Because vmc cnc is far more expensive than general machine tools, it is subject to more constraints, and the choice of machine tools is more important. The correct selection is the key to making good use of the machining center and making the machining center effective. When purchasing a machining center, it is particularly important to check these five key points carefully:
1 Stiffness of vmc cnc
Since the rigidity of CNC machining center directly affects the production efficiency and the machining accuracy of the machine tool, the machining speed of the machining center is much higher than that of ordinary machine tools, and the motor power is also higher than that of ordinary machine tools of the same standard, so the rigidity of its structural design is also much higher than that of ordinary machine tools. machine tool. When ordering, check calculations can be performed according to the technological requirements, the maximum agreed torque, power, axial force and feed force, and the values provided by the manufacturer. In order to obtain the high rigidity of the machine tool, it is often not limited to the size of the part, but a standard machine tool that is 1 to 2 larger than the part size is selected.
2 Machining accuracy of vmc cnc
Machining accuracy will directly affect product quality. When many people question the accuracy of machine tools, they will directly affect the buyer's decision. Keep in mind 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 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, and the machining accuracy is the sum of the errors produced by various elements of the entire process system including the errors allowed by the machine tool itself. When selecting models, you can refer to the identification method of process capability kp as the basis for selection of accuracy. Generally speaking, the calculation result should be greater than 1.33.
3. Selection of vmc cnc CNC system
Numerical control system is the central brain of CNC machining center operation. Numerical control functions are divided into fundamental functions and selection functions. The basic functions must be supplied, and the selection functions will only be supplied by the manufacturer after the user selects these functions. The function of the numerical control system must be selected according to the function requirements of the machine tool. When ordering, the required functions must not be lost, and at the same time, to prevent the low utilization rate from being corrupted, but also to pay attention to the correlation between the functions. In the numerical control system that can be chosen, the function concavity and convexity are very different. You should choose according to your needs, and you can't one-sidedly pursue high goals, so as not to constitute a waste. When selecting multiple machine tools, use the same manufacturer's CNC system as much as possible to make operation, programming, and repair more convenient.
4 Number of coordinate axes and linkage axes
Both the number of coordinate axes and the number of linkage axes should meet the requirements of typical workpiece processing. The number of coordinate axes is also one of the signs of the machine level. Under normal circumstances, for machine tools of the same manufacturer, same standard, and equal precision, adding a standard axis will increase the cost by about 35%. Although increasing the number of axes can strengthen the function of the machine tool, in the end it is necessary to pay attention to the process requirements and the balance of funds.
5 Automatic tool change equipment and tool magazine capacity
The selection of automatic tool change equipment primarily considers tool change time and reliability. Short tool change time can increase the production rate, but the tool change time is short. Generally, the tool change equipment has a messy structure, high failure rate, and high cost. Overheating emphasizes that the tool change time will greatly increase the cost and increase the failure rate. According to statistics, about 50% of the failures of CNC machining centers are related to automatic tool change equipment. Therefore, under the premise of meeting the application requirements, try to select highly reliable automatic tool change equipment to reduce the failure rate and the cost of the whole machine. The working quality of the automatic tool change and the capacity of the tool magazine will directly affect the function and quality of the machining center. The capacity of the tool magazine is to meet the requirements of a messy machined part for tools.
