Product Overview
Mitech MHBRV-187.5 electric multifunctional hardness tester, based on the mechanical principle of positive pyramid diamond or spherical cemented carbide indenter pressing into the sample surface to produce indentation, realizing Brinell, Rockwell, Vickers three different materials hardness measurement by measuring the depth or diameter of the indentation. With novel appearance, full-featured, Rockwell hardness value can be directly read by the dial, Vickers, Brinell hardness values need to look up the table, easy operation, it can meet the needs of users of a variety of hardness testing. It is widely used in metal processing and manufacturing, various metal material’s failure analysis and other fields like colleges and research institutions. It is the new type multifunctional testing instrument for mental and part of the the non-metallic materials research and hardness test.
Function & application
l Used for quality control in metal processing manufacturing
l Used for failure analysis testing of metallic materials;
l Demonstration experiment for education and teaching in Colleges and Universities;
l Hardness testing of materials in scientific research institutions
Working Principle
Brinell hardness test: Test force(F) is on the steel ball with certain diameter(D) , pressed on sample surface. After a period of time, cancel the force. The indentation diameter is get by measuring with micrometer ocular,thus to calculate the average pressure(N/mm²).Then we can get the Brinell hardness.
Rockwell hardness test is a vertex angle of 120 ° diamond cone or a certain diameter of the hardened steel ball as a pressure to the specified test force will be pressed into the sample surface, according to the sample surface indentation depth to be measured The Rockwell hardness of metallic materials.
Micro-Vickers (or Knoop) hardness test principle is that put the provisions of the positive pyramid diamond indenter into the sample surface(with fixed experimental force) and maintain a certain length (holding), and then unloading. Finally, there is a positive quadrangular pyramid or kenup indentation with a square surface on the surface of the specimen. Then we can attain the area of indentation via measuring the length of the diagonal by a micrometer eyepiece. Then the corresponding Vickers (or Knoop) hardness values are obtained.
Working Conditions
l Operation Temperature：18～28℃;
l Relative Humidity：≤65％;
l Clean environment, no vibration;
l No corrosive media around.
Instrument Features
l Equipped with Brinell, Rockwell, Vickers three hardness test indenter, full-featured, widely used that can meet a variety of hardness testing needs of metal and non-metallic materials;
l High precision mechanical dial, easy to operation, intuitive display the test result;
l Unique displacement sensing system design, greatly reducing the error that produced by measure the depth of indentation;
l Adjustable cold light source measurement system that can control the light strength through the software;
l Consistent with GB/T230, GB/T231, GB/T4340, JJG144-1999, ISO 6508, ASTM E 10, ASTM E92, ASTM E18, ASTM E384, ASTM E103 and other relevant domestic and foreign standards.
Operating Method and Attentions
l Read the manual carefully before using the instrument. Learn the operation steps and attentions to avoid damage the instrument or personal safety accidents caused by improper operation.
l User should follow the operating procedures and calibrate the instrument repeatedly with the standard block before and after testing. If idled for a long time, the instrument should be calibrated several times after restarting, and then test the parts after the test result is stable;
l It is strictly prohibited to turn the variable loading handwheel when the instrument load or unload the test force. Rotating the handwheel forcibly will cause the internal gear dislocation, test force in chaos and even damage the internal parts of the instrument.
l When the test force is applied to the test specimen, It is strictly forbidden to decline or raise the screw to avoid damaging the indenter.
l The use period of the hardness block is one year. The distance between two adjacent indentions center or the distance from the indentation center to edge of specimen is not less than 3mm. Too closely distance will affect the test result.
l Pay attention to palm the instrument for carrying to forbid falling across. Please pull out the power plug and fix well the measuring lever, counterweight r and boom before carrying.
Instrument Maintenance
l When replacing the fuse or removing the counterweight, please turn off the power first.
l When not in use for a long time, please cover the dust cover to prevent dust into the instrument interior. And the hardness block, indenter should be coated with antirust oil to prevent rusting after using.
l The hardness tester should be calibrated at least once a year to ensure its accuracy.
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