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©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
Ch 17 Automated Assembly Systems
Sections:
1. Fundamentals of Automated Assembly Systems
2. Quantitative Analysis of Assembly Systems
©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
Automated Assembly - Defined
The use of mechanized and automated devices to perform
the various assembly tasks in an assembly line or cell
 Fixed automation usually
 Most automated assembly systems are designed to
perform a fixed sequence of assembly steps on a
specific product that is produced in very large
quantities
©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
Automated Assembly -
Application Characteristics
 Where is automated assembly appropriate:
 High product demand
 Stable product design
 The assembly consists of no more than a limited
number of components
 The product is designed for automated assembly
©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
Typical Products
Alarm clocks Light bulbs
Ball bearings Locks
Ball point pens Mechanical pencils
Cigarette lighters PCB assemblies
Door mechanisms Small electric motors
Gear boxes Wrist watches
©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
Assembly Processes in
Automated Assembly
Adhesive bonding Snap fitting
Insertion of components Soldering
Placement of components Spot welding
Riveting Stapling
Screw fastening Stitching
©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist.
No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book
Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover.
System Configurations
1. In-line assembly machine
2. Dial indexing machine
3. Carousel assembly system
4. Single-station assembly cell

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automation method.ppt

  • 1. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Ch 17 Automated Assembly Systems Sections: 1. Fundamentals of Automated Assembly Systems 2. Quantitative Analysis of Assembly Systems
  • 2. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Automated Assembly - Defined The use of mechanized and automated devices to perform the various assembly tasks in an assembly line or cell  Fixed automation usually  Most automated assembly systems are designed to perform a fixed sequence of assembly steps on a specific product that is produced in very large quantities
  • 3. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Automated Assembly - Application Characteristics  Where is automated assembly appropriate:  High product demand  Stable product design  The assembly consists of no more than a limited number of components  The product is designed for automated assembly
  • 4. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Typical Products Alarm clocks Light bulbs Ball bearings Locks Ball point pens Mechanical pencils Cigarette lighters PCB assemblies Door mechanisms Small electric motors Gear boxes Wrist watches
  • 5. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Assembly Processes in Automated Assembly Adhesive bonding Snap fitting Insertion of components Soldering Placement of components Spot welding Riveting Stapling Screw fastening Stitching
  • 6. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. System Configurations 1. In-line assembly machine 2. Dial indexing machine 3. Carousel assembly system 4. Single-station assembly cell
  • 7. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. In-Line Assembly Machine A series of automatic workstations located along and in-line transfer system  Either synchronous or asynchronous work transfer used
  • 8. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Dial Indexing Machine Base parts are loaded onto fixtures or nests attached to a circular dial table, and components are added at workstations located around the periphery of the dial as it indexes from station to station
  • 9. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Dial indexing assembly machine (Bodine Corp.)
  • 10. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Carousel Assembly System A hybrid between circular work flow of dial indexing machine and straight work flow of in-line system
  • 11. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Single-Station Assembly Cell Assembly operations are performed on a base part at a single location  A robot is sometimes used as the assembly machine
  • 12. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Multi-Station vs. Single-Station  Multi-station assembly machine or line  Faster cycle rate  High production quantities  More operations possible  More components per assembly  Single-station assembly cell  Suited to robotic assembly  Intended for lower production quantities
  • 13. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Parts Delivery at Workstations  Typical parts delivery system at a workstation consists of the following hardware components: 1. Hopper - container for parts 2. Parts feeder - removes parts from hopper 3. Selector and/or orientor - to assure part is in proper orientation for assembly at workhead 4. Feed track - moves parts to assembly workhead 5. Escapement and placement device - removes parts from feed track and places them at station
  • 14. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Parts Delivery System at Station
  • 15. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Vibratory Bowl Feeder  Most versatile of hopper feeders for small parts  Consists of bowl and helical track  Parts are poured into bowl  Helical track moves part from bottom of bowl to outlet  Vibration applied by electromagnetic base  Oscillation of bowl is constrained so that parts climb upward along helical track
  • 16. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Vibratory Bowl Feeder
  • 17. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Vibratory Bowl Feeder Photo courtesy Syntron Inc.
  • 18. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Selector and/or Orientor  Purpose - to establish the proper orientation of the components for the assembly workhead  Selector  Acts as a filter  Only parts in proper orientation are allowed to pass through to feed track  Orientor  Allows properly oriented parts to pass  Reorients parts that are not properly oriented
  • 19. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Parts Selection and Orientation (a) Selector (b) Orientor
  • 20. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Feed Track  Moves parts from hopper to assembly workhead  Categories: 1. Gravity - hopper and feeder are located at higher elevation than workhead 2. Powered - uses air or vibration to move parts toward workhead
  • 21. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Escapement and Placement Devices  Escapement device  Removes parts from feed track at time intervals that are consistent with the cycle time of the assembly workhead  Placement device  Physically places the parts in the correct location at the assembly workstation  Escapement and placement devices are sometimes the same device, sometimes different devices
  • 22. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Escapement and Placement Devices (a) Horizontal and (b) vertical devices for placement of parts onto dial-indexing table
  • 23. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Escapement and Placement Devices Escapement of rivet-shaped parts actuated by work carriers
  • 24. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Escapement and Placement Devices Two types of pick-and-place mechanisms for transferring base parts from feeders to work carriers
  • 25. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. Quantitative Analysis of Assembly Systems 1. Parts delivery system at workstations 2. Multi-station assembly machines 3. Single-station assembly cells 4. Partial automation
  • 26. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. What the Equations Tell Us  The parts delivery system at each station must deliver components to the assembly operation at a net rate that is greater than or equal to the cycle rate of the assembly workhead  Otherwise, assembly system performance is limited by the parts delivery system rather than the assembly process technology  Component quality has an important effect on system performance - poor quality means  Jams at stations that stop the entire assembly system  Assembly of defective components in the product
  • 27. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. What the Equations Tell Us  As the number of stations increases, uptime efficiency and production rate are adversely affected due to parts quality and station reliability effects  The cycle time of a multi-station assembly system is determined by its slowest station  By comparison with a multi-station assembly system, a single-station assembly cell with the same number of assembly tasks has a lower production rate but a higher uptime efficiency
  • 28. ©2008 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. For the exclusive use of adopters of the book Automation, Production Systems, and Computer-Integrated Manufacturing, Third Edition, by Mikell P. Groover. What the Equations Tell Us  Multi-station assembly systems are appropriate for high production applications and long production runs  By comparison, single-station assembly cells have a longer cycle time and are more appropriate for mid-range quantities  Storage buffers should be used on partially automated production lines to isolate the manual stations from breakdowns at the automated stations  An automated station should be substituted for a manual station only if it has the effect of reducing cycle time sufficiently to offset negative effects of lower reliability