The mechanical properties (such as yield strength, elongation) and coating properties (such as pencil hardness, T-bend value, impact energy) of color-coated sheets usually change with the increase of storage time, which affects the processing and forming, so it is generally recommended Process and use within 1 year.
In order to avoid excessive deformation in one forming and destroying the adhesion of the coating, parts with complex shapes should be formed in multiple passes to reduce the amount of deformation in a single pass. Reasonable processing speed and appropriate clearance should be set according to equipment conditions, process conditions, part shape and other factors, and the thickness of the coating should be considered when setting the clearance; if the temperature is too low, the coating flexibility of the color-coated sheet will be affected, and low-temperature processing should be avoided. .
Most coatings can be used as lubricants to meet the lubrication requirements of most forming processes. If the lubricity of the coatings is insufficient, the lubricity can be improved by applying oil, waxing, and covering with a peelable protective film. However, it should be noted that wet lubricants are easy to absorb dirt and should be removed before installation. The peelable protective film should also be removed as soon as possible after processing.
Pay attention to ensure the cleanliness and integrity of the processing equipment. In order to avoid damage to the coating, the cutting metal particles generated during processing should be cleaned in time; the wear on the surface of the forming roll and the mold should be reduced; the scissors for shearing should be sharp, and the cutting edge should be sharp There must be no burrs.
Machining fractures and incision surfaces are prone to corrosion, so burrs should be minimized when cutting or punching, and incisions, openings, etc. should be designed in hidden places as much as possible during processing, or protective coatings, caulking strips, etc. are used to process the edges. Take protective measures.
Check the color and surface quality of the color-coated coils before installation. If the coating of the color-coated board has been damaged in the early processing, please use it with caution. During the installation process, it is necessary to avoid dragging, scraping, scratching and scalding the coating to prevent bending and denting. When walking on color-coated parts, you should wear shoes with smooth and soft soles, and there should be no small stones, metal chips and other debris on the soles. The parts are dented and deformed.
When using fasteners such as bolts and rivets to connect the color-coated parts, it should be ensured that the corrosion resistance of the fasteners matches that of the color-coated panels, so as to avoid premature corrosion of the fasteners and become a source of accelerated corrosion; Considering the potential difference between the fastener material and the color-coated plate to avoid electrochemical corrosion, it is recommended to use galvanized or aluminum fasteners. Carefully select and use installation tools to avoid scratching the color-coated panels. Reasonably design the tightening position, and the tightening degree should be moderate when the bolts are fixed, so as to avoid too loose or too tight, resulting in the deformation of the color-coated plate.
When using chemical products such as adhesives and sealants to process color-coated boards, pay attention to the acidity and alkalinity of chemical products. Neutral chemical products should be used to avoid acid and alkali substances corroding the coating and affecting the use of color-coated boards. life.
Pay attention to the installation angle and position of the color-coated board parts. Long-term water retention will reduce the adhesion of the coating. Therefore, the design and installation should ensure that the water can be drained in time to avoid water accumulation. Copper, lead, graphite and unprotected steel plates shall not be used in direct contact with color-coated boards, nor shall logs, untreated wood, wet cement, etc. be used in direct contact with color-coated boards. Or the coating reacts and reduces the service life of the color-coated board.