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PIN UNIT DESIGN - OBJECTIVE - 1) Design two different types of fixed pin unit with different pins , pin retainers , blocks , blades , risers . 2) Design two different types of retractable pin unit with different pins , pin…
Franky Dsouza
updated on 12 Apr 2021
PIN UNIT DESIGN -
OBJECTIVE - 1) Design two different types of fixed pin unit with different pins , pin retainers , blocks , blades , risers .
2) Design two different types of retractable pin unit with different pins , pin retainers , blocks , blades , risers .
INTRODUCTION -
Fundamentals of pin unit design -
It is necessary to locate car panel with two pins . one pin to restrict 4 way motion (4 translational ) and one pin to restrict 2 way motion (2 rotational ) .
There are two types of pin units -
1)Fixed pin unit -
Fixed pin unit is a unit designed to locate the car panel using pins .
2)Retractable pin unit -
A retractable pin unit is designed to locate the car panel using pins , but the entire pin package is mounted in the retractable cylinder . the cylinder will move the unit up and down .
Below are the parts included in the pin unit -
1 . Pin -
2 . Pin retainer -
3 . Blocks/ L blocks -
4 . Shims/ spacer -
5 . Blade -
6 . Riser -
7 . Dowel holes / machined surface -
DESIGN METHODOLOGY -
Input - This is the surface body for which we have to prepare the BIW fixture . the thickness of the part is 1mm .
As we can see from above image , we have placed the locating pins in the two circular holes . one pin is circular which will arrest the 4 translational motion of the workpiece and other pin is diamond pin which will arrest 2 rotational motion of the workpiece .
1) Fixed pin unit -
2) Retractable pin unit -
CONCLUSION -
So we have designed two types of pin fixed pin units and retractable pin units that will locate the workpiece properly .
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