Abstract
This chapter discusses some practical issues related to the role of drawing speed in analysis and the effects of drawing speed on lubrication. The drawing speed, at any segment of the wire route, is simply the distance a point in the wire travels in a unit time, such as meters per minute. Generally the drawing speed is treated as constant when coming off payoff systems and going onto take-up systems. The speed is also treated as constant between dies. As drawing speed increases, there is less time for such heat transfer and T0 increases. In high-speed drawing, with poorly conducting lubricants, the cumulative increase in temperature can present serious problems with lubricant stability and performance and with the metallurgical response of the wire. Deformation heating in a given pass does not depend on drawing speed unless there is a significant effect of strain rate on flow stress. Similarly, equilibrated frictional heating (downstream) from a given pass does not depend on drawing speed. The primary motivation for increased drawing speed is no doubt that of increased productivity, and with effective temperature control it may be practical to draw at very high speeds. Bench and heavy gage block drawing are generally undertaken at slow speeds, and lubricant design for such cases should take this into account.
Published Version
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