Abstract

A mechanical press is used for pressing of sheet metals to give it the desired shape. Mechanical press is a machine that changes the shape of the work piece by applying tones of load on it for accurate output. Mechanical punch presses fall into two distinct types, depending on the type of clutch or braking system with which they are equipped. Generally older presses are "full revolution" presses that require a full revolution of the crankshaft for them to come to a stop. This is because the braking mechanism depends on a set of raised keys or "dogs" to fall into matching slots to stop the ram. It is a 1200T mechanical press. It consists of a ram, upper die, lower die and cushion. For pressing upper die is pressed on sheet metal and lower die. At that time the cushion gets activated and it holds the lower die. The cushion is supported by hydraulic and pneumatic pressure. The press is a try-out press. It requires pressure up to 7 bar. The pressure provided by the company compressor is 5bar. To increase the pressure there are two options. One is to use compressor for which we have to compress air from atmospheric pressure. So it will consume more power. Moreover the space required for it very large. The another option available for it is to use a compact and power saving device. Such a device is called booster. A booster is a double acting cylinder. It has two chambers. One chamber has bigger area which consist of piston end. Another chamber has small area and it consists of rod end. Large force is applied to piston end by pressurized air. This force is transmitted to rod end of piston. The area at this end is small and hence the air at this end is compressed to very high pressure. Thus pressure rise is obtained.