第四章讨论了螺纹装配过程参数的设定和螺栓拧紧的控制方法及比较，并对拧紧控制方法的选用进行了分析。
In Chapter four, the parameter in the bolt fastening process is set down and the controlling methods and comparison is analyzed.
结合大功率柴油机性能强化的数值计算，在考虑螺纹的基础上建立了气缸盖螺栓的CAD装配体模型；
With the numerical simulation of heavy-duty diesel engine to strengthen performance, a CAD assembly model of cylinder head bolt is built based on the thread.
产品各部件采用快速接头和螺纹连接，使用时，装配只需1分钟左右即可连接完备。
Its parts are connected with quick joints and screw threads. When application, they can be assembled completely only within 1 minute or so.
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