WO2022090890A1 - Hollow metal wire with multiple metal components, particularly for goldsmithing, silversmithing and custode jewellery, and its implementation process - Google Patents

Hollow metal wire with multiple metal components, particularly for goldsmithing, silversmithing and custode jewellery, and its implementation process Download PDF

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Publication number
WO2022090890A1
WO2022090890A1 PCT/IB2021/059817 IB2021059817W WO2022090890A1 WO 2022090890 A1 WO2022090890 A1 WO 2022090890A1 IB 2021059817 W IB2021059817 W IB 2021059817W WO 2022090890 A1 WO2022090890 A1 WO 2022090890A1
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WO
WIPO (PCT)
Prior art keywords
layer
metal
laminar element
laminar
wire
Prior art date
Application number
PCT/IB2021/059817
Other languages
French (fr)
Inventor
Alfredo Del Pia
Stefano Del Pia
Giorgio Del Pia
Original Assignee
Del Pia Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Del Pia Srl filed Critical Del Pia Srl
Publication of WO2022090890A1 publication Critical patent/WO2022090890A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21L—MAKING METAL CHAINS
    • B21L11/00—Making chains or chain links of special shape
    • B21L11/005—Making ornamental chains
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A44C27/003—Metallic alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/042—Manufacture of coated wire or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/045—Manufacture of wire or bars with particular section or properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/102—Making tubes with riveted seams or with non-welded and non-soldered seams of coated strip material (making multi-wall tubes)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/108—Making tubes with riveted seams or with non-welded and non-soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D49/00—Sheathing or stiffening objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/44—Making other particular articles fancy goods, e.g. jewellery products

Definitions

  • This invention relates to a hollow metal wire made of several metal components, in particular of gold-based alloy and silver, and its production process.
  • Silver even though it is considered to be a noble metal, becomes opaque over time and tends to form an oxide which darkens it.
  • These metal wires are made from an outer metal sheet and an inner metal sheet, which are first plated together and then bent to form tubular elements.
  • the outer sheet made of gold-based alloy is generally made of a gold alloy with a different carat weight, for example 14 or 18 carats, that is to say, an alloy which, in the first case, has 585 milligrams of pure (or fine) gold on a gram of total alloy, in the second case the fine gold will, on the other hand, be 750 milligrams.
  • alloying metals usually copper, silver and palladium.
  • the inner sheet made of silver alloy is, on the other hand, a alloy made of silver and copper which normally has at least 925 milligrams of pure silver for each gram of total alloy.
  • Said tubular element is then extruded until obtaining a wire, with a desired diameter, having an outer coating made of auriferous alloy and an inner core made of silver.
  • the aim of the invention is to overcome the above-mentioned drawbacks of prior art processes for making a metal wire with two components, in particular of gold-based alloy and silver, which allows a wire to be made which has a covering of gold-based alloy on a silver matrix which is resistant to wear over time and oxidisation.
  • an aim of the process, according to the invention is to make a metal wire with two components, in particular of gold-based alloy and silver, which allows the wire to undergo any type of machining, even striking with solid tools.
  • Another aim of the invention is to allow the metal wire made with two components, in particular of gold-based alloy and silver, to be machined without the risk of separating the gold-silver interface, avoiding unattractive bubbles, scoring, powdering, scratches and any other type of surface imperfections.
  • Yet another aim of the invention is to implement a process for making a metal wire with two components, in particular made of an gold-based alloy and silver which is economically competitive.
  • Figure 1 shows a cross-section of the wire 1 , substantially normal with respect to its axis of extension 10;
  • Figure 2 schematically illustrates the drawing of the sheet-like element 103
  • Figure 3 schematically illustrates the formation of the plate 104 made with two metal components
  • Figure 4 schematically illustrates the plate 104 after having undergone the so-called “Turks’ head” mechanical processing
  • Figure 5 is a cross-section of the cylindrical support 105
  • Figure 6 shows a step of winding the plate 104 around the cylindrical support 105
  • Figure 7 is a cross-section of the cylindrical body 106 substantially normal with respect to the axis of extension 110 of the cylindrical support 105;
  • Figure 8 schematically illustrates the formation of the plate 204 made with two metal components (201 and 202);
  • Figure 9 shows a cross-section of the cylindrical body 206 substantially normal with respect to the axis of extension 210 of the cylindrical support 205;
  • Figure 10 schematically illustrates the sequence of steps for making the metal wire 31 ;
  • Figure 11 schematically illustrates the sequence of steps for making the metal wire 41 .
  • FIG. 1 shows a preferred embodiment of a hollow metal wire (or a similar tubular element) with several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, according to the invention, which is identified in its entirety with the reference numeral 1 which extends along a direction of extension 10 and which comprises at least two layers substantially separate from each other from the metallographic point of view: a first layer 11 consisting of a first metal, for example a silver alloy, and a second layer 12 consisting of a metal, for example a gold alloy.
  • the second layer 12 is for containing at least one portion 15 of the first layer 11 .
  • the first layer 11 has a relative face in contact with a face of the second layer 12, associated with it in a substantially irremovable manner without mutual interconnection means between the two layers, and hence without, for example, welds.
  • the layers 11 , 12 and, if necessary, a third layer 13 are integrally associated with each other in a substantially irremovable manner and without mutually interconnecting means.
  • the layers 11 and 12 are clearly separated from the metallographic point of view and there is therefore no penetration at a molecular level between the two metals making up them.
  • the portion 15 is only the apical one of the first layer 11 , so that its outermost face rests on the innermost face of said second layer 12.
  • the portion 15 of the innermost face of the first layer 11 is in contact with at least one portion 12' of the innermost face of the second layer 12.
