Where to order gold-plated jewelry rings

Where to order gold-plated jewelry rings-Jewelry Most of the jewelry in China are concentrated in Yiwu, Zhejiang and Guangzhou and Xiamen in Fujian. Everyone knows that Yiwu jewelry is famous for its low price, but the quality of the products is not so good. However, Xiamen Jewelry has focused on gold-plated jewelry for more than 13 years, with advanced technology and workshops, as well as a team. Gold-plated jewelry factory, 1000 square meter production workshop, 13 years of industry experience, the combination of automated production workshop and pure manual craftsmanship, the service is deeply loved by customer service. 1—Sand 2—Voids 3—Additions 4—The quality of clay film molding sand and core sand directly affects the quality of gold-plated jewelry castings. Poor quality of molding sand will cause pores, sand holes, sand sticking, sand inclusion and other defects in the casting. Good molding sand should have the following properties: 1) After the gas-permeable high-temperature molten metal is poured into the gold-plated jewelry mold, the mold is filled with a large amount of gas, and these gases are smoothly discharged from the mold. The performance is called breathability. Otherwise, the casting will have defects such as porosity and insufficient pouring. The air permeability of the mold is affected by factors such as the particle size of the sand, the clay content, the moisture content and the compactness of the sand mold. The finer the sand size, the higher the clay and moisture content, the higher the sand compactness, and the worse the air permeability. 2) Strength The ability of molding sand to resist external damage is called strength. The molding sand has high enough strength to not cause collapse in the process of modeling, handling, and closing, and it will not damage the surface of the mold during pouring. The strength of the molding sand should not be too high, otherwise it will cause defects in the gold-plated jewelry castings due to the decrease of air permeability and concession. 3) Fire resistance High temperature molten metal has strong heat effect on the mold of gold-plated jewelry, so the molding sand must have the ability to resist high temperature heat effect, that is, fire resistance. If the molding material has poor fire resistance, the casting is prone to sand sticking. The more SiO2 content in the molding sand, the larger the molding sand particles, and the better the fire resistance. 4) Plasticity refers to the ability of molding sand to deform under the action of external force, and to completely maintain the existing shape after the external force is removed. The plasticity of the modeling material is good, the modeling operation is convenient, and the formed sand mold has an accurate shape and a clear outline.