During the machining of the CNC turning center, chatter lines appear on the parts. I guess the friends of the dryer have met more or less. This situation can be described as basically everywhere in the factory.
I believe that you will often encounter it when making a fine car. The car does not have a beautiful appearance. It needs to be quietly polished with fine sandpaper or oilstone. In particular, electroplating is required after high precision is required. At this time, it is necessary to be very careful, otherwise it is easy to constitute a waste product.
Because there are too many elements that can make the product appear chattering, we can start with the investigation from these aspects, and we must analyze in detail according to our own factory situation.
Firstly, judge whether there is "chattering pattern". The usual rule is: horizontal pattern appears, as shown in the picture is a spiral pattern with relatively large spacing.
1. It is necessary to understand whether the workpiece appears chatter marks after one-time machining, or if the workpiece appears chatter marks after the second finishing.
2. Does the machine collide? If it collides, the Z-axis screw and spindle are likely to have effects, and vibration lines will appear in this case.
3. Take a look at whether the machine speed is within a reasonable range, and at the same time change the rotation feed to the sub feed in the sequence and try it. (The speed of the machine tool is resolutely large, resulting in uneven rotation and feed speed, accelerating and decelerating from time to time. If the accuracy of the machine tool private server unit and actuator is not high enough, it is easy to form ripples)
The display on the ordinary machine tool panel is the speed reflected by the actual spindle encoder. See whether the speed can be determined at the time of its obligation. The most direct way is to directly change the rotation feed to the component feed. If the effect is improved, then the ordinary It is the defect of the encoder or the defect of the inverter.
4. The rigidity of the drive of the machining center system is not good
5. The workpiece itself or the fixed rigidity of the workpiece, such as some small and thin parts due to their lack of rigidity, or due to the shape of the workpiece, can not be adequately fixed by the use of a reasonable press fixture.
6. The Z-axis screw supports the bearing, and the loose back cap can easily cause vibration lines.
7. The knife has no effect. Can the tip arc be too large? If the blade is too wide, it is easy to have horizontal lines. You can directly change the hand to sharpen the knife to reduce the vibration. Perhaps the tip of the knife sharpens the transition edge.
8. Rigidity and dynamic balance of external causes Relative to the axis of rotation, the mass imbalance caused by external elements will cause chattering due to the unbalanced centripetal force during rotation. Especially in high-speed processing, the dynamic balance of things has a great impact.
9. The selection of cutting parameters includes cutting speed, feed, feed amount and cooling method.
10. The machine tool guide rail of the machining center is loose
In fact, the appearance of added chatter marks should be avoided from the source, and try to avoid vibration when cutting the workpiece.
