A metro busbar production process

Abstract

The application discloses a subway busbar production process, through melting, refining, casting, homogenization, extrusion, cooling quenching, stretching straightening, pre-deformation treatment and artificial aging treatment, in the preparation process, the melting adopts multi-stage temperature heating, so that the element distribution of melting is more uniform; the cut aluminum bar is preheated to 470-485 DEG C in the extrusion process, the aluminum profile is obtained after extrusion forming, the mold preheating temperature is 440-480 DEG C, the profile mold outlet temperature is 520-540 DEG C, the aluminum bar and the mold are preheated respectively, and the profile mold outlet temperature is 520-540 DEG C; a plurality of temperatures cooperate with each other, the viscosity in the extrusion process is moderate, the yield strength and the tensile strength of the busbar are improved, the subsequent drawing and bending process by using a drawing and bending machine is avoided through pre-deformation treatment, the production cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aluminum profile production, in particular to a metro busbar production process. BACKGROUND

[0002] Aluminum alloy is a material with high strength, corrosion resistance and light weight. With the development of science and technology, various thin-walled, high-precision and complex solid and hollow aluminum profiles have emerged, and aluminum alloy has become the first choice material in many fields such as aviation, transportation, modern cars, electronic appliances, ships and weapons, and machinery manufacturing.

[0003] In the rigid catenary of metro power supply, the overhead rigid suspension mainly consists of a busbar, a contact wire, an expansion component and a center anchor, and the contact wire is arranged in the busbar. Therefore, the busbar is a key component of the rigid overhead catenary, which is a suspension support body of the contact wire and a main current-carrying conductor of the catenary.

[0004] However, the busbar in the prior art is usually made of 6101B-T6 aluminum alloy, and a draw-bending machine is usually used to solve the sag problem of the busbar during the preparation of the busbar. However, the cost of the draw-bending machine is high, and the production efficiency is low.

[0005] In summary, through the massive search of the applicant, at least there is a technical problem of high production cost and low production efficiency in using a draw-bending machine to draw-bend the busbar to meet the sag requirement. Therefore, it is necessary to develop or improve a metro busbar production process. SUMMARY

[0006] Therefore, in order to solve the problem of high production cost and low production efficiency in using a draw-bending machine to draw-bend the busbar to meet the sag requirement, the present application provides a metro busbar production process, and the specific technical scheme is as follows:

[0007] A metro busbar production process,

[0008] prepared by the following preparation process:

[0009] S1, melting and casting; the aluminum ingot is melted, the melting temperature is 690-700 DEG C, after the aluminum ingot is completely melted, other components are added according to the design composition for stirring, and the temperature is increased to 720-740 DEG C, and the stirring is uniform for heat preservation;

[0010] S2, refining and refining; Al-5Ti-1B grain refiner is added for refining, and nitrogen is introduced, and refining is carried out in the nitrogen atmosphere;

[0011] S3, casting; the material refined in S2 is cast to obtain an aluminum rod;

[0012] S4, homogenization; homogenizing the aluminum bar, and cooling the aluminum bar after the homogenization is completed;

[0013] S5, extrusion; cutting the aluminum bar, preheating the cut aluminum bar, the preheating temperature being 470-485°C, and extruding the preheated aluminum bar to obtain an aluminum profile, the mold preheating temperature being 440-480°C, and the profile mold outlet temperature being 520-540°C,

[0014] S6, cooling and quenching; water mist cooling and quenching the extruded aluminum profile, the water mist cooling temperature of the aluminum profile being below 200°C;

[0015] S7, stretching and straightening; stretching and straightening the cooled aluminum profile, the stretching deformation being 1-1.2%;

[0016] S71, pre-deformation treatment; transferring the aluminum profile of a fixed length to a rack body with a bearing seat body, and supporting and raising one side or both sides of the aluminum profile;

[0017] S8, artificial aging treatment; aging treating the aluminum profile after the pre-deformation treatment is completed;

[0018] The metro busbar is made of the following elements in percentage by weight:

[0019] Si 0.35-0.45%, Fe 0.1-0.2%, Cu≤0.02%, Mn≤0.02%, Mg 0.45-0.55%, Cr≤0.02%, Zn≤0.03%, Ti≤0.02%, and Al the balance.

