Method for controlling strength distribution during high-strength steel pipe hot forming

A strength distribution and hot forming technology, applied in the field of controlling the strength distribution of high-strength steel pipe fittings during hot forming, can solve problems such as difficulty in forming parts, sudden changes in material thickness at welds, and insufficient strength distribution of parts to achieve low cost. , to avoid performance mutation, the effect of simple mold structure

Inactive Publication Date: 2013-04-17
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that boron steel blanks of different types and thicknesses are welded together and then deformed to obtain pipes with reasonable strength distribution. The thickness of the material at the welding place is prone to sudden changes, resulting in difficulty in forming the parts or the strength of the formed parts. The problem that the distribution cannot meet the requirements, and a method for controlling the distribution of strength during hot forming of high-strength steel pipes is provided

Method used

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  • Method for controlling strength distribution during high-strength steel pipe hot forming
  • Method for controlling strength distribution during high-strength steel pipe hot forming
  • Method for controlling strength distribution during high-strength steel pipe hot forming

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specific Embodiment approach 1

[0014] Specific implementation mode one: combine Figure 1 ~ Figure 3 Specifically illustrate the implementation steps of this embodiment:

[0015] Step 1. Put the high-strength steel pipe billet 1 to be formed into the heater 2, divide the high-strength steel pipe billet 1 into several areas along the length direction, and the several areas are respectively the first area A, the second area B and the third area C, and the heater Zone 1 A, Zone 2 B and Zone 3 C corresponding to 2 adopt different or the same heating temperature for partition control, and Zone 1 A, Zone 2 B and Zone 3 C corresponding to heater 2 adopt different or the same heating time for partition control control;

[0016] Step 2, quickly transfer the heated high-strength steel pipe blank 1 to the forming mold 3 within 3 to 5 seconds, quickly close the forming mold 3 and complete the forming of the high-strength steel pipe blank 1 within 1 to 3 seconds;

[0017] Step 3, keeping the forming mold 3 closed, pa...

specific Embodiment approach 2

[0020] Specific implementation mode two: combination figure 1 To illustrate this embodiment, the first zone A, the second zone B and the third zone C corresponding to the heater 2 in the step 1 of this embodiment adopt different heating temperatures and the same heating time to carry out zone control, and use thermocouples 5 to measure high-strength The temperature of the first area A, the second area B and the third area C on the steel pipe billet 1, the area with high strength requirement is heated to 850 ℃ ~ 1000 ℃, the area with low strength requirement is heated to 700 ℃ ~ 850 ℃, and the area with high strength requirement is heated The heating time for areas with low strength requirements is 3 minutes to 6 minutes. In this embodiment, different austenitization degrees are obtained by controlling the heating temperature of different regions on the high-strength steel pipe blank 1 . During implementation, the above-mentioned purpose can be achieved only by performing zone...

specific Embodiment approach 3

[0021] Specific implementation mode three: combination figure 1 To illustrate this embodiment, the heating temperature of the high-strength steel pipe billet 1 in step 1 of this embodiment is 900°C for the area with high strength requirements, 750°C for the area with low strength requirements, and the area with high strength requirements and the area with low strength requirements The heating time is 5min. In this embodiment, different austenitization degrees are obtained by controlling the heating temperature of different regions on the high-strength steel pipe blank 1 . During implementation, the above-mentioned purpose can be achieved only by performing zone temperature control on the heater 2, and the method is simple and feasible. Other steps are the same as in the second embodiment.

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Abstract

The invention relates to a high-strength steel pipe hot forming method, in particular to a method for controlling the strength distribution during high-strength steel pipe hot forming and solves problems that boron steel blanks of various types and thicknesses deform after welding, materials in welding positions change abruptly easily, and accordingly, the strength distribution of formed components cannot reach requirements. The method comprises the steps as follows: step one, placing a high-strength steel pipe blank to be formed into a heater, and performing zone control on a first zone, a second zone and a third zone corresponding to the heater by adopting same or different heating temperatures and different or same heating times; step two, transferring the heated high-strength steel pipe blank to a forming die in three seconds to five seconds, closing the forming die rapidly, and forming the high-strength steel pipe blank in one second or three seconds; step three, keeping the forming die to be closed, feeding cold water into a cooling hole in the forming die to reduce the temperature of the forming die, and quenching; and step four, after quenching, opening the forming die, and taking out the obtained high-strength steel pipe component. The method is applicable to high-strength steel pipe hot forming.

Description

technical field [0001] The invention relates to a thermoforming method for high-strength steel pipe fittings, in particular to a method for controlling the intensity distribution of high-strength steel pipe fittings during thermoforming. Background technique [0002] In industries such as aerospace and automobile manufacturing, the lightweight of structures has become one of the most important goals. The main way to realize the lightweight structure is to optimize the design of the structure and use complex and integral components to replace the components that have been formed separately and assembled and welded in the past; the second is to use lightweight materials with high specific strength such as aluminum alloys and magnesium alloys. Provides greater strength with the same mass of material. [0003] In the automobile manufacturing industry, with the increasingly urgent requirement for weight reduction, a number of high-strength steels have been developed, such as dua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 王志彪何祝斌苑世剑
Owner HARBIN INST OF TECH
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