IMPLEMENTATION OF INTEGRATED DESIGN SYSTEMS IN THE LEARNING PROCESS

The modern stage of development of CAD-systems is characterized by a significant expansion of the scope of their use. An interesting direction for improving CAD systems is their integration with CAM systems. One of the main tasks solved by CAM systems is the development of control programs for CNC machines. Many software developers for automation of design and technological preparation of production have already equipped their systems with appropriate modules. These circumstances pose an urgent task for higher educational institutions to introduce the study of integrated CAD/CAM systems into the educational process of training design engineers. In this case, the emphasis should be placed on the practical mastery of the skills of developing control programs using a 3D-model of the manufactured part. The stages of preparation for the implementation of the system are described, starting with the analysis of the market of necessary software products and ending with the adaptation of the licensed system to the conditions of use in the educational process of the university. A link is given to the description of the methodology used in the assessment of automated systems at the stage preceding the tender for their purchase. It is emphasized that the study of the possibility of using a CAD/CAM system in the preparation of design engineers was carried out by students during the course and diploma projects in the discipline “Automated systems for technological preparation of production”. The methodology for designing control programs used by students is given, and the results obtained are assessed.


Introduction
The modern stage of development of CAD-systems (Computer-Aided Design) is characterized by a significant expansion of the scope of their use. Now it is quite simple to obtain a 3D model of a part from a 2D drawing (and, vice versa), while it became possible to quickly and accurately determine a number of parameters, such as the weight of the part, its surface area, coordinates of the center of gravity and moments of inertia relative to the X, Y, Z axes. An interesting direction for improving CAD-systems is their integration with CAM-systems (Computer-Aided Manufacturing). One of the main tasks solved by CAM systems is the development of control programs for CNC machines.
Many software developers for automation of design and technological preparation of production have already equipped their systems with appropriate modules.
Firm "Ascon" has integrated into the system of three-dimensional modeling KOMPAS-3D module CNC, which allows you to receive control programs for various types of processing.
Firm "Top-Systems" has supplemented the T-FLEX CAD computer-aided design system with the T-FLEX CNC option.

Purpose of the study
These circumstances pose an urgent task for higher educational institutions to introduce the study of integrated CAD/CAM systems into the educational process of training design engineers. In this case, the emphasis should be placed on the practical mastery of the skills of developing control programs using a 3D-model of the manufactured part.
At the stage of choosing an automated system for obtaining control programs for further use in the educational process of the Sukhoi State Technical University of Gomel, the technique described in [9] was used.

The sequence of the research
Preparation for implementation in the educational process of designing using CAD/CAM systems consisted of the following stages: 1. Purchase of licensed software for 20 users, namely, T-FLEX CAD 3D and T-FLEX CNC 3D systems.
2. Installation and adaptation of the specified software to the conditions of use in the educational process of the Sukhoi State Technical University of Gomel.

ИНФОРМАЦИОННЫЕ ТЕХНОЛОГИИ В ОБРАЗОВАНИИ
3. Preparation of educational and methodological literature containing guidance on the use of a CAD / CAM system in course and diploma design. The features of this stage are described in [10].
The study of the possibility of using a CAD / CAM system in the training of design engineers was carried out by students of the specialty 1-53 01 01 "Automation of technological processes and production (by directions)" when performing a course project in the discipline "Automated systems for technological preparation of production" and when completing a diploma project.
The development of the control program was carried out in the T-Flex CAD computer-aided design system using the T-FLEX: CNC option.
To obtain the control program, the following steps were performed: 1. Using the "Tool Editor" command, a cutting tool with the required parameters was created and saved in a file with the ".too" extension ( Fig. 1); 2. On the toolbar, the command "Drilling 5D" was selected, and in it the name of the operation, the tool, the surface relative to which the machining is performed and the drilling parameters (depth, speed, feed, etc.). The results of this processing are shown in Fig. 2-4; 3. On the toolbar, the command "3D milling" was selected, and in it the name of the operation, the tool, the face that will be milled, the angle of inclination of the tool, the type of pass and the milling parameters (depth, speed, feed, etc.). The results of this processing are shown in Fig. 5-7; 4. To check the developed program, the "Processing simulator" command was launched, during which the tool path was presented in the form of a video; 5. The result obtained in the form of a control program presented in fig. 8 was saved in a file for transfer to the machine.
6. To check the developed program, the "Processing simulator" command was launched, during which the tool path was presented in the form of a video.

Conclusion
The introduction of an integrated design system into the educational process has shown not only the possibility of obtaining a control program for a CNC machine tool, but also the practical implementation of this possibility by students on the basis of licensed software. The results, in the form of control programs obtained in the course of diploma design using integrated CAD/CAM systems, were highly appreciated by the members of the State Examination Commission  Петухов Александр Владимирович -старший преподаватель кафедры «Технология машиностроения» учреждения образования «Гомельский государственный технический университет имени П. О. Сухого» Petuhov Aleksandr Vladimirovich Senior lecturer of the chair «Technology of mechanical engineering» of the Sukhoi State Technical University of Gomel. E-mail: Petukhov@tut.by