Π¦Π΅Π½Ρ‚Ρ€Π°Π»ΡŒΠ½ΠΎΡƒΠΊΡ€Π°Ρ—Π½ΡΡŒΠΊΠΈΠΉ Π½Π°ΡƒΠΊΠΎΠ²ΠΈΠΉ вісник. Π’Π΅Ρ…Π½Ρ–Ρ‡Π½Ρ– Π½Π°ΡƒΠΊΠΈ. Випуск 3. - 2020

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    Автоматизація ΠΏΠΎΡ€Ρ†Ρ–ΠΉΠ½ΠΎΡ— Ρ€ΠΎΠ·Π»ΠΈΠ²ΠΊΠΈ Ρ€ΠΎΠ·ΠΏΠ»Π°Π²Ρƒ Ρ‡Π°Π²ΡƒΠ½Ρƒ Π² ΠΊΠΎΠΊΡ–Π»ΡŒ ΠΏΡ€ΠΈ Π²ΠΈΡ€ΠΎΠ±Π½ΠΈΡ†Ρ‚Π²Ρ– Π²ΠΈΠ»ΠΈΠ²ΠΊΡ–Π² Π΄Π΅Ρ‚Π°Π»Π΅ΠΉ машин Π³Ρ–Ρ€Π½ΠΈΡ‡ΠΎΡ€ΡƒΠ΄Π½ΠΎΡ— промисловості
    (ЦНВУ, 2020) Π›ΠΎΠΌΠ°ΠΊΡ–Π½, Π’. М.; ΠŸΡƒΠΊΠ°Π»ΠΎΠ², Π’. Π’.; Π”ΡƒΠ±ΠΎΠ΄Ρ”Π»ΠΎΠ², Π’. Π†.; Π“ΠΎΡ€ΡŽΠΊ, М. Π‘.; Lomakin, V.; Pukalov, V.; Dubodelov, V.; Goryuk, M.; Π›ΠΎΠΌΠ°ΠΊΠΈΠ½, Π’. Н.; Π”ΡƒΠ±ΠΎΠ΄Π΅Π»ΠΎΠ², Π’. И.
    Π’ΠΈΠΊΠΎΠ½Π°Π½ΠΎ Π°Π½Π°Π»Ρ–Π· основних ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€Ρ–Π² дозування Ρ€ΠΎΠ·ΠΏΠ»Π°Π²Ρƒ Ρ‡Π°Π²ΡƒΠ½Ρƒ Π² ΠΌΠ΅Ρ‚Π°Π»Π΅Π²Ρ– Ρ„ΠΎΡ€ΠΌΠΈ Π·Π° допомогою ΠΌΠ°Π³Π½Ρ–Ρ‚ΠΎΠ΄ΠΈΠ½Π°ΠΌΡ–Ρ‡Π½ΠΎΡ— установки ΠœΠ”Π-6Π§. Π ΠΎΠ·Ρ€ΠΎΠ±Π»Π΅Π½ΠΎ ΠΏΡ€ΠΈΠ½Ρ†ΠΈΠΏΠΎΠ²Ρƒ схСму управління Π΅Π»Π΅ΠΊΡ‚Ρ€ΠΎΠΌΠ°Π³Π½Ρ–Ρ‚Π½ΠΈΠΌΠΈ систСмами Π°Π³Ρ€Π΅Π³Π°Ρ‚Ρƒ. Π’Ρ–Π΄ΠΏΡ€Π°Ρ†ΡŒΠΎΠ²Π°Π½ΠΎ Ρ‚Π΅Ρ…Π½ΠΎΠ»ΠΎΠ³Ρ–ΡŽ дозування Ρ– Π·Π°Π»ΠΈΠ²ΠΊΠΈ ΠΌΠ΅Ρ‚Π°Π»Ρƒ Π² ΠΊΠΎΠΊΡ–Π»ΡŒ ΠΏΡ€ΠΈ Π²ΠΈΠ³ΠΎΡ‚ΠΎΠ²Π»Π΅Π½Π½Ρ– Ρ‡Π°Π²ΡƒΠ½Π½ΠΈΡ… ΠΊΡƒΠ»ΡŒ Π΄Ρ–Π°ΠΌΠ΅Ρ‚Ρ€ΠΎΠΌ 40 Ρ– 120 ΠΌΠΌ. The analysis of the basic parameters of the dosage of molten iron in metal forms using the magnetodynamic installation MDN-6CH. A schematic diagram has been developed for controlling the electromagnetic systems of the unit. The technology of dosing and pouring metal into the chill mold has been developed in the manufacture of cast iron balls with a diameter of 40 and 120 mm. At the optimal casting temperature, the electrical parameters of the inductor (voltage Ui, current Ii, power Ri) were in the range Ui = 250-300 V, Ii = 480-520 A, Ri = 140-160 kW. When reducing the mass of metal in the crucible MDN-6CH using a control scheme made switching inductor from a voltage of 300 V to 250 V. The power was reduced by 15-20 kW, and the temperature of the metal remained within the tolerance of the technology of metal casting. Using the adopted dosing scheme, it became possible to cast metal at constant parameters of the electromagnetic system and the time of pouring. The technology of