Mattel MH660 Digital Portable Hardness Tester
Product Description
product description
MH660 portable Leeb hardness tester is an upgraded product launched by Mattel, which pays more attention to user experience and functional innovation. Using 320×240 color LCD display, it can show you clear measurement results even in dim light and strong sunlight, which greatly improves the visual experience; the sealed metal shell is exquisitely designed, smaller in size and better in quality, and is designed to resist harshness Designed for oil and dust in the on-site environment; the original multi-point calibration function can adjust the conversion curve at multiple points to reduce the measurement error; the instrument can automatically identify the measurement direction during the measurement to meet the high-efficiency collection of multi-angle material hardness testing On demand, it supports free conversion between multiple hardness systems; the low-power design is powered by two AA batteries, which can realize Bluetooth communication and support multi-language version switching. It is widely used in the field of metal processing manufacturing, special equipment or sexual component in-service failure analysis, commodity inspection and other fields. It is especially suitable for on-site hardness testing of large non-removable parts. It is a professional precision instrument necessary to improve production qualification rate and save cost.
Functional purpose
Mold cavity.
Bearings and other parts.
Failure analysis of pressure vessels, steam turbine generator sets and their equipment.
Heavy workpieces.
Installed machinery or assembly parts.
The test space is very small and small.
A formal original record of the test results is required.
The material classification of the metal material warehouse.
Quick inspection of multiple measuring positions in a large range of large workpieces.
working principle
Under the action of elastic force, the impact body of specified quality is used to impact the surface of the sample at a certain speed. The hardness value is calculated by the ratio of the rebound speed of the punch at 1mm from the surface of the sample to the impact speed. The calculation formula is as
Down:
Calculation method: HL=1000×VB/ VA
In the formula: HL-Leeb hardness value
VB——Rebound speed of impact body
VA——impact velocity of impact body
Working conditions
Ambient temperature: operating temperature -10℃～＋50℃
Storage temperature: -30℃～＋60℃
Relative humidity: ≤90%
There is no strong vibration, no strong magnetic field, no corrosive medium and serious dust in the surrounding environment
Instrument characteristics
Based on the Leeb hardness measurement principle, hardness and strength testing can be performed on a variety of metal materials.
Adapt to six types of impact devices; automatically identify the type of impact device, no need to recalibrate when changing.
Automatically detect the status of the impact device (connection, disconnection, failure, etc.).
Automatically recognize the direction of impact (except G-type impact device), 360° free measurement in all directions.
320×240 TFT true color LCD screen, rich in information, intuitive, clear display, adjustable brightness, convenient to use in dim light and strong sunlight.
Basic (single-point) calibration and original multi-point calibration function can perform multi-point adjustment on the conversion curve to reduce measurement errors.
The measurement results can be converted to Richter (HL), Brinell (HB), Rockwell B (HRB), Rockwell C (HRC), Rockwell A (HRA), Vickers (HV), Shore (HS).
The built-in Richter hardness conversion function can realize the mutual conversion between HLD value and HLC, HLG, HLDL, HLD+15, which is convenient for instrument calibration and measured value conversion.
The upper and lower limits of the hardness value can be preset, and the alarm will be automatically alarmed when the range is exceeded, which is convenient for the needs of users for batch testing.
Free switching between Chinese and English, menu-based operation, simple and convenient to use.
It can store 500 sets of hardness measurement data (number of impacts 32～1), each set of data includes single measurement value, average value, measurement date/time, impact direction, number of times, material, hardness scale and other information.
Powered by two ordinary AA batteries, it can work continuously for no less than 100 hours; it has power saving functions such as automatic screen standby, automatic sleep, and automatic shutdown.
USB1.1 interface can communicate with PC conveniently and quickly.
Built-in bluetooth module, can connect to bluetooth printer through bluetooth interface to realize wireless printing.
Equipped with PC-side data processing software, it has rich functions such as transmission of measurement results, storage management, statistical analysis, and generation of measurement reports.
Designed specifically for harsh on-site environments, it is sturdy and durable, and its unique sealing design enables it to resist humidity, wind, sand, and dust in various harsh environments from the ocean to the desert.
Oil pollution and other pollution.
