WO2015188543A1 - 高镁铝合金商用车轮毂的制造方法 - Google Patents

高镁铝合金商用车轮毂的制造方法 Download PDF

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WO2015188543A1
WO2015188543A1 PCT/CN2014/088474 CN2014088474W WO2015188543A1 WO 2015188543 A1 WO2015188543 A1 WO 2015188543A1 CN 2014088474 W CN2014088474 W CN 2014088474W WO 2015188543 A1 WO2015188543 A1 WO 2015188543A1
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aluminum alloy
magnesium aluminum
wheel hub
manufacturing
temperature
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PCT/CN2014/088474
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English (en)
French (fr)
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朱其柱
王新春
丁荣辉
李书通
濮近发
茅海波
林枭雄
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浙江巨科实业股份有限公司
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Publication of WO2015188543A1 publication Critical patent/WO2015188543A1/zh

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00Hubs

Definitions

  • the present invention relates to a method of manufacturing a hub, and more particularly to a method of manufacturing a high-magnesium aluminum alloy commercial wheel hub.
  • the Al-Mg-Si alloy cast rod is usually used as a raw material, and the billet is preheated, and the forging is required to be upset and multiple forged, and after the hub is formed It is necessary to strengthen the aluminum alloy through the solid solution and the effect of the long day, which has the disadvantages of complicated process, long production cycle, low material utilization rate and high energy consumption.
  • the technical problem to be solved by the present invention is to provide a method for manufacturing a high-magnesium aluminum alloy commercial wheel hub, which can solve the problems of complicated technology, low production efficiency and high energy consumption in the prior art, thereby reducing energy consumption and improving The purpose of production efficiency.
  • the technical solution of the method for manufacturing a high-magnesium aluminum alloy commercial wheel hub of the present invention comprises the following steps:
  • the first step preparing materials
  • the raw material high-magnesium aluminum alloy hot-rolled sheet is made into a ring-shaped blank
  • the high-magnesium aluminum alloy hot-rolled sheet is produced by hot-rolling a high-magnesium aluminum alloy ingot. Hot rolling treatment The method is as follows: the rolling temperature is 440 ° C ⁇ 500 ° C, and the finishing temperature is 300 ° C ⁇ 350 ° C.
  • the high magnesium aluminum alloy is an aluminum alloy having a Mg content of ⁇ 4%.
  • the high-magnesium aluminum alloy hot-rolled sheet has a thickness of 30 mm to 65 mm.
  • the annular billet is drawn into a disk shape to obtain a disc-shaped blank
  • the deep drawing is cold drawing, warm drawing or hot drawing.
  • the number of forgings is 1 to 2 times.
  • the temperature of the forging is ⁇ the recrystallization temperature of the high magnesium aluminum alloy material.
  • the amount of deformation of the forging is 5 ⁇ 3 ⁇ 4 ⁇ 40 ⁇ 3 ⁇ 4.
  • the fourth step spin forming
  • the forged aluminum alloy wheel blank is strongly spun under the recrystallization temperature to form a rim portion, to obtain a hollow rotating body hub blank;
  • the temperature of the spinning is ⁇ the recrystallization temperature of the high magnesium aluminum alloy material.
  • the hollow rotating body hub blank after spin forming is kept at a temperature of 100 ° C to 250 ° C for 0.5 to 6 hours.
  • the aluminum alloy hub blank after the stabilization treatment is machined and surface-treated to obtain an aluminum alloy wheel finished product.
  • the invention improves the raw materials used for the aluminum alloy wheel hub, and does not use the as-cast Al-Mg-Si aluminum alloy bar material as a raw material, so as to simplify the process, so that no need for upsetting before spin forming , punching precast blanks and other processes, no need for solid solution treatment after spin forming.
  • the aluminum alloy hot-rolled sheet selected by the present invention is formed by hot rolling of an ingot. After the ingot is hot rolled, the grains are refined and extended, so that the crystal orientation tends to be uniform, and the shrinkage and porosity are compacted.
