• Journal of the Korean Society for Precision Engineering
• /
• v.18 no.3
• /
• pp.53-60
• /
• 2001

Water jet cutting is a new technology using very high pressure water as a cutting tool. Water jet cutting system consists of water preparation part, pressure generation pate, cutting head, and motion part. A PC-based numerical controlled (PC-NC) X-Y table is developed and water get cutting system is installed thereon. Water jet machining is applicable to various kinds of materials ranging from soft materials such as rubber and meat to hard-to-cut materials such as titanium. This paper shows the application of the abrasive waterjet system to titanium cutting.

• Journal of the Korean Society for Precision Engineering
• /
• v.14 no.9
• /
• pp.52-60
• /
• 1997

This paper proposes the effective method of the software based motion control by using lenear, exponential and bell type discrete filters for acceleration and deceleration of servo motors. Recursive filters are designed in discrete time domain which can reduce computation time and vibration of motors due to load disturbance. Also it deals with the method which decides the time constants of filters when a machine tool is driven at rapid, cutting and jog feedrate. Validity of the proposed method is verified by corner cutting experiments.

• Journal of Biomedical Engineering Research
• /
• v.44 no.2
• /
• pp.109-117
• /
• 2023

In this study, the effect of the shape of the specimen and the feedrate of the dental ultrasonic surgical instrument on the cutting force and surface roughness of the specimen is analyzed. Experimental specimens were made of SAWBONES artificial bone materials in square and spherical specimens. In addition, the cutting feedrate of the surgical instrument was controlled through the developed moving system. The cutting force generated when cutting the specimen was measured through a force sensor. After the experiment, the cutting surface of the specimen was observed through a three-dimensional optical microscope and the surface roughness was measured. Through one-way ANOVA, the effect of each specimen shape and feed rate on surface roughness was analyzed. As a result of the experiment, the cutting force increased proportionally in the initial feed rate increase stage, but the increase in cutting force decreased as the feed rate continued to increase. Also, the cutting force showed a difference according to the shape of the specimen. The spherical specimen with a relatively small cutting surface area had less cutting force than the square specimen. However, as a result of one-way ANOVA, it was found that the specimen shape and feed rate did not affect the surface roughness. In future studies, it is expected to be used for comparative analysis of ultrasonic surgical instruments and correlation analysis between cutting factors.