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Mills unveils Doosan Puma lathes for CNC machining
Mills CNC unveiled a new range of Doosan Puma lathes at the recent Mach exhibition.
The machine structure of the new Pumas has benefited from the application of Finite Element Analysis (FEA) to determine static and dynamic stiffness, leading to a more stable, better damped structure for increased accuracy.
Another key feature is that the range is modular, seeing the use of common parts across all models.
This has helped keep costs down and means that, despite a significant improvement in technology and performance, the Puma lathes don't cost much more than the older models they have replaced.
The new Pumas' machine base casting has been increased by up to 158 per cent; their box guideways have been made 50 per cent thicker; and the saddle width along the Z-axis has been increased, as has the distance between Z-axis slideways.
Other design-and-build mechanical improvements have seen the mounting area for the headstock being increased by 90 per cent and the mounting area for the sub-spindle increased by 50 per cent, increasing overall rigidity.
In addition to these improvements, the effect of heat-generating elements has also been considered.
So, the heat generated by the hydraulic power pack is directed away from the machine and hot air is driven upwards out of the control cabinet with a heat wall between it and the machine.
Heat from the main spindle's hydraulic cylinder is similarly driven up and out of the machine.
Other features include air/oil lubrication for the machines' driven tooling gear train and ball screws, which reduce heat generation, while X and Y servos have their own cooling fans.
Angular contact spindle bearings further reduce thermal effects.
Finally, all sub-spindle models supplied in the UK will have 15kW (134Nm) motors, which allows heavy-duty turning on second operation work.
The new range of 36 machines replaces the existing Puma 1600, 2000, 2500, 240, 280 and 300 ranges - a total of 40 machines - and eliminates the model overlap that previously existed.
The range consists of three machine series - 2100, 2600 and 3100.
The Puma 2100 (8in/65mm bar) has two bed lengths - 520 and 760mm - and there are six models for each bed length: 2100 - plain turning; 2100M - with driven tooling; 2100S - with sub-spindle; 2100MS - with sub-spindle and driven tools; 2100Y - with driven tools and Y-axis; and 2100SY - with driven tools, Y-axis and sub-spindle.
This represents an extension of the technical options available over previous generations.
The Puma 2600 (10in/76mm bar) again has two bed lengths - 750 and 1,250mm - and the same six model types in each.
The Puma 3100, a true 12in chuck machine (102mm bar), has four bed lengths - 750, 1,250, 2,000 and 3,000mm - and three models in each length; there are no sub-spindle variations for this large-capacity machine.
The Puma 3100 can also support a 15in chuck.
All new Pumas have the option of being supplied with belt-driven or built-in motor spindles - except for the Puma 3100 series, which is belt-driven only.
Sub-spindles can be belt-driven or built-in, and tailstocks can be tow-along or servo-driven.
The tool turret is common across all new Pumas features 12 positions, but has the ability to half index such that, with special tool holders, two tools can be fitted within a single station.
In the case of end-working tools on machines with Y-axes, there is the possibility to have three tools located at a single station.
The new Pumas are equipped with Fanuc CNC systems, but there are special Doosan elements included.
One feature is the automatic compensation for inertia when interpolating C-axis with others to generate surfaces, which takes account of the different characteristics associated with parts of different weight.
Tool-load monitoring is provided, allowing thresholds for tools to be set during an initial cycle.
There's also a CNC feature that allows for the logging of different operators' performances, while maintenance-support information has also been enhanced.
A utility to help users recover from turret malfunctions is another offering, while an on-screen calculator is yet another addition.
The machine light turns off if the operator panel is not touched for a prescribed length of time, and the machine goes into sleep mode if idle and the operator panel has not been touched for a set length of time.
Trouble-free maintenance has also been given attention, with, for example, sub-spindle alignment made simple through easily accessible adjustment screws.
