WO2015188550A1

WO2015188550A1 - Method for manufacturing al-mg-si alloy wheel hub

Info

Publication number: WO2015188550A1
Application number: PCT/CN2014/088497
Authority: WO
Inventors: 朱其柱; 王新春; 丁荣辉; 李书通; 濮近发; 茅海波; 林枭雄
Original assignee: 浙江巨科实业股份有限公司
Priority date: 2014-06-13
Filing date: 2014-10-13
Publication date: 2015-12-17
Also published as: CN104015011A

Abstract

Provided is a method for manufacturing an Al-Mg-Si alloy wheel hub, comprising the following steps: step 1: forming an Al-Mg-Si alloy hot-rolled sheet into round-plate-shaped blanks; step 2: the round-plate-shaped blanks are heated to 450°C-500°C for preheating; step 3: the round-plate-shaped blanks are hot-forged at 450°C-500°C to form disk-shaped blanks; step 4: the hot-forged disk-shaped blanks are quenched; step 5: the quenched disk-shaped blanks are shaped by means of power spinning in a spinning machine, forming hollow rotating body wheel hub blanks; step 6: the wheel hub blanks shaped by spinning are heated at 500°C-580°C for 1-4 hours, quenched, then placed into an aging furnace and heated at 120°C-220°C for 2-8 hours; step 7: machining and surface treatment. The strength of the aluminum wheel hubs is improved, their good plasticity is retained, and the objectives of reducing power consumption and improving production efficiency are achieved.

Description

Method for manufacturing Al-Mg-Si alloy wheel hub

[0001] The present invention relates to a method of manufacturing a hub, and more particularly to a method of manufacturing an Al-Mg-Si alloy hub

Background technique

[0002] At present, the automotive industry is developing in the direction of light weight, high speed, safety, energy saving, comfort and environmental pollution, so the use of aluminum alloy parts in automobiles is increasing. As one of the important components in the car's driving system, the hub is also a demanding security component. It not only carries the weight of the car, but also reflects the appearance of the car. Over the past decade, global aluminum alloy wheel production has grown at an average annual rate of 7.6%. It can be seen that with the increasing demand for lightweight vehicles, aluminum alloy wheels are being widely used in modern automobile manufacturing to gradually replace traditional steel wheels.

[0003] However, the existing forged aluminum alloy wheel hub is usually made of Al-Mg-Si alloy cast rod as a raw material, and has a complicated process, such as upsetting, initial forging, precision forging, punching, solid solution, and enthalpy effect. High energy consumption and relatively low mechanical properties of the hub.

technical problem

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing an Al-Mg-Si alloy wheel hub, which can improve the strength of the aluminum hub, maintain its good plasticity, and achieve the purpose of reducing energy consumption and improving production efficiency.

Problem solution

Technical solution

[0005] In order to solve the above technical problem, the technical solution of the manufacturing method of the Al-Mg-Si alloy wheel hub of the present invention is

, including the following steps:

[0006] The first step, preparing materials;

[0007] forming an Al-Mg-Si alloy hot rolled sheet into a disk-shaped blank;

[0008] The Al-Mg-Si alloy hot-rolled sheet is produced by hot-rolling an Al-Mg-Si alloy ingot.

[0009] The Al—Mg—Si alloy is preferably a deformed aluminum alloy such as 6061 or 6082. [0010] The Al-Mg-Si alloy hot rolled sheet has a thickness of 50 mm to 150 mm.

[0011] the second step, preheating;

[0012] The wafer-shaped blank is preheated to 450 ° C ~ 500 ° C;

[0013] The third step, hot forging;

[0014] The wafer-shaped blank is hot forged by a forging press at a temperature of 450 ° C to 500 ° C to form a disk-shaped blank, and the hub is initially formed; the number of hot forging is 1 to 2 times.

[0015] Before hot forging, the forging die is preheated to above 250 ° C, the upper die is separated from the lower die, the lubricant is sprayed on the working surface of the forging die, and the preheated disk-shaped blank is placed into the forging. In the mold.

[0016] the fourth step, quenching;

[0017] The hot forged disc-shaped blank is subjected to a quenching treatment; the quenching is performed immediately after the hot forging is completed.

[0018] The fifth step, spin forming;

[0019] The quenched disc-shaped blank is strongly spun by a powerful spinning machine to form a hollow rotating body hub blank;

[0020] The spinning pressure may be cold spinning, warm spinning or hot spinning.

