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 whole process plan documents the operations as well as the sequence of operations on different machines. Unlike a Variant Process Planning system that modifies existing plans, each process plan could be defined automatically, independent of past routings. 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.
Retrieval and modification of standard process plan A number of variant process planning schemes have been developed and are in use. The level of detail is much greater in a generative system than a variant system. Product lifecycle management Workflow technology Information technology management Industrial computing. Execution planning can be dynamic and accommodate changing conditions.
Computer-aided process planning
The parameters are used to produce multidimensional differential equations. Process planning is very time-consuming and the results vary based on the person doing the planning”. CAPP integrates and optimizes system performance into the inter-organizational flow. But now the computers are being used for manufacturing planning tasks. gendrative
Solving the partial differential equations will produce the optimum process and production planning at the time when the solution was generated.
There are two approaches for computer aided planning process: Whether one is using the retrieval system or the generative system, there are number of benefits of CAPP as described below: With CAPP the amount of the clerical work is greatly reduced for the process engineers and there are fewer chances of errors.
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 retrieval CAPP system offers lots of flexibility as one can do lots of editing and changes as per the fenerative. Development of manufacturing knowledge base is backbone of generative CAPP.
Thus the process planning becomes logical, consistent and rationalized as it does not depends on the individualistic experience or judgment. The whole process of planning sytsem done in different way in different companies.
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. In CAPP the same software carries out the process planning and its procedure remains the same whoever uses it. 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.
Computer-aided process planning – Wikipedia
Similarly, in case of machine breakdown on the shop floor, Gsnerative must generate the alternative actions so that most economical solution can be adopted in the given situation.
The results of the planning are:. Development of a standard process plan 4.
The variant process planning approach can be realized as a four step process; 1. This page was last edited on 26 Septemberat 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. From Wikipedia, the free encyclopedia. For example, details such as rough and finished states of the parts and process capability of machine tools to transform these parts to the desired states are provided.
The system allows new products to be brought on line quickly based on their manufacturability. 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.
This CAPP system synthesizes the design of the optimum process sequence based on the analysis of the part geometry, material and other relevant parameters. Process planning is concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product. This makes the whole process of designing, planning and manufacturing an integrated process.
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. Grouping parts into part families 3. 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. Groover and Emory W. The planning begins with engineering drawings, specifications, parts or material lists and a forecast of demand. Computer Aided Process Planning. Views Read Edit View history.