How to maintain a vertical machining centre ?

The maintenance and repair of machining centres

CNC machine types, various types of CNC machine tools due to their functions, structure and system differences, each with different characteristics. The content and rules of maintenance also have their own characteristics, specifically according to the type of machine tool, model and the actual use of the situation, and with reference to the requirements of the machine tool instruction manual, the development and establishment of the necessary regular, graded maintenance system. The following are some common, general daily maintenance points.

(A) CNC system maintenance

1, strict compliance with operating procedures and routine maintenance system

CNC equipment operators should strictly comply with operating procedures and routine maintenance system, the operator's technical and business quality of the quality is an important factor affecting the frequency of failure. When the machine tool failure, the operator should pay attention to keep the scene, and to the maintenance personnel to truthfully explain the situation before and after the failure, in order to facilitate the analysis and diagnosis of the cause of the failure, timely elimination.

2, to prevent dust and dirt into the internal CNC device

In the machining shop air will generally have oil mist, dust and even metal powder, once they fall in the CNC system within the circuit board or electronic devices, easy to cause a decrease in insulation resistance between components, and even lead to components and circuit board damage. Some users in the summer in order to make the CNC system can be overloaded long term

In order to make the CNC system can work overload for a long time in the summer, take to open the door of the CNC cabinet to heat, this is a highly undesirable method, which will ultimately lead to accelerated damage to the CNC system should be minimised to open the door of the CNC cabinet and the strong electrical cabinet.

3, to prevent the system from overheating

Should check the CNC cabinet on the cooling fan is working properly. Every six months or every quarter to check whether the air duct filter is clogged, if too much dust accumulates on the filter, do not clean up in a timely manner, it will cause the CNC cabinet temperature is too high.

4, the CNC system input / output device regular maintenance

CNC machine tools produced before the 80's, most with photoelectric paper tape reader, if the reading part of the tape is contaminated, will lead to read the information into the error. For this reason, the photoelectric reader must be maintained as required.

5, DC motor motor brush regular inspection and replacement

Excessive wear and tear of DC motor brushes will affect the performance of the motor and even cause damage to the motor. For this reason, the motor brushes should be regularly checked and replaced. CNC lathe, CNC milling machine, machining centre, etc., should be checked once a year.

6, regular inspection and replacement of storage batteries

General CNC system for CMOS RAM memory devices with rechargeable battery maintenance circuit to ensure that the system is not powered during the memory to maintain its content. In general, even if not yet failed, should be replaced once a year to ensure that the system works properly. Battery replacement should be carried out in the CNC power supply state, in order to prevent the replacement of the RAM information is lost.

7, the maintenance of spare circuit boards

Spare printed circuit boards are not used for a long time, they should be installed into the CNC system periodically to run for a period of time under power, in order to prevent damage.

(ii) Maintenance of mechanical parts

1、Maintenance of main drive chain

Regularly adjust the spindle drive belt tightness, to prevent loss of rotation caused by belt slippage; check the spindle lubrication thermostatic oil tank, regulate the temperature range, timely replenishment of oil, and clean the filter; spindle in the tool clamping device for a long time after the use of the gap, affecting the clamping of the tool, you need to adjust the displacement of the piston of the hydraulic cylinder in a timely manner.

2、Maintenance of ball screw threaded vice

Regularly check and adjust the axial clearance of the ball screw threaded vice to ensure reverse transmission accuracy and axial rigidity; regularly check the connection between the ball screw and the bed to see if there is any looseness; the ball screw guards should be replaced in time in case of damage to prevent dust or swarf from entering.

3、Maintenance of tool magazine and tool change robot

Strictly prohibit the overweight, long tool loaded into the tool magazine, in order to avoid manipulator tool change knife or tool and workpiece, fixture collision; often check the zero position of the tool magazine back to the correct position, check the machine tool spindle back to the tool change point position in place, and timely adjustments; power on, should make the tool magazine and the manipulator empty run, check the work of all parts of the normal, in particular, the travel switches and solenoid valves can be normal; check the tool locking in the manipulator is reliable. Tool locking in the robot is reliable, found abnormal should be dealt with in a timely manner.

(C) hydraulic, pneumatic system maintenance

Regular lubrication, hydraulic, pneumatic system of the filter or sub-filter cleaning or replacement; regular oil quality testing of the hydraulic system to check, add and replace the hydraulic oil; regular water filter on the pneumatic system water discharge.

(D) the maintenance of machine tool accuracy

(E) regular machine level and mechanical accuracy checks and corrections. Mechanical accuracy of the correction method has two kinds of soft and hard. The soft method is mainly through the system parameters compensation.

(F) such as screw backlash compensation, the positioning accuracy of the coordinates of the fixed-point compensation, the machine tool back to the reference point position correction, etc.; hard method is generally to be carried out in the machine tool overhaul, the

(G) such as guide rail repair scraping, ball screw nut sub-preload adjustment backlash.