堆叠的LVL层需要与定制的木螺栓结合，但钻螺栓孔后木材被扭曲，需要花费较长时间，并且缺乏精确度，”Ban说。
The stacked LVL layers needed to be connected with custom wooden bolts, but to drill the bolt holes after the wood was warped would "take time and lack in accuracy, " Ban says.
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.
当气缸垫装在气缸体上，然后装上气缸盖以后，气缸盖螺栓就压紧软金属垫，这样结合处就完全密封了。
When the gasket is placed on the block and the head installed, tightening of the head bolts squeezes the soft metal so that the joint is effectively sealed.
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