CN113680993B - Casting process of connecting cross rod of treadmill handle - Google Patents
Casting process of connecting cross rod of treadmill handle Download PDFInfo
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- CN113680993B CN113680993B CN202111085017.8A CN202111085017A CN113680993B CN 113680993 B CN113680993 B CN 113680993B CN 202111085017 A CN202111085017 A CN 202111085017A CN 113680993 B CN113680993 B CN 113680993B
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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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
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- 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
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Abstract
The invention discloses a casting process of a handle connecting cross rod of a running machine, which relates to the technical field of running machine processing and comprises the following steps: the method comprises the following steps of (1) alloy smelting treatment, (2) casting treatment, (3) heat treatment and (4) aging treatment. The invention provides a casting process of a handle connecting cross rod of a treadmill, which can rapidly realize the processing and the manufacturing of the handle connecting cross rod, and the manufactured product has the advantages of good mechanical quality, strong corrosion resistance and rust resistance, stable service performance and the like, and the process method is simpler.
Description
Technical Field
The invention relates to the technical field of treadmill processing, in particular to a casting process of a connecting cross rod of a treadmill handle.
Background
Treadmills are athletic equipment known as running machines. Treadmills provide walking or running exercise effects in a small space using belts that rotate along an endless track, and are therefore widely used in homes or sports centers. Since the treadmill allows a user to perform walking or running exercise at an appropriate temperature indoors even in winter and allows the running speed to be arbitrarily controlled, the demand for the treadmill is increasing.
The treadmill has a structure which is basically similar, comprises handles on two sides and is used for holding and carrying, a cross bar is arranged between the two handles for connection and fixation, the cross bar is beneficial to the stability of the handles, the mechanical quality such as better strength is required, and the treadmill is inevitably contacted with sweat due to body-building use, so that the treadmill also needs to have good corrosion resistance and rust resistance.
In the prior art, the casting method of the cross rod is more traditional, and the mechanical property, corrosion resistance and rust resistance of the processed cross rod are poorer, so that a casting process of the cross rod capable of improving the corrosion resistance and rust resistance is urgently needed to be developed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a casting process of a connecting cross rod of a treadmill handle, and the connecting cross rod processed by the process has good mechanical quality and strong corrosion resistance and rust resistance.
In order to achieve the purpose, the invention provides the following technical scheme:
the casting process of the connecting cross rod of the treadmill handle comprises the following steps:
(1) Alloy smelting treatment:
smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;
(2) Pouring treatment:
carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;
(3) And (3) heat treatment:
carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;
(4) And (3) aging treatment:
after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.
By adopting the technical scheme, the connecting cross rod of the handle can be quickly machined and formed, has good mechanical and chemical properties, and avoids the problems of reprocessing and complex flow.
Further, the alloy in the step (1) comprises the following components in percentage by weight: 8.0 to 9.5 percent of silicon, 0.1 to 0.2 percent of iron, 0.3 to 0.5 percent of magnesium, 0.1 to 0.3 percent of copper, 0.4 to 0.7 percent of manganese, 0.01 to 0.04 percent of titanium, 0.01 to 0.03 percent of boron, 0.1 to 0.4 percent of impurities and the balance of aluminum.
By adopting the technical scheme, the alloy with a proper formula is selected, so that the basic performance and the machinability of the cross rod are ensured, and a foundation is laid for subsequent machining.
Further, the addition amount of the modifier in the step (1) is 0.5-1% of the total mass of the alloy; the temperature of the modifier in the corresponding furnace is 750-760 ℃ when the modifier is added.
By adopting the technical scheme, the used modifier can improve the flow property of the aluminum alloy fluid and the stability after heat treatment, and can promote the refinement of the aluminum alloy grains, improve the uniformity of the grains, and enhance the characteristics of integral wear resistance, corrosion resistance and the like.
Further, the modifier is composed of the following components in parts by weight: 20 to 25 portions of strontium and 10 to 15 portions of
Chromium, 1-3 parts of yttrium and 4-8 parts of silver.
By adopting the technical scheme, the effects are better achieved through strictly compatible element components.
Further, controlling the temperature in the furnace to be 760-770 ℃ during degassing in the step (1); and controlling the tapping temperature to be 725-735 ℃ during tapping.
Further, the casting temperature is controlled to be 700-710 ℃ and the pressure is controlled to be 0.2-0.25 MPa during the casting in the step (2).
Further, the ultrasonic frequency is controlled to be 700-800 kHz during the ultrasonic treatment in the step (2).
