Week 9 - Attachment Feature Creation - Challenge 2
AIM:
To Create A Attachment feature DOGHOUSE for given CAT Part Class A Surface to find B&C Surface attach wiith Engineering feature of Plastic Door trim lower component.
Used via
Catia V5 software- tools used given below,
- Point through on the centre of surafce
- Axis creation
- Line in point direction
- Bisectecting line
- Intersection
- Tool Axis
- Draft Analysis in Free from Analysis
- Untrim
- boundry
- extract boundry
- multiple extract boundry
- Extraploate
- Offset
- Trim
- Join
- Sweep command purticularly with draft direction
- blend
- fill surface
- Extruded surface
- multisection surface
- Fillet
- Closed Surface
- Thicken surface
- Pad
- Draft
- Fillet
Tooling Axis creation:
It is defined as the direction in which the mould/core and cavity open.Then resultant tooling axis is created using the bisecting method.
Selection of the direction of the tooling axis depends on the ease at which components can be easily ejected.
By analysing the component the most easily ejectable direction is somewhere close to the Z direction,(might be inclined to it) so we have made a sketch on the YZ plane of Axis System) to create a bisecting line considering the 2 faces which might be difficult to be tooled.
Taking the Thickness of the component to be 2.5 mm.
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 automotive 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.
Dog House Design-
Dog house is an engineering feature used in plastic trim design. Dog houses are used as supporting feature. Dog house is a feature that helps you to avoid sink marks.
Rules-
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Dog house wall thickness and sink saver-
“C” is where doghouse contacts backside of surface.
Dog house wall thickness at intersection of part wall (C) should be 40% or less than main wall stock (T).
Height of (B) should be between 3.0 – 6.0 mm.
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Dog house height-
Minimum height (H) of dog house is 6mm.
Less than 6mm causes weak steel condition.
3:1 ratio of steel width to height, 2:1 is preferred.
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Dog house width-
Minimum dog house width (X) for doghouse is 12mm.
3:1 ratio of steel width to height, 2:1 is preferred.
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Dog house draft to die draw-
Minimum draft (D) for dog houses 1.5 degree to die draw.
If a slide is being considered, this requirement can change to 3 degrees minimum.
SURFACE-A:
TOOLING AXIS:
DRAFT ANALYSIS A surface:
SURFACE-B:
SURFACE -C:
FINAL COMPONENT WITH DOGHOUSE ATTACHEMNT FEATUURE:
DRAFT ANALYSIS FINAL COMPONNET:
ORIENTATION:
