Raw Material Procurement
Profile Selection: Select appropriate profiles according to usage requirements and budget. For aluminum alloy profiles, pay attention to indicators such as material and wall thickness. Generally, the wall thickness of aluminum alloy profiles for exterior building windows should be no less than 1.4mm, and for interior windows, no less than 1.2mm. The surface of high – quality profiles should be smooth, without obvious scratches, bubbles or other defects. Profile selection is the key to producing good products. It is definitely necessary to choose products with high visibility in the industry. Only by choosing materials recognized as good in the industry can the doors and windows produced have good quality.
Glass Selection: There are various types of glass, such as ordinary flat glass, tempered glass, insulating glass, etc. For doors and windows with sound – proof and heat – insulation requirements, insulating glass or laminated glass should be preferred. Tempered glass should have a 3C certification mark, and its surface should be flat, without obvious ripples, bubbles or other flaws. When selecting glass materials, try to choose those with good quality and those that are not easy to break. Even if they are impacted from the outside, they will not break easily.
Quality of Hardware Accessories: Although hardware accessories are small, they have a great impact on the performance of doors and windows. Hinges, handles, locks, etc. should be products of good quality and corrosion – resistant. Check whether the surface of the hardware accessories is smooth, whether there is rust, burrs, etc., and whether they open and close flexibly. Strictly select the materials of hardware accessories, especially the quality of door handles, because door handles are frequently used parts. Therefore, strict screening is required. For example, if the door handle is made of aluminum alloy, check whether the aluminum content of the aluminum alloy meets the standard. If it does not meet the standard, there is a high possibility that its service life will not be long.
Processing and Manufacturing Process
Dimension Precision Control: Process and manufacture doors and windows strictly in accordance with the design drawings to ensure the dimensional accuracy of doors and windows. The allowable deviation of the width and height dimensions of doors and windows is generally within ±2.5mm, and the difference in diagonal length should not be greater than 3mm. Precise dimension control is necessary to meet the requirements of customers. If the dimensions are too large or too small, it will affect the quality of doors and windows and the installation of decoration workers.
Welding and Assembly Quality: For aluminum alloy doors and windows, the welded parts should be firm, without problems such as false welding and missed welding. The surface of the weld should be smooth, without obvious pores, slag inclusions or other defects. During the assembly process, the connections of all components should be tight, with a uniform gap, and there should be no looseness. Use welding machinery and equipment, and try to use more sophisticated equipment, otherwise there may be some welding defects.
Surface Treatment: The surface treatment of doors and windows directly affects their aesthetics and corrosion resistance. Common surface treatment methods include spraying, electrophoresis, etc. The treated surface should have a uniform color, without phenomena such as sagging, blistering, peeling, etc., and the coating thickness should meet the relevant standard requirements. Regarding surface treatment, when spraying the aluminum alloy door and window frames, try to use materials with uniform spraying. Only with uniform spraying can the aluminum alloy surface be ensured not to be oxidized and have a longer service life.
Quality Inspection
Appearance Inspection: Mainly check whether the surface of the doors and windows is smooth, without defects such as scratches, bumps, deformation, etc., and whether the color is uniform. The joints of the doors and windows should be tight, without obvious gaps, and the sealing rubber strips should be installed firmly, without phenomena such as coming off the groove and distortion. After the doors and windows are produced, check the appearance one by one to ensure that the quality of this batch of products is maintained at a good level.
Performance Testing
Air – tightness Performance Testing: Use air – tightness performance testing equipment. With the doors and windows closed, fill a certain amount of air into the test space and measure the air permeability to judge the air – tightness performance of the doors and windows. Generally, the higher the air – tightness performance level, the better the sealing effect of the doors and windows. Testing the air – tightness of doors and windows can ensure the indoor temperature. For example, in summer, when it is hot and the air – conditioner is on indoors, the cold air will not escape; in winter, when it is cold and the doors and windows are well – sealed, the indoor heating will not escape, effectively maintaining a constant indoor temperature.
Water – tightness Performance Testing: Use water – tightness performance testing equipment to simulate rainfall of different intensities and conduct a sprinkling test on the doors and windows to observe whether there is any leakage. Under the specified test pressure, the doors and windows should not have serious leakage, and the water – tightness performance should meet the relevant standard requirements.
Wind – pressure Resistance Performance Testing: Use wind – pressure resistance performance testing equipment to apply different levels of wind pressure to the doors and windows, and test the deformation and damage of the doors and windows under the action of wind pressure. The wind – pressure resistance performance should be selected according to factors such as the height of the building and the wind load in the area, to ensure that the doors and windows can withstand the corresponding wind pressure during use.
Installation and Acceptance
Installation Process Supervision: Installation personnel should have professional skills and experience and operate strictly in accordance with the installation specifications. Before installation, check whether the size and flatness of the door and window openings meet the requirements. During the installation process, ensure that the levelness and perpendicularity of the doors and windows meet the standards, they are firmly fixed, and the sealant is applied evenly and densely.
Finished Product Protection: After installation, carry out finished – product protection for the doors and windows to avoid damage during subsequent construction. For example, paste protective films on the surface of the doors and windows to prevent scratching and contamination.
Acceptance Work: Organize professional personnel for acceptance. In addition to checking again whether the appearance, size, and installation quality of the doors and windows meet the requirements, also focus on checking whether the doors and windows open and close flexibly, whether the hardware accessories are used normally, and whether the sealing effect is good.