Design of a Hydraulic Bending Machine

摘要

To keep pace with customer demands while phasing out old and unserviceable test equipment, the staff of the Engineering Mechanics Laboratory (EML) at the USDA Forest Service, Forest Products Laboratory, designed and assembled a hydraulic bending test machine. The EML built this machine to test dimension lumber, nominal 2 inches thick and up to 12 inches deep, at spans up to 20 feet and loads up to 20,000 pound-force. The hydraulic bending test machine was built using parts of a 100,000-pound-force compression test frame. Added components included W12 by 65 steel beams; steel tube sections, L-sections, and threaded rods for beam attachment; I-beam spacer plates; wood block beam end supports; a 4-inch bore, 10-inch stroke hydraulic cylinder with 38,000 pound-force capacity; steel plates for cylinder reinforcement; and two pivoting four-point load head assemblies.