By adopting the technical scheme, the ultrasonic wave is utilized to promote the flow of the melt and the elimination of bubbles, the processing speed is accelerated, and the yield of the product is improved.
Further, the heating treatment in the step (3) is specifically to heat the temperature to 500-520 ℃ within 3.5-4 h, and then to perform heat preservation treatment for 5-7 h at the temperature.
Further, the water quenching cooling treatment in the step (3) is specifically that the alloy is put into water quenching liquid and treated for 5-8 min; the water quenching liquid consists of the following components in parts by weight: 3 to 6 parts of nano titanium carbide, 0.3 to 0.5 part of hexadecyl trimethyl ammonium bromide, 1 to 1.5 parts of sodium pyrophosphate, 1 to 2 parts of silane coupling agent and 260 to 300 parts of deionized water.
Through adopting above-mentioned technical scheme to special shrend liquid carries out the shrend, can accelerate shrend speed on the one hand, reduces stress and defective rate, and on the other hand can improve the surface quality characteristic of aluminum alloy again, improves its weatherability and stability.
Further, the artificial aging treatment in the step (4) is heat preservation treatment for 5-6 h at the temperature of 150-160 ℃.
In summary, compared with the prior art, the invention has the following beneficial effects:
the invention provides a casting process of a handle connecting cross rod of a treadmill, which can rapidly realize the processing and the manufacturing of the handle connecting cross rod, and the manufactured product has the advantages of good mechanical quality, strong corrosion resistance and rust resistance, stable service performance and the like, and the process method is simple, easy to popularize and apply and has great market competitiveness.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the casting process of the connecting cross rod of the treadmill handle comprises the following steps:
(1) Alloy smelting treatment:
smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;
(2) Pouring treatment:
carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment in the process, and taking out and cooling for later use after the ultrasonic treatment is finished;
(3) And (3) heat treatment:
heating for heat treatment, then water quenching for cooling, and finally naturally cooling to room temperature for later use;
(4) Aging treatment:
and (5) after natural cooling, carrying out man-hour effect treatment, polishing after the man-hour effect treatment is finished, and inspecting to obtain the finished product.
The alloy in the step (1) comprises the following components in percentage by weight: 8.0 percent of silicon, 0.1 to 0.2 percent of iron, 0.3 percent of magnesium, 0.1 percent of copper, 0.4 percent of manganese, 0.01 percent of titanium, 0.01 percent of boron, 0.1 percent of impurities and the balance of aluminum.
The addition amount of the modifier in the step (1) is 0.5 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 750 ℃ in the furnace.
The modifier consists of the following components in parts by weight: 20 parts of strontium, 10 parts of chromium, 1 part of yttrium and 4 parts of silver.
Controlling the temperature in the furnace to be 760 ℃ during degassing in the step (1); and controlling the tapping temperature to be 725 ℃ during tapping.
And (3) controlling the casting temperature to be 700 ℃ and the pressure to be 0.2MPa during casting in the step (2).
And (3) controlling the ultrasonic frequency to be 700kHz during ultrasonic treatment in the step (2).
The heating treatment in the step (3) is specifically to heat the temperature to 500 ℃ within 3.5h, and then carry out heat preservation treatment for 5h at the temperature.
The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for treatment for 5min; the water quenching liquid consists of the following components in parts by weight: 3 parts of nano titanium carbide, 0.3 part of hexadecyl trimethyl ammonium bromide and 1 part of
Sodium pyrophosphate, 1 part of silane coupling agent and 260 parts of deionized water.
The artificial aging treatment in the step (4) is heat preservation treatment for 5 hours at the temperature of 150-160 ℃.
Example 2:
the casting process of the connecting cross rod of the treadmill handle comprises the following steps:
(1) Alloy smelting treatment:
smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;
(2) Pouring treatment:
carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;
(3) And (3) heat treatment:
heating for heat treatment, then water quenching for cooling, and finally naturally cooling to room temperature for later use;
(4) And (3) aging treatment:
after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.
The alloy in the step (1) comprises the following components in percentage by weight: 9.0% silicon, 0.15% iron, 0.4% magnesium, 0.2% copper, 0.6% manganese, 0.03% titanium, 0.02% boron, 0.3% impurities, and the balance aluminum.
The addition amount of the modifier in the step (1) is 0.8 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 755 ℃ in the furnace.
The modifier consists of the following components in parts by weight: 23 parts of strontium, 12 parts of chromium, 2 parts of yttrium and 6 parts of silver.
