Week 9 - Challenge 3 - Bumper
Respected Sir,
Please look into the below attachment for the report,catpart file.
REPORT WRITING ON BUMPER, BASED ON DRAFT ANALYSIS
Initially, the given surface model is seen in 3 different directions such as x, y, and z axis, using compass. This is done to select appropriate axes which cover the entire surface of bumper. Thus, x axis is selected to create draft analysis. Before doing drafting analysis, the important thing is to create a dummy tooling axis to find the main tooling axis. In simpler surface models, we selected the flat surfaces or flat surfaces consisting holes in a rectangular planes to create the main tooling axis. As we know that, bumper is a type of complicated unique shape. Hence, entire surface model is selected directly to do the drafting analysis by creating the dummy tooling axis in x-direction as the main tooling axis.
Fig (a) representing the point selection on curve, by setting the compass in x direction, as x axes covers the entire surface, on which we can create dummy tooling axes with the help of created point. Also Fig (b) is mentioned below, where line is created as tooling axes.
Similarly, another image is represented above as Fig (b), which depicts the line drawn through the point created using the line command, by selecting point-direction option. This line drawn is nothing but, it acts as a dummy tooling axis. Due to complicated surface model, this dummy tooling axis is referred as main tooling axis and done draft analysis further.
The same tooling axis is used during creation of class C surface. During class C surface some of the sweep models were created by selecting the main tool axis direction. The sweep models made using tooling axis were shown below in the form of figures.
The above 3 figures, Fig (c, d, e) represents sweep models were tooling axes created for draft analysis is used to represent the direction and the draft angle is given here as 3 degrees.
It was also observed that the parting line of cavity should coincide with the parting surface, to obtain a good quality part model.
At centre of the bumper and the end boundary of the bumper, it was observed that the sweep model is generated without providing draft. i.e., instead of using ‘with draft analysis’ command, I selected the option, ‘with reference surface’, and thus created a parting surface at 90 degrees. Those figures also Iam referring below. Please look into it.
Parting surface perpendicular to the tooling axis
Parting surface perpendicular to the tooling axis
Thus, drafting analysis made on a closed surface after final trim of class- A & C with class B surface. During draft analysis, initially the compass have brought and coincided with main tooling axis. Now, once again the compass option have clicked and moved from the main tooling axis and once again coincided with the same axis. So that the created closed surface is turned into green colour by clicking the mouse pointer on the surface and selecting the inverse draft option. Now, here at 3 degrees, some portion of the closed surface is red, so the value from display which represents 3 degrees is changed to 2.5 degrees. 2.5 degrees is also well suitable for manufacturing the component for some complicated shapes like bumper.