MenuTransfer-MachineGemeinschaftsprojekt "Multispin" Rundtaktmaschine WMW
Description
Research - Development - Prototyping
In our joint project with the Fraunhofer Institute, we have developed a new, more powerful spindle drive for rotary transfer machines for machining stainless steels!
The project was supported by the Sächsische Aufbaubank (SAB) with funds from the European Regional Development Fund (ERDF).
planned publications:
Metav Düsseldorf 2022
Intec Leipzig 2023
Development status:
Machine and processing units have been put into operation.
The testing of the technology is being prepared.
Compared to the Gnutti units, the new machining units have the following
design advantages:
- 1 type of machining unit instead of 2 types (drilling, tapping)
- coaxial direct drives for spindle and Z axis (innovation)
- 7 times higher spindle power (from 2.98 kW to 21 kW)
- 6 times higher speed (from 1005 min-1 to 6000 min-1)
- 1.3-fold increase in volume (from 52.2 dm³ to 67.6 dm³)
- 5.4-fold higher power density (7 / 1.3 = 5.4)
and technological advantages:
- higher torques and forces for machining stainless steel instead of brass
- freely programmable S-speed, Z-feed via CNC program
- synchronization of a spindle and feed movement via cycles
- synchronization of the 6 machining units via 6 NC channels
- water cooling of motor spindles reduces heat input into workpiece
- Internal tool cooling through spindle shaft increases tool life
- HSK tool clamping reduces service times
- No retooling of the thread copying gear in case of changed workpiece geometry
Details
Technical data
Main dimensions:
Total mass: approx. 6500 kg
length: approx. 5900 mm
width: approx. 3800 mm
height: approx. 2200 mm
Workpiece specifications:
max. workpiece length 120 mm
min. workpiece length 20 mm
max. workpiece diameter 65 mm
min. workpiece diameter 15 mm
max. workpiece thickness 10 mm
min. workpiece thickness 2 mm
Material stainless steel
Data of the plant:
Plant capacity 10 pieces / min
number of spindles 6
max. traverse range Z-axes 125 mm
type tool holder HSK80/HSK100
max. tool diameter 60 mm
min. tool diameter 3 mm
max. tool length 250 mm
min. tool length 20 mm
Drilling: up to diameter 20mm
Boring: up to diamter 88mm
Thread cutting: up to diamter 85mm
Facing and Centering : up to 100mm
Electrical data
voltage 220/400 V
power 200 kW
CNC control SINUMERIK 840D sl
Manufacturer Siemens
Control voltage 24V/DC
Spindle Type HBE21-125E:
The high efficiency machining unit MultiSpin HBE 21 – 125 E developed by WMW AG in cooperation with the Fraunhofer IWU (Institute for Machine Tools and Forming Technology) is the result of years of experience and research. Advantages are:
capable of continuous operation in 3-shift system due to the innovative coolant systems
higher safety for man and machine thanks to integrated safety functions in the drive train and the control system sealing air protects spindle bearings and glass scales from any dirt and coolant
less wear due to the coaxial feed motor and spindle
Technical data: Hollow shaft motor with DRIVE-CLiQ from Siemens
Power: 21 kW
Torque: max. 210 Nm Power density: 310,45 kW/cm
Feed rate: 6 m/min
Feed length: max. 125 mm Rotation speed: max. 6000 U/min
Tool holder: HSK 80 or HSK 100 Internal and external cooling
Planned work
Improvements compared to the old version:
Conversion to CNC control and thus:
easy resetting (workpiece setup adjustments)
Adaptability of machining processes
simple, faster operation
Increased cutting and drilling performance
Adaptation to all common tool holders
Reduction of space and weight
up to 35% energy saving
Work performed
Compared to the Gnutti units, the new machining units have the following
design advantages:
- 1 type of machining unit instead of 2 types (drilling, tapping)
- coaxial direct drives for spindle and Z-axis (innovation)
- 7 times higher spindle power (from 2.98 kW to 21 kW)
- 6 times higher speed (from 1005 min-1 to 6000 min-1)
- 1.3-fold increase in volume (from 52.2 dm³ to 67.6 dm³)
- 5.4-fold higher power density (7 / 1.3 = 5.4)
and technological advantages:
- higher torques and forces for machining stainless steel instead of brass
- freely programmable S-speed, Z-feed via CNC program
- synchronization of a spindle and feed movement via cycles
- synchronization of the 6 machining units via 6 NC channels
- water cooling of motor spindles reduces heat input into workpiece
- Internal tool cooling through spindle shaft increases tool life
- HSK tool clamping reduces service times
- No retooling of the thread copying gear in case of changed workpiece geometry