Page 15 - MetalForming March 2017

technology is said to replace manual hand polishing of tools, by using an automated peening hammer to improve surface finish. The hammer can make as many as 300 hits/sec. and impart forces to 180 kg/hit.
Dengensha America, Bedford, OH, has debuted a capacitor-discharge welding (CDW) machine that minimizes heat transfer and distortion problems during resistance spot welding. The compact machine reportedly is easy and intuitive to set up, and offers fabricators numerous features designed to optimize weld quality.
In testing performed by automakers, hammer-peened tooling (deep-draw tools for structural and outer-skin stampings, as well as bending/post-forming tools) using the MCF process exhibits not only finely polished surfaces but also improved surface hardness and increased wear resistance. Die-tryout time reportedly has been reduced, with a significant reduction in tooling cost.
The CDW machine operates with weld current to 50 kA, yet requires only a 6-kVA power supply. High current in short bursts minimizes heat transfer and workpiece dis- tortion, even when the power supply is unstable. Along with offering fabricators a broad range of part-production potential, the CDW machine proves ideal for welding small projection parts of high-strength steels and aluminum alloys.
accurapuls: www.accurapuls.ca
The NDZ-series CDW machines are designed with
unique, selectable current-control modes that enable
users to fine-tune weld quality. Selectable modes include Energy, Peak Current and Constant Current/Time. For example, users can optimize weld quality by setting the first weld to the Energy mode for weld strength, and then the second weld to Constant Current for post-weld heattreatment.
Dengensha: www.dengensha.com
Compact Capacitor-Discharge Welder Boasts Simple Intuitive Control
Tech Update