  • the wire 1 comprises two layers made of precious metal: a first inner layer 11 , for example made of silver, and a second outer layer 12, for example made of a gold alloy, where "inner” and “outer” refer to the axis of extension 10 and the layer closest to the axis 10 will therefore be the “inner” layer, whilst the layer furthest from the axis will be “outer” layer.
  • the inner layer 11 acts as a support for the outer layer 12.
  • the two layers 11 and 12 form an open line, substantially C- shaped, since they have a slot 16 giving access to the compartment inside the wire 1 , defined along the axis of extension 10.
  • the second layer 12 comprises at least one curved end portion 14, which extends along the axis 10 and is designed to house the apical portion 15 of the second layer 14.
  • the outer layer 12 has two curved end portions 14, formed in a position substantially symmetrical with respect to said access slot 16, for housing two edges 15 of said second layer 14: according to this configuration, the grip between the two layers 11 and 12 is advantageously improved.
  • the two curved end portions of the wire 21 are defined in the second layer, in this case inner, made of silver.
  • these curved portions are suitable for housing the edges of the first layer, this time outside, made of gold alloy.
  • both the wire 1 and the variant just described 21 will have on the outside a layer of gold alloy on a support made of silver.
  • the process for making the hollow metal wire 1 (or other similar tubular element) made of several metal components comprises the steps which consist firstly in the coupling of at least two laminar elements: a first laminar element 101 made of a first metal, for example silver, to a second laminar element 102 made of a second metal, for example a gold alloy.
  • the coupling must be performed in such a way that a face of the first element 101 is in contact with a face of the second element 102, so as to form a sheet-like element 103 made with two metal components.
  • the thickness of the first element 101 is much thinner than the thickness of the second element 102, made of gold alloy.
  • the first laminar element 101 has a width L greater than the width I of the second laminar element 102 ( Figure 2).
  • the sheet-like element 103 is then drawn in to obtain a plate 104 made of two metal components ( Figure 3).
  • X% is in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26%, including the limits, even more preferably between 23% and 25%, including the limits.
  • the length of the first laminar element 101 is:
  • the above-mentioned plate 104 is then wound around a cylindrical support 105.
  • the element 105 is made of material designed to be eliminated in a subsequent step, for example a copper alloy ("Tombak") which can be eliminated by acid emptying, in such a way as to obtain a tubular body 107 which therefore has at least three components: an outermost layer of gold alloy, formed by the second laminar element 102, a middle layer of silver formed by the first laminar element 101 and a core consisting of the cylindrical support 105.
  • Tombak copper alloy
  • cylinder is used to mean any basic geometrical surface which is generated by rotating through 360° a surface of any shape around one of its sides, as the solid limited by this surface must also be understood.
  • the cylindrical support 105 does not necessarily have a circular base and, obviously, its cross section of the element determines the shape of the wire 1 . Therefore, in order to obtain wire 1 with a circular cross-section, the body 105 must have a circular crosssection, if, on the other hand, a wire 1 with an elliptic or square or rectangular cross-section is made, the cross-section of the cylindrical support 105 must necessarily also be elliptic, square or rectangular.
  • the cylindrical support 105 has at least one compartment 106 formed along its direction of extension 110 ( Figure 5), during winding of the plate 104, at least one edge of the second laminar element 102 curves on itself, capturing a part of the corresponding edge of the second layer 14 and thus remaining inside the compartment 106.
  • the cylindrical support advantageously has two compartments 106 which are substantially symmetrical with respect to the direction of extension 110.
  • Each of the two compartments 106 houses the edges of the first 101 and of the second 102 laminar element so that, during winding of the plate 104, the two edges of the second laminar element 102 are curved on themselves, capturing a part of the edges of the first laminar element 101 .
  • the compartment 106 is therefore for housing the respective edges of the laminar elements 101 and 102.
  • the cylindrical support 105 is eliminated, giving rise to the hollow metal wire 1 (or similar tubular element) which will have an outer layer 12 made of gold alloy and an inner layer 11 made of silver.
  • the elements 101 and 102 constitute, respectively, the layers 11 and 12, whilst the space between the compartments 106 will form the slot 16 of the wire 1 just described above.
  • the second laminar element 202 is made of gold alloy whilst the first laminar element 201 is made of silver (Figure 8).
  • the process always remains the same with the plate 204 at the outfeed of the extruder with the excess portions of the first element 201 always superposed on the face of the second laminar element 202 due to the fact that the width L of the element 201 is greater than the width I of the element 202 always in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26% including the limits, and even more preferably between 23% and 25%, including the limits.
  • tubular body 207 with an outer layer formed by the element 201 , made of gold alloy;
  • the outer and intermediate layers are secured to each other thanks to the machining stresses and to the curved end portions of the second element 202 (substantially symmetrical with respect to the axis of extension 210 of the body 205) which capture and trap the first element 201 , formed with the winding action on the compartments 206 formed in the cylindrical body 205.
  • a step of preparing the plate 104 for the winding which comprises a mechanical processing at the “Turks’ head”, that is to say, a tool which allows slabs with a square or rectangular cross-section to be drawn, in such a way as to incline the peripheral portions of the plate 104 by a substantially right angle, so as to obtain a shape of the plate 104 practically in the shape of a "U” ( Figure 4).
  • the tubular body 107 Before eliminating the cylindrical support 105, the tubular body 107 is advantageously subjected to all the machining operations necessary.
  • the resistance is such that it can be reduced to links for chains of goldsmith’s, silversmith's or costume jewellery items.
  • the elimination of the cylindrical support 105 made of copper alloy (Tombak) can be performed by acid emptying by using the access slot 16, so that the metal attacked by the emptying acid is then discharged towards the outside by means of the slot 16 which forms during the acid emptying with the disappearance of the copper alloy in the space defined between the two compartments 106, along the axis of extension 10 of the wire 1 .
