How to ensure machining accuracy when machining parts by machining center
The accuracy of the machining center will affect the quality of the machining. Today, we will consider the following aspects: machine selection, tool selection, processing plan, and program generation, etc., to ensure that the parts are processed without problems with processing accuracy.
1. The size of the workpiece is accurate, and the surface finish is poor: If the tool is not sharp after being worn or damaged, please re-sharpened or choose a better tool to re-calibrate the tool; the machine will resonate or place it unevenly, please adjust the level, Make a good foundation and fix it steadily. The cause of the machine crawling is the wear of the carriage guide rail and the wear or looseness of the ball screw. The machine tool should be maintained and the wires should be cleaned after getting off work, and lubrication should be added. Add in time to reduce friction; choose a coolant suitable for workpiece processing. If you can meet the processing requirements of other processes, please try to select a higher spindle speed.
2. The machining process of a certain workpiece has changed, and the dimensions of other machining are accurate: whether the parameters of the block are reasonable, whether they are in the predetermined trajectory, and whether the programming format meets the requirements of the manual. If the thread is confused and the pitch is wrong, it will be immediately related to the thread's peripheral configuration (encoder) and objective factors of function.
3. Each process of the workpiece has the phenomenon of increase or decrease programming errors; unreasonable system parameter settings; incorrect configuration settings. Mechanical transmission components have regular and regular changes and failures.
Solution: It should be checked whether the instructions used by the program are executed according to the track specified in the manual. You can judge by clicking on the dial indicator. Place the dial indicator at the beginning of the program, and whether the carriage returns to the beginning after the program ends. Repeat execution.
Check whether the system parameters are reasonably set or considered to have been changed; whether the configuration of the relevant machine tool meets the requirements for the connection and calculation of coupling parameters, and whether the pulse equivalent is accurate.
Check whether the transmission part of the machine tool is damaged, whether the gear coupling is uniform, check whether there are regular and regular failure phenomena, if there is, check the key parts and eliminate them.
4. Dimensional instability caused by the system: unreasonable system parameter settings; unstable working voltage. The system is affected by external interference, causing the system to lose synchronization. Add a capacitor, but the impedance between the system and the driver does not match, resulting in the loss of useful signals. The signal transmission between the system and the drive is abnormal.
Solution: Whether the speed, acceleration time is too large, whether the spindle speed and cutting speed are reasonable, whether the parameter modification of the operator causes the system performance to change. Install voltage stabilizing equipment, ground wire and ensure a reliable connection, add an anti-interference absorption capacitor at the pulse output contact of the driver. It is important to choose the right capacitor model. Check whether the signal connection line between the system and the drive is shielded, whether the connection is reliable, and whether the system pulse signal is lost or increased.
