CNC milling machine is a general milling machine developed on the basis of an automatic processing equipment, both the processing technology is basically the same, the structure is also somewhat similar. CNC milling machine is divided into two categories without a magazine and a knife library. One of the CNC milling machine with a magazine is also known as a machining center.
CNC milling in addition to the characteristics of ordinary milling machine processing, there are the following characteristics:
1, parts of the processing of strong adaptability, flexibility, and can be difficult to control the size of the contours of the shape of the parts, such as mold parts, shell parts, etc.
2, can be processed ordinary machine can not be processed or difficult to process the parts, such as the mathematical model described in the complex curve parts and three-dimensional surface parts of the surface;
3, can be processed once fixture positioning, the need for multi-channel processing of the parts;
4, the processing of high precision, stable and reliable processing quality, numerical control device pulse equivalent is generally 0.001mm, high-precision CNC system up to 0.1μm, in addition, CNC machining also avoid the operator's operational errors;
5, a high degree of automation, can reduce the operator's labor intensity. Is conducive to production management automation;
6, high production efficiency, CNC milling machine generally do not need to use special fixtures and other special equipment, in the replacement of the workpiece only need to call stored in the CNC device processing procedures, clamping tools and adjust the tool data can be, thus greatly reducing the production cycle. Second, CNC milling machine with milling machine, boring machine, drilling machine function, so that a high degree of concentration, greatly improving the production efficiency. In addition, the CNC milling machine spindle speed and feed speed are stepless speed, it is conducive to select the best cutting amount;
CNC milling machine in various forms, different types of CNC milling machine in the composition of the differences, but there are many similarities. Here to XK5040A CNC vertical lift milling machine as an example to introduce its composition. Ⅺ saw 040A CNC vertical lift milling machine with Ⅳ four 3MA CNC system, using all-digital AC servo drive. The machine consists of six main parts. The part of the bed, the milling part, the table part, the horizontal feed part, the elevator part, the cooling and lubrication part. Bed inside the layout is reasonable, with good rigidity, the base is equipped with four adjustment bolts, easy to adjust the level of the machine, cutting fluid tanker set in the machine seat inside. The
① cooling system. The cooling system of the machine is composed of a cooling pump, a water outlet pipe, a return pipe, a switch and a nozzle. The cooling pump is installed in the cavity of the machine tool base. The cooling pump draws the cutting fluid from the inner tank to the outlet pipe, The nozzle is sprayed and the cutting zone is cooled.
② lubrication system and the way. Lubrication system is composed of manual flow of oil pump, oil separator, throttle, tubing and so on. Machine using the cycle of lubrication, with manual lubrication pump, through the oil separator on the spindle sleeve, vertical and horizontal rails and three-way ball screw lubrication, in order to improve the life of the machine.
From the characteristics of digital control technology. As the CNC machine tools using a servo motor, the application of digital technology to achieve the work of the machine parts and movement of the order of movement of the direct control of the traditional machine tool transmission structure was canceled or partially canceled, and thus the mechanical structure is greatly simplified. Digital control also requires the mechanical system to have a higher transmission stiffness and no drive clearance to ensure the implementation of control commands and control quality. Simultaneously. As the computer level and control capabilities continue to improve, the same machine to allow more functional components at the same time the implementation of the required auxiliary functions have become possible, so the mechanical structure of CNC machine tools than traditional machine tools have a higher integration requirements.
From the requirements of the development of manufacturing technology, with the emergence of new materials and new technology, as well as market competition for low-cost requirements, metal cutting is moving toward cutting speed and accuracy is getting higher and higher, the production efficiency is higher and the system More and more reliable direction. This requires the development of CNC machine tools based on the traditional CNC machine tools more accurate. Drive power more, mechanical machinery dynamic 'static, thermal stiffness better, more reliable, able to achieve long-term continuous operation and as little as possible downtime.
Milling cutter diameter selection The selection of the diameter of the cutter varies depending on the product and the production batch. The choice of the tool diameter depends mainly on the size of the equipment and the size of the workpiece.
Face milling cutter to choose the scope of the milling cutter diameter of the main tool to consider the required power should be within the machine power range, but also the machine tool spindle diameter as the basis for selection. The diameter of the milling cutter can be selected according to D = 1.5d (d is the spindle diameter). In the mass production, but also according to the workpiece cutting width of 1.6 times the choice of tool diameter.
The choice of the diameter of the end mill should take into account the requirements of the workpiece size and ensure that the required power of the tool is within the rated power range of the machine. If the small diameter end mill, you should mainly consider the maximum speed of the machine can reach the minimum cutting speed of the tool (60m / min).
The diameter and width of the slot cutter should be selected according to the size of the workpiece and ensure that the cutting power is within the allowable power range of the machine tool.