권호 표지

Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers

  • Monthly
  • /
  • 1598-6721(pISSN)
  • /
  • 2288-0771(eISSN)

Domain

  • Machinery ＞ Precision Machines

Aim & Scope

Journal of the Korean Society of Manufacturing Process Engineers (KSMPE)aims to contribute in the development of science and technology of manufacturing and production system based on production engineering, further contributing to the country's industrial development. The scope of the Journal includes the areas of machining, special machining, precision machining, ultraprecision machining, machine tools, plasticity, mold machining, injection molding, production automation, welding, control mechatronics, design and CAE, tribology, and other subjects pertaining in manufacturing technology. 한국기계가공학회지의 투고분야는 절삭가공, 특수가공, 정밀가공, 초정밀가공, 공작기계, 소성가공, 금형가공, 사출성형, 생산자동화, 용접, 제어메카트로닉스, 설계 및 CAE, 트라이볼러지, 생산제조기술의 범주에 포함되는 기타 분야이다.

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Volume 17 Issue 2

  1. Yu, Eun-seop;Kim, Seok-Chan;Lee, Hanmin;Mun, Duhwan 1
    https://doi.org/10.14775/ksmpe.2018.17.2.001 PDF KSCI
    Recently, as interest in the internet of things has increased, a vibration energy harvester has attracted attention as a power supply method for a wireless sensor. The vibration energy harvester can be divided into piezoelectric types, electromagnetic type and electrostatic type, according to the energy conversion type. The electromagnetic vibration energy harvester has advantages, in terms of output density and design flexibility, compared to other methods. The efficiency of an electromagnetic vibration energy harvester is determined by the shape, size, and spacing of coils and magnets. Generating all the experimental cases is expensive, in terms of time and money. This study proposes a method to perform design optimization of an electromagnetic vibration energy harvester using an open source, big data platform.
  2. Jung, Seung Wan;Park, Sang Hoon;Song, Myung Jun;Lee, Yeol 8
    https://doi.org/10.14775/ksmpe.2018.17.2.008 PDF KSCI
    In the present work, a numerical study is carried out to observe the characteristics of the flow and particle behaviors in a supersonic double Venturi abrasive blasting nozzle. Schlieren flow visualization and Pitot pressure at the nozzle downstream are also carried out, and those measurement results are compared to the numerical ones for code validation. Open and closed secondary holes on the double Venturi nozzle surface are tested for various nozzle pressures, and the results are compared with the ones observed for other similar supersonic Laval nozzles.
  3. Kim, Jeong-Jae;Mun, Tae-Eun;Park, Hun-Min;Kim, Jeong-Min 15
    https://doi.org/10.14775/ksmpe.2018.17.2.015 PDF KSCI
    In this paper, a detection and warning system is proposed for the remaining kids in a school bus. For detecting the remaining kids, an ultrasonic sensor is used. The basic experiments of the ultrasonic sensor are performed, and a modified ultrasonic sensor is proposed. Also, the appropriate location of the ultrasonic sensor is proposed by considering various sitting positions. Based on the above kid detection system, a warning algorithm is designed. Using the above detection and warning system, experiments are performed. From the experimental results, it is found that the proposed system, based on the modified ultrasonic sensor, can detect the remaining kids in a school bus. The proposed system can also give an appropriate warning signal.
  4. Do, Seung-Ju;Yang, Young-Joon 22
    https://doi.org/10.14775/ksmpe.2018.17.2.022 PDF KSCI
    The purpose of this study was to evaluate the performance of a solar collector to introduce natural convection in a water tank as a means of obtaining warm water. Numerical analysis was performed to predict the characteristics of the solar collector and its performance was verified using an experimental method. The single vacuum structure of the collector enabled natural convection when it was fitted on the water tank. Based on numerical analysis, warm water of $31-54^{\circ}C$ was obtained when the inlet temperature of cold water was $20^{\circ}C$. Furthermore, the temperature of the warm water could be predicted under various conditions as well as the experimental conditions created for this study.
