The development of the computer-aided design system for production processes of component part machining for single-piece production and repair conditions (original) (raw)
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Manufacturing Activities Modelling for the Purpose of Machining Process Plan Generation
Advances in Intelligent Systems and Computing
The idea of modelling the manufacturing activities is presented in the paper. The main goal was to realise the procedure of machining process plan generation using semi-generative method of CAPP system build. This method requires to use the expert system. The manufacturing knowledge is determine by machining process plan template, in the form of hierarchical networks, and production rules where the definition of manufacturing activities is mandatory. Moreover the classification and formal description of manufacturing activities is also included. This formalization let us to define manufacturing capabilities of manufacturing system resources and is also used in workpiece features identification and transformation. The new definition of machining process as an ordered set of activities is introduced. During the machining process the intermediate states of workpiece are generated. Also the manufacturing system model in the form of objects and vector of its state is given. The described activities cause the intended discrete change of manufacturing system and workpiece state.
Analyzing possibilities of improving machinning process planning and optimization
Main activities of the technological preparation of production refer to the process planning and optimization. Process plans as the most significant objects of optimization in production systems are characterized by variant solutions in all stages, from the selection of raw material and manufacturing technologies, types and sequences of processes and machining operations, types and characteristics of manufacturing resources, machining parameters and strategies, with machining time, cost, accuracy and surface quality as main objective functions of process planning optimization. Main goal of this paper is to analyze the possibilities of improving technological preparation of production, or precisely, to improve process planning and optimization of manufacturing process plans through the application of feature technologies and the considered simulation technique. The application of feature technologies will be analyzed from the aspect of possible integration of product design and process planning, while the application of the simulation technique within the CAD/CAM system will test the influence of variants of machining operations and machining strategies on the process planning optimization from the aspect of machining time. process planning, optimization, feature technologies, simulation technique Two basic activities within the product development are product design and product manufacturing which ought to be integrated and connected at the greatest possible extent. Technological preparation of production represents the main integr that should meet design requirements of product designers on one hand, and to adopt manufacturing possibilities of production on the other hand [1]. Main activity of the technological preparation refers to the manufacturing process planning and optimization. The imperative of modern global production is to generate rational and optimal process plans, in accordance with the basic optimization criteria such as productivity, cost-effectiveness, machining accuracy and surface quality [2]. Process planning represents the complex multi-dimensional problem that depends on the input data and set requirements according to the observed product/s, as well as the techno-economic conditions and subjective preferences of the product designer. The most important input data for process planning are product drawings which possess information about materials, dimensions, machining accuracy, surface quality, production volume and available manufacturing resources, such as raw materials, machines, tools, fixtures, measuring instruments etc. Accordingly, various process plans can be predicted for the same manufacturing conditions and which can be evaluated using various optimization criteria [3]. ng conditions, modern CAD programming systems based on feature technologies, or the application of features in modeling, are mainly used for product design and for defining technological documentation. However, the attention of product designers is focused on realizing functional characteristics of products and parts, whereby they use features in modeling which generally do not match the typical manufacturing features. By that, the process planning, as well as the integration of CAD, CAPP and CAM systems is more difficult to achieve [4]. According to above mentioned, the first task of this paper is related to the analysis of possibilities of modeling products by applying features that match with manufacturing features which are used in machining processes. In this way, it is intended to facilitate the manufacturing process planning, as well as the integration of activities of product design and process planning through direct application of features from CAD systems to machining process within CAM systems.
Feature-based generation of machining process plans for optimised parts manufacture
Journal of Intelligent Manufacturing, 2012
Efficacious integration of such CAx technologies as CAD, CAM and CAPP still remains a problem in engineering practice which constantly attracts research attention. Design by feature model is assumed as a main factor in the integration effort in various engineering and manufacturing domains. It refers principally to feature clustering and consequently operation sequencing in elaborated process plan designs. The focus of this paper is on CAPP for parts manufacture in systems of definite processing capabilities, involving multi-axis machining centres. A methodical approach is proposed to optimally solve for process planning problems, which consists in the identification of process alternatives and sequencing adequate working steps. The approach involves the use of the branch and bound concept from the field of artificial intelligence. A conceptual scheme for generation of alternative process plans in the form of a network is developed. It is based on part design data modelling in terms of machining features. A relevant algorithm is proposed for creating such a network and searching for the optimal process plan solution from the viewpoint of its operational performance, under formulated process constraints. The feasibility of the approach and the algorithm are illustrated by a numerical case with regard to a real application and diverse machine tools with relevant tooling. Generated process alternatives for complex machining with given systems, are studied using models programmed in the environment of Matlab software.
