182

The article shows the findings of research studies of earth working machines made of locally manufactured carbon steel cast needle spinning stars. The chemical composition, mechanical characteristics and macro- and microstructure parameters of the steels under study have been investigated. Optimal chemical and thermal treatment modes were applied-nitro cement with subsequent hardening and low tempering. The quenching was carried out directly from the furnace after the entire nitro cement period, setting up to 800-825оС. As within 6-8 hours, and hardened samples were released at 180-200оС. Sample hardness and microhardness were measured before and after heat treatment, and abrasive wear was tested on the working surface. The wear resistance of cast parts has been shown to increase by 2-3 times after optimal heat treatment.

  • Web Address
  • DOI
  • Date of creation in the UzSCI system22-02-2021
  • Read count180
  • Date of publication25-10-2020
  • Main LanguageIngliz
  • Pages217-222
English

The article shows the findings of research studies of earth working machines made of locally manufactured carbon steel cast needle spinning stars. The chemical composition, mechanical characteristics and macro- and microstructure parameters of the steels under study have been investigated. Optimal chemical and thermal treatment modes were applied-nitro cement with subsequent hardening and low tempering. The quenching was carried out directly from the furnace after the entire nitro cement period, setting up to 800-825оС. As within 6-8 hours, and hardened samples were released at 180-200оС. Sample hardness and microhardness were measured before and after heat treatment, and abrasive wear was tested on the working surface. The wear resistance of cast parts has been shown to increase by 2-3 times after optimal heat treatment.

№ Name of reference
1 1. Vorobyov V. G. Technology of heat treatment of typical machine-building parts. - M.: NTO Mashprom, 2006. - 165 p.
2 2. Lakhtin Yu. M. Progressive technology of chemical and thermal treatment of steel. - M.: NTO Mashprom, 2008. - 247 p.
3 3. Gulyaev A. P. Metallurgy - M.: Alliance, 2011. - 536 p.
4 4. Voroshnin L. G., Mendeleeva O. L., Smetkin V. A. Theory and technology of chemical and thermal treatment. - Moscow: Minsk, 2010. - 304 p.
5 5. Zinchenko V. M. Engineering of the gear wheel surface by chemical and thermal treatment methods - Moscow: Bauman Moscow state technical University, 2001.- 303 p.
6 6. Gusovsky V. L., Lifshits A. E. Methods for calculating heating and thermal furnaces. - Moscow: Teplotekhnik, 2004. - 400 p.
7 7. Morgunov V. N. Furnaces of foundry shops. - M.: Penza, 2009. - 179 p.
8 8. Tilabov B. K., Sherbytaev Zh. A., Normurodov U. E. anti-Wear hard-alloy coatings for parts of agricultural machines and mechanisms // universum: technical Sciences-Moscow, 2020. No. 1.P. 32-38.
9 9. Normurodov U.E. Foundry properties of induction and carriage cast irons // Higher school scientific and practical journal-Russia, 2018. No. 7.P. 20-22.
10 10. Tilabov B. K. Investigation of the surface layer of carbon and alloy steels after heating of HDPE. // Collection of materials of the International scientific and practical conference on: "Modern materials, equipment and technologies in mechanical engineering" April 19-20, 2012. Andijan machine-building Institute, - Andijan, 2012. P. 223-226.
11 11. Mukhamedov A. A., Tilabov B. K. increasing the wear resistance of parts with hard-alloy coatings by heat treatment // Metal science and heat treatment of metals - Moscow: Russia, 2003. No. 3.P. p.29-31.
12 12. Mukhamedov A. A. Influence of the thermal prehistory of steel on its wear resistance during rolling friction with slippage // Gorny Vestnik. - Navoi, 2012. No. 1. P. 110-112.
13 13. Tilabov B.K. Improving working efficiency and durability of cast parts of tilling machines // European Science Review. «East West» Association for Advanced Studies and Higher Education GmbH. – Vena, Austria, 2016. #7-8. - P.23-27.
14 14. Tilabov B.K. Increase the service life of cast parts tilling machines // International Conference «Global Science and Innovation» March 23-24, 2016. – USA. Chicago, 2016.P.222-225.
15 15. Tilabov B.K., Muhamedov A.A. Increased durability of iron parts by thermal treatment with double phase recrystallization. European applied sciences. Europaische Fachhochschule // ORT Publishing. - Germania, 2015. №8. P.49-53.
16 16. Talibov B. K. Fundamentals of the theory and technology of a new and promising process to manufacture cast machinery parts with wear-resistant carbide coating by casting on gasified models. Monograph. – Tashkent. Fan WA technology. - 2015, 160 p.
Waiting