1/28/2024 0 Comments Dmesh for windowsEven back then, the advertisements made it seem like the software was powerful and easy to use-such that even an inexperienced designer could use it to design better plastic parts. The software was shipped on 8-inch floppy disks and only ran on a mainframe computer with dedicated work stations.Īs an eager young graduate student, I had soaked up the many articles written in the trade magazines and conferences on filling analysis. The graph shows that the use of higher pack pressures or a larger gate is required to adequately pack out the thicker section of this part.īack in the 1980s, as a graduate student studying plastics engineering at (what was then called) the University of Lowell, I remember sitting in the new computer lab staring at several unopened boxes of mold filling analysis software. Note that gate sets up at 1.7 seconds, while the thicker section of the part requires 19 seconds. temperature at the gate and thicker section of a part. Note the higher temperatures at thicker wall sections.įigure 7: Graph of time vs. This allows for the analysis of potential sink/voids due to the heating of the exposed wire insert.įigure 6: Analysis image of an automotive bracket, showing part temperatures and cross section at end of an 18-second pack time. The software calculates the thermal effects of the inserts: the tube (an insulator) and the wire (a conductor). This mesh has more than 3 million elements, resulting in longer analysis times.įigure 5: Temperature at time of mold opening for a medical part overmold with a plastic tube and insert wire. On the right image, the mold temperature at the end of cooling is shown for the part cavity and cross section of the mold.įigure 4: Cross section of a 3-D mesh of a part, mold, and water lines. accuracy of results.įigure 3: Analysis model of a two-shot overmolded cap with a complicated mold cooling layout. ![]() Deciding which mesh to use depends on the skills of the analyst for a balance of analysis time vs. On the right, a dishwasher basket is shown with elements “puffed” to show thickness.įigure 2: Today, analysis is typically done with 3-D meshes of various types shown above: tetrahedral (left), hybrid tetrahedral/ hexagonal, and hexagonal (images from Simpoe meshes). Note the low number of elements and crude representation of the part and runner. Plastics Filling Simulation Software: A 30-Year Journey This "user's perspective" reveals winning strategies for using simulation today Previous Article Next Article By Mark RosenĬorex Design Group, Franklin Lakes, New Jersey, USAįigure 1: A 2½-D mesh from the early 1980s.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |