The plate for the multi-stage reducer is a component of a traveling motor and is required for high wear resistance and maintaining precision. The plates that are mainly manufactured by the press process have burrs on the edges of the material after the general press shear process. Since burrs have a great influence on assembly and shape precision according to product characteristics, a post-treatment process for removing burrs is mandatory, and several studies have been conducted on this topic. In this study, a flattening process was developed to remove the burrs. First, the piercing and blanking process forming analysis was performed to find the process conditions for burr removal. Subsequently, the flattening process forming analysis was performed, and the reliability of the analysis was verified through an experiment using the derived process conditions.
In recent years, the machine industry has demanded high precision of the processed products and high efficiency of production due to the rapid development of technology. The grinding machine is being studied in many countries. The typical grinding machine is processed in the order of one side each. However, a 2-head simultaneous grinding machine processes both sides at the same time. Therefore, it has reduced processing time and improved precision. In this study, the overall structural analysis of a 2-head simultaneous grinding machine with high precision and high efficiency of productivity was performed. For high precision of the 2-head simultaneous grinding machine, the spindle taper angle was analyzed and optimized. When the spindle taper angle was 16 degrees, it had the highest chucking force. Therefore, the spindle had high precision as the spindle taper had the strongest force to chuck the collet. The analysis results can be applied to further develop the 2-head simultaneous grinding machine.
Citations
Citations to this article as recorded by
Research on Stiffness Analysis and Technology of the Heavy Spidle Top Yongkang Wang, Bingwei Gao, Wenlong Han, Shilong Xue Current Materials Science.2024; 17(5): 540. CrossRef
In recent years, machinery industries such as aerospace and automotive industries have adopted high-precision machining. Cutting fluids increase the tool life and productivity through cooling and lubricating the machinery during processing. However, the cutting oil causes environmental pollution while the reuse of waste fluids negatively affects the tool life and machining quality. Therefore, it is important to study cutting oil environmental reuse methods and develop eco-friendly equipment such as a DC (Dust cake) filter system. In this study, the structural analysis was done using finite element method (FEM) to verify the stability and a study of the DC filter frame design improvementdone. Based on the damage on the DC filter system, the cause of the damage was assessed and an improvement to the structure suggested. Finally, the structural stability of the improved design was verified through analysis. The results of this analysis could be applied in order to further research.
Due to the ever-advancing technology in various production industries, the materials of machined products have been diversified from simple steel materials to composite materials, powder metallurgy materials and silicon. Powder metallurgy materials have excellent mechanical/chemical properties, but have disadvantages such as; difficulty in processing using conventional processing methods, increased processing cost and generation of a large amount of dust. In addition, the need for the development of specialized machine tools increases due to the disadvantages such as the frequent occurrence of burrs in tapping and drilling. In order to solve the problem of machining of high hardness sintered products, a method of maximizing productivity and efficiency by processing the powder metallurgy material before it is completely sintered is being studied. In this study, structural analysis of a turret center for the verification of structural stability of a turret center for processing powder metallurgy materials was carried out. In addition, the shape was optimized to improve the structural stability and weight and presented an optimal model. The study aimed at developing more reliable turret center through the optimized model.
Citations
Citations to this article as recorded by
Automatic Measurement of Nanoimage Based on Machine Vision and Powder Metallurgy Materials Zhenghong Jiang, Chunrong Zhou, Haichang Zhang Advances in Materials Science and Engineering.2022; 2022: 1. CrossRef
Shape Optimization for Lightweight of the Metal 3D Printing Based Hybrid Machining Center Won-Young Jeong, Ho-In Jeong, Choon-Man Lee Journal of the Korean Society of Manufacturing Process Engineers.2021; 20(2): 80. CrossRef
Shape Optimization for Lightweight of the Line Center for Processing Complex Shape Parts Do-Hyun Park, Ho-In Jeong, Sang-Won Kim, Choon-Man Lee Journal of the Korean Society of Manufacturing Process Engineers.2021; 20(8): 86. CrossRef
Structural Safety of the Incinerator Transfer Conveyor Roller Chain Using GBO Bo-Ram Lee, Gyeong-Seop Park, Ill-Soo Kim Journal of the Korean Society of Manufacturing Technology Engineers.2020; 29(1): 9. CrossRef
Recently, demands for difficult-to-cut materials with high mechanical properties have been increased in various industrial fields, such as the aerospace and automobile industries. Because difficult-to-cut materials have high mechanical properties, it is difficult to achieve conventional machining. Therefore, many researchers have been studying the machining methods for difficult-to-cut materials. One of the many studies of how to cut difficult-to-cut materials involves plasma-assisted machining (PAM) is a machining method that softens difficult-to-cut materials by a plasma heat source to remove by the cutting tool. PAM has various machining conditions, and it is very important to determine the optimal conditions to improve machining accuracy and efficiency. In this study, the cutting force was analyzed by using a gas flow rate and power which are the easiest to control in the PAM system. The results of this study can be applied to PAM data under optimum conditions.
