Week 9 - Attachment Feature Creation - Challenge 2

DOOR TRIM WITH B SIDE FEATURES(DOG HOUSE):

Dog House is an engineering feature used in plastic trim design. Dog houses are used as supporting feature. Sometimes other engineering features like snaps; locators etc. are mounded on them to increase their strength

Aim:

To design the complete solid model of Door Trim and B-side Attachment feature such as Dog House with the help of Class A surface(input) by creating the tooling axis and analysing the draft angle.

Draft angle:

Draft angle (the degree of taper of the side wall of the mold or the angle of clearance designed to aid removal of a part from a mold) increase causes a linear decrease of the force required to remove a molded object from a mold. It is also used to avoid one of the plastic defects while casting is said to be a Drag lines. The minimum draft angle for b side feature is 0.5 degree.

Tooling Axis:

The tooling axis is a direction along which the core and cavity tends to move. Here the tooling axis is created in direction, which is normal to one of the Flat surface of the Door Trim.

Rules to be followed while designing the Dog House:

• Maximum height of the dog house - 30mm to 55mm.
• Coring height - 3mm to 6mm
• Coring thickness - 0.4*T(thickness of the mould part)
• Fillet on the inner side = 0.25*T
• Fillet on the outer side = 1.25 * T
• Fillet on the coring edges = 0.25 * T

Draft Analysis of Class A surface:

The minimum draft angle for the design of plastic components is 3 degree.

Isometric view:

Front view:

Top view:

Side view:

Dog House Creation:

Tree structure:

Draft Analysis of Final model:

Here the complete solid model is achieved the minimum draft angle of 2.9 degree for Door Trim and 0.4 degree for Dog House.

Conclusion:

Thus the complete solid model of the Door Trim along with the attachment feature such as Dog House is formed from the Class A surface(input) and the analysed draft angle is 2.9 degree and 0.4 degree for Dog house.