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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Solutions had the flexibility to change over time based on the ability to satisfy agile manufacturing criteria.
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Grouping parts into part families 3. This page was last edited on ca;p Septemberat The whole process of planning is done in different way in different companies. Further, with computers it becomes easier to generate production routings that are rational, and consistent without depending on the experience or the judgment of the individuals.
Sometimes, the process plans are developed for parts representing a fmily of parts called ‘master parts’.
Unlike a Variant Process Caapp system that modifies existing plans, each process plan could be defined automatically, independent of past routings. Process planning encompasses the activities and functions to prepare a detailed set of plans and instructions to produce a part. Thus the process planning becomes logical, consistent and rationalized as it does not depends on the individualistic experience or judgment.
Within each part family standard process plan is established, which is stored in generatife computer. 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. 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.
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.
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According to Engelke,  the need for CAPP is greater with an increased number of different types of parts being manufactured, and with a more complex manufacturing process. The planners can invest their time on more skilled jobs and also attain the better process plan that is eventually translated into their higher productivity.
In some companies the machinists are merely given the drawing and asked to complete the job. Process planning translates design information into the process steps and instructions to efficiently and effectively manufacture products. Published by Prentice-Hall of India Pvt. However, the individual engineers have their own opinions about what constitutes the best routing for the manufacture of a job.
Retrieved from ” https: The parameters are used to produce multidimensional differential equations. The system created is highly specific, the concepts can be extrapolated to other enterprises. In CAPP the same software carries out the process planning and its procedure remains the same whoever uses it. The system allows new products to be brought on line quickly based on their manufacturability.
The variant process planning approach can be realized as a four step process; 1. In the route sheet there is a list of the production operations and the machine tools that can carry out these operations on the part or the assembly.
This makes the whole process of designing, planning and manufacturing an integrated process. When comapred with manual experience-based process planning, CAPP offers following advantages; Systematic developemnt of accurate and consistent process plans Reduction of cost and lead time of process planning Reduced skill requirements of process planners Increased productivity of process planners Higher level application progams such as cost and manufacturing lead time estimation and work standards can be interfaced.
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.
The results of the planning are:. Whether one is using the retrieval system or the generative system, there are number of benefits gneerative CAPP as described below: Process planning is concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product.
It provides for the planning of the process to be used in producing a designed part.
This CAPP system synthesizes the design of the optimum process sequence based on the analysis of the part geometry, material and other relevant parameters. Generative or dynamic CAPP is the main focus of development, the ability to automatically calp production plans for new products, or dynamically update production plans on the basis of resource availability.
Until recently, the whole process planning tasks were being done manually. With CAPP system the engineers can make the routing sheets for the jobs faster resulting in lesser lead times for the manufacturing process.
Module G:Computer Aided Process Planning
Retrieval and modification of standard process plan A number of variant process planning schemes have been developed and are in use. 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.