It is reported that China's current passenger car production has accounted for 1/3 of the total number of passenger cars in the world and has become a truly big passenger car manufacturing country.
Looking back at the early stage of the development of passenger cars in China, after a long period of time since then, China’s passenger cars have always used the chassis of trucks. The manufacturing process is simple and the product quality is not high. Passenger cars were once considered as modified cars. For a long time, because of the limited manufacturing capacity, the quality problems not only affected the service life of passenger cars, even threatened the safety of passengers, but also caused the Ministry of Transport to attach great importance to it. Therefore, they asked bus manufacturers to increase their manufacturing capacity. In recent years, the manufacturing capacity of Chinese passenger car companies has made rapid progress.
Today, mainstream bus companies have introduced cathodic electrophoresis technology, which is widely used in car manufacturing, into the passenger car industry, greatly improving product quality, narrowing the gap with world-class passenger cars, and pushing the manufacturing level of China's passenger cars to a new height.
After 2000, the anti-corrosion and anti-rust of large and medium-sized passenger cars has gradually become a common concern in the global passenger car industry. The passenger car industry once favored the use of new materials such as aluminum alloys to improve the anticorrosive and rust-proof performance of passenger cars. However, the manufacturing process of aluminum alloy materials is complicated and the cost is too high, making cathodic electrophoresis of entire vehicles the best mode of anticorrosive and rust-prevention currently recognized by the passenger car industry.
As the coastal cities and inland cities with abundant rainfall are in demand, the requirement for anti-corrosion and anti-rust performance of vehicles is particularly prominent. Cathode electrophoresis lines for large-scale coaches of Xiamen Golden Brigade and Yutong have been put into production successively, marking the realization of the coating process for large passenger buses in China. Great progress.
The 90th century was the turning point of the manufacturing capacity of China's passenger car companies. Before the 1990s, it was an assembly line and a production line with no automated equipment. It used a block-type side-skin skin riveting manufacturing process. The passenger car production at this stage is labor-intensive, has low production efficiency, is not easy to guarantee quality, and has poor product consistency. After the 1990s, China's bus companies gradually adopted a semi-automated plate chain transmission production line. The production process was improved to improve the overall side-raised structure, the labor intensity was relatively low, the production efficiency was greatly improved, and product quality and product consistency were effectively improved. control.
Bus chassis has also restricted the development of China’s automobile industry. Prior to 2003, the chassis production qualification of passenger cars has been a scarce resource in the industry. Almost all bus companies have to purchase chassis from specialized chassis factories, and then design the body according to the chassis. The model restricts passenger car companies from improving and improving their manufacturing processes. After 2003, China’s mainstream bus companies have successively obtained chassis production qualifications. The R&D, testing and production of passenger cars are no longer subject to chassis companies. They can timely improve products based on market feedback and effectively control the quality of the chassis. The assembly method of the body and the chassis is also welded from the initial body and chassis to the hoisting production in the welding line, and now to the full production of the body. The progress of the manufacturing process enables the components on the chassis to be baked without high temperature in the painting stage, which effectively ensures the quality of the chassis, shortens the procurement cycle of the main components, and reduces the purchase cost.
On the manufacturing of chassis and other core components, advanced technologies such as laser cutting, robot welding and automatic rolling are adopted; on the frame manufacturing, a large number of automated processing equipment such as three-face punching, flat punching and shot blasting are used; the frame painting is fully automatic. Cathodic electrophoresis process; the chassis production line adopts advanced logistics transportation methods such as tire control conveyor lines. Taking full advantage of the advanced technology of passenger car manufacturing in China, it is not difficult to find that the passenger car manufacturing industry in China has made great progress and has the strength to compete with foreign products.
The advancement and improvement of the production process of bus companies also reflected the improvement of China’s industrial manufacturing level from one aspect.
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