CN107366839A - Avoid manufacture and the installation method of magnesium alloy LED light box thermal expansion influence - Google Patents
Avoid manufacture and the installation method of magnesium alloy LED light box thermal expansion influence Download PDFInfo
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- CN107366839A CN107366839A CN201710614179.3A CN201710614179A CN107366839A CN 107366839 A CN107366839 A CN 107366839A CN 201710614179 A CN201710614179 A CN 201710614179A CN 107366839 A CN107366839 A CN 107366839A
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- Prior art keywords
- casing
- magnesium alloy
- installation
- thermal expansion
- led light
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/90—Methods of manufacture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
The invention discloses a kind of manufacture for avoiding magnesium alloy LED light box thermal expansion influence and installation method, comprise the following steps：(1) by theory analysis and calculating, all kinds of magnesium alloy casing installation gaps are primarily determined that；(2) heating test is carried out to magnesium alloy casing, it is determined that swell increment measured value before and after heating；(3) it is counter to push away cabinet design size according to result of calculation；(4) partition mode installation casing is utilized, ensures installation gap；The partition uses thickness as 0.65mm, width is that 20mm mild steel is manufactured into L shape, face length is 50mm, portion of the handle suitably thickeies, the installation gap includes swell value and electrophoretic coating thickness value, the α represents linear expansion coefficient, and magnesium is at 0~100 DEG C, linear expansion coefficient α=0.260 × 10‑4/ DEG C, iron is at 10 DEG C~80 DEG C, linear expansion coefficient α=0.117 × 10‑4/℃；The L represents the installation length of casing or the size of single casing.The present invention can be reduced effectively due to breakdown loss caused by thermal expansion.
Description
Technical field：
The present invention relates to a kind of manufacture of thermal expansion influence and installation method, and magnesium alloy LED is avoided more particularly to one kind
The manufacture of lamp box thermal expansion influence and installation method.
Background technology：
It is general that installation, casing work are combined using slitless connection mode when magnesium alloy box body combinations are arranged on steel skeleton
Shi Shoure, environment temperature are superimposed with operating temperature, and actual measurement tank surface temperature reaches 80 DEG C, according to outfield feedback of the information, magnesium alloy
LED types light box deforms during work after the combination installation of outfield, dislocation is produced when serious, or even cause lamp bead base
Plate damages, and light emitting diode (LED) is a kind of solid state device that electric energy can be converted into luminous energy, and its structure is mainly by PN junction core
The systems such as piece, electrode and optics form.LED basic functional principle is the process of an electro-optic conversion, in transfer process, electricity
Heat energy release, especially large-power LED light bead can be converted into, because its power is higher, about more than 60% electric energy will become
Heat energy, thermal stress makes casing dilatancy, and thermal expansion and shrinkage factor of the ferrous materials skeleton from magnesium alloy materials casing are different,
Steel skeleton constrains casing free wxpansion and contraction, and thermal stress makes casing most weakness deformed damaged, or even cracks, chip off-falling.
The content of the invention：
The technical problems to be solved by the invention are：Overcome the deficiencies in the prior art, there is provided one kind can be reduced effectively
Due to the manufacture and the installation method that avoid magnesium alloy LED light box thermal expansion influence of breakdown loss caused by thermal expansion.
It is of the invention to be for the technical solution adopted for solving the technical problem：
A kind of manufacture for avoiding magnesium alloy LED light box thermal expansion influence and installation method, comprise the following steps：
(1) by theory analysis and calculating, all kinds of magnesium alloy casing installation gaps are primarily determined that：Utilize magnesium alloy box body wire
Property swell increment formula：ΔLMagnesium=α × 80 × L and steel skeleton linear expansion amount formula：
ΔLIron=α × 80 × L calculates theoretical swell value of the magnesium alloy casing on the steel skeleton, so as to primarily determine that
Installation gap of all kinds of magnesium alloy casings on steel skeleton；
(2) heating test is carried out to magnesium alloy casing, it is determined that swell increment measured value before and after heating：Take magnesium alloy casing one
Part, first determine box shape size three times under the conditions of 32 DEG C of workshop room temperature, take its average value, casing is then put into baking oven liter
Temperature is incubated 30 minutes, its size is measured after taking-up, takes its average value to 80 DEG C, so that it is determined that actual all kinds of magnesium alloy casings exist
Installation gap on steel skeleton；
(3) it is counter to push away cabinet design size according to result of calculation：According to magnesium alloy original design drawing contour dimension, will expand
Value is converted into preset clearance, and Curve guide impeller size, nominal size is constant, and mark is two-way to subtract tolerance so that box parts are actual to be added
Chinese musical scale cun meets assembling expansion principle；
(4) partition mode installation casing is utilized, ensures installation gap：Casing after improvement is combined installation in outfield
When, the contact surface up and down of casing is separated using partition to be installed, and treats that casing installation folder is next, extracts dividing plate out.
