The Design And Research Of Control System Used In Laser Truing And Dressing Grinding Wheels Based On Laser Sensor

As a non-contact method based on the thermal mechanism of melting and gasification, dressing and truing grinding wheel by laser is a promising technology to dress and true grinding wheel. Which avoids the affection of the force, and can remove the abrasive and binder simultaneously. But how to improve the precision and efficiency of dressing process is the key issue to be resolved. To achieve high precision and efficiency,the control system is studied in this paper.In accordance with the control of laser dressing and truing process, a real-time control system which adopted high-precision laser displacement sensor as measure device and adopted high-speed C8051F021 single-chip microcomputer as the core of calculation processing and control was designed in this paper. The system which based on principle of triangulation, adopts the method which can detect and ablate in synchrony. The input signal is the topographic signal of the object collected by the high-precision laser displacement sensor. The input signal can control the acousto-optic Q-switched Nd:YAG pulsed laser via the control block, and thus effectively control the laser ablation ablation treatment for dressing grinding wheel dressing process. From the hardware and software design to describe the system, Through the coordination of hardware and software, the entire control system realized the function of using TTL to control the Nd:YAG laser laser great pulse the launch or not, A great pulse laser is launched. corresponded the high spot of grinding wheel , and it does not launch to the low points .Secondly, this article analyzes the disruption in the process of system operation. In order to reduce the detection of signals be effected by the stability of the laser, the testing laser is separated from the working optical . Which can enhance the stability of the whole system and the precicsion of the grinding wheel. Considering the external interference and internal interference in the operation process of the control system, the power supply filtering, pre-amplifier circuit and the main control circuit are separated to reduce interference of PCB layout and routing components anti-interference in the design of the circuit. Redundant instructions, software traps, "Watchdog" technology, software filtering technology, as well as the speed of CPU instruction execution are used in the design of the Software. Narrow-band optical filter is used in the Measurement system.Finally, a series of optimal parameters such as the laser average power, pulse repetition rate, the axial machine automatically feed rate, wheel speed are selected. A carbide-bonded diamond grinding wheel is trued by acoustic-optic Q-switched Nd:YAG laser validate the controlling device can control the emitting of Q-pulse laser and gain perfect precision of dressing. A non-contact measurement method is used to measure the accuracy of grinding wheel before and after dressing,and stereomicroscope is used to analyze the finished grinding wheel surface topography. The research results show that uniform distribution of the abrasive grains, a large number of the static abrasive grains, obviously protrude out the base of the abrasive grains are achieved on the surface of grinding wheel after truing and dressing. The abrasive grain surface is rounded mainly revealed as follows: surface of abrasive grains is even; Several seamed edges have round sharp blade so as to form cutting ability.; The bond still keeps holding force to diamond- abrasive grains; Ductile truing and dressing vestige can be observed obviously on abrasive grains. Consequently, trued and dressed grinding wheel has a good grinding performance.