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الكلية كلية الهندسة
القسم الهندسة الميكانيكية
المرحلة 3
أستاذ المادة عصام زهير فاضل الحاج يوسف
4/28/2011 4:34:35 PM
A rivet is a short cylindrical bar with a head integral
to it. The cylindrical portion of
the rivet is called shank or body
and lower portion of shank is
known as tail, as shown in Fig.
9.1. The rivets are used to make
permanent fastening between the
plates such as in structural work,
ship building, bridges, tanks and
boiler shells. The riveted joints
are widely used for joining light
metals.
The fastenings (i.e. joints)
may be classified into the following two groups :
1. Permanent fastenings, and
2. Temporary or detachable fastenings.
The permanent fastenings are those fastenings which can not be disassembled without
destroying the connecting components. The examples of permanent fastenings in order of strength
are soldered, brazed, welded and riveted joints.
The temporary or detachable fastenings are those fastenings which can be disassembled
without destroying the connecting components. The examples of temporary fastenings are screwed,
keys, cotters, pins and splined joints.
Methods of Riveting
The function of rivets in a joint is to make a connection that has strength and tightness. The
strength is necessary to prevent failure of the joint. The tightness is necessary in order to contribute to
strength and to prevent leakage as in a boiler or in a ship hull.
When two plates are to be fastened together by a rivet as shown in Fig. 9.2 (a), the holes in the
plates are punched and reamed or drilled. Punching is the cheapest method and is used for relatively
thin plates and in structural work. Since punching injures the material around the hole, therefore
drilling is used in most pressure-vessel work. In structural and pressure vessel riveting, the diameter
of the rivet hole is usually 1.5 mm larger than the nominal diameter of the rivet.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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