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.

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.

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.

Analysis of Thermal Error Model of Ball Screw Feed System Based on Experimental Data

2021 ◽  
Author(s):  
Jiancheng Yang ◽  
Changyou Li ◽  
Mengtao Xu ◽  
Yimin Zhang
Keyword(s):  
Experimental Data ◽  
Thermal Expansion ◽  
Machine Tool ◽  
Thermal Deformation ◽  
Axial Direction ◽  
Ball Screw ◽  
Machining Parameters ◽  
Feed System ◽  
The Impact ◽  
Screw Feed

Abstract In order to investigate the effect of thermal expansion on the ball screw feed system (BSFS) of a precision machine tool, theoretical modeling of and experimental study on thermally induced error are focused in this paper. A series of thermal experiments are conducted on the machine tool to measure the temperature of the main heat source and measuring points of BSFS. To classify the main heat sources and discuss the impact on the ball screw feed system separately. By the experimental data of ball screw system, the thermal model of screw shaft in the axial direction is analyzed and verified. Based on the heat generation and transfer analysis of ball screw system, thermal expansion of screw shaft in the axial direction is modeled mathematically. In addition, by analyzing the effects of machining parameters such as rotational speed, preloads and lead, we get the parameter influence of BSFS’s temperature rising and thermal deformation. This work can help us reduce thermal deformation effectively, and improve the precision of CNC machining.

Dynamic Characteristics Analysis of a Combined Gantry Milling Machine

2011 ◽  
Vol 105-107 ◽  
pp. 553-560
Author(s):  
Duan Wei Shi ◽  
Can Pei Liu ◽  
Zhi Yuan Wang ◽  
Yan Zhang ◽  
Xiao Qing Sun
Keyword(s):  
Harmonic Analysis ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Dynamic Stiffness ◽  
Joint Stiffness ◽  
Ball Screw ◽  
Fe Model ◽  
Milling Machine ◽  
Feed System ◽  
Characteristics Analysis

The FE model of a combined gantry milling machine was constructed. The joint stiffness of bolt fastening, ball screw, and roller guideway were calculated. The static analysis, modal analysis and harmonic analysis of the whole machine were carried out. The results indicated that the static stiffness and minimum dynamic stiffness of the spindle could satisfy the accuracy requirements of milling, but the stiffness of the X-axis feed system was comparatively low, while the stiffness of the rest and the cross-beam could be relatively abundant. The result of “considering joint stiffness” modal analysis was more accurate than “unconsidering joint stiffness”, especially the 5th-order natural frequency had a difference of up to 52.2%. The harmonic analysis result showed that the response amplitude of the spindle center was comparatively large in three directions when the 1st-order and the 17th-order natural frequency were working, so the frequencies should be avoided while working.

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