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Digital Brinell Hardness Testing Machine , Hardness Checking Machine MHBRVS-187.5

Digital Brinell Hardness Testing Machine , Hardness Checking Machine MHBRVS-187.5

Brand Name: Mitech
Certification: GB,JJG,ASTM,ISO..
Model Number: MHBRVS-187.5
Minimum Order Quantity: 1 piece
Delivery Time: 5-8 work days
Payment Terms: T/T, Western Union,PayPal
Mitech CO.,LTD.
Site Member
Beijing Beijing China
Business type: Manufacturer
Room E506, YingChuangDongLi Park, 1# of ShangDi East Road, Haidian District, Beijing, China
Supplier`s last login times: within 32 hours

Mitech MHBRVS-187.5 Digital Brinell Rockwell & Vickers Hardness Tester

Overview

Mitech MHBRVS-187.5 digital multifunctional hardness tester, based on the mechanical principle of conical 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, high sensitivity touch screen design, equipped with embedded operating system, simple and intuitive to meet the needs 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.

Technical Parameters

Technical specificationsTechnical Parameters
Preliminary testing force98.07N(10kgf)
Brinell testing force306N(31.25kg),613N(62.5kg),1839N(187.5kg)Tolerance±1.0%
Rockwell testing force588N(60kg),980N(100kg),1471N(150kg)Tolerance±1.0%
Vickers testing force294N(30kg), 980N(100kg)Tolerance±1.0%
Measuring Range for Brinell8HBW~650HBW
Measuring Range for Rockwell20HR~100HR
Measuring Range for Vickers14HV~1000HV
Diamond indenter specificationsDiamond Rockwell indenter, diamond Vickers indenter
Steel ball indenter specificationsφ1.5875mm,φ2.5mm,φ5mm
Brinell scale

HBW2.5/31.25, HBW2.5/62.5,

HBW2.5/187.5, HBW5/62.5

Rockwell scaleHRA, HRB, HRC, HRD, HRE, HRF, HRG, HRK, HRH
Vickers scaleHV30, HV100
Testing Force Application ModeAutomatic (loading, holding, unloading)
Indenter objective lens conversion modeManual operation
Micro-objective Magnification2.5X(Observing), 5X(measuring)
Eyepiece magnification15x
Duration time2~60s
Maximum height of specimen200mm(Brinell, Vickers),260mm(Rockwell)
Maximum distance of indentor to main unit165mm
VoltageAC220V±5%,50-60Hz
Dimensions520*215*700mm
Total Weight80kg

Indication error and repeatability

ScaleHardness range of standard blockIndication toleranceIndication repeatability error
HRA

20~ 40HRA

40~ 75HRA

75~ 88HRA

±2.0HRA

±2.0HRA

±1.5HRA

≤0.02(100-H)

or 0.8HRC

HRB

20~ 45HRB

45~ 80HRB

80~100HRB

±4HRB

±3HRB

±2HRB

≤0.04(130-H)

or1.2HRC

HRC20HRC~ 70HRC±1.5HRC

≤0.02(100-H)

or 0.8HRC

HBW

≤225HBW

> 225HBW

±2.5%

±2.0%

0.025`d
0.02`d
HV

≤225HV

225~ 300HV

≥300HV

±3%

±3%

±2%

≤6.0%

≤4.0%

≤4.0%

Note: H: Standard hardness value for standard block

`d:The average value of the indentation diameter

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.

Brinell working principle Figure


Rockwell working principle figure Vickers working principle figure

Brinell, Rockwell, Vickers hardness values can be converted according to the following formula:

Features

  • Equipped with Brinell, Rockwell, Vickers three hardness test indenters, full-featured, widely used, it can meet hardness testing needs for various metallic and non-metallic materials.
  • With high sensitivity touch display, easy for operation, it can display the test result intuitively.
  • Unique displacement sensing system design greatly reduces the error of the test result obtained by the indentation depth.
  • Designed with adjustable cold light source measuring system, it can control the light strength through the software;
  • Equipped with high-speed thermal printer to print test results in real time.
  • 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.

Scope of application

  • The Brinell indenter is mainly applied to the Brinell hardness testing for metallic materials like cast iron, forged steel and etc.
  • The Rockwell indenter is mainly applied to Rockell hardness testing of harden steel, quenched and tempered steel, annealed steel, cold rolled steel, hard aluminum alloy, nonferrous metals, hardened steel sheet, soft metal and other workpeice with surface treatment.
  • The Vickers indenter is mainly used for Vickers hardness testing for the small and thin parts, surface coating and workpeice with surface heat treatment.

Applications

  • Used for quality control in metal processing manufacturing
  • Used for failure analysis testing of metallic materials;
  • Demonstration experiment for education and teaching in Colleges and Universities;
  • Hardness testing of materials in scientific research institutions

Working Conditions

  • Operation Temperature:18~28℃;
  • Relative Humidity:≤65%;
  • Clean environment, no vibration;
  • No corrosive media around.

Configurations

NO.NameQTY.Remarks

Standard Configuration

1Main unit1
2Rockwell diamond indenter1
3Vickers diamond indenter1
4Hard alloy steel ball indenter φ1.5875mm, φ2.5mm, φ5mm3
5Large Testing Table1For Rockwell hardness test
6Medium Testing Table1For Rockwell hardness test
7V-shape Testing Table1For Rockwell hardness test
8Standard Rockwell hardness blocks3
9Standard Brinell hardness block1
10Standard Vickers hardness block1
11Counterweight5Numbers 0 to 4
12Objective lens22.5X, 5X
13Measuring microscopic115X
14Microscope seat1
15Slipped Table1
16Cone-shape Table1
17Standby LED lighting bulb2
18Fuse(2A)2
19Lighting head1
20Lighting shade1
21Power cable1
22Plastic dust cover1
23Attached files1
24Host accessories box1

Maintenance and care

  • 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.
  • 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;
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • When replacing the fuse or removing the counterweight, please turn off the power first.
  • 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.
  • The hardness tester should be calibrated at least once a year to ensure its accuracy.
  • Don’t disassemble the instrument without authorization, maintenance related matters please contact MITECH after-sale service department with 4000600280.


Product Tags:

hardness testing equipment

      

hardness measuring device

      

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