Controlling the temperature in the furnace to 765 ℃ during degassing in the step (1); and controlling the tapping temperature to be 730 ℃ during tapping.
And (3) controlling the casting temperature to be 705 ℃ and the casting pressure to be 0.23MPa during casting in the step (2).
And (3) controlling the ultrasonic frequency to be 770kHz during ultrasonic treatment in the step (2).
The heating treatment in the step (3) is specifically that the temperature is increased to 510 ℃ within 3.8h, and then the heat preservation treatment is carried out for 6h at the temperature.
The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for treatment for 7min; the water quenching liquid consists of the following components in parts by weight: 5 parts of nano titanium carbide, 0.4 part of hexadecyl trimethyl ammonium bromide, 1.3 parts of sodium pyrophosphate, 1.5 parts of silane coupling agent and 280 parts of deionized water.
The artificial aging treatment in the step (4) is heat preservation treatment for 5.5 hours at the temperature of 150-160 ℃.
Example 3:
the casting process of the connecting cross rod of the treadmill handle comprises the following steps:
(1) Alloy smelting treatment:
smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;
(2) Pouring treatment:
carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;
(3) And (3) heat treatment:
carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;
(4) Aging treatment:
and (5) after natural cooling, carrying out man-hour effect treatment, polishing after the man-hour effect treatment is finished, and inspecting to obtain the finished product.
The alloy in the step (1) comprises the following components in percentage by weight: 9.5% silicon, 0.2% iron, 0.5% magnesium, 0.3% copper, 0.7% manganese, 0.04% titanium, 0.03% boron, 0.4% impurities, and the balance aluminum.
The addition amount of the modifier in the step (1) is 1 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 760 ℃ in the furnace.
The modifier consists of the following components in parts by weight: 25 parts of strontium, 15 parts of chromium, 3 parts of yttrium and 8 parts of silver.
Controlling the temperature in the furnace to 770 ℃ during degassing in the step (1); and controlling the tapping temperature to be 735 ℃ during tapping.
And (3) controlling the casting temperature to be 710 ℃ and controlling the pressure to be 0.25MPa during casting in the step (2).
And (3) controlling the ultrasonic frequency to be 800kHz during ultrasonic treatment in the step (2).
The heating treatment in the step (3) is specifically to heat the temperature to 520 ℃ within 4h, and then carry out heat preservation treatment for 7h at the temperature.
The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for 8min; the water quenching liquid consists of the following components in parts by weight: 6 parts of nano titanium carbide, 0.5 part of hexadecyl trimethyl ammonium bromide, 1.5 parts of sodium pyrophosphate, 2 parts of silane coupling agent and 300 parts of deionized water.
The artificial aging treatment in the step (4) is heat preservation treatment for 6 hours at the temperature of 150-160 ℃.
Comparative example 1
This comparative example 1 is different from example 2 only in that yttrium, a component of the modifier, is omitted in step (1), and the process steps are the same except for this.
Comparative example 2
This comparative example 2 is compared with example 2 only with the difference that the modifier is omitted in step (1) and the process steps are identical except for the exception.
Comparative example 3
This comparative example 3 is different from example 2 only in that the water quenching liquid was replaced with ordinary clean water in the step (3), except that the other steps of the method were the same.
In order to compare the effects of the present invention, the handle connecting cross bar prepared in the above example 2, comparative example 1, comparative example 2, and comparative example 3 was subjected to a performance test, and the specific results are shown in the following table 1:
TABLE 1
Note: the tensile strength, yield strength and elongation at break described in table 1 above were all determined according to national standards; the average abrasion loss is measured by performing an abrasion experiment on the surface of the cross rod, the experiment specifically comprises the step of performing the abrasion experiment on the surface of the cross rod by using a disc-cutting abrasion tester, the load of the experiment is 80N, the rotating speed is 600 revolutions per minute, and the experiment time is 60min; the acid resistance duration refers to the duration of the unchanged surface of the cross rod observed by soaking the cross rod in a sulfuric acid solution with the mass fraction of 5%, keeping the temperature at 35 ℃, and comparing the acid resistance characteristics.
As can be seen from table 1 above, the comprehensive quality of the handle connecting cross bar manufactured by the method of the present invention is significantly improved and enhanced, and compared with the conventional processing method, the method of the present invention has the advantages of product performance, and also has the characteristics of few processing procedures, and has great market competitiveness.
