cnc metal milling engraving machine

What precision horizontal machining center do I need—— Selection of precision

The accuracy grade of the machining center is mainly determined according to the accuracy of key parts of typical parts. Its accuracy mainly includes positioning accuracy, repeated positioning accuracy, and milling accuracy, especially the repeated positioning accuracy. It reflects the positioning stability of the coordinate axis and is the basic index to measure whether the axis works stably and reliably. It is particularly noteworthy that a comprehensive analysis must be carried out during model selection and ordering, and the precision values listed in the product samples cannot be simply looked at, because the meaning of values varies with different standards, different specified values, and different detection methods. The allowable positive and negative values (generally positive and negative 0.05) of unit length listed in publications, samples, and certificates of conformity are often unclear.

Special attention should be paid when ordering. It must be clear whether it is IOS (International Organization for Standardization), VDI (German standard), JIS (Japanese standard), nmtba (American machine tool manufacturers association standard), NAS (American Standard) and GB (Chinese standard), etc, Then, the test calculation methods and test environmental conditions specified in various standards are analyzed, to avoid misunderstanding.

Milling accuracy is one of the main indexes to comprehensively evaluate the servo following motion characteristics of the NC axis and the interpolation function of the NC system in the horizontal machining center. No matter whether the typical parts have this need or not, this index must be paid attention to meet the possible needs in the future and better control the accuracy.

Special attention should be paid to the difference between machining accuracy and machine tool accuracy. It is wrong to regard the position accuracy on the manufacturer's sample or product certificate as the machining accuracy of the horizontal machining center. The position accuracy indicated on the sample or certificate is the accuracy of the machining center itself, and the machining accuracy is the sum of errors caused by various factors of the whole process system, including the allowable error of the horizontal machining center itself. The cause of the error of the whole process system is very complex, and it is difficult to express quantitatively by a linear relationship. During model selection, the evaluation method of process capability coefficient CP can be referred to as the basis for model selection of machine tool machining accuracy. In general, CP should be greater than 1.33.

Several high-precision horizontal machining centers in the station: mh-630b, LH-300a, mh-500b, and th500 movable column horizontal machining centers have good performance.

Which CNC system should I choose—— Selection of numerical control system

The functions of a CNC system are divided into basic functions and selection functions, which can be comprehensively measured from the aspects of operation mode, user function, control mode, driving mode, feedback mode, interface mode, detection and measurement, alarm, and prompt, fault diagnosis, etc. The basic functions must be provided, but only when the user selects the selected function, the manufacturer will provide and increase the price separately, and the price is generally high. In general, the functions of the CNC system must be selected according to the performance needs of the machining center.

When ordering, the required functions must be fully ordered without omission. At the same time, the waste caused by the low utilization rate should be avoided, and the correlation between various functions should be paid attention to. On the other hand, among the available CNC systems, such as the Siemens system, FANUC system, and domestic central China CNC system, the performance and price vary greatly, and the price of imported or domestic systems also determines the price. In general, the Frank system has a high cost-performance ratio, and the proportion of domestic horizontal machining centers is relatively high. Many horizontal machining centers in the station use Frank's CNC systems, such as the-800b and LH-500b. When selecting multiple horizontal machining centers, the CNC system of the same manufacturer shall be selected as far as possible, so that the operation, programming, and maintenance are more convenient.

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