There is a batch of stainless steel signs to be produced, the largest size is 6mX1.2m, the total area is 36m2, the corrosion depth is about 0.6mm, the corrosion part can not be too bright, contrast with the base plate, with a certain metal texture and artistic sense. Metal signage is usually produced by photographic etching or screen printing, but it is difficult for large or deeply corroded workpieces. Especially for the production and exposure of the substrate, it is difficult to make it at one time. Therefore, the chemical milling process commonly used in the aerospace industry is thought out. Because the two principles are similar, the workpiece is processed by chemical etching solution to obtain the desired shape and size. I have used the chemical milling process to make aluminum signs, but the size is far less than that. Such a large sign is the first production.
1Production Process 1.1 Process Flow Out of the Moon ※Coating Protective Coatings ※Vulcanization-Repairing ※Printing Corrosion Cutting Edges ※Cleaning ※Filling ※Mask varnish ※Packing 1.2 Process conditions and description Degreasing is mainly to remove oil and rust preventive oil from the surface of the workpiece . For more fats and oils, first remove the oil with an organic solvent and then chemically remove the oil.
Direct solvent removal for oil with high surface finish and low oil stain. Whether the grease is removed or not directly affects the bonding force between the protective coating and the substrate bottom layer. If the bonding force is not good, the protective coating will fall off during the corrosion process, and eventually the text pattern and the like may be deformed or even unclear.
The protective coating is the same as the photoresist, and the protective coating serves as a protective agent. Since the corrosion depth is deeper than that of ordinary signs, the selected protective coating should have good adhesion to the substrate and the coating has high strength and elongation. In the construction must control the thickness of the coating, generally 0.2 ~ 0.3mm, too thick is not conducive to later engraving; too thin to protect.
The preferred method is to calculate the amount of paint according to the area of ​​the workpiece and the solid content of the coating. It is not allowed to have more coating or less coating, and the coating has no serious sag, no particles and bubbles.
Vulcanization gives sufficient strength and bonding strength to the coating by vulcanization, which is also the basic condition for ensuring processing accuracy and requirements. If the room temperature curing type coating is used, it can be placed for a predetermined period of time.
After repairing the vulcanization, the surface quality of the coating is inspected, and the damage caused during the operation and the particles, bubbles and inclusions which affect the performance are repaired. The vulcanized coating is also required to be partially vulcanized with hot air (ie, a hair dryer).
Because the sign is carried out in both the depth and the width direction during the corrosion process, the ratio of the width to the depth is generally between 0.8 and 1.1, and the process conditions are different and the materials are different. For workpieces with a machining depth of more than 0.3 mm, this factor must be considered in advance. Otherwise, the signage is significantly different from the original requirements. For the concave word sign, the text line surface technology bookmark3 and the pattern shape are scaled down according to the corrosion depth, while the convex word sign is reversed, correspondingly expanding the outline of the line figure.
(6) The shape of the protective coating with the text and the pattern is etched through the scalpel. Pay attention to the strength of the knife, so as to infiltrate the coating and damage the substrate and remove the protective coating of the corroded part.
Cut the excess portion of the sign as required.
Clean and carefully remove the protective coating, and have a good effect on the appearance (upper page 63), good protection, no rust.
92 metal-coated steel products hot-dip galvanized layer technical requirements, bending test of the sample adhesion, adhesion strength meets the requirements.
5 Application of hot-dip galvanizing process In 1999, the surface treatment of a certain engineering frame was subjected to hot-dip galvanizing process, and 100 sets of frame surface coating were completed. After hot-dip galvanizing, all parts were silver-white and uniform in color. During the assembly process, the coating was hammered and the coating was not peeled off. The product was cleaned in corrosion products in Fujian, Guangdong, Guangxi, Guizhou.
Filling If you need to highlight the text pattern with color, etc., fill it with paint as required.
After the varnish is completed, the varnish is generally covered with a urethane varnish.
2 Results 2.1 Corrosion Depth Except for the first piece due to lack of experience, the corrosion depth deviation of the process parameters is slightly better, and the corrosion depth of other signs is relatively average, between 0.56~0.
2.2 Effect Because the corrosion size is reserved, the size of the label is appropriate, the line is smooth, the artistic feeling of the corroded surface is strong, and the contrast contrast with the base material is large, achieving satisfactory results.
3 Conclusion It is feasible to make large-scale metal signs by chemical milling process. As long as the process plan and process parameters in the reasonable design and implementation process can achieve satisfactory results, the application of aerospace technology is also expanded. Sichuan, Xinjiang, Qinghai, Gansu and other places. In the tracking of products in coastal areas, the surface of hot-dip galvanized parts has no rust, and users respond well to hot-dip galvanized parts.
After the hot-dip galvanizing of the steel structural parts used in the mount, the surface is not recoated. This reduces the cost of the product and increases the surface treatment capacity of the steel structural parts in mass production.
In order to realize the industrialization of small communication antennas, new methods must be adopted. In order to fully realize the requirements of mass production, a lot of research work must be done to improve the structural design and enhance the processability of mass production.
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