A preparation method for a high-strength spoke-type motorcycle wheel

Abstract

The present invention provides a preparation method for a high-strength spoke-type motorcycle wheel. Low-carbon processed aluminum waste or recycled aluminum waste is added, and the rest are pure aluminum ingots and alloy ingots, which are configured into an aluminum alloy melt. After the melt is degassed and filtered, it is prepared into a solid casting rod or a hollow ingot blank. It is sawn transversely into slices of a certain thickness. Among them, the center of the solid casting rod slice is punched, and after the inner and outer surfaces of the hollow casting rod slice are milled, ring rolling forming is carried out. After ring rolling, it is made into the shape of a spoke-type wheel through spin forming, and after heat treatment and surface treatment, a spoke-type motorcycle wheel is made. By adopting the process method of the present invention, when configured into a 6-series alloy, the tensile strength value reaches 330 MPa and the elongation rate reaches 12%; when configured into a 7-series alloy, the tensile strength value is greater than 550 MPa and the elongation rate is greater than 13%. The wheel has excellent performance, a high degree of light weight, and is beautiful and bright after anodizing treatment, fully meeting the characteristics of thin, beautiful, and cool of the spoke-type wheel.

Description

Technical Field

[0001] The present invention relates to a method for preparing a high-strength spoke-type motorcycle wheel, belonging to the field of aluminum alloy wheel preparation. Background Art

[0002] The motorcycle was first invented by German Gottlieb Daimler in 1885, with a history of more than 100 years. The frame of the original motorcycle was made of wood, and the wheels were also wooden, with a layer of iron sheet wrapped around the outer layer of the wheels. After the 1930s, the design and development of motorcycles gradually matured and were widely used in transportation, racing, and military applications. In recent decades, in order to adapt to diverse appearance designs, lightweight aluminum alloy wheels have gradually replaced steel wheels and are increasingly popular among young people. Currently, the lightweight aluminum alloy wheels used for motorcycles are divided into two types: integral type and spoke type from the assembly form. The spoke type belongs to the classic motorcycle wheel assembly form. When the hub encounters a strong impact, the impact force will be dispersed to numerous spokes and dissipated along the gaps between the spokes. Therefore, the spoke type wheels or hubs are more suitable for off-road motorcycles or ADV models. Off-road motorcycles are mainly used on non-paved roads such as mountains, jungles, swamps, deserts, and gobi. Due to the particularity of the use environment, the spoke type wheels have very high requirements for the strength, anti-pull-off force, lightweight, and appearance of the hub structure, which also puts forward higher requirements for the materials and forming processes of the spoke type motorcycle wheels. At the same time, with the improvement of environmental protection requirements and the establishment of the low-carbon ecological city index system, the low-carbon preparation concept and realization of the whole process of urban transportation preparation have also attracted more and more attention. The spoke type motorcycle hub materials are mainly 6 series Al-Mg-Si series and 7 series Al-Zn-Mg-Cu series aluminum alloys. On the premise of ensuring the lightweight of the wheel weight, colored anodic surface treatment can be realized to meet the characteristics of motorcycles being light, easy to operate, and beautiful.

[0003] Looking at the existing spoke-type wheel materials and forming methods, Patent CN1053620C discloses a spoke-type light alloy motorcycle wheel. The selected material is primary aluminum alloy containing copper, magnesium, manganese, chromium, and silicon elements. The adopted forming process scheme is to extrude aluminum alloy profiles, and then form them through processes such as circularizing, welding into a circle, heat treatment, punching, and coloring. Patent CN101298121A discloses a primary aluminum alloy containing silicon, iron, and magnesium, which is formed by gravity casting in one piece. However, for this material and process, the tensile strength of the wheel is only about 214 MPa, which does not meet the requirements of the ultra-thin structure of the spoke-type wheel and the anti-spoke pull-off force. Patent CN106222498A discloses an aluminum alloy plate for motorcycle wheels and its preparation method. The aluminum alloy thick plate material is prepared by using pure aluminum with an element content of Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and a purity greater than 99.7%. After being rolled thinner, it is circularized and welded into a motorcycle wheel hub. The aluminum alloy material used is a primary aluminum alloy plate. Existing spoke-type motorcycle wheel hubs all use primary aluminum alloy materials, and the preparation process is relatively complex and the process flow is long. Whether it is circularizing extrusion materials or circularizing plates, welding is ultimately required for forming, which also puts higher requirements on the weldability of the materials and the weld strength. The applicability and versatility of the materials and processes are restricted. Summary of the Invention

