Door Arm Rest Week 8 Challenge

DOOR ARM REST

AIM: To create a door arm rest from the given Class A surface by adding a thickness of 2.5mm to it and also carry out the draft analysis of the component.

Tooling Axis: Tooling axis is nothing but the direction in which the core and cavity opens and closes. Design engineer works is to analyse the Class A surface and find out the best possible tooling direction keeping in mind all the draft angle is with respect to the tooling axis so that the component can be easily ejected from the moulds.

Class A Surface: In automotive design a Class A Surface is any of a set of freedom surfaces of high efficiency and quality. Although, strictly, it is nothing more than saying the surfaces have curvature and tangency alignment to ideal aesthetical quality, many people interpret Class A surfaces to have G2 (or even G3) curvature continuity to one another. Class A surfacing is done using computer-aided industrial design applications. Class A surface modellers are also called “digital sculptors” in the industry. Industrial designers develop their design styling through the A surface, the physical surface the end user can feel, touch, see etc.

Class B Surface: Represent internal and functional surfaces. This cluster exemplary included derived surfaces created by offset operations from Class A surfaces to define the thickness of material. In this file it is important to link Class B Surfaces geometrically to enable an adaptation to Class A surfaces automatically in case of styling change.

After creating the tooling axis, B surface is to be created which is nothing but the surface parallel to the A surface, B surface contains all the fillets and the edges which the Class A surface contains.

Class C surface: Class C surface is swept along the boundary of the Class A at an angle perpendicular to the Class A surface with respect to the tooling axis direction with a draft angle of 3 degree.

Joining of Class A, Class B and Class C surfaces to get a closed surfaces:

After finishing all the three surfaces, join the Class A and Class C surface together using the join command. Now the joined surfaces are then trimmed with Class B surface to form a closed surface.

Draft Analysis: The draft analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on colour ranges identifying zones on the analysed element where the deviation from the draft direction at any point, corresponds to specified values.

Draft angles are very important in thermoforming product design. If the product is formed onto a female or negative mould, it shrinks away from the mould side walls. As a result, true female or negative products can be thermoformed with vertical walls having zero draft angles.

TREE STRUCTURE:

VIEWS

ISOMETRIC VIEW

FRONT VIEW

SIDE VIEW

TOP VIEW

Result:

• Class A, B and C surface was created as per the automotive standards using Catia V5 software
• Draft analysis was performed for the built model and it could be seen that the draft was under permissible limit for the manufacturing of the component.