GB/T 32245-2015Numerical control system of machine tool—Reliability test and evaluation (English PDF)

2.1 CNC machine numerical control system

Control system for controlling machine tool machining function by numerical control.

Note 1. rewrite GB/T 26220-2010, definition 3.1.

Note 2. The machine numerical control system generally includes the hardware device and the corresponding software. Machine CNC system mainly by the numerical control device (also known as the control unit), drive device (Motor drive unit and motor, sensor) and other components. CNC device is a major part of the machine tool CNC system, including microprocessors, transport (I/O) interface with communication, human-machine interface (display and keyboard), action button (key), etc. (and /

Or circuits) and their corresponding control software.

Note 3. Machine CNC system has a variety of classification methods. According to the different functions, machine numerical control system is usually divided into simple, high-performance and universal three; root

According to the different application process, can be divided into two kinds of dedicated and universal numerical control system; according to the different forms of feedback control can be divided into open-loop control and closed-loop control

Two kinds; according to the different processing control methods, can be divided into point control, linear control and contour control three.

[JB/T 11989-2014, definition 2.1.3]

2.2 Reliability

The ability of the numerical control system to complete the specified function within the specified conditions and within the specified time interval.

Note. rewrite GB/T 2900.13-2008, defined 191-02-06. It is generally assumed that the CNC system is in the form of a function that can perform the required function at the beginning of the time interval state. In addition, although the value of reliability is objectively present, it is actually unknown and can only use limited sample observations,

Of the statistical calculation of its estimated value. The magnitude of the reliability is also called reliability.

[GB/T 29545-2013, definition 3.1]

2.3 Mean time between failures Meanoperating timebetweenfailures; MTBF

Mathematical expectations of working hours between adjacent failures, also mean the average working time or average failure interval between adjacent two failures.

Note. rewrite GB/T 2900.13-2008, defined 191-12-09.

[GB/T 29545-2013, definition 3.3]

2.4 Stress

Affect the numerical control system modules, components of the failure rate of electricity, heat, mechanical load.

Note. rewrite GJB/Z35-1993, definition 3.4.

CNC system to withstand the stress usually have many kinds, such as electrical stress, temperature stress, mechanical stress, etc..

a) electrical stress. refers to the components of the voltage/current and power;

b) temperature stress. refers to the temperature of the working environment in which the components are located;

c) mechanical stress. refers to the components of the direct load, pressure, shock, vibration, collision and drop;