[0021] The sixth step, solid solution heat treatment;

[0022] The spin-formed hub blank is heated to 500 ° C ~ 580 ° C, after 1 ~ 4 hours of heat preservation, quenching, and then placed in a furnace to heat to 120 ° C ~ 220 ° C, insulation 2 ~ 8 Xiao Yan;

[0023] seventh step, machining and surface treatment;

[0024] The hub blank subjected to solid solution heat treatment is machined and surface treated to obtain an aluminum alloy wheel hub.

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[0025] The machining and surface treatment methods are: edge removal, sanding, polishing and painting.

Advantageous effects of the invention

Beneficial effect

[0026] 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 Precast blank process.

[0027] The aluminum alloy hot-rolled sheet selected by the invention is formed by hot rolling of the ingot; after the ingot is hot-rolled, the crystal grains are refined and extended, so that the crystal orientation tends to be uniform, and the shrinkage hole and the looseness are compacted. Because hot rolling is above the recrystallization temperature Processing, in the plastic deformation of the metal, recovery, recrystallization and other annealing effects; through the hot rolling can break the coarse grains in the cast state, microcrack healing, reduce or eliminate casting defects, the as-cast microstructure It is a dense and uniform fibrous deformation structure, thereby achieving the effect of improving the microstructure of the alloy. More importantly, the invention adopts aluminum alloy hot-rolled sheet as raw material, and does not need to be used for the process of roughing the preform in the process, and can simplify the process and reduce the energy consumption, and still can ensure the performance of the product is higher.

[0028] The present invention reduces the driving force for recrystallization of the alloy by quenching immediately after hot forging, so that the subsequent solid solution is obtained in the same state of obtaining superhigh saturation of the alloy element, and only less recrystallization occurs. In the subsequent effect process, a higher precipitation strengthening effect is produced, and the mechanical properties of the alloy are improved.

Brief description of the drawing

DRAWINGS

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

1 is a schematic flow chart of a method for manufacturing an Al-Mg-Si alloy wheel hub of the present invention;

2 is a schematic view of hot forging of a wafer-shaped blank using a forging press;

3a and 3b are schematic views of a disk-shaped blank obtained by hot forging; wherein FIG. 3a is a cross-sectional view of FIG. 3b [0033] FIG. 4 is a schematic view of strong spinning of a disk-shaped blank by a spinning machine. ;

5a and 5b are schematic views of a hollow rotating body hub blank obtained by strong spinning; wherein FIG. 5a is a cross-sectional view of FIG. 5b.

Embodiments of the invention

[0035] As shown in FIG. 1, the manufacturing method of the Al-Mg-Si alloy hub of the present invention comprises the following steps:

[0036] the first step, preparing materials;

[0037] Calculating the volume of the required blank according to the size of the hub, and forming the Al-Mg-Si alloy hot-rolled sheet into a round blank

[0038] The Al-Mg-Si alloy hot-rolled sheet is formed by hot-rolling an Al-Mg-Si alloy ingot;

[0039] The Al—Mg—Si alloy is preferably a deformed aluminum alloy such as 6061 or 6082;

[0040] The thickness of the Al-Mg-Si alloy hot-rolled sheet, according to the requirements of the size of the hub, preferably 50mm~150mm;

[0041] The second step, preheating; [0042] The wafer-shaped blank is heated to 450 ° C ~ 500 ° C for pre-heat treatment;

[0043] The purpose of preheating is to improve the plasticity of the aluminum alloy, reduce the deformation resistance of the aluminum alloy during the forging process, and thereby facilitate the plastic deformation of the aluminum alloy;

[0044] The third step, hot forging;

[0045] Before forging, the forging die is preheated to above 250 ° C, the upper die is separated from the lower die, the lubricant is sprayed on the working surface of the forging die, and the preheated disk-shaped blank 11 is placed into the forging. In the mold, as shown in Figure 2;

[0046] The wafer-shaped blank 11 placed in the forging die is hot forged by a forging press at a temperature of 450 ° C to 500 ° C to form a disk-shaped blank as shown in FIGS. 3 a and 3 b to make the initial hub Forming; hot forging times 1~2 times

[0047] The present invention uses a pellet-shaped billet made of a hot-rolled sheet as a raw material, which does not require a plurality of pre-forging treatments (equivalent to upsetting) before forging forming, and the forging forming crucible also reduces the number of forgings correspondingly. It greatly simplifies the production process and improves production efficiency.