Access to the sub-spindle itself is also straightforward and the coolant tank can be removed from the front of the machine without the requirement to remove the chip conveyor.
http://www.manufacturingtalk.com/news/mil/mil205.html
The machine structure of the new Pumas has benefited from the application of Finite Element Analysis (FEA) to determine static and dynamic stiffness, leading to a more stable, better damped structure for increased accuracy.
Another key feature is that the range is modular, seeing the use of common parts across all models.
This has helped keep costs down and means that, despite a significant improvement in technology and performance, the Puma lathes don't cost much more than the older models they have replaced.
The new Pumas' machine base casting has been increased by up to 158 per cent; their box guideways have been made 50 per cent thicker; and the saddle width along the Z-axis has been increased, as has the distance between Z-axis slideways.
Other design-and-build mechanical improvements have seen the mounting area for the headstock being increased by 90 per cent and the mounting area for the sub-spindle increased by 50 per cent, increasing overall rigidity.
In addition to these improvements, the effect of heat-generating elements has also been considered.
So, the heat generated by the hydraulic power pack is directed away from the machine and hot air is driven upwards out of the control cabinet with a heat wall between it and the machine.
Heat from the main spindle's hydraulic cylinder is similarly driven up and out of the machine.
Other features include air/oil lubrication for the machines' driven tooling gear train and ball screws, which reduce heat generation, while X and Y servos have their own cooling fans.
Angular contact spindle bearings further reduce thermal effects.
Finally, all sub-spindle models supplied in the UK will have 15kW (134Nm) motors, which allows heavy-duty turning on second operation work.
The new range of 36 machines replaces the existing Puma 1600, 2000, 2500, 240, 280 and 300 ranges - a total of 40 machines - and eliminates the model overlap that previously existed.
The range consists of three machine series - 2100, 2600 and 3100.
The Puma 2100 (8in/65mm bar) has two bed lengths - 520 and 760mm - and there are six models for each bed length: 2100 - plain turning; 2100M - with driven tooling; 2100S - with sub-spindle; 2100MS - with sub-spindle and driven tools; 2100Y - with driven tools and Y-axis; and 2100SY - with driven tools, Y-axis and sub-spindle.
This represents an extension of the technical options available over previous generations.
The Puma 2600 (10in/76mm bar) again has two bed lengths - 750 and 1,250mm - and the same six model types in each.
The Puma 3100, a true 12in chuck machine (102mm bar), has four bed lengths - 750, 1,250, 2,000 and 3,000mm - and three models in each length; there are no sub-spindle variations for this large-capacity machine.
The Puma 3100 can also support a 15in chuck.
All new Pumas have the option of being supplied with belt-driven or built-in motor spindles - except for the Puma 3100 series, which is belt-driven only.
Sub-spindles can be belt-driven or built-in, and tailstocks can be tow-along or servo-driven.
The tool turret is common across all new Pumas features 12 positions, but has the ability to half index such that, with special tool holders, two tools can be fitted within a single station.
In the case of end-working tools on machines with Y-axes, there is the possibility to have three tools located at a single station.
The new Pumas are equipped with Fanuc CNC systems, but there are special Doosan elements included.
One feature is the automatic compensation for inertia when interpolating C-axis with others to generate surfaces, which takes account of the different characteristics associated with parts of different weight.
Tool-load monitoring is provided, allowing thresholds for tools to be set during an initial cycle.
There's also a CNC feature that allows for the logging of different operators' performances, while maintenance-support information has also been enhanced.
A utility to help users recover from turret malfunctions is another offering, while an on-screen calculator is yet another addition.
The machine light turns off if the operator panel is not touched for a prescribed length of time, and the machine goes into sleep mode if idle and the operator panel has not been touched for a set length of time.
Trouble-free maintenance has also been given attention, with, for example, sub-spindle alignment made simple through easily accessible adjustment screws.
Access to the sub-spindle itself is also straightforward and the coolant tank can be removed from the front of the machine without the requirement to remove the chip conveyor.
http://www.manufacturingtalk.com/news/mil/mil205.html
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