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Influence of the nitrided layer thickness of dies made of two types of tool steel used in hot extrusion of valve forgings made of nickel–chromium steel on the durability of these tools

Hawryluk Marek, Lachowicz Marzena, Janik Marta, Ziemba Jacek, Gronostajski Zbigniew

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 4

277--293

EN

The study constitutes an analysis of the durability of dies used in the first operation of producing valve forgings from chromium–nickel steel (NCF 3015) for motor trucks. The average durability of the dies (subjected to standard thermal treatment and nitriding) in this operation equals about 800 forgings. To perform an in-depth analysis of the effect of the nitrided layer thickness (0.1 mm and 0.2 mm) and the tool material (W360 and QRO90) on the possibilities of increasing the die durability, complex studies were carried out, which included: a macroscopic analysis combined with 3D scanning, microstructural examinations using a scanning microscope and a metallographic microscope, as well as hardness measurements. A minimum of three tools were tested for different variants, and for each of them, one representative die was selected for detailed examinations. The research showed the presence of abrasive wear, thermo-mechanical fatigue and traces of adhesive wear as well as plastic deformation on the surface of the working impressions. Also observed was the effect of the extruded material sticking to the tools (high friction and the presence of intermetallic phases in the extruded material) and the forging being blocked in the smallest section of the die, which is a critical factor causing a production shutdown and the necessity of tool replacement. The highest mean durability equalling 2600 forgings was obtained for the dies with a lower carbon content and a higher content of vanadium and the nitrided layer thickness at the level of 0.2 mm. The lowest mean durability (after one forging item) was recorded for the dies made of steel with a higher carbon content and a higher chromium content, forming less stable compound carbides and the thickness layer at the level of 0.1 mm.

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Use of surface working for improving the working life of piston valves of combustion engines

Filipowicz Krzysztof, Kuczaj Mariusz, Mikuła Stanisław

Transport Problems

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2020

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T. 15, z. 3

107--116

EN

This paper deals with the issue of operating damage of combustion engine valves. It presents an innovative way and construction of a tool for strengthening piston engine valves by way of surface working. It presents the concept of machines for comprehensive surface working and for profiling the faces of combustion engine valves. It also includes the discussion of the methodology of working.

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Powłoki tlenkowe i wytworzone na ich osnowie powłoki kompozytowe przeznaczone na aluminiowe elementy układu elektrycznego sterowania zaworów silników spalinowych

Posmyk A., Bąk Ł.

Transport Problems

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2006

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T. 1, z. 1

71-80

PL

W pracy przedstawiono wpływ technologii wytwarzania anodowych powłok tlenkowych (APT) i wytworzonych na ich osnowie powłok kompozytowych typu APT+MI na ich właściwości izolacyjne. Powłoki te są przeznaczone na aluminiowe uzwojenia elektromagnetycznego sterowania zaworami silników spalinowych. Zastosowanie tych powłok pozwoli na zmniejszenie masy i wymiarów elektromagnesów. Wymaga to opracowania nowej metody pomiaru napięcia przebicia, które jest podstawową wielkością charakteryzującą właściwości elektroizolacyjne powłok.

EN

The influence of producing technology on insulating properties of anodic hard coatings (AHC) and on their matrix produced composite layer AHC+MI has been presented in the paper. Those layers are destined for aluminium winding in electromagnetic steering of engine valves. Using of these layers allows to reduce of electromagnets mass and dimensions, u Inch reduces the fuel consumption. This desire to elaborate a new measurement method of breakdown voltage which is a elementary characteristics of insulating properties of layer.

4

Zmechanizowane i zrobotyzowane napawanie PTA elementów maszyn

Klimpel A., Górka J., Czupryński A., Miler T.

Przegląd Spawalnictwa

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2003

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R. 75, nr 4

1-4

PL

Przykłady zmechanizowanego i zrobotyzowanego napawania proszkowego elementów maszyn. Przedstawiono technologie napawania elementów obrotowych ze stali 34 HM proszkiem na osnowie kobaltu, zaworów silników spalinowych ze stali żaroodpornej oraz regenerację krawędzi form szklarskich z żeliwa stopowego proszkiem na osnowie niklu.

EN

Examples of mechanized and robotized powder pad welding of machine elements. Processes of pad welding of the elements of revolution of 34 HM steel using powder on cobalt groundmass, the IC engine valves of heat resisting steel and regeneration of the edges of glass-making moulds of alloy cast iron using powder on nickel groundmass.