Design and Fabrication of Power Hammer Using Crank and Lever MechanismDescripción completa
Design and Fabrication of Power Hammer Using Crank and Lever Mechanism
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Design and Fabrication of Rack and Pinion Lift
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DESIGN AND FABRICATION OF POWER HAMMER USING CRANK AND LEVER MECHANISM ABSTRACT: Power hammers are mechanical forging hammers that use a non-muscular power source to raise the hammer preparatory to striking, and accelerate it onto the work being hammered. A typical power hammer consists of a frame, an anvil, and a reciprocating ram holding a hammer head. The workpiece is placed on the lower anvil and the head or upper head strikes the work piece. The present project work is a design and fabrication of POWER HAMMER. This machine is used to break a brick into small pebble size. This project involves the process of designing a power hammer by using crank and lever mechanism. This project is mainly about generating a new concept of breaker that would make the work easier and reduce the work of man power. The sole purpose of this project is to understand the fundamental knowledge of crank and lever mechanism. POWER HAMMER INTRODUCTION: Smithy certainly perform very well so far as the hand- forging is concerned, but their use for satisfactory production is limited to small forging only. It would not be difficult to understand that the intensity of blows, however great one may try to achieve through hand hammering, will not be sufficient enough to affect the proper plastic flow in a medium sized or heavy forging. For this, a power hammer is usually employed. The capacity of these hammers is given by the total weight of their falling parts i.e., ram and die. A 200 kg hammer will be one of which the falling parts weigh 200 kg. The heavier these parts and greater the height from which they fall. The higher will be intensity of blow the hammer will provide. Power hammers in common use are of different types e.g. Spring power hammers, pneumatic power hammers, Steam hammers and Drop or Forge hammers and six bar slider crank power hammers. CRANK AND LEVER MECHANISM: In a kinematic chain when one link is fixed, then that chain is known as mechanism. It may be used for transmitting or transforming motion for example engine indicators, typewriters etc. A mechanism which has four links is known as simple mechanism, and a mechanism which has more than four links is known as complex mechanism. A
mechanism which is required to transmit some particular type of work is knows as machines. In certain cased the elements have to be designed to withstand the forces safely. A mechanism is a kinematic chain in which kinematic pairs are connected in such a way that first link is joined to the last link to transmit a predetermined constrained motion. The various parts of the mechanism are called as links or elements. When two links are in contact and a relative motion is possible, then they are known as a pair. An arbitrary set of a link which forms a closed chain which is capable of relative motion and that can be made into a rigid structure by adding a single link is known as kinematics chain. To form a mechanism from a kinematics chain one of the link must be fixed. The technique obtaining different mechanism by fixing the various link in turn is knows as inversion. 2D LAYOUT: