1 Processing is an important part influencing the quality of color-coated sheets. In order to ensure product quality, some precautions during processing are briefly introduced below. For specific processing requirements, refer to relevant materials or consult experts.
2 Because the color coated plate has a coating on its surface, there are many different places in the processing compared with the common cold rolled plate and plated plate. The main difference is that the forming process must be performed under the premise of ensuring the integrity of the coating. Processing precautions are as follows:
a) Mechanical properties (such as yield strength, tensile strength, and elongation) are important indexes for measuring forming, are important parameters for determining and adjusting the processing process, and are one of the main factors considered during processing.
b) Coating properties (such as pencil hardness, T-bend, impact energy) are closely related to processability and are another major factor considered during processing.
c) Some of the mechanical properties (such as yield strength and elongation) and part of the coating properties (such as pencil hardness, T-bend, and impact energy) of the color coated plate will usually change with the storage time, resulting in the formation of processing Impact should be given enough attention.
d) When the shape of the part is complex and the degree of deformation is large, multiple passes should be used. If formed once, the adhesion of the coating may be damaged due to excessive deformation.
e) During machining, appropriate gaps should be set according to factors such as the shape of the die, deformation characteristics, and process conditions. The thickness of the coating should be considered when setting the gap.
f) Most coatings can be used as solid lubricants and can meet the lubrication requirements of most forming processes. Some coatings can adjust the formula to improve the lubricity of the coating. If the lubricity of the coating is insufficient, the lubricity can be improved by oil coating, wax coating, peelable protective film and the like. However, it should be noted that the wetting agent solvent is easy to absorb dirt and should be removed before installation. The peelable protective film should also be removed as soon as possible after the end of processing.
g) Reasonable processing speed should be set according to equipment conditions, process conditions, part shape and other factors. If the deformation speed is too high, the coating will peel off easily. At low temperatures, the coating's flexibility decreases, so low-temperature processing should be avoided. If the ambient temperature is low, the material should be preheated to a certain temperature before processing.
h) The section of the cut produced during processing is prone to corrosion. Therefore, necessary protective measures should be taken, such as protective coatings, seals, etc.
i) The burrs on the cut surface shall be minimized during processing to prevent burrs from scratching the surface.
j) All surfaces in contact with the coating shall be kept clean and tidy, and chips and metal particles generated during processing shall be cleaned in a timely manner to prevent foreign matter from damaging the coating surface.
k) During the processing, the wear of the roller surface of the forming roller or the surface of the die should be minimized, the contact surface should be kept clean, and defects such as indentation and scratching on the surface of the coating should be prevented.
l) As far as possible, the factory should be pre-assembled and then sent to the site for installation. Protective measures should be taken during installation to prevent damage to the coating.
m) When the coating surface is found to be damaged during processing, a special repair coating should be used for repair in time to prevent corrosion at the damaged part.
2 Because the color coated plate has a coating on its surface, there are many different places in the processing compared with the common cold rolled plate and plated plate. The main difference is that the forming process must be performed under the premise of ensuring the integrity of the coating. Processing precautions are as follows:
a) Mechanical properties (such as yield strength, tensile strength, and elongation) are important indexes for measuring forming, are important parameters for determining and adjusting the processing process, and are one of the main factors considered during processing.
b) Coating properties (such as pencil hardness, T-bend, impact energy) are closely related to processability and are another major factor considered during processing.
c) Some of the mechanical properties (such as yield strength and elongation) and part of the coating properties (such as pencil hardness, T-bend, and impact energy) of the color coated plate will usually change with the storage time, resulting in the formation of processing Impact should be given enough attention.
d) When the shape of the part is complex and the degree of deformation is large, multiple passes should be used. If formed once, the adhesion of the coating may be damaged due to excessive deformation.
e) During machining, appropriate gaps should be set according to factors such as the shape of the die, deformation characteristics, and process conditions. The thickness of the coating should be considered when setting the gap.
f) Most coatings can be used as solid lubricants and can meet the lubrication requirements of most forming processes. Some coatings can adjust the formula to improve the lubricity of the coating. If the lubricity of the coating is insufficient, the lubricity can be improved by oil coating, wax coating, peelable protective film and the like. However, it should be noted that the wetting agent solvent is easy to absorb dirt and should be removed before installation. The peelable protective film should also be removed as soon as possible after the end of processing.
g) Reasonable processing speed should be set according to equipment conditions, process conditions, part shape and other factors. If the deformation speed is too high, the coating will peel off easily. At low temperatures, the coating's flexibility decreases, so low-temperature processing should be avoided. If the ambient temperature is low, the material should be preheated to a certain temperature before processing.
h) The section of the cut produced during processing is prone to corrosion. Therefore, necessary protective measures should be taken, such as protective coatings, seals, etc.
i) The burrs on the cut surface shall be minimized during processing to prevent burrs from scratching the surface.
j) All surfaces in contact with the coating shall be kept clean and tidy, and chips and metal particles generated during processing shall be cleaned in a timely manner to prevent foreign matter from damaging the coating surface.
k) During the processing, the wear of the roller surface of the forming roller or the surface of the die should be minimized, the contact surface should be kept clean, and defects such as indentation and scratching on the surface of the coating should be prevented.
l) As far as possible, the factory should be pre-assembled and then sent to the site for installation. Protective measures should be taken during installation to prevent damage to the coating.
m) When the coating surface is found to be damaged during processing, a special repair coating should be used for repair in time to prevent corrosion at the damaged part.
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