Sunnen tops out vertical honing range with 200 mm bore capacity SV-490

The Sunnen SV-490 is equipped with a 7.5 kW 5-500 rpm variable speed spindle and a 7.5 kW 1-130 strokes-per-minute DC stroker, capable of producing 1,360 kg thrust. The servo-controlled rotary tool feed system produces 25.4 Nm of torque for fast, accurate machining with diamond and super-abrasive tools. The feed system can be optimised for each application by either operating as a rate system or feeding to a constant spindle load. This capability, coupled with the standard features such as sizing, spark-out, cross-hatch, and two-stage honing allows users to tailor machine operations to the tooling/abrasive combination best suited to the application. These features compensate for part variation and allow the SV-490 to produce more consistent surface finishes with better tool life and optimised cycle time. Compared with horizontal machines, the SV-490 platform eliminates the need to rotate the workpiece during honing to prevent centre line shift due to tool and workpiece weight. The vertical design machine occupies 6.46 m2 of floor space and the stationary column provides stability required for long-stroke machining on parts up to 900 kg with diameters from 19 to 200 mm. A Windows-based industrial PC control system allows intuitive set-up for stroke, crosshatch angle and other parameters, with capability for dwelling the tool in multiple areas to correct part geometry or process blind bores. The SV-490 can be equipped for in-process air gauging with Sunnen's PH hone head, or with post-process air gauging. A bore profile display indicates bore straightness throughout the cycle and an optional post-process gauging system with SPC software allows data collection and machine process control to submicron tolerances. A multi-axis hand wheel allows fine tuning of vertical stroke and honing tool position. The SV-490 is built on a heavy-duty cast iron base for rigidity and vibration damping, with a T-slot table in the base for ease of fixturing. The design of the machine's door allows easy access for large parts and allows for fully automated robotic parts loading. The SV-490 is the latest addition to the SV-400 modular series which covers a wide variety of honing applications, such as engine blocks, hydraulic blocks, compressors, large connecting rods and bearing sleeves. Tooling choices include Sunnen's diamond or Borazon multi-stone tools including PH, CV/CK cylinder honing tools, GHSS single-stage and GHTS two-stage tools, P20 and P28 mandrels for long-bore honing and MPS modular tooling.