A thermal shrinkage forming method of a variable cross-section rectangular tube C-beam

Abstract

The invention provides a thermal shrinkage molding method of a C-shaped beam of a variable cross-section rectangular pipe. The method comprises the following working procedures: (1) carrying out equivalent drawing-down, namely, heating the two ends of a seamless round tube by an intermediate frequency furnace, and then making the two ends of the round tube into conical tubes, wherein the small end is arranged outside; (2) carrying out variable drawing-down, namely, heating the conical tubes at the two ends of the round tube by the intermediate frequency furnace based on the working procedure (1), and making the conical tube at each end into two sections of continuous conical tubes with different taper angles; (3) processing the middle part by square pushing, namely, enabling the circular tube in the middle part to be rolled into a square tube in a forced way by a square pushing machine; (4) pressing the two ends to be square, namely, pressing the two sections of conical tubes with different taper angles at the two ends into two sections of tubes which have different taper angles and rectangular cross sections; and (5) carrying out whole bend molding, namely, pressing the whole tube into a C-shaped beam body. The molding method is fewer in working procedures, high in production efficiency and high in product quality stability.

Description

Technical field [0001] The invention relates to a processing and forming method of a variable section beam, in particular to a heat shrinkage forming method of a variable section rectangular tube C-shaped beam. Background technique [0002] With the development of society and economy and the progress of science, people's living standards have been continuously improved. Traveling is the main choice for most people to improve their quality of life. However, because most tourist attractions are mostly in mountainous areas or mountain villages, trains, high-speed trains, and high-speed railways are often not directly accessible. Self-driving travel costs are high, routes are unfamiliar, and tickets are high, which makes travel very inconvenient. Therefore, group travel by passenger car is the best choice. [0003] At present, with the improvement of the level of science and technology, the technical equipment capabilities of passenger cars continue to improve to meet the increasing ne...

AI Technical Summary

Problems solved by technology

[0007] 1. There are many processes, including cutting, stamping, edge cutting, welding, and grinding;

[0008] 2. There is a lot of machining surplus material, which takes up a lot of equipment and time, and the material utilization rate is low;

[0009] 3. The production efficiency is low, it is not easy to realize process production, and the production batch is limited;

[0010] 4. The precision is low, the cutting and welding are all done manually, and the product consistency is difficult to guarantee;

[0011] 5. The quality of welding is difficult to guarantee. Due to the use of two butt joints, the welding butt joint gap, weld thickness, and molten pool depth are not easy to grasp, and the metallurgical reaction in the molten pool cannot be controlled by workers, resulting in a greater possibility of random fractures;

[0012] 6. Ultrasonic flaw detection takes a lot of time, and there is a lot of repair work after welding defects;

[0013] 7. The self-weight of the beam body is relatively large. In order to improve the safety and reliability factor, the material must be thickened to improve its fracture resistance, but it will bring problems such as increased weight, slow speed of passenger cars, and poor fuel economy.

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