[0020] Further, in the smelting of S1, the holding temperature is 720-740°C, and the holding time is 10-15 min.

[0021] Further, in the refining of S2, the refining temperature is 720-740°C, and the refining time is 25-30 min.

[0022] Further, in the homogenization of S4, the homogenization treatment temperature is 550-570°C, and the homogenization treatment time is 8-10 h.

[0023] Further, in the homogenization of S4, the cooling treatment specifically comprises water mist cooling to 180-200°C, and transferring to air cooling to room temperature.

[0024] Further, in the artificial aging treatment of S8, the aluminum profile after the artificial aging treatment is completed is cooled, the cooling method is air cooling, and the aluminum profile is cooled to room temperature.

[0025] Further, in the artificial aging treatment of S8, the aging treatment process temperature is 200±10 DEG C, and the holding time is 6h-8h.

[0026] Further, the subway busbar is made of the following elements in percentage by weight: Si 0.401%, Fe 0.142%, Cu 0.004%, Mn 0.003%, Mg 0.522%, Cr 0.002%, Zn 0.021%, Ti 0.011%, and Al the balance.

[0027] Further, the bearing seat body is arranged on one side or both sides of the frame body, wherein the bearing seat bodies arranged on one side of the frame body are arranged in pairs, and the span of the bearing seat bodies on the frame body is 0m-2m; the height of the bearing seat body is 20mm-40mm; one side or both sides of the aluminum profile is supported and raised.

[0028] Further, in the extrusion of S5, the extrusion speed is 15m / min-18m / min.

[0029] In the above scheme, through melting, refining, casting, homogenization, extrusion, cooling quenching, stretching straightening, pre-deformation treatment and artificial aging treatment, the subway busbar is made of the following elements in percentage by weight: Si 0.35%-0.45%, Fe 0.1%-0.2%, Cu≤0.02%, Mn≤0.02%, Mg 0.45%-0.55%, Cr≤0.02%, Zn≤0.03%, Ti≤0.02%, and Al the balance; in the preparation process, multi-stage temperature is adopted for heating during melting, so that the element distribution of the melting is more uniform; the aluminum bar after cutting is preheated during the extrusion process, the preheating temperature is 470 DEG C-485 DEG C, after preheating, the aluminum profile is obtained by extrusion molding, the mold preheating temperature is 440 DEG C-480 DEG C, the profile mold outlet temperature is 520 DEG C-540 DEG C, the aluminum bar and the mold are preheated respectively, and the profile mold outlet temperature is 520 DEG C-540 DEG C; the adhesion in the extrusion process is moderate through the cooperation of multiple temperatures, the yield strength and the tensile strength of the busbar are improved, the subsequent drawing and bending process using a drawing and bending machine is avoided, the production cost is reduced, and the production efficiency is improved. Meanwhile, the pre-deformation treatment is carried out before the aging treatment, the aluminum profile is raised on one side or both sides, the aluminum profile naturally droops, and the busbar is obtained through artificial aging treatment, so that the busbar reaches the drawing and bending effect in a simple and easy-to-implement manner, without large machinery, so that the cost is reduced and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a process diagram of the pre-deformation treatment of the aluminum profile of the application;

[0031] Figure 2It is a process treatment side view of the pre-deformation treatment of the aluminum profile of the present application.

[0032] Figure 3 It is a process treatment schematic diagram of one side of the pre-deformation treatment of the aluminum profile of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] A subway busbar production process in an embodiment of the present application,

[0036] Prepared by the following preparation process:

[0037] S1, melting and casting; the aluminum ingot is melted, the melting temperature is 690-700 DEG C, after the aluminum ingot is completely melted, other components are added according to the design composition for stirring, and the temperature is raised to 720-740 DEG C, and the stirring is uniform and the temperature is kept;

[0038] S2, refining and refining; Al-5Ti-1B grain refiner is added for refining, and nitrogen is introduced, and refining is carried out in the nitrogen atmosphere;

[0039] S3, casting; the material refined in S2 is cast to obtain an aluminum bar;

