Gold-alloy small spring forming method

FIELD: manufacture of jewelry articles, possibly manufacture of gold-alloy small springs of locks of snap hooks in jewelry industry.

SUBSTANCE: method comprises steps of winding from wire prepared by deforming alloy at several stage with intermediate annealing between said stages small spring; at last stage deforming alloy by drawing at total reduction degree exceeding 85% but less than 95%. Preferably drawing of wire is started from initial diameter of wire din = 1mm till final diameter df = 0.35 mm for 13 passes at total reduction degree 87.3%. Spring is made of gold alloy with purity 385.

EFFECT: enhanced elastic properties of spring, improved manufacturing process for realizing the method.

3 cl, 1 ex

 

The invention relates to the field of jewelry making and can be used in the jewelry industry for the manufacture of springs castles carbines from alloys of gold.

The spring is made from an alloy of gold, mainly 585, designed for opening and closing of the carabiner when using cervical jewelry: chains, necklaces and the like, as well as decorative bracelets. With the opening of the carabiner is compressing the springs inside its body and the release groove (spring compressed), where the wound end of the eyelet, and then, under the action of the springs, the box is moved in the opposite direction, overlapping the groove.

The closest analogue of the invention is a method of making springs from an alloy of gold, including a receive operation wire by deforming the alloy in several stages with intermediate annealing of the alloy between the stages and the operation of winding wire obtained with the formation of the springs (US 5173132, 22.12.1992, With 22 5/02).

The spring known way to get in several stages, with the initial stage of the receive wire with increased flexibility, which is achieved by "softening" heat treatment - heating to a temperature of 1200-1400 degrees Fahrenheit and cooling, and at the final stage carry out the deformation and ageing of the alloy for making the elastic spring t the century

The disadvantages of this method are the low elastic properties of the springs, which under cyclic loading have quite large shrinkage, and low-tech.

Technical problem which the claimed invention is directed, is to eliminate said drawbacks, namely: development of high-tech method of making springs from a gold alloy having a high elastic properties.

The problem is solved in that in the method of manufacturing the springs of an alloy of gold, including a receive operation wire by deforming the alloy in several stages with intermediate annealing of the alloy between the stages and the operation of winding wire obtained with the formation of the springs, the deformation of the alloy upon receipt of the wire at the last stage of the drawing, with a total compression, the value of which more than 85%but less than 95%.

After the last step of receiving the wire does not conduct heat treatment (annealing), and the wire is fed to the operation of winding the springs.

It is this set of essential features allows you to achieve the technical result consists in increasing the elastic properties of the springs, reduces shrinkage when the springs are in the conditions of cyclic loading.

The total compression in the drawing set the Expo is imentally by, and it is not obvious to a person skilled in the art.

The most preferable variant of the invention is a method in which at last the final stage of conducting wire drawing with an initial wire diameter dn=1 mm to destination dto=0,35 mm 13 passes with a total compression of 87.3%, where dn- the initial wire diameter in mm, and dto- the final wire diameter in mm

The proposed method is most preferred for the manufacture of springs of an alloy of gold 585.

The essence of the proposed method is illustrated an example of a preferred variant of the invention is the manufacture of springs of an alloy of gold 585.

To obtain the alloy to use the following components: gold is 58.5-59.0%of silver, 7.5 to 8.5%, copper 32,5 is 34.0%.

After heating induction furnace to t 1010-1020°C alloy components are loaded into the crucible in the following sequence: first, gold stripes, folded in 4 layers, and silver flakes, and after complete melting of added copper. The melting time of 8-10 minutes Casting is made in a pre-heated up to 200-250°and lubricated With a thin layer of calcined oil cast iron ingot moulds.

The resulting ingots of the alloy is melted in induction furnace continuous casting to obtain a rod d=8 mm, Melting is carried out under the protection of argon is, at t=1010-1020°C with the speed of the traction rod 300 mm/min

Then spend the deformation of the rod received in several stages with intermediate annealing between steps with the purpose of reception of the wire, from which wound springs.

