Nissei presents optimized machine platform for grinding inserts

The VP3-400RW vertical double-disc grinding machine from Nissei Industry Corp. is optimized for surface grinding of indexable inserts made of carbide, cermet, or ceramic. (Courtesy: Nissei Industry Corp.)

Nissei Industry Corp. from Toyama, Japan, has been developing vertical and horizontal double-disc grinding machines for more than 40 years. Among other things, these machine concepts are used for grinding hard materials, one of the company’s core businesses in the Asian market. One application is the surface grinding of indexable inserts made of carbide, cermet, or ceramic. Nissei presented a machine optimized for this purpose, the VP3-400RW, at this year’s GrindingHub in Stuttgart.

When grinding indexable inserts, the demands on the mechanical and thermal stability of the processing machine are particularly high. The unit from Nissei has the corresponding rigidity, and this with a comparatively compact design. The Japanese manufacturer speaks of a unique, highly stable box-frame construction of the machine bed, which guarantees high-precision and consistent grinding results. In detail: Thickness variations of the ground indexable inserts with capability values of Cp/Cpk of well over 4 are achieved with dimensions of e.g.: 6.33 +/- 0.13 mm.

As the main drives for the two dia. 400mm diamond grinding wheels, the VP3-400RW contains two AC spindle motors with 15kW each. The internal workpiece feeder, which has a 180° swivel function and linear oscillation, is equipped with AC servomotors for high dynamics and fast set-up. The system is thus perfectly decoupled from external automation variants. For infeed and outfeed, Nissei offers an optional robot-supported workpiece pallet module with stacking function.

The control of the VP3-400RW is supplied by FANUC and allows various machining modes such as simultaneous grinding of both sides of the workpiece or grinding of the sides one after the other as well as grinding of only one side. The respective machining parameters can be stored and automatically called up for the different types of indexable inserts. Another important feature is the fully automatic dressing device, which can correct the shape on both grinding wheel surfaces simultaneously if required.

Nissei presented the VP3-400RW as a cooperation partner of Nagel Maschinen- und Werkzeugfabrik GmbH, Nürtingen.

Technical data of the VP3-400RW from Nissei:

  • Machine type: Vertical double-disc grinding machine for indexable inserts.
  • Typical materials: Carbide, cermet, ceramic.
  • Dimensions [mm]: Base area W 1,270 x D 3,200 x H 2,540 plus automation.
  • Total weight: approx. 6,000 kg.
  • Main drives: 2x AC spindle motors with 15kW each.
  • Grinding wheels: 2x D= 400mm.
  • Grinding method: plunge grinding + linear oscillation.
  • Workpiece size: max. radius of the circumscribed circle for inserts: (phi) 32mm.