CN113737048A

CN113737048A - Alloy, semi-finished product made of alloy, ornament with semi-finished product and method for manufacturing semi-finished product

Info

Publication number: CN113737048A
Application number: CN202110586232.XA
Authority: CN
Inventors: 乔治·华洛芙
Original assignee: Dr Alex Wellendorff & CoKg GmbH
Current assignee: Dr Alex Wellendorff & CoKg GmbH; Dr Alex Wellendorff GmbH and Co KG
Priority date: 2020-05-27
Filing date: 2021-05-27
Publication date: 2021-12-03
Also published as: JP2021188134A; CA3117154A1; US20210371956A1; CH717467A2; DE102020206620A1

Abstract

The invention relates to an alloy consisting of at least 33 m% and at most 75.5 m% gold, at least 1.5 m% and at most 45 m% silver, at least 8 m% and at most 45 m% copper, and the balance zinc. The invention also relates to a semi-finished product made of such an alloy, to an ornamental article having at least one such semi-finished product, and to a method for manufacturing such a semi-finished product.

Description

Alloy, semi-finished product made of alloy, ornament with semi-finished product and method for manufacturing semi-finished product

Technical Field

The invention relates to an alloy, in particular a noble metal alloy, a semifinished product made of such an alloy, an article having at least one such semifinished product and a method for producing such a semifinished product.

Background

Alloys, in particular noble metal alloys, having a gold content of at least 33 m% (mass%), in particular gold alloys, generally have a high ductility. Their reaction to shear stress in particular is generally plastic deformation, in which they generally break under increased stress. This limits the use of such alloys, especially in certain ornaments where elastic properties are required, or it seems impossible to manufacture elastic ornaments from alloys, especially noble metal alloys containing at least 33 m% gold, especially gold alloys.

Disclosure of Invention

The object of the invention is to provide an alloy, a semifinished product made of such an alloy, an item of jewellery with at least one such semifinished product, and a method for producing such a semifinished product, in which the above-mentioned problems are overcome.

The objects of the present invention are achieved by the technical teaching presented herein.

The object of the invention is achieved in particular by an alloy consisting of at least 33 m% and at most 75.5 m% gold, at least 1.5 m% and at most 45 m% silver, at least 8 m% and at most 45 m% copper, and the balance zinc. As a result, it has surprisingly been found that such an alloy makes it possible to manufacture semi-finished products and in particular ornaments having elastic properties. Thus, semi-finished products and ornaments having elastic properties can be formed from the gold-containing alloys, and conversely, resilient, in particular at least limited elastic deformability, semi-finished products and ornaments can be produced using gold-containing alloys. This on the one hand enlarges the range of applications for gold-containing alloys and on the other hand also enables the manufacture of certain ornaments from or using gold with elastic properties.

In particular, the sum of the individual constituents given in the alloy together with the remaining zinc mass component amounts to 100 m%.

Within the scope of the technical teaching given here, the term "zinc remaining" means in particular that the missing part of the alloy which constitutes 100 m% of the alloy consists of zinc constituents, with respect to the constituents of the alloy which are given in a specific mass percentage range or a specific mass fraction. According to one embodiment, the zinc component is pure zinc. According to another embodiment, the zinc component comprises zinc and especially unavoidable impurities, in particular trace impurities.

According to a development of the invention, the copper content in the alloy is at least 9 m% and at most 42 m%, preferably at least 17 m% and at most 27 m%.

Preferably, the copper content is at most 40 m%, preferably at most 35 m%, preferably at most 30 m%, preferably at most 25 m%, preferably at most 20 m%; preferably at least 10 m%, preferably at least 15 m%, preferably at least 18 m%; preferably from a minimum of 16 m% to a maximum of 21.5 m%, preferably from a minimum of 19 m% to a maximum of 21 m%, preferably from a minimum of 19.6 m% to a maximum of 20.6 m%.

According to a development of the invention, the silver content in the alloy is at least 2.5 m% and at most 39 m%, preferably at least 3.5 m% and at most 27.5 m%.

Preferably, the silver content is at most 40 m%, preferably at most 35 m%, preferably at most 30 m%, preferably at most 25 m%, preferably at most 20 m%, preferably at most 15 m%, preferably at most 10 m%, preferably at most 5 m%, preferably at most 4 m%; preferably at least 2 m%, preferably at least 3 m%, preferably at least 5 m%, preferably at least 10 m%, preferably at least 15 m%; preferably from a minimum of 3.8 m% to a maximum of 4.2 m%, preferably from a minimum of 3.9 m% to a maximum of 4.1 m%.

