In order to make the dimensions of aluminum processing stable, what issues should be considered in CNC processing?

　　 In the CNC machining CNC home, if the aluminum parts are to be processed, the dimensions should be kept stable, then we need to consider the following two categories:

　　 One, irresistible factors:

　　 1. The stability of the machine tool itself.

　　 If the machine tool is not brand new or the machine tool has a large number of CNC machining and has not been debugged, the size deviation caused by the machine tool itself may occur. The following factors cause the deviation of the machine tool itself:

　　 Mechanical aspects:

　　A. There is looseness between the servo motor and the lead screw.

　　B. The ball screw bearing or nut is worn.

　　C. There is insufficient lubrication between the lead screw and the nut.

　　 Electrical aspect:

　　A. Servo motor failure.

　　B. There is dirt inside the scale.

　　C. The servo amplifier is malfunctioning.

　　 2. Thermal expansion and contraction deformation of the workpiece.

　　 The thermal expansion and contraction deformation of the workpiece after processing is unavoidable, so we should pay attention to the cooling effect during processing, and increase the frequency of on-machine measurement, and also pay attention to the deformation of the workpiece after cooling.

　　 2. Avoidable factors:

　　Cnc processing technology

To control the machining error well, it is inseparable from a reasonable machining process. When the process is arranged, in addition to ensuring the basic machining process (such as milling CNC machining "first rough and then fine, first face then hole, first large face then small In principle, the basic machining process details such as “face” or “reducing the number of clamping times and using modular fixtures as much as possible” in the use of fixtures should also minimize the machining errors caused by aluminum chips. We all know that aluminum parts are very It is soft, and the eliminated scraps are very easy to cause machining errors in aluminum parts.

　　 2. Three elements of cutting: cutting speed vc, feed f, cutting depth ap and tool compensation

　　In this regard, in simple terms, it is to adjust the cutting parameters under the premise of ensuring the tool wear and processing quality, so that the cutting performance of the tool can be fully utilized, so that the cutting efficiency is maximized and the processing cost is the lowest.

　　In the CNC lathe, there are also factors such as tool head wear compensation that need to be considered.

　　 3. Numerical calculation of manual programming

　　In manual programming, errors in the calculation process are very common. Although it is basically automatic programming now, if you encounter manual programming, you should pay more attention.

　　 4. The knife is accurate.

　　 Inaccurate tool setting will also cause dimensional errors. Therefore, try to choose a better edge finder. If possible, it is best to equip the machine with a laser tool setting instrument to ensure the accuracy of the tool setting. If there is no edge finder and no conditions, there is only the easiest way to try cutting!