Challenge

Week 5:- Rest Unit & Clamp Unit Design Challenge

SSrikanth Chikkam3 Nov 2020

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 3 Different types of Power Clamp Unit with Different Riser, Blade and Clamp Arm for the given Car Panel and 2 Different types of Rest Unit for the given Car Panel.

Introcution:

Clamp unit: Clamp unit is unit designed to clamp / hold the car panel with NC blocks/ mylar/ rest by using a pneumatic clamp cylinder & below are different parts of a clamp unit in general. 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 & downward direction only. There is another type of clamp unit knows as swivel type. There is pivot pin around which clamp arm rotate.

clamp unit

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 this simplicity the rest unit is combined with other unit to reduce the cost of the overall project.

rest unit

Theory:

3-2-1 principle achievement:

3-2-1 principle is basis of any fixture design. Holding fixtures used in assembly operations often follow a 3-2-1 locating scheme to position parts. Under this scheme, three locators position a part in a primary plane or direction (e.g., high/low).

(3) minimum: Three locator blocks to establish part plane. Three locators or supports are placed under the workpiece. Three locators are usually positioned at primary locating surfaces. This restrict two translation motion i.e. upward & downward & four rotational motion ( i.e. clockwise or anticlockwise). Together tree locators with clamp restrict six degrees of freedom. Below figure shows how (3) minimum in 3-2-1 locating scheme achieved by clamping & resting

Designs of clamp & rest unit: