Development of a multi-step measuring method for motion accuracy of NC machine tools based on cross grid encoder

Du, Zhengchun; Zhang, Shujie; Hong, Maisheng

doi:10.1016/j.ijmachtools.2009.11.010

Cited by 65 publications

(34 citation statements)

References 28 publications

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“…With the trend of industry 4.0 and intelligent production, many experts have devoted efforts to incorporate intelligent technology into machine tools [1][2][3][4][5][6][7][8]. The core technology of intelligent machine tools can detect temperature, vibration, and displacement, and can be controlled and compensated through algorithms for enhancing the processing performance [9,10].…”

Section: Introductionmentioning

confidence: 99%

Development of Dual-Axis MEMS Accelerometers for Machine Tools Vibration Monitoring

Huang

Chen

2016

Applied Sciences

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With the development of intelligent machine tools, monitoring the vibration by the accelerometer is an important issue. Accelerometers used for measuring vibration signals during milling processes require the characteristics of high sensitivity, high resolution, and high bandwidth. A commonly used accelerometer is the lead zirconate titanate (PZT) type; however, integrating it into intelligent modules is excessively expensive and difficult. Therefore, the micro electro mechanical systems (MEMS) accelerometer is an alternative with the advantages of lower price and superior integration. In the present study, we integrated two MEMS accelerometer chips into a low-pass filter and housing to develop a low-cost dual-axis accelerometer with a bandwidth of 5 kHz and a full scale range of˘50 g for measuring machine tool vibration. In addition, a platform for measuring the linearity, cross-axis sensitivity and frequency response of the MEMS accelerometer by using the back-to-back calibration method was also developed. Finally, cutting experiments with steady and chatter cutting were performed to verify the results of comparing the MEMS accelerometer with the PZT accelerometer in the time and frequency domains. The results demonstrated that the dual-axis MEMS accelerometer is suitable for monitoring the vibration of machine tools at low cost.

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Section: Introductionmentioning

confidence: 99%

Development of Dual-Axis MEMS Accelerometers for Machine Tools Vibration Monitoring

Huang

Chen

2016

Applied Sciences

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“…Rehsteiner and Weikert [11] used this method to evaluate motion accuracy in machine tools. Du et al [12] developed a multi-step measuring method for motion accuracy in NC machine tools using a cross grid encoder and based on the kinematic error model of an NC machine tool. However, using these same macro-scale evaluation techniques to appraise machine-tool motion accuracy performance has disadvantages when applied to micro-scale.…”

Section: Introductionmentioning

confidence: 99%

“…When this method is used, it is not possible to measure the servo induced error in machine tools in small-radius circular test paths. On the other hand, laser interferometer results are significantly dependent on environmental conditions as the laser wave length depends on temperature, humidity, air pressure and air circulation [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of machine-tool motion accuracy using a CNC machining center in micro-milling processes

Vázquez

Gomar

Ciurana

et al. 2014

Int J Adv Manuf Technol

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The demand for micro holes, micro-moulds and micro forms continues to grow as high-tech industries demand miniaturized products. Sectors such as aerospace, microelectronics, medicine, and even the automotive sector, are just some examples of enterprises that are taking advantage of micro-manufacturing technologies. Within this framework, the need to adapt the knowledge of macro-scale manufacturing processes to micro-scale is evident. This paper evaluates, through theoretical principles and experimental work, the machine-tool motion accuracy of a medium machining centre specializing in the micro-milling of elliptical cavities on aluminium workpieces. Measurements were taken to evaluate: deviations and/or errors in geometric accuracy, and the geometric quality errors caused by motion control and control software. The results show that, due to the structure and inertia of the machine tool, acceleration and deceleration do indeed affect the accuracy and quality of the micro-part. Furthermore, errors from motion control and/or control software are present because differences in the moving carriages create instabilities.

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“…Based on the principle and structure, a traditional DBB is unsuitable for measuring the motion trajectories within a small area. As an expensive device, the KGB can test a general motion trajectory located on a plane perpendicular to the MC spindle with a fairly high accuracy [13]; however, for a motion trajectory located on other planes, the operation to set up the device on a tested MC is not only difficult and time-consuming but also requires some specific apparatus and jig to ensure the alignment precision between the optical head and encoder [14]. Therefore, the problem of precisely assessing the accuracy in a small size motion has not yet been satisfactorily resolved, and there have been few publications of systematic research on the error characteristics and causes of the trajectory in small size MC motions.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of the LM Device and Its Application to Precise Measurement of Motion Trajectories within a Small Range with a Machining Centre

Qiu¹,

Yue²,

Kubo³

et al. 2012

MME

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In order to apply the LM device previously developed to precisely measuring small motion trajectories located on the different motion planes, three major improvements are successfully performed under the condition of completely maintaining the advantages of the device. These improvements include 1) development of a novel connection mechanism to smoothly attach the device to the spindle of a machining centre; 2) employment of a new data sampling method to achieve a high sampling frequency independent of the operating system of the control computer; and 3) proposal of a set-up method to conveniently install the device on the test machining centre with respect to different motion planes. Practical measurement experiment results with the improved device on a machining centre sufficiently demonstrate the effectiveness of the improvements and confirm several features including a very good response to small displacement close to the resolution of the device, high precision, repeatability and reliance. Moreover, based on the measurement results for a number of trajectories for a wide range of motion conditions, the error characteristics of small size motions are systematically discussed and the effect of the movement size and feed rate on the motion accuracy is verified for the machining centre tested.

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Development of a multi-step measuring method for motion accuracy of NC machine tools based on cross grid encoder

Cited by 65 publications

References 28 publications

Development of Dual-Axis MEMS Accelerometers for Machine Tools Vibration Monitoring

Development of Dual-Axis MEMS Accelerometers for Machine Tools Vibration Monitoring

Evaluation of machine-tool motion accuracy using a CNC machining center in micro-milling processes

Performance Improvement of the LM Device and Its Application to Precise Measurement of Motion Trajectories within a Small Range with a Machining Centre

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