Fever Analysis and Engineering Applications of the Heavy Machine Tool's Main Bearing

2013 ◽  
Vol 690-693 ◽  
pp. 1983-1987
Author(s):  
Shui Sheng Chen ◽  
Shuang Qiang Li ◽  
Zhong Ping Hua ◽  
Chen Dai
Keyword(s):  
Machine Tools ◽  
Rolling Bearing ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Practical Application ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Main Bearing ◽  
Main Method ◽  
Heavy Machine

Large heavy-duty CNC machine tools commonly used rolling bearing as Main bearing. This paper analyses the causes of Main bearing fever deeply, pointing out the mechanism of the bearing heating; combined with the practical application of the TK6926 landing CNC milling and borings main bearing, putting forward the main method to reduce the rolling bearing fever and achieved good results.

Thermal Deformation Finite Element Analysis for the Ram of Heavy-Duty CNC Machine Tools

2012 ◽  
Vol 433-440 ◽  
pp. 7159-7164 ◽  
Author(s):  
Yong Lu ◽  
Gang Wei Cui ◽  
Dong Gao ◽  
Heng Chao Xiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tools ◽  
Thermal Deformation ◽  
Theoretical Data ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Element Analysis

The thermal deformation of ram system in a heavy-duty CNC milling-boring machine tool has a serious effect on its accurateness. This paper analyses quantificationally the temperature field and deformation field of the ram system, and gives the ram’s heat sources, calculating quantity of heat and transferring type of heat. And then a finite element analysis is performed, the analyzing results provide basic theoretical data for thermal error compensation in machine tools.

scholarly journals Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2913
Author(s):  
Rafał Gołębski ◽  
Piotr Boral
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Optical Microscope ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cylindrical Gears ◽  
Measuring Machine ◽  
Five Axis

Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium series. Today, special attention is paid to the technology of making gears using universal CNC (computer numerical control) machine tools with standard cheap tools. On the basis of the presented mathematical model, a software was developed to generate a code that controls a machine tool for machining cylindrical gears with straight and modified tooth line using the multipass method. Made of steel 16MnCr5, gear wheels with a straight tooth line and with a longitudinally modified convex-convex tooth line were machined on a five-axis CNC milling machine DMG MORI CMX50U, using solid carbide milling cutters (cylindrical and ball end) for processing. The manufactured gears were inspected on a ZEISS coordinate measuring machine, using the software Gear Pro Involute. The conformity of the outline, the tooth line, and the gear pitch were assessed. The side surfaces of the teeth after machining according to the planned strategy were also assessed; the tests were carried out using the optical microscope Alicona Infinite Focus G5 and the contact profilographometer Taylor Hobson, Talysurf 120. The presented method is able to provide a very good quality of machined gears in relation to competing methods. The great advantage of this method is the use of a tool that is not geometrically related to the shape of the machined gear profile, which allows the production of cylindrical gears with a tooth and profile line other than the standard.

scholarly journals A Low-Cost Vision-Based Monitoring of Computer Numerical Control (CNC) Machine Tools for Small and Medium-Sized Enterprises (SMEs)

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4506 ◽  
Author(s):  
Hyungjung Kim ◽  
Woo-Kyun Jung ◽  
In-Gyu Choi ◽  
Sung-Hoon Ahn
Keyword(s):  
Open Source ◽  
Machine Tools ◽  
Low Cost ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Smart Factory ◽  
Cnc Machine Tools ◽  
Shop Floor ◽  
Cnc Milling ◽  
Cnc Machine

In the new era of manufacturing with the Fourth Industrial Revolution, the smart factory is getting much attention as a solution for the factory of the future. Despite challenges in small and medium-sized enterprises (SMEs), such as short-term strategies and labor-intensive with limited resources, they have to improve productivity and stay competitive by adopting smart factory technologies. This study presents a novel monitoring approach for SMEs, KEM (keep an eye on your machine), and using a low-cost vision, such as a webcam and open-source technologies. Mainly, this idea focuses on collecting and processing operational data using cheaper and easy-to-use components. A prototype was tested with the typical 3-axis computer numerical control (CNC) milling machine. From the evaluation, availability of using a low-cost webcam and open-source technologies for monitoring of machine tools was confirmed. The results revealed that the proposed system is easy to integrate and can be conveniently applied to legacy machine tools on the shop floor without a significant change of equipment and cost barrier, which is less than $500 USD. These benefits could lead to a change of monitoring operations to reduce time in operation, energy consumption, and environmental impact for the sustainable production of SMEs.

