Today, I brought you how to make the workpiece more accurate when the machining center is processing. Let's take a look at it. Any processing equipment, such as processing road setting, processing programming, processing tool selection, and machine tool itself during workpiece processing. , When there are problems with clamping problems and workpiece materials, they will have a certain impact on the final processing accuracy and processing efficiency of the workpiece. As a high-precision and efficient processing equipment, the vertical machining center is the most commonly used method to reduce workpiece processing errors. Original error method, error compensation method, error transfer method, error grouping method, error uniformity method and error synthesis method, etc.
1. The error synthesis method eliminates the error of the machine tool itself is the most important way to ensure the final machining accuracy of the workpiece. The error synthesis method requires the measurement of the original errors of each axis of the machine tool. The laser interferometer is the primary testing instrument for vertical machining centers because of its high measurement accuracy and flexible application.
2. Error compensation method Error compensation method is to artificially create an error to offset the original error inherent in the process system, or use an original error to offset another original error, and then achieve the improvement of the machining accuracy of the vertical machining center. intention. Generally, the gap of the machine tool is reduced, the rigidity of the machine tool is improved, and the preload is selected to cause the pre-tightening force of the relevant cooperation to eliminate the effect of the gap. It can also improve the rigidity of the workpiece and the tool to reduce the overhang length of the tool and the workpiece, so as to improve the rigidity of the process system. You can also choose reasonable clamping methods and processing methods to reduce the cutting force and its changes, reasonably select tool materials, increase the rake angle and entering angle, and perform reasonable heat treatment on the workpiece materials to improve the processing performance of the materials, etc. Several ways.
3. Direct reduction of the original error method The direct reduction of the original error method refers to an attempt to directly eliminate or reduce the primary element of the original error that affects the machining accuracy. For example, after a long-term use of a vertical machining center, the transmission system caused by natural abrasion will cause misalignment and reverse gaps.
4. Error uniformity method The error uniformity method is to compare and correct each other between closely related surfaces, or use each other as a benchmark for processing, in order to achieve the intention of eliminating processing errors in the vertical machining center.
5. Error transfer method The essence of the error transfer method is the summary error caused by the transfer process system's assembly error, force deformation and thermal deformation. For example, when the vertical machining center performs some hole processing, the coaxiality of the workpiece is not guaranteed by the rotation accuracy of the machine tool spindle, but by the fixture. When the machine tool spindle and the workpiece are connected by floating, the original error of the machine tool spindle will no longer be Affect the machining accuracy, and transfer to the fixture to ensure the machining accuracy.
6. Error grouping method In the vertical machining center processing, because of the existence of process blank errors, the processing errors of this process are formed. The change of the blank error has two main influences on this process: reaction error and positioning error. If the above error is too large, the machining accuracy cannot be ensured, and it is not realistic to improve the accuracy of the blank or the machining accuracy of the previous process. At this time, the error grouping method can be selected, that is, the blank or the upper process scale is subdivided into n groups according to the error, and the error of each group of blanks is reduced to 1/n of the original, and then the relative orientation of the tool and the workpiece is adjusted according to each group. Adjust the positioning components so that the scale and dispersion scale of the entire batch of workpieces can be greatly reduced. The essence of the error grouping method is to use the means to improve the measurement accuracy to make up for the lack of processing accuracy, and then to eliminate the impact of processing errors.