[0004] To solve the deficiencies of the existing process technologies and improve the material selectivity and lightweight effect of spoke-type motorcycle wheels, the purpose of the present invention is to provide a method for preparing spoke-type motorcycle wheels with high strength, mainly including raw material selection and hub preparation processes. The selected addition ratio of the raw materials is 40% - 100% renewable waste aluminum materials, and the balance is pure aluminum ingots and master alloy ingots. After melting and purification treatment, semi-continuous casting is used to prepare casting rods, which are immediately subjected to ring rolling deformation after homogenization, and then the bead and tread structures are prepared by hot spinning. Finally, the entire wheel is prepared into a finished spoke-type wheel after heat treatment strengthening and surface coloring treatment for subsequent punching and assembly.

[0005] To achieve the above purposes, the production process of the present invention is realized through the following technical solutions and steps:

[0006] (1) Raw material selection: Select processed aluminum waste or recycled aluminum waste with an addition ratio of 40% - 100%, and the balance is pure aluminum ingots and master alloy ingots, and configure them into 6 series or 7 series aluminum alloy melt raw materials in a melting furnace. When the alloy material is 6 When it is an aluminum alloy system, the element ratios are satisfied as follows: 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 is Al, and the remaining elements are regarded as impurities with a content of less than 0.1%. When the alloy material is 7 When it is a 7xxx aluminum alloy system, the element ratios are satisfied as follows: 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 is Al, and the remaining elements are regarded as impurities with a content of less than 0.05%.

[0007] (2) Preparation method: The preparation method of the present invention mainly includes: material melting and melt treatment, ingot preparation and homogenization, ring rolling and hot spinning deformation, heat treatment, and surface treatment and other main processes. Different from the casting or forging deformation and forming methods of traditional wheel preparation, the control elements and innovation points of each preparation process of the present invention are as follows:

[0008] A. Melt melting: The raw materials are melted in a melting furnace with electromagnetic stirring function. During the melting process, the melt in the furnace is driven by the electromagnetic stirrer to rotate clockwise or counterclockwise in the furnace. Relying on the rotation function, the temperature of the melt in the furnace is made uniform, and during the melting stage, the melt temperature at any position in the furnace is not higher than 730 - 750 °C, so as to prevent a high temperature from occurring in a certain area during the melting process due to the addition of 40% - 100% of processed aluminum scrap or recycled aluminum scrap, causing oxygen in the air to react with aluminum to generate a large amount of Al2O3 particles, thereby affecting the mechanical properties and elongation of the wheel, as well as the bright color quality of anodic oxidation.

[0009] B. Degassing and Filtration Treatment: Compared with using primary aluminum ingots as raw materials, after selecting a certain proportion of processed aluminum scrap and recycled aluminum scrap in the present invention, due to their larger specific surface area than primary aluminum ingots and the fact that their surfaces often adhere to substances such as oil stains, oxides, and salt particles, a large amount of hydrogen and oxide inclusions released by the decomposition of water vapor and oil stains will be mixed into the aluminum alloy melt after melting, resulting in relatively high hydrogen content and inclusion content values in the melt. To prevent the corresponding increase in the hydrogen content of the melt caused by too high a proportion of added aluminum scrap, which in turn affects the mechanical and fatigue impact resistance of the wheels, this method uses a composite series degassing method to remove hydrogen from the melted metal aluminum alloy melt, that is, a trough degassing is connected in series with a box-type double-rotor degassing or two box-type double-rotor degassers are connected in series, or a box-type degasser is connected in series with a vacuum degasser to perform combined hydrogen removal treatment on the melt. And after filtering the melt by using a double-stage plate filtration or a combined filtration device of plate plus tube, the semi-continuous casting process is carried out. It is required that the hydrogen content of the treated melt ≤ 0.13 ml / 100 g Al, and the total inclusion content control range is between 0.008 - 0.029 mm 2 / kg.

