Inspection of CNC Machine Tool Performance and System Function

1. Machine Tool Performance The machine tool performance includes spindle system performance, feed system performance, automatic tool change system, electrical devices, safety devices, lubrication devices, gas-liquid devices, and accessories.

Different types of machine tools have different inspection items. The inspection of the performance of CNC machine tools is basically the same as that of ordinary machine tools. The main reason is to check whether there are abnormal phenomena and noise in the start, stop, and operation of each moving component and auxiliary device through “reading and hearing” and trial operation. The lubrication system, cooling system, and each Is the fan working properly?

2. Numerical control function The function of the numerical control system differs according to the type of machine tool it is equipped with. The inspection and acceptance of the numerical control function should be in accordance with the specifications of the numerical control system equipped with the machine tool and the order contract, and the manual machine or program should be used to detect the machine tool should have. The main function.

The main contents of numerical control function inspection are:

(1) Motion command function Checks the correctness of fast-moving commands, linear interpolation, and circular interpolation commands.

(2)Prepare command function to check the accuracy of commands such as coordinate system selection, plane selection, pause, tool length compensation, tool radius compensation, pitch error compensation, backlash compensation, mirror function, automatic acceleration/deceleration, fixed cycle, and user macro program Sex.

(3) Operation function Checks the accuracy of functions such as origin return, single block, block skip, spindle and feed override, feed hold, emergency stop, spindle and coolant start and stop.

(4) The CRT display function verifies the accuracy of functions such as position display, program display, menu display, and editorial change.

The best way to test the CNC function is to make a test machine program for the machine to run automatically for 16h or 32h under no-load conditions. The machine program can include the following:

(1) Spindle rotation shall include forward rotation, reverse rotation, and stoppage of five or more speeds including the nominal minimum, intermediate, and maximum rotation speeds.

(2) Each coordinate motion shall include the nominal minimum, intermediate and maximum feed speeds and rapid movements. The feed movement range shall be close to the full stroke, and the rapid movement distance shall be within 1/2 of the full stroke of each coordinate axis.

(3) Some functions and codes used in general automatic machining should be used as much as possible. (4) Automatic tool change: At least one third of the tool number in the tool magazine should be exchanged, and the handle with medium weight must be installed. The special functions that must be used for actual delivery (5), such as measurement functions, APC exchanges, and user macro programs, are continuously run using the machine program to check the smoothness and reliability of the machine's various movements and actions, and to emphasize No fault is allowed in time. Otherwise, it is necessary to restart the specified time after repairs, and it is not allowed to accumulate parts to the specified operating time.

3. Continuous operation 4. Machine appearance quality