April 2015, № 4 (179)

Denisov A.C., Galiyev P.K., Kulakov A.T., Kovalenko S.Yu. ENSURING MAINTAINABILITY OF THE NITRATED CRANKED SHAFT WITH ELECTROEROSIVE PROCESSING OF NECKSResults of the research aimed at providing maintainability of the nitrated cranked shaft are presented in this work. The analysis of operational reliability of KamAZ engines with the nitrated cranked shaft showed high wear resistance of these shafts. At the same time, the teases arising at operation on necks of a shaft it is almost impossible to eliminate with the standard methods of processing because of the high hardness of a blanket, and the surface on the nitrated layer is impossible that leads to utilization of a shaft. Besides, thickness of the nitrated layer is smallest that allows to process a shaft no more, than on one repair size. Thereof, maintainability of the nitrated cranked shaft is the extremely unsatisfactory and considerably increases costs for operation of vehicles. So, at the average market price of a cranked shaft of 93 thousand rubles. The program of production of 50 thousand engines and level of annual rejection of 0,03 losses of consumers will make 697,5 million rubles. The possibility of a surface of necks of the nitrated shaft in operation requires removal of the nitrated layer with the minimum expenses of resources and time. One of the technologies meeting these requirements is the developed technology of repair with removal of the nitrated layer in the electroerosive way on depth of 0,4 mm in a condition of the main structure that provides possibility of induction training or a surface without emergence on cranked shaft of cracks, peelings, blistering. After that necks of a shaft strengthen TVCh and resurfacing in the conditions of manufacturer or build up with the subsequent polishing and polishing in the conditions of repair productions in the established sizes. The subsequent repolishing of necks on the established size allows to restore to 80 % of cranked shaft with teases of necks. The offered technology showed the working capacity and efficiency at tests, is applicable both in the conditions of repair production, and in the conditions of manufacturer with use of the standard equipment with considerable economy of resources in comparison with the existing repair methods.Key words: cranked shaft, heat treatment, nitriding, electroerosive processing.

Download

References:

1. Avdonkin, F.N. Optimization of change of technical condition of the car in use / F.N. Avdonkin. — М: Transport. — 1993. — 350 pages.

2. Denisov, Ampere-second. Bases of formation of an operational and repair cycle of cars/Ampere-second. Denisov. — To Saratov:sgt. — 1999. — 352 pages.

3. Denisov, A.S.Analiz of the reasons of operational destructions shatunnykh of inserts/Ampere-second. Denisov, A.T. Kulakov//Engine-building, 1981. — No. 9. — Page 37-40.

4. Denisov, Ampere-second. Change of conditions of greasing shatunnykh of bearings in use automobile diesel/Ampere-second. Denisov, A.T. Kulakov//Engine-building. — 1986. — No. 4. — Page 44-46.

5. Chernyshov, Г.Д.Ремонт YaMZ engines / G. D. Chernyshov, G. I. Sozinov, V. M. Krotov, V.A. Beschastnov//Moscow: Transport. — 1974. –

Page 21-30).

6. Research of maintainability of cranked shaft of engines KAMAZ. Technical report of STC "KAMAZ"//Naberezhnye Chelny. — 2004. — 56s.

7. Denisov, Ampere-second. Improvement of a design of a cranked shaft on conditions of their greasing/Ampere-second. Denisov, A.T. Kulakov, N. I. Svetlichny, A.A. Gafiyatullin//Engine-building. — 2003. — No. 3. — Page 24-26.

8. Operation manual, to maintenance and repair of engines 740.11 — 240; 740.13-260; 740.14-300 / Naberezhnye Chelny. — 2001. — JSC KAMAZ. — 131s.

9. Operation manual on engines KAMAZ of the ecological classes EBPO-2 and EBPO-3//Naberezhnye Chelny: JSC KAMAZ. — 2007. –

125 pages.

10. Patent RU№2487002. A way of repair of the necks of cranked shaft of engines of internal combustion strengthened by nitriding / R. K. Galiyev, Fists A.T., Denisov A.S., Gafiyatullin A.A. — опубл. 10.07.13. — Bulletin No. 10. — 5 pages: silt.

About this article

Authors: Denisov A.S., Kulakov A.T., Kovalenko S.Yu.

Year: 2015

Editor-in-chief

Sergey Aleksandrovich
MIROSHNIKOV

© Электронное периодическое издание: ВЕСТНИК ОГУ on-line (VESTNIK OSU on-line), ISSN on-line 1814-6465
Зарегистрировано в Федеральной службе по надзору в сфере связи, информационных технологий и массовых коммуникаций
Свидетельство о регистрации СМИ: Эл № ФС77-37678 от 29 сентября 2009 г.
Учредитель: Оренбургский государственный университет (ОГУ)
Главный редактор: С.А. Мирошников
Адрес редакции: 460018, г. Оренбург, проспект Победы, д. 13, к. 2335
Тел./факс: (3532)37-27-78 E-mail: vestnik@mail.osu.ru