The partition uses thickness as 0.65mm, and width is that 20mm mild steel is manufactured into L shape, and face length is
50mm, portion of the handle suitably thicken.
The installation gap includes swell value and electrophoretic coating thickness value.
The α represents linear expansion coefficient, and magnesium is at 0~100 DEG C, linear expansion coefficient α=0.260 × 10-4/ DEG C, iron is -10
DEG C~80 DEG C when, linear expansion coefficient α=0.117 × 10-4/℃；The L represents the installation length of casing or the chi of single casing
It is very little.
The present invention positive beneficial effect be：
The present invention installs phenomenon of the failure according to erecting bed box body combinations, and preset clearance is proved using theoretical calculation, counter to push away
Design size, the manufacturing process and mounting process of casing are improved, efficiently solve event caused by magnesium alloy casing expanded by heating
Barrier loss, improves box body combinations and installs and uses efficiency.
Embodiment：
With reference to specific embodiment, the present invention will be further explained：
Embodiment：A kind of manufacture for avoiding magnesium alloy LED light box thermal expansion influence and installation method, comprise the following steps：
(1) by theory analysis and calculating, all kinds of magnesium alloy casing installation gaps are primarily determined that：Utilize magnesium alloy box body wire
Property swell increment formula：ΔLMagnesium=α × 80 × L and steel skeleton linear expansion amount formula：
ΔLIron=α × 80 × L calculates theoretical swell value of the magnesium alloy casing on the steel skeleton, so as to primarily determine that
Installation gap of all kinds of magnesium alloy casings on steel skeleton.
Because magnesium alloy materials are different from the thermal coefficient of expansion of ferrous materials, when operating temperature reaches 80 DEG C, magnesium alloy
The swell increment of box body combinations installation is calculated as follows：
Magnesium is at 0~100 DEG C, linear expansion coefficient α=0.260 × 10-4/ DEG C, by taking 500mm × 500mm casings as an example, if outside
Transverse combination assembles 20 casings, is seamlessly connected, and now total length is 10m, according to 0 DEG C of processing temperature in the winter room of workshop,
The 80 DEG C of calculating of casing summer operating temperature, the linear swell increment of casing：
ΔLMagnesium=α × 80 × L
=(0.260 × 10-4/℃)×80℃×10000mm
=20.8mm
Iron is at -10 DEG C~80 DEG C, linear expansion coefficient α=0.117 × 10-4/ DEG C, with steel skeleton 10m length, 80 DEG C of temperature
Calculate, steel skeleton linear expansion amount：
ΔLIron=α × 80 × L
=(0.117 × 10-4/℃)×80℃×10000mm
=9.36mm
Magnesium alloy casing swell increment Δ LMagnesiumWith steel skeleton linear expansion amount Δ LIronDifference：
ΔLMagnesium-ΔLIron=20.8-9.36=11.44mm
The single linear swell increment of casing is calculated (according to 0 DEG C of processing temperature in the winter room of workshop, casing summer operating temperature 80
DEG C calculate)：
ΔLMagnesium list=α × 80 × L
=(0.260 × 10-4/℃)×80℃×500mm
=1.04mm
The single linear swell increment of casing is calculated (according to 32 DEG C of processing temperature in the winter room of workshop, casing summer operating temperature
80 DEG C of calculating):
ΔLMagnesium list=α × 48 × L
=(0.260 × 10-4/℃)×48℃×500mm
=0.624mm
(2) heating test is carried out to magnesium alloy casing, it is determined that swell increment measured value before and after heating：Take magnesium alloy casing one
Part, first determine box shape size three times under the conditions of 32 DEG C of workshop room temperature, take its average value, average value is respectively：499.20、
499.27；Casing is then put into baking oven and is warming up to 80 DEG C, 30 minutes is incubated, its size is measured after taking-up, takes its average value, is put down
Average is respectively：499.91、499.96.
