Reasons For CNC Machining Accuracy Problems

Today, the Aluminum CNC Turning Factory will tell you what happened to the CNC machining accuracy.

1. Accurate workpiece size and poor surface finish

Causes of failure: The tool tip is damaged and not sharp; the machine tool has resonance and is not stable; the machine tool has a creep phenomenon; the processing technology is not good.

Solution: If the tool is not sharp after being worn or damaged, re-sharpen or select a better tool to re-set the tool; the machine has resonance or the placement is not stable, adjust the level, lay the foundation, and stabilize it; the reason for the machine to crawl is drag The plate guide rail wears a lot, and the screw balls wear or become loose. The machine tool should pay attention to maintenance. After work, clean the wire and add lubricating oil in time to reduce friction. Choose a coolant suitable for the workpiece processing. In the case, try to choose a higher spindle speed.

2. The workpiece has a taper size head

Causes of failure: The placement level of the machine tool is not adjusted properly, one is high and the other is low, and the placement is not stable; when turning the long axis, the contributing material is relatively hard, the tool eats the knife deeper, causing the phenomenon of giving up the knife;

Solution: Use a spirit level to adjust the levelness of the machine tool, lay a solid foundation, fix the machine tool to improve its toughness; choose a reasonable process and a suitable cutting feed to prevent the tool from being forced to give up the tool; adjust the tailstock.

3. The arc effect is not ideal, and the size is not in place

Cause of failure: resonance caused by overlapping vibration frequency; processing technology; parameter setting is unreasonable, feed speed is too high, making arc processing out of step; loosening caused by large screw clearance or out of step caused by too tight screw; timing belt abrasion.

Solution: find out the components that generate resonance, change their frequency, and avoid resonance; consider the processing technology of the workpiece material and reasonably program; for stepper motors, the processing rate F should not be set too large; whether the machine tool is installed securely, placed smoothly, and dragged Whether the board is too tight after abrasion, the gap is enlarged or the knife holder is loose, etc.; replace the timing belt.

Aluminum CNC Machining

4. Occasionally out of tolerance during mass production

Cause of failure: Careful inspection of the tooling fixture must be taken into consideration, and the operator's operation method and the reliability of the clamping must be taken into account. Due to the dimensional changes caused by the clamping, the tooling must be improved so that workers can avoid misjudgment as much as possible due to human negligence. Interference pulses are automatically generated after being affected by external power supply fluctuations or disturbances, which are transmitted to the driver to cause the driver to accept excess pulses to drive the motor to take away or less.

Solution: Understand the law and try to adopt some anti-interference measures, such as: strong electric cables with strong electric field interference are isolated from signal lines of weak electric signals, add anti-interference absorption capacitors and use shielded wire to isolate, and check the ground wire Whether the connection is firm and the ground contact is nearest. Take all anti-interference measures to avoid system interference.

5. Each process of the workpiece is increasing or decreasing

Causes of failure: incorrect programming; system parameter settings are unreasonable; configuration settings are incorrect; mechanical transmission components have periodic and periodic changes and malfunctions.

Solution: Check whether the instructions used by the program follow the required trajectory specified in the instruction manual. You can judge by dialing the dial indicator, positioning the dial indicator at the starting point of the program, and letting the carriage return to the starting point after the program is over. Even if you observe the results, master the laws.

The above is the reason why CNC machining is the problem of accuracy, especially when Aluminum CNC Machining, I hope to help everyone.