Method for making an arrangement consisting of a cast part and a cast-in component

Abstract

A method for making an arrangement consisting of a cast part and a cast-in component composed of a metallic material. The cast-in component is composed of a metallic material that has a galvanically applied nickel layer. The layer is applied by positioning the cast-in component in an electrolyte bath and applying the coating on at least part of the surface of the component. The cast-in component is then positioned in a casting mold and a cast part is casted around the cast-in part.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a divisional of U.S. patent application Ser. No. 13 / 325,521, filed on Dec. 14, 2011, which claims priority under 35 U.S.C. §119 of German Application No. 10 2010 055 162.7 filed on Dec. 18, 2010, the disclosures of which are incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a method of making an arrangement consisting of a cast part and a cast-in component having a coating composed of a metallic coating material.[0003]In machine construction, in particular, components frequently have to be provided with a coating that can fulfill various tasks, for example as a tribological coating or as a connection layer between two components. An example is the production of cast parts composed of metals or metal alloys, in which other components, namely cast-in components, composed of a metallic material that differs from that of the cast part, are cast in. This relates, for example, to cast parts comp...

AI Technical Summary

Benefits of technology

[0014]A layer thickness of 3 μm to 80 μm has proven to be practical. Layer thicknesses of 5 μm to 50 μm are preferred, with which a satisfactory balance between good shear strength and low material consumption is achieved. A layer thickness of 15 μm is particularly preferred.

[0015]Depending on the area of application, the coating according to the invention can furthermore contain solids dispersed in it, such as, for example, reinforcement fibers composed of metal or plastic or pyrogenic silicas. In this way, the stability of the coating according to the invention can be further increased. Finally, a thin copper layer can also be galvanically deposited between the surface of the cast-in component and the coating according to the invention.

Problems solved by technology

However, the materials used for the cast-in component and the cast part, respectively, are generally incompatible and do not form a firm bond with one another.

Thermally spray-coated layers are furthermore generally not free of embedded oxides and porosities.

There is therefore the risk that the thermally spray-coated layer tears off under great stress.

Because of the great investment requirement for thermal spray-coating and process monitoring, thermally spray-coated layers represent a cost-intensive solution.

However, these coatings are not reliably suited for cast-in components, because the layer can come loose from the cast-in component during the casting-in process, on the basis of the thermal expansion of the zinc, and furthermore, it is weakened at the boundary region to the cast-in material, by means of a pore seam composed of Kirkendall pores.