1. Pain points of plane laser cutting machine
1.1 on the market, most of them use single laser, and use
manual feeding and unloading, resulting in low efficiency of actual cutting.
1.2 the actual effect of most brands on the market tends to be
the same, with weak competitiveness and serious homogenization.
1.3 single function of machine tool, low bargaining power.
2. Introduction of cooperative manufacturers
A company in
Dongguan, the current cooperation model is 3015 three head laser synchronous
cutting equipment. The feature of the scheme is that the single bus controller
controls three laser heads at the same time, supplemented by the online cutting
function, with good synchronization.
At present, the price of
medium and small power laser is dropping by half at the rate of 18 months. The
efficiency of medium and small power single head cutting machine tool has
basically reached the bottleneck. If the equipment manufacturers want to expand
the sales volume of equipment, they must configure equipment with differential
function. On the basis of a certain laser power, it is necessary to increase
the laser head power.
There
are two original schemes for customers: one is the plane cutting machine with
simple single laser head, with positioning accuracy of ± 0.05mm and repeated
positioning accuracy of ± 0.03mm; the second is to control the three laser
heads with three sets of numerical control systems, with complex control and
poor synchronization.
After
using the scheme of Tsino Dynatron, the customer directly uses a set of
controller to control the simultaneous operation of three laser heads. The
operation is simple. The cost of the customer's machine tool is reduced by tens
of thousands yuan, the positioning accuracy is ± 0.03mm, the repeated
positioning accuracy is ± 0.015mm, the air moving speed is 50M / min, and the
efficiency is at least 80% higher than the original scheme.
4. Characteristics
of controller and driver in multi head cutting scheme
4.1 Controller——ROBOX Controller
1) Online cutting function, through controlling
the linear speed of rack, matching the online speed tracking of laser cutting
head, online cutting is realized.
2) Multi head cutting, controlling multiple laser
heads to cut on line at the same time, the efficiency is doubled, the safety
range is set, the cutting safety is guaranteed, the equipment downtime is reduced,
and the cutting efficiency is increased.
4.2 Servo Drive ——CoolDrive S7
1) The response of current control is
high, the current update time is only 2.5us, and the 16
bit current sampling accuracy.
2) The
speed loop has high frequency response, up to 3kHz, which can realize high
dynamic response.
3) Support
on-line self-tuning, servo debugging process is simple, technical requirements
for customers are reduced.
4) Gantry
synchronization, the driver has its own special gantry synchronization
interface, through the bottom hardware real-time interactive information, the Real time of synchronization control is better than through the
upper computer to control the gantry synchronization.
5) Quadrant
protrusion suppression and other vibration suppression functions can reduce the
vibration at the end of the laser head, improve the cutting accuracy and
efficiency.
6) The
drive information is Easy to view and the device status information can be read
directly from the OLED display screen of the device.
7) Bluetooth
debugging function, S7 can connect with intelligent terminal through Bluetooth,
quickly check the status of the device, real-time debugging, fault analysis and
processing, so that the operation becomes simpler and more intelligent.
5. Multi laser head
servo electrical configuration
6. Concluding remarks
For
the multi head gantry laser cutting machine, there is no room for further
improvement in the common pulse control mode, and the synchronization, accuracy
and processing efficiency have gradually reached the bottleneck. And the
high-performance servo system like CoolDrive S7, which supports EtherCAT bus
communication, is very suitable for high demand application scenarios such as
laser cutting machine tools.