CN104566305A

CN104566305A - Profile processing technology for manufacturing LED (light emitting diode) street lamp heat dissipation sheet

Info

Publication number: CN104566305A
Application number: CN201310519112.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-29
Filing date: 2013-10-29
Publication date: 2015-04-29

Abstract

The invention relates to a profile processing technology for manufacturing an LED (light emitting diode) street lamp heat dissipation sheet. The LED street lamp heat dissipation sheet is manufactured by carrying out extrusion, stretching, artificial ageing treatment and the like on aluminum alloy AA6063 serving as a raw material. A profile manufactured by the technology disclosed by the invention is high in material density; no bubble or fractured face is produced in a process of processing the heat dissipation sheet, so that conduction of heat dissipation can be enhanced to the maximum extent; the phenomenon that heat concentrated in a certain closed environment cannot be effectively conducted to the outside due to the formation of bubbles or fractured face is avoided.

Description

For making the shape extrusion technology of LED street lamp fin

Technical field

The present invention relates to a kind of shape extrusion technology for making LED street lamp fin.Belong to the production technology field of section bar.

Background technology

LED has the features such as luminous efficiency is high, light fixture reflection loss is low, save the energy, security is high, installation and maintenance are easy, the life-span is long as street lamp, adopt LED street lamp except the cost at single lamp cost and initial installation is than except high-pressure mercury lamp height, laying cost, power consumption cost and be all greatly better than high-pressure mercury lamp in the life-span.But because the brightness requirement of LED street lamp is high, caloric value large, and outdoor environment for use is harsher, and heat radiation is that LED street lamp needs one of key problems-solving, if bad meeting of dispelling the heat directly causes LED quick aging, stability reduces.

For solving the heat dissipation problem of LED street lamp, needing, fin is set usually on lamp body and carrys out distribute heat.But at present for processing the aluminium section bar of fin due to technological reason, make its material closeness less, easily bubble or the plane of disruption is produced in process, thus make heat concentrate in certain environment closed (such as bubble), cause heat effectively cannot be transmitted to the external world, have a strong impact on radiating effect and the service life of LED street lamp.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of section bar processing technology for making LED street lamp fin.The aluminium section bar that this explained hereafter goes out can not produce bubble or the plane of disruption in the process for LED street lamp fin, and the heat that LED street lamp can be made to produce is transmitted to the external world rapidly, effectively, thus ensures stable operation and the service life of LED street lamp.

For solving the problems of the technologies described above, the technical solution used in the present invention is such: for making the shape extrusion technology of LED street lamp fin.It adopts AA6063 aluminium alloy to be raw material, one-body molded through extrusion stretching, comprises the steps: that 1. raw materials prepare: AA6063 aluminium alloy bars is heated to 480 ~ 520 DEG C, is incubated 2 ~ 4 hours, by mold heated to 480 ~ 510 DEG C, be incubated 2 ~ 4 hours; 2. extrude: AA6063 aluminium alloy bars and mould are loaded extruder and extrudes, T5 process is carried out in section bar quenching out, makes section bar be cooled fast to less than 200 DEG C, then puts into cold bed, be cooled to 50 ~ 70 DEG C, check felt bar; 3. stretch: carried out by the section bar obtained stretching, stretcher leveling, restrained stretching deflection, makes stretching indeformable, does not play tangerine peel, 4. scale: carry out scale sawing as requested, detects size by drawing; 5. Ageing Treatment: section bar qualified for dimension control is put into aging furnace and carries out artificial aging, aging temp 180 DEG C ~ 250 DEG C, temperature retention time l ~ 2 hour, go out Air flow after aging furnace, to eliminate the mechanical force after extruding, increase the case hardness of section bar, make its hardness be more than or equal to 8HW.

The above-mentioned shape extrusion technology for making LED street lamp fin, in step 1, mould preferably first through heating after nitrogenize, polishing again.

