CATIA-Week 9 - Project - A pillar Design with Master Section

AIM:

        To create A Pillar Design with provided master section with class A surface, create the tooling axis, engineering features(Dog House) and perform the draft analysis for the final solid part. 

OBJECTIVE:

• To construct a tooling axis by using master section with bisecting method
• To create class-B and class-C surface and make closed surface
• To make sure that the model meets the design rules and master section sketch for dog house creation
• Perform draft analysis on the final component

DESIGN METHODOLOGY:

  1. TOOLING AXIS CREATION-

         The Tooling Direction is basically the direction that the mold pulls a part. The mold is built in two separate pieces, basically. You have a Cavity side and you have the Core side. The Core pulls apart from the Cavity and that's the Dye line or the Tooling Direction.

• Open the given CAT part file.

• Check for gaps between surfaces for that click on join and then preview.
• If theres any gap between the surfaces join them with a maximum tolerance of 0.003 mm.
• Extract the sides of dog house of master section by drawing line on the edges .
• create a line bisecting both the edges from the point between both the edges.
• the line created bisecting both the lines is our main tooling axis as shown below.

• The tooling axis is created for the component.

2. PUBLICATION

• Publication is done to the component to make it visible and navigate easily.
• To publish the component go to tools > publications and then select the tooling axis and the class A surface.
• A separate tree structure is formed under the main part.

 3. DRAFT ANALYSIS

          The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on color ranges identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specified values.

• Before going to drat analysis go to customized view parameter >under mesh >check material and then click ok.
• Now for draft analyses go to insert » analysis » feature draft analysis.
• Use the compasss to define the draft direction.
• In the colour scale change the draft angle to 3 degree.
• The component changes to green in indication of passing draft angle.
• Use running point to check the angle on the component.

• The draft analysis is complete.

4. CREATING CLASS B SURFACE

• Offset the surfaces to 2 mm to create the thickness
• Check whether all the surfaces are properly offsetted.
• While offseting class A surface one of the patch not formed properly.

• One corner does not offsetted, will be created with multi-section command.
• Join all the surfaces together and class B surface will be created.
• While triming with the class c surface some of parts not getting coinside, will extrapolate 4mm with selecting the outer boundary.

  5. CREATING CLASS C SURFACE

• Extract the boundary from the class A surface using boundary command.
• Using disassemble tool to divide the boundary as the boundary contains domains.
• Use sweep command > choose profile type line > subtype as with draft direction > choose guide curve and draft direction > draft angle as 3 degree > preview.

• After getting sweep then trim the output with class B surface to get final output.

• Now open part design workbench and using close body surface create a solid of the component.

6. B SIDE FEATURES CREATION

Engineering Feature Dog House-

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

• 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 B-surface.

CREATION OF DOG HOUSE:

DRAFT ANALYSIS ON A PILLAR WITH TOOLING AXIS-

DRAFT ANALYSIS ON DOG HOUSE WITH SIDE CORE AXIS-

3D MODEL-

CONCLUSION:

• The A pillar design with provided master section with class A surface is done sucessfully
• Created the tooling axis and perform the draft analysis for the class A and final solid part.
• Created dog house and perform draft analysis. walls of dog house not getting cleared in draft analysis, need to provide draft of 0.5 degree in side core axis and 1.5 degree in die draw (if a slide being considered this reqirement can be changed to 3 degrees)