DRILLMAT - Cutting tool grinding machines

Twist drill grinding

A sharp cutting edge, precise concentricity, a long service life - twist drills for professional use must be manufactured to an exemplary standard without neglecting the cost aspect. This is achieved by DRILLMAT, which grinds from blanks made of HSS in a single clamping set-up to produce a finished twist drill. The grinding wheel package ensures a perfect ground finish for twist drills with even the most complex cutting edge geometry. Integrated loading and unloading systems reduce downtimes.

Highlights

Face grinding prior to back grinding
11/20 kW grinding spindle
Rapid retooling
CNC dressing unit

Grinding process descriptions

The DRILLMAT grinds flutes, the face geometry and the back in a single clamping set-up. Stable bushing support ensures the necessary rigidity during grinding operations, thus enabling maximum precision. Up to four corundum grinding wheels are mounted on the grinding spindle. With the DRILLMAT S, dressing is possible simultaneously with the grinding and loading sequence. The cooling nozzle system can be individually controlled with 4 channels for each grinding process.

HSS twist drill: dia. 5 mm, total length 86 mm, flute length 52 mm, two flutes, Runout< 0.002 mm
Cycle time: < 49 s
Grinding task: Complete grinding

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Technical data: DRILLMAT L

Grinding Length: 420 mm
Clamping Length: 500 mm
Grinding Wheel Diameter: 250-175 mm

Technical data: DRILLMAT S

Grinding Length: 470 mm
Clamping Length: 550 mm
Grinding Wheel Diameter: 200-120 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.
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.
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.
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.
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.
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