CN105671463A - Tetrapod-shaped zinc oxide whisker reinforced aluminum alloy hub and preparing method thereof - Google Patents
Tetrapod-shaped zinc oxide whisker reinforced aluminum alloy hub and preparing method thereof Download PDFInfo
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- CN105671463A CN105671463A CN201610073555.8A CN201610073555A CN105671463A CN 105671463 A CN105671463 A CN 105671463A CN 201610073555 A CN201610073555 A CN 201610073555A CN 105671463 A CN105671463 A CN 105671463A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
- C22C49/04—Light metals
- C22C49/06—Aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/14—Making alloys containing metallic or non-metallic fibres or filaments by powder metallurgy, i.e. by processing mixtures of metal powder and fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
- B22F2003/185—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers by hot rolling, below sintering temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses a tetrapod-shaped zinc oxide whisker reinforced aluminum alloy hub and preparing method thereof. The aluminum alloy hub is made of compositions including, by weight percent, 8% to 14% of tetrapod-shaped zinc oxide whiskers, 12% to 16% of silicon, 1.0% to 1.5% of strontium, 0.12% to 0.18% of tantalum, 2.0% to 2.8% of magnesium, 1.8% to 2.4% of manganese, 0.40% to 0.56% of chromium and the balance aluminum. The preparing method comprises the steps of burdening, smelting, atomizing and obtaining aluminum alloy powder; performing ball mill mixing, performing cold isostatic pressing, demolding, performing sleeving coating treatment, performing warming pressure maintaining treatment and obtaining a blank; heating, rolling, forging, and spinning forming to obtain a hub workblank; and performing heat treatment, machining and surface treatment, and obtaining a hub finished product. After-casting treatment temperature is reasonably controlled, and the alloy is uniform in crystallization, high in strength, resistant in corrosion and impact, good in heat resistance, free of bubbles and good in casing and forging performance.
Description
Technical field
The present invention relates to aluminium alloy accessory technical field, specifically a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub and preparation method thereof.
Background technology
Wheel hub is one of vitals of running car system, is a kind of require higher auto parts machinery, and it has very big relation with the driving performance of vehicle, the comfortableness taken and safety.
At present, the wheel hub on market can be divided into steel wheel hub and alloy wheel hub according to material, and each have their own pros and cons. The main hungry advantage of steel wheel hub is exactly that manufacturing process is simple, advantage of lower cost, and anti-metal fatigue capability is very strong. But the shortcoming of steel wheel hub is also relatively prominent, it is simply that outward appearance is ugly, weight is big, and inertia resistance is big, and thermal diffusivity is also poor, and is very easy to get rusty. Alloy material wheel hub just can make up such problem, lighter weight, and inertia resistance is little, making precision is high, and the degeneration when high-speed rotation is little, and inertia resistance is little, being conducive to improving the linear driving performance of automobile, alleviating tire drag, thus reducing oil consumption. The heat conductivility of alloy material is about three times of steel matter, and thermal diffusivity is good, and the heat fade for the braking system of vehicle, tire and brakes can play a role.
Aluminium alloy is because having the advantages such as lightweight, energy-saving and cost-reducing, price is low, surface quality is high, thermal diffusivity is good, be prone to molding, damping property is good, and is widely used in making automotive hub. Fast development along with auto industry, the performance requirement of aluminium alloy wheel hub is also improved constantly therewith, existing aluminium alloy wheel hub there is also some problems, such as insufficient strength, heavier-weight, poor processability, poor radiation, Metamorphism treatment limited efficiency, the problems such as casting quality is unstable, accordingly, it would be desirable to improve the combination property of wheel hub aluminium alloy further.
Summary of the invention
It is an object of the invention to provide a kind of light weight, intensity four acicular type zinc oxide crystal whisker high, good casting property strengthens aluminium alloy wheel hub and preparation method thereof.
For achieving the above object, the present invention provides following technical scheme:
A kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 8～14%, silicon 12～16%, strontium 1.0～1.5%, tantalum 0.12～0.18%, magnesium 2.0～2.8%, manganese 1.8～2.4%, chromium 0.40～0.56% and surplus.
As the further scheme of the present invention: according to weight percent meter, be made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 10～12%, silicon 13～15%, strontium 1.2～1.4%, tantalum 0.15～0.17%, magnesium 2.4～2.6%, manganese 1.9～2.2%, chromium 0.42～0.48% and surplus.
