CN105510149A - Sag resistance testing die of aluminium foils for heat exchanger fins - Google Patents
Sag resistance testing die of aluminium foils for heat exchanger fins Download PDFInfo
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- CN105510149A CN105510149A CN201510846278.5A CN201510846278A CN105510149A CN 105510149 A CN105510149 A CN 105510149A CN 201510846278 A CN201510846278 A CN 201510846278A CN 105510149 A CN105510149 A CN 105510149A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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Abstract
The invention relates to a sag resistance testing die of aluminium foils for heat exchanger fins. The die comprises a pedestal, a pair of flat platforms which are isolated from each other and are fixed on the pedestal, a pair of pressing plates which are respectively arranged on the pair of platforms and are used for respectively pressing two ends of an elongated sample onto planes of the corresponding platforms, and a pair of parallel guide rollers which are tangent to the horizontal plane from below. Upper planes of the pair of platforms are positioned at the same horizontal plane and have a pair of opposite edges which face towards each other. A center line is determined between the opposite edges. The guide rollers are arranged symmetrically relative to the center line between the opposite edges between the pair of platforms. According to the die, influence of length of an aluminium foil's free end on sag resistant performance value is eliminated when one end is fixed, and effective lengths of all aluminium foils to be detected are consistent so as to avoid experimental errors caused by man-made unequal lengths of the free ends. Results are more accurate and reliable.
Description
Technical field
The present invention relates generally to a kind of anti-sag test mould, particularly relates to a kind of mould for the anti-sag test of heat-exchanger fin aluminium foil.
Background technology
Car heat exchanger is the important component part of car engine cooling system, and traditional heat exchanger all adopts copper as the main material of heat exchanger, and this is because copper has good formability, thermal conductivity, corrosion stability and braze ability.Heat exchanger is progressively to light-duty, efficient, economic trend development in recent years, and the calorize rate of automobile is also progressively improving, and aluminium heat exchanger progressively instead of copper heat exchanger.Due to rust-preventing aluminum alloy there is lightweight, good heat dissipation effect, energy-conservation, durable, mounting or dismounting are convenient, cost is low, practical and economic dispatch plurality of advantages, therefore, in aluminum-made heat exchanger, the rust-preventing aluminum alloy material that corrosion resistance can be used good replaces Cu alloy material.
The structural representation of car heat exchanger as shown in Figure 1.Heat exchanger mainly comprises extruded tube I, heat radiator II.Extruded tube in heat exchanger forms primarily of fine aluminium or Al-Mn system alloy extrusion, and heat radiator and heat-exchanger fin adopt aluminium alloy foil or Composite Brazing Aluminium Foil band.Composite insulating foil is by brazing material (skin material) and parent metal (core) by certain cladding ratio, and use through certain combination process lamellar composite, the aluminium foil that compound is good is brazed on extruded tube together.At present, aluminium alloy foil material for heat exchanger fin finished product thickness is between 0.06mm ~ 0.1mm, and this material need be brazed together by high temperature and extruded tube.In brazing process, so thin aluminium foil will continue nearly ten minutes under the environment of the high temperature of 580 DEG C ~ 610 DEG C and certain pressure, is easy to subside sagging, causes scrapping of heat exchanger.Research finds, two sagging main causes occur aluminium alloy composite insulating foil, and wherein topmost reason is, after simulation soldering, the skin material of fusing spreads along the crystal boundary of core metal, corrode core, the section of core is diminished, reduces the section bending strength of metal, cause generation sagging; Secondly due under high temperature, core metal generation recrystallization, reduces the intensity of self.
In order to ensure the good welds of heat-exchanger fin and extruded tube, heat-exchanger fin need have good sink-resistance performance.Namely sink-resistance performance resists the ability of self sagging deflections under uniform temperature and certain load effect.Therefore need measurement aluminium foil being carried out to sink-resistance performance, evaluate the ability that high temperature deformation resisted by aluminium foil in brazing process.Test method mainly with reference to the Japanese low-temperature welding council in industry carries out the sink-resistance performance measuring aluminium foil.
