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Hirata Corporation
Using scSTREAM to Evaluate Airflow in Production Facilities Improves the Technical Staff's Understanding and Enables More Effective Presentations to Clients

Airflow control is crucial in the production of equipment used for semiconductor assembly. These processes require a clean environment and delicate control of the facility air-conditioning system. As a total manufacturer of production facilities, Hirata Corporation uses scSTREAM, a thermal-fluid analysis tool, to simulate the principal flow mechanisms for different types of manufacturing facilities and equipment. Using the tool is beneficial in many ways. It is used for product development and to more effectively communicate the results in presentations.

 

Presentation of the Density Distribution of N2 to Clients

Hirata Corporation conducted flow analyses to investigate nitrogen dispersion within the EFEM. To avoid oxidization of the wafers, the EFEM is equipped with a nitrogen purge function to fill up the FOUP interior with nitrogen. A large amount of nitrogen leakage to the surrounding environment can be harmful to human operators. Consequently Hirata Corporation found that one of the first questions a client had early in the buying process was the amount of possible nitrogen leakage. At the same time, Hirata Corporation engineers were eager to understand how effectively the nitrogen could be distributed within the EFEM by positioning sensors at the ideal spots.

The EFEM is 2 m in width and length. The depth is 1 m. The nitrogen enters through 20 mm diameter holes. With holes this size, the computation domain dimensions are two orders of magnitude greater than the holes. This means a high mesh density will be needed near the holes to properly resolve the jet dynamics. Hirata Corporation engineers successfully identified the ideal size of the mesh elements after consulting with Cradle support engineers. Moving objects in the model were output in Nastran format and imported to the scSTREAM pre-processor. Approximately 7 million mesh elements were needed to properly represent the EFEM which contained several hundred components.

Hirata Corporation engineers conducted analyses of the FOUP to determine how the nitrogen would disperse from two outlets in the lower section during the purge process. They also wanted to know how the dispersion changed as the carrier device moved horizontally and vertically (Figure 2). Hirata Corporation believes that this assessment and the visualization results were crucial for helping them demonstrate the effectiveness of the equipment and to ultimately secure the sale.

Figure 2: Visualized cross section of nitrogen concentration during the purge
Side view (left) and top view (right)
Color bar indicates the concentration of nitrogen

 

Diversifying the Application of scSTREAM

With the success of the EFEM and FOUP analyses, Hirata Corporation now uses scSTREAM for development of many of its other products. Another product is the FFU (Fan Filter Unit), which is designed to permit clean air to move downward. This produces less blockage while keeping the inner pressure 3-5 Pa higher than the surroundings and maintaining a flow velocity between 0.3 to 0.5 m/s. Hirata Corporation used scSTREAM to identify the ideal geometry and allocation of the holes. They also performed simulations of the FFU for the carrier devices used for glass circuit boards.

Using scSTREAM led to cost reductions and shorter development time. The visualization results have also proved effective for both internal and client presentations. Hirata Corporation expects to apply scSTREAM during development of more and more products.

Picture 4: Mr. Motoyama

Excellent Support Increased User Satisfaction

Hirata Corporation engineers highly regard the quality and speed of Cradle support. Responses to inquiries were within one day. Mr. Motoyama says that it was much faster than the other tool developed by an international CFD software firm outside Japan. The complicated inquiries are first submitted to the agencies, which are then forwarded to the developer. In the end, it took two to three days to receive a response. “As we are a manufacturer based in Japan, using the software developed in Japan meant greater benefit. Their support helped us tremendously when we first started using the software. Back then we tried to start with very complicated analyses that involved moving objects even though we had very little understanding of the software. Thanks to the support Cradle engineers provided, we could learn how to make the most of the software,” says Mr. Motoyama.

Mr. Motoyama attended scSTREAM seminars organized by Cradle. “I remember that the Cradle sales engineer suggested I take the examination for the Certificate for Computational Mechanics Engineers. That inspired my motivation in learning about CFD (Computational Fluid Dynamics),” recalls Mr. Motoyama. He studied CFD theory using the Cradle software user guide and various papers. This also helped him better understand what the software could and could not do. Mr. Motoyama says: “I needed to acquire the ability to judge the results correctly, so I revisited the basics of CFD and fluid engineering.” Although he covered the fundamental topics of CFD in college, he says that he was much more focused after being assigned to analysis team at Hirata Corporation.
 

Further Challenge Using New Features

When scSTREAM was first introduced, Hirata Corporation conducted analyses of large, square-shaped equipment which worked well using the conventional structured mesh capabilities of scSTREAM. They are now ready to move on to analyzing curved targets using the cut-cell function in scSTREAM. “If we can use the cut-cell function correctly, I think that we will be able to analyze curved objects without using the unstructured mesh SC/Tetra software. We are looking forward to further advancement of the cut-cell function,” says Mr. Motoyama.

Hirata Corporation has made steady progress in incorporating scSTREAM into their product development processes. And they expect to extend the range of applications even further in the future.

 

​​*All product and service names mentioned are registered trademarks or trademarks of their respective companies.
*Contents and specifications of products are as of December 1, 2014 and subject to change without notice. We shall not be held liable for any errors in figures and pictures, or any typographical errors in this brochure.

Company Details











 

Hirata Corporation
Founded December 29, 1951
Business Manufacturing of production systems, industrial robots, and logistics equipment
Representative Yuichiro Hirata, President
Employees 1940 (consolidated)*
64 (non-consolidated)*
Locations - Headquarters in Shinagawa-ku, Tokyo, Japan
- Kumamoto Headquarters in Uekimachi, Kita-ku, Kumamoto-shi, Kumamoto, Japan
Capital Approx. 2.6 billion JPY*
URL http://www.hirata.co.jp/en/

* Figures are as of March 2014

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