Development of the Manufacturing Capabilities of the Hydrostatic Extrusion Process. Volume I.

摘要

The effects of critical process variables on pressure requirements and product quality were studied for wrought and powder materials ranging from relatively high-strength easy to work materials such as aluminum alloys and steels to the relatively more difficult-to-work materials such as Ti-6Al-4V titanium alloy and superalloys. With these materials, fluids and lubricants tended to be the factor controlling pressure requirements and product quality. With almost every material extruded the limit in extrusion ratio was set by the design pressure capacity of the container except for the aluminum alloys where the limit was set more by the efficiency of the lubrication system. Tubing, mill shapes and wire were produced from a variety of materials. For tubing, the floating-mandrel arrangement enabled higher extrusion-ratio capabilities than those for solid rounds. An analysis of the beneficial effects of the floating-mandrel arrangement is given. T-sections were extruded from round billets and were re-extruded into smaller T-sections. In the reduction of T-sections and wire, a technique of hydrostatic-extrusion drawing developed at Battelle was used. This method, called the HYDRAW technique, was used to reduce wire of Ti-6Al-4V alloy, beryllium, and TZM molybdenum alloy wire at single pass reductions of up to 60 percent. That reduction appeared to be by no means the limit of single-pass reduction achievable with these materials.