The Kellenberger Kel-Varia is a CNC controlled, universal cylindrical grinding machines with a direct-drive workhead for grinding of large, heavy parts.
"The torque drive allows heavy parts to be accelerated and braked with zero backlash during bidirectional movements," said a company spokesperson. "A variety of parts and geometries can be processed using combinations of cylindrical grinding, OD and ID out-of-round grinding, thread grinding and jig grinding in one set-up. Advanced C-axis (ultra-high resolution) operation allows precise grinding of grooves and satellite and centering bores."
The direct-drive workhead has an infinitely variable spindle speed from 1 to 500 RPM (with Heidenhain control) with a maximum weight capacity of 750 Nm / 300 kg (660 lbs) with an option of ±60 second micro-correction for easier adjustment of cylindricity. For between center work, a Morse taper 4 tailstock with nitride-coated sleeve runs in ball-bush bearings designed to achieve high rates of in-feed even with heavy parts. A sleeve retraction of up to 50 mm is pneumatically or hydraulically operated. Maximum weight is 250 kg / 550 lbs between centers.
The C-axis option of interpolating the X and C axes make it possible to use the cylindrical grinding machine for non-round shapes such as polygons, free contours and eccentric forms. The rotary encoder with a resolution of 0.00001° is installed directly on the workhead spindle. All standard grinding cycles work on cylindrical and non-round grinding as well, including the handwheel release for the X-axis. The motors and control system (Heidenhain GRINDplus) are designed to provide non-round and thread grinding operations. Jig grinding capability offers a complete part in one set-up.
The swiveling hydrostatic, direct-drive B-axis provides simultaneous interpolation of the X, Z and B axes with programming resulting in a resolution of 0.00002. This CNC controlled B-axis allows complete grinding of traditional and complex parts in a single set-up. A patented Kel-Set wheel-measuring device (option) determines the wheel edge (vector) to automatically calculate its angular position.
Kellenberger offers 28+ wheelhead configurations to choose from with multiple grinding wheels for external, face and internal grinding. Additionally, the use of two internal grinding spindles and the option of thread grinding or non-round grinding can be performed. A universal wheelhead can be configured with up to four tools. Diagonal wheelheads provide the option of rough and finish grinding in one set-up. The additional use of high-frequency ID grinding spindles will allow universal OD, face and ID grinding. Tandem-type wheelheads are designed for the possibility of carrying out straight and angular in-feed operations in the same setup. With an additional high-force internal grinding spindle it is possible to process internal grinding work using a tandem-type wheelhead.
Measuring system options include Movomatic or Marposs active and passive longitudinal positioning and in-process gauging, KEL-TOUCH gap control and KEL-BALANCE automatic wheel balancing for precision part processing.
"Precision hydrostatic guideways provide frictionless grinding and maintain accuracy," said a company spokesperson. "The hydrostatic guides include longitudinal slide movement (Z-axis), wheelslide in-feed (X-axis) and swiveling B-axis. Benefits include shorter spark out times and zero backlash during bi-directional movement for reduced total grinding time, less wear on CBN or diamond grinding wheels and improved surface finish. There is no stick-slip effect. Even the smallest increments of 0.1 micron can be traveled without a problem. Kellenberger provides a five-year warranty on the hydrostatic guideways. The precision hydrostatic guideways in combination with the direct-drive workhead technology provide high accuracy in concentricity and radial run-out: part roundness of <0.2 micron; non-round contour accuracy of <6 micron; internal eccentric bore of <4 micron; straightness (slots) of <2 micron."
Kel-Varia cylindrical grinding machines are available in three sizes, with distance between centers of 600, 1000 and 1,500 mm with center heights of 175, 225 and 250 mm, respectively.
For more information contact:
Hardinge Inc.
P.O. Box 1507
Elmira, NY 14902-1507
800-843-8801
info@hardinge.com
www.hardinge.com
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