  • hot rolling is processing at a temperature higher than the recrystallization temperature, an annealing effect such as recovery or recrystallization occurs when the metal is plastically deformed.
  • coarse grains in the as-cast state can be broken, microcracks can be healed, casting defects can be reduced or eliminated, and the as-cast microstructure can be transformed into a dense fibrous deformation structure, thereby achieving an effect of improving the alloy structure.
  • the obtained product performance can at least achieve the equivalent performance of the original product, simplifying the process of the same, still Can guarantee the performance of the product even higher.
  • the invention replaces the Al-Mg-Si heat-treated reinforced aluminum alloy by the high-strength high-magnesium aluminum alloy, and does not require a heat treatment strengthening process, which not only simplifies the process steps, improves the production efficiency, but also achieves the purpose of reducing energy consumption.
  • the present invention greatly improves the process steps by improving the raw materials used for the aluminum alloy wheels without the processes of upsetting, punching preforms, solid solution and the like. Achieve the goal of reducing energy consumption and increasing production efficiency.
  • the invention adopts a relatively thin aluminum alloy hot-rolled sheet with a fibrous deformation structure as a raw material to directly spin or draw into a disc-shaped blank, and the manufacturing process of the forged aluminum alloy wheel with the existing cast rod-shaped blank Compared with the preheating temperature required for the billet and the short preheating time, the energy consumption can be significantly reduced and the production efficiency can be improved.
  • the invention adopts Al-Mg non-heat-treat reinforced aluminum alloy, and the high-magnesium-aluminum alloy can be work hardened by low-temperature forging and spinning, and high strength is obtained, thereby obtaining a product with better mechanical properties.
  • FIGS. 1a and 1b are schematic views of a toroidal blank prepared by the method for manufacturing a high-magnesium aluminum alloy commercial wheel hub of the present invention; wherein FIG. 1a is a cross-sectional view of FIG.
  • FIG. 2a and 2b are schematic views of a disc-shaped blank prepared by the present invention; wherein FIG. 2a is a cross-sectional view of FIG. 2b
  • FIG. 3a and 3b are schematic views of a forged aluminum alloy wheel blank prepared by the present invention; wherein FIG. 3a is a cross-sectional view of FIG. 3b; 4a and 4b are schematic views of a hollow rotating body hub blank prepared by the present invention; wherein FIG. 4a is a cross-sectional view of FIG. 4b;
  • FIG. 5 is a schematic view showing a process of spinning a circular billet into a disc-shaped billet by using a spinning machine
  • FIG. 6 is a schematic view showing a process of drawing a toroidal billet into a disc-shaped billet by using a punching machine
  • FIG. 7 is a schematic view of a disc-shaped blank before forging by a forging press
  • FIG. 8 is a schematic view of forging a disc-shaped blank into a forged aluminum alloy hub blank by using a forging press
  • FIG. 9 is a schematic view of a forging aluminum alloy wheel blank before spinning by a spinning machine
  • FIG. 10 is a schematic view of a forging press of an aluminum alloy wheel hub blank into a hollow rotating body hub blank using a spinning machine
  • the method for manufacturing a high-magnesium aluminum alloy commercial wheel hub of the present invention comprises the following steps:
  • the first step preparing materials
  • the high-magnesium aluminum alloy hot-rolled sheet is made by hot-rolling a high-magnesium aluminum alloy ingot
  • the specific hot rolling treatment method is: hot magnesium alloy ingot is hot rolled, the rolling temperature is 440 ° C
  • the finishing temperature is 300 ° C ⁇ 350 ° C;
  • the present invention performs hot rolling treatment on a high-magnesium aluminum alloy ingot at a recrystallization temperature or higher, which can improve the structure of the alloy and improve the properties of the alloy.
  • the high magnesium aluminum alloy is an aluminum alloy having a Mg content of ⁇ 4%; preferably a 5 series aluminum alloy such as 5182, 5083, 5A05, 5A06.