[0040] S4, homogenization; the aluminum bar is subjected to homogenization treatment, and the aluminum bar is cooled after the homogenization treatment;

[0041] S5, extrusion; the aluminum bar is cut, the cut aluminum bar is preheated, the preheating temperature is 470-485 DEG C, after preheating, the aluminum profile is formed by extrusion, the mold preheating temperature is 440-480 DEG C, and the profile mold outlet temperature is 520-540 DEG C,

[0042] S6, cooling and quenching; the extruded aluminum profile is subjected to water mist cooling and quenching, and the water mist cooling temperature of the aluminum profile is below 200 DEG C;

[0043] S7, stretching and straightening; the aluminum profile after cooling is stretched and straightened, and the stretching deformation is 1%-1.2%;

[0044] S71, pre-deformation treatment; the aluminum profile of a fixed length is transferred to the frame body provided with a bearing seat body, and the aluminum profile is supported and raised on one side or both sides;

[0045] S8, artificial aging treatment; the aluminum profile after pre-deformation treatment is subjected to aging treatment;

[0046] The metro busbar is made of the following elements in percentage by weight:

[0047] Si 0.35%-0.45%, Fe 0.1%-0.2%, Cu≤0.02%, Mn≤0.02%, Mg 0.45%-0.55%, Cr≤0.02%, Zn≤0.03%, Ti≤0.02%, Al balance.

[0048] In one embodiment, the holding temperature in the smelting of S1 is 720-740℃, and the holding time is 10-15min.

[0049] In one embodiment, the refining temperature in the refining of S2 is 720-740℃, and the refining time is 25-30min.

[0050] In one embodiment, the homogenization treatment temperature in the homogenization of S4 is 550-570℃, and the homogenization treatment time is 8-10h.

[0051] In one embodiment, the cooling treatment in the homogenization of S4 is water mist cooling to 180-200℃, and then air cooling to room temperature.

[0052] In one embodiment, in the artificial aging treatment of S8, the aluminum profile after artificial aging treatment is cooled by air cooling to room temperature.

[0053] In one embodiment, in the artificial aging treatment of S8, the aging treatment process temperature is 200±10℃, and the holding time is 6-8h.

[0054] In one embodiment, the metro busbar is made of the following elements in percentage by weight: Si 0.401%, Fe 0.142%, Cu 0.004%, Mn 0.003%, Mg 0.522%, Cr 0.002%, Zn 0.021%, Ti 0.011%, and Al balance.

[0055] In one of the embodiments, the bearing seat body is arranged on one side or both sides of the frame body, the bearing seat bodies arranged on one side of the frame body are arranged in pairs, and the span of the bearing seat bodies on the frame body is 0m-2m; the height of the bearing seat body is 20mm-40mm; one side or both sides of the aluminum profile is supported and raised, so that the middle part of the aluminum profile naturally deforms downward, avoiding the use of a stretch bending machine for stretch bending treatment in the prior art, reducing production cost, the process is simple and easy to implement, and production efficiency is improved. When the busbar is actually used, installation is performed in the reverse direction, that is, an arc-shaped installation structure with both ends being lower and the middle part being higher is formed.

[0056] In one of the embodiments, the length of the aluminum profile is 12m, the span of the bearing seat body on the frame body is 1m, and the height of the bearing seat body is 30mm.

[0057] In one of the embodiments, the extrusion speed in S5 is 15m / min-18m / min.

[0058] The embodiments of the application will be described in detail below with reference to specific examples.

[0059] Example 1:

[0060] A subway busbar production process is prepared by the following preparation processes:

[0061] S1, melting and casting; the aluminum ingot is melted, the melting temperature is 690℃, after the aluminum ingot is completely melted, other components are added according to the designed composition for stirring, and the temperature is increased to 720℃, the stirring is performed, the slag is removed, and the stirring is uniformly performed at the holding temperature of 720℃ for 10min;

[0062] S2, refining and refining; Al-5Ti-1B grain refiner is added for refining, and nitrogen is introduced, and refining is performed in a nitrogen atmosphere, the refining temperature is 720℃, and the refining time is 30min;

