DEP0046522DA - Process for making the running surfaces of cast iron engine cylinders, piston rings and other machine and transmission parts resistant to wear - Google Patents

Description

leor.ardus ieolaas Josef ν? β j. ac η β π and

Michael

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Extension to. '/ fixing the curses of cast iron Kotor cylinders, Piston rings and others; aschinen- and iitil

: - Those made of cast iron, such as iilotor cylinders, Holbenri'nge and other machine and transmission parts, which are loaded under friction, are regularly both a mechanical wear and tear due to the action of the surfaces that come into contact with them , bump or hitting them, as well as chemical wear and tear or corrosion as a result of attack by lubricants or their decomposition products, or other liquids or gases

This wear and tear creates difficult problems and limits the useful life of such items® which can only be used with certain, precisely adapted dimensions »3o may ζ · Β · in practice wear and tear the vehicle engine cylinder should not be more than about 0.3 mm, rac'-idec the cylinder is worn out, out it has to be overhauled and the sanded-off layer has to be supplemented accordingly.

In addition, the expedient and quick break-in of the Hotor® as well as the avoidance of eating is very important of great practical importance.

By increasing the speed and compression of the modern. ": Otors are generally more demanding in relation to an exact. bseal for large

Velocities These requirements are met by means of special piston rings, namely by means of the so-called «. : iochspan; vungsringt ₈ whereby the tension at the closing opening is selected to be higher than on any other PurJrt d @ 3 circumference in order to prevent the feared vibration of the Ring® at high speeds. In addition, the initial tension of the new ring is usually chosen to be somewhat higher than is absolutely necessary in order to compensate for the loss of tension caused by the high combustion temperature during use of the engine _e B3 has also been shown in practice that most new or overhauled engines are handled in a very unprofessional manner during the first few hours of their use »

The aim of the invention is to eliminate the difficulties in running in Kotoren, the Sinlaufzeit can be significantly reduced, and in general the surface areas of the machine parts subjected to friction to make versc-wear-resistant, so that their service life can be extended significantly,

According to the invention, this can be achieved in that the machined, non-polished running surface the cast iron. '.! otor cylinders, piston rings or other machine or transmission parts of a Anodic treatment in contact with an acidic heating fluid is subjected, which causes the tread De-icing takes place with the formation of a non-detachable superficial layer: 21t increased carbon or 3raphite content "

For example, can DI® Ee2iandliing after Srfindung carried out at einejn only finely drilled Motorzylinver which to the Eeizwirkang bill to contract @ n _s

Among other things, a small fraction of an inch less than the required pitch is drilled out, and the customary pocket drilling or polishing of the cylinder wall is dispensed with Bad®, which can consist of an acidic pickling liquid with, for example, 150 »3oo ffranm chromic acid (CrO,) per liter, with the addition of O ₉ I = 1 cm of a highly concentrated sulfuric acid solution, the said tread on the positive pole of one duroh daa Bod-accompanied direct current is connected from a thickness of 2o to 80 a / dm _e iTach a treatment at a! temperature of 3o ° -6o ° C for 2 to 15 minutes is the Beizwirk-rng progressed so far that by ■ ie resolution iat originated OCE JSisenteilchen sine porous surface, wherein the graphite is exposed in the Bohrkratzen _e the various conditions of the anodizing treatment are controlled so limited and that the graphite layer formed does not dissolve, but remains intimately and firmly connected to the iron material. When the motor runs in, this soft graphite layer is then rubbed into the porous lower layer, with the cylinder deformation (as a result of mechanical and thermal stresses) being almost completely compensated for will; In this way, a gas-tight adaptation of the piston rings is achieved in the shortest possible time.

The layer formed according to the invention and having a high graphite content provides a surface with excellent properties lubricating properties, as the free graphite can absorb relatively large amounts of lubricating oil »

exiizufolge the Sir.laufen dsr Eolbe.nringe can in cylinders under 'e' ¹ g'nst "happen CONDITIONS loads and Heibu.g -. vird, ever rehr well aufg ^ noijaen, -wodurch the mec'i-r.nische flird greatly reduced bnutzung _e Ltsrdies

Thanks to its high graphite content, the surface provides strong resistance to chemical · .attacks and Corrosion ».

'Tach Slidung of the superficial layer of high Sraphitgehalt (graphitization) it is advisable to immerse the treated Oberfläch® some Uinuten at a temperature of 5o to loo ⁰ G in an oil bath "

Claims (1)

Claim, Method for wear-resistant niches d®r running surface τοη cast-iron engine cylinders, piston rings and other machine and transmission parts and to prevent scuffing * marked the · di®ab®dr®h * ·, nieht-polished® running surface © of an * 'anodic treatment in contact with an acidic one Irritant. is subjected to that the tread is de-iced forming a self non-dissolving * superficial layer with increased carbon or graphite content 2 ^ T Ebtorzylind © r _f piston rings or ^^ sÄer® Kaschintnod®r Tranamissionsteile, de ^^ efiyerschleissflä® is provided with a non-detachable superficial layer with geete ^ gertein graphite content, which ^ ilirch anodic treatment in contact with eijaeTrauren pickling liquid after the Process iss claim 1 has been formed » ■ # ■) such