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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Published by Prentice-Hall of India Pvt. 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. Development of a standard process plan 4. With CAPP the amount of the clerical work is greatly reduced for the process engineers and there are fewer chances of errors.

The planning begins with engineering drawings, specifications, parts or material lists and a forecast of demand. This suggests a system in which design information is processed by the process planning system to generate manufacturing process details.

The retrieval CAPP system offers lots of flexibility as one can do lots of editing and changes as per the requirements. 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.

The results of the planning are:. 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. It is the duty of the manufacturing engineer within the company to write the process plans for the new part designs to be manufactured in the machine shop.

Groover and Emory W. Solutions had the flexibility to change over time based on the ability to satisfy agile manufacturing criteria. Process planning is concerned with determining the sequence of individual manufacturing operations needed to produce a given part or product.

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.


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Process planning is very time-consuming and the results vary based on the person doing the planning”. 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. One has to give certain inputs to the systems like detailed description of the part to be manufactured.

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. All the three tasks: The term generayive production planning ” is used in different contexts on different parts of the production process; to some extent CAPP overlaps with the term “PIC” production and inventory control.

Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers

The level of detail is much greater in a generative system than a variant system. Computer Aided Process Planning.

Management and Technology”, p. This CAPP system synthesizes the design of the optimum process sequence based on the analysis of the part geometry, material and other relevant parameters.

Traditional CAPP methods that optimize plans in a linear generativr 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. To make the proper sequence the operations are documented on a form known as the route sheet.

Until recently, the whole process planning tasks were being done manually. 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.

In the generative process planning systems new plan is made automatically from scratch for each part xystem the computers, without involving human assistance. In Discrete Manufacturing, Art-to-Part validations have generatie performed often, but when considering highly volatile engineering designs, and multiple manufacturing operations with multiple tooling options, the decisions tables become longer and the vector matrices more complex.

Computer-aided process planning – Wikipedia

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.


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.

Definition of coding scheme 2. Unlike a Variant Process Planning system that modifies existing plans, each process plan could be defined automatically, independent of past routings.

This system can be used to generate process plan for rotational, prismatic and sheet-metal parts.

Computer Aided Process Planning (CAPP) Manufacturing Capacity Planning by Computers

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 parameters are used to produce multidimensional differential equations. Due to this there are differences in the sequence of the machining operations developed by different planners.

It provides for the planning of the process to be used in producing a designed part. Process planning translates design information into the process steps and instructions to efficiently and effectively manufacture products. 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’.

However, the individual engineers have their own opinions about what constitutes the best routing for the manufacture of a job. 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.

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. The CAPP software can be easily integrated with the other software like designing and manufacturing software. Views Read Edit View history.

The variant process planning approach can be realized as a four step process; 1. In the retrieval type of CAPP system the various parts to be manufactured are classified, given codes and grouped within certain families.