  • the thickness of the high-magnesium aluminum alloy hot-rolled sheet is preferably 30 mm to 65 mm in accordance with the requirements of the size of the hub.
  • the present invention ensures sufficient strength after final shaping of the hub by controlling the Mg content of the high magnesium aluminum alloy.
  • the annular billet is drawn into a disk shape to obtain a disc-shaped blank as shown in FIGS. 2a and 2b;
  • the drawing may be cold drawing, warm drawing or hot drawing.
  • the drawing is performed by means of hot spinning and hot stamping.
  • FIG. 7 to FIG. 8 are schematic diagrams showing a process of forging a disc-shaped blank into a forged aluminum alloy hub blank by using a forging press;
  • the number of forgings is 1 to 2 times;
  • the amount of deformation of the forging is S ⁇ , preferably? . ⁇ ? . ⁇ ;
  • forging is performed by a warm forging method.
  • the present invention produces work hardening of an aluminum alloy by controlling the forging temperature to increase the strength of the aluminum alloy, thereby obtaining higher mechanical properties of the spoke portion.
  • the fourth step spin forming
  • FIG. 10 is a schematic view showing a process of spinning a forged aluminum alloy wheel blank into a hollow rotating body hub blank by using a powerful spinning machine
  • the spin spinning is performed by a warm spinning method, and the spinning temperature is ⁇ the recrystallization temperature of the high magnesium aluminum alloy material;
  • the hollow rotating body hub blank after spin forming is kept at a temperature of 100 ° C to 250 ° C for 0.5 to 6 hours.
  • the invention stabilizes the performance of the high-magnesium-aluminum alloy by the low-temperature stabilization treatment; does not require the high-temperature solid solution and the effect process between the long turns, greatly simplifies the process steps, can significantly reduce the energy consumption, and improves the production. effectiveness.
  • Machining and surface treatment methods are: edge removal, sanding, polishing and painting.
  • the 5083 aluminum alloy hot-rolled sheet is punched out into an outer diameter of the outer diameter ⁇ 800 ⁇ inner diameter (D260mm annular billet; [0076] the annular billet is preheated to 380 ° C, and the spinning is deepened into a disk shape;
  • the cooled disc-shaped blank is placed in a forging die, and the spoke portion is cold-forged with a forging press;
  • the forged aluminum alloy wheel blank is heated to 150 ° C, the forging aluminum alloy wheel blank is spun on the spinning machine into a hollow rotating body hub blank;
  • the hollow rotating body hub blank is further insulated in a continuous annealing furnace at 200 ° C for 1 hour; finally, the hub is machined and subsequently surface treated to obtain an automobile aluminum alloy wheel product.
  • the aluminum alloy wheel hub obtained in the above embodiment is selected for corresponding mechanical performance test, and respectively sampled in different parts of the hub, the rim and the spoke portion are round bar tensile degree sample, d6x30 is selected ; the rim portion is stretched by sheet. For the sample, the width ⁇ 0 is selected, the thickness is the original thickness of the rim, and the tensile test is carried out according to the test standard of GB/T228-2002.
  • Table 1 is the test result of the aluminum alloy wheel obtained by the preparation method of the embodiment. The specific test results are shown in Table 1. Show.
  • the present invention uses a high-magnesium aluminum alloy, and its strength still satisfies the performance requirements.
  • the aluminum alloy wheel hub produced by the present invention is mainly applied to the automobile field.
  • the wheel hub of the present invention is not limited to the wheel hub of the automobile field, and can be used as a hub of the related art.

