WO2015188548A1

WO2015188548A1 - Method for manufacturing high-magnesium aluminum alloy commercial wheel hub

Info

Publication number: WO2015188548A1
Application number: PCT/CN2014/088481
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: WO2015188543A1; CN104015005A

Abstract

Provided is a method for manufacturing a high-magnesium aluminum alloy commercial wheel hub, comprising the following steps: step 1: forming into annular blanks a feedstock high-magnesium aluminum alloy hot-rolled sheet; step 2: the annular blanks are deep drawn to obtain disc-shaped blanks; step 3: the disc-shaped blanks are cooled to below the recrystallization temperature, then the spoke parts of the disc-shaped blanks are forged to obtain forged aluminum alloy wheel hub blanks; step 4: the forged aluminum alloy wheel hub blanks are spun into hollow rotating body wheel hub blanks; step 5: the hollow rotating body wheel hub blanks are stabilized at low temperature; step 6: machining and surface treatment. The high-magnesium aluminum alloy commercial wheel hub manufacturing method resolves the problems of the complexity of existing techniques, low production efficiency, and high energy consumption, and achieves the objectives of reduced power consumption, increased production efficiency, and good mechanical properties of the product.

Description

Description: The manufacturing method of high-magnesium aluminum alloy commercial wheel hub

[0001] 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.

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, in the existing forged aluminum alloy commercial wheel hub technology, 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.

technical problem

[0004] 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.

Problem solution

Technical solution

[0005] In order to solve the above technical problem, the technical solution of the method for manufacturing a high-magnesium aluminum alloy commercial wheel hub of the present invention comprises the following steps:

[0006] The first step, preparing materials;

[0007] The raw material high-magnesium aluminum alloy hot-rolled sheet is made into a ring-shaped blank;

[0008] 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.

[0009] The high magnesium aluminum alloy is an aluminum alloy having a Mg content of ≥ 4%.

[0010] The high-magnesium aluminum alloy hot-rolled sheet has a thickness of 30 mm to 65 mm.

[0011] the second step, drawing deep;

[0012] using a spinning machine or a punching machine, the annular billet is drawn into a disk shape to obtain a disc-shaped blank;

[0013] The deep drawing is cold drawing, warm drawing or hot drawing.

[0014] the third step, forging;

[0015] The disk-shaped blank cooled to a temperature below the recrystallization temperature is placed in a forging die, and the spoke portion is forged by a forging press to obtain a forged aluminum alloy wheel blank;

[0016] The number of forgings is 1 to 2 times.

[0017] The temperature of the forging is ≤ the recrystallization temperature of the high magnesium aluminum alloy material.

[0018] The amount of deformation of the forging is 5<3⁄4~40<3⁄4.

[0019] The fourth step, spin forming;

[0020] on the spinning machine, 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;

[0021] The temperature of the spinning is ≤ the recrystallization temperature of the high magnesium aluminum alloy material.

[0022] The fifth step, the stabilization process;

[0023] 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.

, to achieve low temperature stabilization treatment;

[0024] The sixth step, machining and surface treatment;

[0025] The aluminum alloy hub blank after the stabilization treatment is machined and surface-treated to obtain an aluminum alloy wheel finished product.

Advantageous effects of the invention

Beneficial effect

The technical effects that can be achieved by the present invention are:

[0027] 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. [0028] 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. Since 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. By hot rolling, 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. More importantly, by improving the use of aluminum alloy hot-rolled sheet as raw material, there is no need to upset and punch the preform in the process, and 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.

[0029] 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. Compared with the prior art for manufacturing aluminum wheel hubs by using cast rods, 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.

[0030] 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.

[0031] 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. Brief description of the drawing

DRAWINGS

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0033] 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.

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

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;

[0037] FIG. 5 is a schematic view showing a process of spinning a circular billet into a disc-shaped billet by using a spinning machine;

[0038] FIG. 6 is a schematic view showing a process of drawing a toroidal billet into a disc-shaped billet by using a punching machine;

[0039] FIG. 7 is a schematic view of a disc-shaped blank before forging by a forging press;

[0040] FIG. 8 is a schematic view of forging a disc-shaped blank into a forged aluminum alloy hub blank by using a forging press;

[0041] FIG. 9 is a schematic view of a forging aluminum alloy wheel blank before spinning by a spinning machine;

[0042] 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

Embodiments of the invention

[0043] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub of the present invention comprises the following steps:

[0044] The first step, preparing materials;

[0045] According to the size of the hub to calculate the volume of the required blank, the raw material high-magnesium aluminum alloy hot-rolled sheet is punched into the figure la

, the annular blank shown in Figure lb;

[0046] The high-magnesium aluminum alloy hot-rolled sheet is made by hot-rolling a high-magnesium aluminum alloy ingot;

[0047] The specific hot rolling treatment method is: hot magnesium alloy ingot is hot rolled, the rolling temperature is 440 ° C

~500 ° C, the finishing temperature is 300 ° C ~ 350 ° C;

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The present invention ensures sufficient strength after final shaping of the hub by controlling the Mg content of the high magnesium aluminum alloy.

