Coating apparatus – Projection or spray type – Inside of hollow work
Patent
1996-01-11
1998-08-11
Edwards, Laura
Coating apparatus
Projection or spray type
Inside of hollow work
118408, 118620, 427230, 427236, 427239, 204224R, 204237, B05C 500
Patent
active
057922659
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device as well as to a process for producing reinforcing layers in particular on cylinder running surfaces of the cylinder bores especially of light metal cylinder blocks and the like in connection with internal combustion engines and the like, by successively introducing treatment and coating baths into the cylinder bores.
2. The Prior Art
Such devices or methods are basically known and used primarily in the manufacture of such internal combustion engines having a cylinder block consisting of light metal, in particular of aluminum or an aluminum alloy.
In this connection, a nickel dispersion layer is produced, as a rule, for increasing the resistance to wear of the cylinder running surfaces.
For producing such dispersion layers, immersion processes are known in which the entire cylinder block is successively placed in different baths by means of suitable manipulators.
Said process is disadvantageous to the extent that when the cylinder block is transferred from one bath into the other, relatively much bath liquor is carried along from the preceding bath. In addition, unnecessarily large surfaces of the workpiece come into contact with the bath liquors.
It is known from DE-OS 39 37 763 to treat only the cylinder running surfaces with the baths by introducing the respective bath liquors into the cylinder bores. For this purpose, the cylinder block is arranged on a sealing plate, which serves as the workpiece carrier, and which is transferred together with the cylinder block between the various treatment positions at the various baths. The sealing plate, which is arranged on the cylinder head side of the cylinder block pointing downwardly during the bath treatment, has openings that are coaxial with the cylinder bores, so that the sealing plate can be lowered together with the cylinder block in the treatment positions onto vertical spraying or flushing tubes, by means of which the respective bath liquor is then flushed into the cylinder bores.
It is made possible in this way that the bath liquors are only admitted to the surfaces of the workpiece that are to be reinforced.
However, all the methods specified above have the drawback that the cycle times for transferring the cylinder block between the individual baths can not be synchronized in a desirable way with the respective bath treatment times. While some bath liquors have to or may act on the cylinder running surfaces only for a short time, other bath liquors have to act for clearly longer time periods. This leads to the fact that the longest treatment time determines the cycle times for transferring the cylinder block from one bath to the next. It has to be accepted in this connection that the cylinder block clearly dwells longer in some baths than would be necessary for the treatment with the respective bath liquor. This, however, is basically undesirable because it means one necessarily has to put up with the fact that individual bath installations are clearly used below their capacity.
A further problem of the processes known heretofore is that particularly with engines with a V-shaped cylinder arrangement. The two cylinder rows, because of the upwardly open process space, have to be vertically aligned one after the other for the coating process, which highly increases the time expenditure.
Additional drawbacks of the upwardly open process space are an increased risk of contamination and the limited possibilities for influencing the flow conditions in an open process space.
SUMMARY OF THE INVENTION
Therefore, an object of the invention is to create a novel device, which permits the bath-technological manufacture of reinforcing layers at comparatively low expenditure and avoids the drawbacks of an upwardly open process space.
According to the invention, the object is achieved wherein the bath liquors are admitted into the cylinder bores by means of flush-in devices. These devices by way of a manifold arrangement, are connectable with a plurality of basins of reservoi
REFERENCES:
patent: 4441976 (1984-04-01), Iemmi et al.
patent: 5271967 (1993-12-01), Kramer et al.
patent: 5468295 (1995-11-01), Marantz et al.
patent: 5580383 (1996-12-01), Ikegaya et al.
Hubner Helmut
Maier Kurt
Pfleiderer Ernst
Edwards Laura
Mahle GmbH
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