WO2015188546A1

WO2015188546A1 - Method for manufacturing aluminium alloy wheel hub

Info

Publication number: WO2015188546A1
Application number: PCT/CN2014/088477
Authority: WO
Inventors: 李书通; 王新春; 朱其柱; 丁荣辉; 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: CN104015007A

Abstract

A method for manufacturing an aluminium alloy wheel hub, comprising the following steps: step 1, preparing the material; form a round blank from aluminium alloy hot-rolled plate; step 2, drawing; using a spin-casting machine or a punch-pressing machine, draw the round blank into a disc-shaped blank; step 3, extruding; using a forging press, implement extruding of the centre part of the spokes of the disc-shaped blank, such that the material of the centre part flows to the spokes, flange, and rim parts; step 4, punching holes and cutting the edges; punch holes in the extruded blank and cut the edges thereof; step 5, spin-casting; put the blank having undergone hole punching and edge cutting in a spin-casting machine and spin-cast at a high strength to form a hollow rotating body wheel hub blank; step 6, heat-processing; implement stabilising processing or solid solution ageing processing on the spin-cast hollow rotating body wheel hub blank; and step 7, machining and surface processing; implement machining and surface processing on the heat processed aluminium alloy wheel hub blank to obtain an aluminium wheel hub product. The present method simplifies the manufacturing steps.

Description

Method for manufacturing aluminum alloy wheel hub

[0001] The present invention relates to a method of manufacturing a hub, and more particularly to a method of manufacturing an aluminum 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, which are subjected to processes such as upsetting, initial forging, precision forging, punching, etc., having complicated processes, long production cycle, and material utilization. Low cost, high energy consumption and other shortcomings.

technical problem

[0004] The technical problem to be solved by the present invention is to provide a method for manufacturing an aluminum alloy wheel hub, which can solve the problems of complicated technology, low material utilization rate, low production efficiency and high energy consumption in the prior art, and achieves energy consumption reduction. Improve 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 an aluminum alloy wheel hub of the present invention includes the following steps:

[0006] The first step, preparing materials;

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

[0008] The aluminum alloy hot-rolled sheet is made by hot-rolling an aluminum alloy ingot; the hot rolling treatment method is: the rolling temperature is 440 ° C ~ 500 ° C, and the finishing rolling temperature is 300 ° C ~ 350 °C.

[0009] The aluminum alloy is a 5-series aluminum alloy, a 6-series aluminum alloy, or a 7-series aluminum alloy. The 5-series aluminum alloy is a high-magnesium aluminum alloy Gold 5182, 5083, 5A05, 5A06; the 6 series aluminum alloy is 6061, 6082, 6013 aluminum alloy; the 7 series aluminum alloy is 7A04, 7B04, 7075, 7050, 7055, 7033 aluminum alloy.

[0010] The aluminum alloy hot-rolled sheet has a thickness of 30 mm to 80 mm.

[0011] the second step, drawing deep;

[0012] using a spinning machine or a punching machine, the disk-shaped blank is drawn into a disk-shaped blank;

[0013] the third step, extrusion;

[0014] using a forging press to press the center portion of the spoke of the disc-shaped blank to cause the material of the central portion to flow to the spokes, the rim and the rim portion;

[0015] The number of extrusions is 1 to 2 times.

[0016] The extrusion may be hot extrusion, warm extrusion or cold extrusion.

[0017] The fourth step, punching, trimming;

[0018] punching and trimming the extruded blank;

[0019] the fifth step, spinning;

[0020] The punched, trimmed blank is placed in a spinning machine and strongly spun into a hollow rotating body hub blank; [0021] The spinning may be hot spinning, warm spinning or cold spinning.

[0022] the sixth step, heat treatment;

[0023] Stabilizing or solid solution heat treatment of the hollow rotating body hub blank after spin forming; [0024] when the raw material is a 5-series aluminum alloy, the stabilization treatment is used; when the raw material is a 6-series aluminum alloy or 7 The aluminum alloy is treated by solid solution heat treatment.

