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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The Planning Function Every part or product that has to be manufactured in the machine shop of the manufacturing company has to undergo through a series of machining operations in a proper sequence. The variant process planning approach can be realized as a four step process; 1.
Execution planning can be dynamic and accommodate changing conditions. This system can generahive used to generate process plan for rotational, prismatic and sheet-metal parts.
egnerative This CAPP system synthesizes the design of the optimum process sequence based on the analysis of the part geometry, material and other relevant parameters. The parameters are used to produce multidimensional differential equations.
The whole process plan documents the operations as well as the sequence of operations on different machines. Then the supervisor also sets the appropriate time for each machining operations so that the part can be manufactured within the stipulated time ensuring the optimum productivity.
Computer-aided process planning – Wikipedia
The system allows new products to be brought on line quickly based on their manufacturability. The manufacturing process planning involves determining proper sequence of manufacturing operations to be carried out so that part can be produced in the least possible time making the optimum use of the available resources.
All articles with dead external links Articles with dead external links from August Articles with permanently dead external links. Development of a standard process plan 4. Development of manufacturing knowledge base is backbone of generative CAPP. Process planning encompasses the activities and functions to prepare a detailed set of plans and instructions to produce a part.
Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers
Solutions had the flexibility to change over time based on the ability to satisfy agile manufacturing criteria. The system developed is such that it is easier to retrieve the process plans for the new work parts. This page was last edited on 26 Septemberat The geometry based coding scheme defines all geometric features for process related surfaces together with feature dimensions, locations, tolerances and the surface finish desired on the features.
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. Until recently, the whole process planning tasks were being done manually. Process knowledge in form of in the form of decision logic and data matches the part geometry requirements with the manufacturing capabilities using knowledge base. Groover and Emory W. 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.
Process planning is very time-consuming and the results vary based on the person doing the planning”. Apart from process planning the manufacturing supervisor has to determine the appropriate cutting conditions for the machining operations, ensuring that there is least wastage of the material. The use of computers for process planning enables removing a number of problems associated with the manual process planning.
Generative Process Planning
Grouping parts into part families 3. The CAPP software can be easily integrated with the other software like designing and manufacturing software. Thus the process planning becomes logical, consistent and rationalized as it does not depends on the individualistic experience or judgment.
With CAPP the routine clerical tasks of the manufacturing engineers are reduced, so they can invest their time in more productive tasks. Generative CAPP systems are built on a factory’s production capabilities and capacities. Keneth Crow  stated that “Manual process planning is based on a manufacturing engineer’s experience and knowledge of production facilities, equipment, their capabilities, processes, and tooling.
In the generative CAPP, process plans are generated by means of decision logic, formulas, technology algorithms and geometry based data to perform uniquely many processing decisions for converting part from raw material to finished state.
Among the different companies and the industries there are lots of variations in the format of the route sheet and the details found on it. Other capabilities were table-driven cost and standard estimating systems, for sales representatives to create customer quotations and estimate delivery time.
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Whether one is using the retrieval system or the generative system, there are number of benefits of CAPP as described below: In the generative process planning systems new plan is made automatically from scratch for each part using the computers, without involving human assistance. As improvements are made to production efficiencies, the improvements are automatically incorporated into the current production mix. Process planning is concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product.
However, the individual engineers have their own opinions about what constitutes the best routing for the manufacture of a job. Process planning translates design information into the process steps and instructions to efficiently and effectively manufacture generagive.
All the three tasks: