From the above drilling and milling thread compound tool, it can be seen that the application of the circumferential milling principle can also combine various machining processes such as milling, milling and milling end face with other machining processes to form a variety of different composite tools. For example, the boring and reverse chamfering, boring and milling ring grooves, boring and milling planes, and boring and milling threads are integrated into one tool for machining.
In the past, when it was necessary to perform chamfering, boring and grooving grooves, and boring and threading on the back of a workpiece, it is often necessary to use two or more tools for the two processes. Completion, if several functional surfaces require high positional accuracy for each other or in order to save the number of processing stations on the combined machine automatic line, it is necessary to use a controlled tool with complicated structure for processing.
For example, for the hinge hole that needs to be chamfered at the hole at both ends of the link, a composite cutter capable of circumferential milling can be used for processing, and the composite cutter is successively rough-finished--------- Chamfer at the upper and lower ports (by circumferential milling). Here, it should be pointed out that for the chamfering of the back side of the hole, it is often difficult to recombine with the boring process according to the conventional processing method, and the circumferential milling method is used, and when the chamfering is performed at the upper and lower ports of the hole, the composite tool only This chamfering can be achieved by moving a distance in the radial direction and performing circumferential milling by interpolation of the machine's X-axis and Y-axis.
Another example is the processing of the ring groove on the brake bracket. The ring groove in the hole can also be processed by circumferential milling. For this purpose, the bore can be combined with the milling groove. Process with a tool. Such a composite tool performs roughing in order to perform roughing—semi-finishing, fine-finishing—circumferential milling ring grooves (circular interpolation through the X-axis and the Y-axis). Here, the same is also achieved by circumferential milling to concentrate the grooving that is difficult to process the composite into a tool.
As can be seen from some of the machining examples listed above, machining tasks such as boring, tapping, threading, cutting the inner groove, cutting the outer groove, boring and chamfering, etc., can be carried out by conventional machining methods. The circumferential milling method is used to optimize the machining process, and modern CNC control technology and multi-axis high-dynamic machine tools (machining centers) provide conditions for the replacement and optimization of these processes, so that the past relies entirely on complex mechanism actuation ( Some machining tasks that can be realized with special tools such as eccentric drive, pull rod drive and centrifugal force actuation, now the tool can be circularly processed by the interpolation function of the control system, which not only simplifies the tool structure, but also optimizes the machining process. .
The promotion of the circumferential milling process and its composite tool not only shortens the basic time and auxiliary time, but also optimizes the machining and improves the machining accuracy of the workpiece.
In order to better apply the circumferential milling process, the selection of the machine tool and the design and manufacture of the tool should be emphasized when planning the production process of the workpiece. For machining tasks with high workpiece accuracy requirements, high dynamic machining centers or high dynamic milling centers should be used. Thanks to its direct drive and fast CNC control system, this machine has high dynamic response. However, traditional machining centers use indirect transmissions (such as screws and other mechanisms), which will produce transmission gaps and errors. The tracking error will be caused by the hysteresis of the mechanical transmission system during the interpolation movement. The fast CNC control system used in high dynamic machine tools ensures extremely fast response speed and makes full use of the dynamic characteristics of the feed axis for accurate movement, thus greatly improving multi-axis interpolation accuracy and machining accuracy. Improving tool manufacturing accuracy is another necessary condition for improving the accuracy of circumferential milling. For example, some tool manufacturers use CNC 5-axis EDM machines to improve the accuracy of diamond circumferential milling tools to ensure the shape accuracy of the tool (up to ±3μm). In addition, in order to improve the cutting conditions of the circumferential milling tool, the tool manufacturer adopts a tangential arrangement of the indexable insert on the cylinder of the milling cutter to form a positive rake angle, thereby reducing the radial cutting force. It is beneficial to improve the shape accuracy of the machined hole.
It can be seen that with the dynamic performance of the machine tool and the interpolation accuracy (nano-interpolation), the further improvement of the tool technology and its manufacturing precision, and the cooperation between the user and the tool manufacturer, in the future, the circumferential milling process will be obtained. Better promotion and application.
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