[0010] C. Semi-continuous Casting and Homogenization: The aluminum alloy billets for the wheels to be processed are prepared by semi-continuous casting process. The casting rods are solid casting rods with a diameter greater than 200 mm or hollow casting rods with an inner diameter greater than 100 mm. After casting, several round cake billets with a thickness of 50 - 350 mm are sawn along the vertical axis direction and are to be homogenized and rolled and deformed subsequently. If the billet is a solid casting rod, after being sawn into circular billets to be deformed, a punching process with a diameter greater than 100 mm is carried out at the center and then homogenization is carried out. According to the types of alloy materials and process requirements, the sliced billets are placed at intervals and a chain-type homogenization furnace is used to carry out continuous homogenization heat treatment on the billets. The homogenization treatment furnace is a two-zone double-stage homogenization control. When selecting 6 series alloys, the temperature range of the first zone is 550°C - 560°C, residence time: 5 - 15 h, the second zone is 570°C - 590°C, residence time: 1 - 3 h; when selecting 7 series alloys, the temperature range of the first zone is 440°C - 460°C, residence time: 6 - 20 h, the temperature of the second zone is 470°C - 500°C, residence time: 1 - 5 h. Placing the billets at intervals during the homogenization treatment can improve the homogenization efficiency of the billets, shorten the time and prevent overburning. The chain-type homogenization furnace can use chain drive to make the billets pass through two temperature control intervals in the furnace in turn, thus completing the continuous two-stage homogenization process. Compared with the traditional method of homogenizing the casting rod first and then sawing, this method has higher homogenization efficiency for the annular billets, shorter required time, and can realize the step-by-step continuous two-stage homogenization process of the billets, ensuring the homogenization effect of the materials used for the wheels.

[0011] D. Ring rolling deformation and hot spinning forming: After the homogenization treatment, the ring blank is quickly cooled to the range of 200℃-400℃ at a cooling rate of 80℃ / h-200℃ / h, and directly ring rolling is carried out. During ring rolling, the blank rotates in the circumferential direction under the friction of the forming roller of the ring rolling machine. As the rolling proceeds, the diameter of the ring blank gradually increases and the thickness gradually decreases. The radial processing deformation rate is ensured to be greater than 60% to allow the cast structure to be fully processed and deformed. When the outer diameter and thickness of the workpiece reach the required size requirements of the wheel, the ring rolling is completed. The high-strength 6 System or 7 It is an aluminum alloy component, heated to 50℃-350℃ for hot spinning deformation. System or 7 The aluminum alloy has high plasticity and can be spun into the cross-sectional shape required for the tire lip and tread without cracking. Compared with the traditional spoke-type wheel aluminum alloy material through extrusion or forging molding process, the wheel prepared by ring rolling can ensure that the wheel structure is compressed in the radial direction while bearing the tensile force in the circumferential direction. The deformation direction of the aluminum alloy micro-grains is along the circumference of the wheel and the entire wheel is continuous and consistent. There is no metallurgical welding line or grain streamline inconsistent with the circumferential organizational defects. This micro-grain structure meets the strict requirements of spoke-type motorcycle wheels for lightweight structure and high load-bearing capacity. At the same time, the recycled aluminum raw materials used in the present invention inevitably contain coarse impurity phase particles containing Fe, Mn, Si, etc. These particle phase structures are more easily broken under the strong deformation conditions of ring rolling spinning. Therefore, this molding method can allow the material to contain relatively more impurity elements without reducing product performance, and the adaptability and selection space of raw materials are greater.

