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Attachment Feature Creation (Dog House) Aim 1 - Create the Dog House for the Door Trim considering the design rules. Introduction 1 - Dog house is an engineering feature used in plastic design. Dog houses are used as a support feature. Sometimes other engineering features like snaps, locators, and screw bosses are…
Neeraj Singh
updated on 10 May 2024
Attachment Feature Creation (Dog House)
Aim
1 - Create the Dog House for the Door Trim considering the design rules.
Introduction
1 - Dog house is an engineering feature used in plastic design. Dog houses are used as a support feature. Sometimes other engineering features like snaps, locators, and screw bosses are mounted on them to increase their strength.
2 - Dog houses are subjected to draft analysis to prevent breakage of the component during ejection from the mold cavity. Dog house and other engineering components are built on the B-surface.
Purpose Of Dog House
1 – Use to avoid sink mark.
2 – Solve the Length Issue – If we need long screw boss then be use dog house for solve strength issue and assembly issue.
3 – Dog house is use to create screw boss which is away from the surface & use to create screw boss which is perpendicular to the tooling axis.
Objective
1 – Learn about design consideration of dog house.
2 – Learn about creating tooling axis for dog house.
3 – Learn about surface commend to create dog house.
4 – Learn about creating draft for dog house.
5 – Learn about draft analysis for dog house.
Dog House Design
Design rules for Dog house creation
"C" is where the doghouse contacts the backside of the surface
Doghouse wall thickness at the intersection of the part wall (C) should be 40% or less than the main wall stock (T).
The height of (B) should be between 3.0 – 6.0 mm
Steps follows
1. Check the connectivity of the class A, ensuring that no gap between two surfaces.
a) Using Join command
b) boundary command – to check the boundary of the A surface
2. Find the tooling axis of the component
a) Tooling axis is the direction at which the mold open & core & cavity opens.
b) Analysis the component & find which is the best tooling direction (X, Y, Z)
3. Draft analysis (Insert – Analysis – Feature Draft Analysis)
4. Create B Surface
5. Create C Surface
6. Join A Surface with B, & C Surface & create a closed Surface.
7. Using close surface command Create Solid Part.
A Surface is the surface that is created by the concept sketches made by free hand sketchers. this computerized design is known as Class A surface.
B Surface is created by using class A surface, and the distance between A surface and B surface is equal to the thickness of the part, it is also called engineering surface.
C Surface is created for connect Class A and Class B surface also known as the side wall of the surface.
Close Surface
Tooling axis
Tooling axis is the direction at which the mold open & core & cavity opens.
Analysis the component & find which is the best tooling direction (X, Y, Z)
Draft analysis
Draft analysis is done to see the manufacturability of a part, green color indicates that all parts are clearing when core is removed from cavity.
The part has fully constrained like.
1. It does not have any negative draft.
2. How does the part behave.
3. What is going to the constrain whether it is maintain the same radios.
4. You don’t have any undercut in part, you have maintained 2.5 plus thickness radius.
5. You have minimum hold requirement Gap.
Command used in CATIA
1. POINT
2. LINE
3. PLANE
4. INTERSECTION
5. EXTRACT
6. UNTRIM
7. EXTRAPOLATE
8. TRIM
9. OFFSET
10. EDGE FILLET
11. BOUNDARY
12. SWEEP
13. JOIN
14. CLOSE SURFACE
15. DRAFT ANALYSIS
16. PUBLICATION
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