Large-diameter steel pipe cold bending mode

, Die; (2) semi-circular cross-section is convex,adidas climacool schuhe, concave mold; (3) is semi-circular cross-section punch and round with a combination of two forming die to do the type. 56Hrfi-Ic ~ 18,adidas schuhe, ’, 1i9Ti analysis of three cases in Figure 1, although the type of plane lJ ~ x_ simple, but without being bound by curved steel pipe, steel pipe cross-section distortion seriously. Is semi-circular cross-section punch,adidas climacool, although able to inhibit the pipe cross-section of better distortion, but due to the processing and modification of the mold is very difficult. The combination to do with the forming die of the wheel type,adidas online shop, not only can inhibit the pipe cross-section of the deformation, and create a simple, easy to modify the radius of curvature of the mold, so I chose the third type. Mold structure shown in Figure 2. Dingmu 22. Love of chess with the use of the main advantages of application of the mold shown in Figure 2 cold bending steel, its main advantages are: (1) the same diameter of the pipe bending, forming round can be common, but according to two different bending radii adjustment shape wheel center distance B can be. (2) The pipe bending springback is difficult to grasp, sometimes under the pressure test to be the situation after the change of curvature radius of the mold, so that the structure of the steel pipe bending mode can only modify the punch. (3) forming wheel center distance B as adjustable (adjustment range is between 6o0 ~ 1700), which is equivalent with the same bending force generated when the cold steel of different calibration results, you can adjust the center distance and the B value The size of the pressure change P-value amount of springback,adidas neo, die radius of curvature to reduce the number of modified or not to modify the mold and can bend radius of curvature of qualified parts. In addition,adidas climacool hose, the pipe end of the first bend, forming wheel center distance adjustment was smaller, which saves material, while the middle part of the bending, forming the center distance adjustment wheel is as much, mainly because a large value of B, P value is comparatively small, so the surface quality of steel would have been better, or prone to indentation or imprint. (4) As the tube is in the mold section bending, repeated pressure type, similar to the bed plate in the shape or profile in the roll forming machine forming,adidas climacool chill, bending radius of the mold so it does not require very strict, sometimes different bending radii The pipe can be done in a mold. We actually bent parts in Figure l, a, b two kinds of parts is a mold forming, bending strength and the number of iterations is not the same. (5) make the use of the die forming round, shortening the production cycle, reduce costs,adidas la trainer, with the more obvious economic benefits. In the design of the mold is at the ideal state, that is the case of steel designed with resilience. In actual use this set of bending dies, the resilience of different types of steel. Figure l, a, c using the same mold with the curvature parts repeatedly bent through paragraph by paragraph, parts of the curvature radius of the basic line drawings. Figure l b and parts of the parts on a model with a just and repeated bending frequency of different products after cold drawing requirements to better meet the part d in Figure l after the first bend radius of curvature of the product out Figure large, flat and pipe cross-section changes are also more serious, later modified by the upper die bending radius, the modified R590 R500, the result of pressure after better meet the application requirements. Figure l rebound in several parts of different reasons, in addition to (the switch cover 4). 57f on the next page 57) the relative bending radius R / d different from other, mainly 1Cr18Ni9Ti and A3 two materials yield ratio / b different. As we all know, the smaller the yield ratio for almost all of the metal forming are beneficial, and for pipe bending, the small, that you can use a smaller bending deformation of the pipe, while the mouth is high, as the inhibition of rebound shaped bend of the pipe to the school, its cross-section deformation. In addition, / is low, the tube bending springback after unloading a small amount, in Figure 1, when the four parts bending also proved this point. 3, the conclusion (1) the use of two hydraulic machine is semi-circular shaped cross-section of the wheel and bending punch may be better to complete the pipe bending. (2) by adjusting the two center distance can change the amount of bending strength and resilience. (3) the smaller / bending of the pipe is very beneficial. (4) consider the rebound, punch bending radius can be larger than the bending radius of the smaller parts, but for / smaller material, punch bending radius of the bend radius and parts can be equal or close to Shenyang Nonferrous Metallurgical Machinery Factory new high-Zhong Jiang Products patented product – a new rigid hand, widely used, market demand, simple structure, superior performance by experts praise China won the silver medal Fourth Invention Exhibition, April 1990, thereby facilitating the 18th Geneva International Invention Exhibition Gold Award Welcome to negotiate the transfer of technology, particularly in the Northeast welcome business partners. Interested parties, please contact the editorial department. National unity ISSN CN-ll a 2-l322 Code Articles 1942

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. VI Conclusion

Li cards. The development of LSAW pipe mill proposal \[J\]. Pipe