[0012] E. Heat treatment and surface treatment: After spinning, according to the process system requirements of the selected aluminum alloy material, the wheel is strengthened by solid solution and aging heat treatment to improve the strength and elongation of the wheel, ensure the light weight requirements and impact resistance and fatigue resistance, and the surface is anodized to meet the customer's requirements for beautiful and cool spoke-type motorcycle wheels.

[0013] The spoke type motorcycle wheel prepared by the material and process of the present invention has a bright and colorful surface. When the alloy is used, its circumferential tensile strength ranges from 335 MPa to 400 MPa, and its elongation ranges from 11% to 15%. When it is alloyed, its circumferential tensile strength ranges from 550M-580MPa and its elongation is 10-15%.

[0014] Compared with the prior art, the present invention has the following positive and beneficial effects:

[0015] (1) The aluminum alloy material used in the present invention uses processed aluminum waste or recycled aluminum waste with an addition ratio of 40% - 100% to replace the traditional process that can only select pure aluminum ingots and aluminum processing waste with a proportion not exceeding 20%. The range of selectable raw materials is wider. According to the measurement of the carbon footprint of aluminum processing, the present invention can use low-carbon aluminum processing waste or recycled waste to replace the method of preparing spoked wheels by relying on high-carbon primary aluminum ingots. Under the industry background of carbon peak and carbon neutrality in China, the spoked aluminum wheels of motorcycles can achieve low-carbon green manufacturing.

[0016] (2) Compared with the traditional processing methods of spoked wheels using extrusion welding or forging deformation, after the present invention uses a casting rod to be prepared by punching, ring rolling and spinning forming, the wheel structure has the characteristics of uniform force deformation along the annular bearing direction, sufficient grain crushing and a microstructural organization that changes uniformly along the circumference. While achieving high strength and strong radial impact resistance, the product strength and plasticity loss caused by the selection of recycled aluminum materials are compensated by circumferential uniform severe plastic deformation. While realizing the characteristics of green and low-carbon, the requirements of high strength and high toughness of spoked wheels are achieved through the circumferential overall deformation process.

[0017] (3) The melt treatment process described in the present invention uses an efficient composite degassing and combined filtration slag removal method, effectively solving the problem of excessive hydrogen content and oxide inclusion content in the melt caused by adding 40% - 100% of processed aluminum waste or recycled aluminum waste during the casting process. The casting rod has a dense structure, no pores and microshrinkage defects, providing high-quality billets without macroscopic defects for the subsequent processing of wheels, and can significantly improve the fatigue resistance life of wheel products.

[0018] (4) The present invention uses a heat treatment method of double-stage homogenization in a chain step-by-step homogenization furnace for the cast rod slices. Compared with the overall homogenization of the cast rod in the traditional process and then sawing and forming, the homogenization time required by the process method of the present invention is short and the homogenization effect is sufficient. After homogenization, direct hot processing deformation is carried out using the waste heat, realizing the continuity and integration of the homogenization and ring rolling deformation processes, with a more compact production rhythm and higher energy utilization rate.

