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布氏硬度測試

布式硬度測試是現(xiàn)今常用的硬度測試法中最古老的方法，此測試方法于1900年由瑞典工程師Johan August Brinell提出，廣泛應(yīng)用于判定鑄造件和鍛造件的硬度，因?yàn)殍T造件和鍛造件的晶粒結(jié)構(gòu)太粗糙而很難進(jìn)行準(zhǔn)確的洛氏和維氏測試。

布氏硬度測試條件具有大約25種不同的試驗(yàn)力/球壓頭的組合，對(duì)于幾乎所有的金屬，僅需球壓頭尺寸與試驗(yàn)力，即可對(duì)其進(jìn)行布氏硬度測試。只要球壓頭尺寸與試驗(yàn)力的比值保持不變，理論上布氏測量結(jié)果保持一致。

通常布氏硬度測試結(jié)果在工業(yè)中廣泛地用作商業(yè)運(yùn)輸驗(yàn)收依據(jù)和質(zhì)量控制。測試結(jié)果可能與金屬本身的特性相關(guān)，如：延展性，拉伸強(qiáng)度和耐磨性等。

布氏硬度測試是一種壓痕硬度測試，其包含了兩個(gè)步驟。

第一步，以一定的試驗(yàn)力將一定直徑的壓頭垂直地壓入試樣表面，將試驗(yàn)力保持一段時(shí)間，然后卸載。

第二步，測量至少兩條相互垂直的壓痕直徑，然后由壓痕直徑的平均值以及運(yùn)用特定的計(jì)算公式或基于此公式得出的圖表來算出布氏硬度值。

軼諾的NEXUS3100， 3001， 3200， 3300， 3400， 8100， 9603B系列的布氏硬度計(jì)由力傳感器閉環(huán)控制；均由軼諾的研發(fā)中心所研發(fā)，設(shè)計(jì)，并完成耐久測試。

BRINELL HARDNESS TESTER

The Brinell hardness tester uses the oldest method of hardness testing commonly used today. It was invented in Sweden by Dr. Johan August Brinell in 1900. This test is often used to determine the hardness of castings and forgings whose grain structure is too course for accurate Rockwell or Vickers testing.

Brinell hardness test conditions have approximately 25 different load/ ball combinations of testing allowing almost all metals able to be tested by way of Brinell test by simply varying the ball size and test force based on the sample’s dimension and design. In some cases, as long as the ball size to test force ratio remains constant, the results are considered accurate when changing between Brinell test conditions.

Results from the Brinell Hardness tester are used extensively in industry as a basis of acceptance of commercial shipments, and for quality control purposes . These results may correlate with other metallic characteristics such as: ductility, tensile strength, wear resistance, etc. Our Brinell hardness testers are able to withstand the most hars environments, if required with an air filtration system to protect the interior against dust.

BRINELL HARDNESS TESTING STEPS

The Brinell test can be simply explained as an indentation hardness test consisting of two basic steps.

Step one: Using A known indenter and a known force; apply the known force through the known indenter perpendicular to the material under test and hold the know force for specified amount of time(dwell).

Step two: Measure the diameter of the resulting indentation in at least two directions perpendicular to each other. The Brinell hardness value is then computed from the mean of the diameter measurements by the use of a mathematical formula designed for this purpose, or more frequently from a chart based on the formula.