Abstract

一种高镁铝合金商用车轮毂的制造方法,包括以下步骤:第一步,将原料高镁铝合金热轧板制成圆环状坯料;第二步,将圆环状坯料拉深,得到圆盘状坯料;第三步,将冷却至再结晶温度以下的圆盘状坯料的轮辐部分进行锻压,得到锻压铝合金轮毂毛坯;第四步,将锻压铝合金轮毂毛坯旋压成空心旋转体轮毂毛坯;第五步,对空心旋转体轮毂毛坯低温稳定化处理;第六步,机加工及表面处理。高镁铝合金商用车轮毂的制造方法可以解决现有的工艺复杂、生产效率低和能耗高的问题,达到降低能耗、提高生产效率、且产品具有较好力学性能的目的。

Description

说明书 发明名称:高镁铝合金商用车轮毂的制造方法 技术领域
[0001] 本发明涉及一种轮毂的制造方法, 具体涉及一种高镁铝合金商用车轮毂的制造 方法。
背景技术
[0002] 目前, 汽车工业正朝着轻量、 高速、 安全、 节能、 舒适与环境污染轻的方向发 展, 因此铝合金零部件在汽车中的用量日益增多。 轮毂作为汽车行驶系统中的 重要部件之一, 也是一种要求较高的保安件, 它不仅承载汽车的重量, 同吋也 体现着汽车的外观造型。 在过去的十年中, 全球铝合金汽车轮毂产量的年平均 增长率达 7.6%。 由此可见, 随着汽车轻量化的需求日益扩大, 铝合金轮毂在现 代汽车制造中正逐步取代传统的钢制轮毂而被广泛地推广应用。
[0003] 但是, 现有的锻造铝合金商用车轮毂技术中, 通常以 Al-Mg-Si合金铸棒为原材 料, 坯料预热吋间长, 需进行镦粗及多次锻造, 且轮毂成形后需经过长吋间的 固溶及吋效对铝合金进行强化, 具有工艺复杂, 生产周期长, 材料利用率低, 能耗高等缺点。
技术问题
[0004] 本发明所要解决的技术问题是提供一种高镁铝合金商用车轮毂的制造方法, 它 可以解决现有技术工艺复杂, 生产效率低和能耗高的问题, 达到降低能耗, 提 高生产效率的目的。
问题的解决方案
技术解决方案
[0005] 为解决上述技术问题, 本发明高镁铝合金商用车轮毂的制造方法的技术解决方 案为, 包括以下步骤:
[0006] 第一步, 备料;
[0007] 将原料高镁铝合金热轧板制成圆环状坯料;
[0008] 所述高镁铝合金热轧板采用高镁铝合金铸锭经过热轧处理制成。 所述热轧处理 的方法为: 幵轧温度为 440°C〜500°C, 终轧温度为 300°C〜350°C。
[0009] 所述高镁铝合金为 Mg含量≥4%的铝合金。
[0010] 所述高镁铝合金热轧板的厚度为 30mm〜65mm。
[0011] 第二步, 拉深;
[0012] 采用旋压机或冲压机, 将圆环状坯料拉深成盘状, 得到圆盘状坯料;
[0013] 拉深为冷拉深、 温拉深或热拉深。
[0014] 第三步, 锻压;
[0015] 将冷却至再结晶温度以下的圆盘状坯料放入锻压模具中, 用锻压机对轮辐部分 进行锻压, 得到锻压铝合金轮毂毛坯;
[0016] 锻压的次数为 1〜2次。
[0017] 锻压的温度≤高镁铝合金材料的再结晶温度。
[0018] 锻压的变形量为 5<¾〜40<¾。
[0019] 第四步, 旋压成形;
[0020] 在旋压机上, 将锻压铝合金轮毂毛坯在再结晶温度以下进行强力旋压, 形成轮 辋部分, 得到空心旋转体轮毂毛坯;
[0021] 旋压的温度≤高镁铝合金材料的再结晶温度。
[0022] 第五步, 稳定化处理;
[0023] 将旋压成形之后的空心旋转体轮毂毛坯在 100°C〜250°C温度下保温 0.5〜6小吋
, 实现低温稳定化处理;
[0024] 第六步, 机加工及表面处理;
[0025] 将稳定化处理之后的铝合金轮毂毛坯进行机加工及表面处理, 得到铝合金轮毂 成品。
