Week - 4 - 2D meshing for Plastic components

AIM:

For the given Plastic Bottle Cap model, check for the geometrical errors and take the mid surface by suitable mid surfacing techniques. PID and Thickness assignment has to be done for all the mid surfaces. Mesh the same with given element Quality criteria. (Refer the table Below for the Quality criteria)

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

THEN WE HAVE TO UPLOAD THE GIVEN FILE TO THE ANSA.

PROCEDURE:

1) Check if the component is symmetric or not

2) If it is symmetric, extract the mid-surface only for half portion

3) If a component is not symmetric, extract the mid-surface for the whole component

4)We have to check the auto mid-surface for the component, if it is not giving a better result then, we have to jump to other methods

5)Split the component into simple parts and try to extract the auto mid-surface

6)The distorted surface can be deleted and by using the offset and extend command we can stitch the surface

7) If auto mid-surfacing is not doing well, then we have to do the whole component

8) While extracting the whole mid-surface manually we have to be more clear about the base surface, since the base surface should not be having a varying thickness in the most cases

9)After creating the base mid-surface, we have to take a look at the ribs attached to the mid-surface (we can use surface pair to generate the middle surface and extend them and extend the rib to the base mid-surface If ribs are within the same dimensions, we can use the translate rotate and position option in order to create them again.

10) After that the mid-surface of critical parts like dog houses snap fits, mounting clips etc can be extracted by surface pair and offset option.

11)Check the rib surface is connected properly to the base. There should be a T-Connection between the base mid-surface and ribs surface

12) Meshing the surface from the complicated region and moving toward free edges

BOTTLECAP MODEL:

THE GEOMETRY OF THE WHOLE MODEL:

TO CREATE THE MESH OF THE GEOMETRY:

After cleaning the parent geometry, now we can start extracting the mid-surface of the component, before going to mid surface option we can also hide our lock the view of geometry that we require for easy working, we can store the view by using lock option, Now for manual mid-surfacing we can use the offset option to offset the surfaces into the middle, also we are using the middle option in Face panel, to create the middle surface between two surfaces.

AFTER THAT WE HAVE TO TAKE THE MID SURFACE FOR THE EACH PART:

TOP SURFACE:

CHECK THE PROPERTY OF THE MATERIAL:

PROPERTY HELP:

MID SURFACE OF THE TEETH:

For rotating the teeth first, we have to create the axis of rotation, for creating the axis of rotation we need two different points at the center at a different height, for that we are using the COG option in the point buttons, select the circle having two different heights to create a center point at a different height.After creating the centre points, now we can go to rotate command, here we have to define the angle and no of teeth to be formed, also here we have to define the axis of rotation by selecting two centre points that we created previously.

MIDSURFCACE OF THE TOTAL COMPONENTS:

HERE WE CAN SHOW THE TOTAL MESHING COMPONENT:

RESULT:

HERE WE CAN GIVE THE GEOMETRICAL ERRORS AND TAKE THE MID SURFACE BY SUITABLE MID AND SURFING TECHNIQUES.

GOOGLE DRIVE LINK:

https://drive.google.com/file/d/1UNEozRAwBhWKehNEHABz86ZksrNc1Ckw/view?usp=sharing