CS242562B1 - Apparatus for carrying out chemical and electrolytic surface treatments in flow-through cavities of machine components, in particular in cylinder bores of internal combustion engines - Google Patents

Abstract

The device allows surface treatment in the machine cavity while protecting the exterior surface from the effects of liquids while immersing the part without limiting their interference with the surface of the cavity. This purpose is achieved by the fact that it consists of a bell whose shell surrounds at least one machine part at the top and sides, and is provided with at least one top opening with a neck, each neck having its inner circumference airtight to the machine part outside and around the top while the lower opening of the bell is free and the bottom opening of each cavity is free flowing.

Description

(54) Equipment for performing chemical and electrolytic surface treatments in flow cavities of machine parts, especially in bores of cylinders of internal combustion engines

The device allows surface treatment in the flow cavity of machine parts while protecting the outer surface from the effect of liquids while immersing the component, without limiting their undisturbed action on the surface of the cavity. This is achieved by comprising a bell having a casing surrounding at least one machine part from above and from the side and having at least one upper opening with a neck, each neck with its inner periphery being airtight to the machine part outside and around the upper part. the bottom opening of the bell is free and the bottom opening of each cavity is free flowing.

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BACKGROUND OF THE INVENTION 1. Field of the Invention

The cylinder bores of internal combustion engines, in particular the aluminum alloy boreholes, are often provided with lining coatings to improve their performance. This is usually done by chemical and electrolytic surface treatments. Surface treatment is only required on the cylindrical surface of the cylinder bore cavity. It is undesirable or even defective on other cylinder surfaces. Therefore, it is necessary that the process liquids through which the surface coatings are carried out act only locally in the bore, and do not wear out or become ineffective by contact with the entire surface of the roll. In particular, air-cooled cylinders have ribs and thus a large outer surface, so that the raw material consumption and the waste volume would be several times higher than necessary for the borehole. The cylinder bore is a cavity, therefore, in electrolytic operations, a so-called internal contour electrode must be inserted coaxially into the bore.

The prior art devices for carrying out chemical and electrolytic surface treatments in the flow-through cavities of machine parts allow liquid to be poured into the cylinder bore sealed at the bottom or fluid flow through the cylinder bore. It is also known to spray liquids directed into the cylinder bore. There are known devices for surface treatment

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242 562 by immersion in process liquids, but with the effect of liquids not only on the cylinder bore, but also on all other cylinder surfaces that are not protected and which liquid can directly wet when the cylinder is immersed ·

Each of these methods has its advantages and limitations and raises different demands on devices, preparations and devices.

Of all the processes mentioned, the draft process has the widest range of applicability, not only in the type of operations and the variety of process fluids, but also in terms of production performance and easy adaptability to the shape or dimensional differences of individual types of rolls of the product range. In addition, the dive method does not require the development and construction of a special single-purpose base device. However, the immersion process does not in itself satisfy the condition that the surface treatment is limited locally to a borehole only.

The drawbacks of the prior art are largely overcome by an apparatus for carrying out chemical and electrolytic surface treatments in the flow-through cavities of machine parts, in particular in the boreholes of internal combustion engine cylinders according to the invention, which consists of a bell having at least one machine enclosure. and has at least one upper orifice opening, each orifice having an inner periphery adjacent to the machine component outside and around the upper opening of the respective surface-treated cavity, while the lower bell opening is free and the lower opening of each cavity is free-flowing.

Another feature of the invention may be that a hollow nozzle is connected airtightly around the lower opening of the surface-treated cavity to connect the cavity to the environment.

The solution according to the invention enables surface treatment in the flow cavity of the machine part while simultaneously protecting the outer surface from the effect of liquids while immersing the part, without limiting their undisturbed action on the bore surface. to define the course of the surface

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Modifying operations only locally to the area of the cylinder bore. The device according to the invention protects, in addition, the outer surface of the component even in the case of spraying from above, so that the invention allows such a technological solution for lines where in each order are submerged and spraying modes of implementation, if such a combination advantageous for technical, economic or environmental reasons.

An exemplary embodiment of a device for carrying out chemical and electrolytic surface treatments in the flow-through cavities of machine parts, in particular in the bores of the cylinders of internal combustion engines according to the invention, is shown in the accompanying schematic drawing.

As is apparent from the drawing, the machine part 1, the cavity 2 of which is to be surface-treated, is mounted on the suspension hook 4 in a vertical position, and the machine part 1 has its upper opening 4 and lower opening 4 free and uncovered. The liquid 2 or the spray from above, the cavity 2 flows freely. A bell 8 is airtightly fastened to the machine part 1, preferably to the upper operational-assembly. The bell 8 is further provided with an upper opening 10 with a neck 12, the neck 12 with its inner periphery being airtight against the machine part 1 outside and around the upper opening 4 of the machine part. The bell 8 does not cover the lower opening 4 and the upper opening 4 of the machine part 1 and leaves them free and flowable, but in other places surrounds the machine part 1 as a helmet from above and from the sides, up to such a point. The depth of the liquid u below the bell 8 at its lower opening 11 is determined not only by the depth of the lower opening 11 of the bell 8, but possibly also by the highest point of the lower opening 8. machine parts 1, if this point lies above the level of the lower opening 11 of the bell 8, The hollow part 7 under the bell 8 has been reliably completely at a sufficient height above the liquid level 5, it is possible to fasten the hollow extension 7 to the lower opening 5 of the machine part 1 and thereby slide the inlet opening from below into the cavity 2 below.

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This measure together with the greater depth of the lower bell opening 11.

it allows to increase the distance between the lower edge of the machine part 1 and the liquid level 6 below the bell 8 at any time.

During vertical immersion of the machine part 1 with the hollow adapter 6 below the bell 8, the closed air remains under the bell 8, which prevents direct contact of the liquid 6 with the outer surface of the machine component 1. Hollow adapter 2 Ιζθ θ ro blame. With respect to the machine part 1, for example a cylinder of an internal combustion engine which has no second operational assembly plane because it is designed so that the cylinder body and its head form a single part, then the tube inserted into the spark plug hole . If the machine part 1 has lateral through holes, for example inlet and exhaust ducts in two-stroke engines, they must be closed on the outside by plugs and similar known methods and means suitable for the case.

The suspension hooks meet the usual and known requirements for the positional fixation of the suspension on the unlabeled conveyed bar during inter-operation transport. In electrolytic operations, they may also function as electrolytic current conductors. They are dimensioned according to mechanical and electrical load and shaped according to the requirements of the used inter-operative transport system.

Under the jacket of one bell 8, one or more machine parts 1 may be protected as described, wherein each machine part 1 may have one or more concurrently treated cavities 2. The bell 8 then has a corresponding number of upper orifices 10 with necks 12.

Claims (2)

SUBJECT OF THE INVENTION 242 562 Apparatus for carrying out chemical and electrolytic surface treatments in flow-through cavities of machine parts, in particular in bores of internal combustion engine cylinders, characterized in that it consists of a bell (8), the shell of which surrounds at least one machine part (1) from above and from the sides; and is provided with at least one upper orifice (10) with a throat (12), each throat (12) with its inner periphery abutting airtight to the machine component (1) outside and around the upper opening (4) of the respective surface-treated cavity (2) ), while the lower opening (11) of the bell (8) is free and the lower opening (5) of each cavity (2) is free flowing · Device according to claim 1, characterized in that a hollow extension (7) connecting the cavity (2) to the surrounding environment is connected in an airtight manner around the lower opening (5) of the surface-treated cavity (2).