Flame cutting is the use of iron oxide combustion in the process of high temperature to cut carbon steel, is a common way of steel plate roughing. Numerical control technology introduces flame cutting, realize the automation of the whole process of cutting, significantly improve the cutting quality of steel plate blanking (size range and incision quality, can replace part of the mechanical processing), high production efficiency (continuous cutting, multi-gun cutting) and high material utilization rate (set cutting). SIGRINER AC servo system originated in Germany, deep in Asia. With the advantages of high precision, high response speed, self - tuning, it is more and more applied to the field of industrial control. This paper mainly introduces the application of SIGRINER Ω6 pulse servo in NC flame cutting machine.

Key words: NC flame cutting; SIGRINER pulse servo;

CNC flame cutting machine introduction

Numerical control flame cutting machine is to use digital program to drive machine tool movement, equipped with flame cutting system, the use of numerical control system to control the switch of flame cutting system, steel plate and other metal materials for cutting. CNC flame cutting machine is mainly composed of flame cutting system, machine body, and motion control system (CNC system + servo system).

CNC flame cutting machine appearance

As shown in FIG. 1, the CNC flame cutting equipment generally adopts gantry design and is set in accordance with Cartesian three-dimensional coordinate system. There are three feed axes in X/Y/Z directions. The X/Y axis is driven by rack and pinion, and the control mode is position control. The machine runs at a speed of 0-8m/min. The Z axis drives the cutting machine head to complete the up and down movement through a set of servo drive system, and the driving mechanism is ball screw. Numerical control + servo system controls the transverse and longitudinal motion into the cutting torch trajectory, that is, the shape of the workpiece to be cut.

The flame cutting system uses acetylene, propane, liquefied gas, coke oven gas, natural gas and other gas to cut metal materials with oxygen. Torch is the main tool for flame cutting.

The cutting process is shown as follows:

System configuration

The motion control system is mainly composed of numerical control system, servo driver and servo motor. As shown in the picture below:

System configuration diagram

The servo system configuration list is shown in the table

Figure 6ω 6 AC servo system

SIGRINER Ω6s-AP series pulse AC servo system is adopted in this scheme, which provides comprehensive safety protection against harsh operating environment:

(1) The product has passed CE certification and meets the safety requirements of relevant equipment in European and American markets.

(2) Independent cooling duct + temperature monitoring system + thickened UV layer to resist high temperature, high humidity, conductive dust and other harsh environment.

(3) Through more than 300 rigorous tests in HASS and HALT experiments, it still operates stably in a variety of harsh environments.

(4) Built-in black box, real-time monitoring operation status, diagnosis of potential risks, timely maintenance more secure. In addition to durability, Ω6s-AP pulsed AC servo system also has the following characteristics:

• Speed loop bandwidth 3.5kHz;

• Strong power, can easily cope with 115% continuous load overload rate,350% instantaneous overload;

• Inertia online identification + parameter online self-tuning, easily cope with 30 times inertia ratio, saving 90% equipment debugging time.

Ω6s-AP servo drivers with its high cost performance, high responsiveness, high precision and ease of use and other advantages are widely used in general industrial control situations, to provide overall automation control solutions to meet the needs of customers in various industries to improve quality, expand capacity, reduce costs. For this case, large gantry structure. SIGRINER driver gantry synchronous control through two independent servo drivers synchronous control of the gantry frame under the two parallel axis, to achieve synchronous movement of gantry mechanism. Among them, RT_HyperGS bus is a real-time synchronization bus developed by SIGRINER for distributed gantry. It can meet the requirements of synchronous control timing sequence and synchronous data exchange between two servo drivers, and has the advantages of high response, high synchronization, low cost and high reliability.