CN105671371A - Manufacturing technique for alloy mold - Google Patents
Manufacturing technique for alloy mold Download PDFInfo
- Publication number
- CN105671371A CN105671371A CN201510971721.1A CN201510971721A CN105671371A CN 105671371 A CN105671371 A CN 105671371A CN 201510971721 A CN201510971721 A CN 201510971721A CN 105671371 A CN105671371 A CN 105671371A
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- alloy
- manufacturing process
- mould
- mold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a manufacturing technique for an alloy mold. The manufacturing technique is characterized by comprising the following steps that firstly, raw materials are weighed and proportioned according to the weight ratio, then the proportioned raw materials are added into a smelting furnace, molten alloy aluminum is transferred into a maintaining furnace to be refined and degassed after being completely melted, then die casting production and preheat treatment are conducted, cooling and injection are conducted, and finally, formation, preheat treatment and heat preservation are conducted. By the adoption of the manufacturing technique, the chromium content of the mold materials is increased, the electrode potential of iron in mold steel can be improved by increasing the content of chromium, and accordingly the corrosion resistance is improved. Meanwhile, the molten alloy aluminum is poured into a manufacturing mold cavity through a double-layer pouring gate in a lateral pouring mode, and thus stable mold filling and a good feeding effect are achieved; produced conductor castings meet the technological requirements for air impermeability and electrical conductivity at the same time; and the mold cavity can be filled with the molten alloy aluminum within 0.01-0.2 second, and the high-quality castings which are good in appearance quality and inherent quality can be produced stably, rhythmically and efficiently.
Description
Technical field
The present invention relates to the technical field of Making mold, specifically the manufacturing process of a kind of alloy mold, particularly for the manufacturing process of the aluminum alloy mould of auto parts and components.
Background technology
Aluminium alloy is a kind of light alloy material, owing to material has the ability of higher intensity and atmospheric corrosion resistance, becoming the preferred material of many components of machine, the density of fine aluminium is little (ρ=2.7g/cm3), it is about the 1/3 of ferrum, fusing point low (660 DEG C), aluminum is face-centred cubic structure, therefore has significantly high plasticity (δ: 32 ~ 40%, ψ: 70 ~ 90%), being prone to processing, can be made into various section bar, sheet material, corrosion resistance is good; But the intensity of fine aluminium is very low, annealed condition σ b value is about 8kgf/mm2, therefore should not make structural material. By long-term production practices and scientific experiments, people are gradually to add alloying element and to use the methods such as heat treatment to carry out reinforced aluminum, and this just obtains a series of aluminium alloy. The alloy adding the formation of certain element can also have higher intensity while keeping the advantages such as fine aluminium light weight, and σ b value is respectively up to 24～60kgf/mm2. Its " specific strength " (the ratio σ b/ ρ of intensity and proportion) is so made to surpass a lot of steel alloy, become desirable structural material, it is widely used in the aspects such as machine-building, Transport Machinery, dynamic power machine and aircraft industry, the fuselage of aircraft, eyelid covering, compressor etc. are often with aluminium alloy manufacture, to alleviate deadweight. Adopting aluminium alloy to replace the welding of steel plate materials, construction weight can alleviate more than 50%.
Aluminium alloy density is low, but strength ratio is higher, and near or above high-quality steel, plasticity is good, can be processed into various section bar, has excellent electric conductivity, heat conductivity and a corrosion stability, industrial widely uses, and makes consumption be only second to steel. Some aluminium alloys can adopt heat treatment to obtain good mechanical performance, physical property and corrosion resistance. 2008 Beijing Olympic Games torch lucky cloud is exactly that aluminium alloy makes.
But, in the production process of die casting, cause because mould damages (fracture, abrasion, be full of cracks, burn into plastic deformation etc.) production to pause and product qualification rate declines increasingly severe, cause the waste of a large amount of man power and material. Therefore, the service life of alloy mold is low, has become as the main cause that Die Casting cost is under not.
Existing alloy mold is in use primarily present following defect:
1, poor heat stability, it is easy to occur plastic deformation to lose effectiveness.
2, corrosion resistance is poor, and the mold cavity surface of mould and liquid metal and ingot stripper and air easily chemical reaction occur but the material on mold cavity surface occurs to dissolve or magazine penetrates into, and causes that mold surface roughness reduces, causes goods degree of accuracy to decline.
3, wearing no resistance, easily there is fretting wear and abrasive wear in die surface, causes the size of product to change or overproof.
4, thermal fatigue is poor, and mould in use needs repeatedly to be heated and cool down, and mould can produce heat exhaustion under alternating temperature-changing effect and form be full of cracks, thus causing article surface coarse.