[0025] The stabilization treatment method is: the hollow rotating body hub blank is kept in a continuous annealing furnace at 100 ° C ~ 250 ° C for 0.5 ~ 6 hours; the solid solution heat treatment method is: The hollow rotating body hub blank is heated to 440 ° C ~ 580 ° C in a solution furnace, and after quenching for 1 to 4 hours, it is quenched; then it is placed in a furnace to heat it to 120 ° C to 220 ° C, and keep warm 2~ 8 hours.

[0026] seventh step, machining and surface treatment;

[0027] Machining and surface treatment of the aluminum alloy wheel blank after heat treatment to obtain a finished aluminum alloy wheel

Advantageous effects of the invention

Beneficial effect [0028] The technical effects that can be achieved by the present invention are:

[0029] 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 upsetting is required before the spin forming, Forging pre-formed disc-shaped blanks to achieve the effect of improving production efficiency and reducing energy consumption; By squeezing the center portion of the spokes of the disc-shaped blank, the utilization of materials is greatly improved.

[0030] The aluminum alloy hot-rolled thick plate selected by the invention is formed by hot rolling of the 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 microstructure of the alloy. More importantly, by improving the use of hot-rolled aluminum alloy thick plates as raw materials, there is no need to upset and forge pre-formed disc-shaped blanks during the processing, and the obtained product performance can at least achieve the equivalent performance of the original products, simplifying the process. At the same time, the performance of the product can still be guaranteed to be even higher.

[0031] Compared with the prior art for manufacturing an aluminum wheel hub by using a cast rod, the invention improves the raw material and the preparation process used for the aluminum alloy wheel hub, and the billet has a low preheating temperature, and is not pre-formed into a disc shape by upsetting or forging. The process of blanking greatly simplifies the process steps to achieve the goal of reducing energy consumption and increasing production efficiency.

[0032] The present invention can reduce the amount of subsequent blanking by greatly squeezing the center portion of the spoke, so that the material flows to the spokes, the rim and the rim, and greatly improves the utilization rate of the material.

Brief description of the drawing

DRAWINGS

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0034] FIGS. 1a and 1b are schematic views of a wafer-shaped blank prepared by the method for manufacturing an aluminum alloy 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; [0036] FIGS. 3a and 3b are schematic views of a squeeze hub blank prepared by the present invention; Figure 3a is a cross-sectional view of Figure 3b;

4a and 4b are schematic views of a hub blank prepared by the present invention; wherein FIG. 4a is a cross-sectional view of FIG. 4b; [0038] FIGS. 5a and 5b are schematic views of a hollow rotating body hub blank prepared by the present invention; ; Figure 5a is Figure 5b Sectional view;

[0039] FIG. 6a is a schematic view showing a state in which a disk-shaped blank is subjected to spin-drawing using a spinning machine;

[0040] FIG. 6b is a schematic view of a spinning machine for spinning a disk-shaped blank into a disk-shaped blank;

[0041] FIG. 7a is a schematic view of the wafer blank before being punched and drawn by a punching machine;

[0042] FIG. 7b is a schematic view of drawing a sheet-like blank into a disc-shaped blank by using a punching machine;

[0043] FIG. 8a is a schematic view of a disk blank before being pressed by a forging press;

[0044] FIG. 8b is a schematic view of extruding a disc-shaped blank into a squeeze hub blank by using a forging press;

[0045] FIG. 9a is a schematic view of the punching hub blank prior to punching and trimming;

[0046] FIG. 9b is a schematic view of punching and trimming the extruded hub blank;

[0047] FIG. 10a is a schematic view of the billet before being strongly spun by a spinning machine;

[0048] FIG. 10b is a schematic view of a spinning machine for strongly spinning a blank into a hollow rotating body hub blank.

Embodiments of the invention

[0049] The method for manufacturing an aluminum alloy wheel hub of the present invention comprises the following steps:

[0050] the first step, preparing the material;

[0051] calculating the volume of the required blank according to the size of the hub, and forming the aluminum alloy hot-rolled sheet into a disk-shaped blank as shown in FIG.

[0052] The aluminum alloy hot-rolled sheet is made by hot-rolling an aluminum alloy ingot; the hot rolling treatment method is: the rolling temperature is 440 ° C to 500 ° C, and the finishing rolling temperature is 300 ° C to 350 ° C .

