CN116160245A

CN116160245A - Preparation method of high-strength spoke type motorcycle wheel

Info

Publication number: CN116160245A
Application number: CN202310224263.XA
Authority: CN
Inventors: 刘佛安; 郭世杰; 涂季冰
Original assignee: Giant Light Alloy Technology Haian Co ltd; Dingmg New Material Technology Co ltd
Current assignee: Giant Light Alloy Technology Haian Co ltd; Dingmg New Material Technology Co ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-05-26

Abstract

The invention provides a preparation method of a high-strength spoke type motorcycle wheel, which comprises the steps of adding low-carbon processing aluminum scraps or recycling aluminum scraps, and preparing aluminum alloy melt by pure aluminum ingots and alloy ingots; the melt is subjected to degassing and filtering treatment to prepare a solid cast rod or a hollow ingot blank; cutting into slices with a certain thickness along the transverse direction, wherein the center of the solid cast rod slice is punched, and the inner surface and the outer surface of the hollow cast rod slice are milled and then are rolled to form rings; the wheel is shaped into spoke type wheel after rolling ring and is made into spoke type motorcycle wheel after heat treatment and surface treatment. When the process method is adopted, when the alloy is configured into 6× alloy, the tensile strength value reaches 330MPa and the elongation reaches 12%; when the alloy is prepared as a 7× alloy, the tensile strength is greater than 550MPa and the elongation is greater than 13%. The wheel has excellent performance, high light weight degree, beautiful and bright surface after the anodic treatment, and completely accords with the characteristics of light weight, beautiful and cool and dazzling spoke wheels.

Description

Preparation method of high-strength spoke type motorcycle wheel

Technical Field

The invention relates to a method for preparing a high-strength spoke type motorcycle wheel, belonging to the field of aluminum alloy wheel preparation.

Background

The first time a motorcycle was invented by de national goldberg-dymler in 1885, which has been 100 years old from now. The frame of the original motorcycle is wooden, the wheels are also wooden, and the outer layer of the wheels is covered with a layer of iron sheet. After the 30 s of the 20 th century, the design and development of motorcycles are gradually mature, and the motorcycle is widely applied to traffic, competition and military aspects. In recent decades, in order to adapt to various appearance designs, light aluminum alloy wheels gradually replace steel wheels and are increasingly favored by young people. At present, the light aluminum alloy wheels for motorcycles are divided into an integral type and a spoke type from the assembly form. Spokes are a classical motorcycle wheel assembly form, when the hub encounters a strong impact, the impact force is dispersed to a plurality of spokes, and as the gaps between the spokes dissipate, the spoke wheel or hub is more suitable for off-road motorcycles or ADV types. The cross-country motorcycle is mainly applied to non-auxiliary pavement such as mountain land, jungle, marsh, desert, gobi and the like, and because of the special use environment, the spoke type wheel has very high requirements on the strength, tensile strength, light weight and appearance of the hub structure, and the requirements on the material and the forming process of the spoke type motorcycle wheel are also higher. Meanwhile, with the improvement of environmental protection requirements and the establishment of a low-carbon ecological city index system, the low-carbon preparation concept and realization of the whole process of urban vehicle preparation are also attracting more and more attention. The spoke type motorcycle hub material mainly comprises 6 xXsystem Al-Mg-Si series and 7 xXsystem Al-Zn-Mg-Cu series aluminum alloys which are processed in a deformable manner and reinforced by heat treatment, and can realize color anode surface treatment on the premise of ensuring the weight reduction of the wheel, thereby meeting the characteristics of portability, strong operability and beautiful appearance of the motorcycle.

