Because machining centers are far more expensive than ordinary machine tools, they are subject to more constraints, and the choice of machine tools is more important. Correct type selection is the key to making good use of the machining center and making the machining center produce benefits. When purchasing a processing center, it is particularly important to carefully examine these five points:

The rigidity of the machining center

Because the rigidity of the machining center will directly affect the production efficiency and the machining accuracy of the machine tool, the machining speed of the machining center is much higher than that of the ordinary machine tool, and the motor power is also higher than that of the ordinary machine tool of the same specification, so the rigidity of its structural design is also much higher than that of the ordinary machine tool. When ordering, it can be checked according to the process requirements, the maximum allowable torque, power, axial force and feed force, and the values provided by the manufacturer. To obtain the high rigidity of machine tools, it is often not limited to the size of parts, but choose machine tools with 1 to 2 specifications larger than the size of parts.

The machining accuracy of the machining center

Machining accuracy directly affects the quality of your products. When many people deny that your machine tool accuracy is not good, it will directly affect the decision of buyers. It should be noted that machining accuracy and machine tool accuracy are two different concepts. It is wrong to regard the position accuracy on the manufacturer's sample or product certificate as the machining accuracy of the machine tool. The position accuracy indicated on the sample or certificate is the accuracy of the machine tool itself, while the machining accuracy is the sum of errors generated by various factors of the whole process system, including the allowable error of the machine tool itself. In model selection, we can refer to the evaluation method of process capability KP as the basis for precision model selection. Generally speaking, the calculation result should be greater than 1.33.

Selection of CNC system of machining center

CNC system is the core brain of machining center operation. CNC functions are divided into basic functions and selection functions. The basic functions are inevitable, and the manufacturer will provide the selection function only after the user selects these functions. The functions of the CNC system must be selected according to the performance needs of the machine tool. When ordering, we should not only order all the required functions but also avoid waste caused by a low utilization rate. We also need to pay attention to the correlation between various functions. In the optional CNC system, the performance varies greatly. We should choose according to needs, and we should not pursue high indicators unilaterally, to avoid waste. When selecting multiple machine tools, the CNC system of the same manufacturer should be selected as much as possible, so that the operation, programming, and maintenance are more convenient.

Number of coordinate axes and linkage axes

The number of coordinate axes and the number of linkage axes should meet the processing requirements of typical workpieces. The number of coordinate axes is also a sign of the grade of machine tools. Generally, for machine tools of the same manufacturer, specification, and accuracy, adding a standard coordinate axis will increase the cost by about 35%. Although increasing the number of shafts can strengthen the function of the machine tool, we should finally pay attention to the process requirements and capital balance.

Automatic tool changer and magazine capacity

The selection of tool-changing devices mainly considers the tool-changing time and reliability. Short tool change time can improve productivity, but the tool change time is short. Generally, the tool change device has a complex structure, high failure rate, and high cost. Overemphasizing the tool change time will greatly increase the cost and increase the failure rate. According to statistics, about 50% of the failures of the machining center are related to the automatic tool change device. Therefore, on the premise of meeting the use requirements, try to choose the automatic tool change device with high reliability to reduce the failure rate and the cost of the whole machine.

The working quality of automatic tool change and the capacity of the tool magazine will directly affect the performance and quality of the five-axis machining center. The principle of tool magazine capacity is to meet the needs of a complex machined part for tools.

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