When purchasing processing center need to pay attention to which points?

Because the machining center is far more expensive than ordinary machine tools, it is more restricted by more factors, and the choice of machine tools is more important. The correct selection is the key to make good use of the machining center and make it play a beneficial role. In the purchase of processing centers, it is particularly important to carefully examine these five points:

First, the stiffness of the machining center

Because the stiffness 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, the motor power is also higher than that of the ordinary machine tool with the same specification, so the stiffness of the structure design is much higher than that of the ordinary machine tool. When ordering can be according to the process requirements, allowable torque, power, axial force and feed force maximum value, according to the manufacturer to provide the value for checking calculation. In order to obtain the high rigidity of machine tools, often not limited to the size of parts, and choose the relative part size of 1 to 2 specifications of the machine tools.

Two, the processing accuracy of the processing center

Processing accuracy, directly affect the quality of your product, many people in the denial of your machine precision is not good, it will directly affect the decision of the buyer. It should be noted that machining accuracy and machine tool accuracy are two different concepts. It is wrong to take the position accuracy on the manufacturer's sample or the 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 produced by various factors of the whole process system, including the allowable errors of the machine tool itself. In the selection, we can refer to the evaluation method of process capacity kp as the basis of precision selection. In general, the results should be greater than 1.33.

Three, machining center CNC system selection

Numerical control system is the core brain of machining center operation. Numerical control function is divided into basic function and selection function. Basic functions are provided by necessity, and select functions are provided by manufacturers only after users have selected them. The function of the numerical control system must be selected according to the performance of the machine tool. When ordering, we should not only set the required functions, but also avoid the waste caused by the low utilization rate. We should also pay attention to the correlation between the functions. Among the CNC systems available, performance varies widely. Should be according to the need to choose, not one-sided pursuit of high indicators, so as to avoid waste. Multiple machine tool selection, as far as possible to choose the same manufacturer of numerical control system, so that the operation, programming, maintenance are more convenient.

Iv. Number of axes and linkage axes

The number of axes and linkage axes should meet the requirements of typical workpiece processing, the number of axes is also a mark of the grade of the machine tool. Under normal circumstances, the same manufacturer, the same specification, the same precision of machine tools, increase a standard axis, the cost of about 35%. Although increasing the number of axes can strengthen the function of the machine tool, it is necessary to pay attention to the process requirements and capital balance from the beginning.

Five, automatic tool changing device and tool storage capacity

The choice of tool changing device mainly considers the tool changing time and reliability. Short tool change time can improve productivity, but short tool change time, the general tool change device structure is complex, high failure rate, high cost, overemphasis on tool change time will significantly increase the cost and increase the failure rate. According to statistics, about 50% of the fault of the machining center is related to the automatic tool changing device, so on the premise of meeting the requirements of use, try to choose the automatic tool changing device with high reliability, in order to reduce the failure rate and the cost of the whole machine.

The working quality of automatic tool change and tool storage capacity will directly affect the performance and quality of machining center. Tool storage capacity to meet the needs of a complex machining parts for the principle of tools.