Because the rigidity of used machining centers directly affects the productivity of the machine tool and machining accuracy, the machining speed of machining centers is much higher than that of ordinary machine tools, and the motor power is higher than the machining speed of ordinary machine tools. The same specifications of ordinary machine tools, the rigidity of the structural design is much higher than that of ordinary machine tools. Orders can be checked against the values provided by the manufacturer for allowable torque, power, axial force and maximum feed force according to process requirements. In order to obtain a high degree of rigidity in a machine tool, it is not usually limited to the size of the part, but rather to select a machine tool that has one or two dimensions relative to the size of the part.
2, used machining center machining accuracy
Machining accuracy, directly affect the quality of your product, many people in the denial of the accuracy of your machine tool does not work, it will directly affect the buyer's decision. To note that machining accuracy and machine tool accuracy are two different concepts. The positional accuracy on the manufacturer's samples or product certification as the machining accuracy of the machine tool is wrong. Sample or certificate of conformity indicated on the positional accuracy is the accuracy of the machine itself, while the machining accuracy is the entire process system, including the permissible error of the machine itself, the sum of the error generated by various factors. When selecting the type, the evaluation method of process capability kp can be referred to as the basis for selection of accuracy. Generally speaking, the calculation result should be greater than 1.33.
3, used machining center CNC system selection
Numerical control system is the core of the machining center operation, CNC function is divided into the basic function and select function. Basic functions are unavoidable, only when the user selects these functions, the selection function is available to the manufacturer. The functions of the CNC must be selected according to the performance requirements of the machine tool. When ordering, it is necessary to order all the functions needed and not to miss them, while avoiding the waste caused by the low utilization rate, and also pay attention to the correlation between the functions. In the available CNC system, the performance level varies greatly. Should be based on the need to choose, not one-sided pursuit of high indicators, so as not to cause waste. Multi-machine selection, as far as possible, choose the same manufacturer's CNC system, so that the operation, programming, maintenance are more convenient.