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Transfer machines

  1. TRANSFER MACHINES Combination of individual machines or machining heads arranged in the required sequence, connected by work transfer devices and integrated with interlocking controls. Transfer machines permit the maximum number of operations to be performed on workpieces at a maximum production rate. 1 11/27/2014
  2. FEATURES Parts are indexed in a straight line or circle from station to station. At each station required operations are performed simultaneously. Loading and unloading, either manually or automatically, occurs at each end of the line. When the component reaches the end of the line, all necessary operations have been completed. 2 11/27/2014
  3. Operations done on Transfer Machines  All types of machining operations such as drilling, boring, reaming, tapping and milling are economically combined on transfer machines.  Lathe type operations such as turning and facing are performed by rotating the work-pieces on selected work stations. 3 11/27/2014
  4. Types Of Transfer Machines The transfer machines are classified according to the arrangement of work stations.  In-line transfer machines  Rotary indexing table transfer machines  Drum type transfer machines 4 11/27/2014
  5. In-line Transfer Machines  It consists of a central bed and the machining heads are arranged on the sides at a convenient pitch.  the components are transferred along guide rails on the central bed.  cylinder blocks, gear box castings and axle box castings are transfer machined by this method. 5 11/27/2014
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  7. Rotary Indexing Table Transfer Machines  A rotary indexing table is used for transferring components from fixed stations of machining heads, which are spaced at equal intervals around the periphery of the table.  These machines are smaller in size.  It saves floor space and presents more compact arrangement.  It can also be installed for complete automatic assembly of a product. 7 11/27/2014
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  9. Drum Type Transfer Machines  Like rotary table type, this machine also transfers the components in a circular path to workstations positioned around at equal distances.  This machine instead of having a table has got a drum which rotates about a horizontal axis.  The work fixtures are fixed around the periphery of the drum. 9 11/27/2014
  10. Limitations  Lower station remains idle due to limitations of space.  Work at the lower station is always hanging, therefore needs firm clamping.  The drum size is limited. 10 11/27/2014
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  12. Constructional Features of Transfer Machines  Central bed May be straight, circular or U shaped.  Machining head Usually made as multiple spindle tool heads driven by self contained motors and reduction gear boxes.  Work loading devices 1. Manual loading 2. Automatic loading 12 11/27/2014
  13.  Work transfer mechanisms Table indexing mechanisms are employed in rotary and drum type machines. Eg: Geneva gear mechanism In in-line machines, endless chain conveyors or hydraulically operated transfer bars may be employed.  Work-piece locating and clamping devices Stationary fixtures Pallets (travelling fixtures)  Transfer line control systems It employs electrical, hydraulic or pneumatic inter-linkage devices. 13 11/27/2014
  14.  Coolant supply Centralized supply Separate coolant feed mechanism attached with machining heads  Chip disposal Mechanical method by means of scraper, brush and screw conveyor. Gravity method with chutes and chip collectors. Removal of chip by liquid or compressed air jet. By means of electromagnets 14 11/27/2014
  15. Advantages of Transfer Machines  Greater accuracy  Reduces production time  Greater output  Reduced component cost  Less floor space is required  Heavy and irregular parts can be machined. 15 11/27/2014
  16. Disadvantages  Initial cost is high.  Break-down of even one machine stops the operation of the entire transfer line.  Control systems are complex.  High skills are required for initial settings.  Lack of flexibility. 16 11/27/2014
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  18. THANK YOU 11/27/2014 18

Editor's Notes

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