Structure Shape The shape of the structure is the function of the standard fastener and the characteristics of its installation and use. The comparison of structure and shape is the first choice for standard fastener conversion. The difference in structure and shape will cause changes in the original design documents, which will bring difficulties to the localization work. Such conversion should be avoided as much as possible.
Basic size The basic size is a feature of the size and scope of use of standard fasteners. The comparison of the basic dimensions is a basic project for the conversion of standard fasteners. The basic size is different, which will cause changes in the original design documents, which will bring difficulties to the localization work. Such conversion should be avoided as much as possible. If the basic size range after conversion fails to cover the basic size before conversion, its scope of use will be limited, and it may not meet the selection requirements of the original introduction design documents. It should be considered as a key project for conversion and carefully selected.
Material grade (including heat treatment) material grade is an important indicator item for the bearing capacity of standard fasteners. The comparison of material grades is a key item in the conversion of standard fasteners. Different material grades will affect the ability of standard fasteners to withstand loads, causing faults such as breakage of standard fasteners during use. Bringing great harm to the product, it should be taken as a key item of transformation and carefully selected.
Technical conditions Technical conditions are important technical items for the technical requirements of standard fasteners and for verifying and accepting the functional and reliability requirements of their use. The comparison of technical conditions is an important project for standard fastener conversion. The difference in technical conditions, especially the design load or guaranteed load and acceptance test method, will affect the function and reliability of standard fasteners. The quality of the standard fasteners should be considered as an important item for conversion, and the selection should be carefully examined.
Thread precision thread accuracy is an important technical performance index for the matching performance of fasteners. The comparison of thread precision is extremely important for the conversion of standard fasteners. The difference in thread precision will affect the degree of tightness of the thread and cause looseness and affect the quality of the product. Therefore, it should be considered as one of the main contents of the transformation. The surface treatment surface treatment is an important performance index item that levies the anti-corrosion ability of standard fasteners to meet the requirements of the use environment. The comparison of the surface treatment is important because the surface treatment is different, which will affect the corrosion resistance of the standard fasteners and disable the standard fasteners. It should be considered as the main item of conversion.
Other standard names, general structural dimensions, surface roughness, weight and marking methods, etc., as general items, will not have a significant impact on the function and performance of standard fasteners, but should also be analyzed.
Control analysis method and explanation (1) Method preliminary comparison: According to the four main items of structure shape, basic size, material grade and technical condition, the corresponding Chinese standards are searched according to foreign standards, and comparison is made to select a suitable comparative analysis standard. Detailed comparison: The selected standards will be compared with the Chinese fastener standards according to the items listed in the foreign fastener standards.
(2) Explain that the foreign fastener standard is mainly compiled into a standard by a material grade, while the Chinese standard is based on a structural shape as a standard. In the comparative analysis, there may be a standard corresponding Several foreign standards. Foreign fastener standards appear in a full range of sizes, such as washers, and a nominal size corresponds to several diameters and thicknesses. In the comparative analysis, it is difficult to find a Chinese standard that completely corresponds to it, and it can only be explained in the conversion use.
The size series used in the preparation of foreign fastener standards is different from the Chinese standard. In the comparative analysis, there will be one standard corresponding to several Chinese standards. The comparison of the material grades should be compared with the existing research results as much as possible, but some material grades can not find the results data, and can only be compared from the chemical composition and performance, and the mechanical properties are not lower than the foreign material standards. To establish an alternative relationship.
The general structural dimensions of the fasteners are not consistent with the size series selected by the foreign fastener standards and the Chinese fastener standards. It is very difficult to fully correspond, only under the condition that the basic dimensions and specifications of the fasteners are the same. The general structural dimensions are as uniform or close as possible. The results of the second comparative analysis are based on the item-by-item comparison analysis of each fastener standard. According to the degree of comparison between the primary and secondary items, the effects on the functional properties and performance of the fasteners are comprehensively investigated. Convert to varying degrees.
Conclusion The key to the implementation of fasteners to convert foreign standards into Chinese standards is that the standards should be consistent or equivalent; the quality of Chinese fasteners after conversion is consistent with or comparable to the quality of foreign fasteners before conversion. To this end, it is necessary to divide the primary and secondary projects according to the foreign standards and the actual conditions of the Chinese standards, and to determine the type of transformation according to the degree of correspondence.
1. Technical standard: BS EN 10202, DIN EN 10203, GB/T2520 , JIS G3303
2. Steel type: MR, SPCC
3. Thickness: 0.115 - 0.50 mm
4. Width: 600 - 1050 mm
5. Length: 600-1200mm
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