Моделирование рабочей нагрузки на технологическую систему станка с ЧПУ
Journal Title: Математичне моделювання - Year 2017, Vol 1, Issue 2
Abstract
SIMULATION OF WORKING LOAD ON TECHNOLOGICAL SYSTEM OF CNC MACHINE Korotkov V.S. Abstract During the operation of CNC machines many factors that affect the accuracy and quality of machined parts, reduce reliability of operation of machines on ensure the operating modes set in the control programs. Conducting scheduled inspections and repairs does not guarantee the conformity of the technical state of the machine with its passport data during the entire period of operation. The problem of ensuring high technological reliability of CNC machines is accompanied by obtaining reliable and timely information about the equipment and making of necessary measures for recovery of their characteristics. Information about the condition of the machine can be obtained by simulating the operating modes of the equipment and determining the reaction of the technological system to these actions. To process the results obtained, it is also necessary to develop a mathematical model. For carrying out tests for technological reliability the diagnostic device is under production conditions developed a diagnostic device for milling machines with a vertical arrangement of a spindle. It allows identify many important characteristics of CNC machines: positioning accuracy, size of spindle beating during load simulation, data on elastic deformations of machines units, etc. The device is made in the form of a separate unit, which is installed on the table of the machine. In the body of the device there is a measuring plate with contact bushings installed in it. The position of the plate and bushings in space is determined by the linear displacement meters. Hydraulic cylinders create an imitation of efforts on the machine. When the bushings and the mandrel are in contact, according to the control program, the plate is displaced in space. The size of shift is defined by measuring instruments. As a result, a test procedure was developed, based on the results of which it is possible to determine the main characteristics of the machine both in simulating workloads and without loads. If necessary, it is possible to perform tests to determine the individual characteristics that are of interest to the user. A mathematical model for the processing of test results has been developed. The model is based on the universal matrix of coordinate transformation. Calculation of the results occurs with the use of computer hardware. The use of the developed device in the production allows the express control of CNC milling machines for technological reliability. For the testing, no changes in the design of the machines are required. The information obtained can be used to create the conditions for effective use of equipment and reduce the cost of manufactured products. References [1] Bobrov A.N.,Perchenok J.G. Automated milling machines for bulk processing. – Leningrad., 1979. 231 p. [2] Brok A.M. Experience of use and perspectives of development of GPS for processing of hull details in mechanical engineering. Machines and tools. 1986, no 11. pp 10–11. [3] Dmitriev B.M., Chumeiko I.A. Evaluation of the machine's capabilities to ensure the accuracy of geometric dimensions. Machines and tools. 1978. no 5. pp 6–7. [4] Felchtain E.E. Machining of parts on CNC machines. Minsk. 2008. 299 p. [5] Pronikov A.S. Software Test Method for Metal-Cutting Machine Tools. Moscov. 1985. 288 p. [6] Korotkov V.S.,Zavazki V.L., Nechiporenko V.I. c.a. Ustrojistvo dlja opredelenija gestkosti stankov. [Device for determining the rigidity of machines]. Patent the USSR, no. 1426700, 1987. [7] Korotkov V.S., Jakimov A,V., Ivchenko N.S. c.a. diagnosticheskoe ustroistvo dlja ispitania frezernih stankov s programnim upravleniem. [Diagnostic device for testing of milling machines with programmable control]. Patent the USSR, no. 1328086, 1986. [8] Ligun A.A., Korotkov V.S., CHumeiko A.A., Zavazki V.L. Ob universalnji matrize dlja jpisania formoobrazovania poverhnostei v trehmernom prostransnve [On the universal matrix for describing the shaping of surfaces in three-dimensional space]. Kiev. 1988. 10 p.
Authors and Affiliations
В. С. Коротков
Keywords
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