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Key introduction to the knowledge of pipe bender manufacture

Key introduction to the knowledge of pipe bender manufacturers

From the analysis of the process, it can be seen that the common bending pipe defects are the following kinds of situations: the arc section becomes flat and severe (elliptical), the outer wall of the arc thinning is too large, the outer arc bending crack, the inner arc wrinkling and bending rebound, etc.With the difference of the radius of the bend, the first four kinds of defects are produced in different ways and parts, and do not want to be produced at the same time, and the elastic rebound of the bending workpiece can not be stopped.The existence of pipe bending defects will have a great negative effect on the quality of pipe bending fittings.The thickness of the pipe wall becomes thin, and the ability of the pipe fitting to bear internal pressure is certain to decrease, which affects its utilization performance.On the one hand, the distortion of the shape of the bending pipe section probably causes the decrease of the cross-sectional area, thus increasing the resistance of fluid movement, and on the other hand, it also affects the efficiency of the pipe fitting in the layout.Wrinkling of the inner wall of the pipe will not only weaken the strength of the pipe, but also easily cause uneven speed of the moving medium, produce eddy currents and accumulate dirt at the bending parts, which affect the normal use of the bending pipe fittings;The springback sign must make the bending Angle of the pipe greater than the predetermined Angle, thus reducing the bending process accuracy.Therefore, the corresponding steps should be accepted before bending to prevent the occurrence of the above defects, so as to obtain the desired pipe fittings and ensure the performance indicators and surface quality of the products.In a normal environment, the following steps can be taken to address the common defects mentioned above:

(1) deal with circular arc lateral flat severe pipe fittings, with no core when bending die compaction plan into has anti deformation slot: the layout of the situation in a core pipe bending, should choose to conform to the mandrel (when need can be accepted by many segmental mandrel assembled flexible mandrel), accurate placement, and settles in mould guaranteeing each axis tube slot on the degree of unity.

(2) the thinning of the outer side of the arc in the small radius bending pipe is determined by the bending process characteristics, and it can not be stopped.Useful to stop thinning amount is too large, the commonly used method is to use the side with a booster device or tail pushing device of intermediate frequency pipe bending machine, through the booster or pusher offsets the department when the pipe bending resistance, improvement on the pipe cross section stress diffuse yan state, make the outward flow of neutral layer, thus to eliminate the pipe of the lateral wall thinning amount of goals.

(3) to deal with the curved and cracked environment outside the pipe arc, the first should ensure that the pipe material has excellent thermal disposal penalty state, and then check whether the pressure of the pressing die is too large, and adjust the pressure to make it proper, and finally should ensure that there is excellent lubrication between the mandre and the pipe wall, in order to eliminate the bending resistance and the friction between the inner wall of the pipe and the mandre.

(4) To deal with the wrinkle on the inside of the arc, the corresponding pace should be accepted according to the wrinkle position.If the front cutting point is wrinkled, the mandrel position should be adjusted forward to reach the reasonable support of the pipe elbow: if the back cutting point is wrinkled, the anti-wrinkle block should be installed, so that the anti-wrinkle block placement position is accurate, and the pressure die force is adjusted to the proper;If the inner side of the arc is full of wrinkles, it is clear that the diameter of the mandrel used is too small, so that the gap between the mandrel and the wall of the pipe is too large, probably the pressing force is too small, can not make the pipe in the bending process is very good and the bending mold and anti-wrinkle block fit.Therefore, the mandrel should be replaced and the compression die should be decompressed so that the compression die force is appropriate.

(5) To deal with the sign of bending rebound, it is important to adopt compensation method and correction method to control it.Compensation method is through the comprehensive analysis of the influence factors of bending rebound, according to the bending of the conditions and rebound trend, estimate the size of the amount of rebound in advance, in the planning of manufacturing die, correct convex and concave die things department size and how much shape, to achieve "positive" bending.Calibration method is in the mold layout to accept the pace, so that the correction force meets at the corner, change the stress state, and strive to eliminate the elastic deformation, reduce the rebound.For example, in the tensile bending process, tension is applied at the same time, so that the whole section is under the action of tensile stress. When unloading, elastic revival and deformation bias are equal, which can significantly reduce the amount of rebound.

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