Week - 4 - 2D meshing for Plastic components

AIM:-

To extract the manual midsurface of the bottle cap and then mesh the component with given quality parameters.

OBJECTIVE:-

The bottle cap component is given with various thickness in thread ,teeth,and ribs. Taking manual midsurface with different procedures and meshing the component with 1mm target element size and mentioned quality parameters.

S.No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	3
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum  Tria Angle	30
11	Maximum Tria Angle	120
10	Tria Percentage	15

PROCEDURE :-

Open the model in ANSA

Checking the geometry with errors such as triple,single cons ,cracks etc. And those errors are fixed by Auto fix option.

MID SURFACE

Extract the mid surface manually by different methods

Initially extract the mid surface for ribs.

by using (face +middle and offset)

for identical faces use middle .

for non identical faces use offset.

To generate the mid surface at fillets must know thick ness at that fillet.To measure the thick ness use weld spot and project it on opposite face and measure between that two weld spots.

To generate the midsurface  for threads use (curves+ middle ) generate the mid curve and project it on the surface and create the new face .

  

Close these type of paches by creating new face 

Join the faces by using (Extend and creating new face etc.)

extend the ribs to suface and intersect it and delete the unwanted entity.

Assign the target lenth 

perimeters+length+perimeter,macros+selecting entites+middle click

Switch to topo module to mesh module and start the meshing one by one entity .

give the mesh parameters and Quality criteria.

generate the mesh manually by using the best mesh.

solve off elements by using smooth and reconstructing commands.

solve the tria elements at perimeter and macros.by using split and swap 

and finally setPID 

conclusion:-

The bottle cap component has a different types of ribs and varing faces the mid surface for this component is done with different option,taking it manually and mesh for this component with small element size but they are fixed with reconstructing and smoth option and achive with quality criteria.