AUTOMATED STORAGE AND RETRIEVAL SYSTEM

MECHANICAL ENGINEERING
7TH SEM BATCH: 7C2
Name Enroll No.
Patel Hirenkumar 130450119097
Patel Mihir 130450119107
Patel Mubarak 130450119110
TOPIC : AGV, AS/RS & TOOL MANAGEMENT
SUBJECT : COMPUTER AIDED MANUFACTURING
GUIDED BY : Prof. Khusbu Panchal, Prof. Jay Shah
1

Introduction:
 An automated guided vehicles(AGV) is a battery operated ,
programmable and automatic guided mobile vehicle without
the need of human intervention, used for transporting the
material from the stores to the shop/ assembly line or vice
versa.
 Main parts of AGV:
(1)Structure
(2)Driver system
(3)Steering
mechanism
(4)Power source
(5)Onboard
computer for control

Types of automated guided vehicles:
 The automated guided vehicles are divided into six types:
(1)Unmanned AGV trains
(2)AGV Fork lift trucks
(3)AGV light load vehicles
(4)AGV pallet trucks
(5)AGV unit load vehicles
(6)AGV assembly line vehicles

(1) Unmanned AGV trains:
 Unmanned AGV trains consist of a towing vehicle which
pulls one or more trailers to form a train.
 As shown in fig.

(2) AGV pallet trucks:
 The worker drives the pallet truck to the guide path and
programs its destination points. The vehicle then automatically
proceeds to the destination point for unloading.
 The capacity of AGV pallet truck ranges up to several tons.
 It is used to move the palletised loads from floor level along
predetermined route.

(3) AGV fork lift trucks:
 It is equipped with forks which can move in vertical direction to
reach palletised loads on racks and stands.
 This vehicle has an ability to load and unload the palletised
loads both at floor level as well as stands.
 It can position its forks at any height so that load stands of
varying height can be accessed easily.

(4) AGV unit load vehicles:
 The AGV unit load vehicle is used to move unit loads from
one workstation to another.
 The vehicle is equipped for automatic loading and unloading
of pallets by means of powered rollers or lifting platforms.

(5) AGV light load vehicles:
 AGV light load vehicle is a small capacity vehicle with a
capacity of order of 200 kg. It is used to transport small loads
through plants of limited size engage in light manufacturing.

(6) AGV assembly line vehicles:
 AGV assembly line vehicles is a modification of AGV light
load vehicles used for assembly operation.
 AGV assembly line vehicle is designed to carry a subassemblies
through a sequence of assembly workstation where parts are
assembled to finished assembly.

Advantages:
1.AGV ensure the increased control over the material flow and
movement.
2.As the material movement is automated, the possibility of
product damage is minimum.
3.AGV ensures high locational and positional accuracy.
4.AGVs are great of help in hazardous working environment.
Limitation:
1.The system requires high initial investment.
2.AGV system is not suitable for small units.

AS/RS
Automated Storage and
Retrieval System

Introduction
• In large manufacturing industry, the volume of items and
components is so large that it becomes extremely unreliable
and time consuming to use manual storage and retrieval
system. Therefore, in such cases it is advisable to use the
automated storage and retrieval system.
• An automated storage/retrieval system (AS/RS) can be defined
as a storage system under which a defined degree of
automation is to be implemented to ensure precision accuracy
and speed in performing storage and retrieval operations.
These automated storage and mechanized systems eliminate
human intervention in performing basic sets of operations.

Objectives for Installing AS/RS
1. Increasing the storage capacity
2. Increasing the stock rotation
3. Utilization of maximum floor space
4. Recovering the space for manufacturing facilities
5. Customer service to be improved
6. Control over inventories to be improved
7. Ensuring safety in storage function
8. Increasing the labour productivity in storage function
9. Reducing labour cost in storage operation
10. Reducing pilferage and improving security

AS/RS Terminology
• An AS/RS consists of one or more storage aisles that are
serviced by a storage/retrieval (S/R) machine. The stored
materials are held by storage racks of aisles. The S/R machines
are used to deliver and retrieve materials in and out of
inventory. There are one or more input/output stations in each
AS/RS aisle for delivering the material into the storage system
or moving it out of the system. In AS/RS terminology, the
input/output stations are called pickup-and-deposit (P&D)
stations.

AS/RS Components
1. Storage Racks or Storage Structure
2. Transport Devices (AGV, Conveyor, etc)
3. Pick-Up and Delivery (P and D) Stations
4. Storage and Retrieval Machines (Stacker Crane)
5. Computer Control System
 Storage Racks or Storage Structure :
• The automated storage and retrieval system contains several
rows of storage racks for storing the material items. The
storage structure of automated storage and retrieval system
is much taller (can be as tall as 30 meters) than that of the
conventional storage and retrieval systems.

 Transport Devices (AGV, Conveyor, etc.) :
• The storage structure, where the material/items are stored, is
linked to the shop floor by transport devices such as automated
guided vehicles or conveyors.
• The incoming material/items are first sorted and loaded to
pallets. The loaded pallets are then passed through weighing
and sizing stations to ensure that they are within the load and
size limits.
 Pick-Up and Delivery (P and D) Stations :
• The input/output stations are called pick-up and delivery (P
and D) stations. The pallets are transported by the automated
guided vehicles or conveyors are received at P and D.
• The details of the pallet contents are communicated to the
central computer. The central computer assigns the storage
location in storage racks to the pallet.

