Technological characteristics of diamond tool grinding
The grinding of diamond tools has its own technological characteristics, especially the high hardness of materials, which leads to the rapid loss of diamond grinding wheel in the grinding process and the instability of size. Second, the majority of diamond tools are turning tools or blades, and the grinding position relative to the machine tool is uncertain (such as the change of blade thickness), causing the change of grinding point. Third, the high resistance of grinding makes the process system composed of grinding wheel, cutting tool, clamping tool and machine tool produce relatively large elastic deformation, thus producing relatively large "let the knife" phenomenon
These three characteristics are the realization of automatic grinding of three "blocking land rover", directly affect the cutting tool after the die cutting dimensional accuracy. If not properly solved, it will inevitably lead to poor consistency of grinding size accuracy and roughness, low grinding efficiency and unsuitable for mass production. The application of voice control technology in diamond tool grinder can effectively solve these three problems.
Application of adaptive control technology in rough grinding
The main tasks of rough diamond grinding are: to improve the grinding efficiency, that is, to set the safe distance as little as possible, and to reduce the time of "grinding" air; Remove the grinding allowance as soon as possible within the range of machine tool stiffness. Find out as soon as possible that the grinding allowance has been removed (the sign is that the grinding resistance has been reduced to the minimum).
The intense acoustic wave generated by the friction between the diamond grinding wheel and the diamond tool is propagated on the process equipment. The monitoring of the acoustic wave can accurately reflect the grinding conditions, such as whether the tool contacts the diamond grinding wheel, whether the pressure between the tool and the diamond grinding wheel (i.e. grinding resistance) is eliminated, etc. If the control system can collect and analyze these information in real time, and make the machine tool control system adapt to it, it is no different from installing a sensitive ear to the machine tool, making the machine tool controller become a more intelligent adaptive system. In fact, the development of the system was also inspired by on-site workers sharpening knives.
In normal grinding, there are two situations in which the acoustic frequency has obvious characteristics, one is the moment of contact between the tool and the diamond grinding wheel, and the other is when the grinding reaches the final size (the grinding resistance decreases to the minimum), which is easy to understand. The former can be used as the end of fast feed and the dividing line of grinding feed; The latter can be used as a sign of grinding completion.
Even in cutting tools and diamond grinding wheel in the process of "close contact", can reflect the acoustic frequency changes of resistance between cutter and diamond grinding wheel, the "information feedback" to machine controller, adjust the servo feed speed, the grinding in a relatively "constant" under the force of complete, for improving the grinding efficiency, extend the life of the machine tool has great significance.