CN1546985A - Method and device for measuring liquid average porosity of close pore foamed aluminium or alloy - Google Patents
Method and device for measuring liquid average porosity of close pore foamed aluminium or alloy Download PDFInfo
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- CN1546985A CN1546985A CNA2003101064958A CN200310106495A CN1546985A CN 1546985 A CN1546985 A CN 1546985A CN A2003101064958 A CNA2003101064958 A CN A2003101064958A CN 200310106495 A CN200310106495 A CN 200310106495A CN 1546985 A CN1546985 A CN 1546985A
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Abstract
The invention discloses a method for measuring liquid even porosity of closed hole foam aluminum or alloy. The method is: the first step, uses shift sensor to measure the relation of the height H of the closed hole foam aluminum or alloy melted body and time t. the second step, according to P=1-VAl (S.H), the invention can acquires the relation of the even porosity P and time t, the VAl is the volume of aluminum or alloy liquid, the S is crucible inner bottom area. The invention also discloses a device for measuring the even porosity of closed hole foam aluminum or alloy liquid, which includes a heat resisting cushion, heat resisting and oxidization resisting metal silk, thin rope, fixed sliding wheel, shift sensor. The heat resisting piece is placed on the melted liquid, the cushion is connected to the fixing sliding wheel rope through the metal silk, and the tightened rope acquires the shift signal and transmits into the shift sensor. The method is reliable and accurate.
Description
One, technical field
The present invention relates to the measuring method of a kind of foamed aluminium or alloy porosity, relate in particular to a kind of measurement closed-cell aluminum foam or alloy liquid mean porosities method and device.
Two, background technology
The main armrest of method of measuring closed-cell aluminum foam or alloy liquid mean porosities at present moves the method for the height of tape measure aluminium alloy melt foaming process, and its precision is relatively poor, operating difficulties.Because every performance of closed-cell aluminum foam mainly is the function of porosity, it is very necessary therefore accurately to measure closed-cell aluminum foam or foam aluminium alloy porosity.
Three, summary of the invention
The invention provides a kind of method and apparatus of measuring the liquid mean porosities of closed-cell aluminum foam, it is easy to operate, the precision height.
The present invention adopts following technical scheme:
A kind of method that is used to measure closed-cell aluminum foam or alloy liquid mean porosities comprises the steps: the first step, goes out closed-cell aluminum foam or alloy melt height H t variation relation in time with displacement sensor, and second step is according to P=1-V
Al/ (S.H),, can obtain the relation of closed-cell aluminum foam or alloy melt mean porosities P t variation in time with H variation relation substitution in time, wherein, V
AlBe the volume of aluminium or alloy liquid, S is long-pending for the crucible inner bottom surface.
A kind of device of measuring closed-cell aluminum foam or alloy liquid mean porosities, comprise super gasket 4, heat-resisting oxidation-resistance tinsel 5, cord 12, fixed pulley 7, displacement transducer 9, super gasket 4 is positioned on the foamed aluminium melt liquid level 3, on the cord 12 of super gasket 4 by the tensioning heat-resisting, that anti-oxidation metal silk 5 is connected in fixed pulley 7, the displacement signal input displacement transducer 9 that the cord 12 of tensioning obtains.
The present invention obtains following technique effect:
(1) the expansion forward position that contacts with air of closed-cell aluminum foam or alloy (can be fine aluminium, aluminium copper, Alpax, almag) melt is near the plane, if the foam melt height is H, in foaming process, change with foamed time t (begin the foaming stirring and count t=0 constantly), in crucible floorage one regularly, the liquid mean porosities of foamed aluminium melt and foam melt height H have certain corresponding relation: P=1-V
Al/ (S.H), V
AlBe the volume of entity aluminium, the crucible inner bottom surface is long-pending to be S, the volume V=S.H of foamed aluminium melt.The present invention measures melt height H t variation relation in time by adopting high-precision displacement transducer, and then obtains the relation of the liquid mean porosities P of accurate foamed aluminium t variation in time, and error is no more than 1%, and this method is reliable.It is bigger that the scope that adopts the displacement transducer of relatively large journey make to measure becomes, and is suitable for the big characteristics of displacement in foamed aluminium or the alloy melt foaming process.
(2) the foam aluminium alloy melt expands and makes the height of melt liquid level change, the super gasket 4 that is placed on it is upwards pushed up, the tensioning of cord 12 is that the load by the pulley both sides realizes, the cord 12 by heat-resisting oxidation-resistance tinsel 5 and fixed pulley 7 and tensioning is input to the variation of foam aluminium alloy melt height in displacement transducer and the displacement display device 9.Adopt sheet asbestos or paster as super gasket among the present invention, and adopted the heat-resisting oxidation-resistance tinsel, made that this device is durable, adopted displacement transducer to make reliable results, the precision height of this device.
