scholarly journals Study of In-Situ Dynamic Balancing of Spindle- Chuck Assembly of CNC Lathe

2012 ◽  
pp. 11-15
Author(s):  
Vinay.V. N
Keyword(s):  
Machine Tool ◽  
High Speed ◽  
Dynamic Properties ◽  
Cnc Machine ◽  
Motorized Spindle ◽  
Spindle Shaft ◽  
Cnc Lathe ◽  
Machine Spindle ◽  
And Performance ◽  
Technology Level

The motorized spindle plays an important role in high-speed machining. The level and performance of CNC machine tool are decided and evaluated by a technology level of motorized spindle and its performance. Then it is necessary and significant to find efficient and convenient ways for the research of motorized spindle. The machine spindle system is one of the most important parts of a machine tool since its dynamic properties directly affect the cutting ability of the machine tool. The dimensions of the spindle shaft, location, stiffness of the bearings and bearing preload affect the vibration free operation of the spindle. Angular contact ball bearings are most commonly used in high-speed spindles due to their low-friction properties and ability to withstand external loads in both axial and radial directions.

Numerical Simulation Analysis of Temperature Field for Motorized Spindle of High-Grade CNC Machine Tool Based on ANSYS

2010 ◽  
Vol 455 ◽  
pp. 33-36 ◽  
Author(s):  
C.Q. Li ◽  
Xiao Dong Zhang ◽  
Q. Zhang ◽  
H. Li
Keyword(s):  
Temperature Field ◽  
Machine Tool ◽  
High Speed ◽  
Thermal Deformation ◽  
Simulation Analysis ◽  
Transient Temperature ◽  
High Grade ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Motorized Spindle

To solve the problems that the thermal deformation of the High-Grade CNC machine tool has much effect on accuracy and quality of the produces, the structure characteristics of the high speed motorized spindle is firstly introduced in this paper. Then one type of motorized spindle and supporting structure are selected, and the thermal boundary parameters are calculated. Much more the static and transient temperature field are simulated by using FEA software ANSYS in one working condition. At last, the main measures to improve the uneven temperature field and the plans to reduce the thermal deformation are put forward, which are provided some technical bases for the equipment to achieve the high-speed and high-precision machining.

Recent Patents on the Structure of High-Speed Motorized Spindle

2019 ◽  
Vol 12 (2) ◽  
pp. 125-137
Author(s):  
Ye Dai ◽  
Wen-Qiang Wei ◽  
Xue-Liang Zhang ◽  
Yun-Shan Qi
Keyword(s):  
Research And Development ◽  
Machine Tool ◽  
High Precision ◽  
High Speed ◽  
Numerical Control ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Motorized Spindle ◽  
The Core ◽  
Spindle Structure

Background: As one of the core components of high-speed CNC machine tool, high-speed motorized spindle is the core functional component of high precision CNC machine tool, which has become the key research and development object of the world. Objective: By comparing and discussing the patents of high-speed motorized spindle, some valuable conclusions have been drawn to predict the future research and development of high-speed motorized spindle. Methods: By analyzing the characteristics of high-speed motorized spindle structure, the influence of high-speed motorized spindle on high-speed machining technology was explicated. Combining with the key technology of high-speed motorized spindle, the patents related to high-speed motorized spindle structure were used for investigation. Results: With the rapid development of high-speed cutting and numerical control technology and the need of practical application, the requirement for high-speed spindle performance has increased. Motorized spindle technology has the characteristics of high speed, high strength, high power, high torque and low speed, high precision, high reliability and long life, offering diversified bearing and lubrication cooling methods and serving as an intelligent system. Conclusion: The different levels of improvement and renovation of the structure with high-speed motorized spindle, by adding lubrication and cooling device to the spindle have improve the performance of spindle, addressing the loopholes in the technology and making it more practical.

