Tool Design Da2.docx

NAME – PRANAV SINGH REG. No.- 16 BME 1011 DIGITAL ASSIGNMENT No.-02 (TOOL DESIGN)

Topic :- Double wishbone In automobiles, a double wishbone suspension is an independent suspension design using two (occasionally parallel) wishbone -shaped arms to locate the wheel. Each wishbone or arm has two mounting points to the chassis and one joint at the knuckle. The shock absorber and coil spring mount to the wishbones to control vertical movement. Double wishbone designs allow the engineer to carefully control the motion of the wheel throughout suspension travel, controlling such parameters as camber angle, caser angle, toe pattern, and roll center height, scrub radius, scuff and more. The double-wishbone suspension can also be referred to as "double Aarms", though the arms themselves can be A-shaped, L-shaped, or even a single bar linkage. A single wishbone or a-arm can also be used in various other suspension types, such as variations of the McPherson strut. The upper arm is usually shorter to induced negative camber as the suspension jounces (rises), and often this arrangement is titled an "SLA" or "short long arms" suspension. When the vehicle is in a turn, body roll results in positive camber gain on the lightly loaded inside wheel, while the heavily loaded outer wheel gains negative camber.

Work piece A-arm / control arm In automotive suspension, a control arm, also known as an A-arm, is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel. The main work of a a-arm is to control camber angle in static as well as in dynamic condition. a-arm are of two types upper and lower in lower a- arm shock is mounted and its going to take maximum load in the system. While in upper a-arm no shock is mounted therefore load are very less as compared to lower a-arm.

Laser cutting Laser cutting is a technology that uses a laser to cut materials, and is typically used for industrial manufacturing applications, but is also starting to be used by schools, small businesses, and hobbyists. Laser cutting works by directing the output of a high-power laser most commonly through optics. Laser cutting tolerances Cut width can be extremely small with laser cutting, less than 0.001 inch, and dimensional accuracy is extremely precise, at about ± 0.0005 inch. This accuracy is very useful for producing the jagged teeth used in some cutting tools.

The result is an edge with no oxide layer or burr. However, this process is somewhat limited in the material thickness it can cut. With a 4,000-watt laser, 3/8-inch-thick carbon steel usually is the maximum practical thickness; with a 6,000-watt laser, material thickness can be increased to 1/2 inch. The laser can cut or etch. The materials that the laser can cut materials like wood, paper, cork, and some kinds of plastics. Etching can be done on almost anything, wood, cardboard, aluminum, stainless steel, plastic, marble, stone, tile, and glass.

Locating device

These will help us to locate the tubes at correct position. To maintain dimensional accuracy and angles.

Material selection We had selected stainless steel for fixture material because its cheap as compared to aluminum and had a longer life span as compared to other steels (rusting)

Manufacturing procedure We used laser cut files with a semi-circular notch on it to locate the tubes of the a-arm. Then we weld the laser cut files on the base plate which has slots in it to ensure correct position of the files. We need to make sure that the files are places on its correct position to confirm the dimensional accuracy.