  • the first layer 11 is for supporting at least a third layer 13, so that the wire 31 consists of the first, the second or a third metal, so that the outermost face of the third layer 13 is in contact with at least one portion of the innermost face of the first layer 11.
  • the third metal is the same metal as the first layer 11 , for example silver, whilst the second layer 12, made of gold, remains outside.
  • the operator has more margin for calibrating the final strength of the precious metal wire 31 .
  • the second laminar element 203 is made by coupling at least two laminar elements, a primary laminar element 301 of a first metal, for example silver, to a secondary laminar element 302 of the same metal, again silver (or also a second metal in other applications).
  • a face of the primary laminar element 301 comes into contact with a face of the secondary laminar element 302, so as to form a sheet-like element 303.
  • the primary laminar element 301 must have a width which is greater than the width of the secondary laminar element 302 in such a way as to be able to contain it (at least partly).
  • the second layer 12 of a wire 41 contains the entire first layer 11 : in practice, the layer 12 made of gold, totally contains the first layer 11 , in the case in question made of silver, and therefore the layer 12 has a double inner supporting surface for the outermost face and the innermost face of the first layer 11 .
  • the wire 41 has three (or more) steps, with a first outermost layer made of a first metal, a second intermediate layer made of a second metal and a core made of a third metal.
  • the process for making the hollow metal wire 41 made with two components, in particular gold and silver comprises, on the other hand, the following steps.
  • Two elongate elements are coupled: a first element 40T made of a first metal, silver, to a second element 401", necessarily tubular, of a second metal, gold, in such a way that the outermost face of the first element 40T is in contact with the innermost face of the second element 401 ", so as to form an elongate body 402, internally made of silver and externally made of gold (Figure 11 ).
  • the elongate body 402 thus obtained is flattened, until having a sheet-like element 403 with at least two gold and silver metal components.
  • a plate 404 which is also made with at least two gold and silver metal components.
  • the plate 404 is therefore wound around a cylindrical support 405 made of copper (Tombak) or another material designed to be eliminated in a subsequent step, in such a way as to obtain a tubular body which has at least three components (gold, silver and copper).
  • the cylindrical support 405 also has, along its direction of extension 410, two compartments 406 positioned symmetrically with respect to an axis normal to the direction 410.
  • the two compartments 406 are designed to house the edges of the elongate elements 40T and 401" when they are flattened. In this way, during winding of the plate 404, the edge of the second tubular element 401", which is flattened, is curved on itself, capturing a part of the edge of the first flattened laminar element 40T and they thus remain inside the compartment 406.
  • a single compartment is made on which both edges of the elongate elements 40T and 401" converge when they are flattened and which, substantially, will be next to each other in that configuration.
  • the cylindrical support 405 is eliminated with acid emptying, thanks to the slot 16, formed along the axis of extension 10, giving access to the inner compartment of the hollow metal wire 41 with several metal components (gold-silver) thus formed.
  • three elongate elements are coupled: a first solid element (not tubular) of a first metal, a second tubular element of a second metal and, on the latter, a third tubular element of a third metal, in such a way that the outermost face of the first element is in contact with the innermost face of the second element, and the outermost face of the second tubular element is in contact with the innermost face of the third tubular element, so as to form an elongate body with three components.
  • the wire 41 therefore has at least two layers 11 and 12, respectively silver and gold, separated from each other from the metallographic point of view, mutually associated in an irremovable fashion without mutually interconnecting means (welding), wherein the layer of gold 12, being for containment of the entire first layer 11 , is the only one to be in contact with the cylindrical support 405, thus preserving the silver of the layer 11 .
  • the gold layer 12 advantageously acts as a protective film for the silver core 11 which is not wetted by the acid which attacks the copper.
  • a problem connected with the emptying of the copper is that due to the ionic charge of the acid solution, used to dissolve the copper, it is very difficult to preserve both the silver and the gold, thus causing all the problems resulting from an acid action and affecting the silver.
  • the first element 401 ' made of silver is advantageously solid, that is to say, not hollow or tubular, in such a way as to give to the elongate body 402 (gold and silver), a quantity of silver such as to comply with a predetermined proportion between the two metals.
  • the layers 11 and 12 (and 13) form an open line with a slot 16 giving access to the compartment inside the wire 1 , 21 , 31 or 41.
  • This open line is defined along the axis of extension 10.
  • the second layer 12 comprises at least one curved end portion 14, extending along the axis 10 and for housing the portion 15.
  • the invention achieves the purpose and aims and in particular the fact that a hollow metal wire, or a similar tubular element, is made, with several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, and a relative production process, which allows a hollow metal wire to be obtained which has a covering made of gold-based alloy on a silver matrix without welds or plating and which is therefore more resistant to wear than the prior art wires with two phases.
  • An advantage of the process according to the invention is to allow the production of a hollow metal wire or another similar tubular element made of two components which, before being emptied, has undergone every type of machining, even a striking with solid tools or which has been reduced (or can be reduced) into links.
  • Another advantage of the invention is to allow the processing of the hollow metal wire or similar tubular element, made of two or more components, in particular of gold-based alloy and silver, without the risk of separating the gold-silver interface, without imperfections and unattractive surface defects.
  • the materials used, as well as the dimensions may be of any type, depending on requirements, provided that they are consistent with their production purposes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Adornments (AREA)

Abstract

Described is a hollow metal wire (1, 21, 31, 41) made of several metal components, in particular for goldsmith's, silversmith's and costume jewellery products, which extends along a direction of extension (10) and which comprises at least two layers (11, 12, 13) substantially separate from each other from the metallographic point of view: a first layer (11) consisting of a first metal and a second layer (12) consisting of a second metal, for containing at least a portion (15) of the first layer (11).