In order to take the prior spoke type wheel material and forming mode, patent CN1053620C discloses a spoke type light alloy motorcycle wheel, wherein the selected material is primary aluminum alloy containing copper, magnesium, manganese, chromium and silicon elements, and the adopted forming process scheme is extrusion aluminum alloy strips, and the spoke type light alloy motorcycle wheel is formed by the processes of rounding, welding into a circle, heat treatment, punching, coloring and the like. Patent CN101298121a discloses a primary aluminum alloy containing silicon, iron and magnesium, which adopts gravity casting and is integrally formed, but the tensile strength of the wheel of the material and the process is only about 214MPa, and the requirements of an ultrathin structure of a spoke type wheel and resistance to spoke pull-out force are not met. Patent CN106222498A discloses an aluminum alloy plate for a motorcycle hub and a preparation method thereof, wherein pure aluminum containing Si, fe, cu, mn, mg, cr, zn, ti elements and having a purity of more than 99.7% is adopted to prepare an aluminum alloy thick plate material, and the aluminum alloy thick plate material is rolled and thinned and then circularly welded to form the motorcycle hub. The adopted aluminum alloy material is a primary aluminum alloy plate. The existing spoke type motorcycle hubs are all made of primary aluminum alloy materials, and the preparation process is complex and long in flow. Whether the extruded material is round or the plate is round, the extruded material is finally required to be welded and formed, and higher requirements are also put on the weldability of the material and the strength of the welding seam, and the applicability and the universality of the material and the process are limited.

Disclosure of Invention

The invention aims to provide a method for preparing a spoke type motorcycle wheel with high strength, which mainly comprises the steps of raw material selection and hub preparation, wherein the raw material selection is added with 40% -100% of renewable waste aluminum materials, the balance is pure aluminum ingots and intermediate alloy ingots, a semi-continuous casting mode is adopted to prepare a casting rod after smelting and purifying treatment, annular rolling deformation is immediately carried out after homogenization, then a tire lip and tread structure are prepared through hot spinning, and finally the whole wheel is prepared into a spoke type wheel finished product after heat treatment strengthening and surface coloring treatment for subsequent punching and assembly.

In order to achieve the above purpose, the production process of the invention is realized by the following technical scheme and steps:

(1) Raw material selection: selecting processing aluminum scraps or recycling aluminum scraps with the addition proportion of 40-100 percent, and the balance of pure aluminum ingots and intermediate alloy ingots, a 6× series or 7× series aluminum alloy melt material was placed in a melting furnace. When the alloy material is a 6×× aluminum alloy, the following element ratios are satisfied: 0.7-1.3%; mg:0.6-1.2%; mn:0.4-1.0%; fe:0.12-0.31%; cr:0.1-0.3%; cu:0.05-0.10%; zn:0.05-0.2%; the balance being Al, the rest elements being regarded as impurities and the content being less than 0.1%. When the alloy material is a 7×× aluminum alloy, the following element ratios are satisfied: 5.7-6.7%; cu:2.0-2.6%, mg:1.9-2.6%; fe:0.10-0.20%; si:0.04-0.12%; mn:0.03-0.10%; zr:0.07-0.20%; the balance being Al, the rest elements being regarded as impurities and the content being less than 0.05%.

