Face Of Wheel Research Articles

REVISION OF JAPANESE SAFETY STANDARDS OF BICYCLE WHEEL GUARD FOR PREVENTING CHILDHOOD INJURY DUE TO WHEEL SPOKE

Background/PurposeBased on our collected 17 966 cases of injury data, frequency distributions of injured parts of body (figure 1) can be calculated and it is useful for understanding trends of...

Diamond face grinding of WC-Co composite with spark assistance: Experimental study and parameter optimization

Electro-discharge machining (EDM) characteristics of tungsten carbide-cobalt composite are accompanied by a number of problems such as the presence of resolidified layer, large tool wear rate and thermal cracks. Use of combination of conventional grinding and EDM (a new hybrid feature) has potential to overcome these problems. This article presents the face grinding of tungsten carbide-cobalt composite (WC-Co) with electrical spark discharge incorporated within face of wheel and flat surface of cylindrical workpiece. A face grinding setup for electro- discharge diamond grinding (EDDG) process is developed. The effect of input parameters such as wheel speed, current, pulse on-time and duty factor on output parameters such as material removal rate (MRR), wheel wear rate (WWR) and average surface roughness (ASR), are investigated. The present study shows that MRR increases with increase in current and wheel speed while it decreases with increase in pulse on-time for higher pulse on-time (above 100 µs). The most significant factor has been found as wheel speed affecting the robustness of electro- discharge diamond face grinding (EDDFG) process.

The Mathematics Model of Mechanism Forming the Spot Face of Rolling Wheel

The mathematics model of mechanism which forms the spot face of rolling wheel is offered. It allows solving tasks involved in design and calculation of wheel propeller of different constructions, determining theirs numerical and qualitative characteristics when moving on different types of surface.

非球面製作法に関する研究

As a result of the demands for better and better performance in modern optical systems and with the advant of electronic computation methods in optical design, the requirement for the improvement of the fabrication techniques of aspheric surfaces is increasing.A machine has been developed for the fabrication of axially symmetric aspherics of optical uses, grinding, smoothing and polishing by the use of various tools, so that the accuracy of the fabrication may depend on the machine but not on the skill of an operator. This machine with high accuracy is composed of two main simple mechanisms, i.e., turning and swivelling of workpiece and rectilinear movement of a flat face of wheel. The arrangements was determined by the analysis of the relation between the aspheric surface and the flat face of the wheel which is tangent to the aspheric surface. Further, a special design has been made so as to obtain high surface accuracy and optical finish, by making successive use of a diamond wheel, a plastics bonded wheel and an elastic polishing wheel. Several machines are now in operation for a large scale production.In this paper, the principle and performance of this machine are described in details.