Description

HOLLOW METAL WIRE WITH MULTIPLE METAL COMPONENTS, PARTICULARLY FOR GOLDSIMTHING, SILVERSMITHING AND CUSTODE JEWELLERY, AND ITS IMPLEMENTATION PROCESS DESCRIPTION
Technical field
This invention relates to a hollow metal wire made of several metal components, in particular of gold-based alloy and silver, and its production process.
Background art
The exponential increase in the price of gold as a raw material, as well as the recent economic and financial crises at a global level, have led to a significant reduction in the demand for jewellery made of gold and its alloys.
For the same reasons, on the other hand, the demand for silversmith's or costume jewellery articles, which are less expensive and more versatile, has undergone a strong increase.
However, these types of products almost never reach the aesthetic quality of jewellery made of gold, palladium or other precious metals due to the sheen and oxidation resistance.
Silver, even though it is considered to be a noble metal, becomes opaque over time and tends to form an oxide which darkens it.
The need is therefore increasingly felt by consumers to be able to find objects on the market which combine more accessible prices with the relative aesthetic quality of pieces of jewellery made of gold.
There are prior art metal wires comprising a thin outer coating made of gold-based alloy and an inner core made of a silver alloy which has a support function.
These metal wires are made from an outer metal sheet and an inner metal sheet, which are first plated together and then bent to form tubular elements.
The outer sheet made of gold-based alloy is generally made of a gold alloy with a different carat weight, for example 14 or 18 carats, that is to say, an alloy which, in the first case, has 585 milligrams of pure (or fine) gold on a gram of total alloy, in the second case the fine gold will, on the other hand, be 750 milligrams.
This means that they are present in alloying metals, usually copper, silver and palladium.
The inner sheet made of silver alloy, with a greater thickness, is, on the other hand, a alloy made of silver and copper which normally has at least 925 milligrams of pure silver for each gram of total alloy.
After bending the two plated plates, there will be a tubular element with an outer thickness of gold alloy on a matrix substantially made of silver.
Said tubular element is then extruded until obtaining a wire, with a desired diameter, having an outer coating made of auriferous alloy and an inner core made of silver.
However, this process leads to the production of a wire which has a metalmetal interface which can be easily penetrated by oxidising agents and which can therefore lead to a actual scaling of the gold alloy coating.
Moreover, many processing operations are not allowed on this type of wire which will or can ruin the metal due to the fact that the inner core made of silver does not have an optimum resistant section for some mechanical tools or these processes may result in the separation of the above- mentioned interface, creating, for example, surface bubbles or unattractive markings.
Detailed description
The aim of the invention is to overcome the above-mentioned drawbacks of prior art processes for making a metal wire with two components, in particular of gold-based alloy and silver, which allows a wire to be made which has a covering of gold-based alloy on a silver matrix which is resistant to wear over time and oxidisation.
In the context of the above-mentioned purpose, an aim of the process, according to the invention, is to make a metal wire with two components, in particular of gold-based alloy and silver, which allows the wire to undergo any type of machining, even striking with solid tools.
Another aim of the invention is to allow the metal wire made with two components, in particular of gold-based alloy and silver, to be machined without the risk of separating the gold-silver interface, avoiding unattractive bubbles, scoring, powdering, scratches and any other type of surface imperfections.
Yet another aim of the invention is to implement a process for making a metal wire with two components, in particular made of an gold-based alloy and silver which is economically competitive.
This purpose, as well as these and other aims, which are described in more detail below, are achieved by a hollow metal wire made of several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, according to the invention, comprising the technical features described in one or more of the appended claims.
The dependent claims correspond to possible different embodiments of the invention.
Description of the drawings
Further features and advantages of the invention will become more apparent from the description of a preferred but non-exclusive embodiment of the hollow metal wire made with several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, and its production process illustrated by way of example and without limiting the scope of the invention in the accompanying drawings, in which:
Figure 1 shows a cross-section of the wire 1 , substantially normal with respect to its axis of extension 10;
Figure 2 schematically illustrates the drawing of the sheet-like element 103;
Figure 3 schematically illustrates the formation of the plate 104 made with two metal components; Figure 4 schematically illustrates the plate 104 after having undergone the so-called “Turks’ head” mechanical processing;
Figure 5 is a cross-section of the cylindrical support 105;
Figure 6 shows a step of winding the plate 104 around the cylindrical support 105;
Figure 7 is a cross-section of the cylindrical body 106 substantially normal with respect to the axis of extension 110 of the cylindrical support 105;
Figure 8 schematically illustrates the formation of the plate 204 made with two metal components (201 and 202);
Figure 9 shows a cross-section of the cylindrical body 206 substantially normal with respect to the axis of extension 210 of the cylindrical support 205;
Figure 10 schematically illustrates the sequence of steps for making the metal wire 31 ;
Figure 11 schematically illustrates the sequence of steps for making the metal wire 41 .
Detailed description of the invention
The above-mentioned drawings show a preferred embodiment of a hollow metal wire (or a similar tubular element) with several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, according to the invention, which is identified in its entirety with the reference numeral 1 which extends along a direction of extension 10 and which comprises at least two layers substantially separate from each other from the metallographic point of view: a first layer 11 consisting of a first metal, for example a silver alloy, and a second layer 12 consisting of a metal, for example a gold alloy. The second layer 12 is for containing at least one portion 15 of the first layer 11 .
Preferably, the first layer 11 has a relative face in contact with a face of the second layer 12, associated with it in a substantially irremovable manner without mutual interconnection means between the two layers, and hence without, for example, welds. In practice, the layers 11 , 12 and, if necessary, a third layer 13 are integrally associated with each other in a substantially irremovable manner and without mutually interconnecting means.
The layers 11 and 12 are clearly separated from the metallographic point of view and there is therefore no penetration at a molecular level between the two metals making up them.
