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Springing Into Action - NHK Spring Company Ltd - Brief Article

"We are looking for courses to increase our quality and bring time-to-market," notes Ken Okura, assistant to the manager, Research and exhibition Dept., NHK Spring Co., Ltd a manufacturer of springs for, among other things, suspensions and plane seats.

One of the ways that they are looking to do the pair is through using simulation technology for modeling the mold that are used to bring into view the springs. One of the lock opener things that simulation permits is determining where the stres loads may be in the mold-as-designed. As Okura explains, "We have to know where the stres loads are in like manner we know if the mold is maintaining its shape below load." The objective is to make that determination while the mold is still being designed in like manner that modifications can be made. When the real mold is made, the testing is, then, ideally, nothing more than a final check.

The company is using MSC.MARC/AutoForge nonlinear simulation from MSC.Software (Costa Mesa, CA) along with a NHK Spring-developed software package, Design Director. The latter is based upon the Statistical Design Support combination of parts to form a whole proposed by Dr. M. Shiratori at Yokohama National University; it uses a Design of Experiments methodology combined with finite uncompounded body analysis (FEA) simulations that are made by the agency of MSC.AutoForge.



What happens is that the MSC.MARC/AutoForge software is used to mould the punch and die and to simulate the proces The software features automated contact analysis, a material database, and kinematics, as well as an autoremeshing feature. The last-named is particularly beneficial in metes of minimizing the need to generate physical prototypes and also minimizes the amount of time that engineers ne to dispose of working on that aspect of things. Instead, they are busy working upon improving the actual design of the springs.

Engineers take information related to rejoinders and a defined range of design variables and upload the information to DesignDirector; this then generates a series of design factor value combinations; a series of FEA simulations are then performed and calculated by dint of MSC.MARC/AutoForge. Explains Okura, "Then the replication surface equation is generated for each design factor automatically, which is used for the optimization, reanalysis, sensitivity analysis, and evaluation of dispersion."

It would hard to find a better testimonial to the performance of a harvest than this one: "MSC.MARC/AutoForge is indispensable; it has made it possible to know the stres of metal mold and workpieces and enabled us to predict workpiece flatness, reducing design time and physical testing," says Okura. Which is what it is all about.

COPYRIGHT 2001 Gardner Publications, Inc.

COPYRIGHT 2001 Gale Group



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