Modern jewelry manufacturing industry lost wax casting process is commonly used bythe ancient casting process development. About 5000 years ago in the late Neolithic age, ancient Chinese craftsmen in the bronze production has been widely used in the lost wax casting process. At the time of the craftsmen according to beeswax and plasticity

The characteristics of the thermal volatile, the beeswax carved in wax to shape, and then wrapped in wax and clay and set aside a small hole, dry roasting, the waxgasification volatilization, and clay is a ceramic shell, the inner wall of the shell leftfemale mold wax. When the molten gold

Genus along the holes into the shell, cooling after the break the shell, to obtain thedesired metal casting. The basic principle is not modern lost wax casting technology,but more sophisticated. This is mainly reflected in the more strict on wax type accuraterequirements. Get wax pattern of modern technology in the

Not only to the wax carving directly, but also through the original metal mold (version)silicone molding to obtain the female die, wax and obtained by silica gel die wax injection after. The casting material is no longer clay, and substituting plaster casting.Such products than the ancient casting fine much.

Xia, Shang, Wednesday generation created a glorious and resplendent bronze culture, a lot of complex shape, ornamentation, elaborate workmanship bronze castings has been. The spring and Autumn period to create the lost wax method,stack casting method of advanced technology, using the gems, copper and goldprocessing technology of cast post

. To the Warring States period and the emergence of gold plating process. In the late spring and Autumn period, Chinese into the early iron age, when the Warring States,iron has been very popular. When the Western Han Dynasty to become the largestindustrial sector iron hand, then fried iron technology. In the northern and Southern Dynasties and invented a new technology with steel steelmaking,

Blast furnace facilities also invention, the Han Dynasty using hydraulic skin and the invention of the Song Dynasty, the Ming Dynasty wood fan, improved as wood. In Shang Dynasty, our ancestors for smelting and casting technology of bronze have been very skilled, to the spring and Autumn period into the iron age, even in the Warring States Period

Period, more developed a set of steelmaking technology, including steel, steel, steel,steel and so on with irrigation. Because China is the world’s first use of blast furnace ironmaking state, so in ancient times of ironmaking technology belongs to a high level of. Secondly, in the early times compared

The strong blast system to strengthen the furnace temperature, can shorten thesmelting time. After carburizing steel, steel, steel, fry, "iron law" invention, is an important milepost. Method is to select high quality iron ore, pig iron smelting, then liquid pig iron casting in cooked

Iron, after melting the carburization of iron and steel is. This method not only speeds up the iron smelting time, and reduce the number of forged, and the operation is simple, and has a profound influence on the later steelmaking technology.

Modern lost wax casting is the main means of jewelry production.

Lost wax casting is the essence of precision casting machining methods of. Thevolume precision casting used in jewelry manufacturing is a prominent feature of the modern jewelry manufacturing industry. Jewelry manufacturing lost wax casting can meet the requirement of mass production, change also can take into account thestyles or breed, so in the first

Occupy an important position trim manufacturing mode of production. Lost wax castingmethod for casting with vacuum suction casting, centrifugal casting, vacuum pressurecasting and vacuum centrifugal casting and so on, is the main means of mass production at present jewelry manufacturing.

Lost wax casting process is: the original model (usually silver version) with silica gelsurrounded by heating and pressurizing vulcanization, produce, pressed into a mold;plastic die cut with a sharp blade according to a certain order, remove the silverversion, get the rubber mold hollow; to the rubber mold wax injection hollow, waxcoagulation the liquid

Solid after the open mold removing wax; used for trimming the wax wax according to a certain arrangement for ash, put into a steel sleeve perfusion temperature gypsum slurry; gypsum by vacuum pumping, natural hardening, according to a certaintemperature period after drying, melting metal casting (can use the positive or negative pressure

The principle of the metal casting); after cooling will be cast into the cold water friedwash, pickling, cleaning out after casting, cut blank rolling light; then they die and mosaic, surface treatment, will become the finished. The above mentioned positive pressure, negative pressure casting is a casting in casting process