dispensing and pouring metal into the mold for the production of cast iron balls with a diameter of 40 and 120 mm was carried out at an inductor voltage of 300 V, and the electromagnet - 220 V. The initial level of metal on the drain socket was equal to 20 mm. The molding time of molds in the manufacture of balls with a diameter of 40 mm was 7.3 s, and balls with a diameter of 120 mm - 16.2 s. The operating time of the electromechanical actuator was set in the manufacture of balls with a diameter of 40 mm - 0.35 s, and balls with a diameter of 120 mm - 0.75s. The consumption of metal in the manufacture of balls with a diameter of 40 and 120 mm was in the range of 0.7-0.75 kg / s and 1.65-1.70 kg / s, respectively. The metal casting was carried out at temperatures of 1320-1340 Β° C and 1360-1380 Β° C. The dosage accuracy was determined by weighing the metal of the poured balls and the molding system of the mold. Mathematical processing of the results of the dosing showed that in the manufacture of balls with a diameter of 40 mm at a temperature of 1320 Β°C the error of dosing is 10-11%. With increasing iron temperature, the dosage error decreases and at a metal temperature of 1370 Β°C is 5-6%. In the manufacture of balls with a diameter of 120 mm at a temperature of iron 1330, the dosage error is 7-8%, and at a temperature of 1360 Β° C - 3-4%. The study of the characteristics of the casting and dosing process of cast iron in the chill mold allowed us to develop the technology of casting cast iron melts, which provided the required metering accuracy and high productivity of the conveyor production of grinding bodies. ΠŸΡ€ΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· основных ΠΏΠ°Ρ€Π°ΠΌΠ΅Ρ‚Ρ€ΠΎΠ² дозирования расплава Ρ‡ΡƒΠ³ΡƒΠ½Π° Π² мСталличСскиС Ρ„ΠΎΡ€ΠΌΡ‹ с ΠΏΠΎΠΌΠΎΡ‰ΡŒΡŽ магнитодинамичСской установки ΠœΠ”Π-6Π§. Π Π°Π·Ρ€Π°Π±ΠΎΡ‚Π°Π½Π° ΠΏΡ€ΠΈΠ½Ρ†ΠΈΠΏΠΈΠ°Π»ΡŒΠ½Π°Ρ схСма управлСння элСктромагнитными систСмами Π°Π³Ρ€Π΅Π³Π°Ρ‚Π°. ΠžΡ‚Ρ€Π°Π±ΠΎΡ‚Π°Π½Π° тСхнология дозирования ΠΈ Π·Π°Π»ΠΈΠ²ΠΊΠΈ ΠΌΠ΅Ρ‚Π°Π»Π»Π° Π² кокиль ΠΏΡ€ΠΈ ΠΈΠ·Π³ΠΎΡ‚ΠΎΠ²Π»Π΅Π½ΠΈΠΈ Ρ‡ΡƒΠ³ΡƒΠ½Π½Ρ‹Ρ… ΡˆΠ°Ρ€ΠΎΠ² Π΄ΠΈΠ°ΠΌΠ΅Ρ‚Ρ€ΠΎΠΌ 40 ΠΈ 120 ΠΌΠΌ.
