Hemburg microturn 20 slantbed High precision turning machine

Finish hardturning Diamond turning High precision turning Unique design The name Mikroturn refers to a generation of highly sophisticated ultra-precision lathes. The Slantbed-Mikroturn κ 50 CNC is a breakthrough in modern design of oil hydrostatic turning machines in the micron-inch resolution range. The Mikroturn lathes employ the latest technology and Hembrug know-how in extremely fine turning.

Mikroturn 50 CNC Features - П hydrostatic main spindle, run-out s μm hydrostatic slides, repeatability 0,1 μm natural granite base with an integrated vibration damping system Siemens CNC control resolution μm micron-inch heat vibration generating peripherals are isolated from the machine linear scales - C. linear motor technology optional T-construction separately mounted X-slide Z-slide with main spindle configuration Hydrostatic bearings and guideway excellent running accuracy superb damping properties high stiffness, independent of speed no wear, everlasting high accuracy zero-friction, no stick-slip good thermal stability no need for additional lubrication improved tool life

Natural granite machine good damping properties high thermal stability high static dynamic stiffness free of stress corrosion-free, non-magnetic

Hydrostatic main spindle The main spindle is supported by two hydrostatic bearings, one combined axial/radial front bearing and one radial bearing, giving an excellent free-of-wear spindle run better than μm. The hydrostatic bearings have air labyrinth sealing rings to prevent dust from penetrating the bearings from the outside and hydraulic oil leakage from the bearings from the inside. The main spindle, with standardized spindle nose, provides the possibility of using various workholding devices such as pneumatic collets or 3-jaw chucks, electric permanent magnetic chucks, vacuum chucks, or other clamping fixtures. Depending on the application and workpiece range, hydrostatic main spindle versions are available up to 6,000 rpm or 10,000 rpm. The direct drive has C-axis control with resolution/accuracy and is driven by a brushless kW motor.

Hydrostatic X-Z slides Both slides are supported by hydrostatic, free-of-wear flat guideways, giving zero friction construction and extremely accurate repeatability of μm. The slides are controlled by brushless motors with precision ball screws and equipped with air-sealed precision scales. The Z-slide contains the main spindle, and the X-slide is carrying the tool changer. This results in a low construction lower than with stacked slides and provides extra stability.

CNC control, resolution μm The CNC system consists of a modern control with a resolution of μm and a digital interface for drives, main spindle slide AC-motors. The CNC control easily reflects oscilloscope functions and graphics on the screen. The digital drive package, in combination with μm resolution, gives a high dynamic response. This results in a very low circle-to-circle error and excellent step response for an improved surface finish during linear and circular interpolation.

Mikroturn 50 CNC Values for dimensional accuracy 1T 0-3 μm, geometrical accuracies s μm, and for Ra = μm hydrostatic main spindle results Slantbed-Mikroturn 50 CNC Finish hardturning replaces High precision turning machines are for the fine processing of automotive parts, bearing grinding Apart from hardened steel and non-ferrous materials, the Slantbed-Mikroturn 50 CNC can be successfully used for high precision machining of materials such as stainless steel, cast iron, plastics, graphite, green ceramics, etc. Achieved experience values: dimensional accuracy 1T 3-5 2 μm, form accuracy s in and surface finish N 3-9 Ra = μm.

Hembrug Finish hardturning The Slantbed-Mikroturn 50 CNC is specially developed for finish hardturning of precision steel workpieces having hardness of HRC 50-70. Finish hardturning is a technology, replacing time-consuming and costly grinding operations. For finish hardturning, the Mikroturns are tooled with advanced cutting tools, such as CBN, mixed ceramics, and Cermets. Mikroturn lathes are in use for fine machining of automotive parts, bearing rings, tools, injection molds, hydraulic valves, ballscrew nuts, etc. Values for dimensional accuracy 1T 3-5 2 μm, geometrical accuracies s μm, and for surface finish N 3-9 Ra = μm have been obtained.

Hembrug Hard turning versus Grinding versus hard turning Comparison of machining processes for tungsten carbide punches Conventional machining

Rough grinding of the face: 8 min

Grinding of the contour: 45 min

Polishing: 30 min Total time for the production of the contour on the face of 10 parts amounts to 38 hours Finish hard turning

Rough turning of the face: 10 min

Machining of the contour: 10 min

Polishing: 3 min Total time for the production of the contour on the face of 10 parts amounts to 23 hours

Acceptance test results on 250 hardened steel high-pressure diesel pump parts

Material: hardened steel, 650-750 HV

Dimensions: 

Clamping: Precision 3-jaw chuck, air-operated

Cutting tool: CBN, with tool nose radius

Cutting technology: Cutting speed Vc = 160 m/min, feed f = mm/rev, depth of cut Ap = mm Finish hard turning results:

Roundness: μm

Straightness: μm

Cylindricity: pm

Ra 

Bearing ratio > 950

Acceptance test results on 375 hardened steel planetary wheel parts

Material: 20 MnCr 5, HRc 60

Dimensions: mm

Clamping: Precision 3-jaw chuck, air-operated

Cutting tool: CBN, with tool nose radius and wiper

Cutting technology: Cutting speed Vc = 160 m/min, feed f = mm/rev, depth of cut Ap = mm Finish hard turning results:

Roundness: 1 μm

Straightness:

Cylindricity: 3 μm

Ra 0.15

Slantbed-Mikroturn 50 CNC Technical data:

x-axis/z-axis: 

Max. workpiece diameter for chucking applications: 

Hydrostatic main spindle, speeds 

Main drive power:

Spindle run-out: 

Hydrostatic longitudinal and cross slides, repeatability: 

Rapid traverse at μm resolution: 

32-bit CNC system, resolution: 

Tooling system: 8 or 12 pos. tool turret or linear tooling

Options include air spindle, precision chucks, vacuum clamping, magnetic clamping device, tool turret, driven and non-driven tools, linear tooling, tool measurement, workpiece measurement, automatic door, automatic part handling system, spray mist installation, chip conveyor, grinding spindle, and linear motors.