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Hardness is a very important feature of manufactured products, and there are many things at Northern Industrial we do to ensure that our product meets the required hardness for the application. The first is ensuring we select supply chain partners that are certified, and sends certifications with their product. We also have the capability of measuring the hardness of our product on our lab certified hardness surface gauges.
Northern Industrial Manufacturing ensures the product hardness is maintained throughout the production process using a series of in-process checks. At Northern Industrial Manufacturing, we leverage layered thickness checks throughout the entire manufacturing process. This attention to detail has won us awards like the GM Global Supplier Excellence Award, and ZF Supplier of the year.
Northern Industrial Manufacturing’s extensive array of part testing capabilities will bring your components to market on time and within budget at the highest level of quality possible. With a goal of being the automotive industry’s “go to” source for high quality parts manufacturing, we would love to provide you a competitive quote.
Hardness is an important property of metal materials and where the part is resistant to plastic deformation. There are three testing methods for hardness: scratch hardness, indentation hardness, and rebound hardness.
Scratch hardness is the metal material’s resistance to plastic deformation from scratching or abrasion, especially by sharp objects or tools. It is only possible for harder materials to scratch softer materials. One of the tools used to measure the scratch hardness is the sclerometer. The sclerometer microscopically measures the width of the scratch made by a diamond scratcher. There are three scales made for the scratch hardness, Moh’s scale, Ridgeway’s scale, and Wooddell’s scale.
Indentation hardness is the metal material’s resistance to plastic deformation from indentation or compression, especially by sharp objects or tools. The testing method for indentation hardness consists of the tip of a sharp tool, controlled by force or displacement, indenting the material to create a curve. There are a couple of scales used for indentation hardness of metallic materials. These tests that are used for metallic materials are Vickers, Rockwell, and Brinell.
Rebound hardness is the metal material’s resistance to plastic deformation from “bounces”. These “bounces” are caused by a hammer tipped with diamonds dropped on it from a certain height. The rebound hardness of metal materials is measured by the scleroscope. The scleroscope drops a steel ball from a certain height onto the measured material. The ratio of the impact velocity and rebound velocity, both measured by a magnetic inducer, is used to calculate the hardness. The test scales used for the rebound hardness are the Lee rebound hardness and Bennett hardness tests.
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