Strength and Durability Characteristics of Soil-Cutting Working Tools

The most important task in designing competitive agricultural machinery is the production of parts with long service life. The development of new technologies and materials determines the technical level of agricultural engineering. The plowshare blade is the most loaded and important part, as its parameters determine the quality, energy and economic indicators of the technological operation of plowing. (Research purpose) To determine and confi rm theoretically material and technological parameters of low quality level of domestic plowshares manufactured without the use of modern technologies. Then they analyze construction materials of plowshares and other parts of tillage implements produced by leading foreign companies, and come to a conclusion that lowand medium-carbon boron-containing alloyed and high-alloyed steels are used in their production. Leading global manufacturers of machine parts also often apply surface hardfacing with carbide coatings. (Results and discussion) The authors have theoretically and experimentally determined the directions of increasing the strength and durability of plowshare working tools. They have chosen basic materials for plowshares basing mainly on the strength parameters. They have conducted comparative laboratory tests of various materials and witness samples (including double-layer ones) for abrasive wear resistance on two bench installations; identifi ed materials for carbide coatings, clarifi ed the relative wear resistance coeffi cients of steel carbide layers recommended for use in the design of plowshares; and considered a technological method of hardening machine working tools. (Conclusions) The authors propose a simplifi ed computational procedure for selecting design and material parameters (thickness and width of hardening coatings) of plowshare blades and over-chisels, depending on the wear characteristics of the materials used and the plowshare thickness. They have stated mathematical relationships that determine the linear wear of plowshare blades and chisels depending on the characteristics of the materials used, design parameters, soil conditions and total operation time and carried out comparative operational and duration testing of newly developed plowshares. It has been shown that the marginal operating time of new products exceeds the duration indicators of serial counterparts in diff erent soil and climatic conditions in 3.5-5.5 times.

1. Sineokov G.N., Panov I.M. Teoriya i raschet pochvoobrabatyvayushchikh mashin [Theory and calculation of tillage machines]. Moscow: Mashinostroyeniye. 1977. 328 (In Russian).

2. Izmaylov A.Yu., Sidorov S.A., Khoroshenkov V.K., Khlusova E.I., Ryabov V.V. Novel high-alloy boron-containing steels for driven elements of tilling machines. Metal Science and Heat Treatment. 2017. Vol. 59. N3-4. 208-210 (In English).

3. Sidorov S.A., Khoroshenkov V.K., Lobachevskii Ya.P., Akhmedova T.S. Improving wear resistance of agricultural machine components by applying hard-alloy thick-layer coatings using plasma surfacing. Metallurgist. 2017. Vol. 60. N11-12. 1290-1294 (In English).

4. Sidorov S.A., Lobachevskii Ya.P., Khoroshenkov V.K., Akhmedova T.S., Vorob’ev D.A. Wear and breakage resistance of hard alloy coatings strengthened with tungsten carbide. Metallurgist. 2018. Vol. 61. N11-12. 1023-1028 (In English).

5. Izmaylov A.Yu., Sidorov S.A., Lobachevskiy Ya.P., Khoroshenkov V.K., Kuznetsov P.A., Yurkov M.A., Golosiyenko S.A. Nauchnyye printsipy povysheniya iznosostoykosti rabochikh organov pochvoobrabatyvayushchey tekhniki [Scientific principles of improving the durability of the working tools of tillage equipment]. Vestnik Rossiyskoy akademii sel'skokhozyaystvennykh nauk. 2012. N3. 5-7 (In Russian).

6. Mironov D.A., Liskin I.V., Sidorov S.A. Vliyaniye geometri cheskikh parametrov dolota na tyagovyye kharakteris tiki i resurs lemekhov otechestvennykh plugov [Influence of the geometrical parameters of chisels on the traction characteristics and durability of domestic plowshares]. Sel'skokhozyaystvennye mashiny i tekhnologii. 2015. N6. 25-29 (In Russian).

7. Izmaylov A.Yu., Lobachevskiy Ya.P., Sidorov S.A., Khoroshenkov V.K., Luzhnova Ye.S., Mironov D.A., Zaytsev A.I., Rodionova I.G., Pavlov A.A., Amezhnov A.V. Ispol'zovaniye bimetallicheskikh staley dlya povysheniya resursa rabochikh organov sel'skokhozyaystvennykh mashin [The use of bimetallic steels to increase the resource of the working tools of agricultural machines]. Vestnik Rossiyskoy akademii sel'skokhozyaystvennykh nauk. 2013. N2. 80-81 (In Russian).

8. Mazitov N.K., Lobachevskiy Ya.P., Rakhimov Z.S., Khlyzov N.T., Sharafiyev L.Z., Sadriyev F.M., Dmitriyev S.Yu. Rossiyskaya tekhnologiya obrabotki pochvy i poseva na osnove sobstvennykh konkurentospochsobnykh innovatsionnykh mashin [Russian technology of tillage and seeding performed by competitive innovative domestic machines]. Dostizheniya nauki i tekhniki APK. 2014. N7. 68-70 (In Russian).

9. Sidorov S.A., Mironov D.A. Obosnovaniye povysheniya ekspluatatsionnoresursnykh kharakteristik lemekhov plugov [Determining the ways of improving the operational and durability characteristics of plowshares]. Sel'skokhozyaystvennye mashiny i tekhnologii. 2013. N6. 14-17 (In Russian).

10. Mudarisov S.G., Gabitov I.I., Lobachevskiy Ya.P., Mazitov N.K., Rakhimov R.S., Khamaletdinov R.R., Rakhimov I.R., Farkhutdinov I.M., Mukhametdinov A.M., Gareev R.T. Modeling the technological process of tillage. Solli Tillge Reseaarch. 2019. Vol. 190. 70-77.