Week 4:- Pin Unit Design Challenge

report on fixed pin unit.

the fixed pin units are generally designed for guiding into the holes of the part .the fixed pin units designed for BIW fixture generally has the following components in it like.The round pin,pin guide,blade,riser etc.

1.location decision.

the location is decided where to place the pin so that the movement is arrested.the pin type may be round or diamond shaped.The round pin is generally used to arrest the degree of freedom of the part.the location points of the hole are decided accordingly.

2.pin selection.

The pin can be generally round or diamond type.according to the hole.

3.constraints.

the constraint in the geometry are analysed so that the unit is accurately fitted.and dimensions are properly matched.

4.approach.

the top down approach is selected so pin is designed first then the remaining components are designed accordingly by going by top down approach.

5.dimension selections.

the pin size is selected according to size of the hole.the pin is placed 2 or 3 mm above the datum point.the pin retainer is used to place the pin accordingly.

6.The l block.

the block allows two way adjustment for placing the pins the pins movement is generally guided by the shims.

7.retractor cylinder.

The retracting cylinder is generally attached to the pin for the movement of the pin.

8.Blade.

The blade is generally used as arrangement for joining placing L plate with the riser.

9.Riser.

The riser is used as mounting base for the whole assembly onto it.