发明的有益效果
有益效果
[0026] 本发明可以达到的技术效果是:
[0027] 本发明通过对铝合金轮毂所用的原料进行改进, 不采用铸态的 Al-Mg-Si铝合金 棒料为原料, 以达到简化工艺的目的, 使在旋压成形前实现无需镦粗、 冲孔预 制坯料等工序, 旋压成形后无需固溶吋效处理过程。 [0028] 本发明选用的铝合金热轧板是由铸锭经热轧而成。 铸锭经热轧后, 晶粒被细化 延伸, 使晶向趋于一致, 缩孔和疏松被压实。 由于热轧是在再结晶温度以上的 加工, 在金属发生塑性变形的同吋, 会发生恢复、 再结晶等退火作用。 通过热 轧能将铸造状态的粗大晶粒破碎, 显微裂纹愈合, 减少或消除铸造缺陷, 将铸 态组织转变为致密的纤维状变形组织, 从而达到了改善合金组织结构的效果。 更重要的是, 通过改进采用铝合金热轧板为原料, 加工过程中无需镦粗、 冲孔 预制坯料步骤, 得到的产品性能至少能够达到原有产品的相当性能, 简化工艺 的同吋, 仍然能够保证产品的性能甚至更高。
[0029] 本发明通过高强度的高镁铝合金替代 Al-Mg-Si热处理强化铝合金, 无需热处理 强化工艺, 不仅简化了工艺步骤, 提高了生产效率, 而且能够达到降低能耗目 的。 与现有采用铸棒制备铝轮毂技术相比, 本发明通过对铝合金轮毂所用的原 料进行改进, 无需经过镦粗、 冲孔预制坯料、 固溶吋效等过程, 大大简化了工 艺步骤, 以达到降低能耗, 提高生产效率的目的。
[0030] 本发明采用相对较薄的具有纤维状变形组织的铝合金热轧板为原料直接旋压或 拉深成盘状坯料, 与现有采用铸态棒状坯料的锻造铝合金轮毂制造工艺相比, 坯料所需的预热温度低、 预热吋间短, 能够明显减少能源消耗量, 提高生产效 率。
[0031] 本发明采用 Al-Mg不可热处理强化铝合金, 通过低温锻压、 旋压能够使高镁铝 合金产生加工硬化, 获得较高的强度, 从而得到具有较好力学性能的产品。 对附图的简要说明
附图说明
[0032] 下面结合附图和具体实施方式对本发明作进一步详细的说明:
[0033] 图 la、 图 lb是本发明高镁铝合金商用车轮毂的制造方法所制备的圆环状坯料的 示意图; 其中图 la是图 lb的剖面图;
[0034] 图 2a、 图 2b是本发明所制备的圆盘状坯料的示意图; 其中图 2a是图 2b的剖面图
[0035] 图 3a、 图 3b是本发明所制备的锻压铝合金轮毂毛坯的示意图; 其中图 3a是图 3b 的剖面图; [0036] 图 4a、 图 4b是本发明所制备的空心旋转体轮毂毛坯的示意图; 其中图 4a是图 4b 的剖面图;
[0037] 图 5为采用旋压机将圆环状坯料旋压拉深成圆盘状坯料的过程示意图;
[0038] 图 6为采用冲压机将圆环状坯料冲压拉深成圆盘状坯料的过程示意图;
[0039] 图 7为采用锻压机对圆盘状坯料进行锻压之前的示意图;
[0040] 图 8为采用锻压机将圆盘状坯料锻压成锻压铝合金轮毂毛坯的示意图;
[0041] 图 9为采用旋压机对锻压铝合金轮毂毛坯进行旋压之前的示意图;
[0042] 图 10为采用旋压机将锻压铝合金轮毂毛坯旋压成空心旋转体轮毂毛坯的示意图
本发明的实施方式
[0043] 本发明高镁铝合金商用车轮毂的制造方法, 包括以下步骤:
[0044] 第一步, 备料;
[0045] 根据轮毂的大小计算所需坯料的体积, 将原料高镁铝合金热轧板冲裁成如图 la
、 图 lb所示的圆环状坯料;
[0046] 高镁铝合金热轧板采用高镁铝合金铸锭经过热轧处理制成;
[0047] 具体热轧处理的方法为: 将高镁铝合金铸锭进行热轧处理, 幵轧温度为 440°C
