The screw is a tool that uses the physics and mathematical principles of the circular rotation of the object and the frictional force to gradually tighten the object. In use, it is often the case that the tooth and the tooth cannot be tightly sealed, the screw head is broken too much, or the striate is not tightly locked, and the use condition is not met, and the quality is a quality problem. So today I will talk to you about how the screw is used for strength torque testing.
Screw strength torque test:
1. Torque test: The torsion of a product is to demonstrate its ability to resist being twisted into two halves. All standards have the minimum requirements for the self-tapping screw torsion force. In this test, the screw is clamped on a torsion tester with a tapped middle splitter, and then the torque is applied with a torque wrench until the screw is broken. If the torque does not exceed the specified minimum requirements, the product is not qualified. Failed to indicate that the screw is too soft or the thread is too small.
2, lock test: This test is to lock the screw to a test board, the board has the specified hardness / thickness and aperture. If the screw is locked over the test board but the thread is deformed, the product is not acceptable. Failed display The surface hardening of the screws is too light or too soft.
3, lock torque test: This test is only required for screw-rolled screws. When the lock test was performed, the minimum lock torque of the test board was observed. If the torque exceeds the specified standard value (the standard value depends on the size of the screw / surface treatment), the product is unqualified. Failed to show that the surface of the screw does not have sufficient lubricity, or that the thread is not properly formed and requires greater torque.
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