MA-412MM Magnetic metal analyzer/coercive force meter

MA-412MM magnetic metal analyzer made by NPP Mashproject LLC is developed for a non-destructive quality control of bulk heat treatment, surface hardening, and stressed state of parts and metal structures made of ferromagnetic materials.

MA-412MM magnetic metal analyzer (coercive force meter) can be used both in laboratory and workshop conditions.

The working principle of the magnetic analyzer is based on the analysis of the interaction of alternating magnetic field with a controlled part.

The QMS of Mashproject LLC complies with the requirements of GOST R ISO 001-2015 (ISO 9001:2015).

Application:

– quality control of heat treatment, thermomechanical and chemical heat treatment;
– local control of surface layers of ferromagnetic materials;
– measurement of bulk hardness, mechanical properties and structure of products;
– identification of a stressed state;
– sorting and determining the material grade.

Advantages:

• High accuracy and stability of instrument readings due to low-frequency magnetization and demagnetization of the controlled product.
• Automatic conversion of measured magnetic characteristics into the controlled parameter value (for example, into thickness in millimeters).
• Compact, impact-resistant housing with a handle that can be fixed in different positions and used as a stand.
• Possibility of equipping with probes of various sizes and configurations.
• Shape of the replaceable electromagnet pole tips can be customized.

Controlled objects:

• Crankshafts, gears, rolling mills, pipes.
• Parts of machines and mechanisms.
• Bridge structures.
• Elements of the chassis of tracked vehicles.

MA-412MM coercive force meter has a shock-resistant housing of compact dimensions. The special stand can be fixed in different positions for easy reading or used as a handle for carrying the device.

MA-412MM magnetic metal analyzer (coercive force meter) can be used in field, workshop or laboratory conditions. An important advantage of the instrument is the ability to use it for sorting products by steel grade.

The operating principle of the device is based on the analysis of the interaction of alternating magnetic field with a controlled part. The magnetic characteristics depend on multiple physical-chemical and structural properties such as hardness, yield strength, tensile strength, tempering temperature, chemical composition, steel or cast-iron grade, hardness of hardened layer, impact strength, deformation state etc. In case all the parameters are approximately constant (typically within the same product) the magnetic analyzer allows to reveal the anomalies associated with the condition of the material.

When the correlation between the coercive force and the parameter of interest has been established, it may be recorded into the device memory as a relationship between the magnetic characteristic and the controlled parameter in a “SCALE SET UP” operation mode. The readings will be displayed in the required units, e.g., in units of hardness when measuring the heat treatment quality or in millimeters when measuring the hardened layer thickness.

In order to study the above-mentioned correlation and record it to the device memory it is necessary to manufacture control samples (CS) of coercive force depending on the relationship type between the measured and output parameters.

Requirements to control samples

In order to set up the device the CS must possess only one changeable parameter, depending on the selected magnetic characteristic, and the remaining parameters must be unchanged. The manufacturing technology and certification procedure of CS are developed in relation to each specific case.

The CS are made directly from the investigated part. It is necessary to analyze the chemical composition of material and, if possible, pick out specimens with average values of impurities content affecting the selected magnetic characteristic.

It is possible that the CS will have to be replaced over time due to changes in impurity content in the material which may have an influence on the selected magnetic characteristic.

It is required from 2 to 10 pcs of CS for control of one parameter of one product made of the same material grade. The first and the last CS should correspond to the minimal and maximal values of the controlled parameter, correspondingly, and the intermediate CSs should be evenly distributed over the range between min and max values of the controlled parameter.

The length of the controlled part must me not less than 70 mm. If the controlled item surface is not flat, it is necessary to use additional pole tips of the electromagnet to ensure the reliable magnetic connection between the electromagnet and the controlled area.

Basic delivery set: