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1 The performance of "adsorbent particles" and its impact on product quality More and more methods of aluminum surface treatment, in addition to the general oxidation profile, electrophoresis profiles, spray profiles, fluorocarbon spray profiles, wood grain paint profiles, etc. have appeared one after another. There are many tricks. The defects of “adsorbent particles†have little effect on general oxidized materials, but they have a greater impact on other forms of treatment, mainly impeding the appearance of these profiles. In extrusion production, the extruded profile "adsorbent particles" can be found after careful observation or by hand sliding on the surface of the profile. In the sawing and packaging process, most of the small particles can be removed by blowing or wiping. However, some of them are still adsorbed on the surface of the profile due to static electricity. After aging treatment, these particles adhere more closely to the surface of the profile. In the pretreatment process of the profile surface, some of the pits can be removed due to the influence of the concentration of the bath solution, but small pits are formed on the surface of the profile, and some of them are not removed, so that the protrusions are formed. This problem often occurs in the production of electrophoretic and spray profiles.
2 Reasons for formation of "adsorbent particles"
2.1 Influence of the mold In the extrusion production, the mold is working under high temperature and high pressure, and the mold is elastically deformed under the influence of pressure and temperature. The working belt of the mold starts from parallel to the extrusion direction, and after the pressure is applied, the working belt is deformed into a trumpet shape. Only the edge portion of the working belt contacts the aluminum stick formed by the profile and is similar to the cutting edge of the turning tool. In the formation of sticky aluminum, particles are constantly being carried out by the profile and adhere to the surface of the profile, resulting in "adsorbent particles". With the continuous increase of sticky aluminum, the mold will instantly rebound and bite marks will be formed. If the sticky aluminum deposits are too large to be pulled out of the profile, the sticky aluminum does not fall off when the mold instantly rebounds, and the problem arises that the surface of the profile is rough, bright, tearing of the profile, mold blockage, etc., the sticking aluminum phenomenon of the mold is shown in FIG. 1. The extrusion die we use now is basically a plane die. In the case where the casting bar is not stripped, the surface of the casting bar and the impurities in it are accumulated in the dead zone of the metal flow in the die, with the extrusion and extrusion of the extrusion bar. With the increase in the number of roots, the impurities in the dead zone are constantly changing, and some of them are carried by the normal flowing metal and accumulate in the deformed space of the working belt. Some were pulled off the profile and formed "adsorbent particles." Therefore, the mold is the key factor causing the "adsorption particles".
3 Measures to reduce "adsorption particles"
3.1 Mold design, manufacturing, use should pay attention to the problem
(1) The design of the mold must meet the calculation requirements for stiffness and strength in order to reduce the amount of elastic deformation of the mold during compression. When determining the working belt, the length of the working belt, the form of the air knife, the neck of the mold, and the form of the welding chamber must all take into consideration the optimal value of the parameter selection. The selection of factors such as the diversion hole and diverter hole of the die should be selected as large as possible within the allowable range to achieve the purpose of reducing the pressure.
(2) During the manufacturing process of the mold, it is necessary to reduce manufacturing errors and avoid the presence of sharp corners. Smooth transitions should be made to the frictional surface of the metal flow, and the bumpy transition area should be minimized. Ensure the consistency of die hole size deviation.
(3) When using the mold, be sure to install and use the proper mold pad and support pad.
(4) The mold must be nitrided before it can be applied to reduce the sticky aluminum problem.
(5) When repairing a mold or a light mold, pay attention to the parallelism and surface roughness of the work belt and the matching dimensions of the assembly mold assembly, and tighten the bolts.
3.2 Selecting the appropriate extrusion parameters According to the extrusion coefficient, section profile, mold conditions, equipment conditions, etc., select the best extrusion temperature, casting rod heating temperature, mold temperature and extrusion speed, and in the production process , Constantly adjust these parameters. These are the main measures to eliminate or reduce "adsorbent particles".
3.3 Improving the quality of cast rods In the casting process of cast rods, refinement of the grain process is adopted, and effective technical measures are taken to reduce the defects such as slag inclusion, looseness and coarse grains of the cast rods, and the cast rods are homogenized. , are effective measures to reduce and eliminate "adsorbent particles". In addition, to strengthen the low-strength tissue analysis of cast rods, conduct quality monitoring, and reduce the use of defective cast rods, it is also an effective means to reduce and eliminate “adsorbent particlesâ€.
4 Conclusion
The main factors affecting the “adsorption particles†are mold, cast rod, and extrusion process. The operation level of the operators is also reflected in these three elements. Based on the production practice, it is necessary to continuously analyze the problems and summarize the experience to reduce or avoid “adsorbing particlesâ€, sticky aluminum, rough surface, scratches, and profiles. Tear and other defects, greatly improving the yield and production efficiency of the profile.
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Causes and Preventive Methods of Surface Roughness Defects in Extruded Aluminum Profiles
In the extrusion production of aluminum profiles, the common defects are relatively intuitive, such as bending, twisting, deformation, slag inclusions and so on. The "adsorbent particle" defects are not easily observed or hard to find. The harm is: in the electrophoresis, spray profile production process, it is difficult to remove, affect the appearance of the appearance of the profile, resulting in waste. Therefore, we must constantly observe and analyze in the extrusion production practice, summarize its causes, and take timely measures to reduce or eliminate the occurrence of such defects.