The aforesaid shape extrusion technology for making LED street lamp fin, in step 3, also needs through CNC processing process, to ensure that the smoothness of section bar inner surface meets the demand of light fixture heat radiation after aluminium section bar stretches.

The aforesaid shape extrusion technology for making LED street lamp fin, the bottom surface of section bar preferably adopts multiple tracks wire drawing process again or polishes with milling machine, makes the flatness of bottom surface reach 0. 03mm ~ 0.Imm.

Compared with prior art, the present invention selects the aluminium of 6063, by the special process of extrusion stretching, increase the material closeness of section bar, bubble or the plane of disruption can not be produced in process, the conduction of heat radiation is promoted to greatest extent, can not because of the formation of bubble or the plane of disruption, heat is concentrated in certain environment closed (such as bubble), causes heat effectively cannot be transmitted to the external world.Use this technique, not only speed can meet the demand of volume production, and also can effectively ensure the reliability made; On the other hand, the aluminium section bar after stretching through CNC processing process, makes its smoothness coefficient about 0.1, ensure that the smoothness of inner surface, well meet the demand of light fixture heat radiation by the present invention; Want the heat absorption capacity fundamentally improved at the bottom of heat sink, just must improve its bottom surface flatness, flatness is weighed by the maximum drop height in surface, and at the bottom of the heat absorption of fin, more smooth thermal resistance is less, is more conducive to heat absorption.The present invention is by adopting multiple tracks wire drawing process to the bottom surface of section bar or polish with milling machine, make the flatness of bottom surface can reach 0. 03mm ~ 0.Imm, can be controlled effectively in the conjugation of LED aluminum base plate and fin, avoid the inequality of being heated making aluminium base because heat radiation contact is bad, cause plate bursting phenomenon.

The AA6063 aluminium alloy selected in the present invention is the heat-treatable strengthened alloy in AL-Mg-Si system with moderate strength, Mg and Si is main alloy element, is widely used in door-window section bar and curtain wall industry.Its chemical analysis is the silicon of 0.2-0.6%, the magnesium of 0.45-0.9% in GB/T5237-93 standard, and the highest limitation of iron is 0.35%, and all the other impurity elements (Cu, Mn, Zr, Cr etc.) are all less than 0.1%.

At present, be metal material substantially for making the material of LED street lamp fin, this is mainly for the consideration of three aspects: the 1. good heat conductivity Zhao of metal material other solid material relatively, and metal has better capacity of heat transmission; 2. metal material is easy to processing, and ductility is good, and high temperature is relatively stable, can adopt various processing technology; 3. metal material easily obtains, although metal also belongs to non-renewable resources, the supply of goods is large, and do not need special procedure, price is relative moderate also.Determine fin material therefor type according to this, the determination of concrete kind equally need as standard.Following table is the coefficient of heat conduction of fin conventional material and common metal material.

In upper table, the unit of the coefficient of heat conduction is W/mK, the heat transfer power that namely sectional area is the temperature difference of the cylinder l rice distance vertically of l square metre when being l Kelvin (1K-l DEG C).The coefficient of heat conduction is more high better naturally, but also needs mechanical performance and the price of taking into account material simultaneously.The gold, silver that the coefficient of heat conduction is very high, cannot extensively adopt because quality is soft, density is excessive and price is too expensive; Iron rule due to pyroconductivity too low, the performance need of high heat density occasion cannot be met, not be suitable for making high-performance fin.The coefficient of heat conduction of copper is equally very high, can, the unfavorable conditions such as density comparatively large, cost slightly high, difficulty of processing large not enough for fear of hardness, uses less in fin.Aluminium as the highest metal of content in the earth's crust, because of the coefficient of heat conduction compared with high, density is little, price is low and favored; But because fine aluminium hardness is less, usually understand the various formula materials of admixture in various application fields and make aluminium alloy, obtain the characteristic not available for many fine aluminiums for this reason, and become fin fabircated shapes.

