How to control the quality of aluminum alloy doors and windows in the production process?

The quality of aluminum doors and windows products directly affects the quality of housing construction projects, and also affects the reputation and economic benefits of aluminum doors and windows production, construction and installation enterprises.
1. aluminum doors and windows production process quality control
1. Quality control of raw and auxiliary materials The suppliers of raw and auxiliary materials for the production of aluminum doors and windows have all obtained ISO international quality certification and have a complete quality system, but the current actual situation in China shows that there are still unqualified products supplied to customers. Therefore, in the production of aluminum doors and windows, the purchased raw materials must be strictly inspected and controlled before entering the warehouse.
(1) Main quality control contents of aluminum alloy profiles
① With product quality guarantee;
The wall thickness of aluminum profiles, oxide film or coating composite film thickness, hardness, etc. should meet the national standard GB/T5237.1-2000, or meet the design and production of aluminum doors and windows product requirements;
③ Aluminum profile appearance surface quality, color should be consistent with the sample.
(2) Main quality control of hardware accessories and auxiliary materials
① Quality control of stainless steel sliding support and inspection of product certificate; Test the quality of materials and test the magnetism of stainless steel with magnets; Use vernier calipers to measure the key triangular positioning dimensions and hole spacing dimensions that affect the installation quality, as well as the thickness and width of materials, etc. The rest shall be inspected and controlled according to the GB9300-88.
② Compare the linkage handle with the sample provided in advance, check the certificate and warranty, and inspect the rest according to the GB9298-88 standards.
③ aluminum alloy door and window lock and ball lock quality control sampling inspection appearance and structure quality, should be consistent with the model, opening and closing to be flexible, other according to GB9302/9303-88 and GB8388-87 standard inspection control.
④ The quality of floor springs, door and window pulleys and self-tapping screws shall be consistent with the sample, and the certificate of approval, warranty and the rest shall conform to GB9296-88,GB9304-88 and GB845/846-85 standards respectively.
⑤ The quality control of core-pulling nails and silicone building sealants The quality control of these two materials must be tested in kind. The common quality problem of core-pulling nails is that the outer cladding material is soft and cannot achieve the expected fastening effect, especially the unqualified part is usually hidden, which is easy to cause serious quality accidents. Therefore, the quality of this material should be strictly controlled and regular inspection and supervision should be carried out. For the quality control of sealant, whether it is glass glue or exterior wall glue, the purpose of physical test is to observe its fluidity, prevent too thin, adhesion adsorption, surface dry and overall curing speed. Usually poor quality sealant performance, too thin, mobility, poor adsorption performance and the overall curing time is long, often lead to poor quality aluminum doors and windows products.
⑥ Quality control of accessories such as sealing rubber strips and horizontal and vertical wool strips The quality control of these accessories is mainly to compare with the samples provided in advance or to carry out physical tests to check whether their quality meets the design requirements of aluminum doors and windows.
2. Cutting and machining process quality control
(1) The quality control of aluminum profile sawing is mainly to strictly control the accuracy of length size and angle. The length of the door and window frame material is usually controlled as a positive value <0.5~0.0mm: the length of the door and window sash material is usually controlled as a negative value -0.5~0.0mm. For angled cutting materials in door and window frames and fan materials, the angle of the opened aluminum profile end must be accurate, and the physical docking test must be carried out to meet the design requirements.
(2) The quality control of the machining processes of gongs and tenons, milling, drilling, punching and shearing of aluminum door and window materials is mainly based on the dimensions and relevant quality requirements determined by the design drawings and process technology cards of aluminum doors and windows. In order to reduce errors and unnecessary losses, it is necessary to accurately debug the knives, molds, drills, etc. of relevant mechanical equipment before work. Only after the size debugging is confirmed to be correct can it be put into mass production. At the same time, pay attention to eliminate a small amount of unqualified aluminum profiles to prevent them from flowing into the next process. In addition, during operation, the size of the processed objects should be detected at certain intervals to prevent deviation caused by mechanical failure. In addition, the surface of the machining operation platform and the clamp should be controlled to be clean, and the damage and marking of aluminum profile veneer caused by aluminum scrap foreign matter should be removed. If necessary, wrap the aluminum finish with protective tape before opening to ensure product quality.
3. Assembling packaging
(1) Quality control of the assembly process Assembly has a great impact on the quality of aluminum doors and windows, and is the key process of supervision and inspection by the quality control department and quality inspection personnel. The assembly of aluminum doors and windows shall be based on design drawings and process technology cards. The specific quality control contents include:
① Door and window notch width control <2000mm is ± 1.0mm;
② The difference between the opposite side dimensions of the door and window notch <2000mm is ± 1.0mm;
<3500mm,>2000mm is ± 1.5mm;
③ Diagonal dimension difference of door and window notch <2000mm is ± 1.0mm;
<3500mm,>2000mm is ± 1.5mm;
④ Control of height difference in the same plane <0.5mm;
⑤ Assembly clearance control <0.3mm;
⑥ The opening and closing shall be flexible without blocking, and the opening and closing force shall be ≤ 50N;
⑦ Height deviation control <3500mm,>2000mm is ± 1.5mm;
> 3500mm is ± 2.0mm;
⑧ Accurate location of accessories;
⑨ The components and fittings are firmly connected, such as lock, wheel, hinge, handle, screw, etc;
⑩ The door and window finishes are of good quality without damage, sag, deformation, etc.