An Innovative Approach to Increase the Accuracy of Multi-Axis Machines for Process-Intermittent Inspection

1996 ◽  
Vol 118 (4) ◽  
pp. 585-594 ◽  
Author(s):  
J. Mou ◽  
C. R. Liu
Keyword(s):  
Computer Simulation ◽  
Machine Tools ◽  
Search Algorithm ◽  
Error Modeling ◽  
Accurate Assessment ◽  
Accuracy Improvement ◽  
General Application ◽  
Machining Center ◽  
Minimum Number ◽  
Measurement Effort

A method for enhancing the effectiveness and robustness of process-intermittent inspection is presented. The method is developed first using mathematical models and measurements closely related to the real parts, thus reducing the uncertainty in both the error estimation and compensation for multi-axis machines. A predictive search algorithm is then developed to identify the minimum number of appropriate measuring points (with respect to the designated tolerance) for arbitrarily shaped manufacturing parts. The identified measuring points are robust in that they least sensitive to uncertainties in measurement and modeling. The search algorithm uses computer simulation with information obtained from previous measurements. Consequently, the measurement effort involved in error modeling has been greatly reduced. The error model derived from the method can be used to correct the process-intermittent probing data for a more accurate assessment of workpiece dimensions. Although the method is designed for general application in multi-axis machines (i.e., machine tools, robots, and coordinate measuring machines), this paper focuses on the specific application of a machining center. Experimental results demonstrate the effectiveness of the error modeling method for accuracy improvement of the machining center for process-intermittent inspection.

Thermal Error Modeling of Machine Tools Based on M-RAN

2011 ◽  
Vol 121-126 ◽  
pp. 529-533
Author(s):  
Jian Han ◽  
Li Ping Wang ◽  
Ning Bo Cheng ◽  
Xu Wang
Keyword(s):  
Machine Tool ◽  
Eddy Current ◽  
Machine Tools ◽  
Thermal Error ◽  
Error Modeling ◽  
Test Results ◽  
Thermal Errors ◽  
Machining Center ◽  
Machining Errors ◽  
Minimal Resource

Thermal error in machine tools is one of the most significant causes of machining errors. This paper presents a new modeling method for machine tool error. Minimal-resource allocating networks (M-RAN) are used to establish the relationships between the temperature variables and thermal errors. Pt-100 thermal resistances and eddy current sensors are used to measure the temperature variables and the thermal errors respectively. A machining center is used to experiment. The test results show that method with minimal-resource allocating networks can predict the thermal errors of the machine accurately.

MODERNIZATION AND STUDY OF THE DRIVE SYSTEM OF A MACHINING CENTER WITH COMPUTER NUMERICAL CONTROL

2020 ◽  
Vol 70 (1) ◽  
Author(s):  
Marin Zhilevski ◽  
Mikho Mikhov
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Machine Tools ◽  
Computer Numerical Control ◽  
Drive System ◽  
Numerical Control ◽  
Tabular Form ◽  
Machining Center ◽  
Electric Drive System ◽  
Selection Of

A generalized algorithm for selection of the electric drive system for a class of machining centers with computer numerical control is presented in this paper. The successive steps for the calculation of feed and spindle drives in scraping operations are shown in tabular form. The electric drive system for the considered class of ma-chines has been studied through computer simulation and on the basis of practical implementations with developed ladder diagrams. Research carried out and the results obtained can be used in the modernization of such type of machine tools.

Unified Multi-Error Model for Four Types CNC Machining Center

2013 ◽  
Vol 395-396 ◽  
pp. 1162-1169
Author(s):  
Kai Guo Fan ◽  
Jian Guo Yang ◽  
Li Yan Yang
Keyword(s):  
Machine Tools ◽  
Error Model ◽  
Error Modeling ◽  
Cnc Machining ◽  
Singular Function ◽  
The Past ◽  
Machining Center ◽  
Transmission Chain ◽  
The Mathematical Model ◽  
Cnc Machining Center

The error modeling compensation method for improvement the machine tools accuracy has been extensively used in the past decades. To unify the multi-error model for four types CNC machining center, the comprehensive multi-error model of TXYZ type machining center was established based on the homogenous coordinate transformation. According to the analysis of the transmission chain, a unified multi-error model for four types machining center was established based on the Singular Function. Using the unified multi-error model, the mathematical model of four types machining center can be standardized. It is very important for unceasing development of error compensation technology.

Linear electric motors in feed drives of multi-purpose machine tools

2020 ◽  
pp. 47-52
Author(s):  
A.A. Mahov ◽  
O.G. Dragina ◽  
P.S. Belov ◽  
S.L. Mahov
Keyword(s):  
Electric Motor ◽  
Machine Tools ◽  
Electric Motors ◽  
Linear Motors ◽  
Machining Center ◽  
Feed Drives ◽  
Selection Of

The possibility of using linear feed drives along the X and the Y axes in the portal-milling machining center is shown. The calculations of force indicators of drives, feed drives of traverse and carriage for two modes, as well as the selection of Siemens linear motors are given. Keywords milling machining center, drive, feed, linear electric motor. [email protected]

scholarly journals Peculiarities of the consultative training method for laboratory work classes

2016 ◽  
Vol 5 (1) ◽  
pp. 134-137
Author(s):  
Tatiana Nikolaevna Andryukhina
Keyword(s):  
Computer Simulation ◽  
Computer Graphics ◽  
Learning Process ◽  
Machine Tools ◽  
Teaching Method ◽  
Laboratory Work ◽  
Training Method ◽  
State Technical ◽  
Technical University ◽  
The Moment

The method of consultative instruction is promising for training of bachelors, masters and specialists, who possess professional competences. This method involves the active use of modern gadgets in the learning process of students. The professional competences of a specialist - readiness or ability to rationally and productively use knowledge, skills, habits, methods of activity, necessary for their professional sphere. The advisory teaching method is being tested for the teaching of future bachelors in the Department of Automated machine tools and tooling systems in the Samara State Technical University. The method is used for the preparation of laboratory lessons in such disciplines as Fundamentals of Computer Graphics and Computer simulation. These courses were selected for the experiment, since the curriculum sets out only four- hour laboratory works. The teacher gives theoretical input on the construction of sketches, drawings, models, parts and units from the moment the computer is switched on and the program for the simulation is started until the end of the laboratory work. The article highlights the positive aspects of the method of advisory training both for teachers and for students. The author specifies some restrictions for use of the advisory training method. The experiment has shown that while doing laboratory work the students were much more motivated, productive and creative.

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