Jahonda yiliga 555,6 teravatt-soat energiya yeyilgan mashina
qismlarini qayta tiklash, almashtirish va yeyilish natijasida buzilish ehtimoli
bo‘lgan qismlarni zaxirada saqlash uchun sarflanadi. Tog‘-kon sanoatida eng ko‘p
energiya iste’moli uchun sarflanadigan mablag‘lar ma’danlarni maydalash (33 %),
tashish (24 %), ventilatsiya tizimi (9 %) va qazib olish (8 %) ulushiga to‘g‘ri keladi.
Mashinasozlik sanoatining hozirgi kundagi asosiy vazifalaridan biri tez yeyiluvchi
mashina detallarining ishlash muddatini oshirishdir. Ushbu tadqiqotda turli
miqdordagi xromli oq cho‘yanlar strukturasiga termik ishlov berishning ta’siri tahlil
qilindi. Strukturadagi o‘zgarishlarni kuzatish va uning yeyilishga bardoshliligini
oshirish uchun quyma materiallarga termik ishlov berildi. Termik ishlov berish
quyidagi tartibda amalga oshirildi: 1) toblash – har bir materialning ikkita namunasi
1 soat davomida 1000 oC harorat oralig‘ida ushlab turildi va moy bilan sovitildi;
2) bo‘shatish – 200 oC haroratda 2 soat davomida ushlab turildi va xona haroratida
sovitildi. Bundan tashqari, quyma namunalarning mikro strukturasini o‘rganish va
ularning termik ishlov berish jarayonidan keyingi holatini solishtirish uchun har
bir materialdan olingan namunalar quyma holida qoldirilgan. Tahlil natijalariga
ko‘ra, Cr miqdori 31 % bo‘lgan va termik ishlov berilib, moy bilan sovitilgan namuna
eng yaxshi xususiyatlarni ko‘rsatdi. Eng yomon ko‘rsatkichlar esa Cr miqdori 28 %
bo‘lgan, termik ishlov berilgan va havoda sovitilgan namunada qayd etildi.
Jahonda yiliga 555,6 teravatt-soat energiya yeyilgan mashina
qismlarini qayta tiklash, almashtirish va yeyilish natijasida buzilish ehtimoli
bo‘lgan qismlarni zaxirada saqlash uchun sarflanadi. Tog‘-kon sanoatida eng ko‘p
energiya iste’moli uchun sarflanadigan mablag‘lar ma’danlarni maydalash (33 %),
tashish (24 %), ventilatsiya tizimi (9 %) va qazib olish (8 %) ulushiga to‘g‘ri keladi.
Mashinasozlik sanoatining hozirgi kundagi asosiy vazifalaridan biri tez yeyiluvchi
mashina detallarining ishlash muddatini oshirishdir. Ushbu tadqiqotda turli
miqdordagi xromli oq cho‘yanlar strukturasiga termik ishlov berishning ta’siri tahlil
qilindi. Strukturadagi o‘zgarishlarni kuzatish va uning yeyilishga bardoshliligini
oshirish uchun quyma materiallarga termik ishlov berildi. Termik ishlov berish
quyidagi tartibda amalga oshirildi: 1) toblash – har bir materialning ikkita namunasi
1 soat davomida 1000 oC harorat oralig‘ida ushlab turildi va moy bilan sovitildi;
2) bo‘shatish – 200 oC haroratda 2 soat davomida ushlab turildi va xona haroratida
sovitildi. Bundan tashqari, quyma namunalarning mikro strukturasini o‘rganish va
ularning termik ishlov berish jarayonidan keyingi holatini solishtirish uchun har
bir materialdan olingan namunalar quyma holida qoldirilgan. Tahlil natijalariga
ko‘ra, Cr miqdori 31 % bo‘lgan va termik ishlov berilib, moy bilan sovitilgan namuna
eng yaxshi xususiyatlarni ko‘rsatdi. Eng yomon ko‘rsatkichlar esa Cr miqdori 28 %
bo‘lgan, termik ishlov berilgan va havoda sovitilgan namunada qayd etildi.
Ежегодно в мире 555,6 тераватт-часов энергии расходуется на
восстановление, замену и хранение запасных частей машин, которые могут
выйти из строя в результате износа. В горнодобывающей промышленности
наибольшая доля затрат энергии приходится на дробление руды (33 %),
транспортировку (24 %), систему вентиляции (9 %) и добычу (8 %). Одной из
ключевых задач современного машиностроения является увеличение срока
службы быстроизнашивающихся деталей машин. В данном исследовании
проанализировано влияние термической обработки на структуру белых
чугунов с различным содержанием хрома. Для наблюдения изменений
в структуре и повышения износостойкости литейные материалы
подвергались термической обработке. Термическая обработка проводилась
в следующем порядке: 1) закалка – два образца каждого материала
выдерживались при температуре 1000 oC в течение одного часа и охлаждались
в масле; 2) освобождение – выдерживались при температуре 200 oC в течение
двух часов и охлаждались до комнатной температуры. Кроме того, для
изучения микроструктуры литых образцов и сравнения их состояния после
термической обработки образцы каждого материала оставлялись в литом состоянии. Согласно результатам анализа, образец с содержанием Cr 31 %,
подвергнутый термической обработке и охлаждённый в масле, показал
наилучшие характеристики. Наихудшие показатели были зафиксированы
у образца с содержанием Cr 28 %, подвергнутого термической обработке и
охлаждённого на воздухе.
EEvery year, 555.6 terawatt-hours of energy are consumed worldwide to restore, replace, and store machine parts that can fail due to wear. In the mining industry, the largest share of energy costs is accounted for by ore crushing (33%), transportation (24%), ventilation system (9%), and extraction (8%). One of the key tasks of modern mechanical engineering is to increase the service life of quickly wearing machine parts. This study analyzes the effect of heat treatment on the structure of white cast irons with different chromium contents. To observe changes in the structure and improve wear resistance, the casting materials were subjected to heat treatment. Heat treatment was carried out in the following order: 1) quenching - two samples of each material were kept at a temperature of 1000 oC for one hour and cooled in oil; 2) release - kept at a temperature of 200 oC for two hours and cooled to room temperature. In addition, to study the microstructure of the cast samples and compare their condition after heat treatment, samples of each material were left in the cast state. According to the analysis results, the sample with a Cr content of 31%, subjected to heat treatment and cooled in oil, showed the best characteristics. The least indicators were recorded for the sample with a Cr content of 28%, subjected to heat treatment and cooled in air.
| № | Author name | position | Name of organisation |
|---|---|---|---|
| 1 | Hamroyev N.N. | doktorant | Navoiy davlat konchilik va texnologiyalar universiteti |
| 2 | Egamberdiyev . . | texnika fanlari doktori, professor | Navoiy davlat konchilik va texnologiyalar universiteti |
| 3 | Ashurov .X. | doktorant | Navoiy davlat konchilik va texnologiyalar universiteti |
| 4 | Saibov .F. | doktorant | Navoiy davlat konchilik va texnologiyalar universiteti |
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