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MANFACTURING TECHNOLOGYin mechanical engineerinh
- 2. PRESENTED BY :LANKA NAGA DURGA JAGADEESH ENROLLMENT NO.: 20107008 SUPERVISED BY : DR. SABINDRA KACHHAP SIR Assistant Professor Mechanical Engineering NIT MANIPUR Research Area: Advanced Machining Processes, Optimization Technique, Natural Composites
- 4. CONTENTS • JIGS • TYPES OF JIGS • FIXTURES • TYPES OF FIXTURES • APPLICATION OF THE JIG AND FIXTURES? • DIFFERENCE BETWEEN JIG & FIXTURE • ADVANTAGES OF JIGS & FIXTURES • DISADVANTAGES OF JIGS & FIXTURES • MAKING OF JIGS AND FIXTURES • CONCLUSION
- 5. JIG A jig is a device used in securing a workpiece and machine part on a workstation. It is secured to the CNC machine tools such as a lathe cutting tool, where it dictates the location and motion. That means, in a way, it guides such machining tools. Jigs are unique such that when they move, the tool becomes stationary.
- 6. TYPES OF JIGS • Template Jig • Plate Jig • Channel Jig • Diameter Jig • Leaf Jig • Ring Jig • Box Jig
- 7. Template Jig •The template jig is the simplest of all the models. The plate, having two holes, acts as a template fixed on the component to be machined. The drill is guided through these template holes, and the required holes are drilled on the workpiece at the same relative positions as on the template.
- 8. Plate Jig •A plate jig improves the template jig by incorporating drill bushes on the template. The plate jig is employed to drill holes on large parts, maintaining accurate spacing with each other.
- 9. Channel Jig Channel jig is a simple type of jig having a channel-like cross-section. The component is fitted within the channel and is located and clamped by rotating the knurled knob. The tool is guided through the drill bush.
- 10. Diameter Jig •A diameter jig is used to drill radial holes on a cylindrical or spherical workpiece.
- 11. Leaf Jig •The leaf jig has a leaf that may be swung open or closed on the work for loading or loading purposes.
- 12. Ring Jig •Ring jig is employed to drill holes on circular flanged parts. The work is securely clamped on the drill body, and the holes are drilled by guiding the tool through drill bushes.
- 13. Box Jig •Box jig is of box-like construction within which the work is rigidly held so that it can be drilled or machined from different angles at a single setting depending on which face of the jig is turned toward the tool.
- 14. FIXTURE • A fixture or CNC fixture is another popular CNC machining tool regarded as an agent of stability, support, and positioning. Like the jig, it works to secure, support, or mount a workpiece on a CNC machine.
- 15. TYPES OF FIXTURE • Turning Fixtures • Milling Fixtures • Broaching Fixtures • Indexing Fixtures • Grinding Fixtures • Boring Fixtures • Tapping Fixtures • Duplex Fixtures • Welding Fixtures • Assembly Fixtures
- 16. Turning Fixtures •These fixtures are generally mounted on the nose of the machine spindle or a faceplate, and the workpieces hold them. The fixture may have to be provided with a counterweight or balance the unbalance fixture whenever necessary.
- 17. Milling Fixtures •Milling fixtures are typically mounted on the nose of the machine spindle or a faceplate, and the workpieces hold them. The table is shifted and set in the proper position about the cutter. The workpieces are located in the base of the fixture and clamped before starting the operation.
- 18. Broaching Fixtures •Broaching fixtures are used on different broaching machines to locate, hold and support the workpieces during the operations, such as keyway broaching operations, such as keyway broaching, hole broaching, etc.
- 19. Indexing Fixtures •Several components need machining on different surfaces such that their machined surface surfaces or forms are evenly spaced. Such elements must be indexed equally as many as the number of surfaces to be machined. The holding devices (jigs or fixtures) used are made to carry a suitable indexing mechanism. A fixture having such a device is known as an indexing fixture.
- 20. Grinding Fixtures •These fixtures may be the standard work-holding devices, such as chucks, mandrels, chuck with shaped jaws, magnetic chucks, etc. For external surface grinding, cylindrical grinding utilizes plain or tapered mandrels. The workpiece is located and held on the mandrel with the help of the bore so that the external surface may be machined truly concentric to the bore. For internal grinding, the chuck is the most standard fixture. For holding irregularly shaped components, the fixture is designed the same as turning or boring fixtures.
- 21. Boring Fixtures •This fixture incorporates almost all the prevailing principles of jig and fixture design; their construction need not be as sturdy as that of the milling fixtures because they never have to bear as heavy cutting loads as involved in milling fixtures because they never have to endure as heavy cutting loads as involved in milling operations..
- 22. Tapping Fixtures •Tapping fixtures are specially designed to position and firmly secure identical workpieces to cut internal threads in drilled holes. Odd-shaped and unbalanced components will always need such fixtures, especially when the tapping operation is to be carried out repeatedly on a mass scale on such parts..
- 23. Duplex Fixtures •It is the name given to the fixture which holds two similar components simultaneously and facilitates simultaneously machining of these components at two separate stations..
- 24. Welding Fixtures •Welding fixtures are carefully designed to hold and support the various components welded in proper locations and prevent distortions in welded structures. For this, the locating element needs to be careful; clamping has to be light but firm, and the placement of clamping elements has to be clear of the welding area. The fixture must be pretty stable and rigid to withstand the welding stresses.
- 25. Assembl y Fixtures •The function of these fixtures is to hold different components together in their proper relative position when assembling them.
- 26. APPLICATION OF THE JIG AND FIXTURES? • 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. • Jigs used for mass drilling, reaming and tapping. • For guiding the tools for machining contours. • Fixtures used for milling, mass turning, and grinding operations.
- 27. DIFFERENCE BETWEEN JIG AND FIXTURES JIG FIXTURES • It holds and locates the work as well as guides the tool. • These are lighter in construction and clamping with the table is often unnecessary. • Used for holding the work and guiding the tool in drilling, reaming or tapping operation • Gauge blocks are not necessary. • The cost is more. • Their designing is complex • It holds and locates the work but does not guide the tool. • These are heavier in construction and bolted rigidly on the mausine table. • Used for holding the work in milling, grinding, turning or planning operation. • Gauge blocks may be provided for effective handling • The cost is less as compared with the jigs.
- 28. Advantages &Disadvantages of Jigs and Fixtures • Increase in production. • The consistent quality of manufactured products due to low variability in dimension. • Cost reduction. ADVANTAGES DISADVANTAGES • can wear away over time • can have complicated designs • high initial set up costs (and time) • can use a lot of material and be bulky
- 29. MAKING OF JIGS AND FIXTURES • Jigs and fixtures can be manufactured using CNC machining and 3D printing, but in general, 3D printing offers a number of advantages. In this case, additive manufacturing is cheaper and faster than CNC machining by a wide margin. Also, only 3D printing offers engineers the flexibility to frequently re-optimize design.
- 30. CONCLUSION • Jigs and Fixture is an essential element in Manufacturing Technology. There are several factors you should consider to make jig and fixtures. • Here in this PPT, I covered all the important points regarding Jigs and Fixtures. • I hope you ALL understand everything
- 31. THANK YOU :]