  5. Lee, Boo-Youn 30
    https://doi.org/10.14775/ksmpe.2018.17.2.030 PDF KSCI
    Since the freezer compartment and the refrigerating compartment are located side by side in a side-by-side refrigerator, the problems of the door height difference (DHD) and door flatness difference (DFD) have been constantly raised. Deformation of the cabinet of a built-in side-by-side refrigerator under food and thermal loads was analyzed by the finite element software ANSYS. The DHD and DFD, occurring due to the deformation of the cabinet, evaluated. From the results of the analysis of the cabinet, the 3D CAD software CATIA was used to geometrically translate and rotate the freezing and refrigerating compartment doors, in consideration of the displacement of the hinge fastening point. Then, the coordinates of two points on the upper corner of the doors were determined, and the DHD and DFD were obtained. It found that the thermal load, occurring under normal operation conditions, decreases the door height difference, but increases the door flatness difference. Values of the analyzed DHD and DFD appear smaller than the acceptance criteria used by the refrigerator manufacturer.
  6. Lee, Boo-Youn 37
    https://doi.org/10.14775/ksmpe.2018.17.2.037 PDF KSCI
    Present research is to evaluate and improve the sealing performance of the duct cap assembly for the ice dispensers through structural analysis. The nonlinear contact problems to check the sealing performance were analyzed using ANSYS software. The results of the analyses related to the sealing performance: the displacement distribution, the contact condition between the cap-silicon and the case, and the pressure distribution on the contact surface, were examined and discussed. Based on the results of the existing design of the duct cap assembly, two cases of the design modifications to improve the sealing performance were introduced. By examining the results of the two cases, a final design improvement plan was proposed and analyzed. It is shown that the sealing performance of the proposed final design is much more favorable than the existing design. The method of structural analysis and design improvement of the duct cap assembly presented in this paper will help improve the sealing performance of the ice dispenser duct caps.
  7. Shin, Dong-Hun;Park, Young-Min;Park, Sang-Hu 47
    https://doi.org/10.14775/ksmpe.2018.17.2.047 PDF KSCI
    Nowadays, additive manufacturing (AM) technology is a promising process to fabricate complex shaped devices applied in medical and dental services. Among the AM processes, a DLP (digital light processing) type 3D printing process has some advantages, such as high precision, relatively low cost, etc. In this work, we propose a simple method to fabricate precise dental models using a DLP 3D printer. After 3D printing, a part is commonly post-cured using secondary UV-curing equipment for complete polymerization. However, some shrinkage occurs during the post-curing process, so we adaptively control the UV-exposure time on each layer for over- or under-curing to change the local shape-size of a part in the DLP process. From the results, the shrinkage amounts in the post-curing process vary due to the UV-dose in 3D printing. We believe that the proposed method can be utilized to fabricate dental models precisely, even with a change of the 3D CAD model.
  8. Han, Moonsik;Cho, Jaeung 54
    https://doi.org/10.14775/ksmpe.2018.17.2.054 PDF KSCI
    In this study, the durability due to the fork shape of excavator bucket is investigated. The analysis is carried out by modelling the fork shape used in general. As the analysis condition, the pin is constrained as fixed support at the bucket and the load of 12000N is applied at the fork. As the study result, the maximum equivalent stresses at models 1 and 2 are shown as 56.895MPa and 54.722MPa respectively. Model 1 is shown to have the most deformation of 5.6686 mm among four models. Model 3 has the least deformation among four models and the maximum deformation of model 3 is shown as 4.948mm. The fatigue analyses are also carried out with three models. Each model shows the same fatigue lives under the identical fatigue loads. The damage part at each model is shown at the bucket pork or the pin connected with bucket. As this study result, the data is thought to contribute to the safety design at excavator bucket.
  9. Sa, Min-Woo;Lee, Chang-Hee;Choi, Seung-Hyeok;Kim, Chan Won;Cho, Hyun Gil;Kim, Jong Young 60
    https://doi.org/10.14775/ksmpe.2018.17.2.060 PDF KSCI
    Recently, environment-friendly cultivation technology is popular. A cultivator is useful for turning over the stall bedding in a poultry farm. In this study, a rotary-based cultivator with a rechargeable battery was developed for eco-friendly management of broiler chickens. From the results of the test run, the clustered stall bedding was approximately divided into up and down layers. Through experimental evaluation, the working width was more than 60 cm, and the noise was less than 80 dB. The output of the motor was 400 W, and the speed of rotation was 3000 rpm. Electric battery type cultivators are expected to be widely used in the livestock industry.
