D017 Design of Motion Accuracy Measurement Device with Three Displacement Sensors for Machine Tool and Comparison of its Setting Method

2013 ◽  
Vol 2013.7 (0) ◽  
pp. 523-526
Author(s):  
Masashi Yamaji ◽  
Yukitoshi Ihara
Keyword(s):  
Machine Tool ◽  
Measurement Device ◽  
Accuracy Measurement ◽  
Displacement Sensors

Design of Motion Accuracy Measurement Device for NC Machine Tools with Three Displacement Sensors

2011 ◽  
Vol 5 (6) ◽  
pp. 847-854 ◽  
Author(s):  
Yukitoshi Ihara ◽  
◽  
Yuki Hiramatsu
Keyword(s):  
Measurement Device ◽  
Coordinate Measurement ◽  
Accuracy Measurement ◽  
Test Standards ◽  
Machining Center ◽  
Displacement Sensors ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Measurement Devices ◽  
Five Axis

To measure motion accuracy, including that of the rotary axis of five-axis machining center that have been widely introduced into production sites recently, a device with three displacement sensors combined to measure the center position of the master ball was invented and will be added to the International Standard. Such measurement devices are not difficult to produce in principle, but the commercially available products are expensive. This study discusses a threedimensional (3D) coordinate measurement device with multiple displacement sensors, discussing it in terms of the test standards of the machines to which the device has been applied and in relation to devices which have been studied, developed, and released. Our measurement device is then designed and produced, and its measurement accuracy is confirmed.

Automatisierte Qualitätskontrolle*/Automated quality control - Presentation of an innovative stream finishing machine tool with an integrated optical measurement device

2015 ◽  
Vol 105 (06) ◽  
pp. 384-389
Author(s):  
E. Uhlmann ◽  
Y. Kuche ◽  
D. Oberschmidt ◽  
A. Löwenstein ◽  
S. Wiemann
Keyword(s):  
Quality Control ◽  
Machine Tool ◽  
Process Parameters ◽  
Optical Measurement ◽  
Measurement Device ◽  
Integrated Optical ◽  
Automated Quality Control ◽  
Milling Tools

Vorgestellt wird ein Maschinenprototyp zur Feinbearbeitung von Werkstückkanten und -oberflächen. Dieser verfügt über integrierte optische Messtechnik, die zur Kontrolle der Bearbeitungsergebnisse und gegebenenfalls zur automatisierten Nachbearbeitung eingesetzt werden kann. Mit dem Prototypen werden zum einen Fräswerkzeuge präpariert und zum anderen die Prozessparameter und deren Effekte analysiert. Abschließend beschreibt der Fachbeitrag einen Ansatz zur automatisierten Auslegung der Prozessparameter.   This paper presents a machine prototype for the finishing of edges and surfaces of work pieces. The prototype has an integrated optical measurement device, which can be used for the control of the process results and possibly automated remachining. The machine is used for the preparation of milling tools. Process parameters and their effects are analyzed and an approach for the automated setting of the process parameters is shown.

R-Test Analysis Software for Error Calibration of Five-Axis Machine Tools – Application to a Five-Axis Machine Tool with Two Rotary Axes on the Tool Side –

2015 ◽  
Vol 9 (4) ◽  
pp. 387-395 ◽  
Author(s):  
Soichi Ibaraki ◽  
◽  
Yu Nagai ◽  
Hisashi Otsubo ◽  
Yasutaka Sakai ◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Three Dimensional ◽  
Geometric Error ◽  
Test Analysis ◽  
Rotary Axes ◽  
Rotary Axis ◽  
Displacement Sensors ◽  
Error Calibration ◽  
Five Axis

The R-test measures the three-dimensional displacement of a precision sphere, attached to a machine spindle, by using three displacement sensors fixed to the machine’s table. Its application to error calibration for five-axis machine tools has long been studied. This paper presents software for analyzing the measured R-test trajectories for error diagnosis and numerical compensation for rotary axis location errors and error motions. The developed software first graphically presents the measured R-test trajectories to help a user intuitively understand error motions of the rotary axes. It also numerically parameterizes the rotary axis geometric error parameters, and then generates a compensation table that can be implemented in some latest-generation commercial CNC systems. An actual demonstration of its application to a five-axis machine tool with a universal head (two rotary axes on the spindle side) is presented.