[0053] The aluminum alloy may be a 5-series aluminum alloy, a 6-series aluminum alloy or a 7-series aluminum alloy;

[0054] The 5-series aluminum alloy is preferably a high-magnesium aluminum alloy such as 5182, 5083, 5A05, 5A06;

[0055] The 6-series aluminum alloy is preferably an aluminum alloy such as 6061, 6082, 6013;

[0056] The 7-series aluminum alloy is preferably an aluminum alloy such as 7A04, 7B04, 7075, 7050, 7055, 7033;

The thickness of the aluminum alloy hot rolled sheet is preferably 30 mm to 80 mm in accordance with the size of the hub.

[0058] The second step, drawing deep;

[0059] As shown in FIG. 6a, FIG. 6b, FIG. 7a, and FIG. 7b, using a spinning machine or a punching machine, the wafer-shaped blank is drawn deep as shown in the figure.

2a, the disc-shaped blank shown in Figure 2b;

[0060] The third step, extrusion; [0061] As shown in FIG. 8a and FIG. 8b, the center portion of the spoke of the disc-shaped blank is pressed by a forging press, so that the material of the center portion flows to the spokes, the rim and the rim portion, as shown in FIG. 3a and FIG. 3b. Squeeze the hub blank; the number of extrusions is 1 to 2 times;

[0062] The extrusion may be hot extrusion, warm extrusion or cold extrusion;

[0063] The present invention can save raw materials by squeezing the central portion of the aluminum alloy to the rim portion by extrusion.

[0064] The fourth step, punching, trimming;

[0065] As shown in FIG. 9a and FIG. 9b, the extruded blank is punched and trimmed to obtain a blank as shown in FIG. 4a and FIG. 4b;

[0066] The fifth step, spinning;

[0067] As shown in FIG. 10a and FIG. 10b, the punched and trimmed blanks are placed in a powerful spinning machine and strongly pressed into a figure.

5a, the hollow rotating body hub blank shown in Figure 5b;

[0068] The spinning may be hot spinning, warm spinning or cold spinning.

[0069] the sixth step, heat treatment;

[0070] Stabilizing treatment or solid solution heat treatment of the hollow rotating body hub blank after spin forming; 5 series aluminum alloy is stabilized; 6 series aluminum alloy and 7 series aluminum alloy are treated by solid solution heat treatment;

[0071] The stabilization treatment method is: the hollow rotating body hub blank is kept in a continuous annealing furnace at 100 ° C ~ 250 ° C for 0.5 ~ 6h;

[0072] The method of solid solution heat treatment is: heating the hollow rotating body hub blank to 440 ° C ~ 5 in a solid solution furnace

80 ° C, insulation 11! After ~4h, quenching treatment; then put into the effect furnace to heat to 120 ° C ~ 220 ° C, heat preservation 2 ~ 8h;

[0073] The seventh step, machining and surface treatment;

[0074] Machining and surface treatment of the aluminum alloy wheel blank after heat treatment to obtain a finished aluminum alloy wheel

[0075] The machining and surface treatment methods are: edge removal, sanding, polishing and painting.

Embodiment 1

[0077] Take a 22.5 inch automobile aluminum alloy wheel as an example:

[0078] Calculating the volume of the required blank according to the size of the hub, punching a 6061 aluminum alloy hot-rolled thick plate having a thickness of 30 mm into a disk-shaped blank having a size of OSOOmm; drawing the round blank on the spinning machine Spinning into a disk The billet is then tempered to 380 ° C, and the center portion of the spoke blank is hot extruded on the forging press to cause the central portion of the material to flow to the spokes, rims and rims; The upper part is 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 after quenching for 2.5 h, quenching is performed, and after quenching, the aluminum wheel hub is placed in a furnace to be heated to 166 ° C, heat preservation 6h; After heat treatment, the hub is machined and subsequently surface treated to obtain the finished automobile aluminum alloy wheel.

