It is described why the hardness of a non-cutting tool is measured.
For a cutting tool - it’s clear why. And for parts, such as gears and bearings, where there is wear from friction, it is also understandable.
Why do they measure the hardness of other parts, for example, bolts?
The hardness of bolts and studs is not important. They need strength. And the drawings indicate hardness.
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Strength and hardness are different properties of a material.
Hardness is the ability of a material to resist the penetration of another, harder body into it under load.
And strength is the ability of a material to resist the destructive effects of external forces.
Why is strength needed, but hardness is measured and indicated?
The fact is that the strength of materials can only be determined by destroying samples in laboratory conditions. This is not always possible, it is expensive.
And hardness is quite easy to measure. Hardness testing is a non-destructive, cheap, simple and fast testing method that can, moreover, be carried out on a finished part.
The relationship between the strength of a metal and its hardness is widely known, and the relationship between these parameters for steels is indicated in GOST 22761-77.
By measuring the hardness of a material using any method: Brinell, Vickers or Rockwell, you can determine the strength of the material.
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Негізгі бет Ғылым және технология Relationship between strength and hardness
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