Type of CNC turning and milling

Turn-mill CNC machine tool is a typical high precision, high efficiency, high rigidity, high automation and high flexibility turn-mill compound center. Turn-mill compound CNC lathe is an advanced compound machine consisting of five-axis linked milling machining center and double spindle lathe. It provides a better solution for processing small parts with high precision, high quality and high complexity.
With the rapid development of science and technology in the world, many products are developing in the direction of precision, miniaturization and light weight. Many small precision CNC machine tools are often required to meet the needs of users. In the current Chinese machine tool products, there is a lack of such precision CNC machine tools. In addition to widely used in the watch industry, medical equipment, automotive parts manufacturing and other light industry, but also for aerospace, weapons, ships and other defense and military fields to process many precision special parts, such as flight control gyro, air-to-air missile inertial navigation and other zero position machine, is the market for small precision complex parts of high quality machine tools.

Turn-mill machining center has no special requirements for the machine tool, but must provide at least one Y-axis movement. The rotation of the workpiece provides the c-axis motion for the milling cutter to transfer the required feed rate (power). However, the cutting speed of the workpiece is measured using the IPM rather than the SPM of the lathe (this means that the workpiece is cutting at a much lower speed on the mill-turn machining center than it would during turning). But the y-axis motion is necessary because the milling tool has to do a lot of eccentric machining.

Also, when the tool is eccentric, it cannot machine to the desired part size because when the tool is centered, the center of the tool intersects the center of rotation of the part, so the tool can only cut with its end face (i.e., it cannot Cutting edge. To ensure that the cutting edge can cut correctly, the tool centerline must deviate from the part's center of rotation line to 1/4 of the tool diameter.


Turning and milling machining centers can effectively use the following three types of tools. The main reason is the use of wiper blades or scrapers. For end mills in turning and milling, large size flat or heavy interrupted cuts can be made. Blade end mills are used for step milling. Integral end mills are used for machining cylindrical parts and precision milling of deep and narrow grooves. Using the scraper structure of the above tools, it is possible to cut deep parts by two of the four cutting edges of the tool, thus achieving high efficiency and high precision machining.

However, using this method, problems occur when the tool approaches the sides of steps and recesses. In this case, the eccentric tool leaves many rounded corners on the surface of the part after machining. In order to remove these rounded corners, the tool must be machined again. In this case, the tool deviation is no longer required and the tool is moved along the Y-axis to the center of the part for machining. However, in some machining steps this machining allowance is not allowed (sometimes metal is not allowed).


One of the unsatisfactory facts of turning and milling center machining is the shape error of the machined part. When the milling cutter is milled around the part, some scalloped marks will inevitably form on the part surface at regular intervals. This error cannot be completely eliminated, but can be effectively controlled with a wiper blade. A trimming insert follows the other inserts so that the cutting edge is slightly convex in the width direction, so that the blade of the insert extends just to the surface of the part being machined, creating a new cutting surface with a slight scalloped trace smooth.