(2) The preparation method comprises the following steps: the preparation method of the invention is mainlyThe method comprises the following steps: and (3) melting and melt processing, casting rod preparation and homogenization, ring rolling and hot spinning deformation, heat treatment, surface treatment and other main processes. Unlike the conventional casting or forging deformation forming mode for wheel preparation, the invention has the following control elements and innovation points: A. melting the melt: the raw materials are melted in a melting furnace with electromagnetic stirring function, and the melt in the furnace is driven by an electromagnetic stirrer to rotate clockwise or anticlockwise in the furnace during the melting process, the temperature of the melt in the furnace is uniform by virtue of the rotating function and is not higher than 730-750 ℃ at any position in the furnace during the melting stage, so that high temperature in a certain area during the melting process caused by adding 40% -100% of processed aluminum waste or recycling aluminum waste is prevented, and a large amount of Al is generated by the reaction of oxygen in the air and aluminum ₂ O ₃ The particles, in turn, affect the mechanics and elongation of the wheel, as well as the quality of the anodized bright color. B. Degassing and filtering: compared with the prior aluminum ingot used as the raw material, the invention selects a certain proportion of processed aluminum scraps and recovered aluminum scraps, and the specific surface of the processed aluminum scraps and recovered aluminum scraps is larger than that of the prior aluminum ingot, and oil stains, oxides, salt particles and other substances are often adhered to the surface of the processed aluminum scraps, so that a large amount of hydrogen and oxide inclusions released by the decomposition of water vapor and the oil stains can be mixed into the aluminum alloy melt after the aluminum alloy melt is melted, and the hydrogen content and inclusion content values in the melt are higher. In order to prevent the corresponding increase of the hydrogen content of the melt caused by the excessively high proportion of the added aluminum waste material from affecting the mechanical properties and fatigue impact resistance of the wheels, the method adopts a composite serial degassing mode to remove hydrogen from the molten metal aluminum alloy melt, namely adopts a launder type degassing serial box type double-rotor degassing or two box type double-rotor degassing machines to be connected in series, or adopts a box type degassing machine to be connected in series with a vacuum degassing machine to carry out combined dehydrogenation treatment on the melt, and adopts a two-stage plate type filtering or plate type pipe type combined filtering device mode to carry out filtering treatment on the melt, and then carries out a semi-continuous casting procedure. The content of hydrogen in the melt after the treatment is required to be less than or equal to 0.13ml/100gAl, and the total content of inclusions is controlled within the range of 0.008-0.029 mm ² Between/kg; C. semi-continuous casting and homogenization: the semi-continuous casting process is adopted to prepare the aluminum alloy blank of the wheel to be processed, and the casting rod is a solid casting rod with the diameter larger than phi 200mm or a solid casting rod with the large inner diameterAfter casting is completed on hollow cast rod with phi of 100mm, several round cake blanks with thickness of 50-350mm are sawed along the vertical axis direction, and then homogenized and rolled. If the blank is a solid cast rod, sawing the blank into a round blank to be deformed, punching the center with the diameter larger than phi 100mm, and homogenizing. According to the alloy material types and process requirements, slicing blanks are placed at intervals, and the blanks are subjected to continuous homogenization heat treatment by adopting a chain type homogenizing furnace, wherein the homogenizing furnace is divided into two areas for two-stage homogenization regulation and control, and when 6×× alloy is selected, the temperature range of one area is 550-560 ℃ and the residence time is: 5-15h, wherein the second zone is 570-590 ℃, and the residence time is as follows: 1-3h; when selecting a 7× series alloy, the one zone temperature range is 440 ℃ to 460 ℃ and the residence time is: 6-20h, the temperature of the second zone is 470-500 ℃, and the residence time is as follows: and 1-5h. In the homogenization treatment process, blanks are placed at intervals, so that the homogenization efficiency of the blanks can be improved, the time is shortened, overburning is prevented, and the chain type homogenizing furnace can sequentially pass through two temperature control sections in the furnace by utilizing chain transmission, so that the continuous two-stage homogenization process is completed. Compared with the traditional method of homogenizing the cast rod and then sawing, the method has the advantages that the homogenizing efficiency of the annular blank is higher, the required time is shorter, the step-by-step continuous two-stage homogenizing process of the blank can be realized, and the homogenizing effect of materials used for the wheel is ensured. D. And (5) rolling ring deformation and hot spinning forming: and rapidly cooling the ring-shaped blank after the homogenization treatment to the temperature ranging from 200 ℃ to 400 ℃ at the cooling rate of 80 ℃/h to 200 ℃/h, and directly carrying out ring rolling forming. When the ring is rolled, the blank rotates along the circumferential direction under the friction force of the forming roller of the ring rolling machine, the diameter of the annular blank is gradually increased along with the rolling, the thickness of the annular blank is gradually reduced, and the radial processing deformation rate is ensured to be more than 60 percent so as to enable the cast structure to be fully processed and deformed. When the outer diameter and the thickness of the workpiece reach the required size requirement of the wheel, the ring rolling forming is finished. The high-strength 6 XX or 7 XX aluminum alloy member obtained by rolling the ring is heated to 50-350 ℃ for hot spinning deformation, and the 6 XX or 7 XX aluminum alloy member has high plasticity under the temperature condition and can be spun into the section shape required by the tire bead and the tread without cracking. Compared with the traditional spoke type wheel aluminum alloy material, the aluminum alloy material is extruded or subjected to extrusionThe wheel manufactured by adopting the rolling ring forming process can ensure that the wheel structure is compressed along the radial direction and simultaneously bears the tensile acting force along the circumferential direction, the deformation direction of the aluminum alloy microscopic grains is continuous and consistent along the circumferential direction of the wheel and the whole wheel, the wheel has no metallurgical welding line or the structural defect that the grain streamline is inconsistent with the circumferential direction, and the microscopic grain structure meets the severe requirements of the spoke type motorcycle wheel pair on the light structure and the high bearing capacity. Meanwhile, in the recycled aluminum raw material adopted in the invention, coarse impurity phase particles containing Fe, mn, si and the like are inevitably contained, and the particle phase structure is easier to break under the condition of strong deformation of ring rolling and spinning, so that the forming mode can allow the material to contain relatively more impurity elements without reducing the product performance, and the adaptability and selectable space of the raw material are larger. E. Heat treatment and surface treatment: after spinning is finished, the wheels are respectively strengthened through solid solution and aging heat treatment according to the technological system requirements of selecting aluminum alloy materials so as to improve the strength value and the extensibility of the wheels, ensure the light requirements and the impact resistance and fatigue resistance, and the surface is subjected to anodic oxidation coloring treatment so as to meet the beautiful and cool and attractive requirements of customers on spoke-type motorcycle wheels.