As the further scheme of the present invention: according to weight percent meter, be made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 11%, silicon 14%, strontium 1.3%, tantalum 0.16%, magnesium 2.5%, manganese 2.1%, chromium 0.45% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, comprises the following steps:
(1) according to above-mentioned percentage by weight, weighing each component raw material, each component raw material is pure ingot or alloy material;
(2) aluminium ingot is put into fusing in the fusing stove of 680～700 DEG C, carry out removing impurities matter, deoxidation, employing refining agent initial refining, then fusing stove is warming up to 750～770 DEG C, each alloy material is put into fusing in fusing stove again, and add refining agent double refining, after each alloy material all melts, deaerated process obtains aluminum alloy melt;
(3) importing in sprayer unit by aluminum alloy melt, carry out gas atomization by atomizer, atomization gas is nitrogen, and gas pressure is 1.4～1.5MPa, obtains Al alloy powder;
(4) proceeding in ball mill by the Al alloy powder that atomization obtains, add four acicular type zinc oxide crystal whisker and carry out ball mill mixing, material ball ratio is 1:6～8, and rotating speed is 250～300r/min, and mixing time is 2～3h, obtains mixed-powder;
(5) under the pressure of 450～480MPa, mixed-powder isostatic cool pressing is become blank, process with fine aluminium suitcase set after the demoulding, then with the ramp of 1.5～2 DEG C/min to 110～120 DEG C, be incubated 30min, then with the ramp of 1.2～1.5 DEG C/min to 280～300 DEG C, insulation 1h, then with the ramp of 1 DEG C/min to 510～520 DEG C, is incubated 6～8h, last pressurize 2.5～3h under the pressure of 410～420MPa, obtains blank;
(6) by blank heating to 358～375 DEG C, being incubated 3～3.5h, be then rolled into the hot rolled plate that thickness is 60～78mm, start rolling temperature is 380～398 DEG C, and finishing temperature is 355～365 DEG C;
(7) hot rolled plate is made round pie blank, be then preheated to 390～400 DEG C, forge and press with forging press, the wheel hub blank that forging and stamping obtain is preheated to 358～365 DEG C, then carries out shear spinning shaping with spinning machine;
(8) wheel hub blank after spinning is carried out heat treatment: first by room temperature with the ramp of 3～3.5 DEG C/min to 280～300 DEG C, insulation 25～28min, again with the ramp of 3～3.5 DEG C/min to 470～480 DEG C, insulation 25～28min, again with the ramp of 2.5～3.5 DEG C/min to 542～548 DEG C, it is incubated 4～4.5h; Room temperature shrend, after naturally cooling to room temperature, then with the ramp of 1.5～2.5 DEG C/min to 120～140 DEG C, is incubated 2.5～3h, takes out air cooling to room temperature;
(9) wheel hub blank after heat treatment is machined out and surface treatment, obtains wheel hub finished product.
Compared with prior art, the invention has the beneficial effects as follows:
Instant component is scientific and reasonable, and formula is simple, it is easy to implements, casts post-processing temperature by conservative control so that alloy crystallization is uniform, intensity is high, corrosion-resistant, shock-resistant, heat-resist, bubble-free, and casting and forgeability are good.The room temperature tensile intensity of the aluminium alloy wheel hub that the inventive method prepares is 394～409MPa, and the tensile strength under 320 DEG C of conditions is 290～298MPa, and yield strength is 318～326MPa, and Brinell hardness is 92～110, and elongation percentage is 14.0～14.8%.
