Cold compression necking process of reducing short tube
A short tube cooling and shrinking technology, which is applied in the direction of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of waste of energy, difficult control of heating temperature, difficulty in controlling the wall thickness of small opening side pipes, diameter of pipe opening and forming, etc. , to achieve the effect of practical and simple process
Active Publication Date: 2012-07-25
包头市迅达供暖设备有限公司
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Problems solved by technology
But the heating temperature is not easy to control, and it is also difficult to control the wall thickness of the small port side, the diameter of the nozzle and the shape, and waste energy
Method used
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Embodiment
[0012] A round steel pipe with a diameter of 773 mm, a wall thickness of 12 mm, and a length of 650 mm is shrunk to a reduced-diameter short pipe with a diameter of 720 mm.
[0013] First prepare the mold, the inner wall of the outer tire 1 is a special-shaped circular tube, the inner wall of the outer tire is composed of a straight pipe section and a flared arc surface pipe section, the length of the straight pipe section is not less than the design of the straight pipe section at the small mouth end after the narrowing of the variable diameter short pipe length, the inner diameter of the straight pipe section is greater than the outer diameter of the necked end of the round steel pipe, and the difference between it and the outer diameter of the necked end is less than the design tolerance of the outer diameter of the necked end. The transition section between the straight pipe at the end and the straight pipe at the small opening coincides; the core tire 2 is in the shape of ...
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The invention relates to a cold compression necking process of a reducing short tube. The cold compression necking process is characterized in that a mould for the necking process comprises an outer mould and a core mould, wherein the inner wall of the outer mould is in an abnormal round tube shape and comprises a straight tube section and a flared cambered surface tube section; the core mould isin a circular truncated cone shape; and horizontal support plates are equidistantly arranged on the edge of the upper circumferential surface of the core mould according to the circumference. The necking process comprises the following steps of: placing the core mould in the outer mould; supporting the horizontal support plate on the edge of the outer mould; fixing the outer mould with an oil cylinder of a hydraulic machine; placing a metal round tube below the mould; starting the hydraulic machine to downwards press the outer mould; extruding the metal round tube by the outer mould to ensurethe metal round tube to start reducing and necking; and when the length of the straight section achieves the design requirement, stopping downward press by the hydraulic machine and then withdrawing the mould. In the invention, a cold compression forming technology is applied. The invention has the advantages of simple and practicable process, energy source saving, accurate necking, high precision and favorable forming performance.
Description
technical field [0001] The invention relates to a cold shrinking process of a short tube with variable diameter, which belongs to the field of shrinking processing of metal tubes. Background technique [0002] Reduced-diameter short pipes are widely used in reality, and the reduced-diameter short pipes are all made of straight pipes through shrinking. At present, there are two main processing methods for metal round pipe shrinkage: one is the spinning shrinkage method, and the other is the forming die extrusion method. No matter which shrinking method is used, after shrinking, the accuracy of the diameter of the small opening of the metal round pipe is difficult to guarantee, especially after the shrinking of large-diameter steel pipes, the diameter and molding of the small opening side are difficult to meet the design requirements, and the product rate is low. In order to improve the quality of necking and the pass rate of finished products, some people also embed electric...
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IPC IPC(8): B21D41/04B21D37/10
Inventor 赵铎
Owner 包头市迅达供暖设备有限公司