RK International Machine Tools partners will be well-represented at the forthcoming EMO Hanover 2017, Germany (18 – 23 September), with grinding machines on display from Perfect, Robbi, Delta, Jainnher and large capacity CNC milling machines from RK International’s most recent partnership with Lagun.
Grinding machine specialist Perfect (Hall 11, Stand A20) will be exhibiting the Perfect X36 surface grinder, which now benefits from an upgraded PLC control system, which allows axial-controlled functions to be selected according to different grinding conditions and other features that will further enhance the ease of use of this machine. The machine itself has a 300 x 600 mm maximum grinding area, a table loading of up to 300 kg and 500 mm between the table and spindle centreline, making it a versatile machine for a range of applications.
Perfect will also unveil its brand new PERFECT PFG-600R a rotary table surface grinder designed for the manufacture of components such as spacers, rings where concentricity is paramount, the machine features a 600 mm diameter rotary table with a speed between 10 and 120 revs/min. Both cross and vertical feeds are controlled by AC servo motors with the cross feed benefitting from a dual-driven system that operates from the centre of gravity to minimise vibration and increasing grinding rates.
Over at Delta (Hall 11, Stand A78) there will be a number of machines on display including the newly introduced Mini 7 travelling column surface grinder, the Rotax 7 fully automatic, rotary table, horizontal spindle NC grinding machine and the LC400 rotary grinder. The Mini 7 machine is the smallest of the three-machine Mini range from Delta and features a 800 x 550 mm maximum grinding area. Delta makes use of a stabilised Meehanite cast-iron structure for maximum rigidity and grinding performance, with accuracy further enhanced by use of hydrostatic support on all machine slideways that generate zero friction and eliminates wear, with finished component quality further enhanced by the elimination of stick/slip. The 7.5 kW spindle motor is a servo-ventilated type, with a Mackensen hydrodynamic bearing on the front and a pair of pre-loaded precision ball bearings on the rear. This eliminates wear, maximises durability and creates zero friction, to deliver fine surface finishes and high geometric and machining precision.
The Delta Rotax 7 is a travelling column, rotary table, type machine with a horizontal wheel axis. The travelling column, in line with all of the other machine axes, moves on pre-loaded hydrostatic bearings, a feature that ensures maximum accuracy. This design also eliminates the overhang error that is commonly found in quill-type wheelhead assemblies. Maximum grinding diameter of the Rotax 7 is 700 mm with a standard maximum grind height of 330 mm. The machine uses a similar spindle design to the Mini 7 with Mackensen hydrodynamic bearing and 7.5 kW of power available. Machine control and user interface is through the Compact Plus NC designed by Delta. The control has a number of automatic cycles built in to it, including roughing; finishing; and spark-out. Automatic wheel dressing is optimised at a specific frequency depending on the grinding operation and at the end of every cycle the axes retract to pre-selectable positions to make component access easy.
The Delta L400 rotary surface grinder is one of five machines in the range that can trace its history back to 1955 and the company’s foundation. The fundamentals of the machines remain the same, but the application of new technology has brought them bang up to date. Target areas for the use of the LV400 are typically in the precision mechanics, aerospace, automotive, household appliances, food industry, and punch and die production. While being a relatively compact machine the LC400 has a maximum grinding area of 400 mm diameter, with 205 mm distance between the table and grinding wheel face.
Robbi (Hall 11, Stand A82) will be highlighting its large capacity CNC cylindrical grinding machine range with the Omicron 3615 – Industry 4.0 Edition machine, part of its Omicron 36 series, taking pride of place on the stand. Machine control is provided by the Siemens 840D sl CNC unit, which with its Industry 4.0 configuration allows remote control and monitoring of the machine possible. The control will also create and store a database of key data from the production process useful for generating further productivity improvements over time. To demonstrate Industry 4.0 capability visitors to the stand will be able to access certain machine from their own mobile devices. A further control feature is the ability to profile grinding wheels to match production requirements.
The Omicron 3615 on show features the optional increased maximum cantilever weight of 100 kg, measured at 150 mm from workhead spindle nose, maximum grind length is 1530 mm and the centre height above the table is 180 mm (230 mm option), with a maximum between centre weight capacity of 250 kg (300 kg option). For further grinding versatility the table can be swivelled +7°/-3° and high precision crowning operations can be completed if the optional third interpolated axis and bespoke software are specified. The machine also features an internal grinding attachment with 30,0000 revs/min electro-mechanical spindle; Hydraulically operated tailstock; Automated wheel balancing; Renishaw flagging device; A direct drive headstock (C-axis); as well as a Hirth coupling on the wheelhead ( B-axis) with powered positioning.
The Omicron 36 series was developed in response to demands of customers in the medium-high production environment and, as such, each machine can be equipped with automatic measurement devices to process complex components, with the user also having the ability to optimise geometrical and working parameters in-process.
The centre of attention on the LAGUN stand (Hall 13, stand A56-A58) will be the BM bed mill series with the BM 3 the model being displayed. The BM series is available with axes travels of up to 5000 mm by 1300 mm by 2000 mm (X, Y and Z) subject to specification, with the BM 3 variant having 3000 mm in the X-axis. There is also a variant with a rotating table with a weight capacity of 6000 kg. The machine on display is controlled by the popular Heidenhain TNC530 control, will have a 24 position tool changer, 4000 revs/min, 37 kW spindle with 20 bar through spindle coolant capability.