3D Solid Model CAD Files Add Precision to Gasket Design
Compared to two-dimensional models, solid models are better for specific OEM gasket design applications

Manufacturers of automobiles, farm and construction equipment, recreational vehicles and other gasket-using machinery who employ 3D computer-aided design (CAD) software to create product models can rely on Interface Sealing Solutions (ISS) to facilitate expert 3D modeling of gasket designs.

Three-dimensional modeling technology allows OEM designers to produce engine- and ultimately whole vehicle designs solely with computers. By modeling in three dimensions, designers can electronically complete all the spatial fitting of components with respect to clearances and tolerances—a process that eliminates considerable rework on actual hardware.

OEMs contracting with ISS have access to 3D modeling technology for gasketing designs and to advanced engineering resources that include engineering knowledge, as well as equipment and computer technology.

Using 3D Solid Model files to design gaskets
OEMs' solid-modeling capabilities enable ISS to supply gaskets that are designed with precision.

Before solid modeling, OEM designs were either two-dimensional (2D) prints or 2D CAD renderings. With 2D representations, it was possible to determine what shape to make a product but, with only limited information about joints, CAD could not be employed to completely design a gasket. However, as OEMs began to employ 3D CAD engine and transmission designs, along with solid models, gasket design capabilities became more powerful.

With solid models, sufficient information exists about joints to facilitate performance simulations with Finite Element Analysis and other software packages. Now, based on known characteristics such as bolt loading, flange stiffness, and fluid pressure, CAD can be used to incorporate more gasket parameters into the design than just shape. For example, factors such as thickness, type of material, wall width and surface coating that will enable the gasket to function properly in the joint can now be specified with confidence.

Working with a variety of software packages
OEMs can supply ISS with a variety of 3D solid model software packages. The organization has access to EDS Unigraphics NX and PTC Pro-Engineer Wildfire packages. OEMs needing a design for an oil pan gasket, for example, can employ Unigraphics to transmit files that include engine block and oil pan designs. The designs can then be engineered to the required gasket geometry.

The same thorough modeling can be performed for OEMs using other programs, such as Solid-Edge or CATIA if these files are first converted into a universal exchange format.

ISS believes that the best of these exchange formats is one called ‘STEP file format. For  customers who do not use Unigraphics or Pro-Engineer, ISS will help convert their solid-model files into a usable format.