This aluminium alloy is applicable to make high-grade car wheel hub, and after forged, smooth surface, outward appearance is beautiful, and quality is light, and intensity is high, and safety coefficient is high. Preparation technology of the present invention is simple to operation, and energy consumption is low, and production efficiency is high, is suitable for large-scale production.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1
In the embodiment of the present invention, a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 8%, silicon 16%, strontium 1.0%, tantalum 0.18%, magnesium 2.0%, manganese 2.4%, chromium 0.40% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, comprises the following steps:
(1) according to above-mentioned percentage by weight, weighing each component raw material, each component raw material is pure ingot or alloy material;
(2) aluminium ingot is put into fusing in the fusing stove of 6890 DEG C, carry out removing impurities matter, deoxidation, employing refining agent initial refining, then fusing stove is warming up to 760 DEG C, each alloy material is put into fusing in fusing stove again, and add refining agent double refining, after each alloy material all melts, deaerated process obtains aluminum alloy melt;
(3) importing in sprayer unit by aluminum alloy melt, carry out gas atomization by atomizer, atomization gas is nitrogen, and gas pressure is 1.5MPa, obtains Al alloy powder;
(4) proceeding in ball mill by the Al alloy powder that atomization obtains, add four acicular type zinc oxide crystal whisker and carry out ball mill mixing, material ball ratio is 1:7, and rotating speed is 300r/min, and mixing time is 3h, obtains mixed-powder;
(5) under the pressure of 470MPa, mixed-powder isostatic cool pressing is become blank, process with fine aluminium suitcase set after the demoulding, then with the ramp of 2 DEG C/min to 120 DEG C, be incubated 30min, then with the ramp of 1.5 DEG C/min to 300 DEG C, insulation 1h, then with the ramp of 1 DEG C/min to 520 DEG C, is incubated 8h, last pressurize 3h under the pressure of 420MPa, obtains blank;
(6) by blank heating to 370 DEG C, being incubated 3.5h, be then rolled into the hot rolled plate that thickness is 74mm, start rolling temperature is 388 DEG C, and finishing temperature is 360 DEG C;
(7) hot rolled plate is made round pie blank, be then preheated to 400 DEG C, forge and press with forging press, the wheel hub blank that forging and stamping obtain is preheated to 362 DEG C, then carries out shear spinning shaping with spinning machine;
(8) wheel hub blank after spinning is carried out heat treatment: first by room temperature with the ramp of 3.5 DEG C/min to 300 DEG C, insulation 28min, then with the ramp of 3.5 DEG C/min to 480 DEG C, it is incubated 28min, again with the ramp of 3.5 DEG C/min to 548 DEG C, it is incubated 4.5h; Room temperature shrend, after naturally cooling to room temperature, then with the ramp of 2.5 DEG C/min to 140 DEG C, is incubated 3h, takes out air cooling to room temperature;
(9) wheel hub blank after heat treatment is machined out and surface treatment, obtains wheel hub finished product.
Embodiment 2
In the embodiment of the present invention, a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 14%, silicon 12%, strontium 1.5%, tantalum 0.12%, magnesium 2.8%, manganese 1.8%, chromium 0.56% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub is identical with embodiment 1.
Embodiment 3
In the embodiment of the present invention, a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 10%, silicon 15%, strontium 1.2%, tantalum 0.17%, magnesium 2.4%, manganese 2.2%, chromium 0.42% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub is identical with embodiment 1.
Embodiment 4
In the embodiment of the present invention, a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 12%, silicon 13%, strontium 1.4%, tantalum 0.15%, magnesium 2.6%, manganese 1.9%, chromium 0.48% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub is identical with embodiment 1.
Embodiment 5
In the embodiment of the present invention, a kind of four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 11%, silicon 14%, strontium 1.3%, tantalum 0.16%, magnesium 2.5%, manganese 2.1%, chromium 0.45% and surplus.
The preparation method that described four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub is identical with embodiment 1.
The performance of the aluminium alloy wheel hub that each embodiment of table 1 prepares
Tested by the aluminium alloy wheel hub finished product that the various embodiments described above are prepared, test result is as shown in table 1: the room temperature tensile intensity of aluminium alloy wheel hub is 394～409MPa, tensile strength under 320 DEG C of conditions is 290～298MPa, yield strength is 318～326MPa, Brinell hardness is 92～110, and elongation percentage is 14.0～14.8%. This aluminium alloy is applicable to make high-grade car wheel hub, and after forged, smooth surface, outward appearance is beautiful, and quality is light, and intensity is high, and safety coefficient is high.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (4)
1. a four acicular type zinc oxide crystal whisker strengthens aluminium alloy wheel hub, it is characterized in that, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 8～14%, silicon 12～16%, strontium 1.0～1.5%, tantalum 0.12～0.18%, magnesium 2.0～2.8%, manganese 1.8～2.4%, chromium 0.40～0.56% and surplus.
2. four acicular type zinc oxide crystal whisker according to claim 1 strengthens aluminium alloy wheel hub, it is characterized in that, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 10～12%, silicon 13～15%, strontium 1.2～1.4%, tantalum 0.15～0.17%, magnesium 2.4～2.6%, manganese 1.9～2.2%, chromium 0.42～0.48% and surplus.
