Commissioning of FN-250 steel drum automatic seam welding machine (3) Tan Xinhua, 3602 Factory of the Chinese People's Liberation Army Third, the debugging of the "Z" track (1) Reasons for adjusting the "Z" track The method of cutting steel plates in our factory is the same as that of most domestic and foreign barrel manufacturers. That is, first cut a long side on the large shearing machine to obtain the required width of the ship. Then, the long side (called the original side) is cut and the two short sides are cut to obtain the length dimension that meets the process requirements. The steel plates used in our barrels are mainly domestic hot-rolled steel sheets. The original side has irregularities such as a wave shape and a waist drum shape. Therefore, the selection of the defective original edge as the positioning reference for the cutting is bound to make the finished product inconsistent with the vine art requirements in terms of dimensional accuracy. Both the length and width dimensions and the diagonal error may be out of tolerance. In shape, it may not be a rectangular shape required by the process, and it is probably a parallelogram or an irregular trapezoid. According to the instructions, we know that the edge of the automatic welder is between 2 and 3 mm. Since the edge value is much smaller than the manual semi-automatic welding barrel body edge value (generally above 10 mm). In view of the unsatisfactory size and shape of the shearing plate, the barrel bell mouth defect is not easy to eradicate, and increasing the edge width is beneficial to the above-mentioned defects to be "repaired" to a certain extent, and the weld bead strength is also advantageous. (2) Adjustment of the "Z" track Analysis of the structure of the "Z" track, we can know that adjusting the thickness of the vertical wear strip in the "Z" track can adjust the width of the weld edge. Accordingly, we removed two vertical wear strips at the weld nose, measuring 5mm in thickness, and the weld edge corresponding to this thickness was 3mm. For this reason, if the width of the lap is increased from the existing 3mm to 4mm, the thickness of the wear strip should be changed to 4.5mm. To increase the width of the lap to 5mm, the thickness of the wear strip should be reduced to 4mm. This type of push. We set the width of the lap to 5mm, and add 2mm to the two welding nose strips with a thickness of 4mm. After the installation, the test welding, from the weld seam, the front edge of the weld is obviously widened to more than 6mm, but to the rear end of the weld, the edge is rapidly reduced, so that the barrel is obviously flared. After careful observation and analysis, we believe that the reasons for the above defects are as follows: Since we only thinned the anti-wear strip at the welding nose (the thickness was changed to L1), the thickness of the anti-wear strip on the "Z" rod did not change (still The original thickness L2), because L2> L1, causes a step in the "Z" orbit at the intersection of the welding nose and the "Z" rod. Thus, when the front end of the barrel enters the waist roll, it is subjected to the force of the left and right waist rolls, so that the two short sides of the barrel are in contact with the AC and BD, and the short side of the bottom is in contact with the AC (on the upper side). Short side - solid line contact with BD). Thereby, the front end of the barrel body is wider and the back side is narrower. Under the restraint of the waist-shaped roller, the barrel body maintains this "deformity" into the welding wheel for welding, thereby obtaining a barrel with a distinct trumpet shape (see Fig. 8). Figure 8 "Trumpet" genetic map 1- lower welding nose wear strip; 2-lower welding nose; 3-"Z" rod lower part; 4-"Z" rod lower wear strip; 5--up welding nose wear strip; Accordingly, we believe that the reason for the obvious flare is the steps at A and B. To this end, we have also thinned the vertical wear strip on the "Z" rod. For the rear section of the "Z" track, the method of thinning the vertical wear strip was also prepared. However, after careful analysis of the structure, we found that the upper and lower parts of the section are independent of each other, and each can be moved away or close by the racehorse. The movement of the "Z" track centerline. Therefore, without loosening the new wear strips, we loosen the bolts 6 and 8 in Figure 5, shifting the upper joint plate to the right by 1 mm, the lower joint plate by 1 mm to the left, and then tightening 6 and 8, that is, The purpose of adjusting the "Z" track was achieved. After adjusting the "Z" track according to the above method, test several barrels and observe the weld. It can be seen that the weld edge is about 5mm, and the front and rear ends are close to each other. In the chapter "Adjusting the Waist Roller", we said that with the existing FN-250 welder structure, it is impossible to fundamentally eliminate the bell mouth. The reason can be explained by Figure 9. O1O1 - welding wheel center line; O2O2 - waist roll center line; F1 lower barrel side force direction, applied by right waist roll. The direction of the force on the upper side of the F2 is applied by the left waist roll. Figure 9 "Trumpet" can not eradicate the reason map As can be seen from Figure 8, according to the design requirements, the center line of the welding wheel and the center line of the waist roll have a distance requirement of 20 mm. After