CN109454214A - A kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray - Google Patents
A kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray Download PDFInfo
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- CN109454214A CN109454214A CN201811383365.1A CN201811383365A CN109454214A CN 109454214 A CN109454214 A CN 109454214A CN 201811383365 A CN201811383365 A CN 201811383365A CN 109454214 A CN109454214 A CN 109454214A
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- China
- Prior art keywords
- baking tray
- die casting
- thermal conductivity
- aluminium alloy
- high thermal
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Classifications
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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
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/06—Roasters; Grills; Sandwich grills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- 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)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Cookers (AREA)
Abstract
The present invention relates to a kind of methods of ultrasonic wave die casting preparation high thermal conductivity baking tray, including melting in smelting furnace is added in aluminium alloy cast ingot, and control smelting temperature is 740-760 DEG C；Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, 0.5-1h is kept the temperature, obtains molten aluminium alloy；Aluminum alloy melt is refined, degasification, slagging-off；Ultrasonic variable amplitude bar is inserted through in the aluminum alloy melt after slagging-off, die casting liquid, supersonic frequency 40-50kHz, ultrasonic power 1000-2000W are obtained after being ultrasonically treated to the aluminum alloy melt of melting, ultrasonic time is 30-60 seconds；Die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；After the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained.The baking tray production method prepared by means of the present invention is simple, good heat conduction effect, is suitble to promote the use of in baking field.
Description
Technical field
The present invention relates to the production field of baking tray more particularly to a kind of methods of ultrasonic wave die casting preparation high thermal conductivity baking tray.
Background technique
Oven becomes household electrical appliance indispensable in family now, and the roasted food product taste of oven is aromatic palatable.It is roasting
There are many materials for the baking tray of case, and relatively conventional has stainless steel baking tray, aluminum baking tray, glass roasting plate, other alloy baking trays etc.
Deng, wherein the heat-conducting effect of steel baking tray is worst, and cause easy uneven heating in baking process even, and the baking tray of aluminium alloy becomes
Optimal selection.In the manufacturing field of aluminium alloy, die casting is current most important casting technique, high production efficiency, material
Utilization rate is high, is suitble to large-scale industrial production.In order to guarantee mobile performance when die casting, it will usually be added about in aluminium alloy
10% silicon, such as the aluminium alloy of the domestic code name YL113 in China, usually contain 9.5-11.5% silicon, since the lattice of the alloy is sent out
Raw distortion generates biggish resistance to the movement of free electron, to also cause the heating conduction of this aluminium alloy not high, generally
Thermal coefficient only has the left and right 100W/ (mK).
Therefore, the baking tray for manufacturing high thermal conductivity seems especially urgent for baking field.Have in the prior art and leads to
It crosses and changes the report that silicon mutually changes thermal conductivity, composite inoculating is occurred by the boron of addition 0.02% and 0.03% strontium, handles aluminium
Silicon alloy, Si phase are changed into threadiness by lamellar, make annealing treatment within four hours through 350 DEG C, so that the thermal coefficient of alloy improves
To about 179W/ (mK), but the above research is only using aluminium alloy ENAB-44200 as raw material, when using aluminium alloy ADC10,
When ADC11 or ADC12, since the copper content between the latter is significantly larger than ENAB-44200, die casting is obtained in the above conditions
Finished product is easy to happen the precipitation of copper.
Therefore, it is necessary to research and develop a kind of easy to make, preparation method of the high aluminium alloy baking tray of heat transfer efficiency.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, provide a kind of easy to make, thermal conductivity height, suitable conventional aluminum alloys
ADC10, ADC11 or ADC12 carry out the preparation method of die casting baking tray.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows: a kind of ultrasonic wave die casting preparation high thermal conductivity baking tray
Method, comprising:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt is refined, degasification, slagging-off；
E. ultrasonic variable amplitude bar is inserted through in the aluminum alloy melt after slagging-off, the aluminum alloy melt of melting is ultrasonically treated
After obtain die casting liquid, supersonic frequency 40-50kHz, ultrasonic power 1000-2000W, ultrasonic time are 30-60 seconds, ultrasonic
Keeping heating temperature in the process is 740-760 DEG C；
F. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
G. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained；
Wherein, the additional amount of Sr element accounts for the 0.03-0.05wt% of total alloy additional amount, and B element additional amount accounts for total alloy additional amount
0.03-0.05 wt%, the aluminium alloy cast ingot be selected from one of ADC10 aluminium alloy, ADC11 aluminium alloy, ADC12 aluminium alloy
Or it is a variety of, the pressure in the press casting procedure is 200-250MPa, and the dwell time is 5-10 seconds.