The spoke type motorcycle wheel prepared by adopting the materials and the working procedures has the advantages that the surface is colorful and bright, when the raw materials are 6 x alloy, the circumferential tensile strength is 335MPa-400MPa, and the elongation is 11% -15%; when the raw material is selected to be a 7 x alloy, the circumferential tensile strength thereof is in the range of 550M-580MPa, and the elongation thereof is in the range of 10-15%.

Compared with the prior art, the invention has the following positive and beneficial effects:

(1) The aluminum alloy material used in the invention adopts the processing aluminum scraps or the recycling aluminum scraps with the addition proportion of 40% -100% to replace the aluminum processing scraps with the traditional process, wherein the matching proportion of the metal pure aluminum ingot is not more than 20%, the selectable range of raw materials is wider, according to the calculation of aluminum processing carbon footprint, the invention can realize the mode that the low-carbon-value aluminum processing scraps or the recycling scraps replace the mode that the spoke type wheel products are prepared by relying on the high-carbon-value original aluminum ingot, and the spoke type aluminum wheels of the motorcycle can realize the green manufacturing with the low carbon value under the industrial background of carbon reaching peaks and carbon neutralization in China.

(2) Compared with the traditional spoke type wheel adopting the processing mode of welding or forging deformation of an extruded material, the invention adopts the casting rod to be prepared by punching, ring rolling and spinning forming, the wheel structure has the microstructure characteristics of uniform stress deformation along the annular bearing direction, full grain crushing and uniform change along the circumferential direction, the characteristics of high strength and strong radial impact resistance can be realized, the product strength and plastic loss caused by adopting the regenerated aluminum material are compensated through uniform and strong plastic deformation along the circumferential direction, and the requirements of high strength and high toughness of the spoke type wheel are realized through the circumferential integral deformation process while the green low-carbon characteristic is realized.

(3) The melt treatment process adopts a high-efficiency composite degassing and combined filtering deslagging method, effectively solves the problem that the content of hydrogen and oxide inclusion in the melt is too high due to the addition of 40-100% of processed aluminum scraps or recovered aluminum scraps in the casting process, has compact cast rod structure and no defects of air holes and micro-porosity, provides a high-quality blank without macroscopic defects for the processed vehicle type of a subsequent vehicle wheel, and can remarkably improve the fatigue life of the vehicle wheel product.

(4) Compared with the whole homogenization of the cast rod and sawing molding of the cast rod by the traditional process, the two-stage homogenization heat treatment mode of the cast rod slice by the chained step homogenization treatment furnace has the advantages that the required homogenization time of the process mode is short, the homogenization effect is sufficient, the waste heat is utilized for direct heat processing deformation after homogenization, the continuity and integration of homogenization and ring rolling deformation processes are realized, the production beat is more compact, and the energy utilization rate is higher.

(5) When the spoke type motorcycle wheel product prepared by the invention selects 6×× alloy, the circumferential tensile strength value of the product is more than 335MPa and the elongation is more than 11% on the premise that the content of Fe element in impurities is as high as 0.12-0.31%; when a 7× alloy is selected, the product has a tensile strength value in the circumferential direction of more than 550MPa and an elongation of more than 10% on the premise that the content of the impurity Fe element is as high as 0.12 to 0.31%. The wheel has excellent overall performance, high light weight degree, attractive and bright surface after anodic treatment, and the performance and the appearance accord with the characteristics of light weight, beautiful appearance and cool dazzling of the spoke type wheel of the motorcycle.