[0063] S3, casting; the material refined in S2 is cast to obtain an aluminum rod;

[0064] S4, homogenization; the aluminum rod is homogenized at 550℃ for 8h, after the homogenization is completed, the water mist is cooled to 200℃, and the air cooling is performed to room temperature;

[0065] S5, extrusion at an extrusion speed of 15m / min; the aluminum rod is cut, the cut aluminum rod is preheated, the preheating temperature is 470℃, after the preheating is completed, the extrusion is performed to obtain an aluminum profile, the mold preheating temperature is 440℃, and the profile mold outlet temperature is 520℃-530℃,

[0066] S6, cooling and quenching; the extruded aluminum profile is subjected to water mist cooling and quenching, and the water mist cooling temperature of the aluminum profile is below 220℃;

[0067] S7, stretching and straightening; the aluminum profile after cooling is subjected to stretching and straightening, and the stretching deformation is 1%-1.2%;

[0068] S71, pre-deformation treatment; the aluminum profile with a length of 12m is transferred to the frame body 1 provided with the bearing seat body 2, and the aluminum profile 3 is supported and raised on both sides; the bearing seat body 2 is arranged on both sides of the frame body 1, and the bearing seat body 2 arranged on one side of the frame body 1 is arranged in pairs, and the span A of the bearing seat body 2 on the frame body 1 is 1m; the height B of the bearing seat body 2 is 30mm; the both sides of the aluminum profile 3 are supported and raised, so that the middle part of the aluminum profile 3 naturally deforms downward, avoiding the need for a stretch-bending machine for stretch-bending treatment in the prior art, reducing production cost, and the process is simple and easy to implement, improving production efficiency.

[0069] S8, artificial aging treatment; the aluminum profile after pre-deformation treatment is subjected to aging treatment, and the aging treatment process temperature is 200±10℃, and the holding time is 6h.

[0070] The aluminum profile after artificial aging treatment is cooled, and the cooling method is air cooling, and the aluminum profile is cooled to room temperature to obtain the subway busbar;

[0071] The subway busbar is made of the following elements in percentage by weight: Si 0.401%, Fe 0.142%, Cu 0.004%, Mn 0.003%, Mg 0.522%, Cr 0.002%, Zn 0.021%, Ti 0.011%, and Al balance.

[0072] Example 2:

[0073] A subway busbar production process is prepared by the following preparation process:

[0074] S1, melting and casting; the aluminum ingot is melted at a temperature of 700℃, after the aluminum ingot is completely melted, other components are added according to the designed composition for stirring, and the temperature is increased to 730℃, the stirring is scraped, the stirring is uniform, and the temperature is kept at 730℃ for 15min;

[0075] S2, refining and refining; Al-5Ti-1B grain refiner is added for refining, and nitrogen gas is introduced, and the refining is carried out at 730℃ under nitrogen atmosphere, and the refining time is 30min;

[0076] S3, casting; the material after refining in S2 is cast to obtain an aluminum rod;

[0077] S4, homogenization; homogenizing the aluminum bar at 570℃ for 8h, after homogenization, water mist cooling to 200℃, and then air cooling to room temperature;

[0078] S5, extrusion at 18m / min; cutting the aluminum bar, preheating the cut aluminum bar to 485℃, and then extruding to obtain the aluminum profile, the mold preheating temperature is 480℃, and the profile mold outlet temperature is 520℃-530℃,

[0079] S6, cooling and quenching; water mist cooling and quenching the extruded aluminum profile, and the water mist cooling temperature of the aluminum profile is below 200℃;

[0080] S7, stretching and straightening; stretching and straightening the cooled aluminum profile, and the stretching deformation is 1%-1.2%;

[0081] S71, pre-deformation treatment; transferring the aluminum profile 3 with a length of 12m to the frame body 1 provided with the bearing seat body 2, and supporting and raising the two sides of the aluminum profile 3; the bearing seat body 2 is arranged on both sides of the frame body 1, and the bearing seat body 2 arranged on one side of the frame body 1 is arranged in pairs, and the span A of the bearing seat body 2 on the frame body 1 is 1m; the height B of the bearing seat body 2 is 30mm; supporting and raising the two sides of the aluminum profile 3 to make the middle part of the aluminum profile 3 naturally sag and deform, avoiding the use of a stretch bending machine for stretch bending treatment in the prior art, reducing production cost, and the process is simple and easy to implement, improving production efficiency.

