Comadur SA

A decorated piece including a substrate ( 1 ) with a surface ( 1 a ) defining a first part with a positive and/or negative relief ( 2 ) relative to the plane of the surface ( 1 a ) and a second part extending in the plane of the surface ( 1 a ), the first or second parts forming a decoration ( 4 ), wherein the first part is formed from the substrate ( 1 ) made of an amorphous zirconium-based metallic alloy and in that the second part is formed from a ceramic layer ( 3 ) deposited on the substrate ( 1 ) or, conversely, in that the first part is formed from the ceramic layer ( 3 ) deposited on the substrate ( 1 ) and in that the second part is formed of the substrate ( 1 ) made of the amorphous zirconium-based metallic alloy. Also, a method for manufacturing the decorated piece.

A grinding tool ( 1 ) including an elongated tool body ( 2 ) including a first end ( 20 ) including a grinding head ( 3 ) with an abrasive plating ( 4 ), and a second end ( 21 ), an axial channel ( 5 ) running through the tool body ( 2 ) from the second end ( 21 ), over a given length of the body, and at least one coolant feed tube arranged with the axial channel ( 5 ) to allow the grinding head ( 3 ) to eject a fluid introduced into the axial channel ( 5 ) at the second end ( 21 ), the grinding head ( 3 ) having a terminal outer surface ( 30 ) bounded by a peripheral outer surface ( 31 ), the terminal outer surface ( 30 ) having at least one groove ( 6 a to 6 f ) running radially from the axial channel ( 5 ) to the peripheral outer surface ( 31 ), the groove being closed off along its length by the abrasive plating ( 4 ) to form the at least one coolant feed tube. The invention also relates to a method for making a galvanised grinding tool.

A method and device for manufacturing a bevelled stone, particularly for a timepiece are disclosed. A precursor is produced from a mixture of at least one material in powder form with a binder. The method includes pressing the precursor so as to form a green body, using a top die and a bottom die comprising a protruding rib, sintering the green body so as to form a body of the future stone in at least one material, the body including a peripheral face and a bottom face provided with a groove, and machining the body including a substep of planning the peripheral face up to the groove, such that an inner wall of the groove forms at least a flared part of the peripheral face of the stone.

A multicoloured ceramic component and its manufacturing method.

A multicolour cermet and/or ceramic article, and in particular a bezel of a timepiece, made by a method for injecting at least two materials of distinct colours, said article comprising a relief decoration of a colour different from the rest of the article, said decoration being made by laser ablation after injection of the two materials.

An external part component ( 10 ) of a watch, of a fashion item or of a jewellery item, including a substrate ( 11 ) made of a transparent material, the substrate ( 11 ) including an upper face ( 110 ) opposite to a lower face ( 111 ), the external part component ( 10 ) including a base layer ( 12 ) deposited over a first portion ( 1101 ) of the upper face ( 110 ) and at least one secondary layer ( 13 ) deposited over the base layer ( 12 ) and over a second portion ( 1102 ) of the upper face ( 110 ), the first and second portions ( 1101, 1102 ) of the upper face ( 110 ) having different surface conditions.

A method for the three-dimensional decoration of a substrate ( 11 ) to produce an external part ( 10 ), which method includes the steps of: depositing an enamel base layer ( 12 ) on an external surface ( 110 ) of a ceramic substrate ( 11 ); firing the substrate ( 11 ) covered with the base layer ( 12 ); etching the base layer ( 12 ) in a predefined decorative pattern to generate one or more blind cavities; depositing a decorative layer ( 13 ) of ceramic material and/or metallic material on the base layer ( 12 ) and the cavities ( 120 ) so as to fill said cavities ( 120 ) in order to form decorative elements ( 130 ); surfacing the decorative layer ( 13 ) to remove said layer deposited on the base layer ( 12 ); and tribofinishing the substrate ( 11 ), the base layer ( 12 ) and the decorative layer ( 13 ) to remove the base layer ( 12 ).

A method for manufacturing an external component of a watch, of a fashion item or of a jewellery item, including depositing an inner layer on all or part of the surface of an inner face of a substrate made of a transparent material, localised ablation of the inner layer, so as to conserve a part of the inner layer on a first portion of the inner face f the substrate, the ablation being performed so as to form at least one pocket opening onto a second portion of the inner face of the substrate and so as to structure the second portion of the inner fa of the substrate, treating the surface of the inner layer and of the second portion of the inner face of the substrate.

A method is for manufacturing a stone, in particular for a timepiece, from a mineral body of monocrystalline or polycrystalline type. The method includes an ablation step in which the body is subjected to a material ablation by scanning on at least one face of the body using ultra-short pulse laser radiation whose duration is less than one hundred picoseconds, and whose beam is guided by a precession system having at least three axes to at least partially cancel the angle of the laser cone, which is due to the focusing of the laser. A mineral stone of monocrystalline or polycrystalline type, in particular for a horological movement, is likely to be obtained by the method. The stone includes in particular a face provided with a peripheral rim, in particular for laterally clamping an endstone in a bearing.

A horology or jewellery component, characterised in that it contains γ phase silicon nitride in a percentage by volume comprised between 99% and 100%.