WO2015131522A1

WO2015131522A1 - Aluminum alloy hub manufacturing method

Info

Publication number: WO2015131522A1
Application number: PCT/CN2014/088496
Authority: WO
Inventors: 李书通; 王新春; 朱其柱; 茅海波; 张超; 丁荣辉
Original assignee: 浙江巨科实业股份有限公司
Priority date: 2014-03-05
Filing date: 2014-10-13
Publication date: 2015-09-11
Also published as: CN103817495B; CN103817495A

Abstract

An aluminum alloy hub manufacturing method, comprising the following steps: 1) material preparation; 2) preheating; 3) forging; 4) spinning; 5) stabilizing; and 6) machining and surface treatment. The aluminum alloy hub manufacturing method can decrease time for preheating blanks and eliminate the heat treatment processing of solid solution and aging, and provides a high rate of finished products and stable mechanical property, as well as significantly decreases energy consumption and improves production efficiency. The manufactured aluminum alloy hub has better mechanical property and higher tensile strength, yield strength and elongation rate, thus meeting various performance requirements of a hub.

Description

Aluminum alloy wheel manufacturing method

Technical field

[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] The existing forged aluminum alloy wheel hub is usually made of Al-Mg-Si alloy. After the hub is formed, it needs to be strengthened by the solid solution and the effect of the long crucible, and has the advantages of long production cycle and high energy consumption. .

technical problem

The technical problem to be solved by the present invention is to provide a method for manufacturing an aluminum alloy wheel hub, which can 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 method for manufacturing an aluminum alloy wheel hub of the present invention includes the following steps:

[0006] The first step, preparing materials;

[0007] The raw material Al-Mg alloy hot rolled thick plate is made into a round cake-like blank;

[0008] The Al-Mg alloy hot rolled thick plate is formed by hot rolling treatment of an Al-Mg alloy ingot.

[0009] The chemical composition of the Al-Mg alloy ingot includes: ^ό.Ο^ ό.δ^, MnO O^ OJS^

, . ^^ (^^ ~ (! ^) ^, Be0.001 <¾~0.005 <¾, Ti0.04~0.08 <¾, Si <0.3%

, Fe ≤ 0.4%, the balance of Al and unavoidable impurities.

[0010] The hot rolling treatment method is: the rolling temperature is 460 ° C ~ 470 ° C, the finishing temperature is 250 ° C ~ 350 ° C [0011] The Al-Mg alloy hot rolled thick plate has a thickness of 30 mm to 155 mm.

[0012] the second step, preheating;

[0013] The round cake-like material is heated to 420 ° C ~ 460 ° C for pre-heat treatment;

[0014] The preheated crucible is determined according to the thickness of the round cake blank, and is lmin/mm to 2 min/mm.

[0015] the third step, forging;

[0016] The preheated round cake-like blank is placed in a mold, and forged by a forging press to obtain a forged aluminum alloy wheel blank;

[0017] Before forging, the mold is preheated to 350 ° C to 450 ° C in advance.

[0018] The number of forgings is 1 to 2 times.

[0019] the fourth step, spinning;

[0020] The forged aluminum alloy hub blank is preheated to 300 ° C ~ 400 ° C into a spinning machine, at 300 ° C ~ 400 ° C temperature spin forming;

[0021] The fifth step, the stabilization process;

[0022] The aluminum alloy hub blank after spinning is kept at a temperature of 150 ° C to 300 ° C for 0.5 to 6 hours to achieve low temperature stabilization treatment;

[0023] The sixth step, machining and surface treatment;

[0024] The aluminum alloy hub blank after the stabilization treatment is machined and surface-treated to obtain an aluminum alloy wheel finished product.

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

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, adopts the Al-Mg alloy hot-rolled thick plate as the raw material, does not use the Al-Mg-Si alloy as the raw material, and does not need to pass through the solid solution between the long turns and the effect. The heat treatment process greatly simplifies the process steps, thereby achieving the purpose of reducing energy consumption and improving production efficiency.