As shown in Figure 2 a, it is fixed by the first end III aluminium foil to be checked the facade structures schematic diagram of the anti-sag test mould of the low-temperature welding council of Japan, and the second end IV freely dangles, and carries out simulation soldering.Elevational schematic view sagging after aluminium foil simulation soldering as shown in Figure 2 b.The method has certain limitation: the method is in simulation brazing process, free end length is very large on the impact of sink-resistance performance value, under similarity condition, free end length is longer, and the sagging value recorded is larger, and the device that the method adopts accurately cannot ensure that free end length is equally long; And result only has sagging value to characterize, have ignored the impact of load, inconsistent with actual soldering situation, because during actual soldering, be that extruded tube-fin-extruded tube-fin-extruded tube is arranged in pairs or groups welding like this, two can give fin certain pressure load between extruded tube and extruded tube; This test method requires higher to sample and assembling process, even commaterial, if sample is improper with assembling, will obtain different results; In addition, the device that the method adopts, its sag of chain needs manually to measure, and measuring error is large, and in measuring process, be very easy to touching aluminium foil, causes aluminium foil to be out of shape.
Summary of the invention
The object of the present invention is to provide the mould of the anti-sag test of a kind of heat-exchanger fin aluminium foil, to overcome the defect that above-mentioned prior art exists.
To achieve these goals, the invention provides a kind of mould for the anti-sag test of heat-exchanger fin aluminium foil, comprise a pedestal; Be spaced from each other for a pair the surface platform be fixed on pedestal, and this is positioned at same surface level to the upper plane of platform and has a pair opposed facing opposite edge, determines a center line between described opposite edge; This is divided into the pressing plate on platform, for a strip sample is pressed on plane corresponding platform from two ends respectively with a pair; Also comprise a pair tangent with described surface level from below parallel guide roller, described guide roller is arranged in this between platform symmetrically relative to the center line between described opposite edge.Like this, even described, that is uneven or jagged to opposite edge chamfering, does not also affect the test findings of the anti-sag test of heat-exchanger fin aluminium foil.
Further, above-mentioned mould also comprises one group of locating slot, for being located described strip sample at described centerline direction.Described locating slot upwards extends from described pedestal, and form the cylinder with lower end and upper end, the upper surface of this upper end exceeds plane certain distance on described platform.
Further, above-mentioned mould also comprises one group and fixes gage, and this group is fixed gage and described that and organized locating slot and be symmetrical arranged with the center line between described opposite edge.Described fixing gage upwards extends from described pedestal, forms the cylinder with bottom and top.The upper surface on this top exceeds plane certain distance on described platform.This fixing gage indicates continuous print length scale value from bottom to top.
Further, above-mentioned mould also comprises cylinder counterweight, and when pressurization is installed, its both sides are resisted against on described locating slot and described fixing gage respectively, and its center falls within the center line between described opposite edge.
In addition, the mould of the anti-sag test of above-mentioned heat-exchanger fin aluminium foil also comprises one group of bolt, for connecting described platform and pressing plate and clamping described strip sample.
Preferably, above-mentioned mould also comprises a picture group nail, for fixing described strip sample and described pressing plate.
The mould of the anti-sag test of heat-exchanger fin aluminium foil of the present invention, the deformability of sample to be checked under different loads of commaterial can be compared, also can ensure that the load that the sample to be checked of different materials applies is identical, the result comparison obtained is strong.By measuring counterweight weight used and reading the scale fixing gage, the sag of chain of aluminium foil to be checked and the ability of anti-deforming can be obtained more accurately and easily.Significantly, the anti-sag test mould proposed makes the effective length of all aluminium foils to be checked consistent, and eliminating people when adopting one end to fix is that the free end length caused does not wait the error produced, and its result more accurately, reliably.
