19-01-2013, 04:41 PM
FABRICATION OF HIGHSPEED RECIPROCATING HACKSAW MACHINE
FABRICATION OF HIGHSPEED RECIPROCATING.docx (Size: 301.82 KB / Downloads: 314)
INTRODUCTION
The hacksaw is the metal cutting machine tool designed to cut metal by applying pneumatic pressure. The machine exclusively intended for mass production and they represent fasten and more efficient way to cut a metal.
Hacksaws are used to cut thin and soft metals the operation of the unit is simplified to a few simple operations involving a cylinder block and piston arrangement.There are numerous systems in hacksaw machine .the main function of pneumatic hacksaw is to cut thin and soft metals by pneumatic power.
LITERATURE REVIEW
PNEUMATICS:
The word “pneumatics” originates from greek word (pneuma) which in turn originates from (pneuma) meaning air organ which in turn comes from (pneuma greek for air).
Pneumatic is a huge topic of science and engineering dealing with the mechanical properties of air and the therotical foundation for pneumatics which focuses on engineering uses of air properties, pneumatic topics range through. It is a branch of technology, which deals with the study and application of pressurized gas to effect mechanical motion. Pneumatic systems are extensively used in industry, where factories are commonly plumbed with compressed air or compressed inert gases. This is because a centrally located and electrically powered compressor that powers cylinders and other pneumatic devices through solenoid valves is often able to provide motive power in a cheaper, safer, more flexible, and more reliable way than a large number of electric motors and actuators. Pneumatics also has applications in dentistry, construction, mining, and other areas.
Pneumatic systems are widely used systems in industry. While they are used widely in the industry, the system components like pumps, valves, cylinders are always became investigation topics in the history. Pneumatic cylinders are one of the most common components of the pneumatic systems used in many engineering applications like; automatic manufacturing and montage lines, heavy construction equipments, control systems, sensitive measurement and test systems. They are used for producing linear motion in the pneumatic systems and they convert pneumatic energy to mechanical energy.
Most science and engineering disciplines and cover concepts such as pipe flow dam design air and air control, computional fluids called dynamics.flow measurment ,river channel ,behaviour and erosion ,however if used incorrectly ,pneumatic instrument can result in weird occurrences because of the nature of high pressured air .
PNEUMATIC POWER:
Pneumatic pressurised airs are a large group of air used as the motive medium in pneumatic machinery. Air types include synthetic compounds of air and the mixtures .The air are found in machinery and equipment.to back holes , pneumatic systems are very common in aircraft flight control systems air is medium of power transmission in a pneumatic systems.
SELECTION OF PNEUMATICS:
Mechanization is broadly defined as the replacement of manual effort by mechanical power. Pneumatic is an attractive medium for low cost mechanization particularly for sequential (or) repetitive operations. Many factories and plants already have a compressed air system, which is capable of providing the power (or) energy requirements and the control system (although equally pneumatic control systems may be economic and can be advantageously applied to other forms of power).
The main advantage of an all pneumatic system are usually economic and simplicity the later reducing maintenance to a low level. It can also have out standing advantages in terms of safety.
OXIDATION STABILITY:
Oxidation is taken place due to chemical action between oil and oxygen when oxidation of air take place impurities like dusts, moistures, dirts, etc.oxidation stability is defined as the air is ability to resist oxidation.complete preventation of oxidation is impossible but it can be reduced.
PRODUCTION OF COMPRESSEDAIR:
Pneumatic systems operate on a supply of compressed air, which must be made available, in sufficient quantity and at a pressure to suit the capacity of the system. However it wills indeed the necessary to deal with the question of compressed air supply.
The key part of any facility for supply of compressed air is by means using reciprocating compressor. A compressor is a machine that takes in air, gas at a certain pressure and delivered the air at a high pressure.Compressor capacity is the actual quantity of air compressed and delivered and the volume expressed is that of the air at intake conditions namely at atmosphere pressure and normal ambient temperature.