25-10-2016, 10:32 AM
1460982435-HIGHSPEEDFOURWAYHACKSAWMACHINEBYSANJEEV.docx (Size: 3.6 MB / Downloads: 10)
1. INTRODUCTION
In present condition many electrically operated power hacksaw machines of different companies with different specifications are available for the use in shop floor. These machines are so precise that they can cut metal bars with minimum time made up of different materials but they have one and major disadvantage that those are able to cut single piece of bar at a time. For industries to achieve the mass production, it is necessary to cut metal bars with high rate. So it is impossible to depend upon conventional single frame power hacksaw machines and need the improvement in technology and design of such machines. With the help of this multi-way power hacksaw machine the four metal bars can be cut simultaneously to get high speed cutting rate and to achieve mass production for maximum profit in related companies. As this machine overcomes all the limitations and drawbacks of conventional hacksaw machines, it is also helpful for small scale industries due to its simple working and operating conditions along with its compatibility, efficiency and affordable price.
This project is about cutting the wood, metal, pipe, angle, channel, flat plates, rods and such other things. This project is very much useful and easy to install by user.
1.1 Scotch Yoke Mechanism
Scotch yoke is a mechanism for converting the linear motion of a slider into rotational motion or vice-versa. The piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part. The shape of the motion of the piston is a pure sine wave over time given a constant rotational speed.
Construction
The scotch yoke mechanism is constructed with iron bars. Here the crank is made in some length and the yoke is also made using the same material. It is noted that the minimum length of the yoke should be double the length of the crank. The crank and yoke is connected with a pin. Iron bars are welded to both sides of the yoke to get the reciprocating motion. The yoke with the iron bars is fixed on the display board with the help of c clamp. Now the crank is welded to the end of the shaft of the motor. Now the pin on the crank is connected to the yoke. The pin used to connect yoke and crank is a bolt
1.3 Working principle
When the power is supplied to the 12v Dc motor, shaft and crank attached to the shaft start rotating. As the crank rotates the pin slides inside the yoke and also moves the yoke forward. When the crank rotates the forward direction. The maximum displacement will be equal to the length of the crank. When the crank completes the next of rotation the yoke comes back to its initial position. For the next of rotation, yoke moves in the backward direction. When the crank completes a full rotation the yoke moves back to the initial position. For a complete rotation of crank the yoke moves through a length equal to double the length of the crank. The displacement of the yoke can be controlled by varying the length of the crank.
1.4 Motivation
When we searching for our project in market we show the demand of hacksaw blade is considerably increasing day by day with the growth of industrialization, engineering sector, real estate, automobile sector etc.
It is used in almost every sector for cutting of materials like angle, channel, flat plates, rods and such other things. It is also required in auto repairing shops, general repairing workshops, fitting shops, welding shops and technical institutes. Govt. department like Railway, Defense, PWD, Postal & Telegraph and others are one of the main users of it.
In India large nos. of small enterprises are engaged in its manufacturing. By considering its demand, new production unit has great prospect. So from that we have concluded that the future base hacksaw machine is use for very costly machinery and in locomotives.
User can use this project in small industry, which cannot afford costly machinery.
Definition
Hacksaw Machines offered by us are used for metal cutting ranging from transportable model to giant size machine. Owing to smooth & speedy functioning abilities, these hacksaw machines operations spontaneously for aiding the worker in consistently carrying his work with ultimate competence.
The sewing machine is a machine tool designed to cut material to a desired length or contour. It functions by drawing a blade containing cutting teeth through the work piece. The sewing machine is faster and easier than hand sawing and is used principally to produce an accurate square or mitered cut on the work piece.
2.2 History of Hacksaw Machine
The saw was one of the first great innovations of the Metal Age. It was developed with smelted copper, from which a blade could be cast. Many of the early copper saws have the general appearance of large meat-carving knives. Egyptian illustrations from about 1500 BC onward show the saw being used to rip boards, the timber being lashed to a vertical post set into the ground.
Though there is no evidence of the type of saw used, Egyptians were able to saw hard stone. The blade, was probably toothless, and rode on an abrasive material such as moistened quartz sand. The 7 1/2-foot granite coffer still in the Great Pyramid carries saw marks.
During the Bronze Age, saws became much more widespread in woodworking. It was in this time that the modern form of the saw began to come into play. Some of the saws used resembled hacksaw blades of today.
Iron saws started to be produces in the mid-7th century BC. The Romans, added many improvements to simple says which made them easier to work with.
For example, they added a rib to the back of saws to reduce the buckling of the thin blade. Hacksaws today use similar ribs to those on the ancient Roman saws.
While saws for cutting metal had been in used for many years, significant improvements in longevity and efficiency were made in the 1880s by George N. Clemson, a founder of Clemson Bros., Inc of Middletown, New York, USA, Clemson conducted tests which involved changing the dimensions, shapes of teeth, styles of set, and variable heat treatments of blades. Clemson claimed enormous improvements to the cutting ability of blades and built a major industrial operation manufacturing hacksaw blades sold under the trade name Star Hack Saw. In 1898, Clemson was granted US Patent 601947, which details various improvements in the hacksaw.
Features of Hydraulic Hacksaw Machine
(1) High productivity.
(2) Corrosion-resistance.
(3) Trouble free service.
(4) Optimum performance.
(5) Long lasting.
Features of Power Hacksaw Machine
(1) Fine cutting.
(2) Longer service life.
(3) Self lubrication.
(4) Infinitely variable feed rate.
(5) Cutting arm of high tension bearing capacity.