Accompanying drawing explanation
Fig. 1 is the structural representation of car heat exchanger;
Fig. 2 a is the facade structures schematic diagram of the anti-sag test mould of the Japanese low-temperature welding council;
Fig. 2 b is elevational schematic view sagging after the anti-sag test mould simulation soldering according to the Japanese low-temperature welding council;
Fig. 3 is anti-sag test mould structure schematic perspective view according to a first embodiment of the present invention;
Fig. 4 a is the facade structures schematic diagram of anti-sag test mould before simulating Braze tests according to a first embodiment of the present invention and heat-exchanger fin aluminium foil;
Fig. 4 b is the facade structures schematic diagram of anti-sag test mould after simulating Braze tests according to a first embodiment of the present invention and heat-exchanger fin aluminium foil; And
Fig. 5 is anti-sag test mould plan structure schematic diagram according to a second embodiment of the present invention;
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in more details, the advantage of the solution of the present invention and its various aspects can be understood better.But embodiment described below and embodiment are only the objects illustrated, instead of limitation of the present invention.
First embodiment
Fig. 3 is mould structure schematic perspective view according to a first embodiment of the present invention, and Fig. 4 a is the facade structures schematic diagram of anti-sag test mould before simulating Braze tests according to a first embodiment of the present invention and heat-exchanger fin aluminium foil.As shown in the figure, this mould comprises a pedestal 1; Be spaced from each other for a pair the surface platform 2 be fixed on pedestal, and this is positioned at same surface level to the upper plane 20 of platform and has a pair opposed facing opposite edge 21, determines a center line 22 between described opposite edge 21; This is divided into the pressing plate 3 on platform, for a strip sample 4 is pressed on plane 20 corresponding platform respectively from two ends with a pair.This mould also comprises a pair parallel guide roller 5 tangent with described surface level from below, and described guide roller is arranged symmetrically relative to the center line 22 between described opposite edge 21.
Further, above-mentioned mould also comprises one group of locating slot 6, and it is disposed on the side of the center line 22 between described opposite edge 21, for being located described strip sample 4 at described centerline direction.Described locating slot 6 upwards extends from described pedestal, and form the cylinder with lower end 61 and upper end 62, the upper surface 621 of this upper end 62 exceeds upper plane 20 certain distance of described platform.
Further, above-mentioned mould also comprises one group and fixes gage 7, and this group is fixed gage 7 and described that and organized locating slot 6 and be symmetrical arranged with the center line 22 between described opposite edge 21.Described fixing gage 7 upwards extends from described pedestal 1, forms the cylinder with bottom 71 and top 72.The upper surface 721 on this top 72 exceeds plane 20 certain distance on described platform.This fixing gage 7 indicates continuous print length scale value from 71 to top, bottom 72.
Further, above-mentioned mould also comprises cylinder counterweight 8, and when pressurization is installed, its both sides are resisted against on described locating slot 6 and described fixing gage 7 respectively, and its center falls within the center line 22 between described opposite edge 21.Multiple cylinder counterweight can be configured as required.
In addition, the mould of the anti-sag test of above-mentioned heat-exchanger fin aluminium foil also comprises one group of bolt 9, for connecting described platform 2 and pressing plate 3 to clamp described strip sample 4.
Preferably, above-mentioned mould also comprises a picture group nail 10, for fixing described strip sample and described pressing plate 3.
The anti-sag test process of the heat-exchanger fin aluminium foil that anti-sagging mould according to a first embodiment of the present invention carries out is:
(1) the aluminium alloy compound foil of the thick double-clad of a kind of 0.08mm is chosen, be prepared into the sample 4 of 120mm (roll to) × 15mm (transverse direction), make sample smooth by stretching for aluminium foil both sides, use described pressing plate 3 and bolt 9 to be fixed in the upper plane 20 of platform 2 at the two ends of heat-exchanger fin aluminium foil sample 4 to be detected, and make aluminium foil sample 4 to be checked symmetrical relative to the center line 22 between described opposite edge 21 with described guide roller 5;
(2) weight weighing cylinder counterweight 8 is m1, and record, cylinder counterweight 8 is placed corresponding to center line 22 position between described opposite edge 21 at aluminium foil sample 4 to be checked, make described cylinder counterweight about 8 respectively against upper described fixing gage 7 and locating slot 6, apply suitable load to aluminium foil sample 4 to be checked by this step;
(3) contrast described fixing gage 7, read the position height H1 of the now upper surface center of aluminium foil sample 4 to be checked.
