scholarly journals Diagnosis of machine tool with using Renishaw ball-bar system

2018 ◽  
Vol 157 ◽  
pp. 01006 ◽  
Author(s):  
Robert Čep ◽  
Šárka Malotová ◽  
Jiří Kratochvíl ◽  
Dana Stančeková ◽  
Andrej Czán ◽  
...  
Keyword(s):  
Machine Tool ◽  
Direct Method ◽  
International Standards ◽  
Cnc Milling ◽  
Whole Process ◽  
Cnc Milling Machine ◽  
Measurement Principle ◽  
Method Of Measurement ◽  
The Ideal

The article deals with accuracy of machine tools. The aim was to determine the accuracy with which already operates used machine – HAAS CNC Milling machine MiniMill. For evaluation of accuracy of the machine tool was used Renishaw QC20-W Ballbar system, which has the Department of Machining, Assembly and Engineering Metrology of VŠB – TUO. The theoretical part describes the measurement principle using a telescopic Ballbar system. The principle of measurement is the comparison of the actual deviation from the ideal circle which is programmed. Experimental part is focused on the diagnosis of the whole process by the direct method of measurement during changing feed rate. Specifically, the determination of circularity deviation at machine tool was in accordance with international standards, e.g. ISO 230-4.

Determination of Technological Forces in the Incremental Forming Process

2013 ◽  
Vol 371 ◽  
pp. 133-137
Author(s):  
Radu Eugen Breaz ◽  
Melania Tera ◽  
Octavian Bologa ◽  
Sever Gabriel Racz
Keyword(s):  
Image Processing ◽  
Theoretical Model ◽  
Data Acquisition ◽  
Incremental Forming ◽  
Single Point ◽  
Cnc Milling ◽  
Forming Process ◽  
Feed Drive ◽  
Cnc Milling Machine

The paper presents a joint theoretical and experimental approach to determine the technological forces within the asymmetric single point incremental forming ASPIF process, based upon a theoretical model, image processing and data acquisition. The first step of this approach was to develop a theoretical model of the forces within the process, based upon the model of a mechanical feed drive of a CNC milling machine. By means of this model, relationships between the resistant torque at the motor spindle level and the technological force on the movement axis could be determined. Using an image processing method, which allowed the user to extract information within the machines operator panel and analytical relationships, the technological forces were determined. The results were compared with the measured values, obtained by means of a data acquisition system.

scholarly journals Effect of Stiffness of Rolling Joints on the Dynamic Characteristic of Ball Screw Feed Systems in a Milling Machine

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Dazhong Wang ◽  
Yan Lu ◽  
Tongchao Zhang ◽  
Keyong Wang ◽  
Akira Rinoshika
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristic ◽  
Calculation Method ◽  
Ball Screw ◽  
Fe Model ◽  
Milling Machine ◽  
Cnc Milling ◽  
Feed System ◽  
Cnc Milling Machine ◽  
Screw Feed

Dynamic characteristic of ball screw feed system in a milling machine is studied numerically in this work. In order to avoid the difficulty in determining the stiffness of rolling joints theoretically, a dynamic modeling method for analyzing the feed system is discussed, and a stiffness calculation method of the rolling joints is proposed based on the Hertz contact theory. Taking a 3-axis computer numerical control (CNC) milling machine set ermined as a research object, the stiffness of its fixed joint between the column and the body together with the stiffness parameters of the rolling joints is evaluated according to the Takashi Yoshimura method. Then, a finite element (FE) model is established for the machine tool. The correctness of the FE model and the stiffness calculation method of the rolling joints are validated by theoretical and experimental modal analysis results of the machine tool’s workbench. Under the two modeling methods of joints incorporating the stiffness parameters and rigid connection, a theoretical modal analysis is conducted for the CNC milling machine. The natural frequencies and modal shapes reveal that the joints’ dynamic characteristic has an important influence on the dynamic performance of a whole machine tool, especially for the case with natural frequency and higher modes.