5, heat conductivity is undesirable, when liquid alloy injects mold working surface, mold temperature increases rapidly, sometimes when this temperature is higher than mould temperature, mould is easily made to produce plastic deformation and lose efficacy, mould temperature difference when heating and cooling is big simultaneously, and the internal stress of generation is relatively big, and heat exhaustion be full of cracks easily occurs.
Summary of the invention
It is an object of the invention to provide the manufacturing process of the alloy mold of a kind of improvement, it can overcome mold hot poor stability in prior art, and corrosion resistance is poor, wears no resistance, and thermal fatigue difference and heat conductivity are undesirable, the some shortcomings that die life is short.
To achieve these goals, the technical scheme is that the manufacturing process of a kind of alloy mold, it is characterised in that: manufacturing process comprises the steps:
A, according to weight ratio, raw material being carried out weighing and burden, the percentage by weight of each raw material is: AL:70～80%, Cr:5～10%, Si:4～6%, Cu:1～2%, Fe:4～10%, Mn:0.2～0.35%, Zn:0.35～0.68%, Mg:0.02～0.33%, Ni:0.02～0.28%, Sn:0.1～0.13%, Ti:0.1～0.13%, Pb:0.1～0.18%, the percentage by weight sum of above-mentioned each composition is 100%;
B, melting: the raw material prepared is added in smelting furnace, the temperature of smelting furnace controls at 930～960 DEG C, after being completely melt, temperature is down to 710～760 DEG C, after static 5-10min, alloy aluminum liquid proceeds to holding furnace and carries out refine degasification, and during refine degasification, temperature controls at 690～730 DEG C, alloy aluminum liquid after making is extracted detection piece, after detection piece cooling, carries out mechanical performance detection;
C, Die Casting: alloy aluminum liquid is poured in die casting machine and is pressed, alloy aluminum liquid temp controls at 640～680 DEG C, alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel, makes die cavity and is preheated to 180～220 DEG C, and alloy aluminum liquid is after injection, then the pre-heat treatment, cooling, injection, last molding, the pre-heat treatment, is incubated Tmin;
The touring inspection of mould after D, molding, arranges material handle and punching;
E, strengthening Technology for Heating Processing;
F, inspection of blank, deburring, dumpling hole, ball blast, inspection warehouse-in.
During use, invention increases the chromium content in mold materials, increase the content of chromium, it is possible to improve the electrode potential of ferrum in mould steel, improve corrosion resistance. Alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel simultaneously, achieve Stable Filling and good feeding effect, the conductor foundry goods produced meets the process requirements of air-tightness and electric conductivity simultaneously, the filling time of alloy aluminum liquid is 0.01 0.2 seconds, die cavity can be filled up, can stably produce rhythmically and efficiently outward appearance, inherent quality good, size coincidence pattern or agreement specify the castings that requires, even premium casting. For improving combination property and the service life of mould, mould is carried out strengthening heat treatment, for strengthening the wear-resisting, corrosion-resistant of aluminum alloy mould surface and high temperature impact resistance performance further, after Die Casting completes, make its Surface Creation ceramic layer on aluminum alloy mould surface by pulse differential arc oxidization technique. Above-mentioned process is adopted to finally give the aluminum alloy mould with post-curing effect, and the actual work temperature of temperature and mould is close, tempering rear mold surface still has good hardness, mould finally shows stronger antioxidation, anticorrosive, high temperature resistant and thermal fatigue property, makes the mold use life-span significantly improve.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
The manufacturing process of a kind of alloy mold of the present invention comprises the steps:
Dispensing: raw material is carried out weighing and burden according to weight ratio, the percentage by weight of each raw material is: AL:70～80%, Cr:4～10%, Si:4～6%, Cu:1～2%, Fe:4～10%, Mn:0.2～0.35%, Zn:0.35～0.68%, Mg:0.02～0.33%, Ni:0.02～0.28%, Sn:0.1～0.13%, Ti:0.1～0.13%, Pb:0.1～0.18%, the percentage by weight sum of above-mentioned each composition is 100%;
Melting: the raw material prepared is added in smelting furnace, the temperature of smelting furnace controls at 930～960 DEG C, after being completely melt, temperature is down to 710～760 DEG C, after static 5-10min, alloy aluminum liquid proceeds to holding furnace and carries out refine degasification, and during refine degasification, temperature controls at 690～730 DEG C, alloy aluminum liquid after making is extracted detection piece, after detection piece cooling, carries out mechanical performance detection;
Die Casting: alloy aluminum liquid is poured in die casting machine and is pressed, alloy aluminum liquid temp controls at 640～680 DEG C, alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel, achieve Stable Filling and good feeding effect, the conductor foundry goods produced meets the process requirements of air-tightness and electric conductivity simultaneously, the filling time of alloy aluminum liquid is 0.01 0.2 seconds, die cavity can be filled up, stably can produce outward appearance rhythmically and efficiently, inherent quality is good, size coincidence pattern or agreement specify the castings required, even premium casting. make die cavity be preheated to 180～220 DEG C, alloy aluminum liquid through injection after, then the pre-heat treatment, cooling, injection, last molding, the pre-heat treatment, be incubated Tmin,
The touring inspection of mould after molding, arranges material handle and punching;
Strengthening Technology for Heating Processing;
Inspection of blank, deburring, dumpling hole, ball blast, inspection warehouse-in.