〜500°C, 终轧温度为 300°C〜350°C;
[0048] 本发明在再结晶温度以上对高镁铝合金铸锭进行热轧处理, 能够改善合金的组 织结构, 提高合金的性能。
[0049] 高镁铝合金为 Mg含量≥4%的铝合金; 优选 5182、 5083、 5A05、 5A06等 5系铝 合金。
[0050] 高镁铝合金热轧板的厚度, 根据轮毂尺寸的要求, 优选为 30mm〜65mm。
[0051] 本发明通过控制高镁铝合金中 Mg的含量, 以保证轮毂最终成形后拥有足够的 强度。
[0052] 第二步, 拉深;
[0053] 采用如图 5所示的旋压机或如图 6所示的冲压机, 将圆环状坯料拉深成盘状, 得 到如图 2a、 图 2b所示的圆盘状坯料; [0054] 拉深可以为冷拉深、 温拉深或热拉深。
[0055] 优选采用热旋压及热冲压的方式进行拉深。
[0056] 第三步, 锻压;
[0057] 将冷却至再结晶温度以下的圆盘状坯料放入锻压模具中, 用锻压机对轮辐部分 进行锻压以产生加工硬化, 得到如图 3a、 图 3b所示的锻压铝合金轮毂毛坯;
[0058] 如图 7至图 8为采用锻压机将圆盘状坯料锻压成锻压铝合金轮毂毛坯的过程示意 图;
[0059] 锻压的次数为 1〜2次;
[0060] 锻压的温度≤高镁铝合金材料的再结晶温度;
[0061] 锻压的变形量为 S^ ^ , 优选?。^〜?。^;
[0062] 优选采用温锻方式进行锻压。
[0063] 本发明通过控制锻压温度使铝合金产生加工硬化, 以提高铝合金强度, 从而使 轮辐部分获得较高的力学性能。
[0064] 第四步, 旋压成形;
[0065] 将锻压铝合金轮毂毛坯加热至不高于高镁铝合金材料的再结晶温度, 在旋压机 上将锻压铝合金轮毂毛坯旋压成如图 4a、 图 4b所示的空心旋转体轮毂毛坯;
[0066] 如图 9至图 10为采用强力旋压机将锻压铝合金轮毂毛坯旋压成空心旋转体轮毂 毛坯的过程示意图;
[0067] 优选采用温旋方式进行强力旋压成形, 旋压温度≤高镁铝合金材料的再结晶温 度;
[0068] 第五步, 稳定化处理;
[0069] 将旋压成形之后的空心旋转体轮毂毛坯在 100°C〜250°C温度下保温 0.5〜6小吋
, 实现低温稳定化处理;
[0070] 本发明通过低温稳定化处理, 可以保证高镁铝合金性能的稳定; 无需长吋间的 高温固溶及吋效等过程, 大大简化了工艺步骤, 能够明显减少能源消耗量, 提 高生产效率。
[0071] 第六步, 机加工及表面处理;
[0072] 将稳定化处理之后的铝合金轮毂毛坯进行机加工及表面处理, 得到铝合金轮毂 成品;
[0073] 机加工及表面处理方法为: 去边、 打磨、 抛光和涂装。
实施例
[0074] 以一个 22.5英寸的汽车铝合金轮毂为例:
[0075] 将 5083铝合金热轧板冲裁成尺寸为外径 Φ800ηηη内径 (D260mm的圆环状坯料; [0076] 将圆环状坯料预热到 380°C, 旋压拉深成盘状;
[0077] 将冷却后的圆盘状坯料放入锻压模具中, 用锻压机对轮辐部分进行冷锻;
[0078] 将锻压铝合金轮毂毛坯加热至 150°C, 在旋压机上将锻压铝合金轮毂毛坯旋压 成空心旋转体轮毂毛坯;
[0079] 再将空心旋转体轮毂毛坯在 200°C的连续退火炉中保温 lh; 最后对轮毂进行机 加工及后续表面处理, 得到汽车铝合金轮毂产品。
[0080] 选取上述实施例得到的铝合金轮毂进行相应的力学性能测试, 分别在轮毂不同 部分进行取样, 轮缘和轮辐部位采用圆棒拉伸度样, 选用 d6x30; 轮辋部位采用 片状拉伸试样, 选用宽度 Μ0, 厚度为轮辋原始厚度, 具体按照 GB/T228-2002检 测标准进行拉伸试验, 表 1是实施例制备方法得到的铝合金轮毂的测试结果, 具 体试验结果如表 1所示。
