Study of jig design its types.
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A jig is a work holding device that locates and guides a cutting tool during machining operations to provide repeatable accuracy. It differs from a fixture which solely holds the workpiece. The document discusses the need for jigs in mass production situations. It provides examples of jig applications and purposes, which include facilitating economical production and interchangeability. The document compares an old jig design to a new proposed design, noting advantages of the new design include easier workpiece binding and a more organized drilling direction. It concludes that jigs are an essential manufacturing element that can increase production rates and reduce costs through consistent part accuracy.
Study of jig design its types.
- 1. Umair Raza 19013386-002 Studyof JigDesign 50 Introduction to Jig: It is a work holding device that holds, supports and locates the work piece and guides the cutting tool for a specific operation. Jigs are usually fitted with hardened steel bushings for guiding or other cutting tools. A jig is a type of tool used to control the location and/or motion of another tool. Jig is the device which guides the tool, while fixture is a device that securely holds the job in position during machining operations. Jig is the partwhich is used while performing machining operation. Basically, it provides the guide to the tool. Other thing is fixture which hold the work piece. Jig is a specific production device at which hold the work piece strongly or supporting the work piece and guidance of cutting tool. A jig is often confused with a fixture; a fixture holds the work in a fixed location. A device that does both functions holding the work and guiding a tool is called a jig and fixture. Need of Jig: When we require a large number of parts in very short time then jig is use. A jig is a type of custom-made tool used for the location and motion of another tool. They observed that the primary purpose of a jig is to provide repeatability, accuracy, and interchangeability in the manufacturing of products. Although the most common jigs are the drilling and boring jigs, they are all identical except for the shape, type, and the position of the bushings for drilling or boring. Jigs are imparted with tool guiding elements such as drill bushes, which regulate the tool to the right position in the work piece. Applications of Jig and fixture: There are various fields where we can use Jigs and Fixtures and those are: Facilitate economical production of engineering components. Make operation of parts fairly simple which otherwise would require a lot of skill and time. Manufacture accurately duplicate and interchangeable parts. Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure interchangeability of components. Mass production of automobile parts. Inspection of parts in continuous production in manufacturing industries. Cutting the ingots in the steel plant. In the refrigeration industry. Pump assembling process For drilling the flanges and drilling holes to any required angles. For multi-spindle machining.
- 2. Umair Raza 19013386-002 Studyof JigDesign 51 Purpose of jig and fixture: The basic purposes of developing and using suitable jigs and fixtures for batch production in machine shops. To eliminate marking, punching, positioning, alignments etc. Easy, quick and consistently accurate locating, supporting and clamping the blank in alignment of the cutting tool. Guidance to the cutting tool like drill, reamer etc. Increase in productivity and maintain product quality consistently. To reduce operator’s labour and skill – requirement. To reduce measurement and its cost. Enhancing technological capacity of the machine tools. Reduction of overall machining cost and also increases in interchangeability. Old jig Diagram & Disadvantages : Old design of jig: DisadvantagesofOld DesignJig Fixture: The direction of motion for drilling operation is random. The binding process for fix guide drill is difficult & it takes a long time. The guide drill fixes the work piece that may causes bending in the bottom surface. The work piece is compound from two parts which may result in slipping in the parts of work piece. Diagramof New design of Jig Fixture:
- 3. Umair Raza 19013386-002 Studyof JigDesign 52 Block: It is used to support the guide drill. Fork block: It is used to locate the arm with interfacing the work piece. Table: It is used to control the motion of fixture and locate the actual place of drill. Base Plate: It is basic for building of other components and it is connected with table by link. Drill Bushing: It is used for preventing the corrosion for guide drill. Bracket: It is used for help the arm to rotate by joint. Advantage of New Design: The blinding process for fix the work piece is very easy because the screw is included in Arm. The direction of motion for make drill is organized and deterministic. The total time for make fix work piece and release is short. The entering work piece and pulling is very easy. The new design is not required high skill and high performance. The new design is included drill bushing that makes preventive for guide drill from corrosion. By use the lateral screw that generates lateral force on the center of work piece and then it preventives the deviation for part of work piece from another. Conclusion: Jigs and Fixture is an essential element in Manufacturing Technology. There are several factors you should consider to make jig and fixtures. By using these you can save a couple of production time. The design of jigs and fixtures is dependent on the operation type as well as the machine tool to be used for the operation. They are fabricated with heat-treated steel that are corrosion and wear resistant.It can be seen that these are very important in manufacturing industries as these devices increase the production rate as well as reduce the manufacturing cost. By using these, identical parts are manufactured with greater dimensional accuracy because the jig gives the right direction in tooling operation. By using these,anuntrained person canalso perform the machining operation without almost
- 4. Umair Raza 19013386-002 Studyof JigDesign 53 any loss and save electricity as well. The only drawback is that the manufacturing cost of jig and fixture is high. Reference: https://en.wikipedia.org/wiki/Jig_(tool) http://www.scribd.com http://www.sciencedirect.com link.springer.com https://learnmechanical.com/jigs-and-fixtures/ https://www.researchgate.net/publication/281006514_The_Design_and_Need_for_Jigs_and_ Fixtures_in_Manufacturing