WO2015188547A1

WO2015188547A1 - Method for manufacturing al-mg alloy wheel hub

Info

Publication number: WO2015188547A1
Application number: PCT/CN2014/088480
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: WO2015188544A1; CN103990947A

Abstract

Provided is a method for manufacturing an Al-Mg alloy wheel hub, comprising the following steps: step 1: forming into round-plate-shaped blanks a feedstock Al-Mg alloy hot-rolled sheet; step 2: the round-plate-shaped blanks are heated to 350°C-500°C for preheating; step 3: the preheated round-plate-shaped blanks are placed into a forging die and hot-forged, using a forging press, into disk-shaped blanks; step 4: a power-spinning machine is used to power-spin the disk-shaped blanks to form wheel rim parts, and obtain hollow rotating body wheel hub blanks; alternatively, after the hot forging of step 3 is complete, the disk-shaped blanks are cooled, then power-spun at 250°C or less. Step 5: stabilization; step 6: machining and surface treatment. The feedstock used for the aluminum alloy wheel hubs is modified, the blank preheating temperature is low, and processes such as upsetting and solution aging are not required, and the process steps are greatly simplified; thus the objectives of reducing power consumption and improving production efficiency are achieved, and the product has good mechanical properties.

Description

Title: Method for manufacturing Al-Mg alloy wheel hub

Technical field

[0001] The present invention relates to a method of manufacturing a hub, and more particularly to a method of manufacturing an Al-Mg 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 hubs are usually made of Al-Mg-Si alloy cast rods, and the billets are preheated in the inter-turn length, which requires upsetting and multiple forging, and the hub needs to pass through the long chamber after forming. The solid solution and the effect of strengthening the aluminum alloy have the disadvantages of long production cycle and high energy consumption.

technical problem

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing an Al-Mg alloy 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 production efficiency. the goal of. Problem solution

Technical solution

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

[0006] The first step, preparing materials;

[0007] The raw material Al-Mg alloy hot-rolled sheet is formed into a disk-shaped blank;

[0008] The Al-Mg alloy hot-rolled sheet is formed by hot-rolling an Al-Mg alloy ingot; the hot rolling treatment method is: the rolling temperature is 440 ° C to 500 ° C, the finishing temperature It is from 300 ° C to 350 ° C.

[0009] The Al-Mg alloy is a 5-series aluminum alloy 5052, 5754, 5182, 5083, 5A03, 5A04, 5A05, 5A06.

[0010] The Al-Mg alloy hot rolled sheet has a thickness of 50 mm to 150 mm.

[0011] the second step, preheating;

[0012] The wafer-shaped blank is heated to 350 ° C ~ 500 ° C for pre-heat treatment;

[0013] The preheated turns are determined according to the thickness of the disk-shaped blank, and are lmin/mm to 3 min/mm.

[0014] The third step, hot forging;

[0015] The preheated wafer-shaped blank is placed in a forging die and hot forged into a disk-shaped blank by a forging press;

[0016] The final forging temperature of the hot forging is lower than 350 °C.

[0017] The number of forgings is 1 to 2 times.

[0018] the fourth step, spinning;

[0019] After the hot forging is completed, the disc-shaped blank is strongly spun by a powerful spinning machine to form a rim portion, and a hollow rotating body hub blank is obtained;

[0020] Alternatively, after the third step of hot forging is completed, the disk-shaped blank is first cooled, and then subjected to strong spinning at 250 ° C or lower. The cooling is by strong wind cooling, spray cooling or quench water cooling.

[0021] The invention can directly spin the disc-shaped blank directly after the hot forging to obtain the hollow rotating body hub blank; after the hot forging is completed, the disc-shaped blank can be rapidly cooled, and then at 250 ° C. The following is a strong spinning.

