Jewelry equipment investment casting is also known as the precision casting, itshistory is very long. Investment casting process has experienced two main development stages, was 1935 the Canadian Jungersen invented the elastic rubbermodel; two is in the middle of twentieth Century (1940~1950 years), the long-term use of dental casting method in the industry successfully used in jewelry production. Since then, casting jewelry grew in popularity, the technology has become the main method of modern jewelry manufacturing technology, there are about 70% Au, Pt, Ag jewelryproducts using investment casting technology. Some advanced countries and regions in the world, such as Italy, Germany, Japan and Hongkong, USA China, castingtechnology in-depth, comprehensive study on jewelry casting, casting equipment, in the production process, the original (DES) material has made significant progress in.
Jewelry casting involve many equipments, mainly by the wax injection equipment,powder equipment and casting machine.
A, wax injection device
Wax injection device mainly comprises a vacuum wax injection machine and pneumaticwax injection machine, using air pump pressure, make the wax liquid filling rubbermold cavity. Lost wax casting production is an important working procedure in the wax,the quality has an important impact on the jewelry products. The widespread use ofearly is a simple pneumatic wax injection machine, wax quality is relatively difficult to guarantee, especially fine wax to forming. In twentieth Century 80 years after thevacuum wax injection machine, injection wax before evacuating the rubber mold, thewax is in a vacuum state betting wax, the filling performance is optimized, therefore,can obtain relatively thin wax pattern, improve the filling ability of wax. 90 years after the development of vacuum wax injector higher degree of automation, such as digitalvacuum wax injection system produced by Yasui company in Japan, with two wax injection system to minimize the shrinkage of wax, wax injection parameter can be any combination of. The rubber mold into the mold clamping manipulator, input the program, press the "start" button, it can automatically complete the whole process.The device to control the temperature, wax injection effect is perfect.
Wax injection mold of previous to the rubber mold, has the certain thickness requirements. In recent years, the metal film on the part of the structure, making wax pattern is very thin, almost transparent, stability and the weight, size is very good,suitable for batch piece structure simple.
Two, open the powder equipment
Simple is easy to make slurry mixer is widely used in gas, the powder process to go through multi-channel processes, complex. 90 years after the vacuum automaticpowder stirring machine, it sets the mixers and vacuum sealing device in a body, can complete the whole process from stirring casting powder to filling forming under vacuum state, effectively reduce the bubble, the smoothness and better products.Vacuum powder stirring machine generally has a quantitative water and stirring timeand speed setting function, improve the degree of Automation Open powder, simple operation, time saving.
Three, baking furnace
Jewelry industry gypsum calcination furnace used mostly by resistance furnace, is generally three surface heating, uneven temperature distribution in the furnace,roasting time is not easy to adjust the furnace atmosphere. In order to achieveuniform distribution of wax residue and automation control, eliminate the target temperature furnace, in recent years the continuous development of some advancedroasting furnace. For example, Italy’s Schultheiss company developed a new type offurnace, heat resistant steel is arranged in the heating element and plaster, fan is installed on the roof, forced air flows through the heating element and returns from the bottom of furnace, which forced air flow in the furnace, improves the thermal insulation of the furnace shell can. Germany developed a roasting furnace more advanced, the hearth rotary mode, the plaster is heated evenly, smooth, fine plaster,particularly in the advanced wax casting process requirements. The furnace boxsurrounded by heating, there are double brick partition, temperature uniformity and stability, good insulation performance, after two times after the full combustion,exhaust gas is pollution-free, have a negative impact on the environment will not. At present, many countries in the production of such a roasting furnace.