Basic Info.
Origin
Beijing, China (Mainland)
Product Description
Mitech MHBRV-187.5 Electric Multifunctional Hardness TesterOverview
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.Technical Parameters
| Technical specifications | Technical Parameters |
| Preliminary testing force | 98.07N(10kgf) |
| Brinell testing force | 306N(31.25kg),613N(62.5kg),1839N(187.5kg)Tolerance±1.0% |
| Rockwell testing force | 588N(60kg),980N(100kg),1471N(150kg)Tolerance±1.0% |
| Vickers testing force | 294N(30kg), 980N(100kg)Tolerance±1.0% |
| Brinell measuring range | 8HBW~650HBW |
| Rockwell measuring range | 20HR~100HR |
| Vickers measuring range | 8HV~2900HV |
| Brinell scale | HBW2.5/31.25,HBW2.5/62.5, HBW2.5/187.5,HBW5/62.5 |
| Rockwell scale | HRA ,HRB,HRC,HRD,HRE,HRF,HRG,HRK,HRH |
| Vickers scale | HV30 ,HV100 |
| Diamond indenter specifications | Diamond Rockwell indenter, diamond Vickers indenter |
| Steel ball indenter specifications | φ1.5875mm,φ2.5mm,φ5mm |
| Testing Force Application Mode | Automatic (loading, holding, unloading) |
| Indenter objective lens conversion mode | Manual operation |
| Display features | Classic mechanical dial |
| Microocular magnification | 2.5X(Observing), 5X(measuring) |
| Eyepiece magnification | 15x |
| Test force holding time | 2~60s |
| Max sample height | 200mm(Brinell, Vickers),260mm(Rockwell) |
| Maximum distance of indentor to main unit | 165mm |
| Voltage | AC220V/50Hz |
| Dimensions | 525*240*760mm |
| Total Weight | 80kg |
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
positive quadrangular pyramid diamond indenter
Specimen
Indentation
120°
Brinell, Rockwell, Vickers hardness values can be converted according to the following formula:
HV=constant×test force / indentation surface area≈0.1891 F/d2
In a formula: F-Test force on steel ball,unit:N
D-Diameter of steel ball ,unit:mm
d-Indentation diameter,unit:mm
0.102-Rule coefficient
In a formula: c, a constant (for HRC, HRA, c is 0.2; for HRB, c is 0.26)
H: the plastic deformation caused by the main test force causes the
indenter to press into the depth of the material surface
0.002: 0.002 mm indentation depth as a hardness unit
In a formula: F, test force (N)
d, the arithmetic mean of of the two diagonal d1, d2
Feautures - 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;
- High precision mechanical dial, easy to operation, intuitive display the test result;
- Unique displacement sensing system design, greatly reducing the error that produced by measure the depth of indentation;
- Adjustable cold light source measurement system that can control the light strength through the software;
- 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:18~28ºC;
- Relative Humidity:≤65%;
- Clean environment, no vibration;
- No corrosive media around.
Configurations | | NO. | Name | QTY. | Remarks |
Standard Configuration | 1 | Main unit | 1 | |
| 2 | Rockwell diamond indenter | 1 | |
| 3 | Vickers diamond indenter | 1 | |
| 4 | Carbide ball indenter φ1.5875mm, φ2.5mm, φ5mm | 3 | |
| 5 | Big platform | 1 | For Rockwell hardness test |
| 6 | Middle platform | 1 | For Rockwell hardness test |
| 7 | V type platform | 1 | For Rockwell hardness test |
| 8 | Standard Rockwell hardness blocks | 3 | |
| 9 | Standard Brinell hardness blocks | 1 | |
| 10 | Standard Vickers hardness blocks | 1 | |
| 11 | Weights | 5 | Numbers 0 to 4 |
| 12 | Objective lens | 2 | 2.5X, 5X |
| 13 | Measuring microscopic | 1 | 15X |
| 14 | Microscope seat | 1 | |
| 15 | Slipped Table | 1 | |
| 16 | Cone-shape Table | 1 | |
| 17 | Flashlight | 1 | |
| 18 | Fuse(0.5A) | 2 | |
| 19 | Lighting head | 1 | |
| 20 | Lighting shade | 1 | |
| 21 | Power cable | 1 | |
| 22 | Plastic dust cover | 1 | |
| 23 | Attached files | 1 | |
| 24 | Host accessories box | 1 | |
- 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.
- 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.
Address:
E506, Power Creative Building, No. 1 Shangdi East Road, Haidian District, Beijing, China
Business Type:
Manufacturer/Factory
Business Range:
Industrial Equipment & Components, Instruments & Meters, Tools & Hardware
Management System Certification:
ISO 9001
Company Introduction:
Mitech is a manufacturer specializes in Non-Destructive Testing (NDT) instruments. Located in Beijing, Mitech has a professional engineer team devoted in R&D and manufacturing advanced high technical instrument; Its main products are ultrasonic digital flaw detectors, portable metal hardness testers, handle ultrasonic thickness gauges, and coat thickness gauges etc.
Until now, Mitech has distributors dispersed in major cities of China and offers excellent after-sale service. Mitech′s instruments are widely used in domestic generating industry, petroleum and chemical industry, pressure vessel manufacturing industry and so on, for providing quality control procedure; Customers are satisfied with the high-quality, good reliability and its prompt after-sale services.
Mitech′s mission is to provide customers with the best products and services, make contributions to the development of our world, the company is active in communicating with our distributors and customers both present and potential, main conversions and exhibitions of non-destructive testing are good chances for people to know more about Mitech and its products. Mitech welcomes to join hands with more friends.
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