[0048] The fourth step, quenching;

[0049] quenching the hot forged disc-shaped blank, and quenching is performed immediately after the hot forging is completed;

[0050] The quenching may be spray quenching, quenching quenching, strong wind quenching, etc.; wherein the quenching and quenching temperature is 40 to 90. C _;

[0051] Quenching can inhibit static recrystallization of aluminum alloy after high temperature thermal deformation, and prevent the crystal grains from continuing to grow.

[0052] The present invention reduces the driving force of recrystallization of the alloy by hot forging and quenching, so that the subsequent solid solution is obtained in the same state of obtaining the supersaturation of the alloy element supersaturation, and only less recrystallization occurs, thereby A higher precipitation strengthening effect is produced during the effect process, and the mechanical properties of the alloy are improved.

[0053] The fifth step, spin forming;

[0054] As shown in FIG. 4, the quenched disc-shaped blank is strongly spun by a strong spinning machine to form a hollow rotating body hub blank as shown in FIGS. 5a and 5b;

[0055] The spinning may be cold spinning, warm spinning or hot spinning;

[0056] The sixth step, solid solution heat treatment;

[0057] The spin-formed hub blank is heated to 500 ° C ~ 580 ° C, insulation 11! After ~4h, quenching treatment, and then placed in a furnace to heat to 120 ° C ~ 220 ° C, 2 ~ 8h; [0058] The quenching in this step may also be spray quenching, quenching quenching, strong air quenching, etc.; wherein quenching quenching temperature is 40~90 ° C;

[0059] By solid solution heat treatment, the strengthening phase in the aluminum alloy can be precipitated, thereby improving the strength of the aluminum alloy

[0060] seventh step, machining and surface treatment;

[0061] The hub blank subjected to solid solution heat treatment is machined and surface treated to obtain an aluminum alloy wheel hub.

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Ππ ;

[0062] Machining and surface treatment methods are: edge removal, sanding, polishing and painting.

Example

[0063] The 6061 aluminum alloy hot-rolled sheet is punched into a disk-shaped blank having a size of Φ350χ65ιηιη;

[0064] preheating the wafer blank to 500 ° C;

[0065] Before the forging operation, the forging die is preheated to 250 ° C or more in 20 minutes, the upper die is separated from the lower die, and the lubricant is sprayed on the working surface of the forging die, and the preheated wafer is prepared. The blank is placed in a forging die, and forging is performed twice by a forging press to form a disk-shaped blank, so that the hub is initially formed into a disk shape; immediately after forging, it is placed in water for quenching treatment;

[0066] The quenched disc-shaped blank is placed on a powerful spinning machine to be strongly spun into a hollow rotating body hub blank; then the hollow rotating body hub blank is heated to 520 ° C in a solution furnace, and kept for 2.5 h. After quenching, after quenching, the aluminum hub blank is placed in a aging furnace and heated to 175 ° C for 8 h. Finally, the hub blank is machined and subsequently surface treated to obtain automotive aluminum alloy wheel products.

Comparative Example 1

[0068] The 6061 aluminum alloy hot-rolled sheet is punched into a disk-shaped blank having a size of Φ350χ65ιηιη;

[0069] preheating the wafer blank to 500 ° C;

[0070] Before the forging work, the forging die is preheated to 250 ° C or more in 20 minutes, the upper die is separated from the lower die, and the lubricant is sprayed on the working surface of the forging die, and the preheated wafer is prepared. The blank is placed in a forging die, and forging is performed twice by a forging press to form a disk-shaped blank, so that the hub is initially formed into a disk shape;

[0071] Then, the disc-shaped blank is placed on a strong spinning machine to be strongly spun into a hollow rotating body hub blank; then the hollow rotating body hub blank is heated to 520 ° C in a solid solution furnace, and then quenched after being kept for 2.5 hours. After quenching, the aluminum hub blank is placed in a aging furnace and heated to 175 ° C for 8 h; finally, the hub blank is machined and Subsequent surface treatment to obtain automotive aluminum alloy wheel products.

