Topics & News Release
2006/4/25
T-183C large-size vertical internal grinding machine developed by Toyo
-Supports high-precision machining of work with an inner diameter of up to 700 mm, the largest specification available from Toyo -
Toyo Advanced Technologies Co., Ltd., (Head Office: Minami-ku, Hiroshima; President: Kenichi Yamamoto) today announced the release of the newly developed T-183C, a large-scale vertical internal grinding machine capable of machining work with an inner diameter of up to 700 mm.
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From last year, Toyo has steadily been introducing new models in its series of vertical internal grinding machines, with the T-181C (chuck type) compact model and T-182S (centerless type) midsize model already on the market. The T-183C is the third product to appear in the series and the largest model yet. This large-scale chuck type internal grinding machine is capable of handling even larger work pieces than Toyo's large-size horizontal internal grinding machine, which has a maximum work inner diameter of 610 mm.
The T-183C employs a Z-axis (table axis) with hydrostatic six-face restraint guides, a hydrostatic screw, and hydrostatic bearings. The Z-axis and X-axis (cross-slide axis) use linear scales permitting 0.1µm feedback control. This, combined with the high-precision bearings used for the workspindle, enables machining of extremely high accuracy. The workspindle is powered by a 7.5 kW AC servomotor. Two types of high-frequency wheelhead are available as options for enhanced efficiency: one with a grinding spindle of 15,000 rpm and output 14.6 kW and the other with a rotation rate of 10,000 rpm and output of 23 kW.
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In addition to internal grinding, the T-183C can also machine the outer diameter and end faces of work pieces. It can handle work with a maximum inner diameter of 700 mm, maximum outer diameter of 750 mm, and maximum width of 500 mm. The T-183C is suitable for high-precision machining of large parts such as spindle housings for machine tools, cylinders for construction equipment, and large bearings for railroads. The optional automatic tool changer (ATC) makes it possible to grind various surfaces with a single chucking operation. There is also an automatic pallet changer (APC) available for unmanned operation.
Toyo Advanced Technologies was the first Japanese machine tool manufacturer to produce a cumulative total of 10,000 internal grinding machines and is considered a leader in the field. In addition to its well-established horizontal models, Toyo is also concentrating on the development of vertical internal grinding machines. Toyo will be continuing to develop even larger-scale vertical internal grinding machines while introducing new models based on its existing products. As a leading manufacturer in the field, Toyo plans to broaden its line of internal grinding machine models in the years ahead.
Main Features of T-183C
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Basic Specifications
Floor space: (W × L× H)
2,900mm×3,100mm×3,900mm
Max. chuckable work dimensions
750 mm (outer diameter), 500 mm (width)
Max. grindable work inner diameter
700mm
Table travel
630mm
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High-Precision Machining
The T-183C incorporates measures such as a column cooling system to suppress heat deformation, a weak point of conventional vertical grinding machines. In addition, the Z-axis (table axis) employs hydrostatic six-face restraint guides, a hydrostatic screw, and hydrostatic bearings. Low contact friction and high attenuation of vibration provide highly precise feed, realizing a straightness of 0.5µm/600 mm or better.
The Z-axis and X-axis are equipped with linear scales. Feedback control enables positioning accuracy of 0.1µm for machining of extremely high accuracy.
The workspindle is supported by high-precision bearings and powered by a high-output 7.5 kW AC servomotor. This allows for precise grinding of heavy parts. (Machining results using model piece: roundness 0.3µ m, surface roughness 0.1 µm Ra.)
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High Machining Efficiency
The grinding spindle is a key element in achieving machining efficiency. Toyo offers as options two types of high-frequency wheelhead that were developed by Toyo and provide high output and rigidity. The HFB015-146 has a rotation rate of 15,000 rpm and output 14.6 kW, and the HFB01-230 has a rotation rate of 10,000 rpm and output of 23 kW. Combined with the high-rigidity of the T-183C itself, these wheelheads deliver consistently high precision and excellent machining efficiency.
The T-183C is equipped with TOYOMATIC-4000, a high-performance, conversational CNC system available only from Toyo. It supports various operations, including automated grinding and continuous multi-face grinding.
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Process Integration
A number of machining programs are available, including internal, external, end face, and back end face grinding. This allows multiple grinding operations to be performed on the work piece in a single chucking. Multiple operations can be performed on a single work piece as part of one process, rather than several.
The optional automatic tool changer (ATC) makes it possible to grind multiple surfaces of a work piece, using grinding wheels optimized for each face.
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Automation
A touch probe is available as an option, making it possible to achieve consistently excellent dimensional precision in unmanned operation. It allows highly accurate automatic measurement of the finish stock removal required following rough machining. This enables automated operation while maintaining consistently high dimensional accuracy. The touch probe can also be used for checking the work piece configuration in order to protect the grinding wheel against mechanical impacts and damages.
An automatic pallet changer (APC) is available as an option. It allows work to be prepared outside of the machine, thereby boosting the operation rate of the equipment. When combined with the ATC and/or touch probe, unmanned automated grinding is possible.