I、Automotive Manufacturing Industry Clean Room Overview:
Siemens, a German automaker, has used a clean 10,000-level facility for fuel injector assembly workshops more than a decade ago. Eight years ago, as a clean room consultant, I designed a fuel-level fuel jet assembly facility with a 10,000-level cleanup design for Ford, which is closer to a typical semiconductor facility rather than a traditional car production line.
We sampled the air in the presence of the "clean room" in the car, and the results showed that the volume of pollutant particles was relatively large, usually around 50μm or more. The production of these particles is mainly due to poor pressure and the lack of air chamber and channel, as well as the neglect of the equipment, staff and components of the pre-cleaning work.
1, before entering the clean room, pre-cleaning equipment, personnel and parts;
2, with a controlled multi-stage pressure, temperature and humidity control device sealed building;
3, HEPA filtration;
4. Enhance the process to reduce the production of particles / precipitates;
5, protective coat;
7, the two-door configuration will separate the adjacent space, including the delivery and reception area.
III、Automotive manufacturing industry clean room instructions:
1, in a relatively large car assembly environment, from the robot and other assembly equipment on the distribution of oil mist and metal particles will be dispersed into the air, sophisticated mechanical components must be cleaned and processed. The core of this problem lies in the provision of clean areas or protected areas, the painting and the important production areas separated to avoid cross-contamination. Control air pollutants, can not let it into the production area, such as the engine and transmission assembly area.
2, contaminant particles gathered in the component inappropriate position may damage its function or make it completely scrapped. Diesel jet technology is a good example. From 1996 onwards, in five years, the technical performance of the rapid increase, the result is the injection pressure is getting higher and higher, nozzle size smaller and smaller. The maximum pressure of the high pressure pump is above 2000 bar, and the fuel is injected into the combustion chamber through a hole having a diameter of about 100 m. In the production of such systems only to ensure that different components of a high degree of cleanliness is not enough, the assembly process must also be carried out in a highly clean environment.
3, the injection system shows that many automotive components must keep the surface clean, but these key areas are often concentrated in the internal components. Many components are made of very complex metal structures that are machined into final shapes after forming and contain media through holes or require a highly clean inner surface. The only way to check the cleanliness of this component is to remove all particulate contaminants through the cleaning process and then analyze the cleaning solution. In order to do this, it is common to deposit particulate contaminants onto the filter membrane and then perform microscopic analysis or gravimetric analysis.
In the manufacturing environment, people are concerned about the size of the particles are generally larger, they will not spread like smoke, but will fall on the surface of the components, so in the semiconductor clean room in the air control program is completely different. In addition, the scope of concern is becoming narrower and narrower, and the maximum diameter of the contaminants to be controlled is between 80 and 120 m, and the smallest is between 40 and 60 m, such as metals and contaminants. The goals of these users are no different from those of conventional clean room users: to prevent defects and functional defects that are seen with the naked eye.