JUCRANK - crankshaft grinding
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JUCRANK CRANKSHAFT GRINDING

PRECISE IN A SINGLE SET-UP The JUCRANK takes care of all grinding operations on crankshafts in a single clamping set-up. Whether single-stroke ultra-small or multi-stroke large-scale crankshafts – rough and finish grinding of crankshafts in all series sizes and wide-ranging geometries is possible using differently dimensioned platforms. JUNKER • JUCRAN

GRINDING PROCESS PENDULUM GRINDING The pendulum grinding method enables crankshafts to be rough and finish ground in a single clamping set-up. The crankshaft rotates around its central axis and the grinding wheel follows the circular motion of the pin bearing by interpolation of the workpiece spindle (C axis) with the grinding spindle (X axis). To achieve top concentricity quality, crankshafts are frequently supported on a steady. The rough grinding process relieves any hardening stress in the material and an in-process measuring system supplies correction data for finish grinding. AXIALLY...

HIGHEST PRECISION FOR EVERY CRANKSHAFT WORKPIECE SPECTRUM JUCRANK pendulum grinding machines take care of almost every conceivable crankshaft grinding operation. The main and pin bearing (cylindrical, concave, convex), thrust bearings as well as flanges and journals can all be ground in a single clamping set-up. Flat surfaces and radii can also be ground. The crankshaft is used wherever piston movements are converted into rotary movements. This means that there is a significant variation in size. Crankshafts ground using JUCRANK are used in applications such as: • Vehicles • Pneumatic and...

HIGHLIGHTS AND SPECIAL SOLUTIONS HIGHLIGHTS • High process reliability due to complete grinding in a single set-up • Optimum grinding quality due to automatic compensation of disturbance variables • High dimensional stability due to in-process measuring system • Flexible use for wide-ranging different cylinder numbers by CNC resetting • Extreme smooth running due to directly driven grinding and work piece spindles • Optimum support provided with self centering three point steady rests LARGE CRANKSHAFTS The JUCRANK 8 grinds crankshafts with a peripheral diameter of 470 mm and a clamping...

EQUIPMENT AND OPTIONS LEARNING FUNCTION The JUCRANK's control system comes with automatic compensation of runout and disturbing variables such as temperature influences, grinding allowance fluctuations or material changes. Even minimal deviations between the target and actual position of the grinding wheel are automatically corrected. STEADIES The self-centering three-point steadies ensure centric support even in the event of different workpiece diameters. Tracking hydraulic jaws guarantee a balanced ratio of forces at all three support points. CNC controlled steadies are optionally...

CONTROL SYSTEM The Erwin Junker Operator Panel was specifically developed to control grinding machines. All machine components are controlled using the operator panel – irrespective of the series and the used control system. The identical structure, intuitive menu guidance and visualization of the workpiece geometry make for extreme user convenience and flexibility in operation. Programming takes place directly using the operator panel or an external programming tool. AXIS DRIVE AND GUIDANCE With platforms 1 to 8, the wheelheads traverse along the Z axis. The mechanical direct drive uses...

LOADING SYSTEMS JUNKER offers both internal and external loading systems for all its machine series, depending on customer and workpiece requirements. The loading systems can be combined with different infeed and discharge systems such as conveyor belts or custom tailored systems. MEASUREMENT SYSTEMS The measurement systems are also individually adjusted to the various workpieces and customer specifications. The measurement processes entail evaluating the recorded measured values and utilizing them for measurement correction in line with the prepared measurement strategy. A grinding wheel...

FIELDS OF COMPETENCE TECHNOLOGY CENTERS The JUNKER Technology Centers in Nordrach, Germany and in Holice, Czech Republic offer a wide selection of grinding machines for demonstrations and customer-specific grinding tests. These facilities give potential buyers and customers the chance to be impressed by the technical and economic performance of JUNKER and ZEMA grinding machines and test them on their own workpieces. SERVICE The company group‘s growing sales and servicing network ensures satisfied customers worldwide. JUNKER Premium Service acts swiftly and with outstanding expertise...

TECHNICAL DATA Available wheelhead versions Grinding length Clamping length Center height Workpiece weight Grinding wheel diameter (max.) Peripheral diameter

JUCRANK • JUNKER

EUROPE Erwin Junker Maschinenfabrik GmbH Junkerstraße 2 77787 Nordrach Germany Erwin Junker Grinding Technology a.s. Plant Holice Pardubická 332 534 13 Holice Czech Republic Erwin Junker Grinding Technology a.s. Russia Branch Office Prospekt Tolbukhina 17/65 150000 Yaroslavl Russian Federation Erwin Junker de Mexico, S. de R.L. de C.V. Blvd. Bernardo Quintana #7001 Torre 2, #1203 Centro Sur Querétaro Qro., C.P. 76079 Mexico Erwin Junker Máquinas Ltda. Centro Administrativo Rio Negro Edifício Jaçari - Bloco A 13° andar cj. 132/133 Alameda Rio Negro 585 CEP 06454-000 Alphaville – Barueri, São...