The lack of market research in the early stage of vehicle model development and the inability of market positioning from product definition to product finalization is a process of continuous optimization. Therefore, when a new product is first shaped, the state is closest to the ideal state of the design. Afterwards, adjusting the products afterwards is a reverse design and will destroy the results of optimal design to some extent. If the market research in the early stage of vehicle model development is insufficient or not deep, it will lead to the newly developed product not having enough target and hit rate in the market, and it will deviate from the real demand in the market. The greater the degree of this deviation, the greater the degree of design change in the later stages of product development. In order to meet the market demand and the limitation of delivery time, simple configuration adjustments, addition and subtraction of parts and components will be carried out on the basis of the original design, subject to the subjective increase or decrease of the extensive design and adjustment of the strength and stiffness of each part, rather than the overall planning. Design and adjustment. This will deviate from the results of optimal design, and then the overall balance of product design goals will be destroyed, the reliability of the vehicle can not be guaranteed. In order to avoid the consequences of strength and stiffness problems, some remedial measures such as increasing the strength and stiffness insurance factor of the related assembly can only be used to satisfy these later adjustments, which will inevitably lead to an increase in the quality of vehicle trim. Increase in configuration and functional requirements As the demand for the market and the level of passenger cars have gradually increased, passenger car products have also rapidly developed toward high-grade and humanized. A passenger car that can be favored by the market and satisfy the requirements of grades has more and more configurations and functions, which is another main reason for the increase in the mass of passenger cars. For example, the introduction of passenger vehicle operation levels and related regulations (such as increasing the height of the vehicle to meet the requirements for baggage compartment volume); and the improvement of the vehicle's power requirements (such as the 10m car engine used 10 years ago and the current captain The 8.5m cars all appear less power), the service system requirements increase (such as the universal use of audio-visual systems and toilets), the improvement of safety requirements (such as the universal use of retarder), the increase in the degree of automation requirements (such as ordinary Folding doors have generally been replaced by pneumatic swinging doors, and ordinary folding baggage doors have gradually evolved into pneumatically moving sliding doors), all resulting in a substantial increase in the quality of passenger car conditioning. In addition, in terms of vehicle aesthetics, comfort, sealing, environmental protection (inside and outside the car), etc., with the market's requirements have been greatly improved and improved, in order to achieve these changes must be replaced or added to the appropriate facilities And materials. Many of the lighter parts were replaced by today’s larger, more aesthetically pleasing, feature-enhancing components. For example, rod-mounted rearview mirrors have been largely replaced by rabbit-eared rear-view mirrors, and a large number of aviation luxury seats have been used, as well as noise reduction. The use of noise materials, etc. The variety and complexity of the styling and interiors are accompanied by the improvement of people’s aesthetics and the current market situation in which the bus market is “eye-catching†as an important selling point. In order to meet the market's demand for improved aesthetics and interior aesthetics, the shape of coaches is increasingly pursuing beauty and modernity. In the same way, the interior design has become more and more diverse and complex. Such as large-scale molding of glass fiber reinforced plastic (), plastic parts, foam parts and other decorative parts. It can be seen from several buses that have been sold well in recent years that more and more structures (such as complex curves, bosses, flanges, etc.) that are specially designed to achieve the styling effect have appeared on the styling. . However, corresponding to the increasing complexity of modeling, the level of most passenger cars has not been qualitatively improved, resulting in the styling effect being achieved when the existing technology cannot be satisfied. As a result, the body structure has increased many supporting profiles and fixtures designed specifically for modeling services. Pads. The same situation can also be seen in the interior design. In order to meet the market demand and increase the reserve intensity excessively, in order to improve profitability and speed up the withdrawal of funds, bus passengers in the peak season are more serious. In order to make their products to meet this kind of operating conditions, bus manufacturers take the initiative to increase their reserve strength when designing buses. The way to increase reserve strength is often to set a very large design safety factor, and to increase the design safety factor, so that the total Chengdu appears to be "stiff", and the quality of the preparation must increase substantially. Air Cooling Belt Conveyor System Twin Screw Extruder adopts big brand parts, highly automatic controlling system, which is easy to operate and stable quality. This line has good mixing, dispersion and extrusion performance, which will help make top-quality pellets. 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