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    Ударостійкий Ρ‡Π°Π²ΡƒΠ½ для ΠΌΠΎΠ»ΠΎΠ»ΡŒΠ½ΠΈΡ… Ρ‚Ρ–Π»
    (ЦНВУ, 2020) Π›ΠΎΠΌΠ°ΠΊΡ–Π½, Π’. М.; ΠœΠΎΠ»ΠΎΠΊΠΎΡΡ‚, Π›. А.; Lomakin, V.; Molokost, L.; Π›ΠΎΠΌΠ°ΠΊΠΈΠ½, Π’. Н.
    ΠŸΡ€ΠΎΠ²Π΅Π΄Π΅Π½ΠΎ дослідТСння Π΄ΠΈΠ½Π°ΠΌΡ–Ρ‡Π½ΠΎΡ— міцності (ударостійкості) ΠΌΠΎΠ»ΠΎΠ»ΡŒΠ½ΠΈΡ… Ρ‚Ρ–Π», Π²Ρ–Π΄Π»ΠΈΡ‚ΠΈΡ… Π· Π½ΠΈΠ·ΡŒΠΊΠΎΡ…Ρ€ΠΎΠΌΠΈΡΡ‚ΠΎΠ³ΠΎ Ρ‡Π°Π²ΡƒΠ½Ρƒ Π² багатомісному ΠΊΠΎΠΊΡ–Π»Ρ–, Π² залСТності Π²Ρ–Π΄ вмісту Ρ…Ρ€ΠΎΠΌΡƒ Π² сплаві. ВстановлСно підвищСння ударостійкості Π²ΠΈΠ»ΠΈΠ²ΠΊΡ–Π² ΠΊΡƒΠ»ΡŒ ΠΏΡ€ΠΈ Π·Π±Ρ–Π»ΡŒΡˆΠ΅Π½Π½Ρ– масової частки Ρ…Ρ€ΠΎΠΌΡƒ Π² Ρ‡Π°Π²ΡƒΠ½Ρ– Π² ΠΌΠ΅ΠΆΠ°Ρ… Π΄ΠΎ 1%. ΠŸΡ€ΠΈ Ρ†ΡŒΠΎΠΌΡƒ Π½Π°ΠΉΠ±Ρ–Π»ΡŒΡˆΠ΅ зростання Π΄ΠΈΠ½Π°ΠΌΡ–Ρ‡Π½ΠΎΡ— міцності ΡΠΏΠΎΡΡ‚Π΅Ρ€Ρ–Π³Π°Ρ”Ρ‚ΡŒΡΡ ΠΏΡ€ΠΈ Π·Π±Ρ–Π»ΡŒΡˆΠ΅Π½Π½Ρ– масової частки Ρ…Ρ€ΠΎΠΌΡƒ Π²Ρ–Π΄ 0,3% Π΄ΠΎ 0,5%. ΠŸΡ€ΠΈ ΠΏΠΎΠ΄Π°Π»ΡŒΡˆΠΎΠΌΡƒ зростанні вмісту Ρ…Ρ€ΠΎΠΌΡƒ ΡƒΠ΄Π°Ρ€ΠΎΡΡ‚Ρ–ΠΉΠΊΡ–ΡΡ‚ΡŒ Π±Ρ–Π»ΠΎΠ³ΠΎ низьколСгованого Ρ‡Π°Π²ΡƒΠ½Ρƒ ΠΏΡ–Π΄Π²ΠΈΡ‰ΡƒΡ”Ρ‚ΡŒΡΡ мСнш ΠΏΠΎΠΌΡ–Ρ‚Π½ΠΎ Ρ– ΠΏΡ€ΠΈ вмісту Ρ…Ρ€ΠΎΠΌΡƒ 0,7-0,8% досягає максимуму. A study of the dynamic strength (impact resistance) of grinding bodies cast from low-chromium cast iron in a multi-seat chill mold depending on the chromium content in the alloy is carried out. As a starting point, cast iron of the following composition was used: carbon – 3,0%, silicon – 1,6%, manganese – 0,4%, sulfur – 0,05%, phosphorus – 0,06%. For the study, several batches of balls with a diameter of 60 mm were cast with different chromium content in cast iron, from 0 to 1%. Cast iron was smelted in a mediumfrequency induction furnace, such as IChT, with the main lining on a charge of pure pig iron and steel low-carbon scrap. The temperature of cast iron production was 1500 Β°C. Liquid cast iron was subjected to alloying with medium carbon ferrochrome. Balls were cast in multi-seat chill molds. When tested for impact resistance, the grinding ball received a striking blow of mass 50 kg, falling