Two groups of data before and after heating are averaged respectively, average value is at 32 DEG C：499.235；Average value is at 80 DEG C：
499.935。
The difference of the linear swell increment actual measurement average value of single casing is：
499.935-499.235=0.70mm
Experiment measured value is slightly larger than calculated value.
Under 80 DEG C of operating temperature, if box body combinations install slitless connection, 20 box body combinations will have 11.44mm
Swell increment can not discharge, due to cast magnesium alloy unit area tensile strength sigmab≤21(kg/mm2), far smaller than general structure
Steel unit area tensile strength sigmab≥42(kg/mm2), temperature distortion after magnesium alloy box body combinations, damage first.
(3) it is counter to push away cabinet design size according to result of calculation：According to magnesium alloy original design drawing contour dimension, will expand
Value is converted into preset clearance, and Curve guide impeller size, nominal size is constant, and mark is two-way to subtract tolerance so that box parts are actual to be added
Chinese musical scale cun meets assembling expansion principle.
According to box body combinations installation situation, it is necessary between 4 contact surfaces in the upper and lower, left and right direction of single casing are reserved
Gap, ensure that the swell increment after casing expanded by heating there are enough extending spaces, according to magnesium alloy box body combinations swell increment Δ LMagnesium=
20.8mm, calculate single casing swell increment：
ΔLMagnesium list=20.8/20=1.04mm
And swell increment of the steel skeleton in 500mm length is：
ΔLSteel list=9.36/20=0.468mm
The preset clearance when difference of single magnesium alloy casing and 500 mm length steel skeleton swell incremenies is installs：
ΔLGap=Δ LMagnesium list-ΔLSteel list
=1.04-0.468
=0.572mm
I.e.：The double-faced clearance of casing installation should be not less than 0.572mm.
This casing gabarit design size is：500mm × 500mm, and to leave protective coating thickness 10~16 micro- for surface treatment
Rice (one side), two-sided is 20~32 microns, also must consider the thickness of electrophoretic coating in the lump while gap is considered
Enter, so, two-sided maximal clearance is：
0.572+0.032=0.604mm
By the former contour dimension of casing be changed to it is two-way subtract deviation, nominal size is constant, and the casing contour dimension after improvement is
500mm, the upper deviation are -0.604mm, and lower deviation is -0.704mm, manufacturing tolerance 0.10mm.
(4) partition mode installation casing is utilized, ensures installation gap：Casing after improvement is combined installation in outfield
When, the contact surface up and down of casing is separated using partition to be installed, and treats that casing installation folder is next, extracts dividing plate out.
Partition uses thickness as 0.65mm, and width is that 20mm mild steel is manufactured into L shape, face length 50mm,
Portion of the handle suitably thickeies.
Installation gap includes swell value and electrophoretic coating thickness value.
α represents linear expansion coefficient, and magnesium is at 0~100 DEG C, linear expansion coefficient α=0.260 × 10-4/ DEG C, iron -10 DEG C~
At 80 DEG C, linear expansion coefficient α=0.117 × 10-4/℃；L represents the installation length of casing or the size of single casing.
During work, according to former design drawing contour dimension, swell increment is converted into preset clearance, Curve guide impeller size, name
Adopted size constancy, mark is two-way to subtract tolerance, and separates installation using up and down contact surface of the partition in casing, treats that casing is installed
After clamping, dividing plate is extracted out so that box parts actual processing size meets assembling expansion principle.
It is described above, only it is the preferred embodiments of the present invention, any formal limitation is not made to the present invention, it is all
It is any simple modification, equivalent change and modification made according to the technical spirit of the present invention to above example, still falls within
In the protection domain of technical solution of the present invention.
