three-line machining center everyone knows the complexity of cnc machining centers (such as different cnc machine tools (including linear rail machining centers, hard rail machining centers, mold machining centers, gantry machining centers, drilling and tapping machines, etc.) these machine tools do not they are exactly the same, and they also use different materials and are equipped with different tools. for example, our drilling and tapping machine has 16 knives, while the linear rail machining center is generally equipped with 24 knives. besides, the machining center there are also different cutting methods, different parameter settings, etc.), which determines that a long period of time must pass from engaging in cnc machining (whether machining or programming) to reaching a certain level. this manual is written by xiangyu precision machinery laboratory. some experiences summarised by engineers in the long-term actual production process on cnc machining technology, procedures, selection of commonly used tool parameters, and monitoring during processing are available for your reference.
1. q: how to divide the processing procedure?
answer: the division of cnc machining process can generally be carried out according to the following methods:
(1) tool centralized sorting method is to divide the process according to the tools used, and use the same tool to process all the parts that can be completed on the part. doing the rest of the way they can with the second knife, the third. this can reduce the number of tool changes, compress the idle time, and reduce unnecessary positioning errors.
(2) sorting method by processing parts for parts with many processing contents, the processing parts can be divided into several parts according to their structural characteristics, such as inner shape, outer shape, curved surface or plane, etc. generally, the plane and positioning surface are processed first, and then the hole is processed; the simple geometric shape is processed first, and then the complex geometric shape is processed; the parts with lower precision are processed first, and then the parts with higher precision are processed.
(3) for the parts that are prone to machining deformation by the roughing and finishing sequence method, due to the possible deformation after roughing, it is necessary to correct the shape, so generally speaking, for roughing and finishing, the process should be separated. .
to sum up, when dividing the process, we must flexibly grasp the structure and craftsmanship of the parts, the function of the cnc machining center machine tool, the number of cnc machining contents of the parts, the number of installations and the production organization of the unit. it is also recommended to adopt the principle of process concentration or the principle of process dispersion, which should be determined according to the actual situation, but must be reasonable.
two. q: what principles should be followed in the arrangement of the processing sequence?
answer: the arrangement of the processing sequence should be considered according to the structure of the part and the condition of the blank, as well as the need for positioning and clamping. the key point is that the rigidity of the workpiece is not damaged. the sequence should generally follow the following principles:
(1) the processing of the previous process cannot affect the positioning and clamping of the next process, and the general machine tool processing process interspersed in the middle should also be considered comprehensively.
(2) first carry out the inner shape and inner cavity processing process, and then carry out the outer shape processing process.
(3) the process of processing with the same positioning, clamping method or the same tool should be connected to reduce the number of repeated positioning, the number of tool changes and the number of times of moving the platen.
(4) for multiple processes carried out in the same installation, the process with less damage to the rigidity of the workpiece should be arranged first.
three. q: what aspects should be paid attention to when determining the workpiece clamping method in the cnc machining center?
answer: the following three points should be paid attention to when determining the positioning datum and clamping scheme:
(1) strive to unify the benchmarks of design, technology, and programming calculation.
(2) minimize the number of clampings, and try to process all the surfaces to be processed after one positioning.
(3) avoid using the manual adjustment scheme of occupying the machine.