(3) adopted the bigger displacement transducer of high resolving power and precision, maximum range to make the resultant error that obtains be no more than 1%, and it is big and require the requirement of relatively large journey scope to have adapted to liquid level displacement in the melt foaming process.
(4) analog quantity that displacement transducer is obtained is carried out mould/number conversion and is imported computing machine, can obtain melt height H t continually varying result in time by higher sample frequency, and then obtains continually varying porosity P t variation relation in time.
(5) in the foaming process,, make and foam melt liquid level injustice cause the drift of super gasket occurred level direction in the process that rises, cause error owing to factors such as stirrings.The present invention has adopted vertical location cylinder to limit super gasket displacement in the horizontal direction, has reduced measuring error.
(6) super gasket and gravity wiry go up to the foam melt certain influence, increasing balance bob can be so that influence diminishes, also increase the rate of tension of cord in addition, reduced it and in motion process, lax possibility has taken place suddenly, improved the reliability of measuring accuracy and device owing to the frictional resistance of pulley.
(7) the present invention is available as the liquid phase porosity of control foamed aluminium or alloy, and provides very big reference role for the control of foamed aluminium or alloy solid porosity.
Four description of drawings
Fig. 1 is a porosity measurement apparatus structure synoptic diagram of the present invention
Fig. 2 be the present invention by the porosity measurement measurement device and through the porosity P that is converted to t variation relation in time
Five specific embodiments
Embodiment is used for accurately measuring the method for closed-cell aluminum foam or alloy liquid mean porosities for 1 one kinds, comprises the steps: the first step, goes out foamed aluminium or alloy melt height H t variation relation in time with displacement sensor, and second step is according to P=1-V
Al/ (S.H),, can obtain the relation of foamed aluminium or alloy melt mean porosities P t variation in time with H variation relation substitution in time, wherein, V
AlBe the volume of aluminium or alloy liquid, S is long-pending for the crucible inner bottom surface, and in the present embodiment, crucible can be chosen the rectangular parallelepiped crucible of square bottom surface, and floorage is 0.01 square metre, the volume V of aluminium liquid
AlCan be taken as 0.000315 cubic metre, foamed is later in 50s～158s, elemental height 80mm to the end the 200mm (crucible basal surface position height be 0) of its height from measuring, above-mentioned height substitution formula is calculated, its porosity changes to 84% from 66.5%, so can obtain liquid mean porosities P t variation relation in time.
Embodiment is used for accurately measuring the device of closed-cell aluminum foam or the variation of alloy liquid mean porosities for 2 one kinds, comprise super gasket 4, heat-resisting oxidation-resistance tinsel 5, cord 12, fixed pulley 7, displacement transducer 9, super gasket 4 is positioned on the foamed aluminium melt liquid level 3, super gasket 4 is by heat-resisting, anti-oxidation metal silk 5 is connected on the cord 12 of fixed pulley 7, displacement signal input displacement transducer and displacement display device 9 that cord 12 obtains, in the present embodiment, the resolution of displacement transducer and displacement display device 9 is 0.5～1.5mm, can be 0.5mm, 1.0mm 1.5mm, maximum range are 80～150mm, can be 80mm, 100mm, 120mm, 150mm, 180mm, 200mm, displacement transducer 9 inserts the computing machine 11 of the mould/analog-to-digital conversion apparatus 10 that has at least 12 precision, and super gasket 4 can be sheet asbestos or iron plate, displacement measurement probe 1 tinsel that is connected 5 passes a vertical location cylinder 6, hangs with balance bob 8 on the cord 12 of the opposite side tensioning of fixed pulley 7.
Implementation method is as follows: the aluminium alloy (as aluminium copper) of certain mass (desirable 0.85 kilogram) is placed in the rectangular parallelepiped crucible, be heated to fusing, add tackifier (as calcium) and stirred tackify 6～15 minutes, add an amount of gas-development agent and stir certain hour (note stirs start time t=0), propose paddle after stirring finishes immediately, and super gasket is positioned on the liquid level fast simultaneously and (notes the elemental height H of melt liquid level simultaneously
0), when the foam melt goes up, the promotion super gasket moves up, these unique signals are reflected in the displacement transducer by the fixed pulley actuator system, with displacement transducer record melt height H t variation relation in time, and in computing machine, this relation converted to porosity P t variation relation in time.