Preferably the gold content in the alloy is from a minimum of 33.3 m% to a maximum of 75.5 m%, preferably a minimum of 40 m%, preferably a minimum of 45 m%, preferably a minimum of 50 m%, preferably a minimum of 55 m%, preferably a minimum of 60 m%, preferably a minimum of 65 m%; preferably 70 m% minimum to 75.3 m% maximum, preferably 75 m% minimum to 75.1 m% maximum.

Preferably the alloy consists of at least 70 m% and at most 75.5 m% gold, at least 2.7 m% and at most 4.2 m% silver, at least 16 m% and at most 21.5 m% copper, and the balance zinc.

Preferably the alloy consists of at least 75 m% up to 75.1 m% gold, at least 3.7 m% up to 4.0 m% silver, at least 19 m% up to 21 m% copper, the remainder being zinc.

Preferably the alloy consists of at least 75 m% to at most 75.1 m% gold, preferably at least 3.1 m% to at most 4.0 m% silver, preferably at least 19.6 m% to at most 21.6 m% copper, the remainder being zinc.

Preferably the alloy consists of 75 m% gold, 4.3 m% silver, 20 m% copper and the balance zinc.

Preferably, the alloy consists of 75.1 m% gold, 4.0 m% silver, 20.6 m% copper, and the balance zinc.

Preferably, the alloy consists of 75.5 m% gold, 2.1 m% silver, 22 m% copper, and the balance zinc.

Preferably, the alloy consists of 75 m% gold, 1.7 m% silver, 23 m% copper, and the balance zinc.

The object of the invention is also achieved by a semifinished product having an alloy according to the invention or an alloy according to one of the embodiments described above. Preferably, the semifinished product is made of one such alloy. The semi-finished product is in the shape of a slotted tube. Advantageously, such a semi-finished product has elastic properties, in particular when loaded in a direction perpendicular to the longitudinal extension of the slotted tube. Such semifinished products in the form of slotted tubes are also referred to as hollow (noble) wires (Scharnier).

According to a development of the invention, the semifinished product consists of a metal sheet extending in the first direction. This first direction corresponds to the direction of longitudinal extension of the semifinished product, in particular of the slotted tube, and thus to the longitudinal direction of the slotted tube. The metal sheet is shaped, preferably bent, in a circular ring, in particular in a circular ring segment, in a second direction perpendicular to the first direction, wherein the second direction preferably extends in a plane tensioned by the surface of the metal sheet. In this way, a slotted tube is formed in particular. The slit is formed here by arranging two opposite ends of the metal sheet at a limited distance from each other along an imaginary circular line, whereby the tube does not have a closed circular cross section, but a cross section in the form of a circular ring segment which is partially open in the form of a slit. The cross-section of the semi-finished product is here a plane perpendicular to the longitudinal direction.

The metal sheet is preferably shaped into the shape of a circular ring segment by drawing, in particular drawing, through a circular drawing die.

The semi-finished product thus produced preferably has an outer diameter of at least 0.3mm and at most 5.0mm, preferably at least 0.5mm and at most 1.5mm, preferably at least 0.9mm and at most 1.3mm, preferably at least 0.99mm and at most 1.2 mm.

The inner diameter of the semifinished product in the form of a slotted tube is preferably from a minimum of 0.03mm to a maximum of 4.5mm, preferably from 0.4mm to 3mm, preferably from a minimum of 0.55mm to a maximum of 0.76 mm.

The minimum distance between the ends of the metal sheet bent over one another in the region of the gap is preferably at least 0.02mm and at most 1.0mm, preferably at least 0.04mm and at most 0.08mm, preferably 0.06 mm.

In a preferred embodiment, the semi-finished product has an outer diameter of 1.2mm, an inner diameter of 0.76mm and a minimum distance in the region of the gap of 0.06 mm.

In another preferred embodiment, the semi-finished product has an outer diameter of 0.99mm, an inner diameter of 0.55mm and a minimum distance in the area of the gap of 0.06 mm.