Detailed description of the invention

Embodiment.Adopt AA6063 aluminium alloy to be raw material, comprise the steps:

A, raw material prepare: after buying aluminium ingot, in founding workshop, melting and alloy homogenising are convenient in raw material segmentation, then verify lumpiness, chemical composition, prepare burden by the smelting trade mark 6063, weigh after determining each component ratio, melting, cast, sawing, obtain AA6063 aluminium alloy bars; AA6063 aluminium alloy bars is heated to 480 ~ 520 DEG C, is incubated 2 ~ 4 hours; Mould is heated to 480 ~ 510 DEG C after nitrogenize, polishing, is incubated 2 ~ 4 hours.Nitrogen treatment significantly can improve the hardness of mould, and its case hardness of mould via nitride process can reach about 70 degree, and the high effect polishing effect brought of hardness is better. the also easier demoulding; B, extruding: AA6063 aluminium alloy bars and mould are loaded 1800T extruder and extrudes, T5 process is carried out in section bar quenching out, makes section bar be cooled fast to less than 200 DEG C, then puts into cold bed, be cooled to 50 ~ 70 DEG C, checks felt bar scratching; C, stretching: the section bar obtained is carried out stretch, stretcher leveling, restrained stretching deflection, makes stretching indeformable, does not play tangerine peel; D, scale: carry out scale sawing as requested, detect size by drawing; E, Ageing Treatment: section bar qualified for dimension control is put into aging furnace and carries out artificial aging, aging temp 180 DEG C ~ 250 DEG C, temperature retention time l ~ 2 hour, section bar goes out Air flow after aging furnace, to eliminate the mechanical force after extruding, increase the case hardness of section bar, make its hardness Wechsler hardness tester measurement be more than or equal to 8HW, meet the hardness that standard GB/T 5237-2004 specifies 6063 aluminium section bars, get product after coming out of the stove.

For ensureing that the smoothness of section bar inner surface and bottom surface meets the demand of light fixture heat radiation, also need after aluminium section bar stretches to control through CNC(computer digital) processing process.The bottom surface of section bar adopts multiple tracks wire drawing process or polishes with milling machine, makes the flatness of bottom surface reach 0.03mm ~ 0.1mm.

Claims

1. one kind for making the shape extrusion technology of LED street lamp fin, it is characterized in that, it adopts AA6063 aluminium alloy to be raw material, comprise the steps: that (1) raw material prepares: AA6063 aluminium alloy bars is heated to 480 ~ 520 DEG C, be incubated 2 ~ 4 hours, by mold heated to 480 ~ 510 DEG C, be incubated 2 ~ 4 hours; (2) extrude: AA6063 aluminium alloy bars and mould are loaded extruder and extrudes, T5 process is carried out in section bar quenching out, makes section bar be cooled fast to less than 200 DEG C, then puts into cold bed, be cooled to 50 ~ 70 DEG C, check felt bar; (3) stretch: carried out by the section bar obtained stretching, stretcher leveling, restrained stretching deflection, makes stretching indeformable, does not play tangerine peel; (4) scale: carry out scale sawing as requested, detects size by drawing; (5) Ageing Treatment: section bar qualified for dimension control is put into aging furnace and carries out artificial aging, aging temp 180 DEG C ~ 250 DEG C, temperature retention time l ~ 2 hour, go out Air flow after aging furnace, to eliminate the mechanical force after extruding, increase the case hardness of section bar, make its hardness be more than or equal to 8HW; The bottom surface of section bar adopts multiple tracks wire drawing process or polishes with milling machine, makes the flatness of bottom surface reach 0.03mm ~ 0.1mm.

2. the shape extrusion technology for making LED street lamp fin according to claim l, it is characterized in that, in step (1), mould needs before heating through nitrogenize, polishing.

3. the shape extrusion technology for making LED street lamp fin according to claim l, it is characterized in that: in step (3), also need through CNC processing process after aluminium section bar stretches, to ensure that the smoothness of section bar inner surface meets the demand of light fixture heat radiation.