Topics & News Release

Toyo Advanced Technologies Co., Ltd. (Head Office: Hiroshima, Japan; President: Yasuto Tatsuta) has developed and begun accepting orders for two new models in their series of large-size vertical grinding machines: the T-185C with a maximum grinding diameter of 1,600 mm and the T-186C, with a maximum grinding diameter of 2,600 mm.

Toyo began selling the T-184C ― a large-size vertical grinding machine with a maximum grinding diameter of 1,250 mm ― in October of last year, but these new larger high-end models were developed to meet the increasing need for grinding large workpieces. The T-185C comes in two types, a one-table specification type (T-185C) and a two-table specification type (T-185C-2T). The T-186C features two-table specification type (T-186C-2T), and achieves high-precision grinding of various faces with one chuck by using a swivel unit for the Z and W axes.

Floor space for the T-185C (W x D x H) is 5,600 mm x 4,500 mm x 5,470 mm for the one-table specification type, and 7,100 mm x 4,500 mm x 5,920 mm for the two-table specification type (T-185C-2T), and both types can handle workpieces with a maximum grinding diameter of 1,600 mm and a maximum weight of 2,000 kg. Floor space for the T-186C is 9,030 mm x 5,000 mm x 5,920 mm, and it can handle workpieces with a maximum grinding diameter of 2,600 mm and a maximum weight of 5,000 kg. Both models employ a hydrostatic bearing with high rotation precision for the work spindle, and realize high precision and high efficiency by using a high-frequency wheelhead for the grinding wheel spindle. This high-rigidity, high-output wheelhead (output 30 kW, equipped with auto-balancer function and AE sensor) is specially designed for large-size vertical grinding machines, and has an established reputation with the T-184C.

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  Ultra-large-size vertical grinding machine
  T-185C(T-185C-2T)

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  Ultra-large-size vertical grinding machine
  T-186C(T-186C-2T)

Main Features of the T-185C & T-186C

◆High-precision, High-efficiency grinding

The T-184C features optimized basic structures in elements such as the base and column, coupled with even higher rigidity throughout the machine. It also provides high levels of precision and efficiency in grinding through the use of components such as hydrostatic bearings and an electropermanent magnetic chuck and wheelhead specially designed for large-size vertical grinding machines.

1. Parts around the work spindle

   A hydrostatic bearing with high rotation precision is used for the work spindle. The maximum chuckable workpiece weight is 2,000 kg for the T-185C and 5,000 kg for the T-186C. By using an electropermanent magnetic chuck that is energized only when the workpiece is loaded and unloaded, the system achieves stable, high-precision grinding which is resistant to the effects of heat generation.

2. Wheelhead specially designed for large-size vertical grinding machines

   The grinding wheel spindle is equipped with the high-rigidity, high-output HFB0028-300 high-frequency wheelhead which has an established reputation with the T-184C. The HFB0028-300 was developed specially for ultra-large vertical grinding machines. It is capable of 2,800 rpm, has a maximum output of 30 kW, and boasts outstanding features such as a built-in auto-balancer and AE (Acoustic Emission) sensor for high-precision, high-efficiency grinding of large workpieces.

3. Z/W-axis swivel unit

   A servomotor-driven swivel unit is used for the Z-axis and W-axis tables (two-table specification type). The table rotation angle is -1°to 36°for the T-185C, and -1°to 47°for the T-186C, so the tapered faces of workpieces can be machined to high-precision.

4. TOYOMATIC-4000

   These machines are equipped with our unique high-functionality/interactive TOYOMATIC-4000 CNC unit. In addition to conventional grinding cycle programs, the system has been enhanced with a variety of features for a large-size vertical grinding machine, such as variable speed control of work spindle rotation, and angle input teaching for Z and W-axis swivels.