A method for near semi-solid extrusion of light alloy tubes

Abstract

The application discloses a kind of light alloy pipe near semi-solid extrusion method, comprising the following steps: S1, material selection;S2, preheating;S3, centering;S4, drilling;S5, heating;S6, rolling extrusion;S7, cold rolling;S8, annealing;S9, head stretching;S10, quenching;S11, whole diameter;S12, finishing straightening;S13, quality detection;Compared with traditional preparation method, the method is prepared in the light alloy pipe blank near semi-solid state using the way of rolling extrusion, provides a kind of new light alloy pipe preparation process, reduces extrusion force, and improves the success rate of processing and the forming quality of pipe, can reduce the waste of raw materials, also can obtain high-performance light alloy pipe in lower temperature, ensure the specification precision and physical property stability of pipe, so as to improve product quality.

Description

Technical Field

[0001] This invention relates to the field of light alloy pipe manufacturing technology, specifically a near-semi-solid extrusion method for light alloy pipes. Background Technology

[0002] Light alloys are alloys made by fusing two or more metallic elements (such as aluminum, magnesium, and titanium) with a density of less than or equal to 4.5 g / cm³. Aluminum-magnesium alloys are a type of light alloy. Aluminum-magnesium alloys usually refer to aluminum alloys with magnesium as the main additive element. They have advantages such as high strength, low density, and good heat dissipation, and are widely used in electronics, automobiles, aerospace and other fields.

[0003] Currently, traditional methods for extruding light alloy pipes mainly include melting casting, extrusion casting, and powder metallurgy. Melting casting and powder metallurgy require high processing temperatures and necessitate liquefying the raw material before molding. Extrusion casting, on the other hand, requires high extrusion pressure from the extruder, necessitating the extrusion of coarse bars into fine bars, followed by subsequent operations such as drilling. This extrusion process can easily lead to cracks or even breakage in the pipe blank, resulting in material waste.

[0004] To address the aforementioned problems, this invention provides a near-semi-solid extrusion method for lightweight alloy pipes, which differs from traditional methods and can effectively solve the problems of high processing temperatures, cracks, and even breakage during the extrusion process. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the existing defects and provide a near-semi-solid extrusion method for light alloy pipes. Compared with traditional preparation methods, this method uses a rolling extrusion method to prepare pipes in a near-semi-solid state of light alloy billets, providing a brand-new light alloy pipe preparation process. This reduces extrusion pressure, improves the success rate of processing and the forming quality of the pipes, reduces raw material waste, and can obtain high-performance light alloy pipes at lower temperatures. It also ensures the accuracy of pipe specifications and the stability of physical properties, thereby improving product quality and effectively solving the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a near-semi-solid extrusion method for light alloy tubing, comprising the following steps:

[0007] S1. Material selection: Select suitable aluminum alloy blanks and perform pre-treatment such as cleaning, deburring, and dimensional adjustment;

[0008] S2. Preheating: The aluminum alloy billet is preheated in a furnace at 400-450℃ to increase its plasticity and reduce its resistance to deformation.

[0009] S3. Centering: When centering the horizontal arm drilling machine, first find the center point at one end of the aluminum alloy billet, drill a sample hole, and then fix it vertically on the drilling machine worktable for centering.

[0010] S4. Drilling: A drilling machine is used to drill holes in the aluminum alloy billet, and the head and tail of the hollow tube billet are cut off, leaving the working section of the required length, thus obtaining the hollow tube billet.

[0011] S5. Heating: Insert the mandrel into the hollow tube blank to form the part to be extruded, and put the part to be extruded into the heating furnace for heating;

[0012] S6. Rolling and extrusion: The heated workpiece is placed on the extrusion die and rolled and extruded to extrude the outer diameter of the workpiece to a certain size;

[0013] S7. Cold rolling: Cold rolling is performed on aluminum alloy tubes to refine the grain structure and improve the material density and mechanical properties.

[0014] S8. Annealing: After cold rolling, annealing is required to eliminate residual stress inside the material. The annealing temperature is generally lower than the recrystallization temperature to maintain the strength and ductility of the material.

