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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
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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
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 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.
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 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
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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.
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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.
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THANK
YOU
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