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螺丝为什么要拧三圈回半圈_家居日记
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螺丝为什么要拧三圈回半圈

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螺丝为什么要拧三圈回半圈 主要是为了防止螺丝出现松动，且回半圈是为了恢复弹性变形，消除预紧应力，螺钉通过连续加压或弹性变形变形后，塑性应力和失效的概率大大降低，


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