3. four acicular type zinc oxide crystal whisker according to claim 1 strengthens aluminium alloy wheel hub, it is characterized in that, according to weight percent meter, it is made up of following components: the aluminum of four acicular type zinc oxide crystal whisker 11%, silicon 14%, strontium 1.3%, tantalum 0.16%, magnesium 2.5%, manganese 2.1%, chromium 0.45% and surplus.
4. one kind as arbitrary in claims 1 to 3 as described in four acicular type zinc oxide crystal whisker strengthen aluminium alloy wheel hub preparation method, it is characterised in that comprise the following steps:
(1) according to above-mentioned percentage by weight, weighing each component raw material, each component raw material is pure ingot or alloy material;
(2) aluminium ingot is put into fusing in the fusing stove of 680～700 DEG C, carry out removing impurities matter, deoxidation, employing refining agent initial refining, then fusing stove is warming up to 750～770 DEG C, each alloy material is put into fusing in fusing stove again, and add refining agent double refining, after each alloy material all melts, deaerated process obtains aluminum alloy melt;
(3) importing in sprayer unit by aluminum alloy melt, carry out gas atomization by atomizer, atomization gas is nitrogen, and gas pressure is 1.4～1.5MPa, obtains Al alloy powder;
(4) proceeding in ball mill by the Al alloy powder that atomization obtains, add four acicular type zinc oxide crystal whisker and carry out ball mill mixing, material ball ratio is 1:6～8, and rotating speed is 250～300r/min, and mixing time is 2～3h, obtains mixed-powder;
(5) under the pressure of 450～480MPa, mixed-powder isostatic cool pressing is become blank, process with fine aluminium suitcase set after the demoulding, then with the ramp of 1.5～2 DEG C/min to 110～120 DEG C, be incubated 30min, then with the ramp of 1.2～1.5 DEG C/min to 280～300 DEG C, insulation 1h, then with the ramp of 1 DEG C/min to 510～520 DEG C, is incubated 6～8h, last pressurize 2.5～3h under the pressure of 410～420MPa, obtains blank;
(6) by blank heating to 358～375 DEG C, being incubated 3～3.5h, be then rolled into the hot rolled plate that thickness is 60～78mm, start rolling temperature is 380～398 DEG C, and finishing temperature is 355～365 DEG C;
(7) hot rolled plate is made round pie blank, be then preheated to 390～400 DEG C, forge and press with forging press, the wheel hub blank that forging and stamping obtain is preheated to 358～365 DEG C, then carries out shear spinning shaping with spinning machine;
(8) wheel hub blank after spinning is carried out heat treatment: first by room temperature with the ramp of 3～3.5 DEG C/min to 280～300 DEG C, insulation 25～28min, again with the ramp of 3～3.5 DEG C/min to 470～480 DEG C, insulation 25～28min, again with the ramp of 2.5～3.5 DEG C/min to 542～548 DEG C, it is incubated 4～4.5h; Room temperature shrend, after naturally cooling to room temperature, then with the ramp of 1.5～2.5 DEG C/min to 120～140 DEG C, is incubated 2.5～3h, takes out air cooling to room temperature;
(9) wheel hub blank after heat treatment is machined out and surface treatment, obtains wheel hub finished product.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106048313A (en) * | 2016-06-29 | 2016-10-26 | 无锡康柏斯机械科技有限公司 | Aluminum alloy material used for hub and casting method |
| CN109177649A (en) * | 2018-09-04 | 2019-01-11 | 江苏东方龙机车集团有限公司 | High-strength vehicle wheel hub and its processing method |
| CN113215427A (en) * | 2021-03-24 | 2021-08-06 | 山东创新金属科技有限公司 | Production process of aluminum alloy for forging and pressing wheel hub |
| CN113649578A (en) * | 2019-10-23 | 2021-11-16 | 璞奔(常州)新材料科技有限公司 | Hub manufacturing system and hub carrier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048313A (en) * | 2016-06-29 | 2016-10-26 | 无锡康柏斯机械科技有限公司 | Aluminum alloy material used for hub and casting method |
| CN109177649A (en) * | 2018-09-04 | 2019-01-11 | 江苏东方龙机车集团有限公司 | High-strength vehicle wheel hub and its processing method |
| CN113649578A (en) * | 2019-10-23 | 2021-11-16 | 璞奔(常州)新材料科技有限公司 | Hub manufacturing system and hub carrier |
| CN113215427A (en) * | 2021-03-24 | 2021-08-06 | 山东创新金属科技有限公司 | Production process of aluminum alloy for forging and pressing wheel hub |
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