According to a development of the invention, the semifinished product has a spring constant, in particular a spring constant measured at a distance of 15mm from the clamping (einspan), in particular a spring constant of 1500N/m to a maximum 2200N/m, preferably of 1600N/m to a maximum 2100N/m, preferably of 1700N/m to a maximum 2050N/m, in particular 1964N/m in the case of a clamping-directed force with a gap, in particular of 2025N/m in the case of a clamping-directed reaction force with a gap, in particular of 1720N/m in the case of a clamping-directed force with a gap oriented perpendicularly to the force, in particular in the case of a clamping with a gap oriented at a speed of 0.1mm/s with the aid of a pressure. In particular, corresponding values of the spring constant are determined for such a semifinished product, from which it can be shown that the semifinished product formed in this way, in particular produced according to the method described below, has elastic properties. The specified values for a particular grip can be determined in particular for a semifinished product having an alloy comprising 75.1 m% gold, 4.0 m% silver, 20.6 m% copper and the remainder zinc. For a correspondingly clamped sample consisting of a conventional gold alloy with a gold content of 75 m%, the spring constant obtained before hardening was 1106N/m and the spring constant after hardening was 1008N/m. For the correspondingly clamped spring steel samples, a spring constant of 3958N/m was obtained. It can therefore be seen that the semi-finished product proposed here, made of the alloy proposed here, has a significantly increased spring constant in the spring steel direction compared to conventional gold alloys.

The object of the invention is also achieved by an item of jewellery having at least one semifinished product according to the invention or according to the embodiments described above, which is wound at least partially in the longitudinal direction, i.e. in the first direction. In this way, a resilient decoration made of gold-containing alloys or gold alloys can advantageously be provided.

The semifinished product is therefore wound in particular in the longitudinal direction of the slotted tube.

The semifinished product is preferably helically wound in a first direction. This makes it possible to give the semifinished product a spiral spring-like appearance in particular.

According to a development of the invention, the article has at least two semifinished products which are wound parallel to one another in the respective longitudinal direction, i.e. the first direction. These semifinished products are arranged adjacent to one another in particular along their common extent, i.e. in particular along helical windings extending parallel to one another. The ornament thus preferably has a helically shaped strand, in particular a bifilar strand, formed from at least two semifinished products. These semifinished products are preferably mechanically, preferably non-detachably, connected to one another at least one end by end pieces. In particular, they can be welded or glued to the end pieces. It is particularly preferred that the ornament has one such end piece at each end of the blank.

It is also possible for the ornament to have exactly one semifinished product wound in the first direction. According to a further embodiment of the invention, the ornament can also have exactly two semifinished products which are wound parallel to one another in the first direction. According to another preferred embodiment, the ornament may also have more than two semifinished products wound parallel to each other in the first direction. In particular, the article may have three, four, five or more such semi-finished products.

According to a development of the invention, at least one semifinished item of jewellery is wrapped on its circumference, i.e. circumferentially, with a noble metal wire, in particular a gold wire (golddr aht), a platinum wire (platldaht) or another noble metal wire, in particular a gold yellow wire (gelbgoldaht) or a gold white wire (Wei β gold ldaht). The semifinished product is preferably completely wound with the noble metal wire over its entire longitudinal extent, in particular in the form of a helix. It is particularly preferred to wrap the noble metal wire in a tightly helical fashion around the semifinished product, so that the semifinished product is completely covered, i.e. in particular completely wrapped, by the noble metal wire. In this way, a very high-value appearance of the ornament is achieved.

Preferably, at least two semifinished products of the article are each wound with a noble metal wire in the circumferential direction.

Preferably, the article has a setting for at least one ornamental gemstone at least one end. It is particularly preferred that at least one of the end members be configured as such a setting for one or more ornamental gemstones. Preferably, the article has such a setting, in particular an end piece, for at least one ornamental gemstone at both ends of at least one semifinished product.

According to a development of the invention, the accessory is designed as a bracelet. Due to its elastic design, the ornament can be placed around the arm, in particular the forearm, and especially close to the wrist, in a very simple and elegant manner.

