Door Arm Rest Week 8 Challenge

AIM: To create the DOR AR REST through the given class-A surface. To begin with, the tooling axis for the given class-A surface should be created meeting the requirements of the draft angle and at the end perform the draft analysis on the model.

OBJECTIVES:

Take the Thickness of the component to be 2.5mm.

1. Explaining the draft analysis and the tooling axis creation.
2. Creating the tooling axis particularly the bisecting method.
3. Draft analysis report for both the given class-A surface and the final plastic component.
4. Take the Thickness of the component to be 2.5mm

ABSTRACT:

DRAFT ANALYSIS: The major consideration of Draft analysis is whether sufficient draft angle is provided on the component. Components while designing should be provided with a considerable amount of draft angle depending on the manufacturing consideration. For plastic components we provide a draft angle of 3 degree. But for Automotive sheet metal parts, it will be from 7 degree or more.

TOOLING AXIS CREATION: The direction in which the mold or core and cavity opens is the tooling axis. With the help of the tooling axis created along the X-axis and the Y-axis, these tooling axes are used for creating by bisection method.

Where the two lines and point will be selected as inputs.

PROCEDURE TO PERFORM A DRAFT ANALYSIS AMD TOOLING AXIS CREATION IN CATIA

STEP 1

Connectivity of class-A surface: First checking the connectivity of the class-A surface, this can be done by creating boundaries or by using the join command and see how well it is connected. Just ensure there is no surface gap between component or surfaces. This is the first design step to check continuity and the quality of the class-A surface.

STEP 2

Analyze visually for the best possible tooling axis for the component.

Checking possibilities in all three x, y and z axis direction and finding what are the problem creation parts of the component.

The clearance checking along all the axis directions will be done by creating an intersection along an axis on a plane with the model and constructing two lines contact with the walls, the line bisecting the two lines and passing through the point will be the tooling axis.

CREATION OF TOOLING AXIS ALONG Y-AXIS

Using the intersection, lines will be created along the inclined walls and as there is only one wall another line will be created at a certain angle to the wall, these lines are used for creation of tooling axis by bisecting method where the two lines and point will e selected as inputs.

CREATION OF TOOLING AXIS ALONG X-AXIS(SLIDE CORE TOOLING AXIS)

Using the intersection, lines will be created along the inclined walls, these lines are used for creation of tooling axis by bisecting where the two lines and point will be selected as inputs.

TOOLING AXIS CREATION

Using the tooling axis created along X and Y-axis, these are used for creation of tooling axis by bisecting method.

Where the two lines and point will be selected as inputs.

Publication:

Publication is used to make easily accessible of the published components.

Draft analysis:

Draft Analysis is done after determining the tooling axis, draft analysis is used to check whether the minimum draft 3degree is maintained or not.

Compass is used to define the draft direction.

If the minimum draft 3degree is provided the whole component changes into green colour.

CLASS-B SURFACE:

Class-B surface is created by extracting each walls and un-trimming and extrapolating the walls to obtain the shape by trimming the excess surfaces and offsetting it to a certain distance based on the thickness of the model. The offset surface will be the B-surface.

CLASS-C SURFACE:

The surface created using sweep command by sweeping the boundaries of A-surface along the tooling axis to connect from A to B surfaces is known as C-surface.

Using the Band C surfaces created a closed surface will be formed by trimming the excess surfaces the surfaces will be converted into a solid model using closed surface option.

DRAFT ANALYSIS FOR PLASTIC COMPONENT

DRAFT ANALYSIS DONE BY MAIN TOOLING AXIS.

DRAFT ANALYSIS DONE BY SLIDE CORE TOOLING AXIS.

Screenshots of the door arm rest draft analysis part including expanded tree structure is attached below.

1.front view.

2. Back view.

3. Left side view.

4. Right side view.

5. Top view.

5. Bottom view.

6. Isometric view.

7. Rest of Expanded feature tree images.

Conclusion: Solid model of Door arm rest is achieved by creating class-B and class-C surfaces from the given class-A surface, by using tooling axis bisection method and also made draft analysis for the model.