[0028] 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 cast rod-shaped blank, not only the required preheating of the blank is required. Daytime The invention is short and the subsequent upsetting process is omitted, so that the invention can not only significantly reduce the energy consumption, but also can simplify the process and improve the production efficiency.

[0029] The invention not only has high product yield, but also has stable mechanical properties, good mechanical properties, high tensile strength, yield strength and elongation, and can fully achieve the performance of the hub. Claim.

Embodiments of the invention

[0030] The method for manufacturing the aluminum alloy wheel hub of the present invention uses the Al-Mg alloy hot rolled thick plate as a raw material, and includes the following steps:

[0031] the first step, preparing materials;

[0032] calculating the volume of the required blank according to the size of the aluminum alloy hub; punching the Al-Mg alloy hot-rolled thick plate into a round cake-like blank;

[0033] The Al-Mg alloy hot-rolled thick plate is made by hot-rolling an Al-Mg alloy ingot; the specific hot rolling treatment method is: hot rolling treatment of the Al-Mg alloy ingot, rolling temperature 460 ° C ~ 470 ° C, the finishing temperature is 250 ° C ~ 350 ° C;

[0034] The present invention performs hot rolling treatment of an Al-Mg alloy ingot at a recrystallization temperature or higher, which can improve the structure of the alloy and improve the properties of the alloy.

[0035] The chemical composition of the Al-Mg alloy ingot includes: ^ό.Ο^ ό.δ^, MnO O^ OJS^

, . ^^ (^^ ~ (! ^) ^, Be0.001 <¾~0.005 <¾, Ti0.04~0.08 <¾, Si <0.3%

, Fe <0.4%, the balance of Al and inevitable impurities.

[0036] 6.0% to 6.8<3⁄4 of Mg in the Al-Mg alloy used in the present invention, which can ensure the strength of the aluminum hub

Among them, Mn and Cr can form dispersed particles such as Al ₆ Mn, Al ₇ Cr, and Al ₁₂ (CrMn) with Al, which can hinder the nucleation and growth of recrystallization, refine the recrystallized grains, and improve the strength of the alloy. It also dissolves iron impurities and reduces the harmful effects of excess iron.

[0037] The thickness of the Al-Mg alloy hot rolled thick plate is preferably 30 mm to 155 mm in accordance with the requirements of the size of the hub.

[0038] the second step, preheating;

[0039] The round cake-like billet is heated to 420 ° C ~ 460 ° C for pre-heat treatment; [0040] The preheated crucible is determined according to the thickness of the round cake blank, lmin / mm ~ 2min / mm;

[0041] the third step, forging;

[0042] The preheated round cake-like blank is placed in a mold, and forged by a forging press to obtain a forged aluminum alloy wheel blank;

[0043] Before forging, the mold is preheated to 350 ° C ~ 450 ° C;

[0044] The number of forging operations is 1 to 2 times;

[0045] The invention adopts a hot-rolled thick 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 crucible also reduces the number of forgings correspondingly, thereby greatly simplifying the production process. Increased production efficiency.

[0046] the fourth step, spinning;

[0047] The forged aluminum alloy wheel blank is preheated to 300 ° C ~ 400 ° C into a spinning machine, and is spin-formed at a temperature of 300 ° C ~ 400 ° C;

[0048] The fifth step, the stabilization process;

[0049] The aluminum alloy hub blank after spinning is kept at a temperature of 150 ° C to 300 ° C for 0.5 to 6 hours to achieve low temperature stabilization treatment;

[0050] the sixth step, machining and surface treatment;

[0051] machining and surface treatment of the aluminum alloy hub blank after the stabilization treatment to obtain an aluminum alloy wheel finished product;

[0052] The machining and surface treatment methods are: edge removal, sanding, polishing and painting.