  10. Choi, Hoon-Ki;Yoo, Geun-Jong;Lim, Yun-Seung 68
    https://doi.org/10.14775/ksmpe.2018.17.2.068 PDF KSCI
    A vortex tube is a simple energy separating device that splits a compressed air stream into a cold and hot stream without any external energy supply or chemical reactions. The efforts of many researchers and designers have been focused on improvement of vortex tube efficiency by changing the parameters affecting vortex tube operation. The effective parameters are nozzle specifications and inflow pressure conditions. Effects of different nozzle cross-sectional area and number of nozzles are evaluated by computational fluid dynamics (CFD) analysis. In this study, CFD analysis of 3-D steady state and turbulent flow through a vortex tube was performed. We investigated the cold air mass flow rate, the cold air temperature, and the cold air heat transfer rate behavior of a vortex tube by utilizing seven straight nozzles and four inflow pressure conditions.
  11. Shin, Cheolho;Oh, Yeong Min;Park, Ji Soo 77
    https://doi.org/10.14775/ksmpe.2018.17.2.077 PDF KSCI
    Track shoes improve the off-road driving ability of tanks. The strength of the track shoe body directly affects the driving ability of tanks, self-propelled artillery, and armored vehicles. In this study, the design technique for track shoe body was investigated. To select the optimal design of track shoe body, three track shoe body models were suggested and compared. Tensile strength was calculated using computer-aided engineering (CAE) analysis. Compressive tests were conducted using the original tank sprocket because sprocket compression is critical to the lifespan of the track shoe body. As a result, one track shoe body design was selected and the process of track shoe body design was described.
  12. Yoon, Jong-Cheon;Lee, Min-Gyu;Choi, Chang-Young;Kim, Dong-Hyuk;Jeong, Myeong-Sik;Choi, Yong-Jin;Kim, Da-Hye 83
    https://doi.org/10.14775/ksmpe.2018.17.2.083 PDF KSCI
    Additive manufacturing (AM) technologies have attracted wide attention as key technologies for the next industrial revolution. Among AM technologies using various materials, powder bed fusion (PBF) processes and direct energy deposition (DED) are representative of the metal 3-D printing process. Both of these processes have a common feature that the laser is used as a heat source to fabricate the 3-D shape through melting of the metal powder and solidification. However, the material properties of the deposited metals differ when produced by different process conditions and methods. 17-4 precipitation-hardening stainless steel (17-4PH SS) is widely used in the field of aircraft, chemical, and nuclear industries because of its good mechanical properties and excellent corrosion resistance. In this study, we investigated the differences in microstructure and mechanical properties of deposited 17-4PH SS by PBF and DED processes, including the heat treatment effect.
  13. Choi, Chang-Young;Mo, Nam-Gyu;Kim, Gun-ho;Yoon, Jong-Cheon;Jung, Yu-Hyun;Kim, Dong-Hyuk;Choi, Yong-Jin;Lee, In-Kyu;Cho, Yong-Jae 89
    https://doi.org/10.14775/ksmpe.2018.17.2.089 PDF KSCI
    Due to industrial advancement and environmental concerns, there is a demand for light-weight material parts with high-performance characteristics. In order to meet this demand, various studies have been conducted on developing high-performance castings to achieve composite features by coating only specific parts that require high performance, with dissimilar joining, rather than coating the entire material part. This study analyzed the possibility of forming a local composite layer on an aluminum alloy through evaporation pattern casting, and the effects of parameters on the aluminum alloy.
