9
2025.9
author
88
Reading volume
1.Casting requirements
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Cold barriers, cracks, shrinkage and penetrating defects and serious defects (such as undercasting, mechanical damage, etc.) are not allowed on the surface of the casting.
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The casting should be cleaned, without burrs and flash, and the pouring riser on the non-processing sign should be cleaned flush with the surface of the casting
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The casting words and logos on the raw surface of the casting should be clearly distinguishable, and the position and font should meet the requirements of the drawing
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The roughness of the unmachined surface of the casting, sand casting R, not more than 50μm
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The casting should be cleared of sprouting risers, flying burrs, etc. The residual amount of the pouring riser on the non-processed surface should be shoveled and polished to meet the surface quality requirements
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The molding sand, core sand and core bone on the casting should be removed
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The casting has an inclined part and its dimensional tolerance belt should be arranged symmetrically along the inclination
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The molding sand, core sand, core bone, succulent, sticky sand, etc. on the casting should be shoveled and smoothed and cleaned
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The wrong type, boss casting, etc. should be corrected to achieve a smooth transition and ensure the appearance quality
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The depth of the wrinkles on the unmachined surface of the casting should be less than 2mm and the spacing should be greater than 100mm
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The non-machined surfaces of machine product castings need to be shot peening or roller treated to meet the requirements of cleanliness Sa2 1/2 level
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Casting must be carried outWater toughness treatment
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The surface of the casting should be flat, and the gates, burrs, sticky sand, etc. should be removed
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Casting parts are not allowed to have casting defects such as cold partitions, cracks, holes, etc. that are detrimental to use
2.Paint requirements
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All steel surfaces that need to be painted must be removed from rust, scale, grease, dust, dirt, salt and dirt before painting
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Before rust removal, use organic solvents, lye, emulsifiers, steam, etc. to remove grease and dirt on the surface of steel parts
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The time interval between the surface to be painted and the primer applied by shot peening or manual rust should not be more than 6h
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The surfaces where the riveted parts touch each other must be coated with anti-rust paint with a thickness of 30~40μm before connection. The lap edges should be closed with paint, putty or adhesive. Repaint due to processing or welding damaged primer
3. Plumbingrequest
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The unnoted shape tolerance should meet the requirements of GB1184-80
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All tubes should be removed from flash, burrs and chamfers before assembly. Use compressed air or other methods to clear the debris and floating rust attached to the inner wall of the pipe
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Before assembly, all steel pipes (including prefabricated pipelines) must be degreased, pickled, neutralized, washed and anti-rust
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During assembly, the parts fixed by threaded connections, such as pipe clamps, bearings, flanges and joints, should be tightened to prevent loosening
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The welded parts of the prefabricated pipes must be subjected to pressure resistance tests
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When the pipe is replaced or transferred, the pipeline separation port must be sealed with adhesive tape or plastic pipe to prevent any debris from entering, and the label must be tied
4.Welding requirements
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The unnoted shape tolerance should meet the requirements of GB1184-80
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Before welding, the defects must be completely removed, and the bevel surface should be smooth and smooth, and there should be no sharp corners
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According to the defects of the casting parts, shoveling, grinding, and carbon arcing can be used for the defects in the welding areaGouging, gas cutting or mechanical processing and other methods to remove it
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Dirt such as sticky sand, oil, water, and rust within 20mm around the welding area and bevel must be thoroughly cleaned
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During the whole process of welding, the temperature of the preheating area of the casting shall not be lower than 350°C
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Weld in a horizontal position whenever possible
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When repairing welding, the welding rod should not swing too much
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When the surface of the steel casting is stacked and welded, the overlap between the weld beads shall not be less than 1/3 of the width of the weld bead. The weld meat is full, and the weld surface is free of burns, cracks and obvious nodules. The weld has a beautiful appearance, no defects such as biting, slag, porosity, cracks, and splashing; The soldering wave is uniform
5.Forging requirements
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Each seal must be soaked with oil before assembly
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The water port and riser of the ingot should have sufficient cutting volume to ensure that the forging has no shrinkage holes and serious deflection
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The forging should be forged into shape on a forging press with sufficient capacity to ensure that the inside of the forging is fully forged
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Forgings are not allowed to have cracks, folds, and other cosmetic defects that affect use. Local defects can be removed, but the cleaning depth should not exceed 75% of the machining allowance, and the defects on the unmachined surface of the forging should be cleaned up and smoothly transitioned
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The forging does not allow white spots, internal cracks, and residual shrinkage holes
6.Requirements for cutting workpieces
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Parts should be inspected and accepted according to the process, and can be transferred to the next process after passing the inspection of the previous process
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The machined part is not allowed to have burrs
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The finished parts should not be placed directly on the ground, and necessary support and protection measures should be taken. The processed surface is not allowed to have rust and bumps, scratches and other defects that affect performance, life or appearance
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The surface of the rolling finishing should not peel off after rolling
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The surface of the parts after heat treatment in the final process should not have oxide scale. The finished mating surface and tooth surface should not be annealed
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The machined thread surface is not allowed to have defects such as black skin, bumps, random buckles and burrs
