G720F

Machining center for frame structure and chassis parts

The two-spindle machine concept of the G720F enables customers in the automotive industry to machine two parts with high precision and in parallel.

Thanks to optimized and coordinated feed drives, you benefit from high dynamics and short chip-to-chip times.

Automotive

Technical data

Working travels

1,450/1,200/1,035

in X-/Y'-/Z-axis (mm)

Speeds

80/50/100

max. in X-/Y'-/Z-axis (m/min)

Interference diameter

2x1,500

(mm)

All technical data

Chip-to-chip time t₁ according to VDI 2852 (s)

2.9

relative to a rotational speed (min^-1)

Position accuracy

0.01

in X-/Y'-/Z-axis (mm)

Table diameter

512

(mm)

Table load

2x635/2x750

with/without pallet (kg)

Total weight

35.000/45.000

without/with palletchanger (kg)

Benefits at a glance

Unhindered chip fall and optimal heat dissipation

High dynamics

Short chip-to-chip times

High manufacturing flexibility

High machining accuracy

Customer-specific options of various GROB motorized spindle versions

Outstanding design for machining with minimum quantity lubrication

Can be used as stand-alone machine or linked to other machines

Machine concept

Axis arrangement

The axis combination is based on the tried and proven G-series GROB machine concept with horizontal spindle position and guarantees free chip fall and optimized heat dissipation.

Modular structure

The modular and standardized machine components guarantee the best possible GROB product quality.

Individual automation

Available with manual or automatic front loading or automatic top loading.

Two-spindle machine

Two-spindle machine for machining two parts in parallel.

Technology down to the finest detail

Two-spindle machine

Two-spindle machine for machining two parts in parallel.

Electrical cabinet

Optimized access and simple orientation for preventive maintenance and inspection

Chip disposal

Uninterrupted part machining with chip disposal using a scraper-type conveyor

Typical machining operations

Side rail

Industry	Automotive
Material	Aluminium alloy
Motorized spindle	18,000 rpm
Power/torque	29 kW/34.6 Nm

Suspension strut dome

Industry	Automotive
Material	Aluminium alloy
Motorized spindle	18,000 rpm
Power/torque	29 kW/34.6 Nm

Battery tray

Industry	Automotive
Material	Aluminium alloy
Motorized spindle	18,000 rpm
Power/torque	29 kW/34.6 Nm

Subframe

Industry	Automotive
Material	Aluminium alloy
Motorized spindle	12,000 rpm
Power/torque	40 kW/161.4 Nm

Giga-Casting

Industry	Automotive
Material	Aluminium alloy
Motorized spindle	18,000 rpm
Power/torque	20 kW/26 Nm

Spindle versions

Besides the broad range of spindles, the motorized spindles designed and produced by GROB itself are the preferred choice for optimized process design. These are optimally matched to the G720F and have optimized quality features.

Motorized spindle versions

HSK-A63, 47 Nm, 12,000 rpm
HSK-A63, 47 Nm, 18,000 rpm
HSK-A63, 83 Nm, 12,000 rpm
HSK-A63, 86 Nm, 17,000 rpm
HSK-A100, 185.5 Nm, 12,000 rpm
HSK-A100, 340 Nm, 10,000 rpm

GROB Spindle Diagnostics (GSD)

GROB spindle diagnostics is a system that automatically monitors the condition of the motorized spindle. Benefits are a prolonged motorized spindle useful life, reduced tool wear and scheduled maintenance.

GROB Chip-in-Spindle Detection System (SiS)

This system is able to detect at an early stage tool clamping faults caused by chips between the HSK plain surface and the spindle nose from 10 μm. So the machining process is optimized and rejects and damage are avoided.

Tool magazine

Single disk-type tool magazine

Double disk-type tool magazine

Control systems

Choose between modern and powerful CNC control systems from market leaders for the G720F.

Automation solutions

Loading systems

The G720F is designed for efficient work area loading. All loading devices are developed and produced by GROB, and so the individual components are guaranteed to be optimally matched.

Loading systems

Top or front loading

Robot

Top loading

Cartesian linear gantry
Cartesian linear gantry with telescope

Front loading

Swiveling changer

Transportation and automation components

Together with the GROB automation system, the transportation and automation components create a module from which complex automation systems can be combined. The high degree of standardization ensures the best possible price/performance ratio and a high degree of technical optimization.

Transportation and automation components

Automation system
Lifts
Swivel conveyors
Rotates
Transverse stroke device
Swivel units
SPC stations
Zero-point clamping systems
Adapter plates

Accessories

Tool cleaning device

Brushing and air cleaning of the conical and flat surfaces of the tool interface during the machining operation
Combined and patented GROB brushing/blow-off-device

Tool coding

Allows data to flow between tool and machine control
Shorter tooling times
Write-read unit for tools with tool coding
Errors when inputting the tool data avoided

Decentralized work area mist collecting system

Emulsion mist separator with the option to realize an integrated pre-separator stage, a regenerative filtration stage and an integrated post-filter stage with controllable suction power

High-pressure cutting fluid system

Standard version: 23 bar high-pressure cutting fluid pump, including On/Off funktionality
Additional versions for higher pressure requirements: 5-38 bar/10-80 bar high-pressure cutting fluid pump
Option of an additional cooling unit for all high-pressure cutting fluid systems

Continuous cooler

An external continuous cooler of cooling the cutting fluid
Available for all high-pressure cutting fluid pumps

Electromechanical tool breakage detection device

Tool breakage detection via a tactile tool breakage detection device
Monitoring during machining

Touch probe

For aligning and measuring parts or clamping fixtures, as well as for setting zero and reference points for downstream machining operations

Machine status lamp

A three-color status lamp is used to visually indicate the machine status
A distinction is drawn between automatic mode (green), warning (yellow) and malfunction (red)

Oil skimmer

The oil skimmer removes hydraulic and lubricating oil from the cutting fluid surface to keep the cutting fluid as clean as possible

Laser measurement system for milling tools

Contactless, optical tool monitoring/measurement of rotating tools, such as milling cutters and drills

Camera system

Camera solutions for industrial automation and for inspection tasks
Consisting of individual components such as lenses, lighting units, image sensors and software