DE19852957A1 - Process for the production of hollow goldsmith's articles - Google Patents

Description

The present invention relates to a method for producing hollow Goldsmith items, such as pendants, ear clips, brooches and others like that trained jewelry.

In the field of goldsmith technology, so-called "hollow bodies" commonly used, which consists of a housing made of a deformed thin sheet consist of precious metal.

According to the current state of the art, hollow ones are produced Jewelery in such a way that you first from a flat Low thickness sheet by compression molding and cutting a plurality of half-shells that are placed in containers.

Then the containers are made into two half-shells Taken off, assigned to each other and then in contact along theirs soldered together edges to form the end product become.  

A disadvantage of the current method is the difficulty that Put the two half-shells together precisely to complete the soldering process to be able to make.

So that the processor can determine the contact area on the regular and quickly the edges of the two opposite half-shells are to be put together to solder along these edges the thickness of the sheet must not be less than 18/100 mm-20/100 mm lie.

In addition, the entire process is carried out manually, so that too for this reason, the dimensions of the jewelry items are not very may be small so that they can be gripped and edited safely and easily can.

The object of the present invention is to provide a process for continuous and in particular automatic production of hollow ones To provide jewelry items that also enables To use precious metal sheets, their strength compared to the currently used sheet is significantly lower. Also supposed to be after this Process small parts with dimensions in the millimeter range can be produced faster than before.

This task is solved with the characteristic features of Claim 1. Appropriate developments of the invention give the Subclaims.

According to the invention, two thin strips of precious metal are made using conventional ones Pressing into two rows of half-shells by a compression molding process aligned one behind the other, processed.  

Then the two tapes, if necessary after one Degreasing treatment, put together so that each half-shell one Band of a corresponding half-shell of the other band lies opposite and these two half shells in an impeccable manner fit together, thus the final shape of the Jewelry item is set.

Then the double belt formed in this way runs through one Furnace in which the soldering of the joined edges of the two opposite half shells is performed.

After the soldering furnace, a cutting device is arranged with which the cut individual jewelry items from the two straps be, whereby the manufacturing process is ended.

The advantages of the method according to the invention are its high Precision and performance. Small parts can be cut up to five times Manufacturing faster compared to manual manufacturing. Instead of Thin sheet thicknesses in the order of 18 / 100-20 / 100 mm can already have strengths of the order of 6 / 100-8 / 100 mm are processed.

The method according to the invention can additionally advantageously be trained by looking at the concept of the invention Italian patent application VI96A000106 (filing date June 27, 1996) served. In this patent application the use of tapes is out Precious metal is described where the solder is held on the whole Surface is applied only in a central central groove, what it is allows to limit the amounts of the components to be used, whereby the remaining fineness of the metal remains unchanged remains and the metal immediately by subsequent melting and rolling can be recycled.  

As a design feature, the two thin bands on which the two half-shells are formed by pressing (hallmarks) next to a central groove, which is filled with solder, further on the side Reference marks on which the task falls, a regular and ensure precise alignment of the tapes when these be put together to shape the jewelry items reach before they get into the soldering furnace.

These fiducial marks can be made up of graphic characters drawn by a optical reading device can be detected, or from holes consist; the latter ensure in combination with a Transport device the feed for the thin belt.

The invention is explained in more detail below with reference to the drawing. It demonstrate:

Figure 1 shows a thin strip of precious metal before the compression molding process.

Figure 2 shows the thin strip of precious metal after compression molding half-shells. and

Fig. 3 shows the phases in which the thin strip of precious metal is soldered and pieces of jewelry are cut out of it.

In Fig. 1, a thin sheet or strip 1 made of valuable material (precious metal) is shown, which has a groove in the middle, in which a solder 5 is arranged. Markings 6 are arranged on the two sides, which serve as reference points and at the same time for feeding the tape.

FIG. 2 is based on FIGS. Described thin sheet or strip 1 1 after have been produced by a molding operation half-shells 2, which are disposed in mutual alignment one behind the other.

In Fig. 3, the processing phases of the process are shown, according to which two thin strips 1 ', 1' are superposed 'so that each half-shell 2' of the belt 1 'in proper manner with the corresponding half-shell 2' 'of the other strip 1' ' is put together.

This double strip then passes through a furnace 3 , where the two opposite half-shells 2 ', 2 ''are soldered to one another with the aid of the solder 5 .

The furnace 3 is followed by a cutting machine, not shown, with which the two half-shells which are soldered to one another are cut out of the thin double band, as a result of which the finished piece of jewelry 4 is obtained.

Reference list

1

tape

1

' Tape

1

'' Tape

2nd

Half shell

2nd

'Half-shell

2nd

'' Half-shell

3rd

oven

4th

Trinket

5

solder

6

Marking, reference mark

Claims (7)

1. A process for the production of hollow goldsmith objects, such as pendants, ear clips, brooches and other pieces of jewelry, characterized in that the following processing phases are carried out in succession for the purpose of continuous and automatic operation:

• - On two thin bands ( 1 ) made of precious metal, two rows of individual half-shells ( 2 ), which later form the body of the piece of jewelry ( 4 ), are produced by compression molding;
• - The two thin strips ( 1 ', 1 '') which are subjected to the compression molding process are put together by superimposing them so that each half-shell ( 2 ') of a strip ( 1 ') corresponds to a corresponding half-shell ( 2 '') of the other strip ( 1 '' ) is opposite and the two half-shells fit together perfectly;
• - The strips ( 1 ', 1 '') joined in pairs pass through a heating furnace ( 3 ) in which the opposite half-shells ( 2 ', 2 '') are soldered together;
• - The pairs of half-shells ( 2 ', 2 ''), which are soldered together, are cut out of the strips to achieve individual finished pieces of jewelry ( 4 ).

2. The method according to claim 1, characterized in that the half-shells ( 2 ) on each thin band ( 1 ) are produced in an aligned arrangement one behind the other by compression molding. 3. The method according to claim 1 and 2, characterized in that each fine tape ( 1 ) has a solder ( 5 ) which is arranged only in a central central groove. 4. The method according to the preceding claims, characterized in that each thin band ( 1 ) is provided on at least one long side with reference markings ( 6 ). 5. The method according to claim 4, characterized in that the reference marks ( 6 ) consist of graphic characters that can be read with an optical reading device. 6. The method according to claim 4, characterized in that the reference marks ( 6 ) consist of holes which come into engagement with a feed device for the thin band ( 1 ) made of precious metal. 7. The method according to one or more of the preceding claims, characterized in that the fine strip ( 1 ) made of precious metal is used in a very small thickness of only 6 / 100-8 / 100 mm.