[0082] S8, artificial aging treatment; aging the aluminum profile after pre-deformation treatment, and the aging treatment process temperature is 200±10℃, and the holding time is 8h.

[0083] Cooling the aluminum profile after artificial aging treatment by air cooling to obtain the subway busbar;

[0084] The subway busbar is made of the following elements in percentage by weight: Si 0.35%, Fe 0.1%, Cu 0.005%, Mn 0.007%, Mg 0.45%, Cr 0.004%, Zn 0.013%, Ti 0.013%, and Al balance.

[0085] Example 3:

[0086] A subway busbar production process is prepared by the following preparation process:

[0087] S1, melting; the aluminum ingot is melted, the melting temperature is 700 DEG C, after the aluminum ingot is completely melted, other components are added according to the design composition to stir, and the temperature is increased to 740 DEG C, the stirring is scraped, the stirring is uniform, and the temperature is kept at 740 DEG C for 10 min;

[0088] S2, refining, refining; Al-5Ti-1B grain refiner is added to refine, and nitrogen is introduced, and refining is carried out under the condition of nitrogen atmosphere at 740 DEG C, and the refining time is 30 min;

[0089] S3, casting; the material after refining in S2 is cast to obtain an aluminum bar;

[0090] S4, homogenization; the aluminum bar is subjected to homogenization treatment at 560 DEG C for 10 h, after homogenization treatment, water mist cooling is carried out to 180 DEG C, and air cooling is carried out to room temperature;

[0091] S5, extrusion at 16 m / min extrusion speed; the aluminum bar is cut, the cut aluminum bar is preheated, the preheating temperature is 480 DEG C, after preheating, the aluminum profile is formed by extrusion, the mold preheating temperature is 460 DEG C, and the profile mold outlet temperature is 530 DEG C-540 DEG C,

[0092] S6, cooling and quenching; the extruded aluminum profile is subjected to water mist cooling and quenching, and the water mist cooling temperature of the aluminum profile is below 220 DEG C;

[0093] S7, stretch straightening; the aluminum profile after cooling is stretched and straightened, and the stretch deformation is 1%-1.2%;

[0094] S71, predeformation treatment; the aluminum profile 3 with a length of 12 m is transferred to the frame body 1 provided with the bearing seat body 2, and the two sides of the aluminum profile 3 are supported and raised; the bearing seat body is arranged on the two sides of the frame body 1, wherein the bearing seat bodies 2 arranged on one side of the frame body are arranged in pairs, and the span A of the bearing seat body 2 on the frame body is 1 m; the height of the bearing seat body 2 is 30 mm; the two sides of the aluminum profile 3 are supported and raised, so that the middle part of the aluminum profile 3 naturally deforms downward, avoiding the need for a stretch bending machine in the prior art, reducing production cost, and the process is simple and easy to implement, improving production efficiency.

[0095] S8, artificial aging treatment; the aluminum profile after predeformation treatment is subjected to aging treatment, the aging treatment process temperature is 200 DEG C ± 10 DEG C, and the holding time is 7 h.

[0096] The aluminum profile after artificial aging treatment is cooled, the cooling method is air cooling, the aluminum profile is cooled to room temperature, and the metro busbar is obtained;

[0097] The metro busbar is made of the following elements in percentage by weight: Si 0.45%, Fe 0.2%, Cu 0.02%, Mn 0.02%, Mg 0.55%, Cr 0.02%, Zn 0.02%, Ti 0.02%, Al balance.

[0098] Example 4

[0099] The raw material composition is changed, and the metro busbar is made of the following elements in percentage by weight: Si 0.405%, Fe 0.151%, Cu 0.006%, Mn 0.005%, Mg 0.5%, Cr 0.01%, Zn 0.01%, Ti 0.01%, Al balance.

