Difference between "C" slot and "U" slot in aluminum alloy doors and windows

【China Aluminum Industry Network】 Currently, there are U-type and C-type hardware slots for aluminum alloy door and window profiles on the market. The use of aluminum alloy doors and windows originates from the introduction of European aluminum alloy door and window systems, in European aluminum alloy door and window systems. Only the European standard slot is a kind of aluminum alloy special hardware slot, which is now the so-called "C" slot in the Chinese market; U-type hardware slot is a European standard slot for plastic steel doors and windows, due to the special material and structure of aluminum alloy door and window hardware Requirements lead to high prices of aluminum alloy doors and windows hardware, while steel doors and windows hardware prices are lower than aluminum alloy doors and windows hardware by about 40%, so there are aluminum alloy manufacturers will be steel doors and windows of the metal slot into the aluminum alloy doors and windows profile also appeared Aluminum alloy door and window "U" type slot. The reasons why 3X Europe's aluminum alloy door and window systems do not use U-shaped notches include the following: 1. Hardware design principle of U-shaped notch: U-shaped notch (hardware) is a special metal notch for plastic doors and windows and wooden doors and windows in Europe, and the U-notch hardware connection is installed by self-tapping screws. Hardware. However, if it is applied to aluminum alloy doors and windows, when the self-tapping screws installed in the U-channel hardware carry the longitudinal shear force generated by the door and window switch, the hardness of the self-tapping screws is much larger than that of the aluminum alloy profiles, and the self-tapping screws The buckle will cause damage to the aluminum alloy profile, causing the mounting hole to expand. For a long time, the screw connection of the hardware will cause a trip. Since the steel-lined doors and windows have steel lining, the hardness of the material and the self-tapping screws are equal to the expansion of the mounting hole and the phenomenon of hardware tripping. Because the U-shaped notch (hardware) applied to the aluminum alloy doors and windows does not meet the mechanical design principles of mechanical design, due to the safety of doors and windows hardware, European aluminum alloy doors and windows do not use U-shaped notch (Hardware) . 2. Hardware of U-shaped notch causes corrosion of aluminum alloy doors and windows. The material of the U-shaped notch hardware is steel. When the hardware is connected to the aluminum profile by steel tapping nails, it will happen when it is eroded by rain and moist air. The more obvious chemical reaction (as the so-called naphtha phenomenon) affects the use of doors and windows and destroys the waterproof structure of doors and windows. 3. The advanced design principle of C-notch hardware: The C-slot hardware installation is based on the stainless steel nail top tightness and machine screw stainless steel lining and hardware notch clamping force to ensure the firmness of the installation of hardware, stainless steel nail tight A local deformation of about 0.5 to 1.0 mm will occur on the surface of the profile so that the stainless steel nail and the aluminum profile are tightly combined to ensure that the hardware will not be displaced when subjected to force. 4. C-shaped notch hardware is easy to install: it does not need to use mounting holes, does not use self-tapping screws, and is easy to install. It has low dependence on the auxiliary conditions of equipment (electricity and gas) and can be installed on site. 5, material contrast: C-type notch hardware is a dedicated aluminum (metal) door and window hardware, and U-notch hardware from plastic doors and windows, from the requirements of the material to hardware rod hardness requirements are lower than the C-slot Port hardware. For example: The hardware of the C slot hardware is mainly extruded aluminum, zinc die-cast alloy, carbonitriding steel, stainless steel, molybdenum disulfide nylon, surface treatment for Dacromet surface treatment, RAL surface color spray (with Ferrari Chassis anti-corrosion treatment is the same) After strict corrosion resistance test, no soda phenomenon will occur. 6, C-type notch hardware connection structure safety: C-type notch hinge with high hardness stainless steel lining (the lining adopts a special structure), when the fastening screw is tightened, the special structure on the lining will be like a tooth Biting into the surface of the aluminum alloy profile forms a number of local deformations (small pits) of 0.2-0.5 mm, which guarantees the safety of the sash and eliminates the occurrence of tripping due to the hardness of connecting screws and aluminum profiles and the appearance of a flat open window (door ) The window (door) fan falls off.