| 摘要 |
PURPOSE:To straighten by heating the quantity of weld strain down to a press quantity and to improve the efficiency in the operation for straightening for a carriage frame, by assembling right and left side beams and a cross beam to an H shape, pressing the assembly with press ram devices provided with pressure gages disposed on both sides of the side beams and welding the assembly. CONSTITUTION:Side beams 2, 2 and a cross beam 3 are placed in an H shape on a positioner 8. The rams 17, 17 of the cylinders 15, 15 of a ram device are advanced to press the side faces of the axle spring seats 6 of the beams 2, 2 by pressing force Q so that the beams are held in the state of applying prescribed elastic strain toward the outside. The butt parts of the beams 2, 2 and the beam 3 are welded to assemble a carriage frame. The beams are pressed in this state in such a way that welding strain is generated in the beams 2, 2 and the seats 6 return the rams 17 into the cylinders 15. The value of Q+Q' is registered on pressure gages 18 if the pressing force is designated as Q'. When the carriage frame is heated with gas torches 7 to straighten from the weld zones, the value Q+Q' decreases gradually. The heating is stopped at the point of the time when the value decreases to the initial value Q. When the pressing force of the rams is released, the strain by the force Q restores the original strain and the weld strain is straightened. |
