SHIGIYA have further developed their Vertical Cylindrical Grinders to include Polygon & Eccentric grinding and also with a larger capacity.
This new model has been developed from the very successful GAV (angle approach) vertical cylindrical grinder, which was first launched in 2011. The new model known as the GPV-10.20R(C-X) has increased capacity with a maximum part size of 70mm dia X 200mm long, with a machine swing of 100mm. The new ‘C-X’ version has the ability to also grind precision Polygon and Eccentric parts with a range of 14 different forms as standard using C-axis and X-axis interactive control. Options include; Auto-wheel changer, variable wheel speeds, rotary dressing device, In-process gauging, Auto centre distance adjustable tailstock, and others.
Taking up the very minimum of floor space of just over 1m² (860mm X 1,530mm) the vertical concept also allows for very effective auto-loading from a simple loading station to robotic systems and machine cells, linking machines together for maximum production. The standard configuration of the Polygon version has a C-axis workhead, hydraulic tailstock, 355mm dia wheel available with up to 60m/sec. As with all Shigiya grinders the wheelhead is their own patented non-concentric hydrodynamic bearing system for the wheel spindle, which offers the very best vibration free grinding, low thermal displacement ensuring high quality and precision with exceptional life.
Examples of eccentric & polygon forms
This vertical concept has been further enhanced with readily accessible features for the operator with no compromises when loading, checking parts, setting etc. and ease of maintenance. The machine enclosure has been designed so that all covers and guards can be removed in just a few easy steps, this ensures accessibility into the most remote parts of the machine, particularly useful for the adaption of auto-loading systems and linking machines together with the minimum modifications.
Also worth mentioning is the great manufacturing depth to which SHIGIYA goes – all mechanical processing including assembly is performed by Shigiya in their factory in Japan. This is in keeping with the fundamental philosophy of Mr. Shigitani (General Manager and proprietor of the Shigiya machinery company). “Only through a high degree of in-house production will our company be able to control quality down to the smallest detail and guarantee the customary high standard of quality to our customers”. These words go straight to the heart of the matter.
Infeed is performed by the table moving towards the wheel, using very high rigidity slides. Superior rigidity allows for high and stable accuracy from a cold start, even during post-process grinding. Testing example of 30 steel parts continuously plunge grinding a workpiece 15mm dia X 60mm long hardened to 58Rc with an infeed of 0.1mm, without using an in-process gauge, resulted in a maximum error of 0.003mm on dia, results showed -0.001 to + 0.002, grinding time 6.7 secs.
The machine is equipped with the latest generation of Fanuc 31i series controllers. The market has clearly demonstrated its approval of Fanuc controllers, with more than 2.5 million units in use worldwide. Combined with the advanced Shigiya user interface and computer technology, this controller is a prime example of high reliability, precision and speed as well as ease of operation.
As can clearly be seen in the development and design of this machine, SHIGIYA has brought a machine to the market that is aligned with the needs of flexible production. With standard Shigiya features such as high productivity, excellent repeat accuracy, ease of operation and exceptional reliability, this machine guarantees cost-efficient production of small shaft parts with eccentric and polygon forms.
