JUSTAR - Cutting tool grinding machines

Complete grinding of a comprehensive tool spectrum

The JUSTAR grinding center is a dream come true: The production of wide-ranging cutting tools in HSS and carbide with just one machine. This is made possible by the JUSTAR's fully automatic grinding wheel changer, with up to 30 grinding wheel mounting interfaces. This ingenious technology allows the machine to grind finished tools from round bar stock – in a single clamping set-up.

Highlights

Automatic dimensional correction
Robot-operated coolant nozzle tracking
Grinding wheel changer (with up to 30 grinding wheels)
Stable machine bed

Grinding process descriptions

The JUSTAR Grinding Center is the perfect machine for complete processing of an extensive range of workpieces. It offers maximum flexibility with top productivity and practice-oriented programming. A high-performance grinding spindle ensures high-speed cutting, and is supported by robot-operated cooling nozzle tracking. Thanks to a measurement system featuring automatic dimensional correction, only acceptable parts leave the machine.

Carbide tap: M8, total length 91 mm, thread length 25 mm from round carbide bar (dia. 8.5 mm, length 330 mm)
Cycle time: < 20 min
Grinding task:
1. Solid tip (external centering for tailstock mounting)
2. Steady seat
3. Measurement seat
4. Contour
5. Square section
6. Chamfer on square section
7. Four flutes
8. Peeling chamfer
9. Chamfer
10. Thread
11. Workpiece cutting

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JUSTAR

Technical data: JUSTAR

Grinding Length: 35-430 mm
Clamping Length: 35-430 mm
Grinding Wheel Diameter: 70-250 mm

Equipment and Options

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.
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.
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.
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.
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