Kun-Ying Li

National Chin-Yi University of Technology · Graduate Institute of Precision Manufacturing

In modern buildings, windows and facades are significant sources of energy inefficiency that account for 40% of the energy cost of the entire building due to the thermal energy loss during both summer and winter in terms of heat gain and heat loss. This further increases the energy expenditure of the heating, ventilation, and air-conditioning (HVAC...

This study developed a method that leverages generative artificial intelligence and automated computer-aided design (CAD) technologies for the design of automotive wheel rims. First, numerous two-dimensional (2D) wheel rim designs are automatically generated by inputting prompts into Stable Diffusion, an image generation model, without predefining...

The heat generated by the transmission system in the gear-driven spindle module of the machine tool not only influences the overall temperature field but also induces an excessive rise in temperature of gears tooth flank or rolling contact surface resulting in thermal deformation. In this study, high torque geared spindle was adopted to investigate...

The study aims to enhance the machining accuracy and reduce the energy consumption of a computer numerical control (CNC) machine. A multiobject cooling control system was devised that can effectively remove the generated heat of two operational spindles in parallel arrangement by employing a varied coolant volume control method. In the multiobject...

Machine tool (MT) accuracy is an important factor in the industry and is affected by heat generation through internal and external moving parts; the electrical components used; and variable environmental temperatures. Thermal errors lead to 40–60% of all MT errors. To improve MT accuracy, efficient techniques to minimize thermal errors must be iden...

Machining dynamics plays an essential role in machine tools (MTs) and machining operations, directly impacting the material removal rate, surface quality, and dimensional accuracy. With the increasing use of numerical control (NC) MTs and increasing automation of production, machining inaccuracy due to thermal deformation has become a significant i...

As of 2022, most automatic deburring trajectories are still generated using offline programming methods. The trajectories generated using these methods are often suboptimal, which limits the precision of the robotic arms used to perform automatic deburring and, in turn, results in workpiece dimensional errors. Therefore, despite advances in automat...

In the precision processing industry, maintaining the accuracy of machine tools for an extensive period is crucial. Machining accuracy is affected by numerous factors, among which spindle thermal elongation caused by an increase in machine temperature is the most common. This paper proposed a key temperature point selection algorithm and thermal er...

In this study, special ceramic grinding plates impregnated with diamond grit and other abrasives, as well as self-made lapping plates, were used to prepare the surface of single-crystal silicon carbide (SiC) wafers. This novel approach enhanced the process and reduced the final chemical mechanical planarization (CMP) polishing time. Two different g...

Machine tools are an indispensable part of the modern manufacturing industry, by which many items are produced. In the manufacturing process, machining accuracy is very important for the precision of products. However, the thermal error accounts for 40-70% of the machining error. Most of the machine tool heat created during machining originates fro...

In this study, a multifunctional air and water source heat pump system was developed with a parallel refrigerant piping arrangement, which possessed six operational functions: space cooling (SC), space heating (SH), water heating (WH), water cooling (WC) and two composite operational modes. The two composite operational modes were the SC/WH mode an...

In this study, silica gel and sodium polyacrylate desiccants are coated onto a finned tube heat exchanger (Desiccant Coating Heat Exchanger, DCHE), which can absorb the vapor in the process air for dehumidification. In the experiments, the desiccant is coated on fins using the dense coating method, which causes the fixed fin area to be coated with...

This study presents a multiphysics simulation analysis that was performed for the cooling channel of a built-in spindle. The design of experiments (DOE) method was employed to optimize the dimension of the cooling channel, and a practical machining experiment was performed to validate the effect of the design. In terms of the temperature, pressure...

The generating heat from bearings and a motor of a built-in high rotating speed spindle of a machine tool has to be dissipated to attain high machining accuracy. In this study, a machine tool with a coolant cooling system for a high rotating speed spindle was investigated. The cooling channel designs in terms of channel pattern and dimensions by th...

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...

A built-in high-speed spindle of the machine tool is composed of bearings and motor, in which the generating heat dissipation is essential for high precision machines. In this study, a machine tool with a coolant cooling system for a high rotating speed spindle is investigated. First, the cooling channel designs in terms of channel pattern and dime...

In this study, the thermal deformation of a machine tool structure due to the heat generated during operation was analyzed, and embedded cooling channels were applied to exchange the heat generated during the operation to achieve thermal error suppression. Then, the finite volume method was used to simulate the effect of cooling oil temperature on...

In the machining process of machine tools, great amount of heat generating in the high rotational speed spindle due to friction effect can result in the thermal deformation and affect the machining precision sincerely. The resultant heat has to be removed effectively during the machining process, in order to attain high machining precision of the p...

This study investigated the ambient environmental temperature effect on the positioning accuracy of a periodically-moving carrier. The moving carrier was operated in an environmental chamber in which the operational temperature could be controlled by an air conditioning system. Different operational temperature modes, including a stable environment...

This study focuses on a type of intelligent machine tool - Thermal Error Compensation Technology. Lathes are used to rotate a cylindrical workpiece against fixed tools. The high speed of rotation and frequent changes to the cutting load can result in heat deformation which will reduce the accuracy of the relative position between the tool and the w...

The design methodology of the machine tools for reducing the volumetric errors is presented. Volumetric errors are the positional errors of the cutting points in space representing the accuracy of the machine tool. These volumetric errors are derived from the geometric errors of each axis, including the squareness errors, angular errors, and straig...

In general, the error of machine tool cutting process could be generated due to thermal deformation, which has scale range from 40% to 70%. Hence, thermal behavior of machine tools can be used as a significant reference to determine accuracy and stability. In this paper, the cooling fluid is proposed in order to reduce thermal error by conducting h...

Abbé error is the inherent systematic error in all numerically controlled (NC) machine tools due to the fact that the displacement measuring axis is not in line with the cutting axis. Any angular error of the moving stage will result in the position offset from the commanded cutting point. The positioning error of any cutting point in space is call...

Abbé error is the inherent systematic error in all numerically controlled (NC) machine tools due to the fact that the displacement measuring axis is not in line with the cutting axis. Any angular error of the moving stage will result in the position offset from the commanded cutting point. In this report, a new concept of multi-sensor feedback syst...