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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Execution planning can be dynamic and accommodate changing conditions. Computer Aided Process Planning. 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 whole process plan documents syxtem operations as well as the sequence of operations on different machines.
One has to give certain inputs to the systems like detailed description of the part to be manufactured. In some cases the manufacturing engineering gives detailed list of the steps of the machining operations and also mentioning the work center on which the operation has to be carried out.
The whole process of planning gwnerative done in different way in different companies.
Computer-aided process planning
Process planning in manufacturing also refers to the planning of use of blanks, spare parts, packaging material, user instructions manuals etc. This suggests a system in which design information is processed by the process planning system to generate manufacturing process details. Views Read Edit View history. There are two approaches for computer aided planning process: This process plan is also used for the new parts that come under the same family.
In the generative process planning systems new plan is made automatically from scratch for each part using the computers, without involving human assistance. The retrieval CAPP system offers lots of flexibility as one can do lots of editing and changes as per the requirements. Process planning encompasses the activities and functions to prepare a detailed set of plans and instructions to produce a part.
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. The documents made from the computer are neat, clean and clear, which makes reading the routing sheets easier.
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. Process planning is very time-consuming and the results vary based on the person doing the planning”.
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 concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product. The manufacturing process planning geneartive 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. 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.
Retrieval and modification of standard process plan A number of variant process planning schemes have been developed and are in use. According to Engelke,  the need for CAPP is greater with an increased number of different types of capl being manufactured, and cpap a more complex manufacturing process.
A typical CAPP frame-work is shown in figure CAPP integrates and optimizes system performance into the inter-organizational flow. Within each part family standard process plan is established, which is stored in the computer. 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. 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 Process Planning
Solving the partial differential equations will produce the optimum process and production planning at the time gnerative the solution was generated. 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 ssytem planners Higher level application progams such as cost and manufacturing lead time estimation and work standards can be interfaced.
All the three tasks: Other capabilities were table-driven cost and standard estimating systems, for sales representatives to create customer quotations and estimate delivery time. The process planning task is genertaive too much dependent on the generatjve and the judgment of the engineer working in the production shop since years. Both these systems have been described below. But now the computers are being used for manufacturing planning tasks.
Grouping parts into part families 3. Management and Technology”, p.
Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers
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. 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.
Until recently, the whole process planning tasks were being done manually. generayive
To make the proper sequence the operations are documented on a form known as the route sheet. This page was last edited on 26 Septemberat Due to this there are differences in the sequence of the machining operations developed by different planners.
Development tenerative manufacturing knowledge base is backbone of generative CAPP. 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.
The variant process planning ststem can be realized as a four step process; 1.