MT 21_CAD/CAM 3(1-2) Than Lin, Ph.D. Assistant Professor Asian Institute of Technology. Lecture: Week_12. CH10: CAD and CAM Integration

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1 MT 21_CAD/CAM 3(1-2) Lecture: Week_12 CH10: CAD and CAM Integration Than Lin, Ph.D. Assistant Professor Asian Institute of Technology 1

2 Reading Assignment Chapter 10 CAD and CAM Integration Pages 291 ~ 317 2

3 Introduction to CAD and CAM Integration - Tools used in the design process (CAD-software) - Tools used in the manufacturing process (CAM-software) - The need to automate process planning is the most urgent. - Process planning in general and CAPP systems will be discussed 3

4 Overview of the Discrete Part Production Cycle 4

5 Process Planning Fig Example of a process plan 5

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7 Manual Approach - Study the overall shape of the part - Determine the best raw material shape to use if raw stock is not given. - Identify datum surfaces and determine setups from this information - Identify part features (Refer Fig 10.4 and 10.5) - Group the part features based on the required setups - Order the sequence of the operations - Select tools for each operation - Select or design fixtures for each setup - Make a final check on the plan - Elaborate the process plan - Prepare the final process plan document 7

8 Manual Approach 8

9 Manual Approach 9

10 Example Prepare a process plan - Assume Precut bar stock and only conventional machine tools are used 10

11 The following sequence of operations can be used to produce a part - Setup 1 Chuck the workpiece Turn S3 to a 100mm diameter Face S1 Core drill S2 Counter bore S4 and S5 - Setup 2 Chuck the workpiece on S3 Turn S6 to 50mm diameter Undercut the neck Thread S6 Face S7 - Setup 3 Locate the workpiece, using S1 & S2 Mark six holes, S8 Center drill and drill six holes, S8 The elaborate process plans required, including tool and paramete r selection, for this example are left. 11

12 Two approaches used to develop a CAPP system -Variant Approach ~ An advanced manual approach ~ the planner s memory retrieval process is aided by computer ~ Requires database ~ Parts are classified by family using Group Technology Concept ~ Each part is assigned a code based on features and the parts are grouped into a family according to their codes. -Generative Approach ~ A process plan is generated automatically from engineering specifications of the finished part. ~ Engineering specifications include textual information, such as type of material, special processing details and special inspection instructions as well as graphical information 12

13 Computer-Aided Process Planning Systems CAM-I CAPP MI-PLAN MITURN MIAPP ACUDATA/UNIVATION CINTURN COM-CAPPV Based on Variant Approach CPPP AUTAP APPAS GENPLAN CAR MetCAPP ICEM-PART Based on Generative Approach 13

14 Computer-Aided Process Planning Systems 14

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16 Fig Sample op codes 16

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18 Group Technology - Grouping similar parts into a family with a proper coding system is an ess ential step for CAPP. -The concept of group technology enables this classification. - GT can be stated as follows: GT is the realization that many problems are similar, and that by grouping similar problems, a single solution can be found to a set of problems thus saving time and effort. [ Solaja and Urosevic, 1973] - GT can support the development of efficient plant layouts by having each cell layout handle each part family. This simplifies the flow pattern of materials in a plant. - GT code and modify it to generate the process plan for the new part 18

19 Group Technology 19

20 The part would be classified as by the following reasoning 3; Rotational workpiece, with through ho le 3; D=75mm, L/D=50/75=0.67 2;Holes not in axis 1;Plain steel 20

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29 Product Data Management (PDM) Systems -PDM systems were first developed to manage and control the volumes of electronic media that were created by CAD/CAM/CAE systems. - Linked to many different application packages do a better job of managing data on an enterprisewide basis. - Provides ready access to associated non-cad data, including part numbers, specifi cations, test results, and analysis studies. - PDM systems have become more popular because of the internet, the World Wide Web, and intranets. 29

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