论文部分内容阅读
在现代的螺纹标准中,外螺纹的牙底已成为一项重要的内容。新国标普通螺纹GBl97—8l对螺纹的牙底形状专门列出一节加以规定,我部正在制订的航空用MJ加强螺纹标准,对螺纹的牙底形状更是作为一项重要的指标加以严格的要求。(一)螺纹牙底形状与疲劳强度近代的机械及结构物常承受高速度交变载荷。实践证明,在交变载荷作用下构件的破坏形式经常是疲劳破坏。螺纹连接是机械产品上一种重要的连接形式,许多载荷的传递常需通过螺栓来实现。因此,提高螺纹的疲劳强度就成了当今螺纹标准制订中的重要内容。
In the modern thread standard, the external thread of the tooth base has become an important content. The new national standard GBl97-8l ordinary tooth thread on the tooth bottom shape of a section specifically to provide for the provisions of the Ministry of Aviation is to develop MJ to strengthen thread standards, the tooth bottom shape is even more important as an important indicator to be strict Claim. (A) thread bottom shape and fatigue strength Modern machinery and structures often bear high speed alternating load. Practice has proved that under alternating load under the form of damage to the components often fatigue damage. Threaded connections are an important form of connection to mechanical products and many loads are often transmitted through bolts. Therefore, to improve the fatigue strength of the thread has become an important part of today’s thread standards.