[0019] (5) For the spoked motorcycle wheel products prepared by the present invention, when selecting a 6 series alloy, on the premise that the impurity Fe element content is as high as 0.12% - 0.31%, the circumferential tensile strength value of the product is greater than 335 MPa and the elongation is greater than 11%; when selecting a 7 series alloy, on the premise that the impurity Fe element content is as high as 0.12% - 0.31%, the circumferential tensile strength value of the product is greater than 550 MPa and the elongation is greater than 10%. The overall performance of the wheel is excellent, with a high degree of light weight. After anodic treatment, the surface is beautiful and bright, and the performance and appearance meet the characteristics of light, beautiful and cool of spoked motorcycle wheels. Brief Description of the Drawings

[0020] Figure 1 It is a photo of the prepared wheel. Detailed Description of the Invention

[0021] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0022] Embodiment 1

[0023] Select 75% aluminum processing waste and 23% pure aluminum ingots as raw materials, add less than 1% of aluminum-silicon master alloy, aluminum-manganese master alloy, aluminum-chromium master alloy and magnesium ingots into the melting furnace to melt, and configure an alloy melt with Si content of 0.85%; Mg content of 0.76%; Mn content of 0.41%; Fe content of 0.18%; Cr content of 0.12%; and the balance being Al. Melt in a melting furnace with electromagnetic stirring function at the bottom of the furnace, and keep the melting temperature at 740 °C to ensure that the temperature of the aluminum liquid is uniform and there is no local high-temperature phenomenon, and there is no phenomenon of a large amount of oxides being involved in the melt.

[0024] To prevent the increase in the hydrogen content and oxide inclusion content of the melt caused by the too high proportion of 75% processed aluminum waste, which affects the quality of the wheel product. After the configured alloy melt is melted, stirred and refined, a combined degassing treatment method of a trough degasser in series with a double-rotor box degasser is used to degas the melt, and 40-mesh / 60-mesh double-stage plate filtration is used to remove inclusions from the melt to purify the melt. After the treatment, the hydrogen content of the melt is 0.125 ml / 100 gAl, and the total inclusion content in the melt after offline detection of the filtration box is 0.023 mm / kg. 2 / kg.

[0025] The treated melt is used to prepare a casting rod with a diameter of 250 mm by means of double-drainage strong cooling oil-gas lubricated casting disk. The internal microcrystalline grain size of the casting rod is Grade 1, and there are no microscopic porosity and pore defects. Saw several round cake slices with a thickness of 150 mm along the direction perpendicular to the length of the casting rod, and turn a through hole in the center of each round cake slice. After completion, the center hole diameter is 120 mm. According to the configured Requirements for the alloy products: The sliced billets are placed in a chain-step homogenizing furnace at intervals for homogenization treatment. Through zoned temperature control, a two-zone and two-stage homogenization treatment is carried out. The billets with internal through-holes respectively experience the heating and holding processes in Zone 1 and Zone 2 in the homogenizing furnace along with the chain drive. The homogenization temperature in Zone 1 is 550 °C with a residence time of 6 h, and in Zone 2 is 575 °C with a residence time of 2 h. After the required homogenization time is completed, the billets are removed from the homogenizing furnace. At this time, the billet temperature range is 400 - 500 °C, and they are rapidly cooled to within 300 °C at a cooling rate of 200 °C / h and directly subjected to ring rolling processing deformation.

[0026] During the ring rolling forming process, the billets rotate at high speed under the action of the friction force of the forming rollers of the ring rolling machine. As the rolling progresses, the diameter of the ring-shaped billets gradually increases and the thickness gradually decreases. After the ring rolling deformation ends, the radial processing deformation rate of the billets reaches 75%, and the outer diameter dimension is 541 mm. The ring-shaped billets after ring rolling forming are placed on a spinning machine and spun into the wheel cross-section shape required for the tire bead and tread at a temperature of 35 °C. During the spinning deformation process, the width of the spun billets continuously increases and the thickness further decreases. After spinning is completed, the wheels are respectively subjected to solution treatment at 550 °C / 1 h and aging heat treatment at 165 °C / 10 h, and the mechanical properties of the wheel products are tested. The tensile strength is 335 MPa and the elongation is 12%. The photo of the wheel prepared according to Example 1 is as Figure 1 shown. The wheel performance meets the requirements of customers for the mechanical and strength properties of the spoke-type motorcycle wheels. After the wheels are anodized, the surface is sub-black with a metallic luster, no color difference or dot-like surface defects, meeting the requirements of customers for the product appearance.