Advantageously, the portion 15 is only the apical one of the first layer 11 , so that its outermost face rests on the innermost face of said second layer 12. In this case, the portion 15 of the innermost face of the first layer 11 is in contact with at least one portion 12' of the innermost face of the second layer 12.
With reference to Figure 1 , the wire 1 comprises two layers made of precious metal: a first inner layer 11 , for example made of silver, and a second outer layer 12, for example made of a gold alloy, where "inner" and "outer" refer to the axis of extension 10 and the layer closest to the axis 10 will therefore be the “inner” layer, whilst the layer furthest from the axis will be “outer” layer.
Advantageously, the inner layer 11 acts as a support for the outer layer 12.
Preferably, the two layers 11 and 12 form an open line, substantially C- shaped, since they have a slot 16 giving access to the compartment inside the wire 1 , defined along the axis of extension 10. The second layer 12 comprises at least one curved end portion 14, which extends along the axis 10 and is designed to house the apical portion 15 of the second layer 14.
As shown in Figure 1 , the outer layer 12 has two curved end portions 14, formed in a position substantially symmetrical with respect to said access slot 16, for housing two edges 15 of said second layer 14: according to this configuration, the grip between the two layers 11 and 12 is advantageously improved.
According to a variant embodiment, the two curved end portions of the wire 21 are defined in the second layer, in this case inner, made of silver. For this reason, according to this configuration, these curved portions are suitable for housing the edges of the first layer, this time outside, made of gold alloy.
In any case, both the wire 1 and the variant just described 21 will have on the outside a layer of gold alloy on a support made of silver.
The process for making the hollow metal wire 1 (or other similar tubular element) made of several metal components comprises the steps which consist firstly in the coupling of at least two laminar elements: a first laminar element 101 made of a first metal, for example silver, to a second laminar element 102 made of a second metal, for example a gold alloy. The coupling must be performed in such a way that a face of the first element 101 is in contact with a face of the second element 102, so as to form a sheet-like element 103 made with two metal components.
Preferably, the thickness of the first element 101 , made of silver, is much thinner than the thickness of the second element 102, made of gold alloy.
In this regard, the first laminar element 101 has a width L greater than the width I of the second laminar element 102 (Figure 2).
The sheet-like element 103 is then drawn in to obtain a plate 104 made of two metal components (Figure 3).
The drawing by extrusion means that the plate 104 is present at the outfeed of the extruder 120 with the excess portions of the first element 101 superposed on a face of the second laminar element 102, precisely on account of the difference in size between the two elements (Figure 2). The internal stresses which are formed allow the two laminar elements 101 and 102 to be mutually associated.
In particular, this difference is such that the width L will be greater than the width I in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26%, including the limits, even more preferably between 23% and 25%, including the limits: L = I +X%
Where:
X% is in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26%, including the limits, even more preferably between 23% and 25%, including the limits.
For example, if the length of the first laminar element 101 is:
I = 17.5 mm then the length of the second laminar element 102 will be:
L = 17.5 mm + 24% « 23 mm
The above-mentioned plate 104 is then wound around a cylindrical support 105.
The element 105 is made of material designed to be eliminated in a subsequent step, for example a copper alloy ("Tombak") which can be eliminated by acid emptying, in such a way as to obtain a tubular body 107 which therefore has at least three components: an outermost layer of gold alloy, formed by the second laminar element 102, a middle layer of silver formed by the first laminar element 101 and a core consisting of the cylindrical support 105.
The term "cylinder" is used to mean any basic geometrical surface which is generated by rotating through 360° a surface of any shape around one of its sides, as the solid limited by this surface must also be understood.
As mentioned above, the cylindrical support 105 does not necessarily have a circular base and, obviously, its cross section of the element determines the shape of the wire 1 . Therefore, in order to obtain wire 1 with a circular cross-section, the body 105 must have a circular crosssection, if, on the other hand, a wire 1 with an elliptic or square or rectangular cross-section is made, the cross-section of the cylindrical support 105 must necessarily also be elliptic, square or rectangular.
Since the cylindrical support 105 has at least one compartment 106 formed along its direction of extension 110 (Figure 5), during winding of the plate 104, at least one edge of the second laminar element 102 curves on itself, capturing a part of the corresponding edge of the second layer 14 and thus remaining inside the compartment 106.
As shown in Figures 5, 6 and 7, the cylindrical support advantageously has two compartments 106 which are substantially symmetrical with respect to the direction of extension 110. Each of the two compartments 106 houses the edges of the first 101 and of the second 102 laminar element so that, during winding of the plate 104, the two edges of the second laminar element 102 are curved on themselves, capturing a part of the edges of the first laminar element 101 .
The internal tensions, in the interface between the first 101 and the second 102 laminar element which originate from the mechanical processing, allow a welding and joining of the two metallic layers made of gold-based alloy and silver.
When wound, the ends of the elements 101 and 102 entering into the compartments 106 deform mechanically: the element 102 bends “capturing" and trapping the edges of the element 101 (Figures 6 and 7).
This join does not have a molecular passage between the two metals and the layers which are formed, so they remain clearly separate from the metallographic point of view.
The compartment 106 is therefore for housing the respective edges of the laminar elements 101 and 102.
Lastly, the cylindrical support 105 is eliminated, giving rise to the hollow metal wire 1 (or similar tubular element) which will have an outer layer 12 made of gold alloy and an inner layer 11 made of silver.
In practice, according to this configuration, the elements 101 and 102 constitute, respectively, the layers 11 and 12, whilst the space between the compartments 106 will form the slot 16 of the wire 1 just described above.
