Thermal forming and water cooling process of uniform-section boron steel pipe

A hot forming, equal-section technology, applied in forming tools, heat treatment furnaces, manufacturing tools, etc., can solve the problems of low cooling efficiency, tight mold formation, and inability to form martensite structure, and achieve uniform mechanical properties and elongation. improved effect

Active Publication Date: 2015-04-22
WUXI LANGXIAN LIGHTWEIGHT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the middle part of the workpiece, especially the front end of the head, cannot form a tight fit with the mold, so the cooling efficiency in this area is low, and the martensite structure is often unable to form, which becomes a "depression" of product strength

Method used

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  • Thermal forming and water cooling process of uniform-section boron steel pipe
  • Thermal forming and water cooling process of uniform-section boron steel pipe
  • Thermal forming and water cooling process of uniform-section boron steel pipe

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: The inflation thermoforming process of the boron steel pipe, the material of the boron steel pipe is boron steel 22MnB5, the material thickness is 2.6mm, the outer diameter of the constant section is 100mm, and the length is 850mm;

[0049] The above-mentioned workpieces are specifically processed through the following steps:

[0050] 1. Boron steel straight pipe preparation, material thickness 2.6mm, outer diameter 100mm, length 1000mm;

[0051] 2. Heating to 900°C in the heating device to completely austenitize the boron steel pipe;

[0052] 3. If Figure 1a As shown, the boron steel pipe material is placed in the mold within 6 seconds, the initial opening height of the press is 800mm, and it is closed and formed at a speed of 300mm / s;

[0053] 4. If Figure 1b As shown, the axial cylinders on both sides of the mold push the front head to seal the pipe fittings to form a closed cavity;

[0054] 5. If Figure 1c , Figure 1d , Figure 1e As shown, ...

Embodiment 2

[0058] Embodiment 2: The hot forming and water cooling process of the boron steel pipe, the material of the boron steel pipe is boron steel 22MnB5, the material thickness is 2mm, the cross-sectional outer diameter is 130mm, and the developed length is 1050mm.

[0059] The above-mentioned workpieces are specifically processed through the following steps:

[0060] 1. Boron steel straight pipe preparation, material thickness 2.0mm, pipe outer diameter 130mm, length 1200mm;

[0061] 2. Heating to 900°C in the heating device to completely austenitize the boron steel pipe;

[0062] 3. If Figure 1a As shown, the boron steel pipe material is placed in the mold within 6 seconds, the initial opening height of the press is 800mm, and it is closed and formed at a speed of 300mm / s, and the thermoforming of the part is completed;

[0063] 4. If Figure 1b As shown, the axial cylinders on both sides of the mold push the front head to seal the pipe fittings to form a closed cavity;

[00...

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Abstract

The invention relates to a thermal forming and water cooling process of a uniform-section born steel pipe. The process is characterized by comprising the steps of (1) processing the boron steel pipe into a part of which the shape and size are basically similar to the final workpiece; (2) heating the boron steel pipe part to reach the temperature of 850 to 950 DEG C through a heating device; (3) conveying the boron steel pipe part into a die of a thermal forming press; (4) closing part of the die part area or completely closing, then moving an axial shaft toward the workpiece, wherein a sealing head is arranged at the front of the axial cylinder to seal two ends of the workpiece; quickly pouring cooling water into the workpiece by the axial cylinder through a water hole in the end part of the sealing head, and circularly cooling the workpiece by the circulating mode of pouring water through one end and draining water through the other end of the sealing head, wherein the pressure of the cooling water is medium and low pressure and is preferably 0.1 to 25MPa; the cooling water is antirust soft water; the temperature is controlled to be 5 to 45 DEG C; (5) releasing pressure and opening the die. With the adoption of the process, the part of which the mechanical strength reaches 1500MPa can be produced.

Description

technical field [0001] The invention relates to a thermal forming and water cooling process of equal-section boron steel pipes, and belongs to the technical field of heat treatment plastic forming and heat treatment. Background technique [0002] As a series of hot-formed steel pipes, the production process of boron steel pipes is divided into two stages: forming and quenching and cooling. Among them: the forming stage needs to be stamped and formed by a mold at high temperature; The transformation from tensite microstructure to martensite microstructure results in extremely high strength and hardness; depending on the type of boron steel, its strength can reach 500-2000MPa. The chemical composition of common boron steels whose strength reaches 1500MPa after hot forming is shown in Table 1. [0003] Table 1 [0004] C Si mn P S Cr B min 0.20 0.20 1.00 - - 0.15 0.0015 max 0.25 0.35 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/16B21D22/02C21D9/08
CPCB21D22/022B21D22/025B21D37/16C21D9/085
Inventor 陈扬孙财李向荣
Owner WUXI LANGXIAN LIGHTWEIGHT TECH CO LTD
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