[0015] S9. Heading and stretching: One end of the aluminum alloy tube is made into a tapered or circular shape, and then the aluminum alloy tube is stretched to further increase its length and reduce its diameter.

[0016] S10, Quenching: The stretched tube is quenched.

[0017] S11. Diameter Adjustment: The aluminum alloy tube is shaped to achieve the required diameter and shape accuracy.

[0018] S12. Finishing and straightening: After the diameter adjustment process, the pipe is finished and straightened by a straightening machine;

[0019] S13. Quality Inspection: Conduct quality inspection on the pipes, including aspects such as size, shape, and surface quality.

[0020] As a preferred embodiment of the present invention, the heating time is 60-90 minutes and the heating temperature is 450°C.

[0021] As a preferred embodiment of the present invention, in S6, the extrusion die includes an upper die that can move in the vertical direction and a lower die that can reciprocate horizontally.

[0022] As a preferred technical solution of the present invention, the rolling and extruding method of the extrusion die for the workpiece to be extruded is as follows: the workpiece to be extruded is placed in the middle of the lower die, and then the upper die is controlled to move down at a speed of 2 mm / min and the lower die is controlled to reciprocate linearly at a speed of 0.5 m / s to roll and extrude the workpiece to be extruded until the workpiece to be extruded is extruded to a certain size.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The near-semi-solid extrusion method for lightweight alloy pipes exemplified in this invention, compared with traditional preparation methods, uses a rolling extrusion method to prepare pipes in a near-semi-solid state of the lightweight alloy billet. This provides a novel lightweight alloy pipe manufacturing process, reduces extrusion pressure, and improves the success rate of processing and the forming quality of the pipes. It can reduce the waste of raw materials and obtain high-performance lightweight alloy pipes at lower temperatures, ensuring the accuracy of pipe specifications and the stability of physical properties, thereby improving product quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the extension of the extruded part to both sides when it is compressed according to the present invention;

[0026] Figure 2 This is a schematic diagram showing the movement direction of the extrusion die during operation. Detailed Implementation

[0027] 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.

[0028] Please see Figure 1-2 This invention provides a technical solution: a near-semi-solid extrusion method for lightweight alloy tubing, comprising the following steps:

[0029] S1. Material selection: Select suitable aluminum alloy blanks and perform pre-treatment such as cleaning, deburring, and dimensional adjustment;

[0030] S2. Preheating: The aluminum alloy billet is preheated in a furnace at 400-450℃ to increase its plasticity and reduce its resistance to deformation.

[0031] S3. Centering: When centering the horizontal arm drilling machine, first find the center point at one end of the aluminum alloy billet, drill a sample hole, and then fix it vertically on the drilling machine worktable for centering.

[0032] S4. Drilling: A drilling machine is used to drill holes in the aluminum alloy billet, and the head and tail of the hollow tube billet are cut off, leaving the working section of the required length, thus obtaining the hollow tube billet.

[0033] S5. Heating: Insert the mandrel into the hollow tube blank to form the part to be extruded, and put the part to be extruded into the heating furnace for heating for 60-90 minutes at a temperature of 450℃, and keep it at that temperature for 1-2 hours.

[0034] S6. Rolling and extrusion: The heated workpiece is placed on the extrusion die for rolling and extrusion, and the outer diameter of the workpiece is extruded to a certain size. Then the core rod is removed and the ends of the extruded hollow tube are cut off.

[0035] S7. Cold rolling: Cold rolling is performed on aluminum alloy tubes to refine the grain structure and improve the material density and mechanical properties.

[0036] S8. Annealing: After cold rolling, annealing is required to eliminate residual stress inside the material. The annealing temperature is generally lower than the recrystallization temperature to maintain the strength and ductility of the material.

[0037] S9. Heading and stretching: One end of the aluminum alloy tube is made into a tapered or circular shape, and then the aluminum alloy tube is stretched to further increase its length and reduce its diameter.

[0038] S10, Quenching: The stretched tube is quenched.