In refine degasification, adopting nitrogen to be filled with in stove, the degasification time is 5～8 minutes, during the detection of detection piece mechanical performance, and tensile strength >=240Mpa, elongation percentage rate≤1, yield strength >=140Mpa, hardness HRC >=80;
In step C, during the pre-heat treatment, mould heats to 500～550 DEG C, is incubated Tmin, and then mold temperature is down to 300～350 DEG C, is incubated 2～4 hours, and temperature retention time T is calculated as follows: T=D*1.3min/1mm, and the D in formula is the maximum gauge size of alloy mold; Cool time is 10-12min, and shot time is 7-10min, and the pre-heat treatment can make hardness HRC >=80 of mould, promotes the tensile strength of mould. In D step, before arranging material handle, mould being carried out test of flaw detection, surface tension is tested and tensile test, by tension intensity > 27KN.
For improving combination property and the service life of mould; mould is carried out strengthening heat treatment; mould is warming up to 350～400 DEG C; it is incubated 0.3-0.6 hour; then in protective atmosphere, point 1-2 temperature-gradient method, to 700～850 DEG C, 0.5～1 hour, is cooled to 150 DEG C after oil quenching; being warming up to 450～500 DEG C again, tempering is incubated 0.5～1.5 hour.
For improving complex-shaped large scale die casting comprehensive mechanical performance and hot property further; in described strengthening Technology for Heating Processing; in protective atmosphere, point 2 temperature-gradient methods are to 700～850 DEG C; first it is warming up to 450～500 DEG C; it is incubated 0.5 hour; it is warming up to 600～650 DEG C again, is incubated 1～2 hour, is finally warming up to 700～850 DEG C.
Causing hardness to reduce for preventing decarburization in die surface heat treatment again, described heat preservation method adopts protective atmosphere heating or adopts charcoal powder protection heating.
The mould adopting above-mentioned Technology for Heating Processing finally gives the aluminum alloy mould with post-curing effect, and the actual work temperature of temperature and mould is close, tempering rear mold surface still has good hardness, mould finally shows stronger antioxidation, anticorrosive, high temperature resistant and thermal fatigue property, makes the mold use life-span significantly improve.
For strengthening the wear-resisting, corrosion-resistant of aluminum alloy mould surface and high temperature impact resistance performance further, after Die Casting completes, making its Surface Creation ceramic layer on aluminum alloy mould surface by pulse differential arc oxidization technique, the electrolyte aqueous solution of employing is by the NaSiO of the NaOH that percentage by weight is 3～5%, 20～30%3, 5～10% (NaPO3)6, 1% the dodecylbenzene sodium sulfonate of KOH and 1～2% make, surplus is water, and above-mentioned percentage by weight sum is 100%.
In pulse differential arc oxidization technique, electric current density is 8A/dm2, the temperature of electrolyte solution is 43～55 DEG C, and oxidization time is 5-10min.
During use, invention increases the chromium content in mold materials, increase the content of chromium, it is possible to improve the electrode potential of ferrum in mould steel, improve corrosion resistance. Alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel simultaneously, achieve Stable Filling and good feeding effect, the conductor foundry goods produced meets the process requirements of air-tightness and electric conductivity simultaneously, the filling time of alloy aluminum liquid is 0.01 0.2 seconds, die cavity can be filled up, can stably produce rhythmically and efficiently outward appearance, inherent quality good, size coincidence pattern or agreement specify the castings that requires, even premium casting. For improving combination property and the service life of mould, mould is carried out strengthening heat treatment, for strengthening the wear-resisting, corrosion-resistant of aluminum alloy mould surface and high temperature impact resistance performance further, after Die Casting completes, make its Surface Creation ceramic layer on aluminum alloy mould surface by pulse differential arc oxidization technique. Above-mentioned process is adopted to finally give the aluminum alloy mould with post-curing effect, and the actual work temperature of temperature and mould is close, tempering rear mold surface still has good hardness, mould finally shows stronger antioxidation, anticorrosive, high temperature resistant and thermal fatigue property, makes the mold use life-span significantly improve.
