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- Aluminum Alloy Sheets Suppliers
- The aluminum alloy sheets suppliers in China are well known on the world market for good quality, great service and cheap price. After buy aluminum alloy sheet from China suppliers, you may find the surface of aluminum sheet product is clean. That’s because aluminum alloy sheets supplier in China have take measures to clean it.
Cleaning:
1, Before heat treatment, aluminum alloy sheet workpieces and fixtures should be cleaned of foreign objects such as oil, residual salt, paint, etc.
2, The fixture used for the first time in the vacuum furnace should be degassed and purified in advance under the vacuum degree not lower than that required by the workpiece.
Loading the furnace:
1, The aluminum alloy sheet is easy to deform the workpiece during the heat treatment process and should be heated on a special fixture
2, The workpiece should be placed in the effective heating zone
Preheat:
1, For workpieces with complex shapes or sharp changes in cross-section and large effective thickness, preheating should be performed.
2, The methods of preheating are: 800°C for the first preheating, 500~550°C and 850°C for the second preheating, and the temperature rise rate for the first preheating should be limited
Heating:
1, Workpieces with grooves and non-through holes, castings and welded parts, as well as processed aluminum plate workpieces, are generally not suitable for heating in a salt bath furnace.
2, The workpiece heating should have sufficient holding time, which can be calculated according to the effective thickness of the workpiece and the conditional thickness
Cool down:
1, When the aluminum alloy sheet is air-cooled, it should be scattered in a dry place
2, Aluminium alloy sheet can be cleaned, cryogenically treated or tempered after quenching and cooling to room temperature
3, The aluminum sheet should be tempered in time after quenching, and the time interval should not exceed 4h.
4, For welded assemblies consisting of aluminum sheets, the time interval between welding and subsequent heat treatment shall not exceed 4 hours
Clean up:
1, According to the requirements of the workpiece and the surface condition, it is cleaned by alkaline cleaning, water-soluble cleaning agent, chlorine solvent sand blasting, shot blasting, etc.
2, Generally, pickling is not used for cleaning
Correction:
1, The workpiece is corrected by static load, and it is generally not suitable for local knocking
2, After correction, stress relief annealing should be carried out at a temperature lower than the original tempering temperature
3, For workpieces with complex shapes or strict size requirements, after correction, use a setting fixture combined with tempering to correct them.
4, For aluminum sheet workpieces, stress relief treatment is performed below 300°C after calibration
Quality inspection of aluminum alloy sheets suppliers:
1, The workpiece is inspected according to the items and requirements specified in the corresponding technical documents
2, When the mechanical properties of the workpiece are unqualified, the heat treatment can be repeated, but the number of repeated quenching or solid solution generally does not exceed twice. Supplementary tempering of workpieces does not count as reprocessing
3, Aluminium alloy sheet workpieces in the quenched state or after low temperature tempering should be preheated, annealed or tempered at high temperature before repeated quenching
4, The original records of heat treatment shall be properly kept for future reference.
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