Week 5:- Rest Unit & Clamp Unit Design Challenge

1. Design 3 Different types of Power Clamp Unit with Different Riser, Blade and Clamp Arm for the given Car Panel.

2. Design 2 Different types of Rest Unit for the given Car Panel.

AIM

To design a different types of Power Clamp Unit with Different Riser, Blade and Clamp Arm and Rest Unit for the given Car Panel.

INTRODUCTION AND THEORY

This project is to design 3-power clamp units and 2-Rest units put together with 2-Pin units completely clamps the panel in order to fix it in fixed position. This project is done with respect to 3-2-1 principle, considering clamp force to be imposed on panel according to Tunkers.

CLAMP UNIT

A clamp unit is a unit designed to clamp/hold the car panel with NC blocks/Mylars/rest by using a pneumatic cylinder. Clamp arm, finger, Rest/backup, L-block, shims, riser, pneumatic cylinders are the typical parts of clamp unit. Clamping force should be considered while designing clamp unit. Usually clamp open position is 90. Fingers are attached to clamp Mylar. In Clamp unit shim to one side is more enough because it will restrict translation motion in upward direction and downward direction only. There is another type of clamp unit known as swivel type. There is pivot pin around which clamp arm rotate.

REST UNIT

Rest unit is unit designed to support car panel using Mylar/ NC block/ rest component is rested only, no upper clamp or force applied there. It is the simplest unit to design because it has fewer parts to design & the purpose is only resting of the car panel.

Because of the simplicity the rest unit is combined with other unit to reduce the cost of the overall project. It can be combined with clamp unit to clamp as well as to rest the car panel. It can be combined with locating unit to locate as well as to rest the car panel. Also locating, clamping & Test unit can be combined together in one unit to reduce cost.

There is no cylinder attached to it. It has rest Mylar, blade and riser & below is different parts of rest unit. Rest unit is also divided into simple support unit, multiple support units & retractable support unit.

3-2-1 PRINCIPLE

Our ultimate intention for using pin unit is to fix the work piece so that it does not deviate from the position while the operation is being performed on it. For this reason we use 3-2-1 principle.

Every component we know has 6 degrees of freedom. They are listed below:

• Translational motion along x-axis.
• Translational motion along y-axis.
• Translational motion along z-axis.
• Rotational motion along x-axis.
• Rotational motion along y-axis.
• Rotational motion along y-axis.

If we fix the clamps as per the 12 degrees of freedom listed above, then we can arrest the panel in a fixed position.

• 6-degrees of freedom are restricted by 2-pin units.
• 6-degrees of freedom are restricted by 3-clamp units and Rest units.

GIVEN PRODUCT

STANDARD SHIMS USED

SHIM PACK ASH4N

SHIM PACK ASH3

DESIGN PARTS

CLAMP UNIT 1

RISER

CLAMP MYLAR

REST MYLAR

CLAMP UNIT 2

RISER

CLAMP MYLAR

REST MYLAR

CLAMP UNIT 3

RISER

CLAMP MYLAR

REST MYLAR

REST UNIT 1

RISER

BLADE

REST BLOCK

REST UNIT 2

RISER

REST BLOCK

CLAMP OPEN CONDITION

CYLINDERS USED

FINAL OUTPUT

DESIGN TREE

CONCLUSION

Hence, The design a different types of Power Clamp Unit with Different Riser, Blade and Clamp Arm and Rest Unit for the given Car Panel.