Claims (4)
1. a kind of manufacture for avoiding magnesium alloy LED light box thermal expansion influence and installation method, it is characterised in that including following step
Suddenly：
(1) by theory analysis and calculating, all kinds of magnesium alloy casing installation gaps are primarily determined that：It is linearly swollen using magnesium alloy casing
Bulk formula：ΔLMagnesium=α × 80 × L and steel skeleton linear expansion amount formula：ΔLIron=α × 80 × L calculates magnesium alloy case
Body is arranged on the theoretical swell value on steel skeleton, so as to primarily determine that installation gap of all kinds of magnesium alloy casings on steel skeleton；
(2) heating test is carried out to magnesium alloy casing, it is determined that swell increment measured value before and after heating：Magnesium alloy casing one is taken, first
Box shape size is determined under the conditions of 32 DEG C of workshop room temperature three times, takes its average value, casing then is put into baking oven is warming up to
80 DEG C, 30 minutes are incubated, its size is measured after taking-up, takes its average value, so that it is determined that actual all kinds of magnesium alloy casings are in reinforcing bar
Installation gap on frame；
(3) it is counter to push away cabinet design size according to result of calculation：According to magnesium alloy original design drawing contour dimension, swell value is turned
Preset clearance is turned to, Curve guide impeller size, nominal size is constant, and mark is two-way to subtract tolerance so that box parts actual processing chi
It is very little to meet assembling expansion principle；
(4) partition mode installation casing is utilized, ensures installation gap：When casing after improvement is combined installation in outfield, case
The contact surface up and down of body is separated using partition to be installed, and treats that casing installation folder is next, extracts dividing plate out.
2. the manufacture according to claim 1 for avoiding magnesium alloy LED light box thermal expansion influence and installation method, its feature
It is：The partition uses thickness as 0.65mm, and width is that 20mm mild steel is manufactured into L shape, face length 50mm, hand
Hold the appropriate thickening in part.
3. the manufacture according to claim 1 for avoiding magnesium alloy LED light box thermal expansion influence and installation method, its feature
It is：The installation gap includes swell value and electrophoretic coating thickness value.
4. the manufacture according to claim 1 for avoiding magnesium alloy LED light box thermal expansion influence and installation method, its feature
It is：The α represents linear expansion coefficient, and magnesium is at 0~100 DEG C, linear expansion coefficient α=0.260 × 10-4/ DEG C, iron -10 DEG C~
At 80 DEG C, linear expansion coefficient α=0.117 × 10-4/℃；The L represents the installation length of casing or the size of single casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710614179.3A CN107366839B (en) | 2017-07-25 | 2017-07-25 | Manufacturing and mounting method for avoiding influence of thermal expansion of magnesium alloy LED lamp box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710614179.3A CN107366839B (en) | 2017-07-25 | 2017-07-25 | Manufacturing and mounting method for avoiding influence of thermal expansion of magnesium alloy LED lamp box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107366839A true CN107366839A (en) | 2017-11-21 |
| CN107366839B CN107366839B (en) | 2020-05-22 |
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|---|---|---|---|
| CN201710614179.3A Active CN107366839B (en) | 2017-07-25 | 2017-07-25 | Manufacturing and mounting method for avoiding influence of thermal expansion of magnesium alloy LED lamp box |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08273421A (en) * | 1995-03-31 | 1996-10-18 | Tec Corp | Shade body for luminaire |
| CN101688997A (en) * | 2007-07-03 | 2010-03-31 | 3M创新有限公司 | Backlight assembly with transmission optics film |
| CN104235700A (en) * | 2014-09-29 | 2014-12-24 | 南京中电熊猫液晶显示科技有限公司 | LED backlight module |
| CN204080214U (en) * | 2014-05-09 | 2015-01-07 | 上海铁美机械有限公司 | A kind of chemical fiber winding device roller incubator |
-
2017
- 2017-07-25 CN CN201710614179.3A patent/CN107366839B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08273421A (en) * | 1995-03-31 | 1996-10-18 | Tec Corp | Shade body for luminaire |
| CN101688997A (en) * | 2007-07-03 | 2010-03-31 | 3M创新有限公司 | Backlight assembly with transmission optics film |
| CN204080214U (en) * | 2014-05-09 | 2015-01-07 | 上海铁美机械有限公司 | A kind of chemical fiber winding device roller incubator |
| CN104235700A (en) * | 2014-09-29 | 2014-12-24 | 南京中电熊猫液晶显示科技有限公司 | LED backlight module |
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|---|---|
| CN107366839B (en) | 2020-05-22 |
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