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Clients often come to us with just an idea and let us help design models and CNC parts.
Usually, when we receive such an inquiry, we will assign it to our corresponding engineer as soon as possible. Our engineer will start from the design draft of the CNC part, the processing technology required, the surface treatment of the part, and the selection of the material for the machined part. And we will communicate and discuss with our customers one by one. Ultimately provide the optimal solution for our customer’s CNC parts.

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YIJIN Hardware Analyse 8 Undesirable Phenomena And Solutions In NC Turning

Fault cause: The tooltip is damaged, not sharp; Machine tool resonance and placement is not stable; The machine tool crawls; The processing technology is not good.

Solution: Tool wear or damage is not sharp, then re-sharpen the knife or choose a better tool to re-tool; Machine resonance or placement is not stable, adjust the level, lay the foundation, fixed and stable; Mechanical crawling causes the drag plate guide wear, screwball wear or loose, the machine should pay attention to maintenance, should clean the wire after work, and add lubricating oil in time to reduce friction; Select coolant suitable for workpiece processing, in the case of meeting the processing requirements of other processes, as far as possible to choose a higher spindle speed.

Cause of failure: the level of machine placement is not adjusted well, one is high and one is low, resulting in unstable placement; When turning the long shaft, the contribution of material is hard, the tool is deep, resulting in the phenomenon of letting the knife; Tailstock thimble is different from the spindle.

Solution: use a level to adjust the levelness of the machine tool, lay a solid foundation, fix the machine tool to improve its toughness; Choose reasonable technology and appropriate cutting feed to avoid cutting tool force; Adjust tailstock.

The fault causes: the machine tool pallet runs at a high speed for a long time, leading to screw and bearing wear; The repeated positioning accuracy of tool rest produces deviation in long-term use. The drag plate can accurately return to the starting point of processing each time, but the size of the workpiece is still changed. This phenomenon is generally caused by the spindle. The high-speed rotation of the spindle makes the bearing wear seriously, resulting in the size change of processing.

Solution: use a dial indicator at the bottom of the tool rest, at the same time through the system to edit a fixed cycle program, check the repeated positioning accuracy of the drag plate, adjust the screw clearance, replace the bearing; Check the precision of tool rest’s repeated positioning with dial indicator, adjust the machine or replace the tool rest; Use dial gauge to detect whether the workpiece is returned to the starting point of the program accurately. If it is possible, overhaul the spindle and replace the bearing.

The fault causes: fast positioning speed is too fast, the drive and motor can not respond; In the long-term friction loss after the mechanical drag plate screw and bearing too tight stuck; The tool holder is too loose after the tool change, and the lock is not tight; Edit the program error, head, tail no echo or cancel the end of the knife; The electronic gear ratio or step Angle of the system is incorrectly set.

Solution: If fast positioning speed is too fast, then adjust the speed of G0, cutting speed and time to make the driver and motor work normally under the rated operating frequency; In the machine, tool wear is produced after the drag plate, screw crane bearing is too tight stuck, it must be readjusted repair; If the tool rest is too loose after a tool change, check whether the tool rest reversal time is met, check whether the worm inside the tool rest is worn, whether the gap is too large, whether the installation is too loose, etc. If it is caused by the program, it must modify the program, improve in accordance with the workpiece drawings, and choose a reasonable processing technology, in accordance with the instructions of the instruction manual to write the correct program; If the size deviation is too large, check whether the system parameters are set properly, especially whether the parameters such as electronic gear and step Angle are damaged. This phenomenon can be measured by making a dial indicator.

The fault causes: vibration frequency overlap leads to resonance; Unreasonable parameter setting and excessive feed speed make arc machining out of step; Loose screw clearance caused by large or screw too tight caused by out of step, synchronous belt wear.

The solution: Find the resonant component and change its frequency to avoid resonance; Consider the workpiece material processing technology, and reasonable programming; For stepper motor, processing rate F can not be set too large; Whether the machine is firmly installed, placed smoothly, whether the drag plate is too tight after wear, clearance increases or tool rest loosens; Replace the timing belt.

Cause of failure: must carefully check the fixture, and take into account the operator’s operation method, and the reliability of clamping, due to the size change caused by clamping, must improve the fixture so that workers as far as possible to avoid human negligence to make misjudgment phenomenon; Numerical control system may be affected by the fluctuation of external power supply or interference after automatic interference pulse, to drive the drive to accept excess pulse drive motor to take away or less phenomenon.

Solution: grasp the rule, try to use some anti-jamming measures, such as strong electric field disturbance of high voltage cables and weak current signal of the signal isolation, join the absorption capacity of anti-interference and a shielding wire isolation, in addition, check whether the ground wire connection is firm, grounding contact recently, all anti-interference measures should be taken to prevent the system disturbance.

Fault cause: whether the parameters of the program section are reasonable, whether they are in the predetermined track, and whether the programming format meets the requirements of the specification.

Solution: thread program segment appear disorderly teeth, the pitch is not correct, then immediately associated with the processing of thread peripheral configuration (encoder) and the objective factors of the function.

Fault cause: programming error; System parameters are improperly set. Improper configuration Settings; Mechanical transmission parts have regular periodic changes of failure.

Solution: Check whether the instructions used by the program are executed according to the requirements specified in the instruction manual. You can judge by making a dial indicator. Locate the dial indicator at the starting point of the program and let the drag board return to the starting point after the end of the program. Check whether the system parameters are set properly or are considered to be changed. Whether the single calculation meets the requirements and the pulse equivalent is accurate in the connection calculation coupling parameters of the relevant machine configuration; Check whether the transmission part of the machine tool is damaged, whether the gear coupling is uniform, check whether there is a periodical, regular fault phenomenon, if there is, check its key part and give elimination.