Manufacturing preparation by use of product model in computer
Robotics and Computer-Integrated Manufacturing, 1984
This paper describes the general concept and the framework of a product model for design and manufacturing preparation. Machining preparation, such as process and operation planning, generation of NC cutter path, and geometrical and physical simulation of the machining operation, made by utilizing information stored in the preceding stages, are implemented at each stage. Finally the use of information is shown in a product model for off-line programming of robots and for geometric and physical simulation of robot operation.
Formal design of structure process in machining parts
Applied Mathematical Sciences, 2017
In article the theoretical aspects connected with selection of complete sets of technological bases for orientation semi-finished product at processing of details are considered. Simulation is based on a comprehensive consideration of the complete set of dimensional relationships between the surfaces of parts for all degrees of freedom simultaneously. The conditions of a formal search of technological bases for preparation of orientation, as well as the sequence of processing the workpiece surfaces are described.
A manufacturing support system for industrial part process planning
Balanced Automation Systems, 1995
Much research work has been carried out (and still is) on the development of Computer-Aided Process Planning (CAPP) systems as a means of bridging the gap between design and manufacture, aiming at an increase in production, higher production quality and lower costs. However, most of these works have been developed at research centers outside the factory. This commonly leads to the resulting CAPP system not being of efficient use on the shop-floor. Described within this paper is the architecture of a Manufacturing Support System for Process Planning, referred to as MSSPP, which is being developed as a cooperation between the Federal University of Santa Catarina (UFSC) and Schneider Logemann Cia. (SLC), a Brazilian company which produces machines for agricultural harvesting and planting. The system will support the process planner in the preparation of consistent and feasible process plans, taking into account the resources available at the shop-floor. It will also provide the simulation of the tool paths for machining.
Computers & Industrial Engineering, 1998
This paper describes the activities of Object-Oriented (OO) analysis that were implemented in order to obtain a high part representation level and to give sets of structured and hierarchical data to the Computer Aided Process Planning (CAPP) system. The OO modeling activities were carried out by using the Object-Oriented System Analysis (OOSA) method which allows careful specification of all the information contained inside the system. All the models used by this method have been described in detail to show how the OO database is defined and how it can be used by a generative CAPP system. The feature model proposed is defined by taking all the part information that can be recognized and extracted from the Computer Aided Design (CAD) model into account. The result is the design of an OO database which allows the CAPP system to use manufacturing features to define machining operation sequences of 3D workpieces. The approach proposed is generic enough to integrate any geometrical forms which can be recognized and identified from the CAD system. Hole geometry is taken as an example to show the link between the step of OO analysis and the step of knowledge representation in the Expert System which has been used to generate machining cycles. The OO database presented makes up a real solution of CAD/CAPP/CAM integration by using feature modeling.
Mapping and design of information processing for machining of individualized components
Procedia CIRP, 2019
In today's business environment, the trend towards more product variety and customization is unbroken. Due to this development, the need of agile and reconfigurable production systems emerged to cope with various products and product families. To design and optimize production systems as well as to choose the optimal product matches, product analysis methods are needed. Indeed, most of the known methods aim to analyze a product or one product family on the physical level. Different product families, however, may differ largely in terms of the number and nature of components. This fact impedes an efficient comparison and choice of appropriate product family combinations for the production system. A new methodology is proposed to analyze existing products in view of their functional and physical architecture. The aim is to cluster these products in new assembly oriented product families for the optimization of existing assembly lines and the creation of future reconfigurable assembly systems. Based on Datum Flow Chain, the physical structure of the products is analyzed. Functional subassemblies are identified, and a functional analysis is performed. Moreover, a hybrid functional and physical architecture graph (HyFPAG) is the output which depicts the similarity between product families by providing design support to both, production system planners and product designers. An illustrative example of a nail-clipper is used to explain the proposed methodology. An industrial case study on two product families of steering columns of thyssenkrupp Presta France is then carried out to give a first industrial evaluation of the proposed approach.
Technology for complex parts machining in multiproduct manufacturing
2019
At present, the speed of production and its complexity increases with each passing year due to the shorter product life cycle and competition in the global market. This trend is also observed in the machine-building industry, therefore, in order to ensure the competitiveness of enterprises and reduce the cost of production, it is necessary to intensify production. This is especially true in the machining of complex parts that require a great number of setups, and technological equipment. The problem-oriented analysis of complex parts was carried out, the parts classification was structured and developed according to the design and technological features. This made it possible to offer advanced manufacturing processes for complex parts like levers, forks, and connecting rods. The flexible fixtures for specified complex parts were developed. The effectiveness of the proposed manufacturing processes,