The standards that the base of small and medium-sized CNC vertical lathes should meet
The base of small and medium-sized CNC vertical lathes is the basic support for all Y-axis components, usually used to place main components such as sliding rails. In order to better meet the requirements of high-speed operation, high production efficiency, high reliability, high precision, and high automation technology for CNC machine tools, and at the same time, compared with general machine tools, this machine tool needs to have better static and dynamic bending stiffness, as well as good vibration resistance. The key provisions for its base are pointed out at five levels.
1. High strength and wear resistance: The base of this machine tool has sufficient compressive strength when resisting external loads without exceeding the allowable deformation conditions. However, it is still important to pay attention to the compressive strength of locations with very large external loads and minimal deformation regulations. For the position where the base and theme activity components touch, i.e. at the sliding rail, there is a specified wear resistance.
2. It should have sufficient static and dynamic bending stiffness, including the structural bending stiffness of the base, partial bending stiffness, and contact bending stiffness. Effective measures should be taken to achieve a high bending stiffness mass ratio.
3. Good heat resistance: For machine tools, heat resistance has become an obvious issue, and it is necessary to reduce the thermal deformation of the machine tool in design or reduce the harm of thermal deformation to production and processing accuracy.
4. High precision and continuity of accuracy: There are many production surfaces for installing components and sliding rail surfaces for moving components on the base, and the accuracy of these surfaces themselves and their mutual parts is highly regulated and can be maintained for a long time. In addition, when cutting, production and processing, all dynamic and static loads are usually transmitted to the base of the machine tool, which is due to the complex bearing force on the base. Therefore, in order to ensure the accuracy of mutual parts or relative velocity between components, in addition to achieving the accuracy of geometric specifications, it is also necessary to meet technical standards in static and dynamic bending stiffness, vibration resistance, and heat resistance.
5. The dynamic bending stiffness immediately reflects the activity characteristics of the base: in order to better ensure that the base has a high ability to resist deformation and resist forced and self-excited vibration under alternating load effects, and at the same time, reasonable measures such as increasing vibration reduction and resonance frequency can be used to reduce co vibration and noise caused by thin arm vibration.