Burri BZ331 CNC Gear Grinding Machine

Description

Gear grinding machine BZ 331
Machine BZ331 Basis RZ301/AZA
Scope of supply:
The machine will be equipped with a completely new PC control unit with high performance Ethernet network, compact I/O system, modular drives with energy recovery system, digital absolute precise encoders, CNC control on all axes, high-dynamic synchronization module, dialogue-based user interface, remote diagnosis system (internet access on the machine to be provided by the customer), data management via Compact Flash, USB interface, etc. The electrical cabinet is fixed to the machine - also during transport of the machine.

Technical data:

Workpiece:

• Workpiece Ø: 10 – 330 mm
• Module: 1 – 7,0 mm
• Number of teeth: 6 – 999
• Helix angle: ± 45°
• Workpiece length: 600 mm from table to tailstock depending on clamping tool
• Work slide travel (grinding pass) max.: 210 mm
• Work piece weight: max. 60 kg

Grinding wheel:

• Grinding wheel Ø: 250 – 350 mm
• Width of grinding wheel: 104 mm
• Speed of grinding wheel: 63 m/sec.
• Number of starts: 1 - 5

Performance data / Scope of work:

• Hydraulic power clamping for different clamping systems
• Oil mist separator
• Balancing system
• Automatic door-operation at the end of a cycle
• All axes with CNC control
• Cutting speed 63 m/s (3.500 rpm – before: 1.900 rpm)
• Multi-start grinding (up to 5-starts depending on module - originally only 1- start was possible)
• Speed of work piece drive 750 rpm (before: max. 300 rpm) including oil centrifuge functions adjustable at the end of the cycle
• Max. gear diameter 330 mm
• Large data memory for several hundred gears
• Min. wheel root diameter reduced from 280 to 250 mm. Thus you will have approx. 30 % additional grinding wheel material.
• Automatic adjustment of the centering sensor by the machine software (operator no longer needs to make adjustments)
• Automatic set up of profiling/grinding by acoustic touch control
• With the new B & R control unit the machine has a very quick set-up time and is very flexible and thus it is suitable for small and large batch production.
• The ultra-modern B & R Acopos Multi driving concept and the compact hydraulic has reduced the power consumption of the machine to approx. 1/3.
• Compressed air quality: ISO 8573-1:2010 Klasse (7:4:4)

Basic equipment delivered with the machine:

• Operating tools
• Levelling pads
• Fixed tailstock center MK3
• Backup of machine (on CF-card)
• Documentation (including CE-Certificate, VDE certificate, operator/programming manual, maintenance documents, vendor documents, assembly drawings, electrical diagram,
hydraulic, pneumatic, cooling, lubrication plans) (2 x printed / 1 x soft copy on CD)

Grinding support: The scraped guideways are replaced by hardened linear guides.
The grinding support will receive a synchronous motor which is directly connected to the grinding spindle and adjustable from 0 to 3.500 rpm
(corresponds to a cutting speed of 63 m/sec). It will also be equipped with a completely new profiling slide with ball bearing spindle,
linear ball guides and linear measuring system. The profiling cycle can happen in both directions (forwards/backwards). The wheel guard has
integrated meshing probes and transmitter for balancing head. Short cone grinding spindle (same as with RZ 362/RZS) including balancing unit
with integrated acoustic touch control system for full automatic set-up of the dressing (profiling) and grinding cycle.
Grinding wheel dimensions 350 x 104 x 160 mm.

With the above-mentioned changes, all components of the machine that were liable to become maintenance problems are eliminated, such as electric clutches, indexing plunger, lead screw of the dressing slide with all change gears, etc.Work piece support with Z-axis: The new Z slide is modified from hydraulic to servo drive with linear guides, ball bearing spindle and linear measuring system. The new work piece spindle (machine table) is a direct drive with water-cooled Torque motor; thus, the machine can now handle multi-start processing of small, helical gears. The max. speed has almost doubled from 300 rpm to 750 rpm. The machine can be operated with a collet system with 30/65 mm ball diameter and also with integrated clamping systems. With the above-mentioned changes all mechanically sensitive components such as crown gear, backlash compensation, oil ring, scraped guides etc. are dropped.