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Sổ tay tiêu chuẩn thiết kế máy P26

Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p26', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 22_ UNTHREADED FASTENERS Joseph E. Shigley Professor Emeritus The University of Michigan Ann Arbor Michigan 22A RIVETS 22.1 22.2 PINS 22.8 22.3 EYELETS AND GROMMETS 22.10 22.4 RETAINING RINGS 22.16 22.5 KEYS 22.24 22.6 WASHERS 22.26 REFERENCES 22.29 22.1 RIVETS A rivet is a fastener that has a head and a shank and is made of a deformable material. It is used to join several parts by placing the shank into holes through the several parts and creating another head by upsetting or deforming the projecting shank. During World War II Rosie the Riveter was a popular cartoon character in the United States. No better image can illustrate the advantages of riveted joints. These are 1. Lowcost 2. Fast automatic or repetitive assembly 3. Permanent joints 4. Usable for joints of unlike materials such as metals and plastics 5. Wide range of rivet shapes and materials 6. Large selection of riveting methods tools and machines Riveted joints however are not as strong under tension loading as are bolted joints see Chap. 23 and the joints may loosen under the action of vibratory tensile or shear forces acting on the members of the joint. Unlike with welded joints special sealing methods must be used when riveted joints are to resist the leakage of gas or fluids. 22.1.1 Head Shapes A group of typical rivet-head styles is shown in Figs. 22.1 and 22.2. Note that the button head the oval head and the truss head are similar. Of the three the oval head has an intermediate thickness. 22.1 22.2 STANDARD HANDBOOK OF MACHINE DESIGN FIGURE 22.1 Standard rivet heads with flat bearing surfaces a Button or round head b high button or acorn head c cone head d flat head e machine head oval head g large pan head h small pan head t steeple head truss head thinner than oval head. FIGURE 22.2 Various rivet heads d Countersunk head b countersunk head with chamfered top c countersunk head with round top d globe head. A large rivet is one that has a shank diameter of l in or more such .