31.8.2015 Pressing & Sintering

New method for high density Powder Metal parts

In order for Powder Metal (PM) to increase market share there are two factors that have a significant influence. The two factors are strength and cost There are methods on the market such as Surface Densification by rolling, shot peening, powder forging and some other proprietary methods that will increase strength but the common denominator for all methods are increased cost and sometimes other draw backs. In this paper a method for Hot Isostatic Pressing (HIP) of PM parts is presented. The container needed for HIP of PM parts is very costly and impossible to make in the shape of a gear wheel. This paper will demonstrate a method for HIP:ing gears and components in PM without a container thus eliminating a big part of the cost for the HIP process. The strength benefits will be demonstrated as well as the cost situation for HIP:ing of a gear to full density.