In the state of pressure. Positive pressure casting by centrifugal casting represented,in the casting process, the molten metal into the mold, mold pressure to atmospheric pressure, so to make the liquid metal into the mold must be made to overcome the effect of atmospheric pressure metal -- centrifugal casting is the liquid gold

The crucible and the mold is installed in the high-speed rotation of the disk, the centrifugal force makes the liquid metal in the disc method (radial) to high speed flow,resulting in injection mold -- that is to say, "positive pressure casting process ofmolten metal into the mold" in the cavity of the moment, mold

The internal pressure is greater than the mold of external pressure, the difference between the two is greater than 0, so called "positive pressure casting"; "negative pressure casting with vacuum suction casting" typical, in the casting process, the molten metal into the mold, the mold internal pressure is less than the mold of external pressure, the difference between the two values less than 0

, so called "negative pressure casting" -- of course, vacuum mold must be done through the vacuum pump is communicated with the liquid metal in the mold, under the action of atmospheric pressure into the mold.

From the actual production effect, positive pressure and negative pressure castingthe casting have no obvious difference, but in general, positive pressure casting is suitable for occasions with high yield, and negative pressure casting is suitable for medium or small output.

Vacuum centrifugal casting is a casting method combined with the advantages of positive pressure casting and pressure casting, by its nature, vacuum centrifugal casting is negative pressure casting. Although the "vacuum" does not only refer to the internal mold, molten metal and its container is in a vacuum state -- crucible

State, but in accordance with the above our definition of "negative pressure casting",in the casting process, casting internal pressure less than atmospheric pressure, so the "vacuum centrifugal casting" to "negative pressure casting" is a reasonable.

Vacuum pressure casting is a casting method combined with the positive and negative pressure casting advantages. The casting method "vacuum" position in the plaster mold side, and "pressure" on one side of the crucible for melting metal. According to the classification method we defined above, due to the casting method of this kind ofcasting

Mould (CAST) internal stress in the casting process is lower than the atmospheric pressure should therefore also belong to a class of "negative pressure casting".

Wax casting typically lose (lost wax casting) process. Lost wax casting is the result ofthe conversion mold die mold -- -- -- -- male and female die completed, that is to say,male after three conversion silver version -- wax -- finished blank. In this three transformation, production

Certain errors and deformation is inevitable. But the lost wax casting process can bereasonable to make these errors and deformation is reduced to a minimum.

Lost wax casting process is: pressing mold plastic mold -- -- wax injection (die) --dressing wax (welding for ash (wax) -- -- -- -- weighing) with gypsum gypsum plastercylinder vacuum -- natural coagulation -- baking gypsum -- gold melting, casting --fried gypsum

-- washing, pickling, cleaning (-- weighing) -- cutting blank (-- rolling light). The following are telling each process.

2 open mode

Plastic mold is a demanding technology in jewelry factory, because plastic moulddirectly affects the quality of wax and metal blank, but also directly affect the mold life.Skilled mold master out of the mold, the wax injection after basic no deformation,fracture, cloak

The phenomenon, no need to repair welding wax, wax, can save a lot of time to getdressed, high production efficiency.

Plastic mold used tool is simple, have the operation knife and blade, tweezers,scissors, pliers. Attention must use a new blade beginners operation knife, so it is not easy to scratch fingers. In order to ensure the lubrication between the blade and film plastic die cutting process, can be in

The blade is dipped with water or detergent (but don’t dip in oil, because the oil will make the rubber mold become hard, brittle). Rubber mold four positioning method is usually used, that is to say, rubber mold at four feet are fixed, the part between thelegs are straight line cutting, but also the use of curve

Cutting. The opening sequence (in a ring rubber mould as an example):

1) pressure off the rubber mold cooling to not hot, to flash cut with scissors, using pointed nose pliers take water outlet block, pull to coke shell.

2) the rubber mold gate up straight from the port side, under the knife edges