(4) be fixed with the aluminium foil mould to be checked after pressurization and be placed in heating furnace by above-mentioned and heat, programming rate is 25 DEG C/min, at 600 DEG C of insulation 10min, carries out simulation Braze tests.
(5) after simulation soldering terminates, air cooling of being come out of the stove by above-mentioned mould, contrasts described fixing gage 7, reads the position height H11 of the now upper surface center of aluminium foil sample 4 to be checked;
(6) according to the position height difference H1-H11 of aluminium foil sample 4 center to be checked before and after the weight m1 of cylinder counterweight 8 added on aluminium foil sample 4 to be checked and simulation soldering, sagging value (the H1-H11)/m1 of specific loading is calculated.
Anti-sag test mould before and after this embodiment simulation Braze tests and the facade structures schematic diagram of heat-exchanger fin aluminium foil are as Fig. 4 a and Fig. 4 b.
The mould of the anti-sag test of heat-exchanger fin aluminium foil of the embodiment of the present invention, the aluminium foil to be checked of unlike material can be chosen during test, repeat above-mentioned steps to test, the sink-resistance performance size between the aluminium foil weighing unlike material with the sagging value of same units load.Also different load can be applied to determine the deformability of the aluminium foil of this kind of material under different loads to the aluminium foil of same material.
Second embodiment
Fig. 5 is anti-sag test mould plan structure schematic diagram according to a second embodiment of the present invention.This embodiment is different from the first embodiment and is: this embodiment can detect the sagging value of 4 groups of aluminium foils simultaneously, and the first embodiment only can detect the sagging value of one group of aluminium foil.Therefore, the anti-sag test mould of this embodiment is also corresponding has done change, makes it rear before a mold and, to lengthening, makes this mould can fix 4 groups of aluminium foils to be checked simultaneously.Accordingly, pedestal 100, platform 200, guide roller 500 and pressing plate 300 are all lengthened out, and the quantity of set bolt 900, drawing pin 1000, cylinder counterweight 800, fixing gage 700 and locating slot 600 all increases.The structure and fuction of each several part device in this embodiment, with embodiment one, does not repeat them here.Adopt the process of the test of this mould to be similar to embodiment one, be only briefly described at this:
Choosing thick is 0.08mm, the aluminium alloy compound foil sample 400 of double-clad, be prepared into 4, the sample of 120mm (roll to) × 15mm (transverse direction), then be placed on mould, with pressing plate 300, set bolt 900, sample is compressed, and by drawing pin 1000 through the hole that pressing plate 300 is accomplished fluently in advance, aluminium foil is fixed;
Weigh the weight of four groups of cylinder counterweights 800, and record, be respectively mc1, mc2, mc3, mc4;
On four groups of aluminium foils, place one group of cylinder counterweight 800 separately respectively, the elemental height of 4 aluminium foils on gage 700 now fixed in record, Hc1, Hc2, Hc3, Hc4;
This device is put into heating furnace heat, programming rate is 25 DEG C/min, at 600 DEG C of insulation 10min, carries out simulation Braze tests.After the time, air cooling of coming out of the stove;
After measure analog soldering, the center height of 4 aluminium foils, is respectively hc1, hc2, hc3, hc4;
The sagging value of specific loading of first aluminium foil is sg1=(Hc1-hc1)/m1, by that analogy, calculates the sagging value of specific loading of other three groups of aluminium foils, is respectively sg2, sg3, sg4;
Finally obtain the sagging value sg=(sg1+sg2+sg3+sg4)/4 of the aluminium alloy compound foil mean unit load of this kind of thick double-clad for 0.08mm.