Citations
Citations to this article as recorded by
A Study on Optimal Machining Conditions and Energy Efficiency in Plasma Assisted Machining of Ti-6Al-4V Young-Hun Lee, Choon-Man Lee Materials.2019; 12(16): 2590. CrossRef
This paper is a study of the machining characteristics, cutting force and surface roughness of a turning center by laserassisted machining. The laser-assisted machining (LAM) is an effective method to improve the machinability of difficult-tocut materials. The LAM has recently been studied for various machining processes, but the research on the threedimensional and turning-center machining is still insufficient. In this study, a machining experiment of the turning-center process was performed by the laser-assisted machining with Inconel 718. Before the machining experiment, performed to thermal analysis was for a selected to effective depth of cut. The cutting force and surface roughness were compared and analyzed. The machining experiment confirmed that the machinability was improved in the LAM.
Citations
Citations to this article as recorded by
An Analytical Study on the Thermal-Structure Stability Evaluation of Mill-Turn Spindle with Curvic Coupling Choon-Man Lee, Ho-In Jeong Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(1): 100. CrossRef
As emission regulation of vehicles is being reinforced globally, the current requirement of the automobile industry are innovative green technologies that reduce the weight of the vehicle, thereby improving fuel consumption and the amount of exhaust gas emission. The application of ultra-high strength steel (UHSS) for vehicles has specifically been studied for light weight of vehicles. UHSS withstands greater loads than a general steel sheet of the same thickness. The spring-back and formability of the UHSS are also worse than general steel sheet due to their high elasticity and high yield strength. Various methods applied for processing UHSS include roll-forming and hot-press forming. However, these processes have not only high installation cost but also low productivity. This study therefore developed the cold-press forming method to overcome these disadvantages. The objective of this study is to determine the optimum conditions of the cold press required to form the upper seat track using UHSS. Forming analysis predicted the spring-back at each stage of the press forming. The prediction of spring-back was compared with the manufactured upper seat track by try-out, thereby reducing trial and error in the pressing process.
Citations
Citations to this article as recorded by
Press Forming/Drawing Molding in the Radiator Support Mold Process of 440 MPa High Strength Steel Sheets Dong-Hwan Park, Tae-Gil Lee, Hyuk-Hong Kwon Journal of the Korean Society for Precision Engineering.2024; 41(1): 71. CrossRef
Hot Stamping Parts Shear Mold Manufacturing via Metal Additive Manufacturing Myoung-Pyo Hong Applied Sciences.2022; 12(3): 1158. CrossRef
Impact Energy Absorption Capability Analysis of Locally Softened High-Strength Steel Bumper Beams Using Induction Heat Treatment Jongsu Kang, Myunghwan Song, Hyeongjun Jeon, Jae-Yong Lim Transaction of the Korean Society of Automotive Engineers.2019; 27(1): 39. CrossRef
Process Design of Automobile Seat Rail Lower Parts using Ultra-High Strength, DP980 Steel Dong-Hwan Park, Yun-Hak Tak, Hyuk-Hong Kwon Journal of the Korean Society of Manufacturing Process Engineers.2018; 17(2): 160. CrossRef
The recent crisis of environmental pollution and resource depletion has become a major global issue, resulting in an increasing interest in remanufacturing in many countries. However, manufacturing for environmental protection is considered an additional cost factor by most companies. Therefore, governments worldwide have actively implemented remanufacturing policies to encourage the participation of numerous companies in the remanufacturing industry. As an eco-friendly technology, remanufacturing has impacted the environmental improvement and resource savings by reducing raw materials and production processes. In particular, the effect of machine tool and automobile part remanufacturing is very remarkable, since most parts are reusable. In this study, the standardization technology for remanufacturing process of machine tools is developed by remanufacturing of used vertical machining center. Based on the work operation sheet for establishing the process, the remanufacturing process chart and program were developed. The performance evaluation of machining centers before and after remanufacturing was also executed, to check the performance improvement of the remanufactured product. The performance evaluation criteria were established to improve reliability.