Dimensions: 120mm×67mm×31mm
Operation method and matters needing attention
The calibrated Leeb hardness block can be used to test the instrument before the measurement, and the error and repeatability of the indication should not be greater than that specified in Table 1-1.
If the indication error and repeatability exceed the regulations in Table 1-1, the instrument should be calibrated (using the basic calibration function, if necessary, multi-point calibration can be performed) before use;
If there are still large indication errors and repeatability errors after calibration, please read Chapter 6 (Fault Analysis and Elimination) of this manual, or contact the manufacturer for technology
Support or repair.
1. Load
Push down the loading sleeve to lock the impact body (for DC type impact device, you can suck the loading rod on the surface of the sample, insert the DC type impact device into the loading rod until it stops
Position), the loading of the impact device is now completed.
2. Positioning
Press the support ring of the impact device on the surface of the sample according to the selected measurement direction, and the impact direction should be perpendicular to the test surface.
3. Measurement
Press the release button on the upper part of the impact device to measure. During the measurement process, the sample, impact device, and operator are required to be stable, and the direction of the force should pass through the impact
Strike the axis of the device. Each part of the sample that needs to be measured is generally measured 3 to 5 times. The data dispersion should not exceed ±15HL of the average. Distance between any two indentations
Or the distance between the center of any indentation and the edge of the sample should meet the requirements of Table 4-1.
Table 4-1
Impact device type Distance between two indentation centers Distance between indentation center and sample edge
Not less than (mm) not less than (mm)
D, DC 3 5
DL 3 5
D+15 3 5
G 4 8
C 2 4
4. Read the measured value
Use the measured average value of multiple effective test points as a Leeb hardness measurement data. When recording the Leeb hardness measurement result, the hardness is displayed before the Leeb hardness symbol HL
The degree value shows the impact device type after HL. For example, 780HLD indicates that the Leeb hardness value measured by the D-type impact device is 780.
For other hardness converted by Leeb hardness, the corresponding hardness symbol should be attached before the Leeb hardness symbol. For example, 420HVHLD means to measure with D-type impact device
The Vickers hardness value converted from Leeb hardness is 420.
Note: HL values measured by different impact device types are different, for example, 780HLD≠780HLC. This instrument has a built-in conversion table between the HL values measured by different impact devices,
Please refer to 5.6 for the usage method.
Precautions:
The surface temperature of the workpiece should not be overheated and should be less than 120°C.
The surface roughness of the workpiece should not be too large, otherwise it will cause measurement errors. The measured surface of the workpiece must show metallic luster, and be flat, smooth, and free of oil stains.
Specimens with overhangs or thin-walled specimens weighing 2-5kg should be supported by objects during the test to avoid deformation, buckling and movement of the specimen due to impact force;
The measurement of the shaped workpiece must be placed on a flat and firm surface.
It must be placed steadily without any shaking;
Only heavy specimens weighing more than 5kg can be directly measured without support. The portable Leeb hardness tester has strict requirements on the thickness of the measured workpiece, and the minimum thickness of the workpiece is
The degree should meet the specification requirements of the manual.
For workpieces with a hardened surface layer, the depth of the hardened layer should conform to the specification.
For lighter workpieces, it must be tightly coupled with a solid support, the two coupling surfaces must be flat and smooth, the amount of coupling agent should not be too much, and the test direction must be vertical.
Straight to the coupling plane; when the workpiece is a large-area plate, long rod, or bent part, even if the weight and thickness are large, it may cause deformation and instability of the test piece, resulting in inconsistent test values.
Therefore, it should be reinforced on the back of the test point or the magnetic property of the supporting workpiece should be less than 30 Gauss curved surface workpiece: the test surface of the workpiece is flat.
When the measured surface curvature radius R is less than 30mm, a small support ring or a special-shaped support ring should be used in the test.
Store away from vibration, strong magnetic field, corrosive media, humidity, dust, and store at room temperature.
The transportation can be carried out under the condition of the third-level highway under the condition of guaranteeing the original packaging.