 Storage and Retrieval Machine (Stacker Crane) :
• The pallet is moved from P and D station to the storage rack
by storage and retrieval cranes.
• Whenever there is a request for the item to the central
computer, the computer searches its memory for the storage
location and directs the stacker crane to retrieve the pallet.
• An S/R machine is capable of both horizontal and vertical
movement. A rail system along the floor guides the machine
and a parallel rail at the top (up to 30m) of the storage
structure is used to maintain its alignment.
 Computer Control System:
• The computer control unit performs two functions:
1. To control the operation of the system
2. To store the material movement and inventory data.

Types of AS/RS
• Several important categories of AS/RS can be distinguished
based on certain features and applications. The following are
the principle types :
 Unit Load AS/RS
• The unit load AS/RS is used to store and retrieve loads that are
palletized or stored in standard-sized containers. The system is
computer controlled. The S/R machines are automated and
designed to handle the unit load containers. Usually, a
mechanical clamp mechanism on the S/R machine handles the
load. However, there are other mechanisms such as a vacuum
or a magnet-based mechanism for handling sheet metal. The
loads are generally over 500 lb per unit. The unit load system
is the generic AS/RS.

 Mini Load AS/RS :
• This system is designed to handle small loads such as
individual parts, tools, and supplies that are contained in bins
or drawers in the storage system. Such a system is applicable
where the availability of space is limited. It also finds its use
where the volume is too low for a full-scale unit load system
and too high for a manual system. A mini load AS/RS is
generally smaller than a unit load AS/RS and is often enclosed
for security of items stored.
 Deep-lane AS/RS :
• This is a high-density unit load storage system that is
appropriate for storing large quantities of stock. The items are
stored in multi deep storage with up to 10 items in a single
rack, one load behind the next. Each rack is designed for flow-
through, with input and output on the opposite side. Machine
is used on the entry side of the rack for input load and loads
are retrieved from other side by an S/R- type machine.

 Man-on-board AS/RS :
• This system allows storage of items in less than unit load
quantities. Human operator rides on the carriage of the S/R
machine to pick up individual items from a bin or drawer. The
system permits individual items to be picked directly at their
storage locations. The operator can select the items and place
them in a module. It is then carried by the S/R machine to the
end of the aisle or to a conveyor to reach its destination.
 Automated Item Retrieval System :
• This system is designed for retrieval of individual items or
small product cartoons. The items are stored in lanes rather
than bins or drawers. When an item is retrieved from the front
by use of a rear-mounted pusher bar, it is delivered to the
pickup station by pushing it from its lane and dropping onto a
conveyor. After moving itself to the correct lane, the picking
head activates the pusher mechanism to release the required
number of units from storage.

Analysis of Automated
Storage/Retrieval Systems
• The total storage capacity of one storage aisle depends on how
many storage compartments are arranged horizontally and
vertically in the aisle. This can be expressed as follows:
Capacity per aisle = 2 ny nz
• Where ny = number of load compartments along the length of
the aisle, and nz = number of load compartments that make up
the height of the aisle. The constant 2 accounts for the fact that
loads are contained on both sides of the aisle.
• If we assume a standard size compartment (to accept a
standard size unit load), then the compartment dimensions
facing the aisle must be larger than the unit load dimensions.
• Let x and y = the depth and width dimensions of a unit load,
and z = the height of the unit load.

• The width, length, and height of the rack structure of the
AS/RS aisle are related to the unit load dimensions and
number of compartments as follows:
W = 3 (x + a)
L = ny (y + b)
H = nz (z + c)
• Where, W, L, and H are the width, length and height of one
aisle of the AS/RS rack structure (mm).
• x, y, and z are the dimensions of the unit load (mm).
• a, b, and c are allowances designed into each storage
compartment to provide clearance for the unit load (mm).
 Some of the limitations of automated storage and retrieval
system are as follows :
• The initial cost of the AS/RS is high.
• AS/RS requires automated guided vehicles or conveyors.
• AS/RS is feasible only for large manufacturing establishments.

INTRODUCTION
OF
TOOL MANAGEMENT SYSTEM

TOOL MANAGEMENT
SYSTEM
Tooling is one of the important part of manufacturing system
in flexible manufacturing system.
Therefore its necessary that the tooling system are to be
managed effectively for successful functioning of FMS.
Tool-
management
system
Tool-supply
system
Tool-monitoring
system

Tool Supply System
• In automated manufacturing system , the set of tools have to be supplied to the
system and taken out from the system at regular interval depending upon the
requirement.
• In NC/CNC machines
• In NC/CNC machines tools and FMS, all the tools are mounted on the tool
magazine of automatic tool changer at the beginning. if any of tool has to be
replaced from tool magazine ,during the operation the machine tool may have to
be stopped.
• That will Lead to loss of production time, so alternative method has to be used to
replace the tool from the tool magazine, during the operation.
• In NC/CNC machine tools, the parts of components are not changed frequently, so
tool replacement is not the major problem.

Tool Supply System(con...)
• In FMS
• In FMS, there can be more than one work station
and the part to be machined get changed more
frequently than that in NC/CNC machine tools.
• Therefore there has to be effective machine tool
supply system in place.
• The basic concept used in tool supply system is to
use auxiliary tool storage from where the
required tools can be transferred to main tool
magazine as and when required without much
loss of production time.

Various Tool Supply Systems
Tool supply systems used in FMS are as
follows:
I. Single tool magazine system
II. Multiple tool magazine system
III. Interchangeable tool magazine system
IV. Main and auxiliary tool magazine
system
V. Interchangeable tool cassettes system
VI. Tool highway system

Tool-monitoring System
• In order to ensure safety of the performance of the cutting
tool, its necessary to monitor tool continuously while it is
performing the cutting operations.
There are three methods of tool monitoring system:
• 1. Tool-wear monitoring
• 2. Tool breakage monitoring
• 3. Tool-life monitoring

AUTOMATED STORAGE AND RETRIEVAL SYSTEM

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