Criteria for Hardness of Aluminum Profiles Are Inappropriate
(1) Quality definition angle
ISO9000:2000 "Quality Management System Basis and Terminology" stipulates that "quality" is defined as "a set of inherent characteristics that meet the requirements", "characteristics" is "distinguishing characteristics", "requirements" are "explicit, usually "Implicit or necessary requirements or expectations", aluminum wall thickness is an important indicator of quality characteristics, "requirements" are mainly reflected in customer requirements, engineering design needs. For customers, the wall thickness greater than 1.4mm does not mean that the requirements are met. Under the premise of meeting the engineering design requirements, the wall thickness is as small as possible, which is a good quality. For engineering design, the safety factors are related to the cross-section structure of aluminum profiles, door and window (curtain wall) structure, cross beam span, and glass area. The requirements for wall thickness of aluminum profile should be changed according to the use position and the use status. The aluminum profile wall thickness is greater than 1.4. Mm does not necessarily meet the safety requirements, less than 1.4mm can also meet the safety needs in a considerable part of the project. Calculating the wall thickness of aluminum profiles through the state of engineering use is a more scientific method.
(2) Energy perspective
At present, China's GDP accounts for 1/30 of the world's total GPD, but the consumption of steel accounts for 1/4 of the world's total, aluminum ingot accounts for 1/4, coal accounts for 1/3, and cement accounts for 1/2. The economic development is based on the large amount of energy consumed.
The rigid provision of aluminum wall thickness has increased the consumption of lower aluminum materials for some projects, which has played a role in wasting energy.
Therefore, the standard rigidly stipulates the wall thickness of aluminum profiles, which does not meet the energy saving, can not protect the interests of customers, can not meet the needs of engineering design, can not coordinate the contradiction between the quality control of production enterprises and market demand, from the perspective of market economy, it is unscientific .
6 Conclusion
(1) When the profile is used as a stress member, the wall thickness of the profile shall be selected by calculation according to the conditions of use. Aluminum alloy doors and windows bearing components should be determined by experiment or calculation.
(2) The production enterprise should clearly identify the main profile and the main force components of the cross section during design, and carry out quality control of the aluminum profile wall thickness in the production.
(3) Fully understand the regulations governing the wall thickness of aluminum profiles by national standards, industry standards, local standards and corresponding laws and regulations, and ensure that product quality meets relevant regulations and that construction costs can be reasonably controlled.
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