Modern CNC machine tools have many causes of failure, and their failure characteristics and causes can be divided into systematic and random failures; diagnostic display and no diagnostic display failure; destructive and non-destructive failure; motion quality characteristic failure; hardware and software failure.
Due to the wide variety of CNC machine tools, the parts of the CNC machine tool failure can basically be:
1. The mechanical part is faulty. Such as feed drive chain failure, spindle component failure, ATP failure, accessory accessory failure, etc.
2. The electrical part of the machine body and the high-power control part are faulty. If the axis motion hardware is over-traveled, the tool magazine cannot find the tool fault, the spindle does not divide the fault, the tool and fixture clamp the fault, the various motors do not work, the lubrication device fails.
3. The feed servo system is faulty. Such as servo feed system error, detection error, overheat alarm, high current, high voltage, low voltage, overload, speed feedback disconnection, protection switch action alarm, machine tool out of control, vibration, overshoot noise, cylindricity fault Wait.
4. The spindle servo system is faulty. Such as spindle motor vibration, noise, large speed deviation or exceeding the rated value, motor overheating, excessive current, regenerative circuit fuse blow failure.
5. The CNC system is faulty. Such as CRT no brightness, no picture, NOTREADY display, PROGRAMSTOP display, MDI is invalid, HOME is not normal, electric hand wheel failure failure.
At present, the startup, online and offline diagnostic technologies of the CNC system have made great progress, which is of great help to fault diagnosis and positioning. However, when the CNC machine tool fails, it must be quickly and correctly excluded, often involving many aspects. This requires the maintenance personnel to have a comprehensive theoretical knowledge, practical skills and other high professional qualities, fully understand the investigation of the fault scene, list the many factors that may cause the failure, and use the necessary measurement techniques to gradually find out the cause of the failure.
(Finish)
Petroleum coke is a black or dark gray hard solid petroleum product with metallic luster and is porous. Petroleum coke components are hydrocarbons, containing 90-97% carbon, 1.5-8% hydrogen, nitrogen, chlorine, sulfur and heavy metal compounds.
Petroleum coke is a by-product of the pyrolysis of feedstock oil in delayed coking units at high temperatures to produce light oil products. The output of petroleum coke is about 25-30% of the raw oil. Its low calorific value is about 1.5-2 times that of coal, the ash content is not more than 0.5%, the volatile matter is about 11%, and the quality is close to anthracite.
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