  14. Sim, Ki-Joong;Moon, Hong-Ju;Lee, Youngchoon 95
    https://doi.org/10.14775/ksmpe.2018.17.2.095 PDF KSCI
    This paper presents the development of the transfer case for a 3.5-ton commercial vehicle. A transfer case is composed of many parts, including helical gear, shaft, bearing, planetary gear, and others. Helical gears are currently used as power transmitting gears due to their relatively smooth and silent operation, large load carrying capacity, and operation at higher speeds. The key parameter in transfer case development is the bending stress at the root of a tooth in the helical gear. The bending stress of the helical gear has been studied through theoretical calculation and finite element method (FEM) analysis. Major factors of the bending stress calculation are determined according to American Gear Manufacturers Association (AGMA) standards, and FEM model analysis of the helical gear is conducted. FEM results are compared with theoretical calculations and the difference of the bending stress is described.
  15. Bae, Myung-Il 103
    https://doi.org/10.14775/ksmpe.2018.17.2.103 PDF KSCI
    In interrupted cutting, the workpiece has a groove that impacts both the cutting tool and the workpiece. Therefore, cutting tool damage occurs rapidly. In this study, I performed interrupted cutting of carbon steel for machine structures (SM20C) using an uncoated carbide tool (SNMG120404, P20), and observed tool damage, cutting chip shape, and the workpiece surface. Results: Under the specific cutting conditions of feed rate = 0.066 mm/rev, cutting speed = 120 m/min, and depth of cut = 0.1 mm; and feed rate = 0.105 mm/rev, cutting speed = 120 m/min, and depth of cut = 0.2 mm, the observed tool damage was small. Similar chip shape was observed (Expt. No. 1, 3, 7). Workpiece damage was observed (Expt. No. 3, 5, 7, 9).
  16. Lee, Cheonghwa;Chu, Baeksuk 109
    https://doi.org/10.14775/ksmpe.2018.17.2.109 PDF KSCI
    The experimental results are presented of an autonomous flight algorithm of a foldable quadcopter with airdrop launching functions. A foldable wing structure enabled the quadcopter to be inserted into a rocket container with limited space. The foldable quadcopter was then separated from the rocket in the air. The flight pattern was tracked using a global positioning system (GPS) with various sensors, including an inertial measurement unit (IMU) module until a designated target position was reached. Extensive field tests were conducted through an international rocket competition, ARLISS 2017, which was held in Black Rock Desert, Nevada, USA. The flight trajectory record of the experiments is stored in electrically erasable programmable read-only memory (EEPROM) embedded in the main control unit. The flight record confirmed that the quadcopter successfully separated from the rocket, executed flight toward the target for a certain length of time, and stably landed on the ground.
  17. Park, Chang Hyung;Kim, Jin Ho 118
    https://doi.org/10.14775/ksmpe.2018.17.2.118 PDF KSCI
    Coil guns are known worldwide as inexpensive space launch vehicles. The principle of Fleming's right-hand rule allows the coil gun to accelerate the projectile by applying enormous voltage to the solenoid coil. This study was performed to improve the speed of the coil gun using MATLAB, a commercially available numerical program for high launching force of electromagnetic projectiles. To maximize the speed of the projectile, the largest coil of American wire gauge was used, and the number of windings in the radial and axial directions of the solenoid coil was optimized. Optimal length of the projectile was obtained by calculating the optimal aspect ratio between the axial length of the solenoid coil and the length of the projectile.
  18. Han, Moonsik;Cho, Jaeung 124
    https://doi.org/10.14775/ksmpe.2018.17.2.124 PDF KSCI
    A forklift is used to lift materials above a height of 2 m. The width of the fork determines the weight of the material it can carry. In this paper, three models of fractured forklifts were analyzed to determine if the fracture was caused by load fatigue due to the width of the fork. The position of the fork was fixed on each model, and a 2.5 ton load was placed at the upper part of the fork. The width distances on each of three models were 500 mm, 750 mm and 1000 mm, and the maximum equivalent stresses were 237.5MPa, 227.62MPa and 230.99MPa, respectively. This analysis demonstrated that as the load increased with use of the wider fork, the fatigue life remained to be nearly equivalent irrespective of fork width among all three models. The results of this study contribute to the durability and safety design of forklifts.
