Vollmer's VGrind 340S Grinds, Resharpens Very Small Carbide Tools
IMTS Spark: Vollmer’s VGrind 340S grinding machine is designed for producing and resharpening small, rotationally symmetrical carbide tools.
Vollmer’s VGrind 340S grinding machine is designed for producing and resharpening small, rotationally symmetrical carbide tools with diameters ranging from 0.2 to 12.7 mm. As such the machine is said to be ideal for applications in the electronics and medical engineering industries.
The machine features two vertical spindles for different grinding wheel sets, which makes it possible to reduce non-productive times. Five harmonized CNC axes achieve interpolation with short travel distances for the linear and rotary axes, which in turn reduces the time required to machine workpieces, the company says. In addition to the rotary axes, the linear axes are also designed as direct drives (linear drives). Unlike ballscrews, these non-contact axes are not subject to wear. The VGrind 340S also features a steady rest to ensure optimum concentricity. A back rest is available as an option for longer drilling tools.
NumrotoPlus software enables 3D simulation of the tool production process and makes it possible to carry out collision monitoring in advance. The height-adjustable and pivoting touchscreen control desk and the generously dimensioned view of the machining spaces provide ergonomic machine operation, the company says.
Optional solutions for automation, such as the HP 160 pallet magazine or the HPR 250 free-arm robot, ensure that machining of up to 900 tools with different shank diameters can continue unattended around the clock. The VGrind 340S features a replaceable dressing device for the grinding wheels to achieve optimal concentricity and axial runout for the wheel packages. An optional probe enables grinding wheel calibration in the machine and enables recalibration of the handling mechanism as often as required. A sticking unit enables the abrasive coating to be opened during production.
It sounds like a contradiction in terms-between centers and centerless grinding on one machine. But for some categories of workpieces, it's a viable production process that can yield machining time reductions of 45 percent over separate grinding operations.
In vertical grinding, the workpiece is held upright in a rotary chuck with the grinding spindle overhead. This configuration can improve roundness, facilitate single-setup processing and prolong the life of the machine. Loading and unloading may gets easier, too. Workpieces with relatively large diameters and short lengths benefit the most from vertical grinding.
The double-disc grinding process is consolidating its position in automotive applications but is moving into other industries. Double-disc grinders are now easier to operate, and they have added capabilities for control flexibility, precision process control, faster changeovers, and grinding of nontraditional materials.