[XXXX [0081] 表 1
[0082] 与传统商用车铝轮毂一般采用 6XXX热处理强化铝合金相比, 本发明采用高镁 铝合金, 其强度仍然满足性能要求。
[0083] 本发明所制得的铝合金轮毂主要应用于汽车领域, 当然本发明的轮毂并不仅限 于汽车领域的轮毂, 作为相关领域的轮毂均可。
[0084] 本发明中所描述的具体实施例仅是对本发明精神作举例说明。 本发明所属技术 领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类 似的方式替代, 但并不会偏离本发明的精神或者超越所附权利要求书所定义的 范围。

Claims

权利要求书
[权利要求 1] 一种高镁铝合金商用车轮毂的制造方法, 其特征在于, 包括以下 步骤:
第一步, 备料; 将原料高镁铝合金热轧板制成圆环状坯料; 第二步, 拉深;
采用旋压机或冲压机, 将圆环状坯料拉深成盘状, 得到圆盘状坯 料;
第三步, 锻压;
将冷却至再结晶温度以下的圆盘状坯料放入锻压模具中, 用锻压 机对轮辐部分进行锻压, 得到锻压铝合金轮毂毛坯;
第四步, 旋压成形;
在旋压机上, 将锻压铝合金轮毂毛坯在再结晶温度以下进行强力 旋压, 形成轮辋部分, 得到空心旋转体轮毂毛坯;
第五步, 稳定化处理;
将旋压成形之后的空心旋转体轮毂毛坯在 100°C〜250°C温度下保 温 0.5〜6小吋, 实现低温稳定化处理;
第六步, 机加工及表面处理;
将稳定化处理之后的铝合金轮毂毛坯进行机加工及表面处理, 得 到铝合金轮毂成品。
[权利要求 2] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第一步中的高镁铝合金热轧板采用高镁铝合金铸锭经 过热轧处理制成。
[权利要求 3] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述热轧处理的方法为: 幵轧温度为 440°C〜500°C, 终轧 温度为 300°C〜350°C。
[权利要求 4] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第一步中的高镁铝合金为 Mg含量≥4%的铝合金。
[权利要求 5] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第一步中的高镁铝合金热轧板的厚度为 30mm〜65mm
[权利要求 6] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第二步的拉深为冷拉深、 温拉深或热拉深。
[权利要求 7] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第三步锻压的次数为 1〜2次。
[权利要求 8] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第三步锻压的温度≤高镁铝合金材料的再结晶温度。
[权利要求 9] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第三步锻压的变形量为 5%〜40%。
[权利要求 10] 根据权利要求 1所述的高镁铝合金商用车轮毂的制造方法, 其特征 在于, 所述第四步旋压的温度≤高镁铝合金材料的再结晶温度。
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