According to an alternative embodiment, which gives rise to the wire 21 , the second laminar element 202 is made of gold alloy whilst the first laminar element 201 is made of silver (Figure 8). In this case, the process always remains the same with the plate 204 at the outfeed of the extruder with the excess portions of the first element 201 always superposed on the face of the second laminar element 202 due to the fact that the width L of the element 201 is greater than the width I of the element 202 always in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26% including the limits, and even more preferably between 23% and 25%, including the limits.
With particular reference to Figure 9, the result will be to have:
- a tubular body 207 with an outer layer formed by the element 201 , made of gold alloy;
- an intermediate layer comprising the element 202, made of silver;
- an inner layer consisting of the cylindrical support 205 made of copper alloy (Tombak) designed to be emptied with acid solution.
The outer and intermediate layers are secured to each other thanks to the machining stresses and to the curved end portions of the second element 202 (substantially symmetrical with respect to the axis of extension 210 of the body 205) which capture and trap the first element 201 , formed with the winding action on the compartments 206 formed in the cylindrical body 205.
Advantageously, there is a step of preparing the plate 104 for the winding which comprises a mechanical processing at the “Turks’ head”, that is to say, a tool which allows slabs with a square or rectangular cross-section to be drawn, in such a way as to incline the peripheral portions of the plate 104 by a substantially right angle, so as to obtain a shape of the plate 104 practically in the shape of a "U" (Figure 4).
Before eliminating the cylindrical support 105, the tubular body 107 is advantageously subjected to all the machining operations necessary. The resistance is such that it can be reduced to links for chains of goldsmith’s, silversmith's or costume jewellery items. The elimination of the cylindrical support 105 made of copper alloy (Tombak) can be performed by acid emptying by using the access slot 16, so that the metal attacked by the emptying acid is then discharged towards the outside by means of the slot 16 which forms during the acid emptying with the disappearance of the copper alloy in the space defined between the two compartments 106, along the axis of extension 10 of the wire 1 .
In the wire 31 of Figure 10, on the other hand, the first layer 11 is for supporting at least a third layer 13, so that the wire 31 consists of the first, the second or a third metal, so that the outermost face of the third layer 13 is in contact with at least one portion of the innermost face of the first layer 11.
According to the preferred embodiment, the third metal is the same metal as the first layer 11 , for example silver, whilst the second layer 12, made of gold, remains outside.
In this way, advantageously, the operator has more margin for calibrating the final strength of the precious metal wire 31 .
In order to make the wire 31 , a process is applied which is identical to that just described to obtain the wire 1 .
In this case, however, as schematically shown in Figure 10, the second laminar element 203 is made by coupling at least two laminar elements, a primary laminar element 301 of a first metal, for example silver, to a secondary laminar element 302 of the same metal, again silver (or also a second metal in other applications). In this manner, a face of the primary laminar element 301 comes into contact with a face of the secondary laminar element 302, so as to form a sheet-like element 303.
Obviously, similarly to what is described above, the primary laminar element 301 must have a width which is greater than the width of the secondary laminar element 302 in such a way as to be able to contain it (at least partly).
After obtaining the sheet-like element 303, it must be drawn in order to have the second laminar element 203 to be coupled to the first laminar element 202 in the manner already seen for the production of the wire 1 . According to another variant embodiment, the second layer 12 of a wire 41 contains the entire first layer 11 : in practice, the layer 12 made of gold, totally contains the first layer 11 , in the case in question made of silver, and therefore the layer 12 has a double inner supporting surface for the outermost face and the innermost face of the first layer 11 .
Obviously, according to a variant embodiment, the wire 41 has three (or more) steps, with a first outermost layer made of a first metal, a second intermediate layer made of a second metal and a core made of a third metal.
The process for making the hollow metal wire 41 made with two components, in particular gold and silver comprises, on the other hand, the following steps.
Two elongate elements are coupled: a first element 40T made of a first metal, silver, to a second element 401", necessarily tubular, of a second metal, gold, in such a way that the outermost face of the first element 40T is in contact with the innermost face of the second element 401 ", so as to form an elongate body 402, internally made of silver and externally made of gold (Figure 11 ).
The elongate body 402 thus obtained is flattened, until having a sheet-like element 403 with at least two gold and silver metal components.
Subsequently, it is drawn in order to obtain a plate 404 which is also made with at least two gold and silver metal components.
The plate 404 is therefore wound around a cylindrical support 405 made of copper (Tombak) or another material designed to be eliminated in a subsequent step, in such a way as to obtain a tubular body which has at least three components (gold, silver and copper).
The cylindrical support 405 also has, along its direction of extension 410, two compartments 406 positioned symmetrically with respect to an axis normal to the direction 410. The two compartments 406 are designed to house the edges of the elongate elements 40T and 401" when they are flattened. In this way, during winding of the plate 404, the edge of the second tubular element 401", which is flattened, is curved on itself, capturing a part of the edge of the first flattened laminar element 40T and they thus remain inside the compartment 406.
Alternatively, a single compartment is made on which both edges of the elongate elements 40T and 401" converge when they are flattened and which, substantially, will be next to each other in that configuration.
Subsequently, the cylindrical support 405 is eliminated with acid emptying, thanks to the slot 16, formed along the axis of extension 10, giving access to the inner compartment of the hollow metal wire 41 with several metal components (gold-silver) thus formed.
In order to make a wire 41 with three components, three elongate elements are coupled: a first solid element (not tubular) of a first metal, a second tubular element of a second metal and, on the latter, a third tubular element of a third metal, in such a way that the outermost face of the first element is in contact with the innermost face of the second element, and the outermost face of the second tubular element is in contact with the innermost face of the third tubular element, so as to form an elongate body with three components.
The following process is identical to that just described for making a wire 41 with two metal components.
