HI everybody,
I would like to know how moldflow works when you don't set up a runner system.
If you just set the cone, what gate diameter does moldflow use. Is just entering the part at the specific node?
Will holding pressure just be applied at that node?
greeting Philipp
Hi
Moldflow help says
"There is no gate size associated with the injection cone. It simply represents the mathematical starting point of an analysis. A gate should be modeled to ensure accurate results"
with 3D mesh, we can define the gate contact diameter (go to advanced options -- Solver parameters---Gate contact diameter)
yes... holding pressure will be applied at that node..
Thanks
M P Pradeep Kumar
It is for 3D mesh
A gate contact diameter is used by the Coupled 3D Flow solver in a Fill or Fill+Pack analysis.
To access this dialog, choose an analysis sequence which includes Fill or Fill+Pack. Click Analysis > Process Settings Wizard. Click Next, if necessary, until the Fill or Fill+Pack page appears. Click Advanced Options, then click Edit in the Solver Parameters group. On the Thermoplastics injection molding solver parameters (3D) dialog, select the Fill+Pack Analysis tab. In the Solver setup group, select Use coupled solver, then click Solver Parameters.
The Gate contact diameter option assigns a virtual gate diameter to each injection node when a modeled gate or runner system is not provided (direct injection). This improves the flow front prediction and provides more accurate pressure results and better jetting representation around the gate. However, where possible, it is advisable to include a modeled gate or runner system.
To ensure that the applied gate diameter is reasonable, mesh-dependent upper and lower limits are applied.
The effective surface area (A)of the injection node is calculated as one third of the sum of the tetrahedral surface facets surrounding the node. From (A), an effective diameter (D) is calculated. The upper and lower limits are then set as (10D) and (D), respectively.
As a result of these calculations, if more than one injection location is specified, the individual gate diameters may vary.
If more that one injection location is specified, all gates will have the same size, temperature, pressure and shrinkage irrespective of the part geometry or facet size.
upper and lower limits are set as 10mm (5D) and 2mm (D), in some moldflow online link mentioned as 20mm (10D) and 2mm (D), but not sure it is correct
refer below link
2. http://help.autodesk.com/view/MFIA/2014/ENU/?guid=GUID-3C95FC7F-CFFD-4813-9245-056497635C3D