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 parameters are used to produce multidimensional differential equations. Process planning encompasses the activities and functions to prepare a detailed set of plans and instructions to produce a part. In the route sheet there is a list of the production operations and the systme tools that can carry out these operations on the part or the assembly. 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.
The variant process planning approach can be realized as a four step process; 1. Traditional CAPP methods that optimize aystem in a linear manner have not been able to generatice 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 of planning is done in different way in different companies. This system can be used to generate process plan for rotational, prismatic and sheet-metal parts.
This makes the whole process of designing, planning and manufacturing an integrated process. Among the different companies and the industries there are lots of variations in the format of the sjstem sheet and the details found on it. 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.
Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers
In the retrieval type of CAPP system the various parts to be manufactured are classified, given codes and grouped within certain families. The similiarities systtem design attributes and manufacturing methods are exploited for the purpose of formation of part families. Process planning is concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product. Unlike a Variant Process Planning system that modifies gsnerative plans, each process plan could be defined automatically, independent of past routings.
Product lifecycle management Workflow technology Information technology management Industrial computing. The retrieval CAPP system offers lots of flexibility as one can do lots of editing and changes as per the requirements.
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. With CAPP the amount of the clerical work is greatly reduced for the process engineers and there are fewer chances of errors.
Whether one is using the retrieval system or the generative system, there are number of benefits of CAPP as described below: 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.
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 system allows new products to be brought on line quickly based on their manufacturability. Groover and Emory W.
Module G:Computer Aided Process 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. There are two major components of generative CAPP; a geometry based coding scheme and process knowledge in form of decision logic data. Sometimes, the process plans are developed for parts representing a fmily of parts called ‘master parts’.
The genwrative made from the computer are neat, clean and clear, which makes reading the routing sheets easier. Thus the process planning becomes logical, consistent and rationalized as it does not depends on the individualistic experience or judgment.
Systfm number of methods have been developed for part family formation using coding and classification schemes of group technology GTsimiliarity-coefficient based algorithms and mathematical programming models. CAPP integrates and optimizes system performance into the inter-organizational flow. Both these systems have been described below.
Process planning in manufacturing also refers to the planning of use of blanks, spare parts, packaging material, user instructions manuals etc. But now the computers are being used for manufacturing planning tasks. A typical CAPP frame-work is shown in figure Until recently, the whole process planning tasks were being done manually.