Advanced Sheet Metal Design Using NX Cad Challenge_8_Flattening and Forming

TITLE- FLATTENING AND FORMING OF METAL BRACKET-II USING NX_CAD.

AIM: WE ARE DOING FLATTENING AND FORMING OPERATION IN THE METAL BRACKET II USING NX_CAD.

INTRODUCTION: NEUTRAL DATA FILE FORMAT COMES UNDER CAD DATA EXCHANGE, SO CAD DATA IS USED TO EXCHANGE THE INFORMATION BETWEEN DIFFERENT TYPES OF DESIGNING SOFTWARE.

DRIVING FORCE OF CAD AND CAM DATA

• Fundamental incompatibilities among entity representations.
  
• Complexity of cad and cam system.
• The varying requirement of users.
• Restrictions on access to proprietary database information.
• Rapid pace of technological change.

Requirements for the Exchange
• Shape data: Both geometric and topological information,part or form features. Fonts, color, annotation are considered part of the geometric information.
• Non-shape data: graphics data such as shaded images, and model global data as measuring units of the databaseand the resolution of storing the database numerical values.
• Design data: information that designers generate from geometric models for analysis purposes. Mass property and finite element mesh data belong to this type of data.
• Manufacturing data: information as tooling, NC tool paths, tolerancing, process planning, tool design, and bill of materials (BOM).

STANDARD NEUTRAL DATA FORMAT

INITIAL GRAPHIC EXCHANGE INFORMATION (IGES) -THE MOST POPULAR FORMAT OF THE NEUTRAL FILE SUPPORTED BY ALL CAD/CAE/CAM system and defined by ISO.

DRAWING INTERCHANGE FORMAT (DXF)- CREATED BY AUTODESK AND CREATED FOR THE EXCHANGE OF THE DRAWING SHEET

STANDARD FOR THE EXCHANGE OF PRODUCT MODEL DATA (STEP)- IT IS USED TO STORE ALL THE RELEVENT DATA TO THE ENTIRE LIFE CYCLE OF THE PRODUCT. INCLUDING DESIGN, ANALYSIS, MANUFACTURING, QUALITY, ASSURANCE, TESTING IN ADDITION TO THE SIMPLE PRODUCT DEFINITION DATA, THE DATA FORMAT WAS ALSO CALLED PDES (PRODUCT DESIGN EXCHANGE SPECIFICATION) AT THE EARLY STAGE OF DEVELEPOMENT OF NORTH AMERICA.

CAD SYSTEMS WHICH USED TO SUPPORT IGES FORMAT ARE MOVING TOWARDS THE USE OF STEP.

• IGES (Initial Graphics Exchange Specification)
• First developed by National Institute of Standards and Technology (NIST) in 1980.
• Then adopted by the American National Standards Institute (ANSI) in the same year.
• Exchanges primarily shape (both geometric and topological) and non-shape data, which is referred as CAD-to-CAD exchange.
• Codes a superset of common entities of all CAD/CAM systems to facilitate the translation between various systems.

LIMITATIONS OF IGES AND DXF.

EVEN THOUGH THE SPECIFICATION OF THE IGES OR DXF FILE HAS BEEN BRODENED TO ENCOMPASS SOME OF THESE PRODUCT DATA THE DATA CARRIED BY THOSE FILES ARE INHERENTELY INSUFFICIENT TO BE THE PRODUCT DATA SUPPORTING THE ENTIRE LIFE CYCLE.

Possible Information Loss

• Like any language translation, there is always information loss during the product data information translation

Examples
– A design tolerance is captured as a text string placed on a drawing, its meaning, as well as its numerical value, are lost.

– Circular cylinders (a hole) is represented by NURBS; milling vs. drilling

– Offset surfaces; the offset info is lost.

• Integrated CAD/CAE/CAM packages

STEP BY STEP PROCEDURE

MODEL 8A

1- CONVERT THE NX_METALBRACKETII_TUSHAR IN STEP FILE FORMAT AND OPEN IN THE NX CAD HERE YOU CANNOT SEE THE OPERATION WHAT YOU DONE IT IN THE PART NAVIGATOR

2- DO FLATTENING AND FORMING OPERATION IN ORDER TO DO ANY OPERATION IN YOUR SHEET MODEL

3-USE THICKEN COMMAND IN ORDER TO GIVE THE THICKNESS TO THE FACE

MODEL 8B

OPEN ALREADY EXISTING FILE UNDER NX_METALBRACKET_TUSHAR

USE EXTRACT GEOMETRY COMMAND IN ORDER TO EXTRACT THE FACE OF THE MODEL

USE FLATTENING AND FORMING COMMAND IN ORDER TO MAKE EXTRA FEATURE IN THE SHEET MODEL.

CREATE SKETCH IN THE FACE OF THE FLATTENING AND FORMING MODEL

USE FORMING AND REUSE OPTION OF FLATTENING AND FORMING COMMAND IN ORDER TO GET BACK TO THE ORIGINAL SHAPE

USE TRIM SHEET IN ORDER TO CREATE THE HOLE

LAST THICKEN THE MODIFIED EXTRACTED FACE