With reference to Figure 11 , the wire 41 therefore has at least two layers 11 and 12, respectively silver and gold, separated from each other from the metallographic point of view, mutually associated in an irremovable fashion without mutually interconnecting means (welding), wherein the layer of gold 12, being for containment of the entire first layer 11 , is the only one to be in contact with the cylindrical support 405, thus preserving the silver of the layer 11 .
In this way, the gold layer 12 advantageously acts as a protective film for the silver core 11 which is not wetted by the acid which attacks the copper. In fact, a problem connected with the emptying of the copper is that due to the ionic charge of the acid solution, used to dissolve the copper, it is very difficult to preserve both the silver and the gold, thus causing all the problems resulting from an acid action and affecting the silver.
For this reason, the intuition of the Applicant who has perceived the protection of one of the two metals, in this case the silver (which remains inside the wire 41 for aesthetic and commercial reasons), reduces an emptying of the wire 41 with two or more components, that is, to an emptying with several metal/acid interfaces (gold/acid and silver/acid), to the classic emptying of a piece with a single metal/acid interface (gold/acid).
Moreover, the first element 401 ' made of silver is advantageously solid, that is to say, not hollow or tubular, in such a way as to give to the elongate body 402 (gold and silver), a quantity of silver such as to comply with a predetermined proportion between the two metals.
Advantageously, according to all the different embodiments of the wire 1 , 21 , 31 and 41 , the layers 11 and 12 (and 13) form an open line with a slot 16 giving access to the compartment inside the wire 1 , 21 , 31 or 41. This open line is defined along the axis of extension 10. Moreover, the second layer 12 comprises at least one curved end portion 14, extending along the axis 10 and for housing the portion 15.
From the above description it may be seen how the invention achieves the purpose and aims and in particular the fact that a hollow metal wire, or a similar tubular element, is made, with several metal components, particularly for goldsmith's, silversmith's and costume jewellery products, and a relative production process, which allows a hollow metal wire to be obtained which has a covering made of gold-based alloy on a silver matrix without welds or plating and which is therefore more resistant to wear than the prior art wires with two phases.
In particular, with the design of making a plate with two components loading it with internal stresses and fixing the two layers to each other by means of the curved end portions of the thinner layer which, deformed mechanically, secures the end edges of the matrix, guaranteeing the solidity of the wire.
An advantage of the process according to the invention is to allow the production of a hollow metal wire or another similar tubular element made of two components which, before being emptied, has undergone every type of machining, even a striking with solid tools or which has been reduced (or can be reduced) into links.
Another advantage of the invention is to allow the processing of the hollow metal wire or similar tubular element, made of two or more components, in particular of gold-based alloy and silver, without the risk of separating the gold-silver interface, without imperfections and unattractive surface defects.
Lastly, the process described above is extremely competitive and economically advantageous since it not only avoids the operator from performing the welding operation, but it will not even be necessary to perform a cut the for acid emptying because the metal is free to escape directly from the access slot inside the wire.
The invention can be modified and adapted in several ways without thereby departing from the scope of the inventive concept.
Moreover, all the details of the invention may be substituted by other technically equivalent elements.
In practice, the materials used, as well as the dimensions, may be of any type, depending on requirements, provided that they are consistent with their production purposes.

Claims

1) A hollow metal wire (1 , 21 , 31 , 41 ) made of several metal components, in particular for goldsmith's, silversmith's and costume jewellery products, extending along a direction of extension (10) and comprising at least two layers (11 , 12, 13) substantially separate from each other from a metallographic point of view: a first layer (11 ) consisting of a first metal and a second layer (12), consisting of a second metal; said second layer (12) being for containing at least a portion (15) of said first layer (11 ).
2) The wire (1 , 21 , 31 , 41 ) according to the preceding claim, wherein said at least two layers (11 , 12, 13) are joined together in a substantially irremovable fashion and without mutual interconnecting means.
3) The wire (1 , 21 , 31 , 41 ) according to claim 1 or 2, wherein said at least two layers (11 , 12, 13) form an open line having a slot (16) giving access to the compartment inside the wire (1 , 21 , 31 , 41 ) and defined along the axis of extension (10), said at least second layer (12) having at least one curved end portion (14), extending along the axis of extension (10), for housing said portion (15).
4) The wire (1 , 21 , 31 , 41 ) according to any one of the preceding claims, wherein said first layer (11 ) is for supporting at least a third layer (13), consisting of one of either said first metal, said second metal or a third metal, so that the outermost face of said third layer (13) is in contact with at least one portion of the innermost face of said first layer (11 ).
5) The wire (41 ) according to any one of the preceding claims, wherein said second layer (12) is for containment of said entire first layer (11 ), said second layer (12) having a double inner supporting surface for the outermost face and the innermost face of said first layer (11 ). 6) The wire (1 , 21 , 31 ) according to any one of claims 1 to 3, wherein said at least one portion (15) is only the apical one of said first layer (11 ), in such a way that the outermost face of said first layer (11 ) rests on the innermost face of said second layer (12) and said at least one portion (15) of the innermost face of said first layer (11 ) is in contact with at least one portion (12') of the innermost face of said second layer (12).
