SANDOMIRSKI Sergey Grigoryevich,
Head of the Laboratory of Metallurgy in Mechanical Engineering,
D.Sc. in Eng., Associate Professor
Directions of activities
- DEVELOPMENT OF CHEMICAL AND THERMAL HARDENING TECHNOLOGIES IN RELATION TO SPECIFIC EQUIPMENT THAT ENSURE THE REQUIRED QUALITY OF POWER TRANSMISSION PARTS FOR AUTOMOTIVE MACHINERY
Methods of material quality control (patents No. 14748, 15273) make it possible to identify defects in the microstructural state that are not detected by generally accepted methods in mechanical engineering, but have a significant impact on the performance of products.
The technology corresponds to the best world analogues (Caterpillar, Mercedes-Benz, Volvo, Komatsu, Unit Rig, General Electric, etc.).
Work on the development of advanced thermochemical treatment (TCT) technologies was carried out at the Minsk Wheel Tractor Plant, the Belarusian Automobile Plant, and the Minsk Tractor Plant.
The research results make it possible to reduce energy and material costs by up to 30 % through the use of sparingly alloyed steels, and to increase the durability of components by 1.2–1.5 times due to an increase in the endurance limits of the material and the quality of hardening.
The software package for designing the technological TCT processes of transmission gears includes:
-
a software package for calculating and predicting at the design stage the reliability indicators of transmission gears, taking into account the operating conditions and design of the transmission, the geometric parameters of the gear, the grade of steel, manufacturing technology and quality of thermochemical treatment, as well as databases on the effect of the quality of the structure of reinforced layers and the features of the thermal equipment used on the characteristics of bending and contact fatigue of the gears. The output data at this stage are the design parameters of the gear train and the technical requirements for the grade of steel, the distribution of microhardness over the thickness of the hardened layer (effective thickness) and the quality of the microstructure, ensuring a given durability;
-
a software package for calculating TCT modes, consisting of a program for calculating the hardenability of steel and a program for calculating the process of carbon diffusion into steel, depending on the steel grade, carburization and quenching parameters. The output data of the calculation are the concentration of the carbon potential and the temperature-time intervals of each stage of the TCT process.
The use of the TCT process control software package makes it possible, at the design stage, to ensure the required level of reliability, not only to select the design parameters of gears, but also, depending on the level of load and the required durability, to assign a steel grade, technical requirements for the effective thickness and quality of the microstructure of reinforced layers, to develop technological TCT modes for each specific the type of transmission. Moreover, when the heat treatment conditions change and the nomenclature of components changes, it becomes possible to quickly reconfigure the technological process, which increases the productivity of TCT production processes.
- MAGNETIC STRUCTUROSCOPY OF IRON-CARBON ALLOYS
|
The research is aimed at analyzing the relationship between the structural and phase composition, physical and mechanical properties of steels and cast iron with their magnetic parameters. The established features and patterns made it possible to develop new high-performance methods for non-destructive quality control of the structure of steel and cast iron products, including those moving during production.
Results:
The research results and technical solutions to ensure the specified structure of non-turned ductile iron nipple castings were transferred to the Minsk Heating Equipment Plant under license agreements and implemented in the malleable and gray cast iron workshop of the plant as part of an automated control line and automatic disassembly of malleable cast iron nipple castings KCh30-6.
The operation of the line increased the profitability of nipple production, met the needs of the plant, made it possible to abandon the replacement of cast iron nipples with imported steel ones, and ensure their export supplies.
|
|
The result of the work was an improved technique for monitoring the mechanical properties of heat-treated bolts of diesel engines. The method of electromagnetic control of the mechanical properties of a moving ferromagnetic product was transferred under a license agreement to a branch of the Minsk Motor Plant in Stolbtsy and put into production. The application of the method implemented by the developed MAKSI-U device guarantees a given strength limit of bolts, increases the reliability of all diesel engines produced by the Minsk Motor Plant. Its use also brings direct economic benefits to the plant – thousands of expensive bolts have been returned to production. |
|
The application of the methods prevented critical axles with a low level of mechanical properties from entering the assembly line of the Minsk Motor Plant, and increased the reliability of all diesel engines produced by the plant. The implementation of the results and research makes it possible to guarantee a given level of physical and mechanical properties of critical products in mechanical engineering and metallurgy. |
|
- RESEARCH AND DEVELOPMENT OF THE TECHNOLOGICAL FOUNDATIONS OF RING ROLLING OF RING TYPE PARTS
|
The total number of ring-shaped parts produced at Belarusian enterprises (MBP, MTW, MAZ, BELAZ, MWTP, etc.) is more than 100 items with a production program of about 160,000 units. The metal utilization factor is about 0.6. About 4,000 tons of chips are formed. Domestic plants have no experience in using ring-rolling complexes, however, the issue of purchasing such complexes is being worked out by MBP and BELAZ. It is assumed that the new technology will increase the metal utilization rate to 0.8. The research carried out at the Institute is aimed at scientific support of the introduction of new equipment. |
|
Products
- Magnetic sorter
- Automated control and automatic disassembly line for the machinability of non-sharpened ductile iron nipple castings based on MAKSI-P devices
- Magnetic analyzers of the quality of the structure of MAKSI products
- Resource-saving technology of chemical and thermal treatment of new sparingly alloyed steels for gears of transmission of tractor “Belarus”
Contacts
| SANDOMIRSKI Sergey Grigoryevich, Head of the Laboratory of Metallurgy in Mechanical Engineering, D.Sc. in Eng., Associate Professor |
| tel.: +375 (17) 378 94 82; +375 (17) 284 23 51 |
| e-mail: |
