Week 9 - Attachment Feature Creation - Challenge 2
Tooling Axis creation:
It is defined as the direction in which the mould/core and cavity open. Selection of thedirection of the tooling axis depends on the ease at which components can be easilyejected.
By analysing the component the most easily ejectable direction is somewhere close to theZ direction,(might be inclined to it) so we have made a sketch on the YZ plane of AxisSystem) to create a bisecting line considering the 2 faces which might be difficult to betooled.
DRAFT ANALYSIS
Draft analysis is a method used in design to check whether the component created in CAD is manufacturable based on the draft condition applied. The main reason behind the draft analysis is the part manufactured should be easily removed from the mold. It also gives an
idea of the draft angle from the tooling direction. Here we are giving a tooling direction in order to eject the component easily from the tool. The ideal draft angle given in automotiv industries for plastic components is 3 degrees. Some of the components where draft analysis is done are hood, fenders, roof, side doors, etc.
The draft analysis is an important tool as it helps the user to analyze the draft on various surfaces, the draft analysis in CATIA uses the color codes for the identification of the draft. Each color has its own meaning for the minimum draft negative draft and under draft. The draft analysis toolbar provides two modes for analysis of the draft, first is the quick analysis which basically has three colors for analyzing GREEN, RED, AND BLUE on the other hand other option is the full analysis mode which enables a few more details into the draft
and is used in the complex components like the instrument panel, etc. In the above challenge, we have used the quick analysis made for analyzing the draft here. Now, bring the compass and align it with the tooling axis and click the lock button in the dialog box.
CREATING THE DOGHOUSE
The dog house is an engineering feature used in the plastic trim design. Dog houses are used as a supporting feature. Sometimes other engineering features like snaps; locators, etc. are mounded on them to increase their strength. The doghouse is created by following the design rules. The nominal wall thickness guide range is from 0.75 mm to 3 mm for reinforced materials and 0.5 mm to 5 mm for unreinforced materials. Related Courses WALL THICKNESS (W) = 0.70 (NOMINAL THICKNESS OF PLASTIC MATERIAL) This process is usually done by Thicken surface command.
An important thing while designing a doghouse is to maintain 40% less thickness than the wall thickness (T) at the area of the intersection to avoid sink marks. So, a C shape is formed at the intersection.
This can be made using the split command to remove the solid at the intersection.
