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Session 1447

DEVELOPMENT OF AN APPARATUS FOR TESTING INJECTION VALVES FOR LIQUID MOLDING APPLICATIONS

Vladimir Sheyman, Mulchand S. Rathod, Christopher P. Karas Division of Engineering Technology Wayne State University, Detroit, Michigan

Tel: (313) 577-0800, Fax: (313) 577-1781 E-mail: rathod@et.eng.wayne.edu

SUMMARY switch was added to the system. A twenty-four- channel data acquisition system for pressure This paper deals with development of a sensing and pressure drop assessment and a 486 special leak and flow test apparatus. This CPU 166 MHz PC unit were used. apparatus would be used to check the reliability and performance of an innovative pneumatically Three individual channels were used in operated injection valve for liquid molding the experimentation. The software used is an applications. Also included are the results of application generator Windows based program various tests. This design is an example of one of called Visual Designer that enabled real-time the author’s senior project carried out to fulfill BS observation charting and data recording. The degree requirement. input and output ladder diagrams were pro- grammed for the experiments to record data. There is an increasing trend towards the use of advanced materials, specifically, polymer The results and discussion of the composites to improve corrosion resistance and to following tests are presented in this paper: air reduce weight in structural and nonstructural leak check in the flow position; air leak check in components. Such components have good the flush position; water flow check in flow and potential for aerospace and automotive flush positions; cycle test; and air leak check after applications. Liquid molding processes such as cycling. This newly developed valve passed all resin transfer molding are becoming popular for tests and surpassed the expected outcomes. producing fiber composites of low cost tooling and processing. As a part of this project, a new INTRODUCTION self-flushing pneumatically operated valve for liquid molding applications was developed and This paper describes a project that deals fabricated [1]. This valve was used to replace the with the development and comprehensive testing manual processes and old- fashioned techniques in of a unique, pneumatically operated injection order to maintain production quantity, increase the valve for liquid molding applications. The use of quality of the product, and to decrease the cycle composite materials is becoming more prevalent time. in industries such as aerospace, automotive, and recreational market sectors. Composites offer a A special test apparatus was developed lightweight, high strength alternative to metals by and fabricated to check the reliability and incorporating complex part geometry repla cing performance to meet the specification for leakage multi-piece welded metal components. and fluid flow. The injection valve was attached to a panel and nylon tubing with quick disconnect Among current composite manufacturing pressure fittings. A solenoid was wired to a timer processes such as liquid molding (although consi- with on /off relay switch and was used to enable dered a low volume process) show potential to cycling of the injection valve. A main toggle produce quality parts at a lower cost. Some of the

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Karas, C., & Sheyman, V., & Rathod, M. (2002, June), Development Of An Apparatus For Testing Injection Valve For Liquid Molding Applications Paper presented at 2002 Annual Conference, Montreal, Canada. 10.18260/1-2--11168