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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 30, Issue 12 - Dec 2013
Volume 30, Issue 11 - Nov 2013
Volume 30, Issue 10 - Oct 2013
Volume 30, Issue 9 - Sep 2013
Volume 30, Issue 8 - Aug 2013
Volume 30, Issue 7 - Jul 2013
Volume 30, Issue 6 - Jun 2013
Volume 30, Issue 5 - May 2013
Volume 30, Issue 4 - Apr 2013
Volume 30, Issue 3 - Mar 2013
Volume 30, Issue 2 - Feb 2013
Volume 30, Issue 1 - Jan 2013
Selecting the target year
A Study on Effect of Various Cooling Methods in Motion of High-Precision Ball Screw
Kim, Su-Sang ; Xu, Zhe-Zhu ; Kim, Hyun-Koo ; Lyu, Sung-Ki ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 254~259
DOI : 10.7736/KSPE.2013.30.3.254
Ball screw system is widely used as a precision mechanical linear actuator that translates rotational motion to linear motion for its high efficiency, great stiffness and long life. Recently, according to the requirements of high accuracy and stiffness, the pre-load on the ball screw which means of remove the backlash in the ball screw is usually used. Because of the preload which means the frictional resistance between the screw and nut, becomes a dominating heat source and it generates thermal deformation of ball screw which is the reason for low accuracy of the positioning decision. There are several methods to solve the problem that includes temperature control, thermal stable design and error compensation. In the past years, researchers focused on the error compensation technique for its ability to correct ball screw error effectively rather than the capabilities of careful machine design and manufacturing. Significant amounts of researches have been done to real-time error compensation. But in this paper, we developed a series of cooling methods to get thermal equilibrium in the ball screw system. So we find the optimum cooling type for improving positioning error which caused by thermal deformation in the ball screw system.
A Fundamental Study on the Development of a Variable Preload Device Using Toggle Joint Mechanism
Choi, Chi Hyuk ; Cha, Na Hyeon ; Lee, Choon Man ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 260~265
DOI : 10.7736/KSPE.2013.30.3.260
To increase the machine accuracy by improving the stiffness of spindle bearings, preload was applied to the spindle bearings. The methods of fixed position preload, convertible preload, constant pressure preload, and variable preload are used to apply the preload to the spindle bearing. The previous studies performed by the author of this study were variable preload methods using rubber pressure and centrifugal force based on mechanical systems. This study proposed a toggle joint mechanism that could be applied to variable preload method using centrifugal force and rubber pressure to increase the preload. Also, a finite element analysis was conducted to predict the deformation of the rubber and change of the preload. And the analysis results showed that the preload by the device using rubber pressure only was increased by the toggle joint mechanism using rubber pressure.
The Technical Trend and Future Development Direction of Machine Tools Automatic Tool Changer by Patent Mapping
Kim, Dong Hyeon ; Chee, Hyun Su ; Lee, Choon Man ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 266~270
DOI : 10.7736/KSPE.2013.30.3.266
Automatic tool changer(ATC) is typically provided to a machine tool to improve the efficiency of the machine tool significantly by saving time in moving, switching, installing and storing tools as well as adjusting a calibrating the machine tool. In this study, technical trend of machine tools automatic tool changer are analyzed by patent mapping. And future development direction of automatic tool changer has suggested. The analysis is carried out by using problem solution map for the applied patent during 2000 and 2010 in USA, Japan, Europe and Korea.
