scholarly journals DEVELOPMENT OF A HIGH-SPEED MIRROR-LIKE FINISH POLISHING TECHNOLOGY FOR MINUTE PARTS BASED ON A LINEAR MOTOR

2019 ◽  
Vol 19 (1) ◽  
pp. 71-85
Author(s):  
Ikuo TANABE ◽  
Valerio DE SOUSA GAMA ◽  
Yoshifumi ISE ◽  
Hiromi ISOBE ◽  
Satoshi TAKAHASHI
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Linear Motor ◽  
Motor Drive ◽  
Milling Machine ◽  
Machining Time ◽  
Flat Surfaces ◽  
Linear Motors ◽  
High Acceleration ◽  
Nc Milling

As high speed, high acceleration and stable drive on machine tools is constantly growing in demand, the use of linear motors in machine tools has increased. On the other hand, in order to achieve a high degree of quality, the need for mirror-like finish surfaces on industrial products has also considerably increased. This research explores the use of linear motors to develop a high-speed fine polishing process that achieves a mirror-like finish surface on small parts. The first stage of this process consisted in developing a polishing device, which was composed of a NC milling machine, a linear motor drive and a polishing head. Specifically, a polishing head attached to a linear motor drive was coupled with the spindle of a NC milling machine. A substitute for a small linear motor drive was obtained from a commercially available shaver, while the polishing head was made of propylene. The polishing head elaboration process, linear motor drive properties, lapping agent and the optimum polishing conditions were investigated in several experiments. The evaluation consisted in the high-speed polishing of minute areas on flat surfaces using the selected optimum conditions. It is concluded that, (1) the proposed system was able to achieve a mirror-like finish surface, (2) when compared to polishing with an ultrasonic motor, the machining time of the proposed system was reduced by half, (3) the proposed system was able to achieve a mirror-like finish on a 3 mm square sided area.

Linear motor drive ultrahigh-speed injection moulding machine

2002 ◽  
Vol 216 (5) ◽  
pp. 773-781 ◽  
Author(s):  
Y-B Bang ◽  
S Ito
Keyword(s):  
Contact Force ◽  
Injection Moulding ◽  
High Speed ◽  
Linear Motor ◽  
Total Output ◽  
Inertia Force ◽  
Motor Drive ◽  
Direct Drive ◽  
Linear Motors ◽  
Moulding Machine

This paper presents a report on the development of a linear motor drive injection moulding machine for the attainment of ultrahigh-speed injection moulding. Until now it has been impossible to produce such a high speed with all-electric injection moulding machines, although the need for such ultrahigh-speed, electrically driven injection moulding machines has clearly existed. However, direct drive by linear motors may cause brief nozzle separation from the sprue bushing because of an inertia force as large as the total output thrust of the linear motors, and this momentary separation can cause molten plastic leakage. In this paper, two solutions are proposed for this inertia force problem. One is mechanical cancellation of the inertia force, the other is an increase in the nozzle contact force. Furthermore, a new nozzle contact mechanism is proposed that prevents the stationary platen bending caused by the nozzle contact force. Some experimental results on a manufactured all-electric, ultrahigh-speed injection moulding machine are presented.

Simulation and Experimental Investigation of Stiffness of the High Acceleration Linear Feed Drives

2010 ◽  
Vol 97-101 ◽  
pp. 3113-3119
Author(s):  
Ping Ma ◽  
Cheng Xiang Liao ◽  
Zhen Hui Chen ◽  
Gong Zhen
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Great Influence ◽  
Linear Motor ◽  
Current Loop ◽  
Linear Induction Motor ◽  
Feed Drive ◽  
Feed Drives ◽  
High Acceleration ◽  
Motorized Spindles

In high speed machining, the feed drives with high velocity and high acceleration are necessary to make full use of the capacities of the high speed motorized spindles. The linear motor feed drive eliminates any mid- transmitting mechanism, which cause achieved the high acceleration. In this paper, the GD-Ⅲ linear induction motor feed drive is introduced, and its controller is modeled and its stiffness has been investigated with simulation program MATLAB & SIMULINK. The influence of the parameters of the controller on the dynamic performance has also been analyzed. The simulation shows that the positional loop proportional gain kv, velocity proportional gain kp, velocity loop integral time constant Tn and the current loop proportional gain kpi have great influence on the dynamics of the linear motor feed drive. In the end, the simulation is verified by the experimental results.