[0039] S11. Diameter Adjustment: The aluminum alloy tube is shaped to achieve the required diameter and shape accuracy.

[0040] S12. Finishing and straightening: After the diameter adjustment process, the pipe is finished and straightened by a straightening machine;

[0041] S13. Quality Inspection: Conduct quality inspection on the pipes, including aspects such as size, shape, and surface quality.

[0042] Furthermore, the extrusion die includes an upper die that can move vertically and a lower die that can reciprocate horizontally. The rolling extrusion method of the extrusion die is as follows: the part to be extruded is placed in the middle of the lower die, and then the upper die is controlled to move downward at a speed of 2 mm / min and the lower die is controlled to reciprocate linearly at a speed of 0.5 m / s to roll and extrude the part to be extruded until it is extruded to a certain size. Before rolling and extruding, the upper die and the lower die are preheated to a temperature of 400-430℃.

[0043] Compared with traditional preparation methods, this invention uses a rolling and extrusion method to prepare pipes in a near-semi-solid state of light alloy tube blanks. This provides a novel light alloy tube preparation process, reduces extrusion pressure, and improves the success rate of processing and the forming quality of the pipes. It can reduce the waste of raw materials and obtain high-performance light alloy tubes at lower temperatures, ensuring the accuracy of pipe specifications and the stability of physical properties, thereby improving product quality.

[0044] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A near-semi-solid extrusion method for lightweight alloy tubing, characterized in that, Includes the following steps: S1. Material selection: Select suitable aluminum alloy blanks and perform pre-treatment such as cleaning, deburring, and dimensional trimming; S2. Preheating: The aluminum alloy billet is preheated in a furnace at 400-450℃ to increase its plasticity and reduce its resistance to deformation. S3. Centering: When centering the horizontal arm drilling machine, first find the center point at one end of the aluminum alloy billet, drill a sample hole, and then fix it vertically on the drilling machine worktable for centering. S4. Drilling: A drilling machine is used to drill holes in the aluminum alloy billet, and the head and tail of the hollow tube billet are cut off, leaving the working section of the required length, thus obtaining the hollow tube billet. S5. Heating: Insert the mandrel into the hollow tube blank to form the part to be extruded, and put the part to be extruded into the heating furnace for heating; S6. Rolling and extrusion: The heated workpiece is placed on the extrusion die and rolled and extruded to extrude the outer diameter of the workpiece to a certain size; S7. Cold rolling: Cold rolling is performed on aluminum alloy tubes to refine the grain structure and improve the material density and mechanical properties. S8. Annealing: After cold rolling, annealing is required to eliminate residual stress inside the material. The annealing temperature is lower than the recrystallization temperature to maintain the strength and ductility of the material. S9. Heading and stretching: One end of the aluminum alloy tube is made into a tapered or circular shape, and then the aluminum alloy tube is stretched to further increase its length and reduce its diameter. S10, Quenching: The stretched tube is quenched. S11. Diameter Adjustment: The aluminum alloy tube is shaped to achieve the required diameter and shape accuracy. S12. Finishing and straightening: After the diameter adjustment process, the pipe is finished and straightened by a straightening machine; S13. Quality Inspection: Conduct quality inspection on the pipes, including aspects such as size, shape, and surface quality.

2. The near-semi-solid extrusion method for light alloy tubing according to claim 1, characterized in that: In S5, the heating time is 60-90 minutes and the heating temperature is 450℃.

3. The near-semi-solid extrusion method for light alloy tubing according to claim 1, characterized in that: In S6, the extrusion die includes an upper die that can move vertically and a lower die that can reciprocate horizontally.

4. The near-semi-solid extrusion method for light alloy tubing according to claim 3, characterized in that: The rolling and extrusion method of the extrusion die is as follows: Place the part to be extruded in the middle of the lower die, and then control the upper die to move down at a speed of 2 mm / min and the lower die to make a reciprocating linear motion at a speed of 0.5 m / s to roll and extrude the part to be extruded until the part to be extruded is extruded to a certain size.

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