EPS input shaft

A technology of input shaft and added amount is applied in the field of alloy steel materials, which can solve the problems affecting the quality of automobiles and the hazards of automobile safety performance, and achieve the effects of reducing porosity, enhancing high temperature resistance and strong fracture resistance.

Inactive Publication Date: 2018-04-20
NINGBO HONGBO MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The safety performance of the car with such a fracture ratio has caused great harm and seriously affected the overall quality of the car.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Press molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with TiC particles, paraffin, and zinc stearate; wherein, alloy steel specifically includes the following components by mass percentage: C: 1.3%, Cr: 16.2%, Mo: 14.2%, Nb: 0.5%, N: 0.12%, Si: 0.26%, Mn: 0.34%, V: 1.2%, rare earth elements: 0.67%, the balance is Fe, and the rare earth elements are composed of La and Ce according to the mass ratio 1.2:1 composition; the addition of TiC particle is 0.4% of alloy steel raw material quality, and diameter is 2-mm, and the addition of described paraffin is 0.8% of alloy steel raw material quality, and the addition of described zinc stearate is 0.65% of the quality of alloy steel raw materials; the pressure of pressing is 620MPa;

[0036] Pre-firing and cooling: pre-fired at 1000°C for 30 minutes in a hydrogen atmosphere, and water-cooled to obtain a pre-fired billet;

[0037] Recompression: Recompress the calcined billet at 710MPa;...

Embodiment 2

[0043] Compression molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with TiC particles, paraffin, and zinc stearate; wherein, alloy steel specifically includes the following components in mass percentages: C: 1.45%, Cr: 16.3%, Mo: 14.4%, Nb: 0.6%, N: 0.15%, Si: 0.28%, Mn: 0.35%, V: 1.3%, rare earth elements: 0.71%, the balance is Fe, and the rare earth elements are composed of La and Ce according to the mass ratio 1.3:1 composition; the addition of TiC particle is 0.41% of alloy steel raw material quality, and diameter is 2.2mm, and the addition of described paraffin is 0.81% of alloy steel raw material quality, and the addition of described zinc stearate is alloy steel 0.66% of the mass of steel raw material; the pressing pressure is 628MPa;

[0044] Pre-fired cooling: Pre-fired for 31 minutes under a hydrogen atmosphere at 1015°C, and water-cooled to obtain a pre-fired billet;

[0045] Recompression: Recompress the calcined billet at...

Embodiment 3

[0051] Compression molding: Weigh alloy steel raw materials, ball mill them into powder, and then press them with TiC particles, paraffin, and zinc stearate; wherein, alloy steel specifically includes the following components in mass percentages: C: 1.75%, Cr: 16.5%, Mo: 14.55%, Nb: 0.65%, N: 0.18%, Si: 0.29%, Mn: 0.37%, V: 1.4%, rare earth elements: 0.74%, the balance is Fe, and the rare earth elements are composed of La and Ce according to the mass ratio 1.35:1 composition; the addition of TiC particle is 0.42% of alloy steel raw material quality, and diameter is 2.5mm, and the addition of described paraffin is 0.83% of alloy steel raw material quality, and the addition of described zinc stearate is alloy steel 0.68% of the mass of steel raw material; the pressing pressure is 637MPa;

[0052] Pre-firing and cooling: pre-fired at 1025°C for 33 minutes in a hydrogen atmosphere, and water-cooled to obtain a pre-fired billet;

[0053] Recompression: Recompress the calcined bill...

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Abstract

The invention belongs to the field of alloy steel materials and relates to an input shaft, in particular to an EPS input shaft. The EPS input shaft is made of alloy steel. The alloy steel specificallycomprises the following components of, by mass, 1.3-2.2% of C, 16.2-16.8% of Cr, 14.2-14.9% of Mo, 0.5-0.8% of Nb, 0.12-0.25% of N, 0.26-0.32% of Si, 0.34-0.39% of Mn, 1.2-1.6% of V, 0.67-0.82% of rare earth and the balance Fe. The surface of the alloy steel is sequentially coated with an aluminum layer, a mussel byssus albumen layer and a nanometer ZrC layer. According to the EPS input shaft, Vand Nb are added into the alloy steel, the abrasion resistance of the alloy steel can be improved, and the material hardness, tensile strength, yield strength and after-breaking elongation are improved.

Description

field of invention [0001] The invention relates to an input shaft, in particular to an EPS input shaft, and belongs to the field of alloy steel materials. Background technique [0002] With the rapid development of the domestic automobile industry, the requirement to improve the overall quality of automobiles has increasingly become the mainstream of the passenger car market. In this way, the steering system of passenger cars has also transitioned from the original hydraulic power assist to electric power assist, and the requirements for the fracture resistance of the input shaft, the main part of the electric power steering system (EPS), of automobiles are also getting higher and higher. At the same time, the research on its torsional strength performance It also unfolded accordingly. [0003] The main part of the current automobile steering system, the EPS input shaft, is used after ordinary heat treatment (No. 45 steel material), and the material of the steering steering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/26C22C38/02C22C38/04C22C38/24B22F3/16B22F3/24C21D1/18C21D9/28C23C28/00
CPCC22C38/22B22F3/16B22F3/24B22F2003/242B22F2003/248B22F2998/10B22F2999/00C21D1/18C21D9/28C22C38/001C22C38/005C22C38/02C22C38/04C22C38/24C22C38/26C23C28/322C23C28/341B22F3/02B22F3/1007B22F3/14B22F2201/013
Inventor 施红飞王巧洪若冰夏吉显侯卫兵
Owner NINGBO HONGBO MACHINERY MFG
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