Effect of Aging Heat Treatment on the Mechanical Properties in Inconel 718 Alloy
Kang, Hee Jae ; Kim, Jung Min ; Jee, Sung Hwan ; Sung, Jie Hyun ; Kim, Young Hee ; Sung, Jang Hyun ; Jeon, Eon Chan ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 271~277
DOI : 10.7736/KSPE.2013.30.3.271
Inconel 718 super alloy was aging heat treated at the temperature range from
for 5~40 hours after solution annealing at
for 1 hour. The aging treated specimens were investigated microstructure, mechanical properties and thermal expansion/contraction. Precipitates appeared for a long time aging treatment were niobium carbide and also
phase. For the aging treatment time of 10 hours, the changes in strength and hardness with increasing aging treatment temperature showed the maximum value at the temperature of
. This maximum value is to be related with the precipitation of
phases. The decrease in strength, elongation and hardness during long time aging at
were thought to be induced from the coarsening of the grain size and the transformation of
phase. For the specimens treated for 10 hours, impact energy showed constant value of ~105 J with increasing the aging temperature, however this value continuously decreased with elapsing time at the aging temperature of
. It was found that the decrease in impact value was induced from the coarsening of grain size and the carbide coarsening. The coefficient of thermal expansion of aging treated Inconel 718 alloy increased with raising test temperature, and the coefficient was appeared
, respectively, after heating to
A Study on the Design of Compression Air Hole in Front of Spindle for Chip Removal
Kang, Dong Wi ; Lee, Choon Man ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 278~283
DOI : 10.7736/KSPE.2013.30.3.278
While Built-in Spindle is working in machining center, the tool is changed by ATC(Automatic Tool Changer) automatically. However, impurities could be stacked in front of spindle because of chips formation while machining, and positional error between spindle and tool could be generated. Compressed air holes are necessary for removal of the impurities. But, the diameter and number of compressed air hole are different for each built-in spindle in market. In this paper, flow analysis is carried out to find out the efficient figuration of the compressed air hole by using velocity and pressure distributions.
Micro Machining of Titanium Alloy Using Polycrystalline Diamond Tools
Moon, In Yong ; Kim, Bo Hyun ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 284~291
DOI : 10.7736/KSPE.2013.30.3.284
Micro cutting of titanium alloy by polycrystalline diamond (PCD) tools was studied. Micro electro discharge machining (MEDM) was used to fabricate customized micro shaping tools from PCD blank. The tool was used to machine micro grooves on Ti alloy and the effects of depth of cut and machining length on tool wear, burr and surface roughness were studied. The shaping tool has cutting edge of a few
. The crater size of the tool surface was increased with increasing capacitance of EDM machining conditions, which was used to control the surface roughness of the machined micro grooves.
Development of a Measurement System for Curved Ship Hull Plates with Multi-Slit Structured Light
Lee, Hyunho ; Lee, Don Jin ; Huh, Man Joo ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 292~299
DOI : 10.7736/KSPE.2013.30.3.292
The measurement in the manufacturing process of curved ship hull plates still depends on wooden templates as a standard instrument. The metrology-enabled automation in the shipbuilding process has been challenged instead of line measurement with wooden templates. The developed measurement system consists of a CCD camera, multiple structured laser sources and 3-DOF motion device. The system carries out measurement of curved profiles for large scale plates by an optical triangulation method. The results of experiment conducted in a manufacturing shop demonstrate the accurate and robust performance.
Development of Cylindrical-object Grasping Force Measuring System with Haptic Technology for Stroke's Fingers
Kim, Hyeon Min ; Kim, Gab Soon ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 300~307
DOI : 10.7736/KSPE.2013.30.3.300
This paper describes the development of a cylindrical-object grasping force measuring system applied haptic technology to measure the grasping force of strokes patients' fingers and other patients' paralyzed fingers. Because the cylindrical-object and the force measuring device of the developed cylindrical-object grasping force measuring system are connected with the electrical wires, patients and their families have difficulty not only measuring the patients' grasping force using the system but also knowing their rehabilitation extent when using it. In this paper, the cylindrical-object grasping force measuring system applied haptic technology was developed, and the cylindrical-object grasping force measuring device sends data to the rehabilitation evaluating system applied haptic technology by wireless communication. The grasping force measurement characteristic test using the system was carried out, and it was confirmed that the rehabilitation extent of the patients' paralyzed fingers and normal people fingers can be evaluated.
Development of Grid Observation Model for Particle Filter-based Mobile Robot Localization using Sonar Grid Map
Park, Byungjae ; Lee, Se-Jin ; Chung, Wan Kyun ; Cho, Dong-Woo ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 308~316
DOI : 10.7736/KSPE.2013.30.3.308
This paper proposes an observation model for a particle filter-based localization using a sonar grid map. The proposed model estimates a predicted observation by considering the properties of a sonar sensor which has a large angular uncertainty. The proposed model searches a grid which has the highest probability to reflect a sonar beam using the following procedures; (1) the reliable area of a single sonar data is determined using the footprint association model; (2) the detection probability of each grid cell in a sonar beam coverage in estimated. The proposed model was applied to the particle filter based localization, and was verified by experiments in indoor environments.
