Progress in 1 wax injection device

Wax pattern making is one of the earlier process, its quality has an important impact on the jewelry, the widespread use of early is a simple pneumatic wax injectionmachine, wax quality is relatively difficult to guarantee, especially fine wax molding.The last century 80’s after the vacuum wax injection machine, injection of rubber

Mold vacuum, improves the wax liquid filling capacity. 90 years after the development of vacuum wax injector and a high degree of automation, digital type vacuum wax injection system such as Japan Yasui company. It uses two times of wax injectionsystem enables the wax mold shrinkage reduced to a minimum, an injection pressure

The two time, injection pressure, injection pressure of two times the start time, the clamping pressure, holding time, compression pressure wax injection parameter can be any combination of settings, to wax injection is most suitable for settingparameters. The rubber mold into the mold clamping manipulator, input the program number, press the start button, i.e.

Can; and then clamping, forward, automatic alignment wax injection port, vacuum pumping, a wax injection, two injection wax, wax solidification remain, clampingopening action is finished automatically. Accurate temperature control, wax injectioneffect is perfect. In addition, the wax injection mould with all the rubber mold, generalwax pattern

There must be a certain thickness, the beginning of the last few years the metal moldin the part of the structure, the wax produced by it is very thin, almost transparent,and the stability of wax weight, size is very good, it is of significance to batch has the advantages of simple structure parts.

2 open powder equipment developments

Simple mixing of powder machine widely used in powder stirring process to make slurry into gas, have an impact on the performance of plaster mould. The last century 90’s after the automatic vacuum powder stirring machine, which is composed of astirring performance of powder machine production in Italy is better, it sets the mixers and vacuum sealing device

A body, can start from stirring casting powder the entire process until the groutingmolding are in the vacuum state, and effectively reduce the bubbles, the roughnessand better products. Vacuum powder stirring machine equipped with quantitativewater, stirring time, stirring speed setting set function

To improve the automation level, open powder. Compared with the simple powder stirring machine, eliminating the powder stirring, vacuum, filling, vacuum, complexoperation, the operation is simple and time-saving.

The advances of the 3 roasting furnace

Jewelry industry gypsum calcination furnace used mostly by resistance furnace,generally adopts three heating, not uniform temperature distribution in furnace,roasting time is not easy to adjust the furnace atmosphere. Around the furnace temperature distribution is uniform, eliminate the wax residue, automation control target, constantly in recent years

Some advanced roasting furnace, such as Italy’s Schultheiss company developed anew type of furnace, it added a heat-resistant steel in the heating element and theplaster, top mounted fan, forced air flows through the heating element, and from the bottom of the furnace to return, forced air flow in the furnace

Still, in addition to the stove also improves the insulation performance of the furnace shell. Moreover Germany developed a more advanced furnace hearth, it adoptsrotary mode, the plaster mold can be heated uniformly, gypsum wall smooth fine,especially for advanced wax setting and casting process, many countries are inproduction

This stove.

Progress on 4 casting machine

The piece of jewelry is fine products, casting process quickly solidified and the loss ofliquidity, so gravity casting routine is difficult to ensure the forming, we must introducesome external force, the liquid metal fast filling cavity, obtain complete shape, contourclear casting. Therefore

, casting machine is very important equipment in the lost wax casting jewelry, is an important guarantee of product quality. According to the use of external form,commonly used for jewelry casting machine, casting machine are mainly two types ofcentrifugal casting machine and static pressure.

(1) the centrifugal casting machine

It uses the centrifugal force generated by high-speed rotation of the liquid metal into the cavity, filling speed, more favorable for forming small workpieces with complex,casting for gold, silver alloy; the platinum, as in the liquid state time is very short, withcentrifugal casting is more suitable for the

. At present, some small factories still use a mechanical drive type centrifuge is simple,it does not come with induction heating device, using oxygen acetylene to melt themetal, metallurgy quality is not guaranteed. Great progress has been made in moderncentrifugal casting machine, set in an induction heating and centrifugal casting

Body, and is suitable for casting gold, silver, copper, alloy. Compared with staticcasting, casting metal liquid with severe turbulence, is easy to appear the maximumamount of metal hole, metal liquid to the wall with severe erosion, casting defects such as relatively less centrifugal casting. Aiming at these problems, the modern centrifugalcasting

The machine has made great progress in drive technology and programming, its development goal is to improve programming ability and process automation. For example, mold center shaft and rotating arm angle design variable, it as a function ofspeed, can vary from 90o to 0o, this comprehensive consideration

The centrifugal force and tangential inertial force in driving metal liquid flows into thecrucible and casting, the device will help to improve the metal flow balance, preventing the molten metal preferentially along the runner wall reverse rotation direction flow. Inthe bottom of the casting mold with a suction device, gas convenient cavity smoothly

Discharge, improve the filling ability. And equipped with a temperature measuring device, reduce human error in judgement.

(2) static casting machine

It uses vacuum suction casting, vacuum pressure and so on, the liquid metal filling cavity, compared with centrifugal casting, static casting machine is relatively smooth,scour the small metal liquid to the wall, because the function of vacuum pumping, gascavity smaller anti pressure. A casting

The maximum amount of metal is more, so the static casting machine has been used more and more widely. Types of static casting machine has many kinds, the mostsimple static casting machine is blister machine, the main components of this machineis a device with no vacuum system, heating and melting, therefore needs and welding

With the use of guns or melt furnace. Because it is cast in the atmosphere, the liquid metal has two oxidation breathing problems, the whole casting process is controlled by operator, such as pouring temperature, casting speed, pressure head height, liquidslag processing, so the human factors affecting the quality of a

Many. Modern static casting machine, induction heating, vacuum system, control system is equal to one, the upright in the structure, the upper induction meltingchamber, the lower chamber for vacuum casting. The bottom gating mode, with a holeat the bottom of the crucible, melting refractory plunger rod plug

When pouring, filed a plug rod, the liquid metal is poured into the cavity. In general,the plunger rod is provided with temperature, it can more accurately reflect the liquid metal temperature, there will be a thermocouple placed in the crucible walltemperature measurement, but the measuring temperature does not reflect the liquid metal temperature directly,

Only as a reference.