Drawings

Fig. 1 is a photograph of a wheel prepared.

Detailed Description

The invention is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.

Example 1

Selecting 75% of aluminum processing waste and 23% of pure aluminum ingot as raw materials, adding aluminum-silicon intermediate alloy, aluminum-manganese intermediate alloy, aluminum-chromium intermediate alloy and metal magnesium ingot with the addition ratio of less than 1%, and putting the materials into a smelting furnace for smelting to prepare the alloy with Si content of 0.85%; mg content 0.76%; mn content 0.41%; fe content 0.18%; cr content 0.12%; the alloy melt of 6 x system with the balance of Al is melted in a melting furnace with an electromagnetic stirring function at the bottom, the melting temperature is kept at 740 ℃, the aluminum liquid temperature is ensured to be uniform, the phenomenon of local high temperature is avoided, and the phenomenon that a large amount of oxides are involved in the melt occurs.

In order to prevent the increase of the hydrogen content and oxide inclusion content of the melt caused by the excessively high proportion of the processed aluminum scraps with the proportion of 75 percent from influencing the quality of wheel products, after the configured 6X alloy melt is melted, stirred and refined, the melt is subjected to dehydrogenation treatment in a composite degassing treatment mode of a launder type degasser connected in series with a double-rotor box type degasser, the melt is subjected to inclusion removal by adopting a 40-mesh/60-mesh double-stage plate type filtration to purify the melt, the hydrogen content of the melt after the treatment is 0.125ml/100gAl, and the total content of the inclusions in the melt after the offline detection of a filter box is 0.023mm ² /kg。

The treated melt adopts a double-drainage and strong-cooling oil-gas lubrication casting disc to prepare a casting rod with the diameter phi of 250mm, and the microscopic grain size inside the casting rod is 1 grade without microscopic loosening and air hole defects. Sawing a plurality of round cake slices with the thickness of 150mm along the direction perpendicular to the length direction of the casting rod, and turning the center of each round cake slice into a through hole, wherein the central aperture is phi 120mm after completion. According to the requirement of the prepared 6X alloy products, placing the sliced blanks into a chain type step homogenizing furnace in a manner of being spaced from each other for homogenizing treatment, carrying out double-zone double-stage homogenizing treatment through zonal temperature regulation, respectively carrying out a first-zone heating and heat preservation process and a second-zone heating and heat preservation process on the blanks with internal through holes along with chain transmission in the homogenizing furnace, wherein the homogenizing treatment temperature is 550 ℃, the residence time is 6h, the residence time is 575 ℃, the residence time is 2h, moving the blanks out of the homogenizing furnace after the required homogenizing time is finished, and then rapidly cooling the blanks to 300 ℃ at the cooling rate of 200 ℃/h, and directly carrying out ring grinding processing deformation.

In the ring rolling forming process, the blank rotates at a high speed under the action of friction force of a forming roller of the ring rolling machine, the diameter of the annular blank is gradually increased along with the rolling, the thickness of the annular blank is gradually thinned, after the ring rolling deformation is finished, the radial processing deformation rate of the blank reaches 75%, and the outer diameter size is phi 541mm. The annular blank after the ring rolling forming is placed on a spinning machine, and the annular blank is spun into the shape of the section of the wheel required by the tire bead and the tread at the temperature of 35 ℃. In the spinning deformation process, the width of the spinning blank is continuously increased, and the thickness is further thinned. After spinning, the wheels are subjected to solution treatment at 550 ℃/1h and aging heat treatment at 165 ℃/10h respectively, the mechanical properties of the wheel products are tested, the tensile strength is 335MPa, the elongation is 12%, the wheel photo prepared according to the embodiment 1 is shown in figure 1, and the wheel properties meet the requirements of customers on the mechanical and strength properties of spoke type motorcycle wheel sets. After the wheels are anodized, the surfaces are in sub-black, and are additionally provided with metallic luster, so that the requirements of customers on the appearance of products are met, and no chromatic aberration or punctiform surface defects are caused.