1. Rolling rod with d=8 mm to square (sq) 4.1 mm for passage 53 is performed on the equipment: rollers of the firm "MARIO di MAIO" (Italy), steel rolls with streams square profile. The rolling speed of 5.2-5.5 m/min, the total compression 66,5%.

Intermediate annealing rolled square 4,1 spend on equipment: electric conveyor oven with eskikaya atmosphere of the firm "IECO". Temperature annealing (tOTG)=680-690°C. the Speed of the tape 0,2±0.02 m/min

2. Rolling wire with 4.1 mm square to square 2,4 25 passes performed on the equipment: rollers of the firm "CAVALLIN" (Italy), steel rolls with streams square profile. The rolling speed of 20-25 m/min, the total compression 65.7 per cent.

Intermediate annealing wire square 2,4 spend on equipment: electric chamber furnace with eskikaya atmosphere and quenching in a water bath company "IECO". Temperature annealing (tOTG)=680-690°C. the Time of 35-40 minutes

3. Rolling wire 2.4 mm square to square 1.5 for 9 passes performed on the equipment: rollers of the firm "CAVALLIN (Italy). The rolling speed of 20-25 m/min, the total compression 61,0%.

Intermediate annealing wire square 1.5 to spend on equipment is AI: electric chamber furnace company "IECO". Temperature annealing (tOTG)=680-690°C. the Time of 35-40 minutes

4. Drawing of a wire with a square 1.5 and d=1.2 mm for 6 passages spend on equipment: wire drawing machine with 2 stage clips (Italy). Lubricating and cooling liquid in the drawing - soap emulsion (150 grams soap "Child" to 10 litres of water). Diamond drawing dies GOST 6271-E. The total compression of 50%. Speed drawing of 25-30 m/min

Intermediate annealing of wire d=1.2 mm is performed on the equipment: electric chamber furnace with eskikaya atmosphere and quenching in a water bath company "IECO". Temperature annealing (tOTG)=680-690°C. the Time of 30-35 minutes.

5. Drawing of a wire with d=1.2 mm to d=1 mm 2-pass is performed on the equipment of stage 4. The total compression of 30%. Speed drawing of 25-30 m/min

Intermediate annealing of wire d=1 mm is performed on the equipment of the stage 4 in the same mode.

6. Drawing of a wire with d=1 mm to d=0.35 mm for 13 passes performed on the equipment of stage 4. The total compression of 87.3%. Speed drawing of 25-30 m/min

Annealing is not performed.

Manufacturer of springs made on the machine for the manufacture of springs of their own making.

The springs are made by the proposed method, tested in fully assembled cyclic load, which resulted in the increase of their elastic properties.

1. Way the of the springs of an alloy of gold, includes a receive operation wire by deforming the alloy in several stages with intermediate anneals between stages and the operation of winding wire obtained with the formation of springs, characterized in that the deformation of the alloy upon receipt of the wire at the last stage of the drawing, with a total compression, the value of which more than 85%but less than or equal to 95%.

2. The method according to claim 1, characterized in that the drawing is done with the initial wire diameter dn=1 mm to destination dk=0,35 mm 13 passes with a total compression of 87.3%.

3. The method according to claim 1 or 2, characterized in that use alloy gold 585.



 

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SUBSTANCE: method comprises steps of forming wire of gold alloy by deforming during several stages at intermediate annealing procedures between said stages; at last stage of wire forming deforming alloy by drawing it at total reduction degree 65 - 85%; then winding spring of formed wire. In preferable variant of invention last stage of drawing is realized during eight passes at total reduction degree 77.8%. The most effective method of forming springs is realized at using gold of purity degree 585.

EFFECT: enhanced manufacturing effectiveness, improved quality of articles due to their enhanced elastic properties.

3 cl, 1 ex

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