The object of the invention is also achieved by a method for producing a semifinished product according to the invention or in the embodiments of the invention described above. The method comprises the following steps: producing a metal sheet elongated in a first direction from an alloy according to the invention or an embodiment of the invention; forming the metal sheet into a slotted tube; the slotted tube is cured at a specific curing temperature for a specific curing time. The specific curing temperature is at least 100 ℃ and at most 400 ℃, preferably at least 250 ℃ and at most 300 ℃, preferably at least 270 ℃ and at most 290 ℃, preferably 270 ℃, 275 ℃, preferably 280 ℃, preferably 285 ℃, preferably 290 ℃. The specific curing time is at least 2 hours and at most 8 hours, preferably at least 3 hours and at most 7 hours, preferably at least 4 hours and at most 6 hours, preferably 2 hours, preferably 2.5 hours, preferably 3 hours, preferably 3.5 hours, preferably 4 hours, preferably 4.5 hours, preferably 5 hours, preferably 5.5 hours, preferably 6 hours.

Preferably, the curing temperature is 270 ℃ and the curing time is 6 hours. Preferably, the curing temperature is 280 ℃ and the curing time is 4 hours. Preferably, the curing temperature is 285 ℃ and the curing time is 3.5 hours. Preferably, the curing temperature is 290 ℃ and the curing time is 3 hours. Preferably, the curing temperature is 300 ℃ and the curing time is 2.5 hours.

The semi-finished product is finally obtained by providing an elongated metal sheet, shaping the metal sheet into a slotted tube and subsequently hardening the slotted tube.

In particular, the metal sheet is obtained by casting a molten alloy and subsequently rolling.

In particular, a metal sheet is formed into a slotted tube by drawing it through a circular die.

Within the scope of the method according to the invention, semifinished products can advantageously be obtained from gold-containing alloys or gold alloys having elastic properties.

According to a development of the invention, the semifinished product is wound helically in a first direction. In this way an ornamental article can be obtained. Preferably, at least two, preferably exactly two or more semifinished products helically wound in the first direction are arranged so as to extend alongside one another, in particular parallel, and in this way an ornament is obtained.

According to a development of the invention, the semifinished product is wound along its circumference, i.e. in the circumferential direction, with a noble metal wire, in particular a gold or platinum wire, or another noble metal wire, in particular a gold or platinum wire.

At least two semifinished products extending parallel to one another are preferably wound with a noble metal wire. Alternatively, the semifinished products are preferably also wound separately from one another in the circumferential direction with the noble metal wire. The semifinished products are then wound helically parallel to one another.

At least two semifinished products wound parallel to one another are preferably mechanically connected to one another at least one end, in particular by an end piece, preferably by a setting for at least one ornamental gemstone. The semifinished product is preferably connected at both ends thereof to an end piece, in particular a setting for at least one ornamental gemstone.

In this way, an ornament, preferably a bracelet, is obtained, among other things.

Drawings

The invention is explained in detail below with the aid of the figures. In which is shown:

FIG. 1 schematically shows a cross-sectional view of an embodiment of a semi-finished product, an

Figure 2 illustrates an embodiment of the article.

Detailed Description

Fig. 1 schematically shows a cross-sectional view of an embodiment of a semi-finished product 1. The semifinished product 1 is in the form of a slotted tube 2, the tube 2 extending in a longitudinal direction perpendicular to the drawing plane of fig. 1. This longitudinal direction is also referred to herein as the first direction. The semi-finished product 1 consists of a metal sheet 3 extending in a first direction or longitudinal direction, the metal sheet 3 being formed in a second direction perpendicular to the first direction in a circular, in particular circular arc shape, preferably by drawing the metal sheet 3 through a circular drawing die.

The semi-finished product consists of an alloy. The alloy consists in particular of at least 33 m% up to 75.5 m% gold, 1.5 m% up to 45 m% silver, at least 8 m% up to 45 m% copper, the remainder being zinc.

The copper content in the alloy is preferably at least 9 m% and at most 42 m%, preferably at least 17 m% and at most 27 m%.

The silver content in the alloy is preferably at least 2.5 m% and at most 39 m%, preferably at least 3.5 m% and at most 27.5 m%.

Preferably, the outer diameter D1 of the semi-finished product 1 is at least 0.3mm and at most 5.0 mm. The inner diameter D2 of the semifinished product 1 is preferably at least 0.03mm and at most 4.5 mm. The minimum distance a in the region of the gap of the semifinished product 1 is preferably at least 0.02mm and at most 1.0 mm.

Preferably, the semifinished product 1 has a spring constant, measured perpendicularly to the longitudinal extension, in particular at a distance of 15mm from the clamping point, of at least 1500N/m and at most 2200N/m, preferably at least 1600N/m and at most 2100N/m, preferably at least 1700N/m and at most 2050N/m.

