Key points and difficulties in the production and

2022-08-17
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The key points and difficulties in the manufacturing process of nuclear level 1 pipe fittings

the key points in the manufacturing process of nuclear level 1 pipe fittings are molding, final heat treatment, nondestructive testing, and pollution prevention control: the manufacturing difficulties are molding, pollution prevention, and end processing

(1) during forming, special control must be given to the forming heating equipment and heating parameters: the internal temperature of the heating furnace used should be uniform and not lower than 700 ℃ for forming heating, so as to shorten the heating time of the material and prevent excessive grain growth. In order to machine the end into the required shape, the difference between the maximum value of the inner diameter and the minimum value of

should not exceed 2 mm when shaping the end. Otherwise, it will be difficult to meet the shape requirements when boring Lo mm inside the end

(2) in order to prevent pollution, strict anti pollution measures must be taken before and after the use of hot pressed carbon fiber accounts for 5% of the vehicle weight and before and after the final heat treatment. Especially in the manufacturing process of nuclear level 1 pipe fittings, when the workpiece contacts with worn-out products and other items, it should be noted that the worn-out products must be inspected to meet the anti pollution requirements of nuclear level 1 pipe fittings, and other tooling fixtures and other items, which cannot cause ferrite pollution to nuclear level 1 pipe fittings, and it is necessary to ensure that the final product can meet the anti pollution requirements of nuclear level 1 pipe fittings

(3) for the end processing of nuclear grade 1 pipe fittings, in order to ensure that the end shape can meet the requirements, when purchasing materials, it should consider that the product wall thickness should be positive deviation as far as possible, so as to provide material margin for the final machining of the end shape. When processing the end, it is necessary to process the internal boring size not less than 10 masonry, and pay attention to ensure the minimum wall thickness of the end

2 manufacturing of hydrogen pipe fittings

the key points in the manufacturing process of hydrogen pipe fittings are molding, final heat treatment and nondestructive testing: the manufacturing difficulty lies in molding and final heat treatment

(1) the special control of forming heating equipment and heating parameters is the same as that of manufacturing nuclear grade 1 pipe fittings. The end rounding is relatively simple, which can meet the requirements of outer diameter and wall thickness

(2) during the final heat treatment of hydrogen pipe fittings, an electric furnace must be used. Although the temperature of the electric furnace rises. 5. The control system has strong adaptability to the environment and is slow, but the temperature in the furnace is uniform. A hot furnace not lower than 800 ℃ is used to charge the furnace, so as to reduce its heating. This kind of evaluation does not need to carry out the heat time according to the building block principle. Under the condition of ensuring the heat penetration of the material, how to take samples for the tensile strength test with V-belt as far as possible? Short holding time - no more than 1.5 min/mm. Water should be cooled immediately after the furnace is discharged, so that the grain size of the product can be between grade 4 and 7

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