Claims (7)
1. a method that is used to measure closed-cell aluminum foam or alloy liquid mean porosities is characterized in that comprising the steps: the first step, goes out closed-cell aluminum foam or alloy melt height H t variation relation in time with displacement sensor, and second step is according to P=1-V
Al/ (SH),, can obtain the relation of closed-cell aluminum foam or alloy melt mean porosities P t variation in time with H variation relation substitution in time, wherein, V
AlBe the volume of aluminium or alloy liquid, S is long-pending for the crucible inner bottom surface.
2. the device of measurement closed-cell aluminum foam according to claim 1 or alloy liquid mean porosities method, it is characterized in that comprising super gasket (4), heat-resisting oxidation-resistance tinsel (5), cord (12), fixed pulley (7), displacement transducer (9), super gasket (4) is positioned on the closed-cell aluminum foam melt liquid level (3), on the cord (12) of super gasket (4) by the tensioning heat-resisting, that anti-oxidation metal silk (5) is connected in fixed pulley (7), the displacement signal input displacement transducer (9) that the cord of tensioning (12) obtains.
3. the device that measurement closed-cell aluminum foam according to claim 2 or alloy liquid mean porosities change, the resolution that it is characterized in that displacement transducer (9) is 0.5～1.5mm, maximum range is 80～200mm.
4. the device that measurement closed-cell aluminum foam according to claim 2 or alloy liquid mean porosities change is characterized in that displacement transducer (9) inserts the computing machine (11) of the mould/analog-to-digital conversion apparatus (10) that has at least 12 precision.
5. the device that measurement closed-cell aluminum foam according to claim 2 or alloy liquid mean porosities change is characterized in that super gasket (4) is sheet asbestos or iron plate.
6. the device that measurement closed-cell aluminum foam according to claim 2 or alloy liquid mean porosities change is characterized in that the tinsel (5) that super gasket (4) is connected passes a vertical location cylinder (6).
7. the device that measurement closed-cell aluminum foam according to claim 2 or alloy liquid mean porosities change is characterized in that hanging with balance bob (8) on the cord (12) of opposite side tensioning of fixed pulley (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106495 CN1233999C (en) | 2003-12-03 | 2003-12-03 | Method and device for measuring liquid average porosity of close pore foamed aluminium or alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106495 CN1233999C (en) | 2003-12-03 | 2003-12-03 | Method and device for measuring liquid average porosity of close pore foamed aluminium or alloy |
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| Publication Number | Publication Date |
|---|---|
| CN1546985A true CN1546985A (en) | 2004-11-17 |
| CN1233999C CN1233999C (en) | 2005-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310106495 Expired - Fee Related CN1233999C (en) | 2003-12-03 | 2003-12-03 | Method and device for measuring liquid average porosity of close pore foamed aluminium or alloy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969497A (en) * | 2014-05-22 | 2014-08-06 | 营口东吉科技（集团）有限公司 | Method for measuring arc current of alternating-current electric-arc furnace |
| CN105424574A (en) * | 2015-11-10 | 2016-03-23 | 国网吉林省电力有限公司电力科学研究院 | Quantitative characterization method for foam aluminum alloy porosity and dispersity |
| CN105938079A (en) * | 2016-06-29 | 2016-09-14 | 东南大学 | Device and method for measuring apparent viscosity and porosity of foamed aluminum melt in real time |
-
2003
- 2003-12-03 CN CN 200310106495 patent/CN1233999C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969497A (en) * | 2014-05-22 | 2014-08-06 | 营口东吉科技（集团）有限公司 | Method for measuring arc current of alternating-current electric-arc furnace |
| CN103969497B (en) * | 2014-05-22 | 2017-05-17 | 营口东吉科技（集团）有限公司 | Method for measuring arc current of alternating-current electric-arc furnace |
| CN105424574A (en) * | 2015-11-10 | 2016-03-23 | 国网吉林省电力有限公司电力科学研究院 | Quantitative characterization method for foam aluminum alloy porosity and dispersity |
| CN105938079A (en) * | 2016-06-29 | 2016-09-14 | 东南大学 | Device and method for measuring apparent viscosity and porosity of foamed aluminum melt in real time |
| CN105938079B (en) * | 2016-06-29 | 2018-06-01 | 东南大学 | The apparent viscosity of foam aluminum melt and the real-time measurement apparatus of porosity and method |
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| Publication number | Publication date |
|---|---|
| CN1233999C (en) | 2005-12-28 |
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Granted publication date: 20051228 Termination date: 20100104 |