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Sổ tay tiêu chuẩn thiết kế máy P31

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Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p31', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 26 GASKETS Daniel E. Czernik Director of Product Engineering Fel-Pro Inc. Skokie Illinois 26.1 DEFINITION 26.1 26.2 STANDARD CLASSIFICATION SYSTEM FOR NONMETALLIC GASKET MATERIALS 26.1 26.3 GASKET PROPERTIES TEST METHODS AND THEIR SIGNIFICANCE IN GASKETED JOINTS 26.2 26.4 PERMEABILITY PROPERTIES 26.3 26.5 LOAD-BEARING PROPERTIES 26.7 26.6 ENVIRONMENTAL CONDITIONS 26.12 26.7 GASKET DESIGN AND SELECTION PROCEDURE 26.13 26.8 GASKET COMPRESSION AND STRESS-DISTRIBUTION TESTING 26.22 26.9 INSTALLATION SPECIFICATIONS 26.23 REFERENCES 26.23 In the field of gaskets and seals the former are generally associated with sealing mating flanges while the latter are generally associated with sealing reciprocating shafts or moving parts. Some designers refer to gaskets as static seals and consider seals to be dynamic sealing components. This chapter covers gaskets and Chap. 17 discusses seals. 26.1 DEFINITION A gasket is a material or combination of materials clamped between two separable members of a mechanical joint. Its function is to effect a seal between the members flanges and maintain the seal for a prolonged period. The gasket must be capable of sealing mating surfaces must be impervious and resistant to the medium being sealed and must be able to withstand the application temperature. Figure 26.1 depicts the nomenclature associated with a gasketed joint. 26.2 STANDARD CLASSIFICATION SYSTEM FOR NONMETALLIC GASKET MATERIALSf This classification system provides a means for specifying or describing pertinent properties of commercial nonmetallic gasket materials. Materials composed of Re 26.1 ANSI ASTM F104 . 26.1 26.2 STANDARD HANDBOOK OF MACHINE DESIGN FIGURE 26.1 Nomenclature of a gasketed joint. asbestos cork cellulose and other organic or inorganic materials in combination with various binders or imprégnants are included. Materials normally classified as rubber compounds are not included since they are covered in ASTM Method D 2000 SAE J200 . Gasket coatings are not

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