Alarm method based on function safety threshold of numerical control system

Abstract

The invention relates to an alarm method based on a function safety threshold of a numerical control system. The method comprises the following steps that the structure of the numerical control systemis divided into multiple layers; a numerical control system safety threshold of each layer is calculated; and alarm is raised when a feedback signal of the numerical control system exceeds the safetythreshold. According to the invention, function safety threshold indexes are distributed on the basis of software structures of the numerical control system, it is ensured that the system is completeand consistent, and the relative weights of elements are distributed reasonably. Thus, an distribution method is more effectively, and basis is provided for system feasibility.

Description

technical field [0001] The invention relates to the field of functional safety of a numerical control system, in particular to a method for alarming according to calculation of a functional safety threshold of a numerical control system. Background technique [0002] Numerical control technology is the core of advanced manufacturing technology and the basis for manufacturing automation, networking, flexibility and integration. As the control center of various CNC machine tools, the CNC device is called the soul and brain of the machine tool. If it breaks down and fails, it will directly lead to abnormal actions of machine tool processing, resulting in damage to machine tool components or workpieces, and even casualties. Therefore, the functional safety of numerical control devices is a hot research direction of key technologies in the field of numerical control. At present, the numerical control device mainly adopts the control system structure based on the microprocessor,...

AI Technical Summary

Problems solved by technology

At the same time, there are a large number of safety state detection signals during the operation of the machine tool and the CNC system, and at the same time include hardware signals from the servo motor overload alarm on the machine tool, machine tool limit switch, oil pressure alarm, air pressure alarm and other auxiliary systems, as well as the CNC device. Software signals such as soft limit and out-of-tolerance in the program control process require a large number of control signals to be monitored, and the correlation between signals is complicated; in addition, the real-time response speed of status judgment is high.

Mainstream foreign manufacturers such as Germany's Siemens and Japan's FANUC use full redundancy (that is, multi-processor redundant processing structure), and at the same time realize functional safety alarms by means of cross-checking, the system design complexity is high, and expensive

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