Touch Screen Brinell Digital Hardness Tester with Bluetooth Transferring and Printer

Features:

SHB-3000D is a half automatic and intelligent Brinell hardness testing machine, it adopts the load cell to replace the traditional quality weight, this innovative design makes the instrument more accurate.

SHB-3000D selection of testing force and dwell time is controlled and monitored on the front panel, it is automatic during the process of loading, dwell and unloading.

SHB-3000D adopts digital Brinell microscopes with adjustable LED illuminator, it doesn't need the operator to read the detail length of indentation, it only needs operator to aim the D1, D2 diagonal of indentation and press the length key twice above the Microscope, then the built-in computer can compute the Brinell scale and display the final testing result on LCD display automatically.

The Brinell hardness test method consists of indenting the test material with a 10 mm diameter
hardened carbide ball subjected to a load of 3000 kg. For softer materials the load can be reduced
to 1500 kg or 500 kg to avoid excessive indentation.

The full load is normally applied for 10 to 15 seconds in the case of iron and steel and for at least
30 seconds in the case of other metals. The diameter of the indentation left in the test material
is measured with a low powered microscope. The Brinell harness number is calculated by dividing
the load applied by the surface area of the indentation.

The diameter of the impression is the average of two readings at right angles and the use of a Brinell
hardness number table can simplify the determination of the Brinell hardness. A well structured Brinell
hardness number reveals the test conditions, and looks like this, "75 HB 10/500/30" which means that
a Brinell Hardness of 75 was obtained using a 10mm diameter hardened steel with a 500 kilogram
load applied for a period of 30 seconds.

On tests of extremely hard metals a tungsten carbide ball is substituted for the steel ball. Compared to
the other hardness test methods, the Brinell ball makes the deepest and widest indentation, so the test
averages the hardness over a wider amount of material, which will more accurately account for multiple
grain structures and any irregularities in the uniformity of the material. This method is the best for
achieving the bulk or macro-hardness of a material, particularly those materials with heterogeneous structures.