CAE를 활용한 고강도강판(SPFH590)의 셰이빙 가공 시 클리어런스가 전단면 형상에 미치는 영향에 관한 연구

성시명 한국금형공학회 2024 한국금형공학회지 Vol.18 No.2

The automobile industry is a wide range of related industries, including parts manufacturing and vehicle assembly, press processing is an essential element in making automobiles. Press processing is a processing method for metal sheets that has relatively high dimensional and shape precision and is suitable for mass production. It refers to processing by attaching a special tool, a mold, to a press machine. Recently, the automobile industry is attempting to reduce the weight of automobiles in order to reduce carbon emissions due to global warming, and the use of high-strength steel sheets, which are lighter than general structural steel sheets, is a natural trend. Shear processing is required to use high-strength steel, and the shape of the shear surface created by shear processing has a significant impact on the quality of the automobile. Therefore, various methods are being attempted to improve the shear surface during shear processing. Among them, shaving processing is a method of shearing the primary shearing area again, and it is difficult to obtain an accurate answer because complex deformation occurs in the microscopic shear area. Therefore, in this study, the effect of machining allowance on shaving processing was analyzed using the finite element method using high-strength steel plate (SPFH590), and the differences were compared and examined through actual experiments under the same conditions.

진공소결을 통한 자동차용 인사이드 미러 접합부의 스테인레스강 선정에 관한 연구

성시명,정인룡,Sung, Si-Myung,Jung, In-Ryung 한국금형공학회 2018 한국금형공학회지 Vol.12 No.1

The car requires an inside mirror installed between the driver's seat and the passenger's seat to ensure the driver's rear and side view of the driver. Inside mirrors must always be attached to the vehicle to ensure the driver's visibility. Inside mirrors attached to the windshield of a vehicle are always exposed to direct sunlight and should be semi-permanently usable in hot and humid summer weather in Korea. Therefore, the mirror mount, which is the junction of the inside mirror, is particularly important in corrosion resistance and wear resistance suitable for humidity. Mirror mounts are currently difficult to manufacture due to their reliance on powder molding technology in advanced countries such as Japan and Germany. This paper focuses on the fabrication of high corrosion resistant stainless mirror mounts by vacuum sintering technique and focuses on the selection of materials suitable for the production of mirror mounts through experiments of 300 series stainless steel and 400 series stainless steel manufactured by vacuum sintering.

CAE 해석을 이용한 오토바이 리어카울 사출성형에 관한 연구

성시명,정상준 한국금형공학회 2019 한국금형공학회지 Vol.13 No.4

In this paper, in order to improve the formability and quality of the injection molded parts in the molds for molding the motorcycle rear cowl injection molded parts with different volumes at the same time, the flow of the molded parts is changed through the injection molding CAE analysis by changing the gate position, runner size and position. It is to find the optimum gate position, the diameter of the runner and the position where the balance is equal. The molded article formed by the optimization resulted in the uniformity of the molten resin at the same time at the corner of the product, thereby maintaining the flow balance favorable for mass production at lower injection pressure.

CAE를 이용한 초음파 나이프 트랜스듀서 설계

송기혁,김혜진,성시명,홍서연 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.5

This study aimed to design and verify ultrasonic knife modules, which have experienced a recent surge in demand. To this end, ultrasonic transducers and horns with longitudinal vibration characteristics of 40 kHz grounded in theoretical equations were designed. Subsequently, tensile experiments on materials were conducted and applied for precise wavelength analysis. Modal and harmonic response analysis using CAE was performed to predict vibration characteristics and natural frequencies for the designed ultrasonic knife. As a result of the analysis, the study revealed that the knife had an intrinsic frequency characteristic of about 38.1 kHz and vibrated in the axial direction. An ultrasonic knife, stemming from these findings, was manufactured and confirmed to achieve equivalent performance to the design, through resonance frequency analysis and vibration mode analysis.

나노초 레이저 가공을 활용한 초소수 표면 특성을 가지는 사출 금형에 관한 연구

박정래,김혜진,박지영,성시명,홍서연,송기혁 한국금형공학회 2023 한국금형공학회지 Vol.17 No.3

In this study, an injection mold with ultra-small surface properties was manufactured using nanosecond laser processing. A superhydrophobic characteristic analysis was performed on the PET specimen manufactured through this. To this end, a hydrophobic pattern was defined using the Cassie-Baxter model. The defined features were selected with a spot diameter of 25um and pitch spacing of 30um and 35um. As a result of the basic experiment, it was confirmed that the fine pattern shape had an aspect ratio of 1:1 when the pitch interval was 35um and 20 iterations. Through the determined processing conditions, a hydrophobic pattern was implemented on the core surface of KP4. A specimen with a hydrophobic pattern was produced through injection molding. The height of the molded hydrophobic pattern is 20 μm less than the depth of the core and the contact angle measurement results are 92.1°. This is a contact angle smaller than the superhydrophobic criterion. Molding analysis was performed to analyze the cause of this, and it was analyzed that the molding was not molded due to the lack of pressure in the injection machine.

