On September 20, 2020, the joint venture between Thanh Cong Group and HYUNDAI Motor (Korea) officially started the construction of HYUNDAI Thanh Cong factory No. 2 with a designed capacity of 100,000 vehicles/year at Cockroach Industrial Park. Khau, Gia Vien district, Ninh Binh province.

The project is divided into 2 phases: phase 1 is expected to be completed in June 2022 and phase 2 is expected to be completed in June 2025.

Construction area: 50ha with a 12,150-wide paint workshop, installed the most advanced automotive paint line to ensure product quality in a market with a relatively harsh climate like Vietnam.

Vietnam CNC & Technology Application Joint Stock Company designed and installed 2 automotive paint lines in the factory from 12/2021 to 6/2022. CNC-VINA provides total solutions for modern paint lines, optimal design, and manufacturing, the stable operation when put into operation, high productivity, and environmental friendliness from experts. Vietnam's leading paint manufacturer.

With the advantage of having a lot of experience in designing, installing, and renovating paint workshops and paint lines for big customers in Vietnam. CNC-VINA easily brings trust to customers and brings product lines with the best quality and the most optimal investment costs.

CNC-VINA Company is the main contractor in charge of designing and installing the HYUNDAI automotive paint line including:

• PTED paint line system.
• Paint filter system UF.
• RO, DI water supply treatment system.
• Paint booth system (Paint Booth).
• Burner system, drying oven (Oven) after each painting stage: ED paint (ED Oven), Sealer (Deadener Oven), Primer paint, Top Coat paint (Top Coat Oven).
• Plastic coating system.
• Fresh air supply system for the line (ASU-Air Supply Unit) and air conditioning, temperature and pressure balance for the drying system, and paint booth.
• Air-conditioning system for the paint booth, drying room, and working area (AHU-Air Handling Unit).
• Chiller system provides cold water for ED, and AHU tanks.
• Boiler system provides hot water for the PT tank.
• Area for inspection, polishing, and repair before moving to assembly.
• Tanks, tanks for water, oil, chemicals and paint dip tanks.
• Frame, steel structure tank, drying oven.

Basic car paint technology process

To paint a car you need to prepare and conduct a lot of stages before starting to paint the car. However, depending on the vehicle's shape, size, capacity, painting technical requirements and the level of automation of the customer, some stages of the paint line can be eliminated or incorporated into the paint job. another paragraph, or in addition. But basically, the basic car paint technology process consists of 7 steps:

• Surface pre-treatment before painting PT (Pre-Treatment).
• Apply electrolytic coating (ED) (Electrophoretic Deposition).
• Dry the ED electrolytic coating in the oven.
• Pumping glue to seal the chassis (Sealer), polish (Sanding) and cover the sound (Sound Dumper). Primer and top coat are applied in robotic paint booths and dried in an oven.
• Inspect (Inspection) and repair (Repair).

Working principle of car paint line

Pre-treatment PT (Pre-treatment)

Before the car's frame was painted, it went through metalworking processes. Therefore, before painting it is necessary to treat the surface. The first station in the painting process is pretreatment, where the chassis is completely immersed in hot water, degreasing, chemical baths, and often phosphate to remove impurities and adhered dirt. on the surface to prepare for the ED electrolytic coating step.

Electrophoretic Deposition ED (Electrophoretic Deposition)

After the car's frame has been surface-treated, the car frame will be moved to the next step, which is electrolytic paint, also known as negative electrode paint or DI electric paint. This process coats a layer of anti-corrosion primer by submerging the entire body of the vehicle in an electrically conductive bath to ensure a thin layer of paint that covers the entire bodywork, including the nooks and crannies.

After the electrolytic coating process, the residue on the surface and inside the electrolytic paint and powder coating needs to be treated and restored to cleanliness. Therefore, the UF (Ultra Filtration) filter system helps to restore cleanliness, and restore quality by 80-90% after paint recycling, thus saving the cost of repurchasing electrolytic paint and avoiding environmental pollution. environment caused by the discharge of wastewater.

Indicators of metal components in water, bacteria, moisture, and pH can also change the original paint color, oxidize, etc., so it needs to be removed. The DI water treatment system has the effect of improving longevity and creating high gloss, not being corroded by chemicals and affected by chemical agents, ensuring the best ED coating.

Drying the ED electrolytic coating in the oven (ED Oven)

Products after being cleaned from the previous stage are brought to the ED coating drying line by a conveyor system (conveyor), and lifting system (hoist, cranes). The product is put through the inlet into the drying chamber at a temperature of about 150 degrees Celsius with a drying system that provides heat from gas burners, oil burners (combustion chamber), and ovens (Oven). Each car model will have its temperature and drying time parameters, so a PLC controller is required to control the above indicators. At the end of the drying oven, there will be a cooling system to help reduce the temperature of the car body before going to the next stage.

Pumping sealer (Sealer), polishing (Sanding), and soundproofing (Sound Dumper)

In automotive parts, the undercarriage is the place that is most affected and impacted by the external environment. Being located close to the road surface causes the undercarriage to be constantly in contact, affected by sand, gravel, dirt, water, grease, and other dirt from the road surface. The result is not only dirty chassis but also easy to scratch, corrode, rust, and deform.

At this stage, the body of the car will be taken to the area of ​​glue sealing, sealing and spraying PVC under the chassis and soundproofing to help protect the car's undercarriage from the effects of harmful factors from the environment as well as air conditioning. moving event. Before going to the next stage, the unsatisfactory areas will be polished by sanding machines in the polishing room.

Paint Primer and Top Coat (Base + Clear Coat) in Paint Booth paint booths and dry in an oven

At this stage, the paint spraying robot is precisely programmed with the flow, pressure, velocity, and distance according to each color type and profile of each vehicle, under the support of the paint mixing system (mixing). ), paint dust suppression, air conditioning system, and ventilation.

Primer paint is formulated to smooth ED-based surfaces, protect against rust and create a bond between coats, helping to detect any coating irregularities. and can be sanded easily. Primer can be tinted to match the finish.

Base coat: This is the paint that gives color to the surface of the car, and gives the main color to the body of the car, can be one layer or many layers depending on the nature of the car paint color that the manufacturer or desired customer.

Clear Coat: It is the outermost layer of paint that protects the vehicle's surface from external factors such as sun, rain, snow, UV radiation, dirt, etc.

Check (Inspection) and repair (Repair) before moving to the assembly line

This is the last stage of the car paint line, currently at this stage still mainly uses humans with the support of equipment or collaborative robots.

VIETNAM CNC & TECHNOLOGY APPLICATION JOINT STOCK COMPANY

North factory & Office: Song Cung Industrial Site, Dong Thap Commune, Dan Phuong District, City. Hanoi Vietnam

South office: Lot. H9, Tran Quoc Toan Str, Vo Nguyen Giap Distr., Thu Dau Mot City, Binh Duong Province

Phone: +84,915 74 4 664 / +84,915 740 880

Website: www.cncvina.com.vn; www.cncvina.net

Email: Sales01@cncvina.com.vn | Sales02@cncvina.com.vn