Four points for attention in the post-treatment process of aluminum profile oxidation:

(1) Hot water flushing. The purpose of hot water washing is to age the film. However, the water temperature and time should be strictly controlled. If the water temperature is too high, the film will become thinner and the color will fade. The similar problems mentioned above will also occur when the industrial aluminum profile is treated for too long. The suitable temperature and time are: temperature 40 ~ 50℃ for 0.5 ~ 1 min.

(2) drying. It is better to dry naturally, and the workpiece filled with hot water is hung on the shelf obliquely, so that the free water on the working surface flows downwards in a straight direction. The water drops flowing to the corner of the lower end are sucked with a towel, and the color of the film dried by this method is not affected, which is natural.

(3) aging. The aging method of aluminum profiles can be determined according to climatic conditions. It can be exposed to sunlight in summer with sunshine and baked in an oven in rainy days or winter. The technological conditions are: temperature 40 ~ 50℃ for 10 ~ 15 min.

(4) Repair of nonconforming parts. Unqualified conductive oxide films should be picked out before drying and aging, because it is difficult to remove the film after drying and aging and will affect the roughness of the workpiece surface. The author has made some technical explorations on this problem, and through various method tests, it is found that the following methods are effective, simple and do not affect the surface quality of the workpiece. The specific process is as follows. First, the unqualified workpiece is clamped on the fixture for aluminum anodizing, and then the aluminum is anodized in sulfuric acid solution for 2 ~ 3min. When the film is soft and falls off, it can be anodized again after being slightly cleaned by alkali solution and exposed by nitric acid.

Future development trend of aluminum profiles

Aluminum profile production enterprises generally realize that it is increasingly difficult for industrial aluminum profiles to survive, develop and grow according to traditional production technology and profit points of enterprises. After more than 20 years of development, a large number of on-site technicians and industrial workers have been trained in the field of building profile production, and rich practical experience has been accumulated. But at present, the technical added value of products is still relatively low. In order to improve the product competitiveness of building materials, we must break through the existing technical bottleneck, and start from the aspects of new product development, improving production efficiency and strengthening process technology control and improvement, so as to improve the core competitiveness of enterprises and products.

Improve the melt quality of aluminum bars: Some aluminum production enterprises often account for about 50% of the product quality problems in the extrusion production process due to insufficient attention to the quality of molten cast products. Combined with the soaking effect, the influence on extrusion speed accounts for about 70%. It is observed that the process control in the melting and casting workshop of most aluminum profile manufacturers is not ideal, and the refining effect of the melt is poor, so the problem of "how to prevent the secondary pollution of the melt after the furnace" has not been paid enough attention.

Improve the design, processing and manufacturing level of dies: At present, most manufacturers of building aluminum profiles in China use single-hole die extrusion, and the application of porous dies is limited to the production of small-section profiles by small-tonnage extruders. For ordinary building profile products, the output of a single section is usually large, and there are many batches. Therefore, the conditions for adopting porous die extrusion are met, which requires the innovative consciousness of die designers, processing equipment and accuracy to reach a new level, thus improving the efficiency of extrusion production. In this respect, there is a big gap between us and our European and American counterparts.

Adopt advanced extrusion technology: At present, individual manufacturers of industrial aluminum profiles adopt this method, which has achieved good results and significantly improved the output of single extrusion machine. Bright Lo, a die expert, believes that on the basis of optimizing die design, improving die material performance and surface treatment effect, the purpose of "low-temperature rapid extrusion" can be achieved by using high-quality aluminum bars after soaking and heating quickly, and the bar temperature can be controlled in a relatively low temperature range under the condition that the extrusion outlet temperature is above 500℃.

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