1. Diagnostic method: Use the diagnostic function of NC system to check the status of input signal, output signal and intermediate relay, etc. The use of diagnosis can quickly determine the location of the fault point, and then focus on the area to find the cause of the fault.
2 observation method: observation method is commonly used in the process of maintaining CNC machining tools. Sometimes, a fault can be easily solved by observation. Observation method one is to see, observe whether there is damage to the cable skin, whether the component has smoke, burning phenomenon, whether the plug, wiring off, press the twist, whether the switch is broken, whether the indicator light is complete, whether there is a large amount of dust on the surface of the component; The second is to touch by hand, power failure inspection can be used to gently shake the transformer wiring is loose, burning phenomenon, whether the combination between terminals and wires is tight, whether the rotating motor shaft is too tight, whether the electrical components are hot and welding point is firm, etc.; Three is to listen to the ear, listen to the motor rotation when there is no noise and abnormal sound, transformer beeping. Attention should be paid to abnormal machining tool vibration and excessive vibration sound in processing, which will become the factors of failure.
3. Measurement method: measurement method is the basic method to find the fault of CNC machining tools. When the machining failure, the use of hand-heavy instruments, instruments refer to the electrical schematic diagram and control system logic diagram and other data, along the fault channel, step by step measurement, until the fault point is found.
4. Substitution method: substitution method can quickly reduce the fault from a large range to a small range, and then to a smaller range. The more complex the electrical system, the better.
5. Empirical method: empirical method is often repeated failure of CNC machining tools, with long-term accumulated experience, for the manifestation of the fault, it immediately thought of the fault may occur in which part.
6. Comprehensive method: comprehensive method is a comprehensive grasp of the above methods of skills, comprehensive use, mastery, flexible use. This is because, the above methods have advantages and disadvantages, and more failures are complex, single use of a method is difficult to be expected effect.
For example
1, cast iron product model is accurate, surface lubrication is poor.
Solution: after nc cutter damage or damage is not sharp, knife again, or choose more nc tool again to knife, machining tool placed is not stable, lead to a total shock or regulate level, lay the foundation, stationary won't change won't change stable mechanical equipment cause of crawling movement for plate slide rail damage is good or bad, just bead damage or ball screw to fall off.
machining tools should pay attention to protection and maintenance, operation should be eliminated in the future fine wire, and immediately add grease, in order to reduce friction; Select the appropriate engine coolant for cast iron production and processing, and make sure that other production processes produce and process rules, as far as possible, use a higher spindle reduction ratio of the lathe.
2. Mechanical failure of the taper head caused by cast iron parts: the level of the machining tool is not well adjusted, one high and one low, resulting in unstable placement of the drilling shaft, the raw material is hard, the CNC cutting tool is deep, resulting in the tool letting situation: the tail seat mold thimble is not the same as the lathe spindle.
Solution: use the level to adjust the flatness of the machining tool, get a solid foundation and foundation, fix the machining tool will not change will not change to improve its ductility; Select effective production process and moderate drilling tool durability to avoid numerical control tool pressure to let the knife; Conditioning tail seat.
3 controller position light all normal, and the production of processed cast iron products when the model is large or small.
Causes of mechanical failure: the machining tool support plate can not help running at high speed, leading to the damage of screw nut and roller bearing; The continued precision of the tool rest leads to errors in involuntary use; The supporting plate can accurately return to the starting and ending point of production processing each time, but the production processing cast iron product model is still changed. This kind of situation is generally caused by the lathe spindle. The high-speed rotation of the lathe spindle causes serious damage to the roller bearing, leading to the transformation of the production and processing products.
Solution: the fat fraction table is at the bottom of the tool rest. In addition, according to the system software, a fixed and immovable operation process will not change the digestive system. Check the continued precision of the support plate, adjust the screw nut space, disassemble and install roller bearings; Dial indicator to check the continued precision of the tool rest, conditioning mechanical equipment or disassembly tool rest; Use a dial gauge to test whether the production of cast iron is accurate after the return to the starting and ending point of the operation process. If so, repair the lathe spindle and disassemble the roller bearing.
Asset Metal technology company is a focusing on CNC machining, metal stamping, metal(chemical) etching and surface treatment of OEM/ODM metal parts Processing.
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