《中频淬火电气控制系统设计》-毕业论文（设计）.doc

中频淬火电气控制系统设计 摘要：中频淬火是机械零件的生产过程必不可少的工序,它可以显著提高钢的强度和硬度,淬火的温度和升温速度及温度的稳定性将直接影响零件的残余内应力、强度、硬度和韧性配合的性能,因此淬火的温度稳定控制质量直接关系到整个零件的质量。本设计就是通过微机控制100KW淬火系统的温度，主电路采用交-直-交变频器，电流型并联谐振（8000HZ），控制电路采用AT89C51单片机来控制，主要过程是通过温度传感器将温度信号传送给信号放大电路，然后经模数转化送入单片机再经单片机显示和控制，从硬件到软件两方面实现温度的稳定控制。本设计具有接线简单、输出频率任意可调、功率因数高等优点。 关键词： 中频淬火 温度控制 变频器 AT89C51单片机 信号放大电路 Abstract: The medium-frequency quenching is an essential process for mechanical parts’ production , which can significantly improve the strength and hardness of steel. Quenching temperature and heating rate and temperature stability will directly affect the parts performance of the residual stress, strength, hardness and toughness, so the quality of quenching temperature stability control is directly influencing the quality of the entire part. This design is just through the computer system of 100KW to control its temperature, and the main circuit use AC - Direct - AC converter, current-mode parallel resonant (8000HZ),and control circuit use AT89C51 microcontroller to control, which the main process is through the temperature sensor signals transmitting to the signal amplification circuit. And then transformed into the microcontroller through the module and then displayed and controlled by the MCU, both from hardware to software to achieve temperature stability control. This design has the wiring simple, the output frequency of any adjustable, high power factor advantages. Keywords: IF quenching, temperature control, inverter, AT89C51 microcontroller, signal amplification circuit 目 录 1 引言………………………………………………………………1 2 总体方案设计思路………………………………………………4 3 总设计方案的确定………………………………………………5 3.1主电路的设计方案确定…………………………………………5 3.2控制电路的方案确定……………………………………………10 3.3保护电路的选择…………………………………………………11 4主电路设计…………………………………………………………12 4.1主电路参数计算与设计…………………………………………12 5控制电路的设计……………………………………………………16 5.1单片机的设计……………………………………………………17 5.2调理电路的设计…………………………………………………20 5.3驱动电路的设计…………………………………………………20 5.4键盘及显示电路…………………………………………………23 6温度控制……………………………………………………………25 6.1温度检测电路设计…