Measurement Error of Handheld Brinell Hardness Tester

Measurement Error of Handheld Brinell Hardness Tester

Error factors of handheld Brinell hardness tester:
Indenter:
(1) Permanent deformation of steel balls;
(2) Diameter difference of steel ball;
(3) Corrosion, abrasion or scratch of steel balls;
(4) The part of the steel ball breaking out sleeve is less than one third of the suitable diameter of the californium ball;
(5) Overconcentricity of center line between steel ball and press handle.

Load:
(1) The knife is loose, charming or fractured;
(2) Overweight in weight;
(3) Load lever deformation;
(4) The three blades of the load lever are not on the same plane;
(5) Insufficient lifting distance at the top of the spindle makes the load not be tested by all the actors;
(6) Poor installation of hardness tester causes pile collision between weight and body
(7) Inclination of spindle.

Measuring device
(1) Incorrect marking or blurred marking of the dividing board;
(2) The magnification is not discussed;
(3) The lens is dirty or bloody;
(4) Differential cylinder screw wear;
(5) Zero position of differential cylinder is wrong;
(6) Improper understanding;
(7) Improper choice of maximum multiple.

Specimen:
(1) Insufficient surface finish;
(2) Work hardening;
(3) Surface decarbonization, the hardness is not uniform;
(4) The oxide layer on the surface has not been removed;
(5) K-test surface is not fair.

Experimental conditions:
(1) Room temperature does not meet the requirements;
(2) The speed of adding anthracene is not right;
(3) The load holding time is not right;
(4) Vibration.

Operator:
(1) Improper selection of workbench;
(2) Improper selection of twist and load;
(3) The distance between two adjacent indentations is too close, or the indentation is too close to the edge.


Related News
  • Use and Maintenance of Optical Glass Cuvette

    Use and Maintenance of Optical Glass Cuvette

    January 9, 20191. For example, if the solution in the optical glass cuvette is acid and it is not clean, wash it with weak alkali solution. If the solution is alkali and is not clean, wash it with weak acid solution...view
  • Common Faults and Countermeasures of Handheld Brinell hardness tester

    Common Faults and Countermeasures of Handheld Brinell hardness tester

    January 9, 20191. Causes and troubleshooting methods of the failure of Brinell hardness tester caused by load error exceeding (+1.0%) or instability: (1) If the force point blade is loose, the force point blade shou...view
  • UV-Visible Spectrophotometer Using Method

    UV-Visible Spectrophotometer Using Method

    January 4, 2019UV spectrophotometer can be widely used in water supply, environmental protection, disease control, atmosphere, third-party testing, chemical, industrial, quality inspection, scientific research insti...view
  • Light Transmittance Meter

    Light Transmittance Meter

    May 14, 2019Advantages of light transmittance meter1. Parallel optical path design is used to measure material with large thickness.2. The split probe is equipped with a fixed bracket, and has both fixed and spli...view