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Several common faults and troubleshooting of CNC machine tools

Article source:China Hardware processing netwResponsible editor:adminauthor:Kangding HardwarePopularity: Publication time:2017-05-11 21:55 font size:【 large middle Small

Several common faults and troubleshooting of CNC machine tools
 
Each product will be a bad time, if the product is generally nothing, but if it is a large machine is broken, it is indeed a hassle, but also affect the entire program, so learn to diagnose the fault is necessary. CNC machine tools is a high precision and high efficiency of automated machine tools. Here's a look at the CNC machine tools common failure analysis and troubleshooting. Since the use of CNC machine tools, computer control technology, mechanical structure greatly simplified as compared with the general machine tools, mechanical chance of system failure greatly reduced, the common mechanical problems are mainly the following categories:1, the feed drive chain failure. Since the CNC machine tool commonly used by rail rolling friction, so the feed drive chain failure was mainly caused by the decline in the quality movement, such as mechanical parts not moved to a predetermined position, outages, positioning accuracy down backlash increases, mechanical crawling, bearing noise becomes large (usually after the crash occurred), etc. this part of the fault by adjusting the deputy campaign preload adjust loose links and improve the accuracy of motion compensation and adjustment links and other methods to resolve.
2, the spindle component failure. Since the use of variable speed motors, CNC machine tool spindle box structure is relatively simple, prone to failure is to handle automatic tensioning device, automatic speed control devices.
3, automatic tool changer (ATC) fault. Machining centers with automatic tool changer for more than 50% of the fault and the automatic tool changer, primarily reflected in: magazine fault movement, positioning error is too large, the mechanical hand gripping the handle is unstable, the larger robot motion errors. Severe fault, causing stuck tool change, the machine was forced to stop working.
4, limit switch for detecting the position of each axis motion nip fault. CNC machine tools, in order to ensure the reliability of automation, using a large number of motion detection position limit switch. After long-running machine, moving part motion characteristics change, change reliability and limit switch limit switch pressing device itself quality characteristics of the machine and troubleshooting faults generate a greater impact.
5, the failure of matching accessories. Reliability CNC machine tool cooling device, chip conveyor, guard rails, protective cover coolant, spindle cooling thermostat tank, hydraulic tank, etc. is not high, it can also cause failure affecting the normal operation.
1, CNC machine troubleshooting methods
Fault diagnosis should grasp the following principles in:
After the first external 1.1 Internal
Reliability modern CNC system more and more, the CNC itself, the failure rate getting lower and lower, and most of the non-occurrence of failure of the system itself causes.Since the CNC machine tool is a mechanical, hydraulic, electrical as one of the tools, which will occur by the failure of these three comprehensive reflected. Maintenance personnel should be from outside to inside one by one investigation. Try to avoid casually unsealed, disassemble, otherwise it will expand failure, so that the loss of precision machine tools and reduce performance. External to the system failure was mainly due to the problems with the detection switch, hydraulic components, pneumatic components, electrical actuators, mechanical devices caused.
1.2 After the first electrical machinery
In general, mechanical failure easier to find, and the difficulty of diagnosis CNC system and electrical faults. Before troubleshooting, first rule out mechanical failure.
1.3 to static and dynamic
First off the machine stationary state, through understanding, observation, testing, analysis, does not cause the failure to expand confirmation energized after the accident, only to the machine is switched on. In the operating state, the dynamic observation, inspection and testing, troubleshooting. After while will happen after the destructive power failure, you must first rule out the danger, before electricity.
1.4 briefly after complex
When multiple failures are intertwined, and sometimes impossible to start, it should be easy to solve the problem after solving more difficult problems. After solving the problem often simple, the difficult problem may become easier.
Furthermore, human factors also contributed to one of the external reasons for the failure of CNC machine tools, according to the statistics, the first use of CNC machine tools, or by a non-skilled workers to operate the CNC machine tools, in use, the external fault caused by improper operation of the machine to account for the total more than a third failure.

In addition to these common faults classification, there are many other different classifications. Such as: When you press the failure Have destructive. It can be divided into two kinds of destructive and non-destructive fault fault. By failure and in need of repair site specific function. Can be divided into numerical control device failure, feed servo system failure, spindle drive system failure, system failure and so white dynamic tool changer, this classification method is often used when servicing.
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