The CNC carving and milling machine

Engraving and milling machine rigid requirements of the moving parts is better as far as possible, while moving part of the rigid to flexible for the former title, to design some light as much as possible, while maintaining a certain rigidity. Such design of the CNC engraving machine can compare the fine finish, high machining accuracy, high speed machining for soft metal can, but because of the moving parts of poor rigidity, it is not possible for heavy cutting. So how to solve the moving parts from mechanical structure, light weight, good rigidity and contradiction, the key lies in the mechanical structure. This regard, we have some successful experience for reference: 1) Design is made of super wide column and beam, because of the gantry structure has excellent symmetry and excellent rigidity, it is the first selection of high speed cutting equipment structure. Compared with the traditional C type structure of lathe bed, portal frame in the form of a lathe bed high rigidity, average stress, axial movement, is only in a relative motion axis and low inertia, compact design precision, can ensure high rigidity, high precision and high dynamic characteristics. Machine tool can use 30 ° inclined beams structure, make the move to the rear of centre of gravity of the spindle and the saddle, and made the guide beam spacing increase as far as possible, so also can greatly improve the stability and rigidity of spindle. Due to post more quality than the quality of the moving parts such as the spindle, so for the high speed movement and spindle of machine tool cutting provides a solid guarantee for high speed and load. 2) Base using cast iron casting and become whole, USES the high and low reinforced with mesh box structure, or directly with the similar honeycomb mesh structure, the base must have a certain weight in order to increase the stability of the machine tool. Such high rigid base design can ensure the fixed worktable and props and saddle, spindle and other moving parts support rigidity, the stability of machine tool dynamic processing best, within the scope of whole journey fully supporting pillar, minimize the processing of deformation. 3) Moving parts and CNC milling machine significant difference is widened a lot of the distance between the guide and guide, in order to overcome the influence of negative torque. 4) As a result of the machine tool rigidity is mainly used to overcome moving parts in the high-speed mobile strong shocks for the moving parts, so the guide rail, screw some rough requirements, to strengthen the connection part of rigidity. In order to adapt to high speed and the double requirements of cutting load, X/Y/Z three-axis servo motor using higher precision of the elastic coupling connection and high precision ball screw pair, all of the guide rail and screw adopt high grade low coefficient of friction, high quality products of the hardening layer, not only ensure the overloading of the rigidity of machine tool and ensure the accuracy of the high-speed movement, ensure the machine under long-term continuous high-speed machining state in low wear and accuracy stable, save the user's maintenance costs. In a word, for CNC milling machine and CNC machining center, because the requirement of low speed high torque output, so be sure need to improve the spindle transmission torque reduction ratios of ascension, so low speed is inevitable, general CNC milling machine and CNC machining center's top speed of 6000 r/min, so is unlikely to use very small radius of tool. But for CNC engraving machine, the spindle is usually 2 ~ 30000 r/min to work, the rotation accuracy, generally about 2 mu, or cutting knife phenomenon will be very serious, so be sure to use electricity spindle or pneumatic spindle, spindle is one of the motor and fixed plate and spindle are generally use the light materials such as aluminum alloy. For high speed cutting equipment, invisible motorized spindle, and also to have certain torque when low speed, have the oil and water cooling machine keeps constant operating temperature of the spindle, spindle power in July. More than 5 ~ 8 kw, the speed more than 25000 r/min.