1, plate making

Lost wax casting to the stencil stencil, and batch production is suppressed by silverversion of the rubber mold. It is the highest requirements of operation process in the production of stainless steel jewelry, silver surface required by the system, hollowparts and back clean and no trace, the structure of each part of the reasonablerequirements of silver, inlaid

The position and the size of embedded diamond is accurate, some requirements to preprocess the embedded parts. Prepare silver version before they can enter the lost wax casting process.

Seihan technology currently in use are: Hand Carved stencil stencil, computerengraving and hand the silver edition. Three processes each have advantages,mutual supplement.

Hand carved stencil using paraffin carved design drawings on the other, then lost waxcasting pouring silver version; computer carving stencil carving wax is different from the manual which is combined by computer software 3D and wax injection machine,make investment molding, lost wax casting method using out of silver

Version; and hand-made silver edition, is the master plate directly Handmade designmodel. Because the hand carved stencil seihan speed, wax carving process is easy to modify, tool wear is relatively small and widely used.

2, lost wax casting

Lost wax casting or mold, is an important means for the production of stainless steeljewelry.

(1) pressing mold

Matters needing attention and the process of pressing rubber mould:

1) die frame and the film must be clean, the surface does not direct hand contact with the student film.

2) guarantees between the original and the rubber will not adhesion, should give priority to the use of silver, copper to silver.

3) to determine the proper curing temperature and time, both basically conforms to afunction, and the film thickness, the length and width of the original complex degree.Usually the die temperature is 150 degrees, if the film thickness in the 3 layer (about 10mm), generally the curing time is 20

In 25 minutes, if the 4 layer (about 13mm), then the curing time for 30-35 minutes. By analogy. At the same time complex degree of curing temperature and the original also has a relationship, such as the original complex, small, should reduce the curing temperature, curing time extended.

4) die to ensure there is no gap between the original and the film. The plug, winding,fill the first edition of the gap, concave and inlaid stone, fill, fill with crushed littleparticles, with a sharp material (such as tweezers).

5) first preheating. The curing time arrived quickly remove the rubber mold, plasticmold pressure a good overall requirements not deformation, smooth, not the best lineskew, the natural cooling to not hot, can serve hot with sharp knife to open operationmode operation.

(2) open mold and injection mould

1) open mode:

The high technical requirements of plastic mould. Because the plastic mold has a direct impact on the quality of wax and metal blank. Plastic mold tool is simpleoperation knife, tweezers, scissors, pliers. Rubber mold four positioning method is usually used, i.e.. Mold open four

Feet are fixed, the part between the legs are straight line cutting, but also the use ofcutting curve. Open the rubber mold is good to check, not plastic mould with brokenflowers, any defects such as obvious defects, such as adhesion, which may caused by the defects of wax, so the

Some defects should be repaired, such as incision without cutting position, weldingwax welding broken flowers, missing angle place etc..

2) note wax:

Rubber mold after opening the can wax injection operation. Wax injection operationshould pay attention to the wax temperature, pressure and the film pressing factors such as master.

Heater wax injection machine and a temperature sensor can make the wax liquid to achieve and maintain a certain temperature, usually wax injection machine in waxtemperature should be maintained at between 70-75 degrees, such as the temperature can ensure the liquidity of wax liquid. If the temperature is too low, not easy to fill the liquid wax wax, resulting in wax

Incomplete; otherwise the wax liquid temperature is too high, will cause the liquid waxwax gap from overflow or from wax injection mouth overflow, easy to form a flash,bubble or burn your fingers. Wax injection machine cylinder pressure is provided byexternal pump, wax like flat, more simple shape with 0.5-0.8kg/cm pressure

. Waxy thin walls, inlaid stone and narrow gap with 1.0-2.0 kg/cm. Jack: big time aswax wax like 4 seconds, a fine piece of wax like 2 seconds.

Note: the wax wax injection before, should first open the rubber mold, plastic moldintegrity check and clean. If the rubber mold is used, it should to glue mold especially the beginning small complicated position spray dewaxing agent (can also sprinkle a little talcum powder), in order to remove the wax. Take off

Wax and talcum powder can not be used at the same time, talcum powder can not be used too much, lest cause wax support surface roughness. Take a powder can play 3-6 wax piece. And then to preheat the wax injection machine, open the pump, adjust the pressure and temperature.

Wax injection, start the vacuum pump, check the wax temperature is between 70-75 degrees, check pressure and plastic mold wax complicated degree adjusted according to wax injection time, and then the rubber mold clamping plate in the hands, note the finger distribution should make the rubber mold is evenly pressed; the rubber moldwater mouth to

The quasi parallel implementation of top up injection wax mouth, hands still noteGrosbeak, gently with the feet step synthetic wax injection switch and then release,when the indicator light wax injection machine from yellow to red, and then green, saidwax injection process has been completed, the rubber mold is removed from theHawfinch side. In chronological order note wax

Good rubber mold, when continuous injection of 6-7 plastic die, you can open the firstmold (if the rubber mold bottom, should first will die bottom out, remove the wax, etc.).Modulus is should pay attention to tactics, avoid wax pieces of broken and deformation, wax removal after careful examination, if the lack of edge

The problem, claws cut, deformation, severe flash or more bubbles, this wax belongs to waste. If it is a very small defects, it should be wax finishing.

The wax injection materials: modeling of wax blue, melt at 60 ℃, wax injection at 65 ℃.

The wax injection tools: wax injection machine, wind pressure and vacuum type two.Vacuum can first will glue film vacuum, then to the film wax injection; wind pressuredirectly to the film wax injection.

3) dressing wax and wax tree

Trim the wax models: general, wax wax injection after removing exist some problems.For flash, multiple edges, clip, the flower is not clear or edge defects can useoperation blade repair light; for trachoma, broken bones can be used welding wax forrepair welding; keyhole impassability

Can penetrate the welding needle for; for the wax models of deformation can becorrected in the 40 - 50 ℃ hot water in the. If the hand is "wrong, to repair the waxdirectly to the finger ring.

Method: the natural wax prepared according to certain order, welding wax along the circumferential direction are hierarchically welding on a stick, finally get a similar to the shape of the tree privet.

The first step is a natural wax liquid wax stick head dipped in melted, while hot into the chassis of the concave hole;

The second step, layer by layer will wax welded in wax stick. General from the wax stick head start, this method can prevent from top to bottom wax dripping wax meltingin the welding is good, to avoid unnecessary rework.

The basic requirements for ash is wax to orderly arrangement, wax and wax rod 45 °for casting, both can not contact, but also as much as possible will wax welding in ash,in order to meet the need of mass production.

(3) with gypsum and baking gypsum

Irrigation gypsum: good ash even the chassis together a stainless steel cylinder; the corresponding weight of gypsum powder and water and stir into the gypsum slurry, the first vacuum, inner wall of the gypsum slurry along steel bell slowly into Shi Gaojiang,not to be directly into ash. Not until the gypsum slurry

Ash is about 1cm, second vacuum. And then the natural place to ensure the solidification of gypsum 12-24 hours.

Baking gypsum: baking plaster mold is an important step to guarantee the normalcasting, his role is dewaxing, drying and casting insulation.

In general, dewaxing temperature 0250 ℃, holding time is 1.5--2 hours; dryingtemperature is 250600 ℃, holding time is 2-3 hours; intermediate temperature is 600--900 ℃, holding time is 2-3 hours; casting temperature is 9001000 ℃, holding time is2

Hours.