First of all, under the premise of aluminum material, the following aspects should be considered.
1. Irresistible factors:
1. stability of machine tool itself.
If it is not for the new machine tool or the machine tool has gone through a lot of processing without debugging, there will be the size error caused by the machine tool itself.
The error of the machine tool has the following factors:
(1) mechanical aspects:
A. servo motor and screw loose.
B. ball screw bearing or nut wear.
There is not enough lubrication between the C. screw and the nut.
(2) electrical aspects:
A. servo motor failure.
There is dirt inside the B. grating ruler.
C. servo amplifier failure.
System parameters can be PMC recovery, so do not mention.
2. cooling deformation after workpiece processing.
This is basically unavoidable, pay attention to the use of coolant as much as possible in processing, as well as in-situ measurement, pay attention to the deformation of the cooled workpiece.
Two, avoidable factors:
1. processing technology: CNC Machining
In fact, most of the actual processing errors are caused by unreasonable processing technology, on the basis of ensuring the basic processing technology (such as milling NC processing “first rough then fine, first face then face, first big face then small face” or the use of fixture “reduce clamping times, try to use modular fixture” and other basic processing technology details). For example, in FANUC or Huazhong Machining Center, G83 instruction is used to drill deep holes so that the iron chips can be discharged.
2. cutting three elements:
Cutting speed vc, feed f, cutting depth AP and tool compensation are not very detailed. In a simple word, it is on the premise of guaranteeing processing quality and tool wear, to adjust parameters to give full play to tool cutting performance, so that cutting efficiency is the highest and processing cost is the lowest. In CNC lathes, there are elements such as tool wear compensation.
3. numerical calculation in manual programming and automatic programming:
In manual programming, calculating errors is also a common situation, but now most of the production is automatic programming, so this part is just a reminder, make up a word.
4. accurate tool setting:
The inaccuracy of tool alignment is also the cause of size errors, so try to choose a good edge finder, if the machine tool has an automatic tool alignment, it would be better. If there is no edge finder, try to cut it, this is the operation experience. The above is a summary of several factors that can easily cause errors in NC machining. We hope our partners will benefit.
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