Example 2

[0080] Take a 22.5 inch automobile aluminum alloy wheel as an example:

[0081] A 5A06 aluminum alloy hot-rolled thick plate having a thickness of 30 mm is punched out into a disk-shaped blank having a size of D800 mm; the disk-shaped blank is drawn deep on a spinning machine into a disk-shaped blank; then the disk is shaped The billet is kept at 380 ° C, and the center portion of the spokes of the disc-shaped billet is hot-extruded on the forging press, so that the material of the center portion flows to the spokes, the rim and the rim; and then the core is strongly spun into a hollow on the spinning machine. Rotating body hub blank; then the hollow rotating body hub blank is kept in a continuous annealing furnace at 200 ° C for 2 h for stabilization treatment; finally, the hub is machined and subsequently surface treated to obtain a finished automobile aluminum alloy wheel.

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 of manufacturing an aluminum alloy hub, comprising the steps of:

The first step, preparing the material; forming the aluminum alloy hot rolled sheet into a round sheet blank;

The second step, deepening;

Using a spinning machine or a punching machine, the disc-shaped blank is drawn into a disc-shaped blank; the third step is extrusion;

Using a forging press, the center portion of the spokes of the disc-shaped blank is extruded, so that the material of the central portion flows to the spokes, the rim and the rim portion;

The fourth step, punching and trimming;

Punching and trimming the extruded blank;

The fifth step, spinning;

The punched and trimmed blanks are placed in a spinning machine and strongly spun into a hollow rotating body hub blank;

The sixth step, heat treatment;

Stabilizing or solid solution heat treatment of the hollow rotating body hub blank after spin forming;

The seventh step, machining and surface treatment;

The aluminum alloy wheel blank after heat treatment is machined and surface treated to obtain an aluminum alloy wheel finished product.

[Claim 2] The method for manufacturing an aluminum alloy hub according to claim 1, wherein the aluminum alloy hot-rolled sheet in the first step is formed by hot-rolling an aluminum alloy ingot; The method is as follows: the rolling temperature is 440 ° C ~ 500 ° C, and the finishing rolling temperature is 300 ° C ~ 350. C.

The method of manufacturing an aluminum alloy hub according to claim 1, wherein the aluminum alloy in the first step is a 5-series aluminum alloy, a 6-series aluminum alloy, or a 7-series aluminum alloy.

[Claim 4] The method of manufacturing an aluminum alloy hub according to claim 3, wherein

The 5 series aluminum alloy is a high magnesium aluminum alloy 5182, 5083, 5A05, 5A06; the 6 series aluminum alloy Gold is 6061, 6082, 6013 aluminum alloy; the 7 series aluminum alloy is 7A04, 7B04, 7

075, 7050, 7055, 7033 aluminum alloy.

[Claim 5] The method of manufacturing an aluminum alloy hub according to claim 1, wherein the aluminum alloy hot-rolled sheet in the first step has a thickness of 30 mm to 80 mm.

[Claim 6] The method of manufacturing an aluminum alloy hub according to claim 1, wherein the number of times of pressing in the third step is 1 to 2 times.

[Claim 7] The method of manufacturing an aluminum alloy hub according to claim 1, wherein the pressing in the third step is hot extrusion, warm extrusion or cold extrusion.

[Claim 8] The method of manufacturing an aluminum alloy hub according to claim 1, wherein the spinning in the fifth step is hot spinning, warm spinning or cold spinning.

[Claim 9] The method for manufacturing an aluminum alloy hub according to claim 1, wherein the heat treatment method in the sixth step is: when the raw material is a 5-series aluminum alloy, the stabilization treatment is performed; The 6-series aluminum alloy or the 7-series aluminum alloy is treated by solid solution heat treatment.

[Claim 10] The method for manufacturing an aluminum alloy hub according to claim 1, wherein the method of stabilizing the sixth step is: placing the hollow rotating body hub blank at 100 ° C to 250 ° The continuous annealing furnace of C is kept for 0.5~6 hours; the method of solid solution heat treatment is: heating the hollow rotating body hub blank to 440 ° C ~ 580 ° C in a solution furnace, keeping the temperature 1 to 4 small After quenching, it is quenched; then it is placed in a furnace to heat it to 120 °C ~ 220 °C, and it is kept for 2~8 hours.