shaped cooling channel 19 and an oblique spray channel 23. The L-shaped cooling channel 19 is opened in the upper mold 2, the mold core 13 and the diverter bridge 14. The end of the mold core 13 away from the upper mold 2 is provided with an oblique spray channel 23, and the oblique spray channel 23 is communicated with the L-shaped cooling channel 19, and the L-shaped cooling channel 19 is communicated with the direction adjustment assembly.

[0056] The mold body cooling assembly includes an outer mold 3, a guide cover 4, a first annular groove 15, a first transverse cooling channel 16, a U-shaped cooling channel 17 and a second annular groove 18. The end of the lower mold 1 away from the upper mold 2 is fixedly connected with the guide cover 4, and the end of the guide cover 4 close to the lower mold 1 is provided with a second annular groove 18. U-shaped cooling channels 17 are evenly spaced along the circumferential direction in the lower mold 1, and first transverse cooling channels 16 are evenly spaced along the circumferential direction in the upper mold 2. The first transverse cooling channel 16 and the second annular groove 18 are communicated with the U-shaped cooling channel 17. The end of the upper mold 2 away from the lower mold 1 is fixedly connected with the outer mold 3, and the end of the outer mold 3 close to the lower mold 1 is provided with a first annular groove 15, and the first annular groove 15 is communicated with the first transverse cooling channel 16. The first liquid inlet assembly is connected with the guide cover 4, and the second liquid inlet assembly is communicated with the first annular groove 15.

[0057] The first liquid inlet assembly includes a first solenoid valve 8 and a first liquid inlet pipe 9 . The first liquid inlet pipe 9 is fixedly mounted on the outer wall of the deflector 4 . The first solenoid valve 8 is mounted on the first liquid inlet pipe 9 , and the first liquid inlet pipe 9 is communicated with the second annular groove 18 .

[0058] The direction adjustment component includes a slide bar 5, a connecting frame 6, a cylinder 7, a second guide channel 20, a blocking column 21 and a first guide channel 22. The end of the guide cover 4 away from the upper mold 2 is symmetrically fixedly connected with the cylinder 7, the output end of the cylinder 7 is fixedly connected with the connecting frame 6, the connecting frame 6 is fixedly connected with the slide bar 5, the end of the slide bar 5 away from the cylinder 7 is fixedly connected with the blocking column 21, the lower mold 1 and the upper mold 2 are provided with the first guide channel 22, the first guide channel 22 is fitted and slidably connected with the blocking column 21, and the upper mold 2 is fixedly connected with the blocking column 21. A second guide channel 20 is opened at the end of the first guide channel 22 away from the lower mold 1. The diameter of the second guide channel 20 is smaller than the diameter of the first guide channel 22. The second guide channel 20 is communicated with the first annular groove 15, the first guide channel 22 is communicated with the second annular groove 18, and the first guide channel 22 is communicated with the L-shaped cooling channel 19. When the blocking column 21 is in contact with the end of the first guide channel 22 close to the upper mold 2, the left end of the blocking column 21 is located at the right end of the liquid inlet end of the L-shaped cooling channel 19.

[0059] The sliding rod 5 is slidably connected to the air deflector 4 via a sealing ring.

[0060] The second liquid inlet assembly includes a second solenoid valve 10, a second liquid inlet pipe 11 and a third guide channel 24. The end of the lower mold 1 away from the upper mold 2 is fixedly connected to the second liquid inlet pipe 11, and the second solenoid valve 10 is fixedly connected to the second liquid inlet pipe 11. The third guide channel 24 is opened in the lower mold 1 and the upper mold 2, and the third guide channel 24 is communicated with the second liquid inlet pipe 11, and the third guide channel 24 is communicated with the first annular groove 15.

[0061] The first liquid inlet pipe 9 and the second liquid inlet pipe 11 are connected to an external power liquid nitrogen source.

