to computer-aided process planning are the variant approach and The generative approach involves generation of new process plans by means planning systems capable of automatically performing the complete task. Generative Computer Aided Process Planning: A system which automatically synthesizes a process plan for a new component is called. in some generative CAPP systems. CAPP has recently emerged as the most critical link to integrated CAD/CAM system into inter-organizational flow. Main focus.

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In CAPP the same software carries out the process planning and its procedure remains the same whoever uses it.

For example, when one changes the design, it must be able to fall back on CAPP module to generate manufacturing process and cost estimates for these design changes. Other capabilities were table-driven cost and standard estimating systems, for sales representatives to create customer quotations and estimate delivery time. Unlike a Variant Process Planning system that modifies existing plans, each process plan could be defined automatically, independent of past routings.

Module G:Computer Aided Process Planning

The system created is highly specific, the concepts can be extrapolated to other cqpp. Retrieval and modification of standard process plan A number of variant process planning schemes have been developed and are in use.

Published by Prentice-Hall of India Pvt. Views Read Edit View history. Process planning encompasses the activities and functions to prepare a detailed set of plans and instructions to produce a part. It includes selection of processes, machine tools, jigs or fixtures, tools, inspection equipments and sequencing operations.

In the generative process planning systems new plan is made automatically from scratch for each part using the computers, without involving human assistance.


Computer-aided process planning CAPP is the use of computer technology to aid in the process planning of a part or product, in manufacturing. The tools that are widely used in development of this database are flow-charts, decision tables, decision trees, iterative algorithms, concept of unit machined surfaces, pattern recognition techniques and artificial intelligence techniques such as expert system shells.

Thus the process planning becomes logical, consistent and rationalized as it does not depends on the individualistic experience or judgment. The planners can invest their time on sysrem skilled jobs and also attain the better process plan that is eventually translated into their higher productivity.

The process planning task is usually too much dependent on the experience and the judgment of the engineer working in the production shop since years. Development of a fenerative process plan 4.

It is the duty of the manufacturing engineer within the company to write the process plans for the new part designs to be manufactured in the machine shop.

In addition, a Manufacturing Execution System MES was built to handle the scheduling of tools, personnel, supply, and logistics, as well as maintain shop generqtive production capabilities. According to Engelke, [4] the need for CAPP is greater with an increased number of different types of parts being manufactured, and with a more genrative manufacturing process.

As the design process is supported by many computer-aided tools, computer-aided process planning CAPP has evolved to simplify and improve process planning and achieve more effective use of manufacturing resources.

Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers

The planning begins with engineering drawings, specifications, parts or material lists and a forecast of demand. Execution planning can be dynamic and accommodate changing conditions.


This fenerative was last edited on 26 Septemberat The whole process plan documents the operations as well as the sequence of operations on different machines. The computer program uses a set of algorithms that enables it to take a number of technical and logical decisions to attain the optimum final manufacturing generxtive plan.

Process planning translates design information into the process steps and instructions to efficiently and effectively manufacture products. With CAPP the amount of the clerical work is greatly reduced for the process engineers and there are fewer chances of errors.

Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers

With CAPP system the engineers can make the routing sheets for the jobs faster resulting in lesser lead times for the manufacturing process. This suggests a system in which design information is processed by the process planning system to generate manufacturing process details. Generative CAPP systems are built on a factory’s production capabilities and capacities. Traditional CAPP methods that optimize plans in a linear manner have not been able to satisfy the need for flexible planning, so new dynamic systems will explore all possible combinations of production processes, and then generate plans according to available machining resources.

Sometimes, the process plans are developed for parts representing a fmily of parts called ‘master parts’. From Wikipedia, the free encyclopedia. By using this site, you agree to the Terms of Use and Privacy Policy.