> &Because machining centers are far more expensive than ordinary machine tools, there are more constraints, so it is more important to choose a reasonable machine tool. The correct selection is the key to make good use of the machining center and bring the machining center into full play. When purchasing a machining center, it is particularly important to study these five points carefully: & nbsp;
I. rigidity of 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. The order can be calculated according to the technological requirements, allowable torque, power, axial force and feed force, and checked according to the value supplied by the manufacturer. In order to obtain the high rigidity of the machine tool, it is often not limited to the size of the parts, but to choose the machine tool with a size of 1 to 2 specifications larger than the size of the parts.
2. Machining accuracy of machining center;
Processing accuracy directly affects the quality of your products. When many people deny that the accuracy of your machine tool is not good, they 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 regard the position accuracy on the manufacturers 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 itself, while the processing accuracy is the sum of the errors generated by various factors of the whole process system including the allowable errors of the machine itself. In the selection, the evaluation method of process capability KP can be used as the basis of accuracy selection. Generally speaking, the calculation result should be greater than 1.33.
Third, the choice of CNC system in Machining Center & nbsp;
Numerical control system is the core brain of machining center operation. The numerical control function is divided into basic function and selection function. The basic functions must be provided, and the selection function can only be provided by the manufacturer after the user selects these functions. The functions of the CNC system must be selected according to the performance requirements of the machine tool. When ordering, the required functions must be ordered completely without omission, and the waste caused by the low utilization rate shall be avoided, and the relevance between the functions shall be paid attention to. In the optional CNC system, the performance varies greatly. We should choose according to the needs, not to pursue high targets unilaterally, so as to avoid waste. When multiple machine tools are selected, the CNC system of the same manufacturer shall be selected as much as possible, so that the operation, programming and maintenance are more convenient.
4. Number of coordinate axes and linkage axes & nbsp;
The number of coordinate axes and linkage axes shall meet the processing requirements of typical workpieces, and the number of coordinate axes is also a mark of machine tool grade. Generally, for machine tools of the same manufacturer, specification and accuracy, a standard coordinate axis will be added, and the cost will increase about 35%. Although increasing the number of shafts can strengthen the function of the machine tool, attention should be paid to the process requirements and capital balance at the beginning and end.
V. automatic tool changer and magazine capacity;
The selection of tool changing device mainly considers the time and reliability of tool changing. Short tool change time can improve productivity, but short tool change time. Generally, the structure of tool change device is complex, the failure rate is high and the cost is high. Overemphasis on tool change time will greatly increase the cost and increase the failure rate. According to statistics, about 50% of the failures of machining center are related to automatic tool change device, so on the premise of meeting the use requirements, try to select automatic tool change device with high reliability to reduce the failure rate and the cost of the whole machine.
The quality of automatic tool change and the capacity of tool magazine will directly affect the performance and quality of machining center. The capacity of the tool magazine is based on the principle of satisfying the need of a complex machining part for the tool.
I. rigidity of 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. The order can be calculated according to the technological requirements, allowable torque, power, axial force and feed force, and checked according to the value supplied by the manufacturer. In order to obtain the high rigidity of the machine tool, it is often not limited to the size of the parts, but to choose the machine tool with a size of 1 to 2 specifications larger than the size of the parts.
2. Machining accuracy of machining center;
Processing accuracy directly affects the quality of your products. When many people deny that the accuracy of your machine tool is not good, they 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 regard the position accuracy on the manufacturers 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 itself, while the processing accuracy is the sum of the errors generated by various factors of the whole process system including the allowable errors of the machine itself. In the selection, the evaluation method of process capability KP can be used as the basis of accuracy selection. Generally speaking, the calculation result should be greater than 1.33.
Third, the choice of CNC system in Machining Center & nbsp;
Numerical control system is the core brain of machining center operation. The numerical control function is divided into basic function and selection function. The basic functions must be provided, and the selection function can only be provided by the manufacturer after the user selects these functions. The functions of the CNC system must be selected according to the performance requirements of the machine tool. When ordering, the required functions must be ordered completely without omission, and the waste caused by the low utilization rate shall be avoided, and the relevance between the functions shall be paid attention to. In the optional CNC system, the performance varies greatly. We should choose according to the needs, not to pursue high targets unilaterally, so as to avoid waste. When multiple machine tools are selected, the CNC system of the same manufacturer shall be selected as much as possible, so that the operation, programming and maintenance are more convenient.
4. Number of coordinate axes and linkage axes & nbsp;
The number of coordinate axes and linkage axes shall meet the processing requirements of typical workpieces, and the number of coordinate axes is also a mark of machine tool grade. Generally, for machine tools of the same manufacturer, specification and accuracy, a standard coordinate axis will be added, and the cost will increase about 35%. Although increasing the number of shafts can strengthen the function of the machine tool, attention should be paid to the process requirements and capital balance at the beginning and end.
V. automatic tool changer and magazine capacity;
The selection of tool changing device mainly considers the time and reliability of tool changing. Short tool change time can improve productivity, but short tool change time. Generally, the structure of tool change device is complex, the failure rate is high and the cost is high. Overemphasis on tool change time will greatly increase the cost and increase the failure rate. According to statistics, about 50% of the failures of machining center are related to automatic tool change device, so on the premise of meeting the use requirements, try to select automatic tool change device with high reliability to reduce the failure rate and the cost of the whole machine.
The quality of automatic tool change and the capacity of tool magazine will directly affect the performance and quality of machining center. The capacity of the tool magazine is based on the principle of satisfying the need of a complex machining part for the tool.