Instrument care and maintenance
Impact device maintenance
After using the impact device for 1000 to 2000 times, clean the tube and impact body of the impact device with a nylon brush. When cleaning the catheter, first unscrew the support ring, and then remove the impact body
Screw the nylon brush into the tube in a counterclockwise direction, pull it out at the bottom, repeat this 5 times, and then install the impact body and the support ring;
After use, the impact body should be released;
It is strictly forbidden to use various lubricants in the impact device.
Instrument maintenance procedures
When the standard Rockwell hardness block is used for verification, and the errors are greater than 2HRC, it may be that the ball head wears and fails, and the ball head or impact body should be considered to be replaced.
When there are other abnormal phenomena of the hardness tester, please do not disassemble or adjust any fixed assembly parts. After filling in the warranty card, send it to the maintenance department of our company.
Door, implement the warranty regulations.
Impact device type | Distance between two indentation centers | Distance between indentation center and sample edge |
not less than（mm） | not less than(mm) | |
D、DC | 3 | 5 |
DL | 3 | 5 |
D+15 | 3 | 5 |
G | 4 | 8 |
C | 2 | 4 |
4. Read the measured value
Use the measured average value of multiple effective test points as a Leeb hardness measurement data. When recording the Leeb hardness measurement result, the hardness is displayed before the Leeb hardness symbol HL
The degree value shows the impact device type after HL. For example, 780HLD indicates that the Leeb hardness value measured by the D-type impact device is 780.
For other hardness converted by Leeb hardness, the corresponding hardness symbol should be attached before the Leeb hardness symbol. For example, 420HVHLD means to measure with D-type impact device
The Vickers hardness value converted from Leeb hardness is 420.
Note: HL values measured by different impact device types are different, for example, 780HLD≠780HLC. This instrument has a built-in conversion table between the HL values measured by different impact devices,
Please refer to 5.6 for the usage method.
Precautions:
The surface temperature of the workpiece should not be overheated and should be less than 120°C.
The surface roughness of the workpiece should not be too large, otherwise it will cause measurement errors. The measured surface of the workpiece must show metallic luster, and be flat, smooth, and free of oil stains.
Specimens with overhangs or thin-walled specimens weighing 2-5kg should be supported by objects during the test to avoid deformation, buckling and movement of the specimen due to impact force;
The measurement of the shaped workpiece must be placed on a flat and firm surface.
It must be placed steadily without any shaking;
Only heavy specimens weighing more than 5kg can be directly measured without support. The portable Leeb hardness tester has strict requirements on the thickness of the measured workpiece, and the minimum thickness of the workpiece is
The degree should meet the specification requirements of the manual.
For workpieces with a hardened surface layer, the depth of the hardened layer should conform to the specification.
For lighter workpieces, it must be tightly coupled with a solid support, the two coupling surfaces must be flat and smooth, the amount of coupling agent should not be too much, and the test direction must be vertical.
Straight to the coupling plane; when the workpiece is a large-area plate, long rod, or bent part, even if the weight and thickness are large, it may cause deformation and instability of the test piece, resulting in inconsistent test values.
Therefore, it should be reinforced on the back of the test point or the magnetic property of the supporting workpiece should be less than 30 Gauss curved surface workpiece: the test surface of the workpiece is flat.
When the measured surface curvature radius R is less than 30mm, a small support ring or a special-shaped support ring should be used in the test.
Store away from vibration, strong magnetic field, corrosive media, humidity, dust, and store at room temperature.
The transportation can be carried out under the condition of the third-level highway under the condition of guaranteeing the original packaging.
Instrument care and maintenance
Impact device maintenance
After using the impact device for 1000 to 2000 times, clean the tube and impact body of the impact device with a nylon brush. When cleaning the catheter, first unscrew the support ring, and then remove the impact body
Screw the nylon brush into the tube in a counterclockwise direction, pull it out at the bottom, repeat this 5 times, and then install the impact body and the support ring;
After use, the impact body should be released;
It is strictly forbidden to use various lubricants in the impact device.
Instrument maintenance procedures
When the standard Rockwell hardness block is used for verification, and the errors are greater than 2HRC, it may be that the ball head wears and fails, and the ball head or impact body should be considered to be replaced.
When there are other abnormal phenomena of the hardness tester, please do not disassemble or adjust any fixed assembly parts. After filling in the warranty card, send it to the maintenance department of our company.
Door, implement the warranty regulations.
