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Durable Rockwell Testing Machine , Ultrasonic Hardness Tester MHRS-150-P

Categories Digital Hardness Tester
Brand Name: Mitech
Model Number: MHRS-150-P
Certification: GB,JJG,ASTM...
Place of Origin: Beijing China
MOQ: 1 piece
Payment Terms: T/T, Western Union,PayPal
Supply Ability: 50units per month
Delivery Time: 5-8 work days
Packaging Details: Wooden box
Preliminary testing force: 98.07N,tolerance±2.0%
Testing force: 588.4N,980.7N,1471N,tolerance±1.0%
Testing force application mode: Automatic operation (preliminary test needs manual operation)
Display: LCD
Indication error: 0.1HR
Maximum height of specimen: 170mm
Power supply: AC220V/50Hz
Dimensions: 550*220*730mm
Main unit weight: 85kg
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    Durable Rockwell Testing Machine , Ultrasonic Hardness Tester MHRS-150-P

    Mitech MHRS-150-P Digital Plastic Rockwell Hardness Tester

    Technical Parameters

    Technical specificationsTechnical Parameters
    Preliminary testing force98.07N,tolerance±2.0%
    Testing force588.4N,980.7N,1471N,tolerance±1.0%
    Measuring range

    HRA:20-88,HRB:20-100,HRC:20-70,HRD:40-77,

    HRE:70-100,HRF:60-100,HRG:30-94,HRH:80-100,

    HRK:40-100,HRL:50-115,HRM:50-115,HRR:50-115

    Testing force application modeAutomatic operation (preliminary test needs manual operation)
    Indenter specificationΦ3.175mm steel ball indenter;Φ6.35mm steel ball indenter;Φ12.7mm steel ball indenter
    DisplayLCD
    Rockwell scaleHRA,HRB,HRC,HRD,HRE,HRF,HRG,HRH,HRK
    Conversion scale

    HRA,HRB,HRC,HRD,HR15N,HR30N,HR45N,

    HR15T,HR30T,HR45T,HV,HK,HBW

    Duration time1~30s(The testing force duration time for plastic Rockwell hardness test is 15 seconds)
    Indication error0.1HR
    Maximum height of specimen170mm
    Distance of indenter to outer wall165mm
    Power supplyAC220V/50Hz
    Dimensions550*220*730mm
    Main unit weight85kg

    Indication Error

    ScaleStandard Hardness RangeAllowed Maximum Tolerance
    HRA20-75HRA±2HRA
    75-88HRA±1.5HRA
    HRB20-45HRB±4HRB
    45-80HRB±3HRB
    80-100HRB±2HRB
    HRC20-70HRC±1.5HRC
    HRD40-70HRD±2HRD
    70-77HRD±1.5HRD
    HRE70-90HRE±2.5HRE
    90-100HRE±2HRE
    HRF60-90HRF±3HRF
    90-100HRF±2HRF
    HRG30-50HRG±6HRG
    50-75HRG±4.5HRG
    75-94HRG±3HRG
    HRH80-100HRH±2HRH
    HRK40-60HRK±4HRK
    60-80HRK±3HRK
    80-100HRK±2HRK
    HRL100-120HRL±1.2HRL
    HRM85-110HRM±1.5HRM
    HRR114-125HRR±1.2HRR

    Working Principle

    The Rockwell hardness test is taking the diamond cone with 120°apex angle or the hardened steel ball with specified diameter as the indenter to press into sample surface with specific test force, then get the Rockwell hardness of the measured metallic materials according to the sample surface indentation depth.

    The Rockwell hardness measurement principle is shown as below figure. 0-0 is the position that the diamond indenter is not yet in contact with the sample. 1-1 figure is the indenter position under the affect of the preliminary test force, the indentation depth is h1. The preliminary test is to eliminate the influence to the testing result accuracy caused by the roughness of the sample surface. 2-2 in the figure is the indenter position under the influence of the testing force (the preliminary test force and the main test force). The depth is h2. 3-3 in the figure is the indenter position after dismounting the main test force. As the metal elasticity will recovery some degree after deformation, the really indentation depth of the indenter is h3. The plastic deformation caused by the main test force make the indenter pressing into the depth is h=h3-h1. Rockwell hardness value is determined by the size of h, the greater the depth h, the lower the hardness, otherwise, the higher the hardness.

    In the traditional concept, usually use a constant C minus h to represent the level of hardness, while the depth of indentation per 0.002mm as a unit of hardness. The hardness value obtained is called the Rockwell hardness value, denoted by the symbol HR.


    In the formula, c is a constant (for HRC, HRA, c is 0.2; for HRB, c is 0.26). The Rockwell hardness value HR obtained is an unknown number which is usually read directly on the test machine indicator when testing.