Example 2

Selecting 50% of 7×× aluminum alloy processing scraps and 40% of pure aluminum ingots as raw materials, adding less than 10% of pure zinc ingots, pure magnesium ingots, pure copper plates, aluminum zirconium intermediate alloys and the like, putting the raw materials into a smelting furnace for smelting, wherein the alloy composition range of the materials is Zn:6.3%; cu:2.0%, mg:2.1%; fe:0.12%; si:0.06%; mn:0.03%; zr:0.15%; the content of the rest elements is less than 0.05 percent. In the smelting process, an electromagnetic stirrer at the bottom of the furnace is started, so that continuous stirring of the aluminum melt in the smelting process is realized, the temperature of the melt in the furnace is relatively uniform, the smelting temperature range is 730 ℃, the flame intensity of the smelting furnace is automatically regulated and controlled, and the local temperature of the aluminum melt is prevented from not exceeding 760 ℃. In the process of finishing twice refining in the smelting furnace, the melt is poured into a standing furnace to carry out internal rotation degassing and standing treatment.

After smelting, pouring the melt into a static furnace for standing treatment for 40min, taking out surface scum and oxide, and then carrying out dehydrogenation treatment on the melt through serial degassing treatment of a launder type degassing machine and a double-rotor box type degassing machine combination so as to reduce the hydrogen content in the melt, and meanwhile, the serial combination degassing mode can also lead the fine oxide in the melt to be brought into the surface of the melt along with the degassing process to a certain extent, thereby achieving the purpose of purifying the melt to a certain extent. After degassing treatment, detecting that the control value of the hydrogen content at the outlet position of a degassing tank is 0.135ml/100gAl, filtering the melt by adopting a 40-mesh and 60-mesh double-stage plate type filtering mode, wherein the total content of impurities in the filtered melt is 0.021mm ² /kg。

And after degassing and filtering are finished, adopting an oil-gas lubrication crystallizer to prepare a casting rod with the diameter of 250mm, wherein the casting speed is 70mm/min, the cooling water flow is 32T/h, no microscopic porosity and inclusion defects exist in the casting rod after the preparation is finished, and the microscopic grain size is 120 mu m. And sawing a plurality of round cake slices with the thickness of 180mm along the direction perpendicular to the length direction of the casting rod after casting, and turning the center of each round cake slice into a through hole, wherein the central aperture is phi 130mm after completion. And after the completion of the homogenization treatment process, carrying out double-zone double-stage homogenization heat treatment by adopting a chain transmission stepping homogenizing furnace according to the homogenization treatment process requirements of the 7×× annular blank, wherein the treatment temperature is 450 ℃ for a first zone ingot temperature and 470 ℃ for a second zone ingot temperature, and the inner through hole blank is subjected to double-stage homogenization heat treatment by respectively carrying out a first zone heating and a second zone heating and heat preservation process along with chain transmission in the homogenization treatment time period, and the blank is moved out of the homogenizing furnace in a thermal state after the treatment is completed, and is rapidly cooled to 350 ℃ at a cooling rate of 200 ℃/h so as to directly carry out ring grinding processing deformation.

In the ring rolling forming process, the central through hole 7××blank rotates at high speed under the action of friction force of the ring rolling machine forming roller in a hot state, the blank is continuously rolled and deformed, the central aperture is continuously enlarged, the blank is continuously deformed along the radial direction, and the outer diameter size is gradually increased along with the rolling and deformation. Along with the rolling, the diameter of the annular blank is gradually increased, the thickness of the annular blank is gradually reduced, and meanwhile, along with the continuous heat release of the processing deformation, the surface temperature of the blank is also increased to 380 ℃. After the rolling ring deformation is finished, the radial processing deformation rate of the blank reaches 78%, and the outer diameter size is increased to phi 550mm.

And (3) placing the annular blank after the ring rolling is finished on a spinning machine, continuously increasing the width of the 7× wheel blank under the combined action of a spinning roller and a spinning die, further thinning the thickness, spinning the blank section into an arc-shaped groove section required by a tire bead and a tire tread by a regular rectangle, carrying out solution treatment on the wheel after spinning, and carrying out two-stage aging heat treatment of 120 ℃/12h+170 ℃/3h to finish the hardness and performance regulation of the 7×× wheel product. After the wheel is subjected to heat treatment, the tensile strength is 570MPa, the elongation is 12%, the surface of the wheel is bright golden after the wheel is subjected to anode treatment, the wheel presents beautiful metallic luster, no surface defect exists, various performance requirements of a customer on a spoke type high-strength light motorcycle wheel set are met, and the preparation of a low carbon value product of a sport series wheel is realized.

