This research investigates into using a highly efficient magnetic abrasive finishing (MAF) method to refine the surface of an Inconel 625 bar intended for use as a stem in a hydrogen solenoid valve. In contrast to the previous choice of STS 316 material, Inconel 625 was selected due to its superior properties. The cylindrical surface of Inconel 625 bars underwent polishing using the super-fast MAF process, employing varying rotational speeds ranging from 1000 to 25,000 RPM and a potent magnetic field of 550 mT. The study evaluated the polishing outcomes concerning abrasive type, rotational speeds, and processing duration. The results demonstrated the achievement of an exceptionally smooth surface on the Inconel 625 bar, with the surface roughness (Ra) reduced significantly, reaching 0.03 μm under optimal conditions. These conditions included employing carbon nanotube (CNT) particles of 0.04g, PCD diamond abrasive of 1g, Fe of 9g, 0.5g of light oil, and a processing time of 16 minutes at 15,000 RPM. Furthermore, Ansys analysis confirmed the mechanical integrity of the polished Inconel 625 bar, exhibiting suitable strain, equivalent stress, and safety factors. This substantiates the feasibility of employing Inconel 625 bars in hydrogen tanks, surpassing the conventional STS 316L bars.

In the semiconductor manufacturing clean room, contamination that directly affects process yield is managed through the operation of a monitoring system that measures molecular contamination in the air. In this study, I presented the component inspection method, test conditions, and judgment criteria through the life test of the solenoid valve that will be applied to the sampling module of the AMC Monitoring System.

The Calorifier is a device that supplies hot water to the crew for showering and cooking. In particular, problems such as hot water not coming out when a trainee and a crew member take a shower at the same time may occur due to a malfunction of the temperature control valve that controls the temperature. In particular, when the hot water usage time is almost constant, such as a training ship, a high calorific value is required. When there is no dissatisfaction with the use of hot water, satisfaction with the educational environment is improved. Therefore, in this study, a solenoid temperature control valve is applied to increase satisfaction with hot water use, and a mechanical time switch is applied to the hot water circulating water pump to save energy.

This paper investigates the waveform analysis of voltage and current waveform from CRDI engine. It is on developing on analysis method of waveform CRDI Diesel engine. The experimental methods using Pico oscilloscope are employed to measure current and voltage waveform of solenoid injector from CRDI engine. The one normal and two abnormal solenoid injectors are used. The experiment is carried out during no-load condition. A summary of the important results are as follows. 1) The area of the voltage and current waveform of the abnormal injector becomes larger than the that of normal injector. 2) The area of the current waveform can be obtained more accurate results than that of voltage waveform.

The latest cultivation research and development of seeding technology was improved because the demand for direct planting increased. The Programmable Logic Controller (PLC) and position sensor are utilized to control the seed detection system. In this paper, of seed types, RPM (Revolution per minute) variations and hole size are considered to determine the capacity of seeder hopper to meet the needs of customer demand. These algorithms were composed of the process of seed monitoring and the compulsion opening system. The capacity of seeding is assumed to be 1.53kg(11.6 liters) of rice seed per 1.8km. Therefore, this detection system can be used to determine the capacity according to seed types, RPM and hole size.

This paper presents a six sigma application case study for an automobile PCSV manufacturing process using rolled throughput yield improvement activity. Hidden factor and first yield concept is introduced and DMAIC procedure is implemented to maximize the first pass yield. The result of the six sigma project amounts to the reduction of failure cost of 0.1 billion won per year in the PCSV manufacturing process. This paper can benefit six sigma practitioners in some ways.

Generally, the three position solenoid valve has veen used for the hydraulic steering gear on account of it’s low cost, simplicity in device, etc. But, there is some off-set because of dead-zone which exists in on-off valves. In this paper, we proposed a combined controller which was added an integral controller to an only on-off one in hydraulic steering gear control system used low speed three position solenoid valve. Experimental results show that the off-set is removed, and the number of valve switching is reduced considerable. The validity of proposed method comparing with an only on-off control was proved by the response experiments.