The process flow of painting production line is divided into pretreatment, powder spraying, heating and curing.
There are manual and automatic pretreatment processes before treatment, and the latter can be divided into automatic spraying and automatic immersion spraying processes. Workpiece must be treated to remove oil and rust before powder spraying. There are many medicinal liquids used in this section, such as rust remover, oil remover, surface conditioner, phosphating agent and so on.
In the pretreatment section or workshop of the painting production line, the first thing to be noticed is to establish the necessary system of purchasing, transporting, keeping and using strong acid and strong alkali, to provide workers with necessary protective clothing, safe and reliable filling, handling and disposing equipment for the painting line of the automotive transmission shaft, and to formulate emergency treatment in case of accidents. Measures and rescue measures. Secondly, in the pretreatment section of painting production line, there are a certain amount of waste gas, waste liquid and other three wastes, so in environmental protection measures, we must configure exhaust gas, drainage liquid and three wastes treatment device.
The quality of pre-treated workpiece should be different because of the different process flow of pre-treatment liquid and painting production line. In order to prevent rusting again in a short time, the workpiece with better treatment should be phosphated or passivated in several processes before and after treatment. Before powder spraying, the phosphated workpiece should also be dried to remove surface moisture. Small batch single production, generally using natural air-drying, sun-drying, air-drying. For large-scale flow-line operation, low-temperature drying is generally adopted, and oven or drying channel is used.
Coating Line for Driving Shaft
For small batch workpiece, manual powder spraying device is generally adopted, while for large batch workpiece, manual or automatic powder spraying device is generally used. Whether the plastic coating line is manual powder spraying or automatic powder spraying, it is very important to control the quality. To ensure that the sprayed workpiece powder uniform, uniform thickness, prevent thin spraying, leakage spraying, rubbing and other defects.
In this process, attention should also be paid to the hook part of the workpiece. Before entering the curing process, the powder attached to the hook should be blown off as far as possible to prevent the curing of the surplus powder on the hook. When it is really difficult to remove the surplus powder before curing, the cured powder film on the hook should be peeled off in time to ensure the conductivity of the hook. Good, so as to facilitate the next batch of workpieces easy to powder.
This process should pay attention to: sprayed workpiece, if it is a small batch of single production, before entering the curing furnace, pay attention to prevent collision powder, if there is powder rubbing phenomenon, should be timely sprayed powder. Strict control of technology, temperature and time during baking should be exercised to prevent inadequate curing caused by chromatic aberration, over-baking or too short time.
For large quantities of Auto-conveying workpieces, it is also necessary to carefully check whether there is leakage, spraying thin or local powder rubbing before entering the drying channel. If unqualified parts are found, they should be well guarded against entering the drying channel, and re-spraying should be removed as far as possible. If individual workpieces are not qualified for thin spraying, they can be re-sprayed and re-solidified after solidifying the drying path.
The so-called coating refers to the metal and non-metal surface covered with protective layer or decorative layer. Painting pipeline has experienced the development process from manual to production line, to automatic production line, and the degree of automation is getting higher and higher. Therefore, the application of painting production line is more and more extensive, and has penetrated into many fields of national economy.