Finite Element Analysis on Thermal Characteristic of the Headstock of NC Machine Tool

Zhang, Yao Man; Liu, Qi Wei; Han, Jia Liang

doi:10.4028/www.scientific.net/amr.291-294.2302

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…It is the main stressed component of a machine tool. The reliability, cutting stability, and machining accuracy of a machining center largely depend on the structure and dynamic characteristics of the headstock [1]. The FEM (Finite Element Method) analysis and experiment analysis are two major methods to study the structure and dynamic characteristics of the machine tools [2,3].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center

Zhang

Chen

et al. 2016

MSF

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Dynamic characteristics of numerical control (NC) machine tools, such as natural frequency and vibration property, directly affect machining efficiency and finished surface quality. In general, low-order natural frequencies of critical components have significant influences on machine tool’s performances. The headstock is the most important component of the machine tool. The reliability, cutting stability, and machining accuracy of a machining center largely depend on the structure and dynamic characteristics of the headstock. First, in order to obtain the natural frequencies and vibration characteristics of the headstock of a vertical machining center, modal test and vibration test in free running and cutting conditions were carried out by means of the dynamic signal collection and analysis system. According to the modal test, the first six natural frequencies of the headstock were obtained, which can not only guide the working speed, but also act as the reference of structural optimization aiming at frequency-shift. Secondly, by means of the vibration test, the vibration characteristics of the headstock were obtained and the main vibration sources were found out. Finally the corresponding vibration reduction plans were proposed in this paper. That provides the reference for improving the performance of the overall unit.

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Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center

Zhang

Chen

et al. 2016

MSF

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“…(3) Performing the test by running the spindle at 90% of full speed for 400 h, in the meantime, recording the displacements of the table on the x-and y-axes and spindle nose on the z-axis. (4) Activating the compensation module to remove the displacement error due to temperature rise. …”

Section: Application Of Compensation Modulementioning

confidence: 99%

“…According to the studies [1,2], thermal deformations may be responsible for 40%-70% of geometrical inaccuracies of machine tools. To reduce the influence of the thermal induced errors, some techniques associated with the compensation schemes have been developed and implemented in the machine tools, including implementation of thermally symmetrical machine design [3][4][5], the introduction of additional cooling systems [6,7] and thermal deformation compensation [8][9][10]. Although optimization designs of machine tool structure are an effective way to reduce thermal errors, thermal displacement cannot be completely avoided since the external and internal heat sources under varying operating conditions cannot be accurately predicted at the design stage.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Compensation for Thermal Errors of the Milling Machine

et al. 2016

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This paper is focused on developing a compensation module for reducing the thermal errors of a computer numerical control (CNC) milling machine. The thermal induced displacement variations of machine tools are a vital problem that causes positioning errors to be over than 65%. To achieve a high accuracy of machine tools, it is important to find the effective methods for reducing the thermal errors. To this end, this study first used 14 temperature sensors to examine the real temperature fields around the machine, from which four points with high sensitivity to temperature rise were selected as the major locations for creating the representative thermal model. With the model, the compensation system for controlling the displacement variation was developed. The proposed model has been applied to the milling machine. Current results show that the displacement variations on the x-and y-axes and the position error at the tool center were controlled within 20 µm when the compensation system was activated. The feasibility of the compensation system was successfully demonstrated in application on the milling operation.

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Finite Element Analysis on Thermal Characteristic of the Headstock of NC Machine Tool

Cited by 2 publications

References 7 publications

Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center

Dynamic Characteristics Analysis for the Headstock of a Vertical Machining Center

Real-Time Compensation for Thermal Errors of the Milling Machine

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