SU733823A1

SU733823A1 - Method of restoring weared toothed gears

Info

Publication number: SU733823A1
Application number: SU752109043A
Authority: SU
Inventors: Нил Николаевич Дорожкин; Вячеслав Алексеевич Карпушин; Олег Игоревич Кузьменков; Алексей Степанович Попов; Владимир Кириллович Ярошевич
Original assignee: Институт Проблем Надежности И Долговечности Машин Ан Белорусской Сср
Priority date: 1975-02-28
Filing date: 1975-02-28
Publication date: 1980-05-15

Description

(54) СПОСОБ ВОССТАНОВЛЕНИЯ ИЗНОШЕННЫХ ЗУБЧАТЫХ КОЛЕС(54) METHOD OF RESTORING FRAUDED GEAR WHEELS

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Изобретение относитс к области обработки металлов давлением, а именно к способам восстановлени зубчатых колес.This invention relates to the field of metal forming, in particular to methods for restoring gear wheels.

Известен способ упрочн юще-восстанавливаю щей электроферромагнитной обработки зубчатых колес с большим модулем 1. Обрабатываемое зубчатое колесо устанавливаетс в эЛектроизопированных центрах станка, а наконечник сердечника электромагнита совершает движение по копиру, сходное с кинематикой формообразовани зубьев резанием. Колесо и наконечник сердечника электромагнита подключают к полюсам генератора электрических импульсов. В зазор между деталью и наконечником сердечника непрерывно подаетс металлический порошок, который, удержива сь в зазоре магнитньш полем,; замыкает электрическую цепь наконечник-деталь, расплавл етс в сложном взаимодействии электрических и магнитных полей и наноситс на обрабатываемую поверхность.There is a known method of strengthening-restoring electro-ferromagnetic processing of gear wheels with a large module 1. The gear to be machined is installed in electroplating centers of the machine, and the tip of the core of an electromagnet makes a copy similar to the kinematics of shaping teeth by cutting. The wheel and the tip of the core of the electromagnet are connected to the poles of the electric pulse generator. A metal powder is continuously fed into the gap between the part and the tip of the core, which is held in the gap by a magnetic field; closes the tip-part electrical circuit, melts in a complex interaction of electric and magnetic fields, and is applied to the work surface.

Недостатком указаш1ого способа вл етс мала толщина наносимого восстанавливающего сло (до 0,2 мм).The disadvantage of this method is the small thickness of the applied reducing layer (up to 0.2 mm).

Наиболее близким к изобретению по своей технической сущности вл етс способ восстановлени профил зубьев зубчатых колес. При котором в зону деформации между колесом и валком (накатником) подают дополнительный металл в виде ленты, которую накатывают на поверхность зуба, нагретого до температуры пластической деформации 21.The closest to the invention in its technical essence is a method for restoring the tooth profile of gear wheels. In which in the deformation zone between the wheel and the roller (knurled) serves additional metal in the form of a tape, which rolls on the surface of the tooth, heated to a temperature of plastic deformation 21.

Недостаток указанного способа заключаетс в том, что он не обеспечивает восстановлени зубьев зубчатых , имеющих местные дефекты (неравномерный износ, сколы), так как ленту нанос т на всю поверхность колеса , независимо от степени износа отдельных мест.The disadvantage of this method lies in the fact that it does not ensure the restoration of gear teeth with local defects (uneven wear, chips), as the tape is applied to the entire surface of the wheel, regardless of the degree of wear of individual places.

Целью изобретени вл етс восстановление изношенных зубьев или его отдельных участков .The aim of the invention is the restoration of worn teeth or its individual sections.

Claims

This is achieved by using a powder, for example iron, with the addition of alloying elements, such as boron and silicon, which, before rolling, are applied directly to the place of wear of the tooth. The restoration of the teeth according to the proposed method provides an increase in the service life of gears virtually any pattern of wear. Additional metal in the form of metallic steel or iron powder with the addition of alloying elements is applied to the worn surfaces of the gear teeth. Boron, silicon and other elements can be used as dopants, being centers of increased diffusion activity, they significantly reduce the temperature of chemical processes between the powder system and the substrate, and also produce diffusion doping of the powder particles. The gear is then introduced into engagement with the knurling gear and heated by high-frequency currents to a temperature at which the additional metal is connected to the base metal of the gear. An example of the method for restoring the crown of the second gear of the gear unit of the gearbox of the GAZ-51A. Before restoration, the crown is annealed and the defective layer on the emery machine is removed with a specially filled wheel. Then the gear wheel is placed in a device equipped with a breech and an inductor for heating high-frequency current. From the bunker, a mixture consisting of iron powder ПЖ2М with additions of 2.5% boron and 2.5% silicon is fed from the bunker into the gap between the teeth of the nakatnik and the wheel being repaired; the surface of the teeth. Heating of the tooth surface to be restored is carried out up to 1000-1050 ° C with simultaneous application of a rolling force of 0.5-1.0 kg / cm. After the layer is baked, the gear wheel is subjected to mechanical processing - cheaking. The use of this method from repair plants will allow the restoration of worn gears with the application of a layer of metal of increased wear resistance to the surface of the teeth, which will increase their service life by almost two times. Claims The method of restoring worn gears by rolling an additional metal on the surface of a gear with simultaneous heating of the teeth of the gear, characterized in that, in order to restore a gear having significant local wear of the teeth, powder is used as an additional metal With the addition of alloying elements, such as boron and silicon, which before rolling is applied directly to the place of wear of the tooth. Sources of information taken into account when examining 1.Shulev G. O., Chemisov B. L. Electromagnetic processing of machine parts, Central Scientific Research Institute of Thermal Engineering, M., 1973, p. 20-80.

2. Authors svdedelstvo USSR № 490543, cl. B 21 N 5/00, 1975.