A study on improvement of ball screw system positioning error with liquid-cooling

Xu, Zhe-Zhu; Liu, Xiaojing; Choi, Chong-Hun; Lyu, Sung-Ki

doi:10.1007/s12541-012-0288-8

Cited by 33 publications

(14 citation statements)

References 14 publications

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“…In addition to the thermal compensation method, the oilcooling method was applied to enhance the precision of the position of the spindle and lead screw in a machine tool, in order to extract the generated heat from the components by heat exchange [8], [9]. Currently, oil cooling with a constant flow rate (COV) has been adopted in machine tools, in which the flow rate of cooling oil supplied to the machine tool is constant and cannot be adjusted according to the variation in the heat generated by the machine tool.…”

Section: Temperature Difference T Imentioning

confidence: 99%

Enhancement of Machining Accuracy Utilizing Varied Cooling Oil Volume for Machine Tool Spindle

Luo

Hong

et al. 2020

IEEE Access

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In this study, varied cooling oil volume (VOV) control was developed for the oil coolant of a machine tool. This allows adjustment of the oil circulation flow rate in terms of the machining loads and rotational speeds of the spindle to remove the generated heat effectively from the spindle. A mathematical model of the cooling oil flow rate in terms of the rotating speed and torque of the spindle for VOV method is developed. From the thermal deformation experiments with the VOV method, the thermal deformations in both the Y-axis and Z-axis can be greatly reduced, by 70.1 % and 73.5 %, respectively, in variable rotational speed operation with a short operational period (10 minutes). Moreover, the VOV method was applied to shorten the required warm-up time of the spindle. The required warm-up time of the spindle can be shortened by 50 %, while the three axes of the spindle attain stable thermal conditions. In practical machining experiments, the machining accuracy with the VOV method can be greatly enhanced by 34 % to 62 % in comparison with the current case of constant cooling oil volume (COV). The VOV control system in the machine tool spindle can effectively reduce the thermal deformation and shorten the required warm-up time. In addition, the machining accuracy can be greatly enhanced. INDEX TERMS Thermal deformation, thermal suppression, varied cooling oil volume, machining accuracy.

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Section: Temperature Difference T Imentioning

confidence: 99%

Enhancement of Machining Accuracy Utilizing Varied Cooling Oil Volume for Machine Tool Spindle

Luo

Hong

et al. 2020

IEEE Access

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“…The variation of radial thermal expansion of the feed screw nuts is so minor that it may be ignored [43]. In the ball screw system, the heat generation sources are the nuts and 2 bearings, and the heat loss sources are liquid cooling and surface convection (shown in Figure 4) [44,45]. The thermal balance equation can be expressed by…”

Section: Heat Generated In the Feed Screw Nutsmentioning

confidence: 99%

“…where f 0n is a factor related to the nut type and method of lubrication, v 0n is the kinematic viscosity of the lubricant, n n is the screw rotation velocity, and M n is the total frictional torque of the nut (preload and dynamic load) [44].…”

Section: Heat Generated In the Feed Screw Nutsmentioning

confidence: 99%

“…Mayr, et al [46], established the equivalent thermal network model of the ball screw with an analytical method. Xu, et al [44,47], discovered that, in the case of a large stroke, the heat produced by the moving nut was dispersed on a larger scale than in other cases, so the screw cooling method has better deformation performance than the nut cooling method. Conversely, in the case of a small stroke, the thermal deformation performance of the nut cooling method is better than that of the screw cooling method.…”

Section: Heat Generated In the Feed Screw Nutsmentioning

confidence: 99%

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Actualities and Development of Heavy-Duty CNC Machine Tool Thermal Error Monitoring Technology

Zhou

Gui

Tan

et al. 2017

Chin. J. Mech. Eng.

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Thermal error monitoring technology is the key technological support to solve the thermal error problem of heavy-duty CNC (computer numerical control) machine tools. Currently, there are many review literatures introducing the thermal error research of CNC machine tools, but those mainly focus on the thermal issues in small and medium-sized CNC machine tools and seldom introduce thermal error monitoring technologies. This paper gives an overview of the research on the thermal error of CNC machine tools and emphasizes the study of thermal error of the heavy-duty CNC machine tool in three areas. These areas are the causes of thermal error of heavy-duty CNC machine tool and the issues with the temperature monitoring technology and thermal deformation monitoring technology. A new optical measurement technology called the ''fiber Bragg grating (FBG) distributed sensing technology'' for heavy-duty CNC machine tools is introduced in detail. This technology forms an intelligent sensing and monitoring system for heavy-duty CNC machine tools. This paper fills in the blank of this kind of review articles to guide the development of this industry field and opens up new areas of research on the heavy-duty CNC machine tool thermal error.

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“…An active control system requires a complex system and the speed of the nut is much greater than the heat transfer speed, which can lead to failure of the compensation system. Hollow and liquid-cooled ball screws have a good compensation effect [23,24], but the hollow design reduces the stiffness of ball screws. Therefore, an adaptive thermal deformation reduction method of ball screws based on CFRP is proposed in this research.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Method to Reduce Thermal Deformation of Ball Screws Based on Carbon Fiber Reinforced Plastics

et al. 2019

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In high-speed precision machining, thermal deformation caused by temperature rise affects the accuracy stability of the machine tool to a significant extent. In order to reduce the thermal deformation of ball screws and improve the accuracy, a new adaptive method based on carbon fiber reinforced plastics (CFRP) was proposed in this study and the thermal deformation of ball screws was determined. By using the sequential coupling method, the thermal–structural coupling analysis of a ball screw was conducted based on the finite element method (FEM). The analysis results were verified through a comparison with the experimental results. Based on the verification, an FE model of the improved ball screw was established to study its thermal characteristics. The key design parameters of the improved ball screw were optimized based on the Kriging model and genetic algorithm (GA). The thermal reduction effect of the improved ball screw was validated through the experimental results. The results indicate that the adaptive method proposed in this research is effective in reducing the thermal deformation of ball screws.

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A study on improvement of ball screw system positioning error with liquid-cooling

Cited by 33 publications

References 14 publications

Enhancement of Machining Accuracy Utilizing Varied Cooling Oil Volume for Machine Tool Spindle

Enhancement of Machining Accuracy Utilizing Varied Cooling Oil Volume for Machine Tool Spindle

Actualities and Development of Heavy-Duty CNC Machine Tool Thermal Error Monitoring Technology

Adaptive Method to Reduce Thermal Deformation of Ball Screws Based on Carbon Fiber Reinforced Plastics

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