Machining accuracy and efficiency are the two most important factors for machining center users. Many people report that in normal machining operations, the machining efficiency is low when the workpiece accuracy is high, and the workpiece accuracy cannot be guaranteed when the machining efficiency is high. Can we take these two points into consideration at the same time?
In fact, it is possible. In addition to the high configuration and high performance of the machining center itself, we must also pay attention to the selection and installation of the tool, the setting of the machining route, the reasonable selection of the cutting amount, the programming skills and the rapid control of accuracy.
First, The correct selection and installation of tools
Regardless of whether it is a common machine tool or CNC machining center, the tool directly acts on the workpiece.
Second, Set up machining routes reasonably
The machining route and sequence are important foundations for optimizing the programming of the machining program, and are generally considered in terms of the feeding method and machining trajectory. In the process of CNC milling of workpieces, it is necessary to select a suitable feeding method in accordance with the technological requirements of the workpiece to ensure the cutting accuracy and machining efficiency.
When milling the outer contour of a flat workpiece, the cutting-in and cutting-out routes of the tool should be arranged correctly. Try to cut in and out along the extension of the contour curve to avoid milling marks at the junction. At the same time, forward milling or reverse milling should be selected according to the workpiece in the milling process.
Third, Reasonable choice of cutting amount
The cutting amount of the machining center is an important part of the CNC machining process. The size of the cutting amount is an important parameter of the machining center movement and feed movement. It has a profound impact on the machining accuracy and efficiency of the workpiece and even the wear of the tool. The basic principle is: when the stiffness of the workpiece allows, the roughing takes a larger cutting depth, back-feed amount and feed amount. For fine machining, a smaller cutting depth is generally selected to obtain a higher surface quality.
Fourth, Programming skills
Programming is the basic work to realize CNC machining, and it is also the soul of CNC machining. The quality of the workpiece machining programming directly affects the final machining accuracy and efficiency of the machine tool.
1. Flexible use of main programs and subprograms
In the processing of complex molds, a single mold with multiple pieces is generally used for processing. Generally, the subprograms is repeatedly called on the main program until the machining is completed
2. Cumulative error cannot be ignored
The error of the machining center actually does not refer to the error of one workpiece completion, but the error after completing batch machining. At present, the incremental method is generally used to program the workpiece, which is processed based on the previous point. In this way, the continuous execution of multiple sections of the program will inevitably generate a certain cumulative error.
Therefore, it is best to use absolute programming when programming, so that each program segment is based on the workpiece origin, so that the cumulative error of the CNC system can be reduced and machining accuracy can be guaranteed.
I believe that in the future, when considering the accuracy and efficiency of machining centers, you can start from the above four aspects. With the rapid development of the machining center industry, it will be more convenient and easy to take into account coexist the accuracy and efficiency of machining centers in the near future.
