The wearing strip heat insulation aluminum profile is a composite product made by combining two pre-extruded aluminum profiles with an insulation strip. This integration is achieved through advanced composite processing technology, which plays a crucial role in determining the final quality of the insulated profile. In addition to the material quality, the level of technological expertise during the combination process is essential. Typically, this process involves four key stages: tooth cutting, threading, rolling, and inspection. Tooth cutting is one of the most critical steps. A hard roller gear mounted on a gear machine rolls teeth into the neck of the aluminum slot. The roller gear is driven by a motor via a transmission system, and its 60-degree tooth shape presses into the center of the aluminum slot, applying pressure to move the aluminum forward while simultaneously forming the teeth along the slot. The rolling gears can be adjusted vertically and horizontally using rails to accommodate different profile dimensions. Next, the insulation bar is inserted into the notches of the upper and lower aluminum profiles that have already been toothed. Some equipment integrates the stripping process into the gear machine, allowing the insulation strip to be inserted into the aluminum during the tooth-cutting stage. However, after this process, there may not be a tight bond between the insulation strip and the aluminum, leading to looseness and potential movement between the two components. In some cases, a set of toothed wheels drives the insulation strip into the slots of the aluminum profiles. For aluminum profiles where the distance between the centers of the two slots is less than 10 mm, it is challenging to use automated stripping machines, so manual methods are often required. The third step involves rolling, where the aluminum and insulation strips are combined using three sets of rolling plates on a press. During this stage, under the combined pressure of the rolling plates, the outer edges of the aluminum profiles are pressed against the insulation strip, with the neck root acting as the pivot point. The teeth on the hammer head are pressed into the insulation strip, ensuring a tight integration between the aluminum and the insulation material. Finally, the fourth step is inspection. After rolling, the dimensional accuracy of the aluminum profile is measured, and the longitudinal shear strength is tested, which is a key mechanical performance indicator. To perform the test, a 100mm-long sample is placed on a specialized longitudinal shear testing machine. An external force is applied to displace the insulation strip and aluminum from each other, and the load required for deformation is recorded. The longitudinal shear strength is expressed in N/mm. According to GB5237.6 "Aluminum Alloy Construction Profiles - Part 6: Insulation Profiles," the longitudinal shear strength of the heat-insulated aluminum profile should exceed 24 N/mm. To determine the characteristic value, a group of 10 test results is used, and the mean value is calculated after subtracting 2.02 times the standard deviation. Therefore, the consistency of the test results is vital to ensure that individual samples meet the required standards. The stability of the test values is closely related to both the reliability of the equipment and the quality of the aluminum material.
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