scholarly journals Remanufacture of rotary tables for heavy duty machine tools

2020 ◽  
Vol 317 ◽  
pp. 03001
Author(s):  
Dan Prodan ◽  
Anca Bucuresteanu ◽  
Adrian Motomancea ◽  
Alina Ovanisof
Keyword(s):  
Experimental Research ◽  
Machine Tools ◽  
Cnc Machine Tools ◽  
Rotary Table ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Cnc Machines ◽  
Suspension Systems ◽  
Milling Machines

In this paper, the authors present some of the theoretical and experimental research conducted on the occasion of rotary tables remanufacturing for CNC machine tools belonging to Boring and Milling Machines family. They give the constructive solutions applied on CNC machines and the specific systems of guiding, locking and driving. The authors present also the modifications required when passing from CC variant to CNC variant in terms of locking - indexing systems and hydraulic suspension systems. The paper presents different achievements but insists particularly on the remanufacture of the rotary table with useful area 1700x2000 mm with longitudinal travel of 1000 mm (MRD 1700x2000/1000).

Non-Contact Device for Measuring Frequency Response Functions of CNC Machine Tools

Manufacturing ◽  
2003 ◽  
Author(s):  
Donald Esterling ◽  
F. Donald Caulfield ◽  
Aaron Kiefer ◽  
Gregory Buckner ◽  
Pavan Jaju
Keyword(s):  
Frequency Response ◽  
Machine Tools ◽  
High Speed ◽  
Operating Conditions ◽  
Modal Testing ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Machining Processes ◽  
Test Procedures

The frequency response function (FRF) of a CNC machine tool is composed of tool/toolholder/spindle dynamics, and plays an important role in determining the stability of high speed machining processes. This paper details the design, development and operational verification of a non-contacting, controllable, electromechanical actuator (EMA) for measuring the FRFs of tools mounted in CNC milling machines. Although standard modal testing methods are available and provide similarly accurate results, these test procedures are difficult to perform in machine shop environments and can require expensive equipment. The EMA developed as part of this research extends the capabilities of the NIST “best speeds device” to provide controllable, non-contacting excitation for modal tests on machine tools. This EMA device offers the advantages of being accurate, easy to use, and applicable to a wide variety of tools and operating conditions.

scholarly journals An Approach for Error Allocation of Heavy-duty CNC Machine Tools

2017 ◽  
Author(s):  
Zi-ling ZHANG ◽  
Li-gang CAI ◽  
Zhi-feng LIU ◽  
Qiang CHENG ◽  
Yin QI
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Heavy Duty ◽  
Cnc Machine

scholarly journals CNC machine tools for low cost micro devices manufacturing

2004 ◽  
Vol 2 (01) ◽  
Author(s):  
E. Kussul ◽  
L. Ruiz-Huerta ◽  
A. Caballero-Ruiz ◽  
A. Kasatkin ◽  
L. Kasatkina ◽  
...  
Keyword(s):  
Machine Tools ◽  
First Generation ◽  
Applied Research ◽  
Technological Development ◽  
Low Cost ◽  
New Technology ◽  
Cnc Machine Tools ◽  
Practical Application ◽  
Cnc Machine ◽  
Micromechanical Devices

A new technology for production of low-cost micromechanical devices is proposed. This technology is based on concepts already known in conventional mechanics, used to produce a number of equipment of smaller sizes generation after generation. It is necessary to adapt each generation of equipment to the changes in physical behavior due to the decreasing scale. This technology is developed in the context of the microfactory creation. The main requirements for microequipment development are discussed. Also, the micromachine tool prototypes belonging to the first generation are developed and tested in the Laboratory of Micromechanics and Mechatronics of the Center of Applied Research and Technological Development, UNAM. The equipment characterization is one. The microfilter design and fabrication is described as an example of the practical application.

Measurement and Analysis of Static Friction for Feed Drives of CNC Machine Tools

2010 ◽  
Vol 36 ◽  
pp. 86-95 ◽  
Author(s):  
Syh Shiuh Yeh ◽  
Jin Tsu Sun
Keyword(s):  
Machine Tools ◽  
Static Friction ◽  
Cnc Machine Tools ◽  
Fast Fourier Transformation ◽  
Physical Interaction ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Feed Drive ◽  
Feed Drives ◽  
Measurement And Analysis

Static friction generally exists in feed drive servomechanisms and usually affects the motions of CNC machine tools. In this study, the breakaway experiment is applied to measure the static friction of a feed drive servomechanism generally used in CNC machine tools, and the spectral analysis using the fast Fourier transformation algorithm is applied to analyze the frequency characteristics of the obtained static friction. Several experiments were carried out on a three-axis CNC milling machine so as to illustrate the feasibility of the developed measurement and analysis methods. The experimental results indicate that the static friction of a feed drive servomechanism is clearly position-dependent and the physical interaction of the mechanical parts in the transmission system used by the feed drive servomechanism significantly affects the characteristics of the static friction.

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