The impact of machine structure and configuration on price:
At present, the numerical control equipment on the market can be described as dazzling, how to economically and reasonably select the numerical control equipment suitable for the unit, which has always been the focus of selection. In addition to processing applications, machine tool prices are largely determined by the basic structure of the machine tool. The following should be noted:
1. Machine protection: It can be divided into full protection (double door), semi-protection (single door) and simple protection. This choice affects the operator's personal safety and use environment.
2. Machine bed: It can be divided into integral type and sub-assembly type. The former has better rigidity and precision retention, while the latter is slightly worse.
3. Spindle box and spindle motor: The spindle shifting system can be divided into mechanical manual shifting (lathe, lifting table milling machine), variable frequency motor plus mechanical manual 2-3 speed regulation, full variable frequency motor speed regulation and AC servo motor speed regulation, how to The choice should be made according to actual needs.
4. Tool holder (bit): According to the driving method, it can be divided into stepping and AC servo. According to the control mode, it can be divided into open loop, semi-closed loop and full closed loop. Here, we must pay special attention to the number of axes of multi-axis linkage of CNC machine tools. It has a crucial influence on the structure and control of the machine tool. In addition, when selecting, pay attention to the number of knives on the lathe and the number of knives in the machining center.
5. Main functional components: spindle bearing accuracy, ball screw accuracy, ball screw bearing accuracy, ball screw mounting method, the accuracy of the motion that can be achieved must be paid attention to.
6. When the machining accuracy of the machine tool is very high, the grating scale should be added to form a full-closed loop control (position signal feedback), which can improve the positioning accuracy and repeat positioning accuracy of the machine tool.
7. Other functions:
8. The appearance and shape of the machine tool, the quality of the paint: the equipment status of the machine tool manufacturer, the design ability, the processing technology level, the supply channel of the purchased product, the quality assurance system, the testing means, etc., will be reflected on the product, if necessary, the best Learn more.
4. Select according to the machining accuracy of the machine:
The machining accuracy requirements of the key parts of a typical part determine the accuracy level of the selected CNC machine. CNC machine tools can be divided into ordinary type and precision type according to the precision. Generally, there are 20 to 30 items of precision inspection items for CNC machine tools, but the most characteristic items are:
1. Single-axis positioning accuracy 2. Single-axis repeat positioning accuracy 3. Roundness (track) of the test piece processed by two or more axes
Among them, the general horizontal CNC lathe and CNC milling machine are common type, the positioning accuracy is about 0.020-0.030 mm, and the repeat positioning accuracy is about 0.010-0.015 mm. Full-function CNC lathes, turning centers, vertical machining centers and horizontal machining centers are generally precision type, with positioning accuracy of about 0.008-0.010 mm, repeatability of 0.003-0.005 mm, and ultra-precision CNC machine tools for special applications. Processing, its accuracy can reach 0.001mm or less.
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