1. A seminar report on:
Computer Aided Process
Birla Institute of Technology,
CAPP is the use of computer technology to aid in the
process planning of a part or product in manufacturing.
CAPP is the link between CAD and CAM in that it provides
for the planning of the process to be used in producing a
Process planning is a production organization activity that
transforms a product design into a set of instruction
(sequence, machine tool setup etc.) to manufacture
machined part economically and competitively.
CAPP is the method of automatically generating the
sequence of manufacturing operations
CAPP capable of understanding and analyzing the part
It possess knowledge about machine tools, cutting tools,
It possess the capabilities of analyzing the
interdependencies between part, machining process,
It possess multiple calculating capabilities
6. Variant process planning
The variant process planning approach can be
realized as a four step process
Definition of coding scheme
Grouping parts into part families (Group Technology)
Development of a standard process plan
Retrieval and modification of standard process plan
7. Part coding &
Operations sequence file
Part family matrix file
Machine routing file
Other applications file
Diagram of Variant process plan:
8. Generative process planning:
It is the system which creates plan by means of
decision logic, formulas, geometry based data and
other logical procedures.
In this method process plans are prepared without
the assistance of human and predefined plans
After retrieving this information, the system can
generate the required processes and process
sequences for the work part.
9. Two major components of generative
Geometry description and coding component:
This defines all geometric features for process related surfaces
together with feature dimensions, locations, tolerances and the
surface finish desired on the features.
The level of detail is much greater in a generative system than a
Process knowledge database & decision making logic:
The knowledge will be in the form of decision logic.
It is required to match the part geometry requirement with
manufacturing capability using decision logic and data.
It includes selection of processes, mfg. equipments, work holding
devices, jigs & fixtures, inspection instruments, etc.
10. Geometric definition
Diagram of Generative process Plan:
11. Benefits of CAPP:
Lead time of
Mfg. and process
Work in progress