CNC CNC machine tools for processing aluminum materials, what problems should be considered in order to make the dimensions stable during processing?
First of all, under the premise of aluminum materials, there are several aspects to consider:
First, irresistible factors:
1. The stability of the machine itself.
If it is not a new machine tool or the machine tool has undergone a lot of machining without debugging, the dimensional error caused by the machine itself may occur. There are several factors that cause the machine tool itself to have errors:
a. Loose between the servo motor and the lead screw.
b. Ball screw bearing or nut wear.
c. Insufficient lubrication between the lead screw and the nut.
a. Servo motor failure:
b. There is dirt inside the grating scale.
c. The servo amplifier is faulty.
2. The workpiece is cooled and deformed after processing.
This is basically unavoidable. Pay attention to the use of coolant during processing and pay attention to the deformation of the workpiece after cooling.
Second, avoidable factors:
In fact, most of the actual machining errors are caused by unreasonable machining processes, and the basic machining processes are guaranteed (such as “pre-roughing, first-faced rear holes, first large-faced small faces” or fixtures in milling CNC machining” Reduce the number of clamping times, try to use the combination of fixtures and other basic processing technology details, to minimize the machining error caused by iron filings on aluminum parts, because the aluminum parts are very soft, the excluded iron filings can easily cause machining errors in aluminum parts. . For example, in the FANUC or Central China Machining Center, the deep hole should be used as much as possible with the G83 command, so that the iron filings can be discharged instead of the G73 command.
2. Cutting three elements: cutting speed vc, feed rate f, cutting depth ap and tool compensation
In simple terms, under the premise of ensuring the processing quality and tool wear, the adjustment parameters fully exert the cutting performance of the tool, so that the cutting efficiency is the highest and the processing cost is the lowest.
In the CNC lathe, there are also factors such as cutter head wear compensation.
3. Numerical calculation in manual programming and automatic programming
I don't know if the main question is manual programming or automatic programming. In manual programming, it is common to calculate errors. However, most of the production is now automatically programmed, so this part is just a reminder.
4. There is another point. Inaccurate tool setting and inaccurate tool setting are also factors that cause dimensional error. Therefore, try to choose a good edge finder. If the machine has an automatic tool aligner, it would be better. If there is no edge finder, Try it out.