A Novel Evaluation Method on the Precision of Linear Motor Feed System in High-Speed Machine Tools

2016 ◽  
Vol 836-837 ◽  
pp. 220-227 ◽  
Author(s):  
Xiao Jun Yang ◽  
Yan Li ◽  
Cheng Fang Ma ◽  
Dun Lv ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Mechanical System ◽  
Machine Tools ◽  
High Speed ◽  
Evaluation Method ◽  
Linear Motor ◽  
Feed System ◽  
Dynamic Precision ◽  
Transmission Structure ◽  
Accuracy And Repeatability ◽  
High Speed Machine

The linear motor feed system can realize high-precision motion with high-speed and high-acceleration, which has a broad application in high-speed machine tools. In its unique zero transmission structure, the motor is connected directly with the mechanical system. The thrust harmonics and other disturbances act on the motor mover directly, which makes the tracking fluctuation more prominent. The traditional accuracy and repeatability of positioning cannot reflect the precision of the linear motor feed system in the process of high-speed movement. In this paper, a novel precision evaluation method which takes the dynamic precision as the index is proposed for the linear motor feed system in high-speed machine tools. The performance and precision of linear motor feed system are evaluated by the transient error, steady-state follow error and tracking fluctuation, respectively. Then the servo control model is established oriented to dynamic precision. The influences of NC instructions, servo system and mechanical system on the dynamic precision are discussed. It can be obtained that this new evaluation method on the precision can evaluate systematically the performance of the linear motor feed system in high-speed machine tools. Meanwhile it can reveal efficiently main factors which lead to the decline of dynamic precision and propose effective improvement methods.

Research and Development of a Test Platform for Synthetic Performance Parameters of Linear Motors

2011 ◽  
Vol 383-390 ◽  
pp. 4486-4491
Author(s):  
Zhong Quan Luan ◽  
Hu Yan Ji ◽  
Qing Dong Yang
Keyword(s):  
Research And Development ◽  
High Precision ◽  
Virtual Instrument ◽  
High Speed ◽  
Linear Motor ◽  
Cnc Machine Tools ◽  
Performance Parameters ◽  
Cnc Machine ◽  
Linear Motors ◽  
Test Platform

Linear Motors have been used more and more widely in high precision and high-speed linear motion for CNC machine tools, but uniform testing standards and methods for linear motor performance have not been established in China. Based on the virtual instrument software platform by means of computer technology, research and development of the test platform for synthetic performance parameters of linear motors can realize the rapid and accurate measurement, automatic storage and processing of linear-motor output, currents, positions, temperatures and other performance parameters. , Meanwhile, the platform can also provide the technical direction for design or improvement of linear motors, and technically support the formulation of related standards. Experiments showed that the test platform for synthetic performance parameters of linear motors can achieve high precision and automatic measurement to meet the testing requirements for synthetic performance of linear motors.

Machine Tools Mechatronic Analysis

2006 ◽  
Vol 220 (3) ◽  
pp. 345-353 ◽  
Author(s):  
R Maj ◽  
F Modica ◽  
G Bianchi
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
High Performance ◽  
Dynamic Behaviour ◽  
Traditional Approach ◽  
Optimization Technique ◽  
Numerical Control ◽  
Milling Machine ◽  
Mechanical Structure ◽  
High Speed Machine

High-speed machine tools show close interaction between the dynamic behaviour of the mechanical structure, drives, and numerical control. In order to support the designer of high-performance machines, a new analysis based on an integrated holistic mechatronic optimization technique is proposed and compared with the traditional approach. The proposed approach is applied to a three-axis milling machine for dies and mould production.

Electrochemical Micro Drilling of Stainless Steel with Tool Electrode Jump Motion

2009 ◽  
Vol 626-627 ◽  
pp. 333-338 ◽  
Author(s):  
Zhuang Liu ◽  
Z.J. Qiu ◽  
C. Heng ◽  
Ning Song Qu
Keyword(s):  
Stainless Steel ◽  
Linear Motor ◽  
Machining Accuracy ◽  
Tool Electrode ◽  
Machining Time ◽  
High Acceleration ◽  
Micro Holes ◽  
Micro Drilling ◽  
Time Lead ◽  
Accelerating Motion

ECM micro drilling with tool electrode jump motion in cycles is introduced in this work. A linear motor is employed to carry tool to jump with high acceleration in cycles. Due to the high accelerating motion of tool electrode, the electrolyte within machining gap is able to be refreshed. The Z-axis feeding motor, linear motor and DC supplier are coupled in the experimental setup and a series of micro-holes are drilled on stainless steel (1Cr18Ni9Ti) plate with thickness of 0.5mm to investigate the presented process. Experimental results shows, cycle jump motion of tool electrode, higher jump acceleration, longer jump height and shorter cycle machining time lead to better machining accuracy.

