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Method for manufacturing steel fuel-pressure-feeding pipe

A manufacturing method and piping technology, applied to fuel injection devices, fuel injection devices with anti-corrosion measures, pipes, etc., can solve problems such as corrosion and inability to obtain resistance to corrosive fuels, and achieve improved corrosion resistance and straight-through performance Good, smoothness-enhancing effect

Pending Publication Date: 2019-09-10
USUI KOKUSAI SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] That is, when the above-mentioned fuel pressure feeding pipe made of steel is used, for example, when a drawn pipe is used, there are initial flaws (fine cracks, wrinkle flaws, etc.) Below, there are initial flaws (defective welds, etc.)
When the above-mentioned inner surface treatment (for example, Ni plating, etc.) is carried out in the state where there are defects on the inner peripheral surface of such a pipe, in particular, there are microscopic cracks or wrinkle defects, or welding defects, the plating solution does not penetrate into the microscopic Cracks or wrinkle flaws, the inside of weld defects, micro cracks, wrinkle flaws, and parts of weld defects that are not completely surface-treated and become defects, especially corrosion and rust cannot be obtained because resistance to corrosive fuels cannot be obtained. The problem

Method used

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  • Method for manufacturing steel fuel-pressure-feeding pipe
  • Method for manufacturing steel fuel-pressure-feeding pipe
  • Method for manufacturing steel fuel-pressure-feeding pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0025] In the pipe manufacturing process 1, steel drawn pipes (sample Nos. For the pipe material, after flaw detection of the inner peripheral surface of the drawn pipe material with a flaw detector in the flaw detection process 2 to detect initial defects (fine cracks or wrinkle defects, welding defects, etc.), in the sorting process 3 of the drawn pipe material , sort out the stretched pipes whose detection value exceeds the preset threshold (150 μm) and the stretched pipes that do not exceed the threshold detected in the above-mentioned flaw detection step 2, and in the next initial flaw removal step 4, The inner peripheral surface of each drawn pipe material not exceeding the above-mentioned threshold value was cut by the gun barrel drilling machine 7 for deep hole processing. The cutting amount of the inner peripheral surface at this time was 0.2 mm (sheet thickness). Next, in the surface treatment step 5, electroless Ni plating is performed on the pipe inner peripheral ...

Embodiment 7～12

[0037] In the pipe manufacturing process 1, welded steel pipes (sample Nos. 7 to 12) manufactured by a welded pipe manufacturing device with an outer diameter of 15.9 mm and an inner diameter of 9.9 mm were used as piping base materials, and depth investigation of welding defects The depth that should be removed by the statistical method in advance, the cutting amount of the inner surface of the tube is set according to the expected maximum damage depth, and the cutting amount of the preset cutting amount threshold (150μm) is used to use the gun for deep hole processing The pipe drilling machine 7 cuts the inner peripheral surface. The cutting amount of the inner peripheral surface at this time was 0.2 mm (sheet thickness). Next, in the surface treatment step 5, electroless Ni plating was performed on the pipe inner peripheral surface of each welded pipe having the cut inner peripheral surface, to form a Ni—P (electroless Ni) plating layer with a film thickness of 3 to 5 μm. ...

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Abstract

Provided is a method for manufacturing a high-quality steel fuel-pressure-feeding pipe having high resistance to corrosive fuel. This method is characterized in that steel pipe material is sorted intopipe material in which initial flaws (tiny cracks, wrinkle flaws, weld defects, etc.) in the inner peripheral surface of the pipe material exceeds a preset threshold value and pipe material in whichthe threshold value is not exceeded, and after initial flaws in the inner peripheral surfaces of the pipe material not exceeding the threshold value are removed by mechanical cutting, a surface treatment of Ni plating or the like is performed on the inner peripheral surfaces of this pipe material.

Description

technical field [0001] The present invention relates to a method of manufacturing a pipe for supplying fuel to an engine in a gasoline direct injection engine system or a diesel engine system, and involves, for example, performing an inner surface treatment by removing fine cracks or wrinkle defects generated on the inner surface by drawing the pipe, etc., A method of manufacturing high-quality steel fuel pressure pipes excellent in corrosion resistance. Background technique [0002] Among the above-mentioned fuel pressure feeding piping used in the gasoline direct injection engine system or the diesel engine system, as specifications having various performances such as pressure resistance, airtightness, and corrosion resistance, stainless steel-based materials are most used. Fuel pressure pipes that are finished by performing various plastic processing (pipe end forming processing, bending processing, etc.) or joining processing (brazing processing, etc.). [0003] In addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M55/02B23P6/04
CPCB23P6/04F02M55/02F02M2200/05F02M61/168C23C18/1616C23C18/32B21C1/22B23P15/16F02B3/06F16L9/02
Inventor 池谷刚人
Owner USUI KOKUSAI SANGYO KAISHA LTD