Also can choose same size but the aluminium alloy compound foil of four of unlike material groups of double-clad, load identical load, carry out test as above, draw the sagging value of the specific loading of four groups of unlike material aluminium foils.
The mould of the anti-sag test of heat-exchanger fin aluminium foil of the embodiment of the present invention, the deformability of sample to be checked under different load of commaterial can be compared, also can compare the deformability of aluminium foil sample under same load of different materials, the result comparison obtained is strong.
The counterweight that above-mentioned first embodiment and the second embodiment are carried by mould and fixing gage, can obtain the sag of chain of aluminium foil to be checked and the ability of anti-deforming more accurately and easily.And the two ends stationary installation of the anti-sagging mould proposed makes the effective length of all aluminium foils to be checked consistent, eliminating people when adopting one end to fix is that the free end length caused does not wait the error produced, and its result more accurately, reliably.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (6)
1., for a mould for the anti-sag test of heat-exchanger fin aluminium foil, comprise a pedestal; Be spaced from each other for a pair the surface platform be fixed on pedestal, and this is positioned at same surface level to the upper plane of platform and has a pair opposed facing opposite edge, determines a center line between described opposite edge; This is divided into the pressing plate on platform, for a strip sample is pressed on plane corresponding platform from two ends respectively with a pair; Also comprise a pair tangent with described surface level from below parallel guide roller, described guide roller is arranged in this between platform symmetrically relative to the center line between described opposite edge.
2. mould according to claim 1, is characterized in that, also comprises one group of locating slot, for being located described strip sample at described centerline direction; Described locating slot upwards extends from described pedestal, and form the cylinder with lower end and upper end, the upper surface of this upper end exceeds plane certain distance on described platform.
3. the mould according to claim 1 or 3, is characterized in that, also comprises one group and fixes gage, and this group is fixed gage and described that and organized locating slot and be symmetrical arranged with the center line between described opposite edge; Described fixing gage upwards extends from described pedestal, is formed and has the cylinder on bottom and top, plane certain distance on the platform that the upper surface on this top exceeds described pedestal; This fixing gage indicates continuous print length scale value from bottom to top.
4. mould according to claim 1, is characterized in that, also comprises cylinder counterweight, and when pressurization is installed, its both sides are resisted against on described locating slot and described fixing gage respectively, and its center falls within the center line between described opposite edge.
5. mould according to claim 1, is characterized in that, also comprises bolt, for connecting described platform and pressing plate to clamp described strip sample.
6. mould according to claim 1, is characterized in that, also comprises drawing pin, for fixing described strip sample and described pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846278.5A CN105510149B (en) | 2015-11-26 | 2015-11-26 | The mold that heat-exchanger fin is tested with aluminium foil sag resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510846278.5A CN105510149B (en) | 2015-11-26 | 2015-11-26 | The mold that heat-exchanger fin is tested with aluminium foil sag resistance |
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| Publication Number | Publication Date |
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| CN105510149A true CN105510149A (en) | 2016-04-20 |
| CN105510149B CN105510149B (en) | 2018-08-24 |
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| CN201510846278.5A Active CN105510149B (en) | 2015-11-26 | 2015-11-26 | The mold that heat-exchanger fin is tested with aluminium foil sag resistance |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149084A (en) * | 2013-03-11 | 2013-06-12 | 江苏常铝铝业股份有限公司 | Bracket for sag resistance test of aluminum tape |
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2015
- 2015-11-26 CN CN201510846278.5A patent/CN105510149B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149084A (en) * | 2013-03-11 | 2013-06-12 | 江苏常铝铝业股份有限公司 | Bracket for sag resistance test of aluminum tape |
Non-Patent Citations (3)
| Title |
|---|
| 旷落生，王嘉新: "单螺旋钨丝下垂的高温性能研究", 《稀有金属》 * |
| 杨红心: "用V型试验测量灯用钨丝的高温性能", 《中国照明电器》 * |
| 郭让民，等: "钼镧合金板材高温抗载荷弯曲性能研究", 《中国钼业》 * |
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