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Non-quenched and tempered hinge pin shaft and manufacturing method thereof

A manufacturing method and technology of hinge pins, applied in the field of hinge pins, can solve the problems of high energy consumption per unit of product, less research and application of non-quenched and tempered steel, and achieve the effects of improving performance and reducing production costs

Active Publication Date: 2016-07-13
GUANGXI LIUGONG MASCH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic construction machinery industry still mainly uses the traditional quenched and tempered steel 40Cr as the main raw material, and the research and application of non-quenched and tempered steel is less, and the unit energy consumption of the product is high

Method used

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  • Non-quenched and tempered hinge pin shaft and manufacturing method thereof
  • Non-quenched and tempered hinge pin shaft and manufacturing method thereof
  • Non-quenched and tempered hinge pin shaft and manufacturing method thereof

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preparation example Construction

[0047] The preparation method adopted for the non-quenched and tempered hinged pin shaft is: electric arc furnace smelting + refining / vacuum degassing → continuous casting → secondary rolling to form a yield strength of not less than 480MPa, a tensile strength of not less than 720MPa, and an elongation after fracture. The non-quenched and tempered steel required for the above-mentioned hinge pins with a length of not less than 17%, a reduction of area of ​​not less than 45%, an impact absorption energy of not less than 40J, and a hardness of 240HBW to 275HBW; The quenched and tempered steel is obtained by blanking to obtain the required specifications without quenching and tempering treatment, and the surface is directly quenched after rough machining to form the semi-finished product of the hinge pin.

[0048] In the present invention, the surface induction hardening process parameters of the non-quenched and tempered steel hinge pin with the above chemical composition are: vo...

Embodiment 1

[0052] A hinge pin used for construction machinery, the non-quenched and tempered steel includes the following chemical components by weight percentage: 0.41%C, 0.42%Si, 1.31%Mn, 0.013%P, 0.003%S, 0.16%Cr, 0.015% Mo, 0.022% Ni, 0.032% Cu, 0.11% V.

[0053] The mechanical properties of hot-rolled non-quenched and tempered steel were tested using GB / T228-2002 "Metallic Materials Tensile Test Method at Room Temperature", and the results are shown in Table 2.

[0054] Table 2 Test results of hot-rolled mechanical properties of non-quenched and tempered steel hinge pins for construction machinery

[0055]

[0056] The hot-rolled microstructure of the non-quenched and tempered steel hinge pin is pearlite+ferrite, and the photo of the metallographic structure is as follows: image 3 shown.

[0057] After surface quenching, metallographic examination was carried out, and the results are shown in Table 3.

[0058] Table 3 Test results of hinged pin shafts for construction machine...

Embodiment 2

[0061] A hinge pin used for engineering machinery, the non-quenched and tempered steel includes the following chemical components by weight percentage: 0.36%C, 0.38%Si, 1.20%Mn, 0.012%P, 0.003%S, 0.16%Cr, 0.015% Mo, 0.018% Ni, 0.027% Cu, 0.10% V.

[0062] The mechanical properties of hot-rolled non-quenched and tempered steel were tested using GB / T228-2002 "Metallic Materials Tensile Test Method at Room Temperature", and the results are shown in Table 4.

[0063] Table 4 Test results of hot-rolled mechanical properties of non-quenched and tempered steel hinge pins for construction machinery

[0064]

[0065] The hot-rolled microstructure of the non-quenched and tempered steel hinge pin is pearlite+ferrite, and the photo of the metallographic structure is as follows: Figure 4 shown.

[0066] After surface quenching, metallographic examination was carried out, and the results are shown in Table 5.

[0067] Table 5 Test results of hinged pin shafts for construction machine...

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Abstract

The invention provides a non-tempering hinge joint pin shaft and a manufacturing method thereof. The hinge joint pin shaft is manufactured by taking non-tempering steel as a raw material; the non-tempering steel comprises the following chemical components in percentage by weight: 0.35%-0.45% of C, 0.25%-0.50% of Si, 1.00%-1.50% of Mn, 0.0001%-0.020% of P, 0.0001%-0.015% of S, 0.005%-0.25% of Cr, 0.005%-0.15% of Mo, 0.005%-0.25% of Ni, 0.001%-0.20% of Cu, 0.05%-0.15% of V and the balance amount of Fe and inevitable impurities. The non-tempering hinge joint pin shaft has the advantages that the hinge joint pin shaft which is made of traditional tempering steel 40Cr and is mainly used by the current industry is replaced so that the energy-saving and cost-reducing effects are achieved, the performance is improved, the production cost is reduced and the considerable economic benefits are obtained.

Description

technical field [0001] The present invention relates to a hinge pin used for engineering machinery, in particular to a non-tempered hinge pin and a manufacturing method thereof. Background technique [0002] The traditional quenching and tempering treatment has long production cycle, high energy consumption, high production cost, and harsh working environment. The production process produces "three wastes" that pollute the environment. With the shortage and depletion of global resources and energy, energy conservation and emission reduction, and the development of low-carbon economy have become the consensus of the world, and it is also the direction for China to adjust its economic structure and development model in the future. Therefore, the research and application of non-quenched and tempered steel, energy saving and consumption reduction, in line with the requirements of developing a low-carbon economy, is the development trend of green manufacturing and the needs of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C21D1/10
CPCY02P10/25
Inventor 蒙秋红邓颖章安申涛
Owner GUANGXI LIUGONG MASCH CO LTD