from a height of 0,5 m. The frequency of application of dynamic loads was 10 beats per minute. Impact resistance was determined by the average number of impacts sustained by the grinding body prior to destruction. An increase in the impact resistance of ball castings has been established with an increase in the mass fraction of chromium in cast iron up to 1%. Moreover, the greatest increase in dynamic strength is observed with an increase in the mass fraction of chromium from 0,3% to 0,5%. With a further increase in the chromium content, the impact resistance of white low-alloy cast iron increases less noticeably, and in the presence of chromium 0,7-0,8% reaches a maximum. The difference in hardness from the surface (~ 52 HRC) to the center of the ball (~ 42 HRC) is a value of about 10 units. The established impact resistance of grinding bodies made it possible to conclude: when grinding solid rocks with high content of solid quartz, the use of low chromium cast iron as a material for grinding media is the most effective, as in terms of achieve high impact resistance, and to ensure cost-effective performance. ΠŸΡ€ΠΎΠ²Π΅Π΄Π΅Π½ΠΎ исслСдованиС динамичСской прочности (ударостойкости) ΠΌΠ΅Π»ΡŽΡ‰ΠΈΡ… Ρ‚Π΅Π», ΠΎΡ‚Π»ΠΈΡ‚Ρ‹Ρ… ΠΈΠ· низкохромистого Ρ‡ΡƒΠ³ΡƒΠ½Π° Π² многомСстном ΠΊΠΎΠΊΠΈΠ»Π΅, Π² зависимости ΠΎΡ‚ содСрТания Ρ…Ρ€ΠΎΠΌΠ° Π² сплавС. УстановлСно ΠΏΠΎΠ²Ρ‹ΡˆΠ΅Π½ΠΈΠ΅ ударостойкости ΠΎΡ‚Π»ΠΈΠ²ΠΎΠΊ ΡˆΠ°Ρ€ΠΎΠ² ΠΏΡ€ΠΈ ΡƒΠ²Π΅Π»ΠΈΡ‡Π΅Π½ΠΈΠΈ массовой Π΄ΠΎΠ»ΠΈ Ρ…Ρ€ΠΎΠΌΠ° Π² Ρ‡ΡƒΠ³ΡƒΠ½Π΅ Π² ΠΏΡ€Π΅Π΄Π΅Π»Π°Ρ… Π΄ΠΎ 1%. ΠŸΡ€ΠΈ этом наибольший рост динамичСской прочности Π½Π°Π±Π»ΡŽΠ΄Π°Π΅Ρ‚ΡΡ ΠΏΡ€ΠΈ ΡƒΠ²Π΅Π»ΠΈΡ‡Π΅Π½ΠΈΠΈ массовой Π΄ΠΎΠ»ΠΈ Ρ…Ρ€ΠΎΠΌΠ° ΠΎΡ‚ 0,3% Π΄ΠΎ 0,5%. ΠŸΡ€ΠΈ дальнСйшСм ростС содСрТания Ρ…Ρ€ΠΎΠΌΠ° ΡƒΠ΄Π°Ρ€ΠΎΡΡ‚ΠΎΠΉΠΊΠΎΡΡ‚ΡŒ Π±Π΅Π»ΠΎΠ³ΠΎ Π½ΠΈΠ·ΠΊΠΎΠ»Π΅Π³ΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ Ρ‡ΡƒΠ³ΡƒΠ½Π° ΠΏΠΎΠ²Ρ‹ΡˆΠ°Π΅Ρ‚ΡΡ ΠΌΠ΅Π½Π΅Π΅ Π·Π°ΠΌΠ΅Ρ‚Π½ΠΎ, ΠΈ ΠΏΡ€ΠΈ Π½Π°Π»ΠΈΡ‡ΠΈΠΈ Ρ…Ρ€ΠΎΠΌΠ° 0,7-0,8% достигаСт максимума.