Lean Selection cam - Non-cylindrical grinding machines

Economical and precise camshaft grinding

The Lean Selection cam is an economical and flexible machine concept for grinding camshafts in any lot size. The wheelhead can be fitted with up to two high-capacity grinding spindles, and the swiveling B-axis allows parts to be rough and finish-ground in a single clamping set-up. The Lean Selection cam CBN non-cylindrical grinding machine features userfriendly controls, minimal processing times and a high rate of availability.

Highlights

Grinding with CBN grinding wheels
Circumferential speed of 140 m/s
Wheelhead with up to two high-capacity grinding spindles
Fast changeovers
High rate of availability
Minimal auxiliary times
Easy to operate
Wide range of services

Grinding process descriptions

Efficient camshaft production

Performs rough and finish grinding in a single clamping set-up, which saves time and increases accuracy

Design targeted for noncircular grinding, significantly boosting productivity

High rate of utilization with CBN abrasive and oil coolant (emulsion optional)

Proven CBN grinding technology with cutting speeds up to 140 m/s and high feed rates, resulting in fast cycle times

JUNKER 3-point mounting interface for fast changeover and excellent grinding wheel concentricity

High-frequency, high performance grinding spindle (42 kW drive capacity) with extremely low-maintenance thanks to lifetime lubrication and air seal

Ergonomical machine concept with the option of manual loading

Sophisticated, high-tech, user-friendly CNC controls

: JUNKER standard bore guarantees maximal accuracy and extremely fast tooling times

The JUNKER standard bore is featured on the wheelhead and workhead and reduces the machine‘s tooling times.

Fast changeover and tooling times (under 2 min. for centers, under 20 min. for grinding wheels)

Easy to mount

Optimal centering

Axially mounted with screwed-on grinding wheel flange, allowing changeover in rotational direction

Concentricity 2/1000 mm

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Lean Selection cam

Technical data: Lean Selection cam

Grinding Length: 500 mm
Clamping Length: 500 mm
Center Height: 150 mm
Component Weight: 15 kg
WxDxH mm (without peripherals): 3340 x 2660 x 2325
Weight: 12000 kg

Equipment and Options

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.
ABRASIVE: Depending on the application, the abrasive CBN or diamond is used. The basic bodies of the grinding wheels comprise steel or carbon. In conjunction with CBN, it can make sense to use a carbon base body: It is light, has vibration-damping properties and remains dimensionally stable even at high speeds.
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.
MEARSUREMENT 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 measuring system to determine the diameter, axial position and width of the grinding wheel completes the wide range of systems on offer.
DRESSING UNIT: Grinding wheel dressing is CNC controlled. A driven diamond dressing wheel or a workpiece-dependent diamond profile roller can be used. Dressing takes place manually or using an automatic dressing program with grinding wheel compensation.
MACHINE BED: The machine bed made of mineral cast provides impressive damping behavior and torsional rigidity. The temperature stability allows fluctuations in the ambient temperature to be compensated with a minimum of effort, ensuring a high level of dimensional stability throughout the whole day.
FIRE PROTECTION AND LTA AIR FILTERS: In case of an fire, the machine interior is automatically hermetically sealed, suffocating a fire before it has a chance to spread. If required, extinguishers (CO² or water mist systems) and exhaust air purification systems can be additionally installed. A competent partner for fire protection and filtration solution solutions is LTA Lufttechnik GmbH, which also belongs to the JUNKER Group and which researches, develops and produces filtration systems for industrial air purification.

The Filtration systems
STEADIES: As an option, self-centering three-point steadies ensure stable support. Tracking hydraulic jaws guarantee a balanced ratio of forces at all three support points, and with it a grinding process with repeat accuracy.