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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Development of a standard process plan 4. 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.
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.
Apart from process planning the manufacturing supervisor has to determine the appropriate cutting conditions for the machining generatkve, 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. 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. Similarly, in case of machine breakdown on the shop floor, CAPP must generate the alternative actions so that most economical solution can be adopted in the given situation.
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. It provides wystem the planning of the process to be used in producing a designed part.
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.
In Discrete Manufacturing, Art-to-Part validations have been performed often, but when considering highly volatile engineering designs, and multiple cappp operations with multiple tooling options, the decisions tables become longer and the vector matrices genreative complex.
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.
From Wikipedia, the cpp encyclopedia. The system developed is such that it is easier to retrieve the process plans for the new work parts. In addition, a Manufacturing Execution System MES was built to handle the scheduling of tools, personnel, supply, and logistics, as well as maintain shop floor production capabilities. Until recently, the whole process planning tasks were being done manually.
Computer-aided process planning initially evolved as a means to electronically store a process plan once it was created, retrieve it, modify it for a new part and print the plan. This makes the whole process of designing, planning and manufacturing an integrated process. 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.
The variant process planning approach can be realized as a four step process; 1.
The documents made from the computer are neat, clean and clear, which makes reading the routing sheets easier. Generative or dynamic CAPP is the main focus of development, the ability to automatically generate production plans for new products, or dynamically update production plans on the basis of resource availability. When comapred with manual experience-based process planning, CAPP offers following advantages; Systematic developemnt of geerative 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 generaitve as cost and manufacturing lead time estimation and work standards can be interfaced.
Sometimes, the process plans are developed for parts representing a fmily of parts called ‘master parts’. The system created is highly specific, the concepts can be extrapolated to other enterprises. With CAPP the amount of the clerical work is greatly reduced for the process engineers and there are fewer chances of errors. Product lifecycle management Workflow technology Information technology management Industrial computing. Process planning translates design information into the process steps and instructions to efficiently and effectively manufacture products.
With CAPP the routine clerical tasks of the manufacturing engineers are reduced, so they can invest their time in more productive tasks.
The level of detail is much greater in a generative system than a variant system. Traditional Manufacturing Process Planning All the three tasks: 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 process plan.
Systm parts into part families 3. But now the computers are being used for manufacturing planning tasks. 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. This suggests a system in which design information is processed by the process planning system to generate manufacturing process details. Acpp CAPP system the engineers can make the routing sheets for the jobs faster resulting in lesser lead times for the manufacturing process.
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.