[0062] See also Figure 6-7 , the cylinder 7 of the steering assembly drives the connecting frame 6 to move to the left, the connecting frame 6 drives the slide bar 5 to move to the left, the slide bar 5 drives the blocking column 21 to move to the left side of the liquid inlet end of the L-shaped cooling channel 19, and the blocking column 21 blocks the first guide channel 22 on the left side of the liquid inlet end of the L-shaped cooling channel 19. At this time, the steering assembly is in the original position, the first solenoid valve 8 of the first liquid inlet assembly is opened, and the liquid nitrogen enters the second annular groove 18 of the guide cover 4 of the mold cooling assembly through the first liquid inlet pipe 9 of the first liquid inlet assembly, and the liquid nitrogen Then enter the U-shaped cooling channel 17 to cool the lower mold 1 first, then the liquid nitrogen machine enters the first horizontal cooling channel 16 to cool the upper mold 2, and then enters the first annular groove 15 of the outer mold 3 (as shown in Figure 6), and then enters the second guide channel 20 of the direction adjustment component, and then enters the L-shaped cooling channel 19 of the liquid spray cooling component through the second guide channel 20 of the direction adjustment component to cool the molding cavity 12 and the mold core 13, and finally sprays out from the oblique spray channel 23 to perform liquid spray cooling on the molding formation (as shown in Figure 7);

[0063] See also Figure 8-10 , the cylinder 7 of the direction adjustment component drives the connecting frame 6 to move to the right, the connecting frame 6 drives the slide bar 5 to move to the right, the slide bar 5 drives the blocking column 21 to move to the right side of the liquid inlet end of the L-shaped cooling channel 19, and the blocking column 21 blocks the second guide channel 20. At this time, the direction adjustment component is in the adjustment position, the second solenoid valve 10 of the second liquid inlet component is opened, and the liquid nitrogen enters the first annular groove 15 of the outer mold 3 of the mold body cooling component through the second liquid inlet pipe 11 and the third guide channel 24 of the second liquid inlet component (as shown in Figure 8), and the liquid nitrogen enters the first transverse cooling channel 16 to cool the upper mold 2 first, and then enters the U-shaped cooling channel 17 to cool the lower mold 1 (as shown in Figure 9), and then enters the L-shaped cooling channel 19 of the liquid spray cooling component through the first guide channel 22 of the direction adjustment component. The liquid nitrogen in the L-shaped cooling channel 19 cools the molding cavity 12 and the mold core 13, and finally sprays out from the oblique spray channel 23 to perform liquid spray cooling on the molding formation (as shown in Figure 10);

[0064] In summary, it is convenient to cool the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13, which can avoid overheating of the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13, and avoid micro-deformation due to overheating, thereby extending the use of the lower mold 1, the upper mold 2, the molding cavity 12 and the mold core 13. At the same time, the liquid spray cooling component sprays out to quickly cool the formed workpiece, thereby ensuring the molding quality; in addition, the direction adjustment component can adjust the flow direction of liquid nitrogen, and can adjust the lower mold 1 to cool the upper mold 2 first and then cool it, or the upper mold 2 to cool the lower mold 1 first and then cool it, which can avoid the lower mold 1 or the upper mold 2 being in a cooling state first, which is beneficial for the lower mold 1 and the upper mold 2 to adjust the uniform temperature state, avoid the lower mold 1 and the upper mold 2 always having a temperature difference, and is beneficial for actual use.

[0065] The invention discloses an application of a liquid nitrogen cooling die in the field of aluminum alloy extrusion.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid nitrogen cooling mold, comprising a lower mold (1), characterized in that: The lower mold (1) is provided with a molding cavity (12); The lower mold (1) is connected to the upper mold (2); A diverter bridge (14) is connected to the middle end of the upper mold (2), and a mold core (13) used in conjunction with the molding cavity (12) is fixedly connected to the end of the diverter bridge (14) close to the lower mold (1). Liquid spray cooling components for cooling the molding cavity (12) and the mold core (13) and the molded workpiece are arranged at equal intervals along the circumferential direction in the mold core (13); A second liquid inlet assembly for liquid nitrogen inlet is installed at the end of the lower mold (1) away from the upper mold (2); The lower mold (1) and the upper mold (2) are connected to a mold cooling assembly for cooling the lower mold (1) and the upper mold (2), and the second liquid inlet assembly is in communication with the mold cooling assembly; The mold cooling assembly is equipped with a first liquid inlet assembly for liquid nitrogen inlet; The lower mold (1) is connected to a direction adjustment component for adjusting the flow direction of liquid nitrogen, and the direction adjustment component is in communication with the liquid spray cooling component and the mold body cooling component. When the first liquid inlet component is feeding liquid, the flow direction of the liquid nitrogen in the mold body cooling component is the lower mold (1), the upper mold (2), the direction adjustment component, and the liquid spray cooling component; when the direction adjustment component is reversed and the first liquid inlet component is feeding liquid, the flow direction of the liquid nitrogen in the mold body cooling component is the upper mold (2), the lower mold (1), the direction adjustment component, and the liquid spray cooling component.

2. The liquid nitrogen cooling mold according to claim 1, characterized in that: The liquid spray cooling assembly comprises an L-shaped cooling channel (19) and an oblique spray channel (23); the L-shaped cooling channel (19) is arranged in an upper mold (2), a mold core (13) and a diverter bridge (14); an oblique spray channel (23) is arranged at an end of the mold core (13) away from the upper mold (2); the oblique spray channel (23) is communicated with the L-shaped cooling channel (19), and the L-shaped cooling channel (19) is communicated with the direction adjustment assembly.

3. The liquid nitrogen cooling mold according to claim 2, characterized in that: The mold body cooling assembly comprises an outer mold (3), a flow guide cover (4), a first annular groove (15), a first transverse cooling channel (16), a U-shaped cooling channel (17) and a second annular groove (18); the end of the lower mold (1) away from the upper mold (2) is fixedly connected with the flow guide cover (4); the end of the flow guide cover (4) close to the lower mold (1) is provided with a second annular groove (18); the lower mold (1) is provided with U-shaped cooling channels (17) at equal intervals along the circumferential direction; the upper mold (2) is provided with U-shaped cooling channels (17) at equal intervals along the circumferential direction; A first transverse cooling channel (16) is provided, the first transverse cooling channel (16) and the second annular groove (18) are communicated with the U-shaped cooling channel (17), the end of the upper die (2) away from the lower die (1) is fixedly connected to the outer die (3), the end of the outer die (3) close to the lower die (1) is provided with a first annular groove (15), the first annular groove (15) is communicated with the first transverse cooling channel (16), the first liquid inlet component is connected to the guide cover (4), and the second liquid inlet component is communicated with the first annular groove (15).

4. The liquid nitrogen cooling mold according to claim 3, characterized in that: The first liquid inlet assembly comprises a first solenoid valve (8) and a first liquid inlet pipe (9). The first liquid inlet pipe (9) is fixedly mounted on the outer wall of the deflector (4). The first solenoid valve (8) is mounted on the first liquid inlet pipe (9), and the first liquid inlet pipe (9) is in communication with the second annular groove (18).

5. The liquid nitrogen cooling mold according to claim 4, characterized in that: The direction adjustment component comprises a slide bar (5), a connection frame (6), a cylinder (7), a second guide channel (20), a blocking column (21) and a first guide channel (22); the end of the guide cover (4) away from the upper mold (2) is symmetrically fixedly connected to the cylinder (7); the output end of the cylinder (7) is fixedly connected to the connection frame (6); the connection frame (6) is fixedly connected to the slide bar (5); the end of the slide bar (5) away from the cylinder (7) is fixedly connected to the blocking column (21); the first guide channel (22) is opened in the lower mold (1) and the upper mold (2); the first guide channel (22) ) is slidably connected with the blocking column (21), the upper mold (2) is provided with a second guide channel (20) at the end of the first guide channel (22) away from the lower mold (1), the second guide channel (20) is communicated with the first annular groove (15), the first guide channel (22) is communicated with the second annular groove (18), the first guide channel (22) is communicated with the L-shaped cooling channel (19), and when the blocking column (21) is in contact with the end of the first guide channel (22) close to the upper mold (2), the left end of the blocking column (21) is located at the right end of the liquid inlet end of the L-shaped cooling channel (19).

6. The liquid nitrogen cooling mold according to claim 5, characterized in that: The diameter of the second flow guiding channel (20) is smaller than the diameter of the first flow guiding channel (22).

7. The liquid nitrogen cooling mold according to claim 5, characterized in that: The sliding rod (5) is slidably connected to the air guide cover (4) via a sealing ring.

8. The liquid nitrogen cooling mold according to claim 7, characterized in that: The second liquid inlet assembly comprises a second solenoid valve (10), a second liquid inlet pipe (11) and a third guide channel (24); the end of the lower mold (1) away from the upper mold (2) is fixedly connected to the second liquid inlet pipe (11); the second solenoid valve (10) is fixedly connected to the second liquid inlet pipe (11); the third guide channel (24) is provided in the lower mold (1) and the upper mold (2), and the third guide channel (24) is communicated with the second liquid inlet pipe (11).

9. The liquid nitrogen cooling mold according to claim 8, characterized in that: The third flow guiding channel (24) is communicated with the first annular groove (15).

10. Use of the liquid nitrogen cooling die as claimed in any one of claims 1 to 9 in the field of aluminum alloy extrusion.

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