Quality, technical skills and finest base materials
Everything that is needed to manufacture jewelry is covered by the Neumann company with their respective production departments. Product development, modelling, tooling, stamping, foundery for tin and silver, soldering, galvanic plating and assembling. The production uses only purest metals from German suppliers and components such as Swarovski crystals, brass sheet metal etc.
Our employees are trained to their best and serve our clients with their products since many decades. Neumann is offering the biggest selection of base metal clasps and 925 silver clasps worldwide. All products are manufactured in Germany under strict control of environmental and social standards. Our clasps and fashion jewelry is known to the international market for the high quality and long lasting functionality. We deliver products in many different finish colors all of them nickel, lead and cadmium free following strictly European law.
Our minimum order quantities are 100 pieces per item and color. For smaller quantities please refer to www.claspgarten.com
Sheet metal coils of brass or 925 silver are inserted in the stamping tools. Parts are cut, stamped and pressed. Different forms and mainly the clasp mechanics are stamped and formed.
Prototypes, design models, production forms etc. are developped in the modelmaking department.
Tin parts are spin casted in the tin foundery using only the best tin alloys on the market.
parts are degrated
- vision control
- small parts are copper plated for more resistance
- solder fluid is applied
- parts are dried
- parts are soldered
- We use mainly ceramic and steel tumbling abrasives with different tumbling soaps and water
silver parts up to 15 hours
brass parts up to 4 hours
tin parts up to 2 hours
- after tumbling the parts are selected
- sensible parts are dried with towels
- small grates are tumbled off
- some high polished parts are tumbled up to 48 hours
- turbo tumbling with glass and ceramics
- additional quality control
Lost wax casting
Wax items are formed and then build into a wax tree. This tree is vested under vacuum with gipsum and after that the wax is melted out to receive the negative form for silver casting. Silver casting is done under vacuum and protection gas with highly specialized German casting machines.
- all parts have to be put on brass wire before plating
- then the parts are looped
- after that the wires with parts are put on the frames
- high polished items have to be handpolished before plating
- after plating the parts have to be cut off the wire
- parts have to be cleaned with ultra sound and elctronically degreased
- After the plating with up to 6 different plating layers the frames go back to have the wires cut off
- parts are weighted for customers
- the gispum forms are heated up in the oven to 550 C
- silver is casted with 1040 C
- after cooling the gipsum is washed off
- then the silver tree is washed with solution and water
- silver parts are cut off and assembled by hot silver soldering