[0052] the second step, drawing deep;

[0053] using a spinning machine as shown in FIG. 5 or a punching machine as shown in FIG. 6, the annular billet is drawn into a disk shape to obtain a disc-shaped blank as shown in FIGS. 2a and 2b; [0054] The drawing may be cold drawing, warm drawing or hot drawing.

[0055] Preferably, the drawing is performed by means of hot spinning and hot stamping.

[0056] the third step, forging;

[0057] The disc-shaped blank cooled to a temperature below the recrystallization temperature is placed in a forging die, and the spoke portion is forged by a forging press to produce work hardening, thereby obtaining a forged aluminum alloy wheel blank as shown in FIGS. 3a and 3b;

[0058] 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;

[0059] The number of forgings is 1 to 2 times;

[0060] the temperature of forging ≤ the recrystallization temperature of the high magnesium aluminum alloy material;

[0061] The amount of deformation of the forging is S^^, preferably? . ^~? . ^;

[0062] Preferably, forging is performed by a warm forging method.

[0063] 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.

[0064] The fourth step, spin forming;

[0065] heating the forged aluminum alloy wheel blank to a recrystallization temperature not higher than the high magnesium aluminum alloy material, and spinning the forged aluminum alloy wheel blank into a hollow rotating body as shown in FIG. 4a and FIG. 4b on a spinning machine. Hub blank

9 to 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;

[0067] Preferably, 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;

[0068] The fifth step, the stabilization process;

[0069] 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.

, to achieve low temperature stabilization treatment;

[0070] 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.

[0071] the sixth step, machining and surface treatment;

[0072] Machining and surface treatment of the aluminum alloy hub blank after the stabilization treatment to obtain an aluminum alloy wheel hub Finished product

[0073] Machining and surface treatment methods are: edge removal, sanding, polishing and painting.

Example

[0074] Take a 22.5 inch automobile aluminum alloy wheel as an example:

[0075] The 5083 aluminum alloy hot-rolled sheet is punched out into an outer diameter of the outer diameter Φ800ηηη inner diameter (D260mm annular billet; [0076] the annular billet is preheated to 380 ° C, and the spinning is deepened into a disk shape;

[0077] The cooled disc-shaped blank is placed in a forging die, and the spoke portion is cold-forged with a forging press;

[0078] 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;

[0079] 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.

[0080] 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 Μ0 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.

[XXXX [0081] Table 1

[0082] Compared with the conventional commercial vehicle aluminum wheel hub, which is generally made of a 6XXX heat-treated reinforced aluminum alloy, 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. 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 a high-magnesium aluminum alloy commercial wheel hub, comprising the steps of:

The first step is to prepare the material; the raw material high-magnesium aluminum alloy hot-rolled sheet is made into a ring-shaped blank; the second step is to deepen;

Using a spinning machine or a punching machine, the annular billet is drawn into a disk shape to obtain a disc-shaped billet;

The third step, forging;

The disk-shaped blank cooled to a temperature lower than the recrystallization temperature is placed in a forging die, and the spoke portion is forged by a forging press to obtain a forged aluminum alloy wheel blank;

The fourth step, spin forming;

On the spinning machine, the forged aluminum alloy wheel blank is strongly spun under the recrystallization temperature to form a rim portion, and a hollow rotating body hub blank is obtained;

The fifth step, stabilization processing;

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 to achieve low temperature stabilization treatment;

The sixth step, machining and surface treatment;

The aluminum alloy wheel blank after the stabilization treatment is machined and surface-treated to obtain a finished aluminum alloy wheel.

[Claim 2] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the high-magnesium aluminum alloy hot-rolled sheet in the first step is heated by a high-magnesium aluminum alloy ingot Made by rolling treatment.

[Claim 3] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the hot rolling treatment method is: rolling temperature is 440 ° C to 500 ° C, finishing rolling The temperature is from 300 ° C to 350 ° C.

[Claim 4] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the high-magnesium aluminum alloy in the first step is an aluminum alloy having a Mg content of ≥ 4%.

[Claim 5] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the high-magnesium aluminum alloy hot-rolled sheet in the first step has a thickness of 30 mm to 65 mm.

[Claim 6] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the drawing of the second step is cold drawing, warm drawing or hot drawing.

[Claim 7] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the number of times of the third step forging is 1 to 2 times.

[Claim 8] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the temperature of the third step forging is ≤ the recrystallization temperature of the high magnesium aluminum alloy material.

[Claim 9] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the deformation amount of the third step forging is 5% to 40 < 3⁄4.

[Claim 10] The method for manufacturing a high-magnesium aluminum alloy commercial wheel hub according to claim 1, wherein the temperature of the fourth step spinning is ≤ the recrystallization temperature of the high magnesium aluminum alloy material.