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

Mitech CO.,LTD.

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

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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Mitech MHRS-150-P Digital Plastic Rockwell Hardness Tester

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

Technical Parameters

Technical specifications Technical Parameters
Preliminary testing force 98.07N,tolerance±2.0%
Testing force 588.4N,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 mode Automatic operation (preliminary test needs manual operation)
Indenter specification Φ3.175mm steel ball indenter;Φ6.35mm steel ball indenter;Φ12.7mm steel ball indenter
Display LCD
Rockwell scale HRA,HRB,HRC,HRD,HRE,HRF,HRG,HRH,HRK
Conversion scale

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

HR15T,HR30T,HR45T,HV,HK,HBW

Duration time 1~30s(The testing force duration time for plastic Rockwell hardness test is 15 seconds)
Indication error 0.1HR
Maximum height of specimen 170mm
Distance of indenter to outer wall 165mm
Power supply AC220V/50Hz
Dimensions 550*220*730mm
Main unit weight 85kg

Indication Error

Scale Standard Hardness Range Allowed Maximum Tolerance
HRA 20-75HRA ±2HRA
75-88HRA ±1.5HRA
HRB 20-45HRB ±4HRB
45-80HRB ±3HRB
80-100HRB ±2HRB
HRC 20-70HRC ±1.5HRC
HRD 40-70HRD ±2HRD
70-77HRD ±1.5HRD
HRE 70-90HRE ±2.5HRE
90-100HRE ±2HRE
HRF 60-90HRF ±3HRF
90-100HRF ±2HRF
HRG 30-50HRG ±6HRG
50-75HRG ±4.5HRG
75-94HRG ±3HRG
HRH 80-100HRH ±2HRH
HRK 40-60HRK ±4HRK
60-80HRK ±3HRK
80-100HRK ±2HRK
HRL 100-120HRL ±1.2HRL
HRM 85-110HRM ±1.5HRM
HRR 114-125HRR ±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.
Durable Rockwell Testing Machine , Ultrasonic Hardness Tester MHRS-150-P

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.

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

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

Scale Indenter type preliminary testing force Testing force (N)

Measuring

range

Application
A

Diamond

cone

98.07(N) 588.4(N) 20-88HRA hard alloy, carbide, surface quenched steel, carburizing steel
D 980.7(N) 40-77HRD thin steel sheet, surface quenched steel
C 1471(N) 20-70HRC quenched steel, tempered steel, chilled cast iron
F

Φ1.5875

1/16 inch steel ball

588.4(N) 60-100HRF cast iron, aluminum, magnesium alloy, bearing alloy
B 980.7(N) 20-100HRB mild steel, copper alloy, annealed steel
G 1471(N) 30-94HRG phosphorus iron, beryllium bronze, malleable cast iron
H

Φ3.175

1/8inch steel ball

588.4(N) 80-100HRH aluminum, zinc, lead etc.
E 980.7(N) 70-100HRE bearing alloy, tin, hard plastics and other soft materials
K 1471(N) 40-100HRK
L

Φ6.35

1/4 inch steel ball

588.4(N) 50-115HRL Hard plastic ,hard rubber, aluminum, tin, bronze, mild steel, synthetic resin, friction materials and etc.
M 980.7(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 instructions NO. Name QTY. Remarks

Standard configuration

1 Main unit 1
2

Φ3.175mm

1/8inch steel ball indenter

1 Mainly 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
5 Counterweights 3
6 Small testing table 1 Diameter 60mm
7 Large testing table 1 Diameter 150mm
8 V-shape testing table 1 Test cylindrical specimens
9 Rockwell Standard Block 4 HRE,HRL,HRM,HRR
10 Fuse 0.5A 2
11 Spare LED bulbs 2
12 Thermal printing paper 1
13 Power cable 1
14 Plastic dust cover 1
15 Attached files 1
16 ABS instrument case 1

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


Product Tags:

hardness testing equipment

      

hardness measuring device

      
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