  19. Cho, Kyu-Chun;Ha, Man-Ho;Moon, Hong-ju;Kim, Young-Gon 130
    https://doi.org/10.14775/ksmpe.2018.17.2.130 PDF KSCI
    This study develops a seat with electric motor technology for a one-ton grade commercial vehicle. While applying electric motor technology, the FMVSS 210 seat frame strength test is also conducted to examine the product's weak parts. The seat frame strength test used the FMVSS 210 test standard and the ANSYS program was used to simulate the test and identify weak parts in the deformation and strain values. The test results showed that the cushion frame and slide rail connection bracket were fractured at loads of about 10,000 N. Similarly, the maximum stress and strain values in the bracket were obtained in the simulation results. On this basis, it was evaluated that the connection part bracket was a considerably weak part in the case of the first model, and changing the shape of the bracket and reinforcing the strength were required. In addition, the seat belt anchorage test results and simulation results were compared to assure their validity. In the comparison results, the error for each is about 5-10%. Therefore, the simulation performed in this study is considered to have produced reasonably accurate results.
  20. Kang, Dongmyeong;Cho, Kyuchun;Hwang, Taekju;Sim, Kijoong;Guk, Ho-Hyeong;Kim, in-Soo;Park, Moon-ho 137
    https://doi.org/10.14775/ksmpe.2018.17.2.137 PDF KSCI
    This study describes the 3D design and analysis of a composite insulation boom of an aerial work platform for electric work. Structural analysis of the composite insulation boom was performed using ANSYS and the total deformation, equivalent stress, and normal elasticity were investigated at 150 mm, 500 mm, 1,000 mm, and 1,500 mm using a mounted strain gauge. The results of the analysis and test were similar in a linearly increasing slope and the difference in the strain value was about 10%. This difference depends on the compressive force in the manufacturing process.
  21. Kim, Sang Won;Jung, Chang Jo;Lee, Jung-Hwan;Kang, Dong-Myeng;Park, Moon-Ho 145
    https://doi.org/10.14775/ksmpe.2018.17.2.145 PDF KSCI
    This study deals with the method of determining the tip-over stability of a truck mounted on a high place operation car that is frequently used to carry out high-altitude work. Multibody Dynamics Program and Zero Moment Point (ZMP) theory are used to include dynamic effects during the car's high place operation. Through a combination of the Multibody Dynamics Program and ZMP, understanding the dynamic effects of the car's operating parts and building a detailed tip-over model of the car permitted a more precise prediction of the car's tipping-over behavior. It is also expected to help reduce the car's development time due to the time-effective simulation and provide safer work levels for the operating guide (in terms of working radius and lifting capability) with the dynamics effects.
  22. Sim, Ki-Joong;Moon, Hong-Ju;Jeon, Namjin 153
    https://doi.org/10.14775/ksmpe.2018.17.2.153 PDF KSCI
    This paper suggests a way to improve the strength of the driveshaft, which is a vulnerable part of the drive axle system, for a 3.5-ton commercial vehicle. The driveshaft is composed of a universal joint with a spider and yoke, yoke shaft, etc. The driveshaft is developed by choosing design parameters for the spider and yoke such as the diameter and distance through the structural analysis of the driveshaft's components. Some driveshaft design cases have been made and analyzed with ANSYS; the strength of the driveshaft parts are validated from these results to propose an optimal design case. Finally, we suggest a driveshaft system that satisfies the working conditions for a 3.5-ton commercial vehicle.
  23. Park, Dong-Hwan;Tak, Yun-Hak;Kwon, Hyuk-Hong 160
    https://doi.org/10.14775/ksmpe.2018.17.2.160 PDF KSCI
    The purpose of this study is to develop a process for forming a MPa ultra-high strength steel sheet to reduce weight and improve product strength. To do this, we performed the initial process design based on empirical formulas in a handbook and experience of skilled engineers, and researched the effects of major process variables on spring back by analyzing the forming analysis and experimental results. This paper suggests an optimal process design of the seat rail lower parts, using a MPa ultra-high strength steel sheet. This satisfies the dimensional accuracy and strength requirements for the product.