Paper 6: Application of the Linear Induction Motor to High-Speed Transport

1966 ◽  
Vol 181 (7) ◽  
pp. 83-100 ◽  
Author(s):  
F. T. Barwell ◽  
E. R. Laithwaite
Keyword(s):  
Induction Motor ◽  
High Speed ◽  
Linear Motor ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Left Behind ◽  
High Speeds ◽  
High Acceleration ◽  
Air Resistance ◽  
Conventional Machine

High-speed ground transport (150 m/s) to be effective over limited distances also requires high acceleration. Were the power required to overcome air resistance and achieve adequate acceleration provided by conventional means, bulk and mass would be excessive. The linear induction motor offers considerable advantage at high speeds, it is not limited by centrifugal force and is independent of adhesion. A high overhead rating is possible as heat is left behind in the reaction rail. Output of a double-sided machine may be expected to reach 7 lb/in2 (44 500 N/m2) of effective pole face and the system is equally effective in braking. The principle of operation is described. To be efficient the current which is ‘in phase’ with the applied voltage must be made as large as possible compared with the magnetizing current, operation must be at low values of slip and the surface speed of the travelling field should be high. Thus a quantity known as the ‘goodness’ of a machine may be described by the expression where μ0 is permeability of free space; ρr is surface resistivity of rotor; p, pole pitch; g, total effective air gap in the magnetic circuit; and Vs is surface speed of travelling field = synchronous speed of vehicle. Because of the simplicity of the construction, g is necessarily larger than would be the case for a conventional machine and ρr is less favourable. However, these can be compensated for by increasing p with a suitable adjustment of frequency and the effect of the term Vs is such that the linear motor becomes better the higher the speed at which it is required to operate. Tests on a linear motor at Gorton are described and some of the mechanical problems of applying linear propulsion to railways are discussed.

Linear Motor Direct Drive Key Technology Problems and the Solution Countermeasures

2013 ◽  
Vol 411-414 ◽  
pp. 3052-3055
Author(s):  
Yao Bin Hu ◽  
Jing Xie ◽  
Liang Bin Hu
Keyword(s):  
High Speed ◽  
Supply Voltage ◽  
Linear Motor ◽  
Direct Drive ◽  
Key Technology ◽  
Linear Motors ◽  
Magnetic Attraction ◽  
Working Principle ◽  
And Performance ◽  
Gravity Acceleration

Linear motor direct drive with the advantages of simple structure, fast dynamic response, high precision, high speed, big acceleration, small noise and vibration, is the ideal transmission for all kinds of ultra-high speed and precision machine tool. This paper introduces the working principle and performance features of linear motors, and elaborates on the key technology problems and the solution countermeasures of seven aspects including the efficiency and the power factor, the cooling measure, the normal magnetic attraction, the servo-control, magnetism isolation and the protection, the gravity acceleration and the supply voltage of the linear motor.

Design and Analysis of a High Efficient Multi-Segment Redundancy Linear Motor

2020 ◽  
Vol 13 ◽  
Author(s):  
Chunyuan Shi ◽  
Jingang Jiang ◽  
Lei Wang ◽  
Wei Pan ◽  
Zili Tang ◽  
...  
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Linear Motor ◽  
Normal Direction ◽  
Magnetic Flux Density ◽  
Iron Core ◽  
Linear Motors ◽  
High Efficient ◽  
The One ◽  
Direction Component

Background: The electromagnetic aircraft launch system is used to assists the carrier aircraft to accelerate takeoff on a short distance on the flight deck. Linear motors are required to have high efficiency and thrust / volume ratio, as the actuator of the EMALS. In addition, linear motors were required have the fluctuation of the thrust is as small as possible to prevent impact and overstress on the airborne equipment. The thrust performance and thrust fluctuation suppression of linear motors are the current research hotspots in the field of EMALS. Objective: To improve the efficiency of the system, this paper proposes a multi-segment LPMSM. Methods: We design a decentralized primary structure based on the Autonomous Decentralized System (ADS) concept. Only the coils near the moving secondary are motivated during the launch process, the others could be released from being driven after the secondary slide over; this control will save the waste of energy. Results: A multi-segment linear motor is proposed to improve the efficiency of the EMALS. This motor consists of two sections - the one with iron core for the low speed process and the one without iron core for the high speed process. Conclusion: The normal direction component of the air gap magnetic flux density is much larger than that of the longitudinal component, and their values are 80-90% and 10-20% respectively. For the normal direction component, it is mainly affected by the third, seventh, and ninth harmonics. The accelerating and energy test results show that, in the accelerating process, the efficiency of the linear motor can be more than 90%, and the acceleration is stable.

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