It is believed that can be had an impact when melt undercooling to the size of the nuclei of crystallization, leads to and Clausius-Clapeyron equation is analyzed
It is found that the temperature of crystallization is also higher when the pressure rise to as cast condition melt, the size of corresponding nucleus is also smaller.Copper adds
The intensity and hardness for entering may make aluminium alloy increase, and ADC10, ADC11 or ADC12 alloy higher for copper content comes
It says, copper is easier to be precipitated and lead to the inhomogenous of aluminium phase, can also have a negative impact to thermal coefficient.
Furthermore supersonic oscillations casting, which prepares high strength alumin ium alloy also, relevant report, and report is pointed out, in the molten of aluminium alloy
Supersonic oscillations processing is added in body, may make aluminium alloy during solidification, crystal grain can be refined, can effectively improve
Institutional framework and mechanical performance, cardinal principle are that ultrasonic vibration can generate cavitation bubble in liquid metal, and cavitation bubble closure can be with
Local assault wave is generated, the particle in molten metal is smashed, so that crystal grain refinement, homogeneously crystallized.
Therefore, it uses higher pressure cooperation with the ultrasonic treatment before die casting, can theoretically realize that nucleus minimizes, because
This, can solve the problems, such as to cast face out-of-flatness and heat transfer efficiency reduction caused by the precipitation of copper.
In a preferred embodiment of the present invention, Cu element accounts for the 1.5-5wt% of total alloy, preferably 2-4wt%.
The thermal coefficient for the aluminium alloy high thermal conductivity baking tray that the method is prepared through the invention is greater than 180W/ (m
K)。
In a preferred embodiment of the present invention, the coating is selected from polytetrafluorethylecoatings coatings or medical stone applies
Layer.Polytetrafluorethylecoatings coatings are relatively conventional non-sticky coatings, are applied in baking tray extensively.Medical stone coating is newest stream
Capable coating, both the above coating can avoid food and directly contact with aluminium alloy ontology, and use is safer.
In a preferred embodiment of the present invention, in the step f, baking tray mold is heated and is kept the temperature in 150-170
Die casting is carried out after DEG C again.
Another goal of the invention of the invention is, provides a kind of baking tray with high thermal conductivity effect.The baking tray passes through
Above method prepares.Preferably, baking tray is with a thickness of 1-2mm.
The invention solves the defect existing in the background technology, and beneficial effects of the present invention are as follows:
1, the aluminium alloy baking tray thermal conductivity with higher of preparation method die casting of the invention, when bakery product heat transfer uniformly, no
It is easy to cause cooked-on burned, the oven use of satisfaction baking new hand, temperature control effect difference.
2, high pressure die casting has been selected to cooperate ultrasonic wave pre-treatment in pressure casting method of the invention, so that high for copper content
Aluminium alloy also can guarantee that casting is smooth, bubble-free while guaranteeing high thermal conductivity coefficient.The introducing of ultrasonic wave can reduce
The pressure of used high pressure, and then reduce the requirement to die casting instrument.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the Metallographic Analysis figure of the sample of embodiment number 4；
Fig. 2 is the Metallographic Analysis figure of the sample of embodiment number 5.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment
In the preferred embodiment of the present invention, the method for ultrasonic wave die casting preparation high thermal conductivity baking tray, comprising:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt is refined, degasification, slagging-off；
E. ultrasonic variable amplitude bar is inserted through in the aluminum alloy melt after slagging-off, the aluminum alloy melt of melting is ultrasonically treated
After obtain die casting liquid, it is 740-760 DEG C that heating temperature is kept in ultrasonic process；
F. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
G. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained.
Aluminium ingot raw material used and process conditions are as shown in table 1 below.
Table 1
Number 1-3, No. 5 samples use ultrasonic treatment, and for No. 4 samples of number not using ultrasonic treatment, remaining condition is identical.
Test is sampled to above-mentioned numbered samples before coating, test comparison at sample center is intercepted, using C-
THERM TCI heat conduction coefficient tester measures.
The results are shown in Table 2 for Determination of conductive coefficients.
Table 2
| Number | 1 | 2 | 3 | 4 | 5 |
| Thermal coefficient W/ (mK) | 135.5 | 123.7 | 182.1 | 154.9 | 190.8 |
By result as can be seen that be apparently higher than using the thermal coefficient for the product for carrying out die casting acquisition after ultrasonication again
Without the thermal coefficient of the product of the number 3,5 in the die-cast product of ultrasonic treatment, such as table 2 reach 180 W/ (mK) with
On.
