First of all, under the premise of aluminum material, the following aspects need to be considered:
　　 One, irresistible factors:
　　 1. The stability of the machine tool itself. 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:
　　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.
　　 The system parameters can be restored by PMC, so it is omitted.
　　 2. The workpiece is cooled and deformed 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.
　　 2. Avoidable factors:
　　1. Processing technology
In fact, most of the actual 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, first face and then hole, first large face and then small face" of CNC milling, or in the use of fixtures. Reduce the number of clamping times and try to use basic processing details such as modular fixtures) to minimize the machining errors caused by iron filings on aluminum parts. Because aluminum parts are very soft, the removed iron filings can easily cause machining errors. . For example, use G83 command as far as possible to make deep hole, so that iron filings can be discharged instead of G73 command.
    2. 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.
　　 3. Numerical calculation in manual programming and automatic programming
　　In manual programming, calculation errors are also common, but now most production is automatic programming.
　　4. Knife
　　 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.