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2020

pretreatment process of heavy-duty vehicle frame coating production line

Author：

Chason

The frame is the basis of a heavy-duty vehicle. The harsh working environment of the frame determines its need for high corrosion resistance. The quality of the surface coating of the frame directly affects the service life of the entire vehicle. Reasonable and effective frame coating The production line can guarantee the coating quality of the frame. The quality of the pre-treatment process directly affects the spray quality of the coating production line, and indirectly affects the quality of the surface coating of the frame. The pretreatment process of heavy-duty vehicle frame is divided into degreasing and phosphating. Next, the composition and process flow of heavy-duty vehicle frame pretreatment process equipment will be introduced in detail.

pretreatment process
The pretreatment equipment consists of process tank, auxiliary tank, platform, circulating spray pipeline system, temperature control device, air supply and exhaust system, feeding system (including degreasing, meter adjustment, phosphating), shaft seal liquid system, degreasing system, Slag removal system, tank liquid transfer system, phosphating cleaning device, water supply pipeline, lighting system, sewage system and electric control system.
1. Degreasing
The degreasing effect directly affects the performance of the paint film. If the degreasing process is not clean, it will cause defects such as shrinkage.
This line adopts the chemical degreasing method. Firstly, the frame is immersed in the pre-degreasing bath at 45 ～ 60 ℃ for 2 min, and then immersed in the degreasing bath at 45 ～ 60 ℃ for 3 min. The temperature is automatically controlled by an electric valve to meet the process temperature requirements. And can be adjusted within the process temperature range.
The degreasing of the pre-degreasing and degreasing tank liquid is to pump the oily liquid in the pre-degreasing and degreasing tanks into the degreasing tank through the water pump, and then heating by the radiator in the tank, so that the oil will be separated and floated to the surface, and discharged to the sewage through the surface overflow pipe The liquid in the tank returns to the pre-degreasing and degreasing tank through the pipeline.
In order to remove iron filings, a filter is installed on the pre-degreasing and degreasing circulation pipeline. The filter bag adopts a non-woven filter bag with a filtration accuracy of 150μm. A magnetic rod is installed in the pre-degreasing filter to absorb iron filings.

2. Phosphating
In order to reduce the phosphating slag generated in the production process, the bottom of the tank is designed as a cone shape, and the inclined plate precipitation + continuous automatic slag remover is adopted. The inclined plate precipitation tank is made of carbon steel plate and section steel, and the interior is equipped with a glass fiber reinforced plastic anti-corrosion layer. Pump the thick slag at the bottom of the tank to the inclined plate sedimentation tank. Phosphating continuous automatic slag remover is imported equipment, using Japan Sanjin FK4L automatic phosphating slag remover.
Due to the corrosiveness of the phosphating solution, the phosphating tank is welded by section steel and SUS304 stainless steel with a thickness of 4 mm. The material of the circulation system for the phosphating and subsequent processes is SUS304 stainless steel.
Phosphating heating method selects the heating method outside the tank, the phosphating tank liquid heat exchange system adopts a closed loop automatic heat exchange system, two-stage heat exchange, one stage uses a radiator and a hot water tank, the heat source is steam, and the water is automatically heated to 60 ℃ The hot water makes the temperature of the hot water output to the secondary heat exchange uniform and the temperature does not rise sharply. The second stage adopts a plate heat exchanger to heat the phosphating bath solution to a process temperature of 35 to 40 ℃, and its temperature setting and control are adjustable. The outlet and inlet of the plate heat exchanger are equipped with a stainless steel butterfly valve to adjust the flow and a corrosion-resistant diaphragm pressure gauge.
The above is the introduction about the "pretreatment process of heavy-duty vehicle frame coating production line". For more information about the coating production line, please pay attention!

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