Process for the production of smooth-surfaced parts from a hard

Details Process for the production of smooth-surfaced parts from a hard Process for the production of smooth-surfaced parts from a hard

1987-07-14

1989-04-04

Thurlow, Jeffery

Coating processes

Nonuniform coating

Deforming the base or coating or removing a portion of the...

51317, 51319, 264 77, 264118, 264119, 264125, 264134, 264139, 264151, 264162, 264246, 264341, 264DIG59, 427277, B05D 506, B29C 4320, B29C 5900

Patent

active

048185701

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a process for the production of smooth-surfaced parts from a hard gemlike material in accordance with the preamble of claim 1, and a use of this process.
Hard semiprecious-stonelike materials for use as replacements for semiprecious stones and for the production of gemlike products have been disclosed, for example, by Patent Application DE No. 3,445,189. According to this teaching, a binder is mixed with a filler and a base pigment to a pasty consistency. The pasty material is then divided at least once into pieces, coated with an added pigment and subsequently pressed together. This still pasty material is then hardened, either as such or after a further processing step, such as, for example, calendering or other shaping.
In this process, the disadvantage becomes apparent that the surface of the paste material is completely coated by added pigment since the pieces into which the paste material is divided are always recoated with the added pigment. This also applies to the case where the paste material is employed in the form of processable granules. A decorative structure of the finished product can therefore only be seen after removal of the surface. In order to produce such a decorative, for example marble-like, structure on a shaped finished product, for example a watch casing or a knife handle, a further step, for example erosive polishing, is necessary after shaping in order to remove the added pigment coating from the visible surface of the blank and to give this surface the desired character (for example lustre).
However, such erosive polishing is disadvantageous: on the one hand, such a step makes production more expensive, and on the other hand certain shapes, for example those shapes which have recesses and indentations with inside edges, cannot be polished at all or only at very great expense. In addition, polishing accompanied by erosion is particularly disadvantageous in the case of small precision parts such as watch casings: the ideal material density is in the region of the surface of the blanks on the so-called pressing skin, and the deeper the surface layer of a blank is eroded, the more porous the final part appears. In the case of this type of result, it is often necessary to reseal the surface treated by erosive polishing by repeating the pressing.


SUMMARY OF THE INVENTION

In order to avoid these disadvantages, the invention proceeds from the knowledge that the removal of the surface layer in order to expose the decorative structure of a blank and the production of a smooth surface of the corresponding finished part can be carried out in two separate steps. A consequence of this knowledge is that it can be accepted that the removal of the surface layer does not leave behind a smooth surface of the part, but instead a matt or even rough surface: in a following step, this matt or rough surface can also be smoothed using those processes which do not produce erosion.
In order to achieve this result, a process of the type mentioned initially is characterized by the combination of process steps specified in claim 1. Advantageous improvements of the process and a use of the same can be seen from the dependent claims.
This invention thus provides a process with which smooth-surfaced parts made from a hard gemlike material can be produced continuously on a conveyor belt in an economic fashion.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described below in further detail with reference to the drawings, in which:
FIG. 1 shows a diagram and a device, with reference to which the preparation of the paste material used in the process according to the invention can be described,
FIG. 2 shows a device, with reference to which the process steps leading to the production of a coating on a substrate can be described,
FIG. 3 shows a device, with reference to which further process steps of the process according to the invention can be described,
FIG. 4 shows a device, with reference to which a variant of the process according to the inventi

REFERENCES:
patent: 1935985 (1933-11-01), Oberherr
patent: 2835996 (1958-05-01), De Paoli, Sr.
patent: 3012901 (1961-12-01), Reese
patent: 3194856 (1965-07-01), Palmer
patent: 3359352 (1967-12-01), Powell et al.
patent: 3378617 (1968-04-01), Elmendorf
patent: 3381067 (1968-04-01), Kemmler
patent: 3549398 (1970-12-01), Watson
patent: 3589071 (1971-06-01), Hirschborn
patent: 3882641 (1975-05-01), Montgomery et al.
patent: 3969454 (1976-07-01), Thornber et al.

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