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CNC machine tool processing

Solve the problem of inaccurate and unstable aluminum materials encountered in CNC machine tool processing

When processing aluminum materials, CNC machining often encounters the problem of unstable processing. Explored what to do when metal processing encounters aluminum. Under the premise of processing aluminum materials, the overall summary can be summarized as the following two points:

Avoidable factors

Processing technology
Most of the machining errors are caused by the unreasonable machining process. It is necessary to ensure the basic machining process (such as “rough first and then finish, face first and hole, first large face and then small face” in milling CNC machining, or “reduce installation” in the use of fixtures. On the basis of the number of clamping, try to use basic processing details such as modular fixtures) to minimize the processing errors caused by iron filings on aluminum parts, because aluminum parts are very soft, and the removed iron filings can easily cause processing errors on aluminum parts.

Three elements of cutting
Cutting speed vc, feed f, cutting depth ap and tool compensation
This aspect is really difficult to elaborate. In simple terms, it is to adjust the parameters to give full play to the cutting performance of the tool under the premise of ensuring the processing quality and tool wear, so that the cutting efficiency is the highest and the processing cost is the lowest. In CNC lathes, there are also elements such as tool head wear compensation.

Numerical calculation in manual programming and automatic programming
In manual programming, calculation errors are also common, but now most production is automatic programming.

Inaccurate tool setting is also a factor that causes dimensional errors. Try to choose a good edge finder. It is better if the machine tool has an automatic tool setting device. If there is no edge finder, try cutting. This is the operating experience.


Stability of the machine tool
If it is not a new machine tool or the machine tool has undergone a lot of processing without debugging, there will be dimensional errors caused by the machine tool itself. The following factors cause the error of the machine tool itself:

Mechanical aspects:
There is looseness between the servo motor and the lead screw.
Worn ball screw bearings or nuts.
Insufficient lubrication between screw and nut.

Electrical aspects:
The servo motor is malfunctioning.
There is dirt inside the grating ruler.
The servo amplifier is malfunctioning.
Cooling deformation of workpiece after processing
This is basically unavoidable. Try to pay attention to the use of coolant during processing, and pay attention to the deformation of the workpiece after cooling when performing on-site measurement.

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