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Method for increasing the strength of components made of steel under cyclic load

A cyclic load, steel component technology, which is applied to the pressure bearing components of fuel injection systems and the pressure bearing capacity of high mechanical load components, can solve problems such as the adverse effects of cyclic pressure bearing capacity, and achieve improved tolerance and residual stress. The effect of stabilizing and improving the cyclic pressure capacity

Inactive Publication Date: 2012-09-12
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tests recorded in the literature have shown that the vibration resistance can also be increased by nitriding, but this outstanding feature is a connection with a thickness of at least 0.04 mm, which is required for improved wear resistance and has a certain corrosion resistance layer will adversely affect the cyclic pressure capacity

Method used

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  • Method for increasing the strength of components made of steel under cyclic load
  • Method for increasing the strength of components made of steel under cyclic load
  • Method for increasing the strength of components made of steel under cyclic load

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Embodiment Construction

[0041] exist figure 1 The component 1 shown schematically in , is made of steel, in particular pressure-bearing and / or mechanically highly loaded components of a fuel injection system. In order to increase the pressure-bearing capacity of the component 1 under cyclic loading conditions, a residual compressive stress distribution is selectively introduced into the component surface, which counteracts the load distribution acting on the component surface under cyclic loading conditions. By gas nitriding the component at a nitriding temperature between approximately 420° C. and approximately 620° C. for a duration of nitriding depending on the desired target strength, the residual pressure is selectively reduced by means of gas nitriding of the component 1 Stresses are introduced into the surface of the component. The nitriding duration can be up to 96 hours, preferably between 2 and 12 hours.

[0042] Gas nitriding not only introduces a nitride diffusion layer 2 into the compo...

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Abstract

The invention relates to a method for increasing the strength of components (1) made of steel, in particular pressurized components of fuel injection systems and / or components of fuel injection systems subjected to high mechanical loads, under cyclic load using residual compressive stresses that are deliberately introduced into the component surface and that counteract the load distribution acting on the component surface during cyclic loads, wherein, according to the invention, a residual compressive stress profile is introduced into the component surface by means of gas nitriding of the component (1) and a nitride bonding layer (3) having a thickness (d) of no more than 10 [mu]m is applied to the component surface during gas nitriding.

Description

technical field [0001] The invention relates to a method of the type specified in claim 1 for increasing the pressure-bearing capacity of steel components under cyclic loading conditions, in particular pressure-bearing and / or highly mechanically loaded components of fuel injection systems. Background technique [0002] Pressure-bearing and / or mechanically highly loaded components of fuel injection systems are subjected to stresses ranging from purely pulsating tensile stresses to cyclical alternating tension-compression stresses. [0003] The cyclic pressure bearing capacity of the member is especially related to the structure and strength of the selected steel. Either by changing the chemical composition or by heat treatment, the structure of the steel can be influenced to meet the above stress requirements. However, these measures lead to disadvantageously high material and production costs due to the high alloying element content and the sometimes very complicated heat t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26
CPCC23C8/26
Inventor A·贝希特T·奥滕H·朗纳R·屈布勒K-O·恩勒特
Owner ROBERT BOSCH GMBH
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