THE SLOW EXTRUSION OF METALS. PART III
A technique was developed for determining the temperature distribution set up inside a metal slug during extrusion. A study was made of the eifects of extrusion method, type of product, reduction, punch speed, slug dimensions, die geometry, and lubrication on the extrusion pressure, the temperature rise, and the deformation pattern produced inside the slug. Rods, tubes, and tubalar containers of chemical lead (Grade A), aluminum (99.5% purity), E.R.H.C. copper, and 70/30 brass were extruded at room temperature at punch speeds varying from 1 to 6 inches per minute. All slugs, excepting those used in the study of slug dimensions, were of 1 inch diameter and 1 inch high. The investigation showed that the extrusion pressure was largely influenced by the reduction in cross- sectional area of the extruded product snd to a lesser extent only by the remaining variables. The deformation pattern set up in the extruded product was chiefly dependent on the reduction and on die geometry which also had an appreciable effect on the incidence of piping. The major factors contributing to the rise in temperature inside the slug during extrusion were the reduction and the punch speed, the latter presumsbly governing the amount of heat lost by conduction through the die, the chamber, and the punch. The application of the technique in the study of possible localized temperature effects due to the remaining process variables is being pursued. (auth)
- Research Organization:
- Gt. Brit. Mechanical Engineering Research Lab., Glasgow
- NSA Number:
- NSA-15-018457
- OSTI ID:
- 4009545
- Report Number(s):
- NP-8368 MERL-102
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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