KP4A 금형의 5축 가공을 위한 공구각 최적화와 표면 거칠기 분석

박지영,박지혜,김수현,성시명,김혜진,김승권 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.5

Injection molding is a process of shaping resin materials by heating them to a temperature above their melting point and then using a mold. The resin material is injected into and cooled within the mold cavity, solidifying into the desired shape. The core and cavity components that make up the mold cavity are crucial elements for the precision molding in injection molding. In the case of precision mold production, the application of 5-axis machining technology is required to ensure high machining quality for complex shapes, and among these factors, the tool angle is a critical machining condition that determines the surface roughness of the workpiece. In this study, we aim to measure the surface roughness of the machined surface of KP4A specimens during machining processes with variations in the tool angle and analyze the correlation between the tool angle and surface roughness.

CFRTP 소재 가공을 위한 초음파 나이프 적용 가능성에 관한 연구

송기혁,김혜진,박지영,성시명 한국금형공학회 2023 한국금형공학회지 Vol.17 No.2

In this study, an experiment was conducted to confirm the applicability of the external shape control of the ultrasonic knife to the CFRTP material, which is the base material of thermoplastic. TC910 based on polyamide6 (PA6) was used as the material. The slope 와 and tool transfer speed of the material and tool were selected as process factors for processing, and the following results were obtained. Under all cutting conditions using an ultrasonic knife, friction heat caused by high-frequency vibration was issued at 150℃ at the contact part between the material and the knife during cutting. As a result of the cutting force analysis, the faster the transfer speed, the higher the cutting force as the angle of entry of the blade increased, and the size of the cutting force changed during cutting. As for the size of the burr in accordance with the transfer speed condition, the smallest burr occurred at 150mm/min in the side part, and the smallest burr occurred at 150mm/min and 200mm/min in the case of the outlet burr. The size of the burr according to the entry angle tended to decrease as the tool entry angle increased, and the side part tended to increase as the tool entry angle increased. As a result of the cutting surface analysis, it was confirmed that the base material was eluted under all conditions, and the faster the transfer speed, the lower the elution phenomenon of the base material. Based on the above results, cutting the CFRTP material with an ultrasonic knife is possible, but the effect on heat generation caused by friction needs to be minimized, and further research needs to be conducted on this.

CAE 를 활용한 덴탈 임플란트 부품 자동 포장 검사 시스템에 대한 구조적 안전성 분석

송기혁(K. H. Song),성시명(S. M. Sung),김선삼(S. Kim) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.5

CFD 유동해석을 통한 하수 처리장의 소수력 발전 잠재용량 예측에 관한 연구

임동욱,김혜진,박지영,성시명,송기혁 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.4

Small hydropower systems have emerged as an attractive solution for areas with low head and flow rates, offering versatility for implementation in diverse locations such as rivers and wastewater treatment plants. This research specifically focuses on exploring the potential of small hydropower generation within wastewater treatment plants. Through the utilization of computational fluid dynamics (CFD) analysis, the study successfully predicted the torque and power generation capacity of the installed turbine. The analysis underscored the effective control of fluid flow achieved through careful turbine design, including considerations of blade shape and quantity. For instance, in the case of the Tancheon wastewater treatment plant, the study revealed the ability to generate a torque of approximately 7000 Nm, translating to an estimated power production of around 48.3 kW per hour. Ultimately, this research significantly contributes to evaluating the feasibility and viability of small hydropower generation within wastewater treatment plants.

셰이빙 공정에서 클리어런스에 의한 전단면의 크기 변화에 관한 연구

정상준 ( Sang-jun Jeong ),성시명 ( Si-myung Sung ) 산업진흥원 2016 산업진흥연구 Vol.1 No.2

본 연구에서는 고장력강판(SPFH590)을 이용하여 1차 일반전단가공의 클리어런스가 2차 셰이빙 공정에 미치는 영향에 대하여 실험을 통하여 고찰하였다. 실험 결과 일반전단가공의 클리어런스 15%의 경우에서는 셰이빙에 의해 파단면이 완전하게 제거되지 못하여 일부 잔존하였으며, 일반전단가공 10%로 전단한 제품의 셰이빙 가공에 의한 전단면의 크기가 넓게 되는 것을 알 수 있었다. 일반전단가공 10%로 하고, 셰이빙 클리어런스 2%의 경우에는 93%의 전단면이 발생하였으며, 클리어런스 3%에서는 87%의 전단면이 발생하는 것으로 나타났다. By using the high tensile steel plate (SPFH590) 1 Primary normal shear process clearance was studied through an experiment for the effect of the second shaving process in this study. Experiment result, Shaving process in the case of processed 15% of the Primary normal shear process clearance was some residual surface does not remove it completely. and Shaving process of shearing products by the general shearing process clearance of 10% it was found that the wider the size of shear surface. The shear surface of 93% occurred in case of the clearance of general shearing process is 10% and the Shaving clearance is 2%, The shear surface of 87% were to occur in case of the Shaving clearance is 3%.