Absolute Machine Tools Submerged wire EDM offers large capacity, flexibility
USA – American company Absolute Machine Tools says that its new AU-1440iA Z800 Submerged Wire EDM is engineered to process larger and smaller parts with accuracy, speed and convenience. Its 1378 mm X-axis capacity, along with 787 mm in Y and Z, enable it to handle workpieces of up to 1712 mm x 1062 mm x 782 mm.
The machine structure, which was designed using Finite Element Analysis (FEA), includes a Meehanite cast honeycomb-type base, a highly ribbed column mounted with an oversized UVZ axis, and a reinforced lower arm to increase stiffness. The 148 mm U- and V-axes are located in a cabinet mounted above the working area for protection. All castings are stabilised in order to provide strength, reliable high precision and long durability when machining workpieces weighing up to 7,473 kg. The rigid structure and 20 mm C1 Class U-V ball screws are claimed to provide repeatable precision at high flushing pressures.
A precision-hardened stainless-steel workpiece-mounting table is designed to offer easy accessibility and to function as a standard clamping system, which means that a wide range of workpieces can be fixed quickly and accurately. The worktable can accommodate any commercial clamping system currently available.
Absolute says that Accutex’s proprietary automatic wire threading (AWT) system helps to boost machining speed by accomplishing fast submerged rethreading at the break point, which takes place without dielectric drainage/refilling, and helping to achieve spark-to-spark times as low as 15 seconds. The system also includes a scrap wire disposal unit, Absolute adds.
A 64-bit Widows CE-based PC CNC system drives machine axes via closed loop, directly coupled AC servomotors, with 8 millionths resolution confirmed by a Heidenhain linear glass scale feedback system, the company claims. The patented structure of the machine’s Hiwin linear guideways reduces up to 90% of friction and vibration. Resulting positioning accuracy is claimed to be ±0.0003 mm, repeatability at ±0.0002 mm in X and Y.