Design of Damped Structures to Increase Machine Tool Dynamical Performance

2018 ◽  
Author(s):  
Francesco Aggogeri ◽  
Alberto Borboni ◽  
Angelo Merlo ◽  
Nicola Pellegrini ◽  
Riccardo Adamini ◽  
...  
Keyword(s):  
Machine Tool ◽  
Hybrid Materials ◽  
High Speed ◽  
Material Selection ◽  
Dynamic Properties ◽  
Structure Design ◽  
Machining Time ◽  
Reinforced Plastic ◽  
Innovative Materials ◽  
And Performance

The demand of ultra-high precision (UHP) machining is growing word-wide, driving the study and development of new solutions to increase the machine tool (MT) functionalities and performance. This trend has generated a request of smart, flexible and faster MTs that are able to reduce machining time and improve the final accuracy. The material selection in MT structure design and building may play a fundamental role to satisfy the customer’s requirements. In addition, the application of innovative materials in today’s technology may solve many issues that affect the machining quality due to static, dynamic and thermal behaviors. This paper presents a set of hybrid materials that may be used to fabricate the moving parts of a machine tool. The proposed solutions aim to guarantee lightness, capacity to damp vibrations and high stiffness limiting static and dynamic issues. The study focuses on four types of hybrid materials: sandwich structures based on Aluminium Foam, in open and closed cells configuration, sandwich panels with a corrugated core and Carbon Fiber Reinforced Plastic (CFRP) materials. A number of prototypes (milling MT ram – z axis) has been designed, manufactured and tested for high speed applications, evaluating both static and dynamic properties and highlighting potential advantages, drawbacks and new opportunities respect to conventional materials (e.g. iron, steel).

scholarly journals Modeling of Position-, Tool- and Workpiece-Dependent Milling Machine Dynamics

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Christian Brecher ◽  
Marcel Fey ◽  
Matthias Daniels
Keyword(s):  
Machine Tool ◽  
High Speed ◽  
Dynamic Properties ◽  
Major Effect ◽  
Modeling Framework ◽  
Milling Tool ◽  
Milling Machines ◽  
Engagement Process ◽  
Coupling Approach ◽  
Interpolation Strategy

AbstractDepending on the machine design, milling machines can show a significant variation of their dynamic properties with respect to the axes configurations, in particular at high speed spindle rotations and high feedrates. Moreover, the workpiece and the milling tool are critical parts of the machine tool and can have a major effect on the dynamic properties. Certain combinations of milling tool,workpiece, tool engagement, process parameters and axes configurations can come along with undesired forced or self-excited vibrations. So far, planning of milling processes usually does not account for these unwanted vibrations. The focus of this paper is to present a modeling framework, which accounts for the abovementioned influences via simulation. The dynamic properties of various workpieces and tools as well as the dynamic properties for many different axes configurations are stored in databases. Based on these databases, the dynamics of any given machine tool configuration can be simulated efficiently based on a substructure coupling approach and an interpolation strategy.

Stability and Control of Tooling System for High-Speed Machining

2014 ◽  
Vol 684 ◽  
pp. 375-380
Author(s):  
Deng Sheng Zheng ◽  
Jian Chen ◽  
D.F. Tao ◽  
L. Lv ◽  
Gui Cheng Wang
Keyword(s):  
Natural Frequency ◽  
High Speed ◽  
System Stability ◽  
Finite Model ◽  
High Speed Machining ◽  
Cnc Machine ◽  
And Performance ◽  
The Stability ◽  
Tooling System ◽  
And Control

Tooling system for high-speed machining is one of the key components of high-end CNC machine , its stability and reliability directly affects the quality and performance of the machine. Based on the finite element method, developing a 3D finite model of high-speed machining tool system, studying on the stability of the high Speed machining tool from the natural frequency by the method of modal analysis. Analysis the amount of the overhang and clamping of the tooling , different shank taper interference fit and under different speed conditions, which affects the natural frequency of high-speed machining tool system. Proposed to the approach of improving system stability, which also provides a theoretical basis for the development of new high-speed machining tool system.

