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Chapter: Mechanical : Computer Aided Design : Assembly of Parts

Assembly modeling of Parts

Assembly modeling is a combination of two or more components using parametric relationships.

ASSEMBLY MODELING OF PARTS

 

 

         Assembly modeling is a combination of two or more components using parametric relationships.

 

         Typically a designer would start with a base part

 

         Add other components to the base part using merge commands.

 

 

Assembly Tree


Exploded view

 

An exploded view consists of series of steps. One can create steps by selecting and dragging parts in graphical area.

Example - Assembly of Pulley block



Bottom-up assembly approach - :

 

         Allows the designer to use part drawings that already exist (off the shelf)

 

         Provides the designer w ith more control over individual parts

 

         Multiple copies (instan ces) of parts can be inserted into the assembly

 

Top-down assembly approach - :

 

         The approach is ideal for large assemblies consisting of thousands of parts.

 

         The approach is used to deal with large designs including multiple design teams.

 

         It lends itself well to t he conceptual design phase

 

         E.g. :

 

         Piping and fittings

 

         Welds

 

         Lock pins

 

Degrees of freedom -:


Translation – movement along X, Y, and Z axis

         Rotation – rotate about X, Y, and Z axis

 

Mating conditions -:


Assembly Constraints

 

         Constraints can be used to create permanent relationships between parts

 

         THEY use the same commands as 2D constraints

 

         Typical constraints:

 

–   two faces meet

 

–   axes coincident

 

–   two faces parallel at fixed distance


Assembly sequence affects

 

       difficulty of assembly steps

 

       need for fixture

 

       potential for parts damage during assembly and part mating

 

       ability to do in-process testing

 

       occurrence of the need for reworking

 

       time of assembly

 

       assembly skill level

 

       unit cost of assembly

 


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Mechanical : Computer Aided Design : Assembly of Parts : Assembly modeling of Parts |


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