7) A process for making a hollow metal wire (41 ) made of several metal components, comprising the steps which consist of:
- coupling at least two elongate elements, a first element (40T) of a first metal to at least a second tubular element (401") of a second metal, in such a way that the outermost face of said first element (40T) is in contact with the innermost face of said second tubular element (401"), so as to form a elongate body (402) with at least two metal components;
- flattening said elongate body (402) until obtaining a sheet-like element (403) with at least two metal components;
- drawing said sheet-like element (403) to obtain a plate (404) with at least two metal components;
- winding said plate (404) around a cylindrical support (405) made of material designed to be eliminated in a subsequent step, in such a way as to obtain a tubular body having at least three components; said cylindrical support (405) also having at least one compartment (406) defined along the direction of extension (410) of said cylindrical support (405) and for housing the edges of said first element (40T) and of said second flattened tubular element (401"); so that, during the winding of said plate (404) the edge of said flattened second tubular element (401") is curved on itself, capturing a part of the edge of said flattened first element (40T) and remaining inside said compartment (406);
- eliminating said cylindrical support (405). 17
8) A process for making a hollow metal wire (1 , 21 , 31 ) made of several metal components, comprising the steps which consist of:
- coupling at least two laminar elements, a first laminar element (101 , 201 ) of a first metal to a second laminar element (203) of a second metal, in such a way that a face of said first laminar element (101 , 201 ) is in contact with a face of said laminar element (102, 202), so as to form a sheet-like element (103, 203) with two metal components; said first laminar element (101 , 201 ) having a width (L) greater than the width (I) of said second laminar element (102, 202);
- drawing said sheet-like element (103) to obtain a plate (104, 204) with two metal components;
- winding said plate (104, 204) around a cylindrical support (105, 205) made of material designed to be eliminated in a subsequent step, in such a way as to obtain a tubular body (107, 207) having at least three components; said cylindrical support also having at least one compartment (106, 206) defined along the direction of extension (110, 210) of said cylindrical support (105, 205) and for housing the edges of said first laminar element (101 , 201 ) and of said second laminar element (102, 202); so that, during the winding of said plate (104, 204) the edge of said second laminar element (102, 202) is curved on itself, capturing a part of the edge of said first laminar element (101 , 201 ) and remaining inside said compartment (106, 206);
- eliminating said cylindrical support (105, 205).
9) The process according to the preceding claim, wherein the difference in width (L) of said first laminar element (101 , 201 ) is greater than the width (I) of said second laminar element (102, 202) is in a range of between 15% and 35%, including the limits, preferably between 18% and 32%, including the limits, more preferably between 21% and 26%, including the limits, even more preferably between 23% and 25%, including the limits. 10) The process according to claim 8 or 9, wherein said cylindrical support has two compartments (106, 206) substantially symmetrical with respect to the direction of extension (110, 210), each for housing the edges of said first laminar element (101 , 201 ) and of said second laminar element (102, 202) so that, during the winding of said plate (104, 204), two edges of said second laminar element (102, 202) are curved on themselves, capturing a part of the edges of said second laminar element (101 , 201 ).
11) The process according to any one of claims 8 to 10, comprising a step of preparing said plate (104, 204) for the winding, said preparation step comprising mechanical processing, in such a way as to incline the peripheral portions of said plate (104, 204) by a substantially right angle so as to obtain a shape of the U-shaped plate (104, 204).
12) The process according to any one of claims 8 to 11 , wherein said second laminar element (203) is made by means of the steps which consist of:
- coupling at least two laminar elements (301 , 302), a primary laminar element (301 ), of a first metal, to a secondary laminar element (302), of said first metal or of a second metal, in such a way that a face of said primary laminar element (301 ) is in contact with a face of said secondary laminar element (302), so as to form said second sheet-like element (303); said primary laminar element (301 ) having a width greater than the width of the secondary laminar element (302);
- drawing said sheet-like element (303) to obtain said second laminar element (203).
PCT/IB2021/059817 2020-10-27 2021-10-25 Hollow metal wire with multiple metal components, particularly for goldsmithing, silversmithing and custode jewellery, and its implementation process WO2022090890A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1154682B (en) * 1980-10-15 1987-01-21 Centotreaerbe Spa PROCESSING PROCEDURE FOR OBTAINING LONGITUDINAL CUTTING TUBES
EP0638256A1 (en) * 1993-08-11 1995-02-15 Comptoir Lyon-Alemand - Louyot Method for making a composite wire suitable for manufacturing hollow jewellery
US5626012A (en) * 1995-05-05 1997-05-06 Uno A Erre Italia S.P.A Method of making a decorative chain for a necklace or the like from metals having differing characteristics and resulting chain
ES2121514A1 (en) * 1995-05-31 1998-11-16 Morini Gabriele Process for producing open tubular profiles (sections) of noble metal
WO2008076967A1 (en) * 2006-12-18 2008-06-26 Arcmelt Company, Lc. Wire feedstock and process for producing the same
WO2019057335A2 (en) * 2018-11-15 2019-03-28 Theodor Stuth Method for producing a raw wire from a first metal strip and at least one further metal strip by roll profiling
WO2019211660A1 (en) * 2018-05-02 2019-11-07 Del Pia S.R.L. Method for the realization of a two layer metal wire, in particular made of gold-based alloy and of silver, and a semi-finished tubular element

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1154682B (en) * 1980-10-15 1987-01-21 Centotreaerbe Spa PROCESSING PROCEDURE FOR OBTAINING LONGITUDINAL CUTTING TUBES
EP0638256A1 (en) * 1993-08-11 1995-02-15 Comptoir Lyon-Alemand - Louyot Method for making a composite wire suitable for manufacturing hollow jewellery
US5626012A (en) * 1995-05-05 1997-05-06 Uno A Erre Italia S.P.A Method of making a decorative chain for a necklace or the like from metals having differing characteristics and resulting chain
ES2121514A1 (en) * 1995-05-31 1998-11-16 Morini Gabriele Process for producing open tubular profiles (sections) of noble metal
WO2008076967A1 (en) * 2006-12-18 2008-06-26 Arcmelt Company, Lc. Wire feedstock and process for producing the same
WO2019211660A1 (en) * 2018-05-02 2019-11-07 Del Pia S.R.L. Method for the realization of a two layer metal wire, in particular made of gold-based alloy and of silver, and a semi-finished tubular element
WO2019057335A2 (en) * 2018-11-15 2019-03-28 Theodor Stuth Method for producing a raw wire from a first metal strip and at least one further metal strip by roll profiling

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