[0100] Comparative Example 1

[0101] Comparative Example 1 is not subjected to the S71 step in Example 1, and the other preparation processes are the same as those in Example 1.

[0102] Comparative Example 2

[0103] The raw material composition is changed, and the metro busbar is made of the following elements in percentage by weight: Si 0.23%, Fe 0.08%, Cu 0.02%, Mn 0.02%, Mg 0.5%, Cr 0.02%, Zn 0.02%, Ti 0.02%, Al balance.

[0104] Comparative Example 3

[0105] The raw material composition is changed, and the metro busbar is made of the following elements in percentage by weight: Si 0.35%, Fe 0.3%, Cu 0.02%, Mn 0.02%, Mg 0.5%, Cr 0.02%, Zn 0.02%, Ti 0.02%, Al balance.

[0106] The metro busbars prepared in Examples 1-4 and Comparative Examples 1-3 are subjected to relevant performance detection, and the results are shown in Table 1. The relevant performance tests are carried out according to the electrified railway contact network busbar test standard TB / T3252-2010.

[0107] Table 1

[0108] Item Yield strength Tensile strength Sag Example 1 250 MPa 220 MPa 50 mm Example 2 240 MPa 210 MPa 55 mm Example 3 248 MPa 213 MPa 51 mm Example 4 255 MPa 227 MPa 52 mm Comparative Example 1 248 MPa 218 MPa 66 mm Comparative Example 2 224 MPa 187 MPa 59 mm Comparative Example 3 220 Mpa 180 Mpa 60 mm

[0109] From the data analysis of Table 1, in Examples 1-4, the subway busbars produced by the application have good yield strength and tensile strength, and at the same time meet the requirements of the industry busbar sag. The use of the raised way to pre-treat the subway busbar makes it suspended, and after completing the aging treatment, it achieves permanent deformation, forms a busbar with a certain arc, avoids using a stretch-bending machine for stretch-bending, reduces production cost, and improves production efficiency. Specifically, the difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not undergo the S71 step treatment; it is illustrated that the pre-deformation treatment of the aluminum profile in Examples 1-4 of the application has a positive effect on reducing the sag value of the prepared subway busbar; and at the same time meets the industry requirements for the sag of the subway busbar.

[0110] The difference between Comparative Example 2 and Example 1 is that the types of raw materials added are different, specifically, the amount of Si added is less. From the data in Table 1, it can be seen that under the condition of less Si content, the yield strength and tensile strength of the prepared subway busbar, sag are all decreased compared with Example 1, which illustrates that the Si content in Example 1 of the application has a positive effect on the performance effect of the yield strength, tensile strength, sag of the produced subway busbar; and can meet the industry requirements for the sag of the subway busbar.

[0111] The difference between Comparative Example 3 and Example 1 is that the raw materials added in Comparative Example 3 are different, specifically, the Fe content in Comparative Example 3 is higher. From the data in Table 1, it can be seen that under the condition of higher Fe content, the yield strength and tensile strength of the prepared subway busbar, sag are all decreased compared with Example 1, which illustrates that the Fe content in the application keeps in a lower range, which has a positive effect on the performance effect of the yield strength, tensile strength, sag of the produced subway busbar; and can meet the industry requirements for the sag of the subway busbar.

[0112] In the above scheme, through melting, refining, casting, homogenization, extrusion, cooling quenching, stretching straightening, pre-deformation treatment, artificial aging treatment, wherein the metro busbar is made of the following elements in percentage by weight: Si 0.35%-0.45%, Fe 0.1%-0.2%, Cu≤0.02%, Mn≤0.02%, Mg 0.45%-0.55%, Cr≤0.02%, Zn≤0.03%, Ti≤0.02%, Al balance; in the preparation process, multi-stage temperature is used for heating in the melting, so that the element distribution of the melting is more uniform; the aluminum bar after cutting is preheated in the extrusion process, the preheating temperature is 470-485 DEG C, after preheating, the aluminum profile is obtained by extrusion molding, the mold preheating temperature is 440-480 DEG C, the profile mold outlet temperature is 520-540 DEG C, the aluminum bar and the mold are preheated respectively, and the profile mold outlet temperature is 520-540 DEG C; the multiple temperatures cooperate with each other, so that the viscosity in the extrusion process is moderate, the yield strength and the tensile strength of the busbar are improved, through pre-deformation treatment, the subsequent draw bending process using a draw bending machine is avoided, the production cost is reduced, and the production efficiency is improved. At the same time, pre-deformation treatment is carried out before aging treatment, the aluminum profile is raised on one side or both sides, the aluminum profile naturally droops, and the busbar is obtained through artificial aging treatment, the way of achieving the draw bending effect of the busbar is simple, easy to realize, and does not need large machinery, so that the cost is reduced and the production efficiency is improved.