Citations
Citations to this article as recorded by
The promotion and application of green remanufacturing: a case study in a machine tool plant Boxue Song, Xingyu Jiang, Song Wang, Qing Liu, Tianbiao Yu Environmental Science and Pollution Research.2023; 30(14): 40870. CrossRef
A Study on the Remanufacturing of the Shaft in Large Size Planner Miller Using Structure Analysis Il-Hwan Park, Kwang-Kyu Lee, Dong-Gyu Ahn, Tae-Woo Kim, Sang-Seok Seol, Dae-Sun Hong Journal of the Korean Society of Manufacturing Process Engineers.2022; 21(10): 53. CrossRef
Remanufacturing Technology Development of Industrial Hydraulic Cylinder Kyu-Chang Lee, Woo-Hyun Son, Sang-Jin Park, Hak-Soo Mok Journal of the Korean Society of Manufacturing Technology Engineers.2018; 27(6): 539. CrossRef
Bearings having a small clearance during normal operation are selected. In some cases, bearings having a negative clearance when mounted are selected, to generate internal stress which enables achieving various effects. This so-called preload can be applied only to rolling bearings and not sliding ones. The performance of bearings is greatly affected by the applied preload. Application of a heavy preload to enhance the stiffness at the spindle undermines the high-speed rotation performance. In contrast, when a light preload is applied for high speed rotation, the stiffness is undermined. Therefore, a variable preload method is required. This study aims to develop a variable preload device using a linear actuator of the ball screw type, and to perform the performance evaluation of the developed device. Our studies verified that the proposed device worked satisfactorily.
Citations
Citations to this article as recorded by
An Analytical Study on the Thermal-Structure Stability Evaluation of Mill-Turn Spindle with Curvic Coupling Choon-Man Lee, Ho-In Jeong Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(1): 100. CrossRef
The latest preload technology of machine tool spindles: A review Choon-Man Lee, Wan-Sik Woo, Dong-Hyeon Kim International Journal of Precision Engineering and Manufacturing.2017; 18(11): 1669. CrossRef
Recently, traffic accidents and damage on the highway have increased because of overloaded vehicles. The existing overload-detecting system has a low accuracy rate. An overload-detecting system using a weigh-in-motion (WIM) system has been developed to solve this problem. The WIM system can be used to detect overloaded vehicles by measuring the weight of the vehicles. The WIM system is divided into high-speed and low-speed types. The inaccuracy rate in the lowspeed WIM system results mainly from the low response rate of the sensor when the velocity is moving at more than 20 ㎞/h. In this study, a low-speed overload-detecting pad with a hydraulic structure using a WIM system was developed to make the system more accurate. The structural and formal analysis was carried out by using a finite element method (FEM) in order to analyze the structural stability and the extrusion velocity of the system. In addition, a static load test was performed to confirm the linearity and accuracy of the pad.
Recently, a high-precision ball screw is an essential part of high-speed machines. However, producing high-precision ball screws has been costly and time-consuming. Nowadays, a whirling machine is used to produce high-precision ball screws efficiently. Rotating multi-tips are used to turn the ball screw in the whirling machine. In this study, a structural analysis was performed by a finite-element method to develop a whirling machine. An improved model of the whirling machine was proposed by the analysis. In addition, a thermal analysis was performed to confirm the thermal stability. The results of the analysis can be applied in order to further develop the whirling machine.
Citations
Citations to this article as recorded by
Heat Generation Characteristics of Whirling Spindle for Ball Screw Machining Hong-Man Moon, Sang-Won Kim, Ho-In Jeong, Choon-Man Lee Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(10): 44. CrossRef
Recently, the problem of the accumulation of fine sludge from the cutting oil generated during machining processes has become a major threat to the environment. The fine sludge has adverse affects on the human body and the environment, and significantly contributes to marine pollution. However, a microfiltration technique that can process the sludge still needs to be studied and developed on a global scale. Therefore, it is necessary to develop eco-friendly equipment such as an ECO vacuum filter system and eco-friendly technologies for processing cutting oil. In this study, a structural analysis was carried out using a finite element method (FEM). Improved models of the suction chamber for the ECO vacuum filter system were proposed based on the analysis of the displacement and stress of the system. The model with the best result was then optimized using the commercial software, ANSYS. It was confirmed that, in the optimized model, displacement and stress were reduced in comparison with the initial model. Finally, the structural stability of the optimized model was verified through analysis.
First
Prev
