Briefly describe the six characteristics of CNC machining applied to tire molds

(1) The processing time of the workpiece is shortened. For the pattern ring of a tire mold, it takes 30 days if the casting technology is used, and 20 days if the electric spark technology is used. If the direct engraving mold is used for high-speed processing, it usually takes 10 days, which can greatly reduce the processing time.

(2) After the workpiece is clamped once, both rough machining and finishing can be carried out, and the treatment of pattern corners is more flexible and changeable. Tyre patterns are mostly small blocks and have many corners. All patterns can be carved out with a five-axis machining center with only one clamping.

(3) Due to the reduction of cutting force and cutting temperature, tool wear is reduced and service life is prolonged. The cost of the tool occupies a certain proportion of the cost of workpiece processing.

(4) CNC machining can be realized by cutting instead of grinding. Replacing the grinding process with the cutting process has the advantages of simplified tool structure, strong process flexibility, and energy saving, all of which reduce the processing cost of the workpiece. (Guide: Analysis of the influencing factors of the mold result on the production process)

(5) Compared with conventional processing technology, it can simplify processing procedures and reduce processing costs. Such as the processing of mold cavity, the conventional processing technology is: blank annealing, rough machining, quenching and tempering treatment, semi-finishing machining, electrode machining, electric discharge machining, manual polishing, etc. With the use of CNC machining technology, the machining process can be simplified as: rough annealing, rough machining, quenching and tempering, finishing, super finishing. In this way, the electrode manufacturing process is omitted, the production cost is reduced, the surface hardening problem caused by the electric discharge machining is also eliminated, and the artificial finishing process is reduced or eliminated.

(6) Improved processing quality. Because the excitation frequency of the tool cutting during CNC machining is far away from the natural frequency of the process system, it will not cause forced vibration of the process system, ensuring a better processing state. Due to the small cutting depth, cutting width and cutting force, the tool and workpiece are small in deformation and the accuracy of the size is maintained, and the cutting damage layer is thinned, the residual stress is small, and high-precision, low-roughness processing is realized. Analyzing the formation of frequency from the perspective of dynamics, it can be seen that the reduction of cutting force will reduce the amplitude of the vibration (ie forced vibration) caused by the cutting force; the increase of speed will make the working frequency of the cutting system far away from the natural frequency of the machine tool to avoid resonance. . Therefore, CNC cutting can greatly reduce the surface roughness and improve the processing quality.

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