Papers by Keyword: Cutting

Abstract: This paper presents experimental data and discussions concerning “Elastic Working” which exploits the cutting of hollow glass cylinders at the longitudinal section. Here, “Elastic Working” indicates the cutting method for glass or ceramics using natural cracks occurring at the fracture points of brittle materials. “Elastic Working” has the significant characteristics that the amount of energy required is very small, the time required is very short, and so on. Hollow cylinders made of Pyrex glass were used in the cutting experiment. Using the presented cutting method, the hollow cylinders could be cut instantaneously at the desired longitudinal section. The experiment to examine the cutting load of the hollow cylinder was tried using brittle plaster material as well as glass. It was found that the cutting load of the hollow cylinder was consistent with the load determined from the radial crushing strength on “Sintered metal bearing”.

Abstract: The current cutting equipment and methods cannot meet the demand of offshore wind cut jacket. In order to solve this problem, we develop a new suit of offshore wind jacket intersecting line cutting equipment. In this paper, detailed structure and operating guide of the equipment have been presented. The characteristics and application range are also included. The new equipment is simple and practical.

Abstract: Jet Machining has significant advantages in processing precision, processing speed, environmental protection, and social benefits, etc. For years, it has been applied in the processing of a variety of materials processing successfully. This paper summarized research achievements on processing characteristics, flow field properties, particle distribution of many kinds of Jets (gas jet, water jet, supercritical carbon dioxide jet ) processing comprehensively and cutting performance for different materials (flexible material, brittle material, super hard materials). It will offer reference for further researching work and design of this novel method. In the meantime it will promote the application of jet processing in industrial production.

Abstract: The purpose of this study was to testing for difference in performance and injury risks between three different outsole configuration soccer boots on artificial turf. Fourteen experienced soccer players performed 45° cut test. They selected soccer boots with artificial ground design (AG), turf cleats boots (TF) and indoor boots (IN) randomly. A Vicon three dimension motion analysis system was used to capture kinematic data and Kistler force platform was used to record the ground reaction force. Novel Pedar-X insole plantar pressure measurement system was utilized to collect the plantar pressure synchronized. During 45° cut, artificial ground design (AG) showed significantly smaller peak knee flexion (p<0.001) and greater abduction angles (p<0.001) than indoor boots (IN). AG showed significantly greater vertical average loading rate (VALR) compared with TF (p=0.005) and IN (p=0.003). The results of plantar pressure found that AG showed the highest peak pressure and force-time integral in the heel (H) and medial forefoot (MFF). Artificial ground design (AG) and turf cleats (TF) may offer a performance benefit on artificial turf compared to IN. In summary, AG may enhance athletic performance on artificial turf, but also may undertake higher risks of non-contact injuries compared with TF and IN.

Abstract: The paper presents a review on the current situation of diamond tool ultrasonic vibration cutting ferrous metal. The key technology of diamond tool ultrasonic vibration cutting ferrous metals is presented in this paper and the influence of the processing environment of the presence of carbon atoms protective gas, the presence of carbon particles coolant of temperature control technology, ultrasonic vibration, workpiece material surface pretreatment or without on diamond tool wear rate and workpiece surface quality, the relationship between diamond tool wear rate, the workpiece surface quality and the ultrasonic vibration technology, processing environment, workpiece material surface pretreatment technology factors is given. Propose research direction and research emphasis on reducing diamond tool wear rate and improve workpiece surface quality.

Abstract: An innovative cutting method, constant load feeding method, is proposed as a high precision secondary working tool in CFRP cutting. The constant load feeding can restrain the occurrence of cutting defects such as burr and scuffing in a diamond saw cutting. The combining of constant load feeding with point contact eliminated most of the cutting defects even in the CFRP cutting with a low rigidity cutting tool like the diamond saw blade. In addition, there was no apparent cutting damage on the cutting surface obtained from the drilling with constant load feeding. These facts indicate that the self-generated feed rate in the constant load feeding would be the optimal feed rate to realize a defect-free drilling of CFRP composites.

Abstract: Knowing temperatures at the tool-chip interface is extremely important to optimize the machining condition and to improve the machining performance, furthermore to design high performance materials. In order to grasp the temperature distribution at the tool-chip interface, this study has devised an indexable insert with seven pairs of built-in micro Cu/Ni thermocouples on the rake face near the cutting edge. This paper shows the performance of the indexable insert with built-in micro thermocouples developed. The thickness of each element of the micro thermocouple is approximately 15 μm. The result of unsteady heat conduction analysis employing FEM shows that the temperature difference by installing the micro thermocouples is less than 10 K or 1.2 %. The temperature measurement experiments by cutting of aluminum alloy were carried out by changing the cutting speed. The results provided the evidence that the temperature distribution at the tool-chip interface can be grasped with the indexable insert with built-in micro thermocouples developed.

Abstract: This study aims to develop a cutting method, which enables to generate a localized hydrostatic pressure field in the vicinity of cutting zone in order to improve the machined surface integrity without causing unnecessary plastic deformation. In the previous work, a molecular dynamics simulation was performed using a newly developed cutting tool equipped with a planer jig with a rectangular hole for the cutting chip elimination, and it was confirmed that the developed cutting tool has advantages in giving a relatively high-hydrostatic stress field in the vicinity of the cutting zone and in suppressing the burr formation. In this report, further molecular dynamics simulation was performed in order to clarify the influence of jig shape on the cutting phenomena and machined surface integrity. As a result, it is found that a cutting tool of which front and side except for the rectangular hole are covered by the planer jig is the most advantageous for supplying high hydrostatic pressure and suppressing burr formation.

Abstract: Research direction connected with use topicality and problem of increasing of efficiency of processing by cutting the abrasion-resistant cast irons as a material for mining and processing equipment, which work in conditions of abrasion and hydroabrasion wear. Paper describes machinability by cutting new abrasion-resistant cast irons.

Abstract: The article presents the results of Technical University in Košice Faculty of Manufacturing Technologies Department of production processes operation and Technical University in Ostrava Physics Institute Liquid jet workplace cooperation in the area of operational states diagnosis of manufacturing systems with abrasive water jet technology (AWJ). Within the operational states diagnostics is the impact of selected technological parameters on technological head vibrations studied. Based on an extensive set of experiments are original graphical dependences determined of the abrasive mass flow and feed speed impact on the vibrations parameter - technological head vibrations acceleration amplitude of manufacturing system with AWJ technology. In addition to the original graphical dependences are in article new knowledge formulated in the area of science and research and recommendations for companies that operates manufacturing systems with AWJ technology.