Example

[0053] Take a 17-inch automobile aluminum alloy wheel as an example:

[0054] The chemical composition is Mg 6.4%, Mn 0.65% ^ Cr 0.05 < 3⁄4, Be0.002 < 3⁄4, Ti 0.06 < 3⁄4, SiO. 12%, FeO. 21%. Not less than 92.5% of Al ( The Al-Mg alloy hot-rolled sheet of the remaining inevitable impurities is punched into a round cake-like blank having a size of Φ350χ65ηιηι;

[0055] preheating the round cake-like material to 450 ° C; before forging work, preheating the mold to 430 ° C for 20 minutes, separating the upper mold and the lower mold, spraying lubricant on the working surface of the mold, The high-temperature preheated round cake blank is placed in a mold and extruded by a forging press to form a forged blank to initially form the hub;

[0056] heating the forged blank to 350 ° C, spinning the forging blank into a hollow rotating body hub on a spinning machine; The spinning blank was kept in a continuous annealing furnace at 200 ° C for 2 h; finally, the hub was machined and subsequently surface treated to obtain an automobile aluminum alloy wheel product.

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

claims

[Claim 1] A method of manufacturing aluminum alloy wheels, characterized in that it includes the following steps:

The first step is to prepare materials;

The raw material Al-Mg alloy hot-rolled thick plate is made into a round cake-shaped blank; the second step is preheating;

Heat the round cake-shaped blank to 420°C~460°C for preheating;

The third step is forging;

Put the preheated round cake-shaped blank into the mold and forge it with a forging press to obtain a forged aluminum alloy wheel hub blank;

The fourth step is spinning;

Preheat the forged aluminum alloy wheel hub blank to 300°C~400°C and put it into a spinning machine, and perform spin forming at a temperature of 300°C~400°C;

The fifth step is stabilization;

The aluminum alloy wheel hub blank after spinning is kept at a temperature of 150°C to 300°C for 0.5 to 6 hours to achieve low-temperature stabilization;

Step six, machining and surface treatment;

The stabilized aluminum alloy wheel hub blank is machined and surface treated to obtain a finished aluminum alloy wheel hub.

[Claim 2] The manufacturing method of aluminum alloy wheel hub according to claim 1, characterized in that, the Al-Mg alloy hot-rolled thick plate in the first step is made by hot-rolling Al-Mg alloy ingot. become.

[Claim 3] The manufacturing method of aluminum alloy wheel hub according to claim 2, characterized in that:

The chemical composition of Al-Mg alloy ingots includes: ^ό.ο^ ό.δ^

, Μn0.50 ^< ¾~0.75 ^< ¾, ^^. (^^~(!^)^, Be0.001 ^< ¾~0.005 ^< ¾, Ti0.04~0.08%», Si<0.3%, Fe≤0.4<¾, the balance of Al and inevitable impurities.

[Claim 4] The manufacturing method of aluminum alloy wheel hub according to claim 2, characterized in that the hot rolling treatment method is: the joint rolling temperature is 460°C~470°C, and the final rolling temperature is 250° C ~350. C.

[Claim 5] The manufacturing method of aluminum alloy wheel hub according to claim 1, characterized in that the thickness of the Al-Mg alloy hot-rolled thick plate in the first step is 30mm~155mm.

[Claim 6] The manufacturing method of aluminum alloy wheel hub according to claim 1, characterized in that the time of the preheating treatment in the second step is determined according to the thickness of the round cake-shaped blank, which is lmin/mm ~2min/mm.

[Claim 7] The manufacturing method of aluminum alloy wheel hub according to claim 1, characterized in that, before forging in the third step, the mold is preheated to 350°C~450°C.

[Claim 8] The manufacturing method of aluminum alloy wheel hub according to claim 1, characterized in that the number of forging presses in the third step is 1 to 2 times.

[Claim 9] The manufacturing method of aluminum alloy wheels according to claim 1, characterized in that the machining and surface treatment methods in the sixth step are: edge removal, grinding, polishing and painting