The semi-finished product 1 is preferably manufactured by making an elongated metal sheet 3 from an alloy, in particular by casting and rolling. The sheet metal is then formed into a slotted tube 2, in particular by drawing the sheet metal 3 through a circular drawing die. The slotted tube 2 is then preferably cured at a curing temperature of at least 100 ℃ up to 400 ℃ for a curing time of at least 2 hours up to 8 hours. In this way, a semi-finished product 1 is finally obtained.

The semifinished product 1 is preferably wound helically, in order to obtain, in particular, a decoration. The semi-finished product 1 is preferably wound with a noble metal wire, in particular a gold or platinum wire, or another noble metal wire, in particular a gold or platinum wire, in the circumferential direction (direction of arrow P in fig. 1 or in the opposite direction).

Fig. 2 shows an embodiment of an article 5 according to the invention, wherein the article 5 has at least one semifinished product 1 according to fig. 1 wound at least partially in a first direction. The ornament 5 here has in particular two such semifinished products 1, which are wound parallel to one another in their respective longitudinal direction. These semifinished products 1 are wound helically into two strands. In other embodiments, however, the ornament 5 may also have exactly only one semifinished product 1 wound in the first direction, or more than two semifinished products 1 wound parallel to one another in their respective longitudinal direction.

Fig. 2 also shows that the semifinished products 1 are each wound with a noble metal wire 7 in the circumferential direction, so that the actual semifinished product 1 is not visible to an observer.

At least one end of the semi-finished product 1 is an end piece 9, preferably arranged in a manner not shown for at least one inlay of jewellery stones. In particular, both semifinished products 1 are mechanically connected to the end piece 9, preferably by welding or gluing.

In a preferred embodiment, the semifinished product 1 has one such end piece 9 on each end.

The ornament 5 is in particular designed as a bracelet 11.

Claims

1. An alloy consisting of the following components:

-at least 33 m% and at most 75.5 m% gold,

-at least 1.5 m% to at most 45 m% silver,

-at least 8 m% and at most 45 m% copper,

-the remainder being zinc.

2. An alloy according to claim 1, wherein the copper content in the alloy is at least 9 m% and at most 42 m%, preferably at least 17 m% and at most 27 m%.

3. An alloy according to claim 1 or 2, wherein the silver content in the alloy is at least 2.5 m% and at most 39 m%, preferably at least 3.5 m% and at most 27.5 m%.

4. Semi-finished product (1) in the form of a slotted tube (2), comprising an alloy according to any one of the preceding claims.

5. Semi-finished product (1) according to claim 4, wherein the semi-finished product (1) consists of a metal sheet (3) extending in a first direction, the metal sheet (3) being shaped in a circular ring, in particular in a circular ring segment, in a second direction perpendicular to the first direction.

6. Semi-finished product (1) according to claim 4 or 5, wherein the semi-finished product (1) has a spring constant, in particular measured at a distance of 15mm from the clamping, of at least 1500N/m to at most 2200N/m, preferably at least 1600N/m to at most 2100N/m, preferably at least 1700N/m to at most 2050N/m.

7. An ornamental article (5) having at least one semifinished product (1) according to any one of claims 4 to 6, wound at least partially in a longitudinal direction.

8. The ornamental article (5) according to claim 7, wherein said article (5) has at least two semifinished products (1) wound parallel to each other in respective longitudinal directions.

9. The item of jewellery (5) according to claim 7 or 8, wherein at least one semifinished product (1) of the item of jewellery (5) is wound with a noble metal wire (7) on its circumference.

10. The ornamental article (5) according to any of claims 7 to 9, wherein said ornamental article (5) is configured as a bracelet (11).

11. Method for manufacturing a semi-finished product (1) according to any one of claims 4 to 6, having the following steps:

-manufacturing a metal sheet (3) elongated in a first direction from an alloy according to any one of claims 1 to 3;

-forming the metal sheet (3) into a slotted tube (2);

-curing the slotted tube (2) at a specific curing temperature of at least 100 ℃ and at most 400 ℃ for a specific curing time of at least 2 hours and at most 8 hours, and

-obtaining said semi-finished product (1).

12. Method according to claim 11, wherein the semi-finished product (1) is helically wound in the first direction.

13. Method according to claim 11 or 12, wherein the semi-finished product (1) is wound with a noble metal wire (7) along its circumference.