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Method for producing cold-formed steel of U-shaped davit arm

A technology of cold-formed steel and production methods, which is applied in the field of hot roll bending-stretching composite forming of U-shaped booms, can solve the problems of high-strength steel for plates, achieve the goals of reducing the yield point, expanding the strength level, and improving the forming performance Effect

Inactive Publication Date: 2014-03-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analyze the hot rolling process to solve the problem of simultaneous stretching and straightening of the sheet during the product forming process, as well as high-strength steel and large-radius springback, two key technical points that cannot be solved by traditional roll forming

Method used

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  • Method for producing cold-formed steel of U-shaped davit arm
  • Method for producing cold-formed steel of U-shaped davit arm
  • Method for producing cold-formed steel of U-shaped davit arm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] 1) Prepare a high-strength steel sheet with a length of 2000mm, a width of 200mm, and a thickness of 2mm. The front end of the sheet must have a certain slope; 2) The sheet advances in the roll at a feed speed of v=20m|min; The increase in the diameter of the rolls between times is 0.5 mm. 3) After the sheet passes through the first pass, an induction heating device is installed between the first and second passes, and the induction coil heats the sheet to a temperature of 500°C with power P, and the heating time is 10s; 4) Using 6 Each pass rolls the sheet material, and the bending angle of each pass is 12°→27°→45°→65°→81°→90° (this parameter is based on the conditions of the production equipment itself, and according to the formed The requirements of the product, such as surface quality, dimensional accuracy, etc., and the characteristics of the corresponding materials, such as the yield strength and tensile strength of the material, are given by the engineering and t...

Embodiment approach 2

[0043] 1) Prepare a high-strength steel sheet with a length of 2000mm, a width of 200mm, and a thickness of 2mm. The front end of the sheet must have a certain slope; 2) The sheet advances in the roll at a feed speed of v=15m|min; The increase in the diameter of the rolls between times is 0.5 mm. 3) After the sheet passes through the first pass, an induction heating device is installed between the first and second passes, and the induction coil heats the sheet to a temperature of 700°C with power P, and the heating time is 15s; 4) Using 6 Roll forming is performed on the sheet material in each pass, and the bending angle of each pass is 12°→27°→45°→65°→81°→90°; 5) The transition sheet passes through the forming roller in the last pass to obtain a Symmetrical sheet material with U-shaped section, and due to the tension stretching between the racks, the sheet material will be straightened to ensure the shape of the longitudinal section; 6) It will have the symmetry of U-shaped s...

Embodiment approach 3

[0046] 1) Prepare a high-strength steel sheet with a length of 2000mm, a width of 200mm, and a thickness of 2mm. The front end of the sheet must have a certain slope; 2) The sheet advances in the roll at a feed speed of v=10m|min; The increase in the diameter of the rolls between times is 0.5 mm. 3) After the sheet passes through the first pass, an induction heating device is installed between the first and second passes, and the induction coil heats the sheet to a temperature of 900°C with power P, and the heating time is 18s; 4) Using 6 Roll forming is performed on the sheet material in each pass, and the bending angle of each pass is 12°→27°→45°→65°→81°→90°; 5) The transition sheet passes through the forming roller in the last pass to obtain a Symmetrical sheet material with U-shaped section, and due to the tension stretching between the racks, the sheet material will be straightened to ensure the shape of the longitudinal section; 6) It will have the symmetry of U-shaped s...

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Abstract

The invention relates to a method for producing the cold-formed steel of a U-shaped davit arm. The method comprises the following steps of: leading strong-strength sheet steel or a strong-strength steel coil into a roll for first formation, wherein the strong-strength sheet steel or the strong-strength steel coil is formed totally for 3 to 6 times; between the first formation and second formation, arranging induction heating equipment, and while forming profile steel, performing induction heating and stretching and straightening the sheet steel by utilizing roll speed differences produced by different roll diameters in the formation of each time by using the induction heating equipment; actually measuring the actual temperature of the sheet steel in the formation of each subsequent time in field according to sheet steel feeding velocity v, and controlling the temperature in an additional heating way; and performing subsequent operation such as cooling and shearing until strong-strength semicircular large-radius profile steel meeting target requirements is formed. The processes of induction heating, synchronous stretching and straightening of the roll, and the like are introduced into the conventional cold forming process, so that the low cost and high efficiency of the cold-formed steel and the characteristics of weak forming force, optimized size and the like of heat-formed sheet steel are integrated.

Description

technical field [0001] The invention relates to the research on the precision hot roll forming process of high-strength semicircle and large-radius section steel, especially the hot roll bending-stretching composite process forming method of the U-shaped boom of high-strength steel. Background technique [0002] The U-shaped boom is an important force-bearing device in the crane load-bearing system, and its load-bearing capacity directly affects the operating capacity of the entire lifting equipment. In order to improve the load-bearing capacity of the U-shaped boom, most manufacturers will choose high-strength steel as the raw material for this component, which greatly improves the load-bearing capacity of the U-shaped boom. [0003] At present, there is a bending forming method on the market to form the semi-circular large-radius section steel. However, the sheet material after bending is extremely irregular, and the size of the target product is quite different, and stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D5/14B21D5/08
Inventor 韩静涛胡兆成晏培杰王圣清吴振刚
Owner UNIV OF SCI & TECH BEIJING
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