How to ensure the size stability of aluminum alloy parts in CNC machining?

Aluminum alloy parts in the processing process can not be separated from CNC processing, but in the CNC processing process must maintain the stability of the size of the workpiece to ensure the quality of aluminum alloy parts, so what specific aspects should be considered from? In the CNC machining of aluminum alloy parts, in order to maintain the stability of the size, we must start from the external and internal factors to analyze

1. The external factors influencing the dimensional stability, the stability of the machine tool under the condition of the machine tool is not new, after a large processing and not for maintenance debugging and maintenance, may produce a dimensional deviation due to the cause of the machine tool, in this case, the need for machine tool itself deviation causes were analyzed, and find out the problem, suit the remedy to the case.

2. The following points should be checked in the machine tool: whether the servo motor is loose between the lead screw; Whether the ball screw bearing or nut is worn; Whether the lubrication between the lead screw and the nut is sufficient; Whether the servo motor failure; Whether there is dirt inside the grating ruler; Whether there is a fault in the servo amplifier, and the deformation caused by thermal expansion and cold contraction of the workpiece.

3 workpiece after processing will appear thermal expansion and cold contraction deformation phenomenon, so in the processing should pay attention to observe the effect of cooling, increase the frequency of measurement in the machine, and pay attention to the cooling of the workpiece deformation and deformation degree.

4. While paying attention to the external factors affecting the dimensional stability, it is more necessary to strengthen the control of controllable factors such as processing technology to ensure the stability of the workpiece size.

5. In the processing technology, to control the processing error, in the preparation process, must follow the numerical control processing first rough after fine, first surface after hole, first large surface after small surface or fixture use to reduce the number of clamping, as far as possible to use the combination of fixture and other basic processing technology, while minimizing the aluminum chips caused by the aluminum processing error, Because the biggest problem in the processing of aluminum parts lies in the chip removal and deformation after cutting, the correct selection of tools, cutting fluid and cutting process can basically solve the chip removal problem.

6. In the process of aluminum alloy parts processing, on the premise of guarantee the quality of tool wear and processing, adjust the cutting parameters, which makes the cutting performance of cutting tool into full play, so as to improve cutting efficiency, reduce processing costs, factors such as wear of the cutting tools should be considered in addition to compensation, to minimize the error in calculation process in programming.

7. CNC machining process is the accuracy of the tool is also the main factor that causes the size error. Therefore, as far as possible to choose a better edge finder, it is recommended to equip the machine tool with laser tool alignment instrument, to ensure the accuracy of the tool alignment, and then to ensure the size stability of aluminum alloy parts.

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