Fastener_Torque_and_Fastening_(紧固件 扭矩问题)解析

XX.Y
Material Minimum Ultimate Tensile Strength (UTS) = XX * 100 Mpa 材料最小极限抗拉强度 (UTS) ＝ XX * 100 兆帕 Material Yield Strength (YS) = UTS * .Y Mpa 材料屈服强度 (YS) ＝ (UTS) * .Y 兆帕 Material proof Strength (PS) = YS * .9 Mpa 材料保证载荷 (PS) ＝ YS * .9 兆帕
Weld Nuts
Zhang Haoyi
7
Feb 28, 2006
Fastener Introduction
Push Pins
Retainers
Clips
Zhang Haoyi
8
Feb 28, 2006
Fastener Introduction
Straps
Studs
Application Specific Fasteners
Zhang Haoyi
5
Feb 28, 2006
Fastener Categories
According to different usage, shape and material, Fastener can be divided into following categories briefly： 根据使用，外形和材料的不同，紧固件可以被大致分为以下几种类型： Bolts and Screws Bolts
Zhang Haoyi
9
Feb 28, 2006
Stress Markings
The head of bolt is marked with two numbers that indicate material properties used to define basic mechanical properties. 螺栓的头部标示了两个数字来表示定义基本机械特性的材料特性。
Improve Reliability
Reduce Costs (direct and indirect)
Government Regulation Compliance Complexity Reduction
复杂程度减低
7.
Eliminate the need for “fixes”
减除了“安装”的需要
ABC about Fastener, Torque and Fastening on-site Issues 紧固件,扭矩和现场问题基础
Zhang Haoyi
1
Feb 28, 2006
Fastener Introduction
Every year we hear about issues related to the design or assembly of fastened joints. These issues bring us much trouble in on-site assembly, product liability, vehicle durability, even redesign. Fastener attention peaks when a catastrophic bolted joint failure occurs. This presentation is designed to raise the awareness of the need for proper joint design and validation.
3.
Act as a pivot/sheer point for the attachment of brackets, tethers, belts
在支架，绳，带连接中，类似一个支点/转向点
4.
Connect hydraulic and other fluid lines to their respective components 将液压的和其他液体管线连接到他们各自的零部件上
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每年我们都可以听说与紧固连接件的设计和安装相关的问题。这 些问题给我们的零件安装，产品可靠性，整车耐久性带来了许多 麻烦，甚至导致重新设计。当一个灾难性的螺栓连接失效发生时， 紧固件就受到高度关注。这个报告主要用来提高工程师的意识， 以进行正确的连接设计和验证。
Zhang Haoyi
2
Feb 28, 2006
Fastener Introduction
Advantages of Proper Joint Design 正确连接件设计的好处
1. 2. 3. 4. 5. 6. Customer Satisfaction Mass Reduction 客户满意
重量减少 可靠性提高 成本减少（直接和间接） 符合政府法规
Zhang Haoyi
3
Feb 28, 2006
Fastener Introduction
Why we need fasteners? 为什么我们需要紧固件?
1. Joint different materials together
将不同的材料连接起来 2. Act as a heavy spring to keep components from slipping relative to one another 类似一个大弹簧，连接零部件以避免相互滑动
5.
Allow for disassembly 允许拆卸
Zhang Haoyi
4
Feb 28, 2006
Fastener Introduction
What must a fastener do？ 紧固件必须做些什么？
1. Survive Assembly 起到连接的效果 2. Provide clamp load (or other joint performance criteria) to resist any type of joint failure 提供拉紧力（或者其他连接性能标准）来防止任何性质的连接失效 3. Incorporate specific corrosion protection and lubrication characteristics 具备具体的腐蚀保护和润滑特性
Machine Thread Screws
Tapping Screws
Zhang Haoyi
6
Feb 28, 2006
Fastener Introduction
Nuts Free Spinning Nuts Lock Nuts
Pierce Nuts
Push-In Nuts
U Shaped Nuts