[0022] The fifth step, the stabilization process;

[0023] The hollow rotating body hub blank after spinning is kept at a temperature of 100 ° C to 250 ° C for 0.5 to 4 hours to achieve low temperature stabilization treatment;

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

[0025] The 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

[0026] The invention adopts a relatively thin aluminum alloy hot-rolled thick plate with a fibrous deformation structure as a raw material, and compared with the existing forged aluminum alloy wheel manufacturing process using the as-cast bar-shaped blank, not only the required preheating of the blank is required. The daytime is short, and the subsequent upsetting process is omitted, so that the present invention can not only significantly reduce the energy consumption, but also can simplify the process and improve the production efficiency. [0027] The present invention adopts an Al-Mg non-heat treatable reinforced aluminum alloy, and the aluminum alloy is work hardened by controlling the final forging temperature and the spinning temperature, thereby obtaining a high-strength aluminum alloy wheel hub. Compared with the existing Al-Mg-Si alloy, the high temperature solid solution and heat treatment between the long turns are eliminated, the process steps are greatly simplified, and the energy consumption can be reduced, the production efficiency can be improved, and the product has Better mechanical properties.

Brief description of the drawing

DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] FIGS. 1a and 1b are schematic views of a wafer-shaped blank prepared by the method for manufacturing the Al-Mg alloy hub of the present invention.

Wherein diagram la is a cross-sectional view of Figure lb;

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; [0031] FIGS. 3a and 3b are hollow hollow body hub blanks prepared by the present invention. Schematic; wherein Figure 4a is a cross-sectional view of Figure 4b;

[0032] FIG. 4 is a schematic view of a wafer blank before forging by a forging press;

[0033] FIG. 5 is a schematic view of forging a disk-shaped blank into a disk-shaped blank by using a forging press;

[0034] FIG. 6 is a schematic view of a forged aluminum alloy wheel blank before being spun by a powerful spinning machine;

[0035] FIG. 7 is a schematic view of a forged aluminum alloy wheel blank being spun into a hollow rotating body hub blank using a powerful spinning machine.

Embodiments of the invention

[0036] The method for manufacturing the Al-Mg alloy hub of the present invention comprises the following steps:

[0037] the first step, preparing the material;

[0038] calculating the volume of the required blank according to the size of the hub, the raw material Al-Mg alloy hot-rolled sheet is formed into a disk-shaped blank as shown in FIG.

[0039] The Al-Mg alloy hot-rolled sheet is formed by hot-rolling an Al-Mg alloy ingot; the hot rolling treatment method is

: The rolling temperature is 440 ° C ~ 500 ° C, and the finishing temperature is 300 ° C ~ 350 ° C.

[0040] The Al-Mg alloy is preferably a 5-series aluminum alloy such as 5052, 5754, 5182, 5083, 5A03, 5A04, 5A05, 5A06.

[0041] The Al-Mg alloy hot rolled sheet has a thickness of 50 mm to 150 mm. [0042] The second step, preheating;

[0043] The disc-shaped billet is heated to 350 ° C ~ 500 ° C for pre-heat treatment;

[0044] The preheated crucible is determined to be lmin/mm to 3 min/mm depending on the thickness of the disk-shaped blank.

[0045] The purpose of preheating is to improve the plasticity of the aluminum alloy and reduce the deformation resistance of the aluminum alloy during the forging process, thereby facilitating the plastic deformation of the aluminum alloy.

[0046] The third step, hot forging;

[0047] As shown in FIG. 4 and FIG. 5, the preheated wafer-shaped blank is placed in a forging die and hot forged into a disk-shaped blank as shown in FIG. 2a and FIG. 2b by a forging press;

[0048] Before forging, preheating the forging die to 200 ° C ~ 300 ° C; forging final forging temperature is lower than 350 ° C

The number of forgings is 1 to 2 times.

[0049] The invention adopts a hot-rolled plate as a raw material, and does not need to undergo multiple pre-forging treatments (equivalent to upsetting) before forging forming, and the forging forming boring also reduces the number of forgings correspondingly, thereby greatly simplifying the production process and improving Production efficiency.

[0050] the fourth step, spinning;

[0051] As shown in FIG. 6 and FIG. 7, after the hot forging is completed, the disc-shaped blank is directly subjected to strong spinning by a powerful spinning machine to form a rim portion, and a hollow rotating body as shown in FIG. 3a and FIG. 3b is obtained. Hub blank

[0052] Alternatively, after the third step of hot forging, the disc-shaped blank is rapidly cooled, and then subjected to strong spinning under 250 ° C to form a rim portion to obtain a hollow rotating body hub blank; the cooling method may be strong wind Cool, spray or quench water.

[0053] During the hot forging deformation process, the plastic deformation of the material causes the mechanical recovery of the aluminum alloy to undergo a dynamic recovery and dynamic recrystallization process. After the hot forging, the aluminum alloy still maintains a relatively high temperature, so static occurs. Recovery and static recrystallization, the aluminum alloy continues to soften.

[0054] The aluminum alloy is repeatedly nucleated, finitely grown, and has fine crystal grains during hot deformation. The dynamically recrystallized grains are equiaxed grain structures, the grains are fine, the size is not uniform, the grain boundaries are sawtooth, and the equiaxed equiaxed grains are sub-grains separated by entangled dislocations. Due to the high dislocation density and dislocation entanglement due to work hardening, this structure has higher strength and hardness than static recrystallized structure.

[0055] The present invention can achieve high strength by controlling a lower final forging temperature or rapidly cooling a hot forging blank, thereby suppressing static recrystallization and causing the aluminum alloy to produce a mixed deformation structure that is incompletely recrystallized. [0056] Since the Al-Mg alloy is a non-heat treatable reinforced aluminum alloy, the present invention can produce work hardening of the rim portion by controlling a lower spinning temperature, thereby improving the strength of the aluminum alloy, thereby obtaining higher mechanical properties of the rim portion.

[0057] The fifth step, the stabilization process;

[0058] The hollow rotating body hub blank after spinning is kept at a temperature of 100 ° C to 250 ° C for 0.5 to 4 hours to achieve low temperature stabilization treatment;

[0059] The stability of the Al-Mg alloy can be ensured by the low-temperature stabilization treatment.

[0060] the sixth step, machining and surface treatment;

[0061] The hub blank after the stabilization treatment is machined and surface-treated to obtain an aluminum alloy wheel finished product; [0062] The machining and surface treatment methods are: edge removal, grinding, polishing and painting.

Embodiment 1

[0064] Take a 17-inch automobile aluminum alloy wheel as an example:

[0065] The 5A06 alloy hot-rolled sheet is punched into a disk-shaped blank having a size of <D350×65 mm;

[0066] preheating the wafer blank to 450 ° C; preheating the forging die to 250 after 20 minutes of forging operation

° _C , separating the upper mold from the lower mold, spraying the lubricant on the working surface of the forging die, placing the pre-heated wafer-shaped blank into the forging die, forging once with a forging press to form a disk-shaped blank, The final forging temperature is 320 °C; the disc-shaped blank is directly spun on the powerful spinning machine into a hollow rotating body hub blank; then the hollow rotating body hub blank is kept in a continuous annealing furnace at 150 ° C for 2 h; The blank is machined and subsequently surface treated to obtain automotive aluminum alloy wheel products.

Example 2

[0068] The 5A06 alloy hot-rolled sheet is punched into a disk-shaped blank having a size of <D350x65 mm;

[0069] preheating the wafer blank to 420 ° C; preheating the forging die to 250 after 20 minutes of forging operation

° _C , separating the upper mold from the lower mold, spraying the lubricant on the working surface of the forging die, and then placing the preheated wafer-shaped blank into the forging die, forging twice with a forging press to form a disk shape Billet, final forging temperature 32 0 ° C;

[0070] After hot forging, the disc-shaped billet is rapidly cooled to below 250 ° C by strong wind;

[0071] The forged aluminum alloy wheel blank after strong wind cooling is placed on a strong spinning machine, and is spun into a hollow rotating body hub blank; then the hollow rotating body hub blank is placed in an annealing furnace and heated to 150 ° C for 2 h. ; At last The hub blank is machined and subsequently surface treated to obtain automotive aluminum alloy wheel products.