the actual measurement, the distance of the end of the "Z" track from the center line of the welding wheel is 35mm left cloth, that is, the center line of the waist roll leads the end of the "Z" track L1 = 15mm. Thus, after the front end of the barrel body exits the end of the "Z" track, 15 mm is advanced into the waist roll. Entering the barrel of the waist roll will be subject to force. Otherwise, the guiding and aligning action of the waist roll will not be exerted, and the setting of the waist roll will become redundant. At this time, the rear end of the barrel is basically in an unconstrained state. The moment exerted by the left and right waist rollers on the barrel body relative to the end of the "Z" track will cause the front end of the barrel body which has been out of the "Z" track and is in a suspended state. The speaker shape shown in 9. Theory and practice show that in the case of certain L1, the larger the F1 and F2, the more obvious the shape of the barrel horn. In the case of F1 and F2-, the longer the L2, the more pronounced the flare. Since the position and contour of the waist roll are fixed, at the center line of the waist roll, the barrel edge will maintain a certain value (larger than the "Z" track limit edge value). The barrel moves out of the centerline of the centerline of the waist roll, and the value of the edge will continue to increase (to "hold" the bell shape) until the front end of the barrel enters the welding wheel for welding. The "rigid" fixing of the lap size by the weld is at the front end of the barrel, and the lap edge maintains the maximum value in the lap. From the front end to the end, the width of the lap is gradually reduced. As the welding is completed, a trumpet-shaped barrel is finally obtained. Knowing the cause of the bell mouth, we can assume that if the front end of the barrel enters the welding wheel, the restriction effect of the "Z" track on the back side of the barrel disappears, that is, the back of the barrel is also in a suspended state, then the back of the barrel is Under the calibration and restraint of the waist roller, the width of the lap edge will be consistent with the front end, but this imaginary is not true due to the existence of the "Z" track. In order to maintain the front and rear edge, we can make the barrel evenly restrained by the waist-like roller in the length direction, so as to prevent the edge of the barrel from being affected by the waist roller moment. At the same time as the trend, the back of the barrel has a tendency to decrease. However, to achieve such a restraining effect, the pump mechanism is particularly cumbersome if the center line of the waist roll is moved back to the "Z" track range. (Of course, you cannot move the axis of the welding wheel forward, otherwise the waist roller will be lost), so that the barrel body will not be in a suspended state when it enters the waist roller, so as to avoid the misalignment of the barrel edge value, which requires butt welding. The machine structure has undergone major changes. From the chapter "Adjustment of the Waist Roller", we know that it is not necessary to unilaterally pursue the absolute consistency of the lap width before and after the weld. Therefore, we do not need to make a big move to eradicate the Lakou. From the above analysis, we can see that because of the limited ability of the "Z" track to restrain the barrel, and because of the existence of the waist roll, only the barrel edge at the end of the "Z" track is the "real price" setting. value. In Figure 9, the end of the "Z" track is to the left, the edge is wider than the set value, and at the end of the "Z" track is to the right, the width of the edge will be less than the set value. It can be seen that for the FN-250 welder, the position of the waist roller and its function are the main reasons for the bellows to be produced. From theory and practice, we also know that although the bell mouth is not easy to eradicate, we can adjust the position of the three waist rollers on their axial planes to make them suitable, so that the bell mouth tends to be inconspicuous. In this way, we can get the barrel that meets the requirements of the subsequent process, and the front and rear edges are close to each other. (3) Some precautions when adjusting the "Z" track: 1. At the joint of the wear-resistant strip, there should be no steps, especially the upper step, that is, the wear-resistant strip near the welding wheel is higher than the wear-resistant strip away from the welding wheel to avoid the occurrence of the card barrel. Observe whether there is a step in the "Z" track. You can use the steel saw blade to move in the "Z" track. Through the feel, you can judge whether there is a step at the joint of the wear bar. In order to avoid the occurrence of steps, it is better to increase the chamfer of the short side of the wear strip when processing the imitation strip. The choice of anti-wear material should be carried out according to the requirements of the drawings. 2. After widening the welding lap, the shearing size of the barrel should be adjusted accordingly to ensure that the inner diameter of the barrel is constant. 3. Care should be taken during the removal of the wear strip. 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6-lower welding nose; 7-"Z" rod upper part; 8-"Z" rod upper wear strip; L1-solder wear strip thickness; L2- middle section wear strip thickness