The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The casting process of the connecting cross rod of the treadmill handle is characterized by comprising the following steps of:
(1) Alloy smelting treatment:
smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;
(2) Pouring treatment:
carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment in the process, and taking out and cooling for later use after the ultrasonic treatment is finished;
(3) And (3) heat treatment:
carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;
(4) Aging treatment:
after natural cooling is completed, man-hour effect treatment is performed, polishing is performed after the man-hour effect treatment is completed, and the man-hour effect treatment can be performed after inspection is qualified;
wherein the water quenching cooling treatment in the step (3) is specifically that the alloy is put into water quenching liquid and treated for 5 to 8min; the water quenching liquid consists of the following components in parts by weight: 3 to 6 parts of nano titanium carbide, 0.3 to 0.5 part of hexadecyl trimethyl ammonium bromide, 1 to 1.5 parts of sodium pyrophosphate, 1 to 2 parts of a silane coupling agent and 260 to 300 parts of deionized water.
2. A casting process of a treadmill handlebar connecting cross bar as in claim 1, wherein the alloy in step (1) comprises the following components in the respective weight percentages: 8.0 to 9.5 percent of silicon, 0.1 to 0.2 percent of iron, 0.3 to 0.5 percent of magnesium, 0.1 to 0.3 percent of copper, 0.4 to 0.7 percent of manganese, 0.01 to 0.04 percent of titanium, 0.01 to 0.03 percent of boron, 0.1 to 0.4 percent of impurities and the balance of aluminum.
3. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the addition amount of the modifier in the step (1) is 0.5 to 1 percent of the total mass of the alloy; the temperature in a corresponding furnace is 750 to 760 ℃ when the modifier is added.
4. The casting process of the treadmill handle connecting cross bar of claim 3, wherein the modifier is composed of the following components in parts by weight: 20 to 25 parts of strontium, 10 to 15 parts of chromium, 1 to 3 parts of yttrium and 4 to 8 parts of silver.
5. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the temperature in the furnace is controlled to be 760 to 770 ℃ during degassing in step (1); and controlling the tapping temperature to be 725 to 735 ℃ during tapping.
6. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the casting temperature in the step (2) is controlled to be 700 to 710 ℃, and the control pressure is controlled to be 0.2 to 0.25MPa.
7. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the ultrasonic frequency is controlled to be 700 to 800kHz during the ultrasonic treatment in the step (2).
8. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the heating heat treatment in the step (3) is specifically heating to 500 to 520 ℃ within 3.5 to 4h, and then performing heat preservation treatment for 5 to 7h at the temperature.
9. A casting process of the treadmill handle connecting cross bar according to claim 1, wherein the artificial aging treatment in the step (4) is performed for 5 to 6h at a temperature of 150 to 160 ℃.
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| CN202111085017.8A CN113680993B (en) | 2021-09-16 | 2021-09-16 | Casting process of connecting cross rod of treadmill handle |
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| CN202111085017.8A CN113680993B (en) | 2021-09-16 | 2021-09-16 | Casting process of connecting cross rod of treadmill handle |
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| CN113680993B true CN113680993B (en) | 2022-11-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000071772A1 (en) * | 1999-05-25 | 2000-11-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration (Nasa) | Aluminum-silicon alloy having improved properties at elevated temperatures |
| CN108070754A (en) * | 2016-11-08 | 2018-05-25 | 通用汽车环球科技运作有限责任公司 | Improve the intensity of aluminium alloy |
| CN108165796A (en) * | 2017-12-16 | 2018-06-15 | 长沙无道工业设计有限公司 | A kind of aluminium section for buildings method of modifying |
| CN108823518A (en) * | 2018-07-05 | 2018-11-16 | 哈尔滨理工大学 | A kind of preparation method of high thermal conductivity alusil alloy bar |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8758529B2 (en) * | 2010-06-30 | 2014-06-24 | GM Global Technology Operations LLC | Cast aluminum alloys |
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- 2021-09-16 CN CN202111085017.8A patent/CN113680993B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000071772A1 (en) * | 1999-05-25 | 2000-11-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration (Nasa) | Aluminum-silicon alloy having improved properties at elevated temperatures |
| CN108070754A (en) * | 2016-11-08 | 2018-05-25 | 通用汽车环球科技运作有限责任公司 | Improve the intensity of aluminium alloy |
| CN108165796A (en) * | 2017-12-16 | 2018-06-15 | 长沙无道工业设计有限公司 | A kind of aluminium section for buildings method of modifying |
| CN108823518A (en) * | 2018-07-05 | 2018-11-16 | 哈尔滨理工大学 | A kind of preparation method of high thermal conductivity alusil alloy bar |
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