Claims

1. A preparation method of a high-strength spoke type motorcycle wheel is characterized by comprising the following steps:

(1) Raw material selection: selecting 40% -100% of processed aluminum scraps or recycled aluminum scraps, adding pure aluminum ingots and alloy ingots with the balance not higher than 60%, putting the pure aluminum ingots and the alloy ingots into a smelting furnace for smelting, and preparing the alloy into a 6×× alloy, wherein Si:0.7-1.3%; mg:0.6-1.2%; mn:0.4-1.0%; fe:0.12-0.31%; cr:0.1-0.3%; cu:0.05-0.10%; zn:0.05-0.2%; the balance being Al, the rest elements being regarded as impurities and the content being less than 0.1%; or configured as a 7× series alloy, wherein Zn:5.7-6.7%; cu:2.0-2.6%, mg:1.9-2.6%; fe:0.10-0.20%; si:0.04-0.12%; mn:0.03-0.10%; zr:0.07-0.20%; the balance being Al, the rest elements being regarded as impurities and the content being less than 0.05%;

(2) The preparation method comprises the following steps: the method mainly comprises the main working procedures of material melting and melt processing, cast rod preparation and homogenization, ring rolling and hot spinning deformation, heat treatment, surface treatment and the like; in the process of melting materials and processing the melt, the melted aluminum alloy melt is subjected to hydrogen removal treatment by adopting a composite serial degassing mode, and is subjected to filtration treatment by adopting a two-stage plate type combined filtration or plate-added pipe type combined filtration device, wherein the hydrogen content of the melt after the treatment is required to be less than or equal to 0.13ml/100gAl, and the total content control range of inclusions is between 0.008 and 0.029mm ² /kg; in the process of preparing and homogenizing the casting rod, a semi-continuous casting process is adopted to prepare a solid casting rod or a hollow casting rod, then the rod blank is sawed into round cake blanks with the thickness range of 50-350mm to be deformed along the vertical axis direction, and the solid casting rod is sliced for punching. The method comprises the steps of placing the slice blanks at intervals by adopting a chain type homogenizing furnace, and carrying out continuous homogenizing heat treatment, wherein the homogenizing treatment furnace is divided into two areas, namely two-stage homogenizing regulation and control, and when 6××alloy is selected, the temperature range of one area is 550-560 ℃, and the residence time is as follows: 5-15h, wherein the second zone is 570-590 ℃, and the residence time is as follows: 1-3h; when selecting a 7× series alloy, the one zone temperature range is 440 ℃ to 460 ℃ and the residence time is: 6-20h, the temperature of the second zone is 470-500 ℃, and the residence time is as follows: 1-5h; after homogenization treatment is finished, the annular blank is cooled to the temperature of 200-400 ℃ at the rapid cooling rate of 80-200 ℃/h, and is directly subjected to ring rolling forming; in the ring rolling forming and spinning deformation process, rolling and deforming the annular blank with the thickness range of 50-350mm on a ring rolling machine along the radial direction, wherein the outer diameter is gradually increased, and the radial deformation is more than 60%; heating the high-strength 6 XX-series or 7 XX-series aluminum alloy component with the ring rolled to 50-350 ℃ for hot spinning deformation, and spinning into the required wheel section profile of the tire bead and the tread; and after the completion, performing solid solution and aging heat treatment to perform performance strengthening and anodic oxidation to perform surface coloring treatment to obtain the spoke type motorcycle wheel.

2. The method for manufacturing a high-strength spoke-type motorcycle wheel according to claim 1, wherein when the raw material is selected to be 6× alloy, the spoke-type motorcycle wheel after heat treatment and surface treatment is bright in color, has a circumferential tensile strength ranging from 335MPa to 400MPa, and an elongation ranging from 11% to 15%; when the raw material is selected to be 7X alloy, the spoke type motorcycle wheel after heat treatment and surface treatment is colorful and bright according to the preparation method and main working procedures, the circumferential tensile strength is 550M-580MPa, and the elongation is 10-15%.