Dynamic Analysis of Key Parts of CNC Milling Machine Based on FEM

2012 ◽  
Vol 605-607 ◽  
pp. 1515-1518
Author(s):  
Wei Cong ◽  
Zhi Yong Zhang ◽  
Jiang Li ◽  
En Xiang Han
Keyword(s):  
Finite Element Method ◽  
Machine Tool ◽  
Response Analysis ◽  
Optimized Design ◽  
Milling Machine ◽  
Cnc Milling ◽  
Harmonic Response ◽  
Cnc Milling Machine ◽  
Harmonic Response Analysis ◽  
Vibration Modal

Taking the spindle of machine tool as example,the modal analysis and harmonic response analysis were done by means of finite element method. Find out its characteristics of vibration modal. The analysis is conducive to the design of the spindle of machine tool. It makes a base for optimized design and remanufacturing.

scholarly journals Analysis of accuracy of 5-axis CNC milling machine through standard and modified circular test

Mechanik ◽  
2018 ◽  
Vol 91 (10) ◽  
pp. 822-824
Author(s):  
Ryszard Wolny
Keyword(s):  
Machine Tool ◽  
Measuring System ◽  
Milling Machine ◽  
Cnc Milling ◽  
Standard Measuring ◽  
Cnc Milling Machine ◽  
Circular Test ◽  
Ball Bar ◽  
Modified Test

In analysis of accuracy of 5-axis CNC milling machine measuring system with telescopic kinematic ball bar was used. Standard measuring test was made. The modified test was proposed with application of investigated inclined basis. The obtained results were compared. The accuracy of machine tool in indirect way was evaluated.

scholarly journals DEVICE FOR INCREASING THE PRODUCTIVITY OF MILLING MACHINE OPERATION WITH CNC MCV-1000

2019 ◽  
pp. 73-79
Author(s):  
Iryna Koval’ova
Keyword(s):  
Machine Tool ◽  
Significant Role ◽  
Outer Surface ◽  
Milling Machine ◽  
Cnc Milling ◽  
Advantages And Disadvantages ◽  
Current Trends ◽  
Cnc Milling Machine ◽  
Simultaneous Processing ◽  
Increase In Productivity

Тhe work of the milling machine with the CNC MCV-1000 is considered. A device that significantly improves the productivity of this machine when performing the operation of milling round holes along the outer surface of the pipe with a certain step is shown. The results obtained by experimental means are indicated. Analysis of current trends in the development of machine tool industry indicates the need to increase the technical level of metalworking equipment with developed complexes of technological operations. A significant role is played by the equipment of metalworking machines, namely, specialized devices for various types of processing. The goal is to increase metalworking productivity. As a result of the analysis of existing devices revealed their advantages and disadvantages. A new design of the device for the simultaneous processing of four pipes with a length of up to 1000 mm and a diameter of 32 mm on a MCV-1000 CNC milling machine is proposed. This device is designed for reliable fixation of four pipes simultaneously for the operation of milling round holes along the outer surface of the pipe with a certain step. The introduction of this device showed a double increase in productivity compared with the previous device, which was used at the enterprise.

The Design of Feed Drive System of Economical CNC Milling Machine

2014 ◽  
Vol 701-702 ◽  
pp. 780-783
Author(s):  
Xiao Jing Yang ◽  
Jia Xin Wang
Keyword(s):  
Machine Tool ◽  
Drive System ◽  
Ball Screw ◽  
Milling Machine ◽  
Cnc Milling ◽  
Transmission Scheme ◽  
Feed Drive ◽  
Cnc Milling Machine ◽  
Functional Components ◽  
Feed Drive System

The feed drive system is important functional components which effects on precision and efficiency of transmission and cost of CNC milling machine tools. So the designe of the feed drive system of economical CNC milling machine tool is researched. Firtsly the general design scheme which includes the transmission scheme and basic parameters of CNC milling machine tool is determined. Then according to the milling force calculated during mill processing, linear rolling guide, ball screw and stepping motor of X axis and Y axis of feed drive system are respectively calculated, selected and checked in detail. Using the Solid works software for 3D modeling and assembly of mechanical parts of feed drive system, By the scheme comparison, selecting the CNC system of Huazhong century star HNC-21 and accomplishing the electrical connection of CNC system.The feed drive system of economical CNC milling machine in the desing is high performance and low cost,and meet accuracy requirement.

scholarly journals Determination of machining errors caused by dynamic deformations from process equipment

2018 ◽  
Vol 224 ◽  
pp. 01056
Author(s):  
Aleksandr Starikov ◽  
Ulyana Putilova ◽  
Olga Tempel
Keyword(s):  
Process Equipment ◽  
Milling Machine ◽  
Cnc Milling ◽  
Cnc Milling Machine ◽  
Machining Errors

A method for determining and inputting the correction value is presented based on the data obtained as a result of the diagnosis of a CNC milling machine during machining curvilinear surfaces.

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