[0113] The technical features of the above-described embodiments can be combined in any manner, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0114] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A subway busbar manufacturing process, characterized in that, It is prepared by the following process: S1, Melting and casting; Melting aluminum ingots at a temperature of 690℃-700℃. After the aluminum ingots are completely melted, other components are added according to the design composition and stirred. The temperature is then raised to 720℃-740℃, stirred evenly, and kept at that temperature. S2, Refining and Refining: Al-5Ti-1B grain refiner is added for refining, and nitrogen gas is introduced for refining in a nitrogen atmosphere; S3, casting; casting the refined material from S2 to obtain aluminum rods; S4, homogenization; homogenize the aluminum rod, and then cool the aluminum rod after homogenization. S5, extrusion; Cut aluminum rods and preheat them to 470℃-485℃. After preheating, extrude them to obtain aluminum profiles. The mold preheating temperature is 440℃-480℃ and the profile mold exit temperature is 520℃-540℃. S6, Cooling and quenching; The extruded aluminum profile is subjected to water mist cooling and quenching until the temperature of the aluminum profile is below 200℃. S7, Stretch straightening; Stretch straightening is performed on the cooled aluminum profiles, with a stretch deformation of 1%-1.2%; S71, Pre-deformation treatment; Transfer the fixed-length aluminum profile to the frame with the support base, and support and elevate the aluminum profile on one or both sides; The support base is set on one or both sides of the frame, wherein the support base set on one side of the frame is set in pairs, and the span of the support base on the frame is 0m-2m; The height of the support base is 20mm-40mm; Support and elevate the aluminum profile on one or both sides; S8, manual aging treatment; Aging treatment is performed on the pre-deformed aluminum profiles; The subway busbar is made up of the following elements by weight percentage: Si 0.35%-0.45%, Fe 0.1%-0.2%, Cu≤0.02%, Mn≤0.02%, Mg 0.45%-0.55%, Cr≤0.02%, Zn≤0.03%, Ti≤0.02%, Al balance.

2. The subway busbar manufacturing process according to claim 1, characterized in that, In the S1 casting process, the holding temperature is 720℃-740℃, and the holding time is 10min-15min.

3. The subway busbar manufacturing process according to claim 1, characterized in that, In the refining of S2, the refining temperature is 720℃-740℃ and the refining time is 25 min-30 min.

4. The subway busbar manufacturing process according to claim 1, characterized in that, In the homogenization of S4, the homogenization temperature is 550℃-570℃ and the homogenization time is 8 h-10 h.

5. The subway busbar manufacturing process according to claim 1, characterized in that, In the homogenization of S4, the cooling process specifically involves water mist cooling to 180℃-200℃, followed by air cooling to room temperature.

6. The subway busbar manufacturing process according to claim 1, characterized in that, In the artificial aging process of S8, the aluminum profiles that have completed the artificial aging process are cooled by air cooling to room temperature.

7. The subway busbar manufacturing process according to claim 1, characterized in that, In the artificial aging treatment of S8, the aging process temperature is 200±10℃, and the holding time is 6h-8h.

8. The subway busbar manufacturing process according to claim 1, characterized in that, The subway busbar is made of the following elements by weight percentage: Si 0.401%, Fe 0.142%, Cu 0.004%, Mn 0.003%, Mg 0.522%, Cr 0.002%, Zn 0.021%, Ti 0.011%, and Al balance.

9. The subway busbar manufacturing process according to claim 1, characterized in that, In the extrusion of S5, the extrusion speed is 15m / min-18m / min.

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