Clamping devices, lubrification and filtration for titanium drills with through shaft cooling

General information

In the industry for metal work tools, shorter processing times are always in demand. At the same time, the requirements to the manufacturing precision and process reliability are growing. To fulfill these requirements, the "machine tool (all types of drilling machines) – spindle – tool – tool holder" system must be perfectly adjusted.

The following requirements have to be taken into account:

  • For the machine tool: High level of stiffness, vibration isolation of the foundations, lightweight design of the moving parts, high concentricity accuracy of the spindle, pull-in forces of the machine spindle, intelligent and quick machine controls
  • For the tool holder: High concentricity and balanced, friction-locked tightening of the tool
  • For the tool: High concentricity, excellent balance quality (geometry and shank design), long tool life (tool material, geometry, coating)

Tool Holders

Hydraulic expansion tool holder

These ensure the high concentricity during drilling.

MikronTool-products-Additional-Tech-Specs-Tool-Holders-Hydraulic

Characteristics:

  • Concentricity: 0.003 mm (.00012”) (measuring point at 2.5 x D)
  • Max. speed: 50'000 rpm / balance rate (G 2.5 / 25000 1/min)
  • Precise concentric clamping
  • High torque transmission
  • Maintenance-free (closed system)
  • No wear in the clamping diameter
  • Longer (up to 4 times) tool life
  • Adjustable clamping force
  • Short tool change time (without additional devices such as, shrink fit device)

Application:

  • High-precision clamping of tools with cylindrical shaft
  • Universal tool holder for drilling and milling (roughing and finishing). Advantageous in the case of HSC processing (milling, for example on a small CNC milling machine) due to its shock-absorbing.

Shrink fit tool holder - shrink fit tool holder according to DIN 69871 

These guarantee highest concentricity with secure friction-fit connection and form an optimal connection between the tool and the holder.

MikronTool-products-Additional-Tech-Specs-Tool-Holders-Shrink-Fit

Characteristics:

  • Concentricity: ≤ 0.003 mm (.00012”)
  • Max. speed: 40'000 rpm
  • Absolutely secure friction-fit force transmission
  • Adequate for shaft diameter of 4 mm (.157”) (3 mm (.118”) are conditionally possible).
  • Transmittable torque 2 to 4 times higher compared to the hydraulic-tool holder and the high precision collet tool holder.
  • Average tool change time (shrink fit device is necessary)
  • Suitable for machining in narrow spaces and interfacing edges due to the small overall construction size and longer versions

Application:

  • Optimal for HSC machining, in particular also for smallest drill bits
  • For milling and drilling tools with cylindrical shaft

Collet tool holder systems (ER collet chucks) according to DIN 6499-A / optimized precision collets

These guarantee highest concentricity.

MikronTool-products-Additional-Tech-Specs-Tool-Holders-ER-Collect

Characteristics:

  • Concentricity: 0.003 mm (.00012”) possible
  • Max. speed: 40'000 rpm
  • Average tool change time (a torque wrench is necessary)

Application:

  • Clamping of tools with a cylindrical shaft in high precision collet according to DIN 6499
  • Universal tool holder for milling (roughing and finishing) and drilling.

Balance quality

The balance quality of the collet tool holder is specially critical in high speed machining processes. The best possible balance quality guarantees not only reduced vibrations of the tool but increases tool life, improves surface quality and above all, protects the spindle bearings.

Types of drilling machines

CrazyDrill Titanium TN/TK can be used on all types of drilling machines, CNC machining centers, automatic lathes or transfer machines.

  • Minimum speed 10,000 rpm (drill size diameter 1 mm / .039“)
  • Minimum speed   3,000 rpm (drill size diameter 3 mm / .118“)
  • Minimum concentricity of spindle 5 µm (.00019“)

Coolant type / Filtration / Pressure

For best results, Mikron Tool recommends the use of 8% emulsion with EP-Additives (Extreme-Pressure-Additives) as coolant fluid. 
Alternatively, cutting oil can be used with good results as well.

Filter: The large cooling channels allow a standard filter with a filter quality of ≤ 0.05 mm.
For tools with external cooling, no special parameters need to be taken into account for the filter. However, it must be ensured that the coolant is fed directly to the drill tip and thus cools and lubricates the drill perfectly and flushes away the chips.

Chart for coolant pressure
To ensure a reliable drilling process of tools with through shaft cooling, the following minimum pressures are required (see chart).

A higher coolant pressure is required for smaller hole diameters.
A higher pressure is generally better for the cooling and flushing effect