Process for producing common rail, and common rail
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A manufacturing method and common rail technology, applied in the direction of manufacturing tools, furnace types, non-electric welding equipment, etc., can solve problems such as difficult-to-machine shapes and unsuitable for industrial production, and achieve low manufacturing costs, improved fatigue strength, and improved mileage Effect
Inactive Publication Date: 2011-02-23
NIPPON STEEL CORP
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However, these methods are difficult to obtain the required processing shape with high precision and stability due to the great influence of laser irradiation, so they are not suitable for industrial production of common rail.
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Embodiment 1
[0132] Hereinafter, the results obtained by producing a common rail and conducting an internal pressure fatigue test to verify the effects of the present invention will be described.
[0133] Make it in the following way Figure 18A , Figure 18B The common rail exemplified in . First, a rail main body 51 with a length of 230 mm, a width of 40 mm, and a thickness of 30 mm, and a jig 52 with a height of 25 mm, an outer diameter of 24 mm, and a thickness of 4 mm were fabricated. The rail main body 51 and the jig 52 are manufactured by vacuum melting of 100 kg to 300 tons in a laboratory-scale vacuum melting facility or an actual steel plate manufacturing facility, or the usual blast furnace-converter-external refining-degassing / trace element Add-continuous casting-hot rolling and other processes to manufacture the steel of the chemical composition range of the present invention, then process and form Figure 18A , Figure 18B the shape shown. Next, on the track main body 51...
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Abstract
A process for producing a common rail comprising a common-rail main body and a holder therefor, the main body and the holder containing, as chemical components, 0.01-0.3 mass% carbon, 0.01-0.5 mass% silicon, 0.01-3.0 mass% manganese, 0.0003-0.01 mass% boron, 0.001-0.01 mass% nitrogen, 0.01-0.5 mass%, excluding 0.01 mass%, aluminum, and 0.01-0.05 mass% titanium, having a phosphorus content reducedto 0.03 mass% or lower, a sulfur content reduced to 0.01 mass% or lower, an oxygen content reduced to 0.01 mass% or lower, and a total content of arsenic, tin, antimony, lead, and zinc reduced to 0.015 mass% or lower, with the remainder being iron and incidental impurities, and having a TLB value of 0.001% or higher. The process comprises an insert-metal insertion step, a liquid-phase diffusion bonding step, a laser peening step, and a surface-layer removal step.
Description
technical field [0001] The invention relates to a manufacturing method of a common rail in an accumulator fuel injection system of a diesel engine and a partially strengthened common rail using the manufacturing method. [0002] This application claims priority based on Japanese Patent Application No. 2009-059918 filed in Japan on March 12, 2009, and the content thereof is incorporated herein. Background technique [0003] In mechanical parts having fluid passages, stress concentration tends to occur at the ends of tubes through which fluid flows or where diameters change extremely, and fatigue failure as a result of fluid pressure fluctuations may become a problem. [0004] The common rail is a conduit-shaped component used to store light oil between the pump and the injector that pressure-feed light oil in the pressure-accumulation fuel injection system of a diesel engine. figure 1 The outline of the cross section of the common rail 1 is shown. The track hole 5 is the ma...
Claims
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