Claims (9)
1. the manufacturing process of an alloy mold, it is characterised in that: manufacturing process comprises the steps:
A, dispensing: raw material is carried out weighing and burden according to weight ratio, the percentage by weight of each raw material is: AL:70～80%, Cr:5～10%, Si:4～6%, Cu:1～2%, Fe:4～10%, Mn:0.2～0.35%, Zn:0.35～0.68%, Mg:0.02～0.33%, Ni:0.02～0.28%, Sn:0.1～0.13%, Ti:0.1～0.13%, Pb:0.1～0.18%, the percentage by weight sum of above-mentioned each composition is 100%;
B, melting: the raw material prepared is added in smelting furnace, the temperature of smelting furnace controls at 930～960 DEG C, after being completely melt, temperature is down to 710～760 DEG C, after static 5-10min, alloy aluminum liquid proceeds to holding furnace and carries out refine degasification, and during refine degasification, temperature controls at 690～730 DEG C, alloy aluminum liquid after making is extracted detection piece, after detection piece cooling, carries out mechanical performance detection;
C, Die Casting: alloy aluminum liquid is poured in die casting machine and is pressed, alloy aluminum liquid temp controls at 640～680 DEG C, alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel, makes die cavity and is preheated to 180～220 DEG C, and alloy aluminum liquid is after injection, then the pre-heat treatment, cooling, injection, last molding, the pre-heat treatment, is incubated Tmin;
The touring inspection of mould after D, molding, arranges material handle and punching;
E, strengthening Technology for Heating Processing;
F, inspection of blank, deburring, dumpling hole, ball blast, inspection warehouse-in.
2. the manufacturing process of a kind of alloy mold according to claim 1, it is characterised in that: step B, in refine degasification, adopt nitrogen to be filled with in stove, the degasification time is 5～8 minutes;
During the detection of detection piece mechanical performance, tensile strength >=240Mpa, elongation percentage rate≤1, yield strength >=140Mpa, hardness HRC >=80.
3. the manufacturing process of a kind of alloy mold according to claim 1, it is characterized in that: in step C, during the pre-heat treatment, mould heats to 500～550 DEG C, insulation Tmin, then mold temperature is down to 300～350 DEG C, is incubated 2～4 hours, temperature retention time T is calculated as follows: T=D*1.3min/1mm, and the D in formula is the maximum gauge size of alloy mold;
Cool time is 10-12min, and shot time is 7-10min.
4. the manufacturing process of a kind of alloy mold according to claim 1, it is characterised in that: in D step, before arranging material handle, mould being carried out test of flaw detection, surface tension is tested and tensile test, by tension intensity > 27KN.
5. the manufacturing process of a kind of alloy mold according to claim 1; it is characterized in that: in E step; mould is warming up to 350～400 DEG C; it is incubated 0.3-0.6 hour; then divide 1-2 temperature-gradient method to 700～850 DEG C in protective atmosphere; being cooled to 150 DEG C after oil quenching, then be warming up to 450～500 DEG C, tempering is incubated 0.5-1.5 hour.
6. the manufacturing process of a kind of alloy mold according to claim 5, it is characterised in that: protective atmosphere heating or employing charcoal powder protection heating.
7. the manufacturing process of a kind of alloy mold according to claim 1, it is characterized in that: in step C, after Die Casting completes, making its Surface Creation ceramic layer on aluminum alloy mould surface by pulse differential arc oxidization technique, the electrolyte aqueous solution of employing is by the NaSiO of the NaOH that percentage by weight is 3～5%, 20～30%3, 5～10% (NaPO3)6, 1% the dodecylbenzene sodium sulfonate of KOH and 1～2% make, surplus is water, and above-mentioned percentage by weight sum is 100%.
8. the manufacturing process of a kind of alloy mold according to claim 7, it is characterised in that: in pulse differential arc oxidization technique, electric current density is 8A/dm2, the temperature of electrolyte solution is 43～55 DEG C, and oxidization time is 5-10min.
9. the manufacturing process of a kind of alloy mold according to claim 1, it is characterised in that: in step C, alloy aluminum liquid is poured in making die cavity by the side note formula pouring type of double-deck running channel, and the filling time of alloy aluminum liquid is 0.01 0.2 seconds.