Example 3

[0073] The 5A06 alloy hot-rolled sheet is punched into a disk-shaped blank having a size of <D350×65 mm;

[0074] preheating the wafer blank to 420 ° C; preheating the forging die to 250 after 20 minutes of forging operation

[0075] after the hot forging is completed, the disc-shaped blank is placed in water and rapidly cooled;

[0076] The water-cooled forged aluminum alloy wheel blank is heated to 200 ° C, placed on a powerful spinning machine, and spun into a hollow rotating body hub blank; then the hollow rotating body hub blank is placed in an annealing furnace and heated to 150 °C, heat preservation for 2h; Finally, the hub blank is machined and subsequently surface treated to obtain automotive aluminum alloy wheel products.

[0077] The aluminum alloy hubs obtained in the first embodiment, the second embodiment, and the third embodiment are selected to perform corresponding mechanical performance tests, and respectively, sampling is performed on different parts of the hub, and the rim and the spoke portion are subjected to a round bar tensile degree sample. D6x30 _{; the} rim part is made of sheet tensile specimen, the width Μ0 is selected, the thickness is the original thickness of the rim, and the tensile test is carried out according to the GB/T228-2002 test standard. Table 1 is the embodiment 1, the embodiment 2, the embodiment 3 The test results of the aluminum alloy wheel obtained by the preparation method are as shown in Table 1.

[XXXX

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

The invention relates to a method for manufacturing an Al-Mg alloy wheel hub, which comprises the following steps: First step, preparing materials;

The raw material Al-Mg alloy hot rolled sheet is made into a round sheet blank;

The second step, preheating;

Preheating the wafer blank by heating to 350 ° C to 500 ° C;

The third step, hot forging;

The preheated wafer-shaped blank is placed in a forging die and hot forged into a disk-shaped blank by a forging press;

The fourth step, spinning;

Using a powerful spinning machine, the disc-shaped blank is strongly spun 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 spinning is kept at a temperature of 100 ° C to 250 ° C. 0.5

~4 hours, to achieve low temperature stabilization treatment;

The sixth step, machining and surface treatment;

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

The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein the Al-Mg alloy hot-rolled sheet in the first step is formed by hot-rolling an Al-Mg alloy ingot; The hot rolling treatment method is as follows: the rolling temperature is 440 ° C to 500 ° C, and the finishing rolling temperature is 300 ° C to 350 ° C.

The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein the Al-Mg alloy in the first step is a 5-series aluminum alloy.

The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein the Al-Mg alloy in the first step is 5052, 5754, 5182, 5083, 5A03, 5 A04, 5A05, 5A06 aluminum alloy. .

The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein The thickness of the Al-Mg alloy hot rolled sheet in the first step is 50 mm to 150 mm.

[Claim 6] The method for manufacturing an Al-Mg alloy hub according to claim 1, wherein the preheated turns in the second step are determined according to the thickness of the disk-shaped blank, and are 1 Min/mm~3min/mm.

[Claim 7] The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein the final forging temperature of the hot forging in the third step is lower than 350 °C.

[Claim 8] The method of manufacturing an Al-Mg alloy hub according to claim 1, wherein the number of forgings in the third step is 1 to 2 times.

[Claim 9] The method for manufacturing an Al-Mg alloy hub according to claim 1, wherein after the third step of hot forging, the disk-shaped blank is cooled first, and then at 250 ° C or lower. Strong spinning.

[Claim 10] The method of manufacturing an Al-Mg alloy hub according to claim 9, wherein the cooling is performed by strong air cooling, spray cooling, or quench water cooling.