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闪光对焊加热过程的特点与电阻对焊相比较是不连续的。闪光焊机的动板运动如能适应这一不连续性,即应与触点的瞬时过程相一致,闪光过程的稳定性和加热效率就会进一步提高。本文对闪光加热的这种不连续性进行了分析对比,提出了以触点实际过程为基础的瞬时调节方案。根据这一方案设计了相应的闭环电液伺服控制系统。这一系统的试验结果表明,闪光过程的稳定性大为提高,实现了动板宏观送进自动适应工件闪光烧化速度的增长,焊机不再需要预先给定运动方式和送进曲线。由于加热效率大幅度提高,闪光比功率可降低至常规送进法所需比功率的十分之一,对节能有重要意义,已经用这一方法为工厂生产了成批刀具,使用情况良好。
The characteristics of the flash butt welding process are not continuous with the resistance butt welding. Flashed welder moving plate movement to adapt to this discontinuity, that is, should contact with the instantaneous process is consistent, flash process stability and heating efficiency will be further enhanced. In this paper, the discontinuity of flash heating is analyzed and compared, and the instantaneous adjustment scheme based on the actual contact process is proposed. According to this scheme, the corresponding closed-loop electro-hydraulic servo control system is designed. The experimental results of this system show that the stability of the flash process is greatly improved, and the macro feed of the moving plate is automatically adapted to the increase of the flashing speed of the workpiece. The welding machine no longer needs to preset the movement mode and the delivery curve. Due to the dramatic increase in heating efficiency, the flash specific power can be reduced to one-tenth the specific power required by the conventional feed method, which is of great importance to energy saving. This method has been used to produce batch cutters for the factory in good condition.