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| CN201510971721.1A CN105671371A (en) | 2015-12-22 | 2015-12-22 | Manufacturing technique for alloy mold |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048268A (en) * | 2016-07-01 | 2016-10-26 | 宜兴市凯诚模具有限公司 | Manufacturing method of alloy die |
| CN106334720A (en) * | 2016-09-12 | 2017-01-18 | 东莞市铝美铝型材有限公司 | Die for improving internal textural structure of aluminum alloy stamped profile and manufacturing method |
| CN106626163A (en) * | 2016-11-23 | 2017-05-10 | 江苏雨燕模塑有限公司 | Manufacturing method of auto tire mold |
| CN106756271A (en) * | 2016-12-13 | 2017-05-31 | 安徽省煜灿新型材料科技有限公司 | A kind of strong soleplate of wear-resistant adhesion and preparation method |
| CN106756292A (en) * | 2016-12-13 | 2017-05-31 | 安徽省煜灿新型材料科技有限公司 | A kind of strong ceramic layer aluminum soleplate of adhesion |
| CN106947896A (en) * | 2017-03-21 | 2017-07-14 | 醴陵市湘成陶瓷制造有限公司 | The manufacture craft and its application method of ceramic shaping aluminum alloy mould |
| CN107119213A (en) * | 2017-07-05 | 2017-09-01 | 合肥万之景门窗有限公司 | A kind of aluminium alloy extrusions and its preparation technology |
| CN108115373A (en) * | 2017-12-22 | 2018-06-05 | 苏州永为客模架有限公司 | A kind of processing technology of aluminum alloy support base mould bases |
| CN109988934A (en) * | 2017-12-30 | 2019-07-09 | 宜兴市恒邦环保有限公司 | A kind of water treatment facilities often use the processing technology of bracket |
| CN111101044A (en) * | 2020-01-02 | 2020-05-05 | 西安昆仑工业（集团）有限责任公司 | Forming method of cast aluminum mold |
| CN113776992A (en) * | 2021-08-27 | 2021-12-10 | 河北光兴半导体技术有限公司 | Method for testing surface tension of melt |
| CN115896493A (en) * | 2022-10-24 | 2023-04-04 | 苏州沃泰尔精密模具机械有限公司 | Preparation method of aluminum-copper alloy die composite material |
-
2015
- 2015-12-22 CN CN201510971721.1A patent/CN105671371A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048268A (en) * | 2016-07-01 | 2016-10-26 | 宜兴市凯诚模具有限公司 | Manufacturing method of alloy die |
| CN106334720A (en) * | 2016-09-12 | 2017-01-18 | 东莞市铝美铝型材有限公司 | Die for improving internal textural structure of aluminum alloy stamped profile and manufacturing method |
| CN106626163A (en) * | 2016-11-23 | 2017-05-10 | 江苏雨燕模塑有限公司 | Manufacturing method of auto tire mold |
| CN106756271A (en) * | 2016-12-13 | 2017-05-31 | 安徽省煜灿新型材料科技有限公司 | A kind of strong soleplate of wear-resistant adhesion and preparation method |
| CN106756292A (en) * | 2016-12-13 | 2017-05-31 | 安徽省煜灿新型材料科技有限公司 | A kind of strong ceramic layer aluminum soleplate of adhesion |
| CN106947896A (en) * | 2017-03-21 | 2017-07-14 | 醴陵市湘成陶瓷制造有限公司 | The manufacture craft and its application method of ceramic shaping aluminum alloy mould |
| CN107119213A (en) * | 2017-07-05 | 2017-09-01 | 合肥万之景门窗有限公司 | A kind of aluminium alloy extrusions and its preparation technology |
| CN108115373A (en) * | 2017-12-22 | 2018-06-05 | 苏州永为客模架有限公司 | A kind of processing technology of aluminum alloy support base mould bases |
| CN109988934A (en) * | 2017-12-30 | 2019-07-09 | 宜兴市恒邦环保有限公司 | A kind of water treatment facilities often use the processing technology of bracket |
| CN111101044A (en) * | 2020-01-02 | 2020-05-05 | 西安昆仑工业（集团）有限责任公司 | Forming method of cast aluminum mold |
| CN113776992A (en) * | 2021-08-27 | 2021-12-10 | 河北光兴半导体技术有限公司 | Method for testing surface tension of melt |
| CN113776992B (en) * | 2021-08-27 | 2024-02-23 | 河北光兴半导体技术有限公司 | Method for testing surface tension of melt |
| CN115896493A (en) * | 2022-10-24 | 2023-04-04 | 苏州沃泰尔精密模具机械有限公司 | Preparation method of aluminum-copper alloy die composite material |
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Application publication date: 20160615 |