[0027] Example 2

[0028] Select 50% of the 7 series aluminum alloy processing waste and 40% of pure aluminum ingots as raw materials, add less than 10% of pure zinc ingots, pure magnesium ingots, pure copper plates, and aluminum-zirconium master alloy, etc. into the melting furnace for melting. The material alloy composition range 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 remaining elements is less than 0.05% of the 7 series aluminum alloy. During the melting process, the bottom electromagnetic stirrer of the furnace is turned on to achieve continuous stirring of the aluminum melt during melting and relatively uniform temperature of the melt in the furnace. The melting temperature range is 730 °C, and at the same time, the flame intensity of the melting furnace is automatically regulated to prevent the local temperature of the aluminum liquid from exceeding 760 °C. During the two refining processes completed in the melting furnace, the melt is poured into the holding furnace for in-furnace rotary degassing and static treatment.

[0029] After melting is completed, the melt is poured into a holding furnace for a 40-minute holding treatment. After skimming the surface scum and oxides, the melt undergoes hydrogen removal treatment through a combined series connection of a trough degasser and a double-rotor box degasser to reduce the hydrogen content in the melt. At the same time, the combined series degassing method can also, to a certain extent, bring the fine oxides in the melt to the melt surface during the degassing process, thereby achieving the purpose of purifying the melt to a certain extent. After degassing treatment, the hydrogen content control value at the outlet of the degassing box is detected to be 0.135 ml / 100 g Al. The melt is filtered using a 40-mesh and 60-mesh double-stage plate filtration method. After filtration, the total inclusion content of the melt is 0.021 mm 2 / kg.

[0030] After degassing and filtration are completed, an oil-gas lubricated mold is used for the preparation of a 250-mm diameter casting rod. The casting speed is 70 mm / min, and the cooling water flow rate is 32 T / h. After the casting rod is prepared, there are no micro-porosity and inclusion defects inside, and the microscopic grain size is 120 μm. After casting, several circular cake slices with a thickness of 180 mm are sawed along the direction perpendicular to the length of the casting rod, and each circular cake slice is machined by turning to form a through-hole in the center. After completion, the center hole diameter is 130 mm. After completion, in accordance with the requirements of the 7 ring blank homogenization treatment process, a chain-driven step homogenization furnace is used for two-zone and two-stage homogenization heat treatment. The treatment temperature is 450 °C for the first-zone ingot temperature and 470 °C for the second-zone ingot temperature. During the homogenization treatment period, the internal through-hole blank undergoes the heating and holding processes in the first zone and the second zone respectively with the chain drive to complete the two-stage homogenization heat treatment. After the treatment is completed, the blank is removed from the homogenization furnace in a hot state and rapidly cooled to 350 °C at a cooling rate of 200 °C / h and directly subjected to ring rolling processing deformation.

[0031] During the ring rolling forming process, the hot-state center through-hole 7 blank rotates at high speed under the friction force of the forming roller of the ring rolling machine and is continuously rolled and deformed. The center hole diameter continuously increases, the blank deforms radially, and the outer diameter dimension also gradually increases with the rolling deformation. As the rolling progresses, the diameter of the ring blank gradually increases, the thickness gradually decreases, and at the same time, as heat is continuously released during the processing deformation, the surface temperature of the blank also increases to 380 °C. After the ring rolling deformation is completed, the radial processing deformation rate of the blank reaches 78%, and the outer diameter dimension increases to 550 mm.