A Study on Mixing Characteristics of Two-component Polyurethane for In-mold Coating
Lee, Ho Sang ; Kim, Dong Mi ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 317~323
DOI : 10.7736/KSPE.2013.30.3.317
In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.
An Optical Surfacing Technique of the Best-fitted Spherical Surface of the Large Optics Mirror with Ultra Precision Polishing Machine
Song, Chang Kyu ; Khim, Gyungho ; Hwang, Jooho ; Kim, Byung Sub ; Park, Chun Hong ; Lee, Hocheol ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 324~330
DOI : 10.7736/KSPE.2013.30.3.324
This paper describes a novel method to surface large optics mirror with an extremely high hardness, which could replace the high cost of the repetitive off-line measurement steps and the large ultra-precision grinding machine with ultra-positioning control of 10 nm resolution. A lot of diamond pellet to be attached on the convex aluminum base consists of a grinding tool for the concave large mirror, and the tool was pressured down on the large mirror blank. The tool motion at an interval on the spiral path was controlled with each feed rate as the dwell time in the conventional computer-controlled polishing. The shape to be surfaced was measured directly by a touch probe on the machine without any separation of the mirror blank. Total 40 iterative steps of the surfacing and measurement could demonstrate the form error of RMS
, surface roughness of Ra
for the mirror blank with diameter of 1 m and spherical radius of curvature of 5400 mm.
The Assessment on Electromyography of Trunk Muscle according to Passive and Active Trunk Tilt Exercise of 3-D Dynamic Postural Balance Training System
Shin, Sun Hye ; Yu, Mi ; Jeong, Gu Young ; Yu, Chang Ho ; Kim, Kyung ; Jeong, Ho Choon ; Kwon, Tae Kyu ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 331~339
DOI : 10.7736/KSPE.2013.30.3.331
The Interest in disease prevention and rehabilitation is increasing depending on increase of patients with spinal. This is being developed using the spine stabilization device is being studied. So far studies have only evaluated the effect on trunk stabilization exercises but analysis of human movement patterns for active movement and passive movement did not. We assessed the muscle activity of trunk and leg muscle during passive and active tilt mode on eight tilt directions at tilt angle of
using 3-D dynamic postural balance training system. We performed experimental study on the muscular activities of trunk muscle about rectus abdominis, external obliques, latissimus dorsi, erector spinae, and leg muscle about rectus femoris, Biceps femoris, Tibialis Anterior, gastrocnemius. As a result, muscle activation was different depending on the direction of movement and pattern. The results indicate that various patterns of spinal stabilization exercise system could be applied to an effective training of chronic low back pain patients.
Development of Projection Scanbeam-SLA using Liquid Crystal Display and Visible Light Emitting Diode
Yoon, Su Hyun ; Park, In Baek ; Kim, Min Sub ; Jo, Kwang Ho ; Lee, Seok Hee ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 340~348
DOI : 10.7736/KSPE.2013.30.3.340
In Projection Stereolithography Apparatus (PSLA), Digital Micromirror Device (DMD) and Liquid Crystal Display (LCD) are used as a beam pattern generator. The DMD shows high resolution, but it is mostly applied in micro stereolithography due to high cost and fabricable area. In LCD, the size of pattern beam is freely controlled due to various panel sizes. The LCD, however, has some limitations such as short life time by the high power light source, non-uniform light intensity of pattern beam and low transmittance of UV-light. To solve these problems in LCD-based PSLA, a Scanbeam-SLA with LCD of 19 inches and visible LED-array is developed. In this system, the light module works like a scanner for uniform illumination. The system configuration, working principle and fabrication examples are addressed in this study.
A Study on Manufacturing Processes of Street-lighting System using COH LED Package
Lee, Jong Hang ; Yang, Keun Ju ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 3, 2013, Pages 349~355
DOI : 10.7736/KSPE.2013.30.3.349
Recent high oil price results in the development of energy saving technology such as LED lighting system. Street-lighting system using COH LED package can save energy because the heat dissipation through cupper base is better than conventional technology. Studies on manufacturing processes of lighting system are insufficient even though LED package design and its heat analysis have been studied. This study focuses on the problem and solution of manufacturing processes such as LED packaging process, optimized emission angle, and LED bar dimension for mechanical assembly. As a result, we established better manufacturing alternatives of LED packaging and street-lighting system with higher lighting efficiency of 84 lm/W, as well as good illumination intensity of 39.7 lux at 6 m from lighting source.