Restriction boost type mould for introversive tube
A technology of boosting and turning the tube, applied in the direction of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of less actual use, low quality of turning tubes, and inability to guarantee production consistency, so as to improve the yield of turning tubes, The effect of improving the quality of the pipe turning and avoiding the instability of the pipe wall
Inactive Publication Date: 2009-06-03
CHONGQING UNIV
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Problems solved by technology
Its disadvantages are: the yield rate is low, because the tube billet has to bear a large axial pressure when it is turned over, when the axial pressure is greater than the critical yield pressure of the tube billet, it is easy to cause the instability of the tube wall and the failure of the tube turning
It is especially common in groove-shaped mold turning tubes with the largest friction force during forming; the turning quality is low and the accuracy is poor, because the flow of the rolled tube wall is free, so the coaxiality of the inner and outer tube walls after turning the tube Poor, can not guarantee the consistency of production
The stretching and turning process is complicated, the yield is low, and it is rarely used in practice
Method used
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[0026] The constraint-assisted inversion pipe mold for the No. 20 steel pipe blank with an outer diameter of 43mm, a wall thickness of 1mm, and a height of 100mm is described in detail as follows:
[0027] The invention includes an upper die, a tube blank, a constraint booster block, a pipe turning mold, a guide column, a guide sleeve, a fixing block of a pipe turning mold, a lower template, a support seat, a lever, a pressing rod, a pin shaft, an upper template, and a pin .
[0028] The upper die is a cylinder with an outer diameter of 85 mm. On the axis from the upper surface of the upper die to its bottom surface, there are round holes with a diameter of 33 mm and a height of 25 mm and a round hole with a diameter of 43 mm and a height of 8 mm. The round hole on the bottom surface of the upper die has a chamfering radius of 2mm, and the circle with a diameter of 60mm on the upper face of the upper die and the inner part of the upper die at the intersection of the horizontal...
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Abstract
The invention relates to a constraint boosting inversion pipeline mould that includes upper and down molding board, top die, tube blank, supporting base, guide pin bushing, inversion pipeline, constraint boosting block, boosting supporting block, compressed member, lever, pin and wrist. The constraint boosting block movably matches with the circular aperture in inversion pipeline mould. The boosting supporting block is movably located in the circular aperture of the inversion pipeline mould. The inversion pipeline mould is fixed on the inversion pipeline mould fixation block. Top die, inversion pipeline mould, constraint boosting block, and boosting supporting block are located on the same axis. One end of pin is fixed on the boosting supporting block and the other end is in the through-slot of one end of lever. The mould improves the yield and quality of inversion pipeline, and ensures the axiality of inner pipeline wall and outer pipeline wall.
Description
Technical field: [0001] The invention relates to an inversion stamping forming mold for metal thin-walled tubes. Background technique: [0002] At present, the double-layer pipes are manufactured by pipe turning forming mainly including axial pressure turning and stretching turning. The molds used in the axial pressure turning tube include conical mold, rounded corner mold and groove mold. The process is to place the tube blank on the mold, and force the edge of the tube blank mouth to turn over by means of axial pressure. Its disadvantages are: the yield rate is low, because the tube billet has to bear a large axial pressure when it is turned over, when the axial pressure is greater than the critical yield pressure of the tube billet, it is easy to cause the instability of the tube wall and the failure of the tube turning. It is especially common in groove-shaped mold turning tubes with the largest friction force during forming; the turning quality is low and the accuracy ...
Claims
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IPC IPC(8): B21D37/10B21D37/12B21D19/00
Inventor 温彤宋克飞陈霞
Owner CHONGQING UNIV