[0032] The ring blank after ring rolling is placed on a spinning machine. Under the combined action of the spinning wheel and the spinning die, 7 The width of the wheel blank continues to increase, and the thickness is further reduced. At the same time, the cross-section of the blank is also spun from a regular rectangle into the arc-shaped groove cross-section required for the wheel bead and tread. After spinning, the wheels are respectively subjected to solution treatment at 460 °C for 1 h, and double-stage aging heat treatment at 120 °C for 12 h + 170 °C for 3 h to complete the hardness and performance regulation of the 7 wheel products. After the wheels are heat-treated, their tensile strength is 570 MPa and the elongation is 12%. After the wheels are anodized, the surface is bright gold, showing a beautiful metallic luster, without surface defects, meeting the various performance requirements of customers for spoke-type high-strength and lightweight motorcycle wheel sets, and realizing the preparation of low-carbon value products for the sports series wheels.

Claims

1. A preparation method of a high-strength spoke-type motorcycle wheel, characterized in that, Including the following steps: (1) Raw material selection: Select 40%-100% of processed aluminum scrap or recycled aluminum scrap, add metallic pure aluminum ingots and alloy ingots with a remainder not higher than 60% and put them into a melting furnace to melt, and configure them into a 6 series alloy, where 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 is Al, and the remaining elements are regarded as impurities with a content less than 0.1%; or configured as a 7 series alloy, where 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 is Al, and the remaining elements are regarded as impurities with a content less than 0.05%; (2) The preparation method includes: material melting and melt treatment, ingot preparation and homogenization, ring rolling and hot spinning deformation, heat treatment and surface treatment; In the process of material melting and melt treatment, the melted aluminum alloy melt is subjected to hydrogen removal treatment by a composite series degassing method, and a double-stage plate combination filter or a plate plus tube combination filter device is used for filtration treatment. It is required that the hydrogen content in the melt after treatment is ≤ 0.13 ml / 100 g Al, and the total inclusion content control range is between 0.008 and 0.029 mm 2 / kg; In the process of ingot preparation and homogenization, a semi-continuous casting process is used to prepare solid ingots or hollow ingots. The ingots are sawed into round cake blanks with a thickness range of 50 - 350 mm along the direction perpendicular to the ingot length. The solid ingot slices are punched. A chain-type homogenization furnace is used to place the sliced blanks at intervals and conduct continuous homogenization heat treatment. The homogenization furnace is a two-zone double-stage homogenization control. When selecting a 6 series alloy, the temperature range of the first zone is 550°C - 560°C, and the residence time is 5 - 15 h. The second zone is 570°C - 590°C, and the residence time is 1 - 3 h. When selecting a 7 series alloy, the temperature range of the first zone is 440°C - 460°C, and the residence time is 6 - 20 h. The temperature of the second zone is 470°C - 500°C, and the residence time is 1 - 5 h. After the homogenization treatment, the ring billet is cooled at a rapid cooling rate of 80 °C / h - 200 °C / h to a temperature range of 200 °C - 400 °C, and is directly subjected to ring rolling forming; in the ring rolling forming and spinning deformation processes, the ring billet with a thickness range of 50 - 350 mm is rolled and deformed radially on a ring rolling machine, the outer diameter gradually increases and the radial deformation amount is greater than 60%; the high-strength 6 series or 7 series aluminum alloy components are heated to a temperature range of 50 °C - 350 °C for hot spinning deformation, and are spun into the wheel cross-section shape required for the tire bead and tread; After completion, solution treatment, aging heat treatment are carried out for performance strengthening, and anodic oxidation is carried out for surface coloring treatment to obtain a spoke-type motorcycle wheel.

2. The preparation method of a high-strength spoke-type motorcycle wheel according to claim 1, characterized in that, Configured as 6 When it is configured as a 6-series alloy, the spoked motorcycle wheel after heat treatment and surface treatment shows a colorful bright color, with its circumferential tensile strength ranging from 335 MPa to 400 MPa and the elongation ranging from 11% to 15%; when configured as 7 When it is configured as a 7-series alloy, the spoked motorcycle wheel after heat treatment and surface treatment shows a colorful bright color, with its circumferential tensile strength ranging from 550 MPa to 580 MPa and the elongation being 10% to 15%.

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