    Rockwell hardness tester working principle Figure


    It should be noted that the measured hardness values would be different with different indenter and test force. Therefore, the Rockwell hardness testing specifies 15 different hardness test scales according to the different indenter specification and test force sizes. And the HRB, HRC, HRA are the most widely used.

    Features

    • Widely used for high-precision hardness testing for plastic, hard rubber, synthetic resin, friction material and softer metal;
    • Adopt electronic automatic operation system to control the testing force, easy to operate;
    • Option for various specifications of the indenter, support many types of Rockwell hardness scales testing ;
    • Equipped with high-speed thermal printer, quickly print out the test data;
    • Support the conversion among various hardness scales such as Brinell, Vickers and etc;
    • Adopt large-screen LCD, easy to operate, visually display the test results;
    • Equipped with excellent performance of the carbide indenter, high hardness, wear resistance, good toughness, meanwhile with high temperature and corrosion resistance to ensure that the instrument test value is accurate, stable and reliable;
    • With the function of threshold overrun automatic alarm, apply to the bulk of finished products or semi-finished pieces of paper-by-piece detection;
    • The function of original ambient temperature real-time display can avoid the instrument working in the case of high or low temperature for a long time , resulting in increased test error and reducing the service life;
    • Consistent with GB7407,JJG884,ASTMD785,GB/T 3398.2 other relevant standards at home and abroad.

    The Scope of Application

    ScaleIndenter typepreliminary testing forceTesting force (N)

    Measuring

    range

    Application
    A

    Diamond

    cone

    98.07(N)588.4(N)20-88HRAhard alloy, carbide, surface quenched steel, carburizing steel
    D980.7(N)40-77HRDthin steel sheet, surface quenched steel
    C1471(N)20-70HRCquenched steel, tempered steel, chilled cast iron
    F

    Φ1.5875

    1/16 inch steel ball


    588.4(N)60-100HRFcast iron, aluminum, magnesium alloy, bearing alloy
    B980.7(N)20-100HRBmild steel, copper alloy, annealed steel
    G1471(N)30-94HRGphosphorus iron, beryllium bronze, malleable cast iron
    H

    Φ3.175

    1/8inch steel ball


    588.4(N)80-100HRHaluminum, zinc, lead etc.
    E980.7(N)70-100HREbearing alloy, tin, hard plastics and other soft materials
    K1471(N)40-100HRK
    L

    Φ6.35

    1/4 inch steel ball

    588.4(N)50-115HRLHard plastic ,hard rubber, aluminum, tin, bronze, mild steel, synthetic resin, friction materials and etc.
    M980.7(N)50-115HRL
    R

    Φ12.7

    1/2 inch steel ball

    588.4(N)50-115HRL

    Applications

    • Used for quality control in plastic products;
    • Used for resin rubber finished product testing
    • Demonstration experiment for education and teaching in Colleges and Universities;
    • Hardness testing of materials in scientific research institutions

    Working Conditions

    • Operation Temperature:10~30℃;
    • Relative Humidity:≤65%;
    • The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium and heavy dust.

    Configurations

    Configuration instructionsNO.NameQTY.Remarks

    Standard configuration

    1Main unit1
    2

    Φ3.175mm

    1/8inch steel ball indenter

    1Mainly used for measuring hard plastic and other non-metallic materials Rockwell hardness.
    3

    Φ6.35mm

    1/4inch steel ball indenter

    1
    4

    Φ12.7mm

    1/2inch steel ball indenter

    1
    5Counterweights3
    6Small testing table1Diameter 60mm
    7Large testing table1Diameter 150mm
    8V-shape testing table1Test cylindrical specimens
    9Rockwell Standard Block4HRE,HRL,HRM,HRR
    10Fuse 0.5A2
    11Spare LED bulbs2
    12Thermal printing paper1
    13Power cable1
    14Plastic dust cover1
    15Attached files1
    16ABS instrument case1

    Maintenance and Precautions

    • The test personnel should follow the operating procedures.Before and after the test,it should be repeated with standard block calibration equipment;
    • If the specimen has visible deformation marks on the back and edges, the test result would be useless. It should choose the intender or test force to test again;
    • Normally, the first point is only used to offset the gap of each support surface without needing to record the test result. Record the statistical test result from the second point;
    • During testing, to ensure accuracy, please make sure the distance between the adjacent indentation center and the distance from the indentation center to edge of the specimen is greater than 3mm;
    • Pay attention to palm the instrument for carrying to forbid falling across. Please fix well the measuring lever, counterweight and boom before carrying;
    • 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;
    • Turn off the power after using the instrument;
    • 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;
    • Long time after the re-enabled,it should be preheated the electrical components before test
    • The hardness tester should be calibrated at least once a year to ensure its accuracy;
    • Don’t disassemble the instrument without authorization, for maintenance related matters, please contact MITECH after-sale service department with 4000600280.

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