Metallographic Analysis result is as shown in Figs. 1-2.The sample polishing grinding for being 4 and 5 by number, with the hydrofluoric acid of 0.5% concentration
Corrosion, the tissue visualization texture under metallographic microscope.Specifically, as shown in Figure 1, being the micro-organization chart of sample 4, such as Fig. 2 institute
Show, is the micro-organization chart of sample 5.
By the result in figure it is found that the alloy structure in Fig. 1 is uneven, 100-200 μm of copper crystalline substance, knot are locally produced
Structure nonuniform organization.Institutional framework in Fig. 2 is compared to Fig. 1, and tree-shaped crystallization is more obvious, uniformly, and copper crystalline substance significantly reduces,
This transformation is so that the thermal coefficient of aluminium alloy increases significantly.
The high thermal conductivity baking tray being prepared by means of the present invention has excellent thermal conductivity and tensile strength, high-copper
The heat resistanceheat resistant excellent performance of the aluminium alloy of content at high temperature, can be applied in the baking tray of high quality, and production method is simple, be suitble to big rule
Mould production.
Based on the above description of the preferred embodiments of the present invention, through the above description, related personnel completely can be with
Without departing from the scope of the technological thought of the present invention', various changes and amendments are carried out.The technical scope of this invention
It is not limited to the contents of the specification, it is necessary to determine the technical scope according to the scope of the claims.
Claims (7)
1. a kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray, it is characterised in that: include:
A. melting in smelting furnace is added in aluminium alloy cast ingot, control smelting temperature is 740-760 DEG C；
B. Al-5B alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h；
C. Al-10Sr alloy is added in smelting furnace, controlled at 740-760 DEG C, keeps the temperature 0.5-1h, it is molten obtains aluminium alloy
Liquid；
D. aluminum alloy melt is refined, degasification, slagging-off；
E. ultrasonic variable amplitude bar is inserted through in the aluminum alloy melt after slagging-off, the aluminum alloy melt of melting is ultrasonically treated
After obtain die casting liquid, supersonic frequency 40-50kHz, ultrasonic power 1000-2000W, ultrasonic time are 30-60 seconds, ultrasonic
Keeping heating temperature in the process is 740-760 DEG C；
F. die casting liquid is transferred to high-pressure and hydraulic die casting machine, aluminium alloy baking tray blank is gone out by baking tray die casting；
G. after the polishing of aluminium alloy baking tray blank, coating is carried out, high thermal conductivity baking tray finished product is obtained；
Wherein, the additional amount of Sr element accounts for the 0.03-0.05wt% of total alloy additional amount, and B element additional amount accounts for total alloy additional amount
0.03-0.05 wt%, the aluminium alloy cast ingot be selected from one of ADC10 aluminium alloy, ADC11 aluminium alloy, ADC12 aluminium alloy
Or it is a variety of, the pressure in the press casting procedure is 200-250MPa, and the dwell time is 5-10 seconds.
2. a kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray according to claim 1, it is characterised in that: Cu element
Account for the 1.5-5wt% of total alloy, preferably 2-4wt%.
3. a kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray according to claim 1, it is characterised in that: the height
The thermal coefficient of thermally conductive baking tray is greater than 180W/ (mK).
4. a kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray according to claim 1, it is characterised in that: the painting
Layer choosing is from polytetrafluorethylecoatings coatings or medical stone coating.
5. a kind of method of ultrasonic wave die casting preparation high thermal conductivity baking tray according to claim 1, it is characterised in that: the step
In rapid f, baking tray mold is heated and kept the temperature carries out die casting again after 150-170 DEG C.
6. high thermal conductivity baking tray made from the preparation method of any one of -5 high thermal conductivity baking trays according to claim 1.
7. high thermal conductivity baking tray according to claim 6, it is characterised in that: baking tray is with a thickness of 1-2mm.
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| CN201811383365.1A CN109454214B (en) | 2018-11-20 | 2018-11-20 | Method for preparing high-heat-conductivity baking tray through ultrasonic die casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111636008A (en) * | 2020-05-22 | 2020-09-08 | 广州致远新材料科技有限公司 | Ultrasonic treatment method suitable for aluminum-silicon alloy melt |
| CN114532847A (en) * | 2022-01-28 | 2022-05-27 | 浙江康都日用品有限公司 | Coffee pot base and processing method thereof |
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|---|---|---|---|---|
| CN111636008A (en) * | 2020-05-22 | 2020-09-08 | 广州致远新材料科技有限公司 | Ultrasonic treatment method suitable for aluminum-silicon alloy melt |
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| CN114532847A (en) * | 2022-01-28 | 2022-05-27 | 浙江康都日用品有限公司 | Coffee pot base and processing method thereof |
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