CNC, 3D printing, sheet metal and other processes, professional production of a variety of metal, plastic hand model.



What problems should be considered in CNC machining tool to make the size stable in machining?

May 24,21

What problems should be considered in CNC machining tool to make the size stable in machining?

In CNC operation, if we want to keep the size stable when processing aluminum parts, we need to consider the following two categories:
1Force Majeure:
1. machine itself stability. If the machine tool is not new or the machine tool has been processed in large quantities and has not been debugged, the dimension deviation caused by the machine itself may occur. The factors that cause the machine tool deviation are as follows:
Mechanical aspect: a. the servo motor and the screw are loose. b. Ball screw bearing or nut is worn.   c. Insufficient lubrication between the screw and the nut. Electrical aspect: A. servo motor failure.   b. There is dirt inside the grating ruler.   c. Servo amplifier failure.
2. the heat expansion and contraction deformation of the workpiece. The deformation of the workpiece after processing is unavoidable. Therefore, we should pay attention to the cooling effect and increase the frequency of measurement in the machine, and pay attention to the deformation of the workpiece after the cooling.
2Avoidable factors:
Processing technology   To control the machining error, it is necessary to have a reasonable processing process. In the process arrangement, the basic processing technology (such as "coarse first, fine first, first surface and hole, large surface and small surface" or "reducing clamping times and using combination fixture" in the use of fixture) shall be ensured, We all know that aluminum parts are very soft, and the scrap removed is very easy to make the aluminum parts produce processing errors.
2. cutting three elements: cutting speed VC, feed F, cutting depth AP and tool compensation in this respect. In a simple way, it is to adjust cutting parameters under the premise of ensuring tool wear and machining quality, so that the cutting performance of the tool can be fully exerted, so that the cutting efficiency reaches the highest and the processing cost is the lowest.   In CNC lathe, the factors such as tool head wear compensation need to be considered.
3. in manual programming, the error in the calculation process is very common. Although it is almost automatic programming, if you encounter the situation of manual programming, you should pay more attention to it.
4. accurate tool alignment.
If the tool alignment is not accurate, it will also cause the size error. Therefore, the edge finder should choose better as far as possible. If there is any condition, it is better to equip the machine tool with laser tool counter to ensure the accuracy of the tool alignment. If there is no edge finder and no conditions, only the simplest method of cutting is available!