Thermal Characteristics Finite Element Analysis and Temperature Rise Experiment for High Speed Motorized Spindle

2011 ◽  
Vol 52-54 ◽  
pp. 1206-1211 ◽  
Author(s):  
Huai Xing Wen ◽  
Mei Yan Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tool ◽  
Temperature Rise ◽  
High Speed ◽  
Thermal Characteristics ◽  
Analysis Model ◽  
Ansys Software ◽  
Motorized Spindle ◽  
Element Analysis

The thermal characteristics of the motorized spindle determines maching qualities and cutting capabilities, and is one of the important factors influencing the precision of the high speed NC machine tool. To improve the performance of the high speed machine tool, it is important to study the thermal characteristics of the motorized spindle. It had been studied in two ways: one is finite element analysis by Ansys software, in which the finite element analysis model was built. According to the actual working condition, the heat source and the heat transfer coefficient of every part are calculated. On this basis, the temperature field and temperature rises were gotten in Ansys software. The other way is temperature rises experiment on the motorized spindle test platform. The result was shown in the form of curve. These two ways shown the same result: the highest temperature rise appears in the area of electromotor, then followed by the rolling bearing .The result provides the necessary theory basis for optimizing the structure of the motorized spindle and establishes a basis for the research and application about the high speed spindle.

An Implementation of Intelligent CNC Machine Tools

2010 ◽  
Vol 44-47 ◽  
pp. 557-561 ◽  
Author(s):  
Chen Sheng Wang ◽  
Tjamme Wiegers ◽  
Joris S.M. Vergeest
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Tool Design ◽  
Cnc Machine Tools ◽  
Preliminary Evaluation ◽  
Machining Efficiency ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Machine Tool Design ◽  
Cnc Lathe

Improving the machining efficiency of CNC machine tools by introducing intelligence is now gaining more attention from both researchers and entrepreneurs. Based on the assessment of existing strategy of intelligent machine tool design, an implementation and preliminary evaluation of an intelligent CNC lathe has been reported in this paper. Techniques discussed in this paper are expected to benefit CNC machine tool researchers and designers in terms of the development of intelligent CNC machine tools.

Finite Element Analysis for Static Behaviour of the CNC Turning Machine Spindle

2014 ◽  
Vol 555 ◽  
pp. 555-560 ◽  
Author(s):  
Doru Bardac ◽  
Constantin Dogariu
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
High Speed ◽  
High Performance ◽  
Element Model ◽  
Design Activity ◽  
Element Analysis ◽  
Spindle System ◽  
Machine Spindle ◽  
Main Spindle

This paper presents a method to investigate the characteristics of a turning high-speed spindle system. The geometric quality of high-precision parts is highly dependent on the performance of the entire machining system,especially by the main spindle behaviour. The machine tool main spindle units is focused on direct driven spindle units for high-speed and high performance cutting. This paper analyzes the static behavior for a turning machine spindle and presents some activities to improve the CAD model for such complex systems. The proposed models take into account the spindle with the detailed bearing system. The analysis was performed during the design activity and was based on Finite Elements Method. Starting from the 3D designed model, using FEM done by means of ANSYS analysis the structure stiffness was evaluated and, by consequence, the influence on the machine tool precision. The aim of this paper is to develop a finite element model of the machine spindle system and to use this method for design optimization. The 3D model was designed using the SolidWorks CAD software. The static analysis was completed by modal, harmonic response and thermal analysis, but their results will be presented in other papers.

Experimental Study on Backlash Compensation of CNC Machine Tool

2012 ◽  
Vol 580 ◽  
pp. 419-422 ◽  
Author(s):  
Xiao Long Shen ◽  
Jia Ying Hu ◽  
Ming Jun Zhang ◽  
Lai Xi Zhang
Keyword(s):  
Machine Tool ◽  
Evaluation System ◽  
High Speed ◽  
Basic Feature ◽  
Geometric Error ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Position Accuracy ◽  
Different Types ◽  
Types Of Error

The backlash compensation has a great effect on the synthetical precision of CNC machine tool. Here, the measuring and backlash compensating technologies were investigated for high-speed CNC machine tool. Following, the backlash compensation of the synthetical geometric error of the interpolatimg movement and the evaluation system of position accuracy were proposed during CNC machine tool processing. The results indicate that the basic feature of error is established and provides a basis for putting forward the new error measurement method under the essential measuring condition. It also could be applied for different types of error compensation, shows that the backlash of the milling processing could be well compensated.

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