Pipe truss example branch pipe F1, F2 intersecting line shape 0 branch pipe F1 local two-sided angle, groove angle and chamfer angle 1 branch F2 right side of the two sides of the angle, the groove angle and the chamfer angle 2 branch pipe F2 left side of the two sides folder It can be seen from the angle, the groove angle and the chamfer angle that since both sides of the branch pipe F1 are perpendicular to the main pipe, the shape of the intersecting lines on both sides changes relatively gently. It can be seen from 0 that the branch pipe F1 is at an angle between the two sides of the intersection with the main pipe at the circumference. The minimum value is 90b, and the maximum value is about 134b. If it is simply classified according to the angle between the local two sides, the branch pipe F1 is located in the side area along the entire circumference. The groove angle A should be determined according to the structural requirements of the detail B, thereby calculating the bevel angle B. It can also be seen from 0 that the branch pipe F1 has a relatively uniform change from 45b to 60b along the circumferential groove angle, and the bevel angle is uniformly changed from 15b to 45b, and there is no phenomenon that the bevel angle is drastically changed, which indicates that if the branch pipe is changed, When the angle between the main pipe and the main pipe is large (close to 90b), the intersecting line shape of the branch pipe, the groove angle A and the chamfer angle B are uniformly changed along the circumferential direction of the branch pipe. At this time, the intersecting line and the groove of the branch pipe It is easier to perform CNC cutting. The angle between the branch pipe F2 and the main pipe is 45b, and the right side of the branch pipe F1 is only intersected with the main pipe. It can be seen that the shape of the intersecting line on the right side changes uniformly; and the left side is not only intersected with the main pipe but also with the branch pipe F1. In the lap joint, the shape of the intersecting line on the left side of the branch pipe F2 is turned at the transition point with the branch pipe F1 and the main pipe, intersects the main pipe between the circumferences 110b and 250b, and the other regions intersect the branch pipe F1. It can be seen from 1, 12 that the minimum angle between the left and right sides of the branch pipe F2 and the main pipe (or F1 branch pipe) is about 45b, and the maximum value is about 145b. According to the angle between the two sides, the branch pipe F2 is along the whole. The circumference is located in the toe area, the side area and the transition area. The groove angle A should be determined according to the structural requirements of the details A, B and C, so as to calculate the chamfer angle B. It can be seen from 1 that the branch pipe F2 is along the right side of the circumferential slope. The mouth angle changes more evenly from 2215b60b, the chamfer angle changes between 4b60b, and there are several small turning points in the change process, but there is no phenomenon that the chamfer angle is drastically changed; as can be seen from 2, the left side of the branch pipe F2 The angle between the two sides of the circumference is larger than that of the right side, and the angle of the groove is also changed from 2215b60b, but the turning angle is obviously increased from the right side, the chamfer angle is changed from 4b60b, and the turning is more during the change. There is no chamfering yet. The phenomenon of sharp change of angle; this means that if the angle between the branch pipe and the main pipe is small (close to 45b), the intersecting line shape of the branch pipe, the groove angle A and the chamfer angle B vary unevenly along the circumferential direction of the branch pipe, when the branch pipe is in addition to the main pipe Externally, with other branches At this time, the intersecting line and the groove of the branch pipe are difficult to control when performing CNC cutting, and the CNC cutting machine torch has a swing phenomenon during the cutting process. Conclusion Based on the analysis of the welding technology specification of building steel structure 6JGJ81-2002 on the weld bevel angle and the shape of the groove of the joint of the steel pipe structure, referring to the technical requirements of the domestic CNC pipe intersecting wire cutting machine, A practical method for numerically controlled cutting of the weld bevel angle of a circular steel pipe structure. Through the data and cutting test, the calculation method of the groove angle of the circular steel pipe joints proposed for numerical control cutting is proposed in this paper. In most cases, the current domestic numerical control intersecting wire cutting machine can be used to cross the branches. The line and the groove are well cut. (Finish) Dry type peeling machine has high removal rate and high peeling efficiency, Wet type peeling machine has high removal rate and low bean breakage rate. 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Research on CNC Cutting Method of Steel Pipe Welding Slot
Pipe joint joint part penetration penetration weld detail C groove shape and size indication local two-sided angle W, groove angle A, bevel angle X, chamfer angle B as indicated above, in the existing CNC intersecting line cutting Under the condition of equipment and other equipment, it is difficult to carry out CNC cutting according to the requirements of groove type and groove angle specified by the regulations. Considering the relative continuity of the angle of the intersecting line groove and the angle of the beveling, this paper summarizes the phase for the phase according to the regulations. When the joint weld detail A and detail B use full penetration weld, the detail C and detail D use three types of welds (full penetration weld, partial weld penetration and fillet weld, partial penetration weld) When seams and fillet welds are collectively referred to as non-all-welded welds, the method of calculating the groove angle and the bevel angle according to the angle between the local two sides is used. In each case, the relationship between the angle between the branch pipe and the main part of the main pipe W and the groove angle A and the chamfer angle B is as shown in Fig. 7.