Automatic Tracing and Measuring Crankpin Surface for the Initial Orientation in Non-Circular Grinding

2012 ◽  
Vol 569 ◽  
pp. 683-687
Author(s):  
Nan Yan Shen ◽  
Jing Li ◽  
Xin Ling Wang
Keyword(s):  
Machine Tool ◽  
Uniform Distribution ◽  
Phase Angle ◽  
Cylindrical Surface ◽  
Initial Orientation ◽  
Measurement Device ◽  
Machining Precision ◽  
Touch Trigger Probe

It is essential to transform machine tool coordinate to workpiece coordinate accurately before grinding for the uniform distribution of grinding allowance to ensure the high machining precision of each crankpin’s profile and phase angle in non-circular grinding. To position the crankshaft with the even grinding allowance of each crankpin, the strategy for controlling touch trigger probe to realize the automatic tracing measurement for crankpin cylindrical surface is researched based on the measurement device using coordinate measuring principle.

A Novel Method for Roll Error Measurement of a Linear Worktable of a Machine Tool

2011 ◽  
Vol 697-698 ◽  
pp. 301-304
Author(s):  
L. Han ◽  
Da Wei Zhang ◽  
Liang Yu Cui
Keyword(s):  
Machine Tool ◽  
Sensor Fusion ◽  
Error Estimation ◽  
Low Cost ◽  
Estimation Algorithm ◽  
Error Measurement ◽  
Fusion Technology ◽  
Displacement Sensors ◽  
Signal Simulation ◽  
Novel Method

This paper proposes a multi-step and multi-probe method to measure the roll error of a linear worktable during its movement. Two displacement sensors are used and two measurement steps are employed. Compared with two displacement sensors and a sensing target with high flatness method or a method using autocollimator, this method is in low cost and easier to be carried out. In proposed system, the slope information of roll error is obtained by sensor fusion technology. Roll error estimation algorithm is derived, and sequential-two-point method is used to sample sensors’ signal. Simulation and experimental results show the feasibility of the proposed method.

Experimental Method to Evaluate Unbalance Vibration for Machine Tool Spindle Integrated with Automatic Balancer

2013 ◽  
Vol 391 ◽  
pp. 398-401
Author(s):  
Hong Wei Fan ◽  
Min Qing Jing ◽  
Heng Liu
Keyword(s):  
Machine Tool ◽  
Dynamic Performance ◽  
Vibration Signal ◽  
Characteristic Parameter ◽  
Automatic Generation ◽  
Analysis Method ◽  
Displacement Sensors ◽  
Machine Tool Spindle ◽  
Signal Analysis Method ◽  
Peak Value

Unbalance is one of the main vibration sources of rotating machinery. Study on the response of unbalance is important for the machine tool spindle dynamic performance evaluation and balancing technology. How to simulate the unbalance automatic generation and how to effectively analyze the unbalance vibration signal are two main problems. In this paper, an electromagnetic balancer is used to act as the unbalance generator to imitate the tool unbalance during machine tool operation. An integrated spindle with the balancer is developed and the acceleration and displacement sensors are applied to pick up the unbalance vibration. The filtering, linear FFT and averaging are applied to extract the fundamental component from the original signal. The displacement peak-peak value and acceleration peak value are chosen as the characteristic parameter evaluating unbalance response and the shaft orbit is adopted to recognize unbalance intuitively. The experimental results show that the unbalance simulation and signal analysis method are feasible and effective.

A Stochastic Approach to the Measurement and Analysis of Leadscrew Drive Kinematic Errors

1984 ◽  
Vol 106 (4) ◽  
pp. 339-344 ◽  
Author(s):  
Hong Zan Bin ◽  
K. Yamazaki ◽  
M. F. DeVries
Keyword(s):  
Machine Tool ◽  
Position Control ◽  
Angular Displacement ◽  
Moving Average ◽  
Arma Model ◽  
Stochastic Approach ◽  
Adequate Model ◽  
Accuracy Measurement ◽  
Autoregressive Moving Average Model ◽  
Kinematic Errors

A practical way to achieve machine tool drive system accuracy is through compensation in the position control loop. Various strategies have been developed in which the compensation data are stored either in a computer or by alternative techniques. The approach described in this paper demonstrates how the dominant causes of the inaccuracies in machine tool drive systems can be determined in a simple and straightforward manner and how the compensation data can be generated using a microprocessor-based calibration technique. The proposed method was demonstrated on a Giddings & Lewis Model 10V Numericenter and consists of three major steps: 1) accuracy measurement, 2) error-map representation, and 3) error-map analysis and error cause diagnosis. Accuracy measurement was accomplished by reading both the resolver counts and the output of a laser interferometer which served as a reference (master) scale. The procedure is based on a strategy in which small 0.5 mm (0.020 in.), highly accurate ±2.5 μm ( ± 0.0001 in.) linear displacements of the machine tool table motion are taken as the measurement reference. An ARMA (Autoregressive Moving Average) model of order (16, 15) is the statistically adequate model that fit the data of the angular displacement of the resolver. The Dynamic Data System technique was used for this purpose and it can also be used to represent the error-map function. A spectral analysis of the ARMA model revealed the sources of the kinematic errors.

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