CATIA-Surface Check Tools

http://www.cadfamily.com/downinfo/298663.html The case study for this lesson is the Surface analysis of a plastic component. The focus of this case study is to analyze the geometric connections between the surfaces using different surface analysis tools. you will analyze the surface for its moldability using draft analysis tool. You will be given a set of CATIA V4 data, your goal is to make the part available for manufacturing . You will be checking surface discontinuities and heal the surface and rectify the negative drafts to achieve the extraction of the part from the mold.The focus of the case study in this lesson is to understand, how to check and rectify the surface connections.

MESDesign Intent Check the surfaces for the gaps to ensure the easy machinability. Use surface connect checker. Check the surface for tangency and curvature continuity. Use the Tangent and Curvature analysis options of surface connect checker. Check the draft on the surface for better extraction of the partfrom the mold.. Use draft analysis tool to measure the draft angle on the part features. Heal the discontinuities between the surfaces. Use the heal tool to rectify the gaps and continuities between the tools. Replace the undercut faces by positive draft angle. Create the drafted surface using suitable surface creation tool and replace the defective surface.The intent is to check the given V4 data for its surface connections and analyze the draft on the surface for its better moldability.

Stages in the ProcessThe following steps are used to perform the case study: Check the surface for surface gaps Check the surface for tangency discontinuities Check the surface for curvature discontinuities Perform the draft analysis. Heal the surface from discontinuity problems. Replace the undercut defective surface by a drafted surface
Why Do We Check Surface continuity? (1/2)Surfaces generated in CATIA V5 are likely to be good continuity surfaces. Surface continuity should mainly be checked when you work with surfaces that are not created in CATIA V5. When Surfaces from CATIA V4 or other CAD packages are imported into CATIA V5, there could be some loss in geometry. All the surfaces may or may not get imported into CATIA V5, or may contain some deficienciesafter import.So, you need to perform surface connection analysis between these surfaces, to check whether these surfaces are connected togetherwith desired continuity and have no gaps between them. Also, when you use imported surfaces as parents to create new V5surfaces, you need to ensure that there is smooth transition between these surfaces and there is no abrupt change or bump during transition by performing surface continuity checks.
Copyright DASSAULT SYSTEMESWhy Do We Check Surface continuity? (3/3)In an integrated CADD and Manufacturing system, the surfaces used to build the design models are processed at different stages of product development. The surfaces are used in prototyping, NC path generation, manufacturing, Quality assurance and finally Production. The continuity of the surface has an impact over all these stages. Lets take an example of a bad surface (having discontinuities) of automotive panel or a molded part surface being processed in manufacturing stream line.GSDDie\Tool DesignsTool Path GenerationMachining \ ManufacturingComponent ProductionSurface with discontinuities when down streamed to die \ product design Tool\ Die design done using the bad surface affects the tool dimensions and leads to mismatches. The tool follows the irregularities/Discontinuities of the surface and leads to undesirable surface finishDue to a irregularities of the surfaces the tool may tend to Gouge in to the steel.The design and actual part may not match due to the cumulative affect of the bad surface along the process of development.Thus, it is very important to check the continuity of the surface in any design. User has to understand the down stream applications of the surface and use proper tools to analyze the surface continuity.Step 1: Surface continuity Check