Comparative Example 2

[0073] Calculating the volume of the required blank according to the size of the hub, cutting the as-cast 6061 aluminum alloy bar of Φ250 ιηιη into a cylindrical blank; cleaning the blank, removing the oil, heating the billet to 460 ° C for 35 minutes, keeping the heat 70 minutes, forging under the forging press to Φ350ιηιη, to obtain a pellet-shaped blank; the wafer-shaped blank obtained above was again placed in a heating furnace and heated to 480 ° C for pre-heat treatment for 35 minutes;

[0074] Before the forging forming, the forging die is preheated to 420 ° C for 20 minutes, then the upper die is separated from the lower die, and the lubricant is sprayed on the working surface of the forging die to pass the high temperature preheating circle. The sheet material is placed in a forging die, and is pressed by a forging press to form a disk-shaped forging blank; the disk-shaped forging blank is punched; the punched forged blank material is heated to 350 ° C, in a spinning machine The forged blank is spun into a hollow rotating body hub; the spinning blank is heated to 520 ° C in a solid solution furnace, and after quenching for 2.5 h, quenching is performed, and after quenching, the aluminum hub is placed in a furnace to be heated to 175 ° C, heat preservation 8h; After heat treatment, the hub is machined and subsequently surface treated to obtain automotive aluminum alloy wheel products.

[0075] The aluminum alloy wheel hub products obtained in the above embodiments and the comparative example 1 and the comparative example 2 were selected to perform corresponding mechanical performance tests, and respectively, sampling was performed on different parts of the hub, and the rim and the spoke portion were subjected to a round bar tensile degree sample. D6x30 is used _{; the} rim part is made of sheet-like tensile specimen, the width Μ0 is selected, and the thickness is the original thickness of the rim. The tensile test is carried out according to the test standard of GB/T228-2002. Table 1 is the preparation method of the examples and comparative examples. The test results of the aluminum alloy wheel hub are shown in Table 1.

[XXXX [0076] Table 1

The aluminum alloy wheel hub produced by the present invention is mainly applied to the automobile field. Of course, 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.

The specific embodiments described in the present invention are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

Claims

Claim

[Claim 1] A method for manufacturing an Al-Mg-Si alloy hub, comprising the following steps: preparing a first step;

Forming a hot rolled sheet of Al-Mg-Si alloy into a round sheet blank;

The second step, preheating;

Preheating the wafer blank to 450 ° C ~ 500 ° C;

The third step, hot forging;

The wafer-shaped blank is hot forged by a forging press at a temperature of 450 ° C to 500 ° C to form a disk-shaped blank to initially form the hub;

The fourth step, quenching;

The hot forged disc-shaped blank is quenched;

The fifth step, spin forming;

The quenched disc-shaped blank is strongly spun by a spinning machine to form a hollow rotating body hub blank;

The sixth step, solid solution heat treatment;

The spin-formed hub blank is heated to 500 ° C ~ 580 ° C, after 1 ~ 4 hours of heat preservation, quenching, and then placed in a furnace to heat to 120 ° C ~ 220 ° C, 2 ~ 8 hours of heat preservation; The seventh step, machining and surface treatment;

The hub blank subjected to solid solution heat treatment is machined and surface treated to obtain an aluminum alloy wheel finished product.

[Claim 2] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The Al-Mg-Si alloy hot-rolled sheet in the first step is formed by hot-rolling an Al-Mg-Si alloy ingot.

[Claim 3] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The Al-Mg-Si alloy in the first step is a 6061, 6082 deformed aluminum alloy.

[Claim 4] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The thickness of the Al-Mg-Si alloy hot-rolled sheet in the first step is 50 mm to 150 mm.

[Claim 5] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The number of hot forgings in the third step is 1 to 2 times.

[Claim 6] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

Before the hot forging in the third step, the forging die is preheated to above 250 ° C, the upper die is separated from the lower die, and the lubricant is sprayed on the working surface of the forging die, and the preheated wafer is sprayed. The blank is placed in a forging die.

[Claim 7] A method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The fourth step of quenching is performed immediately after the hot forging is completed.

[Claim 8] The method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The spinning pressure in the fifth step is cold rotation, warm rotation or hot rotation.

[Claim